diff --git a/talk/app/webrtc/peerconnection.cc b/talk/app/webrtc/peerconnection.cc
index 6d3417a..c91b7c8 100644
--- a/talk/app/webrtc/peerconnection.cc
+++ b/talk/app/webrtc/peerconnection.cc
@@ -235,17 +235,6 @@
     return false;
   }
 
-  bool audio_track_exist = false;
-  for (size_t j = 0; j < current_streams->count(); ++j) {
-    if (!audio_track_exist) {
-      audio_track_exist = current_streams->at(j)->GetAudioTracks().size() > 0;
-    }
-  }
-  if (audio_track_exist && (new_stream->GetAudioTracks().size() > 0)) {
-    LOG(LS_ERROR) << "AddStream - Currently only one audio track is supported"
-                  << "per PeerConnection.";
-    return false;
-  }
   return true;
 }
 
diff --git a/talk/app/webrtc/peerconnectioninterface_unittest.cc b/talk/app/webrtc/peerconnectioninterface_unittest.cc
index 698de3e..d743684 100644
--- a/talk/app/webrtc/peerconnectioninterface_unittest.cc
+++ b/talk/app/webrtc/peerconnectioninterface_unittest.cc
@@ -551,20 +551,27 @@
   AddVoiceStream(kStreamLabel2);
   ASSERT_EQ(2u, pc_->local_streams()->count());
 
-  // Fail to add another stream with audio since we already have an audio track.
+  // Test we can add multiple local streams to one peerconnection.
   scoped_refptr<MediaStreamInterface> stream(
       pc_factory_->CreateLocalMediaStream(kStreamLabel3));
   scoped_refptr<AudioTrackInterface> audio_track(
       pc_factory_->CreateAudioTrack(
           kStreamLabel3, static_cast<AudioSourceInterface*>(NULL)));
   stream->AddTrack(audio_track.get());
-  EXPECT_FALSE(pc_->AddStream(stream, NULL));
-
-  // Remove the stream with the audio track.
-  pc_->RemoveStream(pc_->local_streams()->at(1));
-
-  // Test that we now can add the stream with the audio track.
   EXPECT_TRUE(pc_->AddStream(stream, NULL));
+  EXPECT_EQ(3u, pc_->local_streams()->count());
+
+  // Remove the third stream.
+  pc_->RemoveStream(pc_->local_streams()->at(2));
+  EXPECT_EQ(2u, pc_->local_streams()->count());
+
+  // Remove the second stream.
+  pc_->RemoveStream(pc_->local_streams()->at(1));
+  EXPECT_EQ(1u, pc_->local_streams()->count());
+
+  // Remove the first stream.
+  pc_->RemoveStream(pc_->local_streams()->at(0));
+  EXPECT_EQ(0u, pc_->local_streams()->count());
 }
 
 TEST_F(PeerConnectionInterfaceTest, RemoveStream) {
diff --git a/talk/libjingle.gyp b/talk/libjingle.gyp
index 8317150..f74ddc1 100755
--- a/talk/libjingle.gyp
+++ b/talk/libjingle.gyp
@@ -835,6 +835,8 @@
         'media/webrtc/webrtcmediaengine.h',
         'media/webrtc/webrtcpassthroughrender.cc',
         'media/webrtc/webrtcpassthroughrender.h',
+        'media/webrtc/webrtctexturevideoframe.cc',
+        'media/webrtc/webrtctexturevideoframe.h',
         'media/webrtc/webrtcvideocapturer.cc',
         'media/webrtc/webrtcvideocapturer.h',
         'media/webrtc/webrtcvideodecoderfactory.h',
diff --git a/talk/libjingle_tests.gyp b/talk/libjingle_tests.gyp
index 9ec8ca3..9d57503 100755
--- a/talk/libjingle_tests.gyp
+++ b/talk/libjingle_tests.gyp
@@ -402,7 +402,7 @@
     },  # target libjingle_peerconnection_unittest
   ],
   'conditions': [
-    ['OS=="linux" or OS=="android"', {
+    ['OS=="linux"', {
       'targets': [
         {
           'target_name': 'libjingle_peerconnection_test_jar',
diff --git a/talk/media/base/nullvideoframe.h b/talk/media/base/nullvideoframe.h
index ff29129..26741ad 100644
--- a/talk/media/base/nullvideoframe.h
+++ b/talk/media/base/nullvideoframe.h
@@ -57,6 +57,7 @@
   virtual int32 GetYPitch() const { return 0; }
   virtual int32 GetUPitch() const { return 0; }
   virtual int32 GetVPitch() const { return 0; }
+  virtual void* GetNativeHandle() const { return NULL; }
 
   virtual size_t GetPixelWidth() const { return 1; }
   virtual size_t GetPixelHeight() const { return 1; }
diff --git a/talk/media/base/videoframe.h b/talk/media/base/videoframe.h
index 2f641ff..fe5ff01 100644
--- a/talk/media/base/videoframe.h
+++ b/talk/media/base/videoframe.h
@@ -66,16 +66,23 @@
   size_t GetChromaWidth() const { return (GetWidth() + 1) / 2; }
   size_t GetChromaHeight() const { return (GetHeight() + 1) / 2; }
   size_t GetChromaSize() const { return GetUPitch() * GetChromaHeight(); }
+  // These can return NULL if the object is not backed by a buffer.
   virtual const uint8 *GetYPlane() const = 0;
   virtual const uint8 *GetUPlane() const = 0;
   virtual const uint8 *GetVPlane() const = 0;
   virtual uint8 *GetYPlane() = 0;
   virtual uint8 *GetUPlane() = 0;
   virtual uint8 *GetVPlane() = 0;
+
   virtual int32 GetYPitch() const = 0;
   virtual int32 GetUPitch() const = 0;
   virtual int32 GetVPitch() const = 0;
 
+  // Returns the handle of the underlying video frame. This is used when the
+  // frame is backed by a texture. The object should be destroyed when it is no
+  // longer in use, so the underlying resource can be freed.
+  virtual void* GetNativeHandle() const = 0;
+
   // For retrieving the aspect ratio of each pixel. Usually this is 1x1, but
   // the aspect_ratio_idc parameter of H.264 can specify non-square pixels.
   virtual size_t GetPixelWidth() const = 0;
@@ -165,7 +172,7 @@
                               bool crop) const;
 
   // Sets the video frame to black.
-  bool SetToBlack();
+  virtual bool SetToBlack();
 
   // Tests if sample is valid.  Returns true if valid.
   static bool Validate(uint32 fourcc, int w, int h, const uint8 *sample,
diff --git a/talk/media/webrtc/fakewebrtcvideoengine.h b/talk/media/webrtc/fakewebrtcvideoengine.h
index 1c406ec..df53904 100644
--- a/talk/media/webrtc/fakewebrtcvideoengine.h
+++ b/talk/media/webrtc/fakewebrtcvideoengine.h
@@ -597,10 +597,8 @@
     channels_.erase(channel);
     return 0;
   }
-#ifdef USE_WEBRTC_DEV_BRANCH
   WEBRTC_STUB(RegisterCpuOveruseObserver,
       (int channel, webrtc::CpuOveruseObserver* observer));
-#endif
   WEBRTC_STUB(ConnectAudioChannel, (const int, const int));
   WEBRTC_STUB(DisconnectAudioChannel, (const int));
   WEBRTC_FUNC(StartSend, (const int channel)) {
diff --git a/talk/media/webrtc/fakewebrtcvoiceengine.h b/talk/media/webrtc/fakewebrtcvoiceengine.h
index 7202e15..3a8cfb3 100644
--- a/talk/media/webrtc/fakewebrtcvoiceengine.h
+++ b/talk/media/webrtc/fakewebrtcvoiceengine.h
@@ -161,6 +161,14 @@
   }
   bool IsInited() const { return inited_; }
   int GetLastChannel() const { return last_channel_; }
+  int GetChannelFromLocalSsrc(uint32 local_ssrc) const {
+    for (std::map<int, Channel*>::const_iterator iter = channels_.begin();
+         iter != channels_.end(); ++iter) {
+      if (local_ssrc == iter->second->send_ssrc)
+        return iter->first;
+    }
+    return -1;
+  }
   int GetNumChannels() const { return channels_.size(); }
   bool GetPlayout(int channel) {
     return channels_[channel]->playout;
diff --git a/talk/media/webrtc/webrtctexturevideoframe.cc b/talk/media/webrtc/webrtctexturevideoframe.cc
new file mode 100644
index 0000000..08f63a5
--- /dev/null
+++ b/talk/media/webrtc/webrtctexturevideoframe.cc
@@ -0,0 +1,183 @@
+/*
+ * libjingle
+ * Copyright 2013 Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright notice,
+ *     this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *  3. The name of the author may not be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "talk/media/webrtc/webrtctexturevideoframe.h"
+
+#include "talk/base/common.h"
+#include "talk/base/logging.h"
+#include "talk/base/stream.h"
+
+#define UNIMPLEMENTED \
+  LOG(LS_ERROR) << "Call to unimplemented function "<< __FUNCTION__; \
+  ASSERT(false)
+
+namespace cricket {
+
+WebRtcTextureVideoFrame::WebRtcTextureVideoFrame(
+    webrtc::NativeHandle* handle, int width, int height, int64 elapsed_time,
+    int64 time_stamp)
+    : handle_(handle), width_(width), height_(height),
+      elapsed_time_(elapsed_time), time_stamp_(time_stamp) {}
+
+WebRtcTextureVideoFrame::~WebRtcTextureVideoFrame() {}
+
+bool WebRtcTextureVideoFrame::InitToBlack(
+    int w, int h, size_t pixel_width, size_t pixel_height, int64 elapsed_time,
+    int64 time_stamp) {
+  UNIMPLEMENTED;
+  return false;
+}
+
+bool WebRtcTextureVideoFrame::Reset(
+    uint32 fourcc, int w, int h, int dw, int dh, uint8* sample,
+    size_t sample_size, size_t pixel_width, size_t pixel_height,
+    int64 elapsed_time, int64 time_stamp, int rotation) {
+  UNIMPLEMENTED;
+  return false;
+}
+
+const uint8* WebRtcTextureVideoFrame::GetYPlane() const {
+  UNIMPLEMENTED;
+  return NULL;
+}
+
+const uint8* WebRtcTextureVideoFrame::GetUPlane() const {
+  UNIMPLEMENTED;
+  return NULL;
+}
+
+const uint8* WebRtcTextureVideoFrame::GetVPlane() const {
+  UNIMPLEMENTED;
+  return NULL;
+}
+
+uint8* WebRtcTextureVideoFrame::GetYPlane() {
+  UNIMPLEMENTED;
+  return NULL;
+}
+
+uint8* WebRtcTextureVideoFrame::GetUPlane() {
+  UNIMPLEMENTED;
+  return NULL;
+}
+
+uint8* WebRtcTextureVideoFrame::GetVPlane() {
+  UNIMPLEMENTED;
+  return NULL;
+}
+
+int32 WebRtcTextureVideoFrame::GetYPitch() const {
+  UNIMPLEMENTED;
+  return width_;
+}
+
+int32 WebRtcTextureVideoFrame::GetUPitch() const {
+  UNIMPLEMENTED;
+  return (width_ + 1) / 2;
+}
+
+int32 WebRtcTextureVideoFrame::GetVPitch() const {
+  UNIMPLEMENTED;
+  return (width_ + 1) / 2;
+}
+
+VideoFrame* WebRtcTextureVideoFrame::Copy() const {
+  return new WebRtcTextureVideoFrame(
+      handle_, width_, height_, elapsed_time_, time_stamp_);
+}
+
+bool WebRtcTextureVideoFrame::MakeExclusive() {
+  UNIMPLEMENTED;
+  return false;
+}
+
+size_t WebRtcTextureVideoFrame::CopyToBuffer(uint8* buffer, size_t size) const {
+  UNIMPLEMENTED;
+  return 0;
+}
+
+size_t WebRtcTextureVideoFrame::ConvertToRgbBuffer(
+    uint32 to_fourcc, uint8* buffer, size_t size, int stride_rgb) const {
+  UNIMPLEMENTED;
+  return 0;
+}
+
+bool WebRtcTextureVideoFrame::CopyToPlanes(
+    uint8* dst_y, uint8* dst_u, uint8* dst_v, int32 dst_pitch_y,
+    int32 dst_pitch_u, int32 dst_pitch_v) const {
+  UNIMPLEMENTED;
+  return false;
+}
+
+void WebRtcTextureVideoFrame::CopyToFrame(VideoFrame* dst) const {
+  UNIMPLEMENTED;
+}
+
+talk_base::StreamResult WebRtcTextureVideoFrame::Write(
+    talk_base::StreamInterface* stream, int* error) {
+  UNIMPLEMENTED;
+  return talk_base::SR_ERROR;
+}
+void WebRtcTextureVideoFrame::StretchToPlanes(
+    uint8* dst_y, uint8* dst_u, uint8* dst_v, int32 dst_pitch_y,
+    int32 dst_pitch_u, int32 dst_pitch_v, size_t width, size_t height,
+    bool interpolate, bool vert_crop) const {
+  UNIMPLEMENTED;
+}
+
+size_t WebRtcTextureVideoFrame::StretchToBuffer(
+    size_t dst_width, size_t dst_height, uint8* dst_buffer, size_t size,
+    bool interpolate, bool vert_crop) const {
+  UNIMPLEMENTED;
+  return 0;
+}
+
+void WebRtcTextureVideoFrame::StretchToFrame(
+    VideoFrame* dst, bool interpolate, bool vert_crop) const {
+  UNIMPLEMENTED;
+}
+
+VideoFrame* WebRtcTextureVideoFrame::Stretch(
+    size_t dst_width, size_t dst_height, bool interpolate,
+    bool vert_crop) const {
+  UNIMPLEMENTED;
+  return NULL;
+}
+
+bool WebRtcTextureVideoFrame::SetToBlack() {
+  UNIMPLEMENTED;
+  return false;
+}
+
+VideoFrame* WebRtcTextureVideoFrame::CreateEmptyFrame(
+    int w, int h, size_t pixel_width, size_t pixel_height, int64 elapsed_time,
+    int64 time_stamp) const {
+  UNIMPLEMENTED;
+  return NULL;
+}
+
+}  // namespace cricket
diff --git a/talk/media/webrtc/webrtctexturevideoframe.h b/talk/media/webrtc/webrtctexturevideoframe.h
new file mode 100644
index 0000000..05b50f7
--- /dev/null
+++ b/talk/media/webrtc/webrtctexturevideoframe.h
@@ -0,0 +1,120 @@
+/*
+ * libjingle
+ * Copyright 2013 Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright notice,
+ *     this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *  3. The name of the author may not be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef TALK_MEDIA_WEBRTC_WEBRTCTEXTUREVIDEOFRAME_H_
+#define TALK_MEDIA_WEBRTC_WEBRTCTEXTUREVIDEOFRAME_H_
+
+#include "talk/base/refcount.h"
+#include "talk/base/scoped_ref_ptr.h"
+#include "talk/media/base/videoframe.h"
+#ifdef USE_WEBRTC_DEV_BRANCH
+#include "webrtc/common_video/interface/native_handle.h"
+#else
+#include "webrtc/common_video/interface/i420_video_frame.h"
+// Define NativeHandle to an existing type so we don't need to add lots of
+// USE_WEBRTC_DEV_BRANCH.
+#define NativeHandle I420VideoFrame
+#endif
+
+namespace cricket {
+
+// A video frame backed by the texture via a native handle.
+class WebRtcTextureVideoFrame : public VideoFrame {
+ public:
+  WebRtcTextureVideoFrame(webrtc::NativeHandle* handle, int width, int height,
+                          int64 elapsed_time, int64 time_stamp);
+  virtual ~WebRtcTextureVideoFrame();
+
+  // From base class VideoFrame.
+  virtual bool InitToBlack(int w, int h, size_t pixel_width,
+                           size_t pixel_height, int64 elapsed_time,
+                           int64 time_stamp);
+  virtual bool Reset(uint32 fourcc, int w, int h, int dw, int dh, uint8* sample,
+                     size_t sample_size, size_t pixel_width,
+                     size_t pixel_height, int64 elapsed_time, int64 time_stamp,
+                     int rotation);
+  virtual size_t GetWidth() const { return width_; }
+  virtual size_t GetHeight() const { return height_; }
+  virtual const uint8* GetYPlane() const;
+  virtual const uint8* GetUPlane() const;
+  virtual const uint8* GetVPlane() const;
+  virtual uint8* GetYPlane();
+  virtual uint8* GetUPlane();
+  virtual uint8* GetVPlane();
+  virtual int32 GetYPitch() const;
+  virtual int32 GetUPitch() const;
+  virtual int32 GetVPitch() const;
+  virtual size_t GetPixelWidth() const { return 1; }
+  virtual size_t GetPixelHeight() const { return 1; }
+  virtual int64 GetElapsedTime() const { return elapsed_time_; }
+  virtual int64 GetTimeStamp() const { return time_stamp_; }
+  virtual void SetElapsedTime(int64 elapsed_time) {
+    elapsed_time_ = elapsed_time;
+  }
+  virtual void SetTimeStamp(int64 time_stamp) { time_stamp_ = time_stamp; }
+  virtual int GetRotation() const { return 0; }
+  virtual VideoFrame* Copy() const;
+  virtual bool MakeExclusive();
+  virtual size_t CopyToBuffer(uint8* buffer, size_t size) const;
+  virtual size_t ConvertToRgbBuffer(uint32 to_fourcc, uint8* buffer,
+                                    size_t size, int stride_rgb) const;
+  virtual void* GetNativeHandle() const { return handle_.get(); }
+
+  virtual bool CopyToPlanes(
+      uint8* dst_y, uint8* dst_u, uint8* dst_v,
+      int32 dst_pitch_y, int32 dst_pitch_u, int32 dst_pitch_v) const;
+  virtual void CopyToFrame(VideoFrame* target) const;
+  virtual talk_base::StreamResult Write(talk_base::StreamInterface* stream,
+                                        int* error);
+  virtual void StretchToPlanes(
+      uint8* y, uint8* u, uint8* v, int32 pitchY, int32 pitchU, int32 pitchV,
+      size_t width, size_t height, bool interpolate, bool crop) const;
+  virtual size_t StretchToBuffer(size_t w, size_t h, uint8* buffer, size_t size,
+                                 bool interpolate, bool crop) const;
+  virtual void StretchToFrame(VideoFrame* target, bool interpolate,
+                              bool crop) const;
+  virtual VideoFrame* Stretch(size_t w, size_t h, bool interpolate,
+                              bool crop) const;
+  virtual bool SetToBlack();
+
+ protected:
+  virtual VideoFrame* CreateEmptyFrame(int w, int h, size_t pixel_width,
+                                       size_t pixel_height, int64 elapsed_time,
+                                       int64 time_stamp) const;
+
+ private:
+  // The handle of the underlying video frame.
+  talk_base::scoped_refptr<webrtc::NativeHandle> handle_;
+  int width_;
+  int height_;
+  int64 elapsed_time_;
+  int64 time_stamp_;
+};
+
+}  // namespace cricket
+
+#endif  // TALK_MEDIA_WEBRTC_WEBRTCTEXTUREVIDEOFRAME_H_
diff --git a/talk/media/webrtc/webrtctexturevideoframe_unittest.cc b/talk/media/webrtc/webrtctexturevideoframe_unittest.cc
new file mode 100644
index 0000000..9ac16da
--- /dev/null
+++ b/talk/media/webrtc/webrtctexturevideoframe_unittest.cc
@@ -0,0 +1,84 @@
+/*
+ * libjingle
+ * Copyright 2013 Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright notice,
+ *     this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *  3. The name of the author may not be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "talk/media/webrtc/webrtctexturevideoframe.h"
+
+#include "talk/base/gunit.h"
+#include "talk/media/base/videocommon.h"
+
+class NativeHandleImpl : public webrtc::NativeHandle {
+ public:
+  NativeHandleImpl() : ref_count_(0) {}
+  virtual ~NativeHandleImpl() {}
+  virtual int32_t AddRef() { return ++ref_count_; }
+  virtual int32_t Release() { return --ref_count_; }
+  virtual void* GetHandle() { return NULL; }
+
+  int32_t ref_count() { return ref_count_; }
+ private:
+  int32_t ref_count_;
+};
+
+TEST(WebRtcTextureVideoFrameTest, InitialValues) {
+  NativeHandleImpl handle;
+  cricket::WebRtcTextureVideoFrame frame(&handle, 640, 480, 100, 200);
+  EXPECT_EQ(&handle, frame.GetNativeHandle());
+  EXPECT_EQ(640u, frame.GetWidth());
+  EXPECT_EQ(480u, frame.GetHeight());
+  EXPECT_EQ(100, frame.GetElapsedTime());
+  EXPECT_EQ(200, frame.GetTimeStamp());
+  frame.SetElapsedTime(300);
+  EXPECT_EQ(300, frame.GetElapsedTime());
+  frame.SetTimeStamp(400);
+  EXPECT_EQ(400, frame.GetTimeStamp());
+}
+
+TEST(WebRtcTextureVideoFrameTest, CopyFrame) {
+  NativeHandleImpl handle;
+  cricket::WebRtcTextureVideoFrame frame1(&handle, 640, 480, 100, 200);
+  cricket::VideoFrame* frame2 = frame1.Copy();
+  EXPECT_EQ(frame1.GetNativeHandle(), frame2->GetNativeHandle());
+  EXPECT_EQ(frame1.GetWidth(), frame2->GetWidth());
+  EXPECT_EQ(frame1.GetHeight(), frame2->GetHeight());
+  EXPECT_EQ(frame1.GetElapsedTime(), frame2->GetElapsedTime());
+  EXPECT_EQ(frame1.GetTimeStamp(), frame2->GetTimeStamp());
+  delete frame2;
+}
+
+TEST(WebRtcTextureVideoFrameTest, RefCount) {
+  NativeHandleImpl handle;
+  EXPECT_EQ(0, handle.ref_count());
+  cricket::WebRtcTextureVideoFrame* frame1 =
+      new cricket::WebRtcTextureVideoFrame(&handle, 640, 480, 100, 200);
+  EXPECT_EQ(1, handle.ref_count());
+  cricket::VideoFrame* frame2 = frame1->Copy();
+  EXPECT_EQ(2, handle.ref_count());
+  delete frame2;
+  EXPECT_EQ(1, handle.ref_count());
+  delete frame1;
+  EXPECT_EQ(0, handle.ref_count());
+}
diff --git a/talk/media/webrtc/webrtcvideoengine.cc b/talk/media/webrtc/webrtcvideoengine.cc
index 10cdd8e..873b249 100644
--- a/talk/media/webrtc/webrtcvideoengine.cc
+++ b/talk/media/webrtc/webrtcvideoengine.cc
@@ -51,10 +51,11 @@
 #include "talk/media/base/videocapturer.h"
 #include "talk/media/base/videorenderer.h"
 #include "talk/media/devices/filevideocapturer.h"
+#include "talk/media/webrtc/webrtcpassthroughrender.h"
+#include "talk/media/webrtc/webrtctexturevideoframe.h"
+#include "talk/media/webrtc/webrtcvideocapturer.h"
 #include "talk/media/webrtc/webrtcvideodecoderfactory.h"
 #include "talk/media/webrtc/webrtcvideoencoderfactory.h"
-#include "talk/media/webrtc/webrtcpassthroughrender.h"
-#include "talk/media/webrtc/webrtcvideocapturer.h"
 #include "talk/media/webrtc/webrtcvideoframe.h"
 #include "talk/media/webrtc/webrtcvie.h"
 #include "talk/media/webrtc/webrtcvoe.h"
@@ -176,12 +177,15 @@
   explicit WebRtcRenderAdapter(VideoRenderer* renderer)
       : renderer_(renderer), width_(0), height_(0), watermark_enabled_(false) {
   }
+
   virtual ~WebRtcRenderAdapter() {
   }
+
   void set_watermark_enabled(bool enable) {
     talk_base::CritScope cs(&crit_);
     watermark_enabled_ = enable;
   }
+
   void SetRenderer(VideoRenderer* renderer) {
     talk_base::CritScope cs(&crit_);
     renderer_ = renderer;
@@ -198,6 +202,7 @@
       }
     }
   }
+
   // Implementation of webrtc::ExternalRenderer.
   virtual int FrameSizeChange(unsigned int width, unsigned int height,
                               unsigned int /*number_of_streams*/) {
@@ -213,14 +218,18 @@
     }
     return renderer_->SetSize(width_, height_, 0) ? 0 : -1;
   }
+
   virtual int DeliverFrame(unsigned char* buffer, int buffer_size,
-                           uint32_t time_stamp, int64_t render_time) {
+                           uint32_t time_stamp, int64_t render_time
+#ifdef USE_WEBRTC_DEV_BRANCH
+                           , void* handle
+#endif
+                          ) {
     talk_base::CritScope cs(&crit_);
     frame_rate_tracker_.Update(1);
     if (renderer_ == NULL) {
       return 0;
     }
-    WebRtcVideoFrame video_frame;
     // Convert 90K rtp timestamp to ns timestamp.
     int64 rtp_time_stamp_in_ns = (time_stamp / 90) *
         talk_base::kNumNanosecsPerMillisec;
@@ -229,9 +238,26 @@
         talk_base::kNumNanosecsPerMillisec;
     // Send the rtp timestamp to renderer as the VideoFrame timestamp.
     // and the render timestamp as the VideoFrame elapsed_time.
+#ifdef USE_WEBRTC_DEV_BRANCH
+    if (handle == NULL) {
+#endif
+      return DeliverBufferFrame(buffer, buffer_size, render_time_stamp_in_ns,
+                                rtp_time_stamp_in_ns);
+#ifdef USE_WEBRTC_DEV_BRANCH
+    } else {
+      return DeliverTextureFrame(handle, render_time_stamp_in_ns,
+                                 rtp_time_stamp_in_ns);
+    }
+#endif
+  }
+
+  virtual bool IsTextureSupported() { return true; }
+
+  int DeliverBufferFrame(unsigned char* buffer, int buffer_size,
+                         int64 elapsed_time, int64 time_stamp) {
+    WebRtcVideoFrame video_frame;
     video_frame.Attach(buffer, buffer_size, width_, height_,
-                       1, 1, render_time_stamp_in_ns,
-                       rtp_time_stamp_in_ns, 0);
+                       1, 1, elapsed_time, time_stamp, 0);
 
 
     // Sanity check on decoded frame size.
@@ -247,18 +273,28 @@
     return ret;
   }
 
+  int DeliverTextureFrame(void* handle, int64 elapsed_time, int64 time_stamp) {
+    WebRtcTextureVideoFrame video_frame(
+        static_cast<webrtc::NativeHandle*>(handle), width_, height_,
+        elapsed_time, time_stamp);
+    return renderer_->RenderFrame(&video_frame);
+  }
+
   unsigned int width() {
     talk_base::CritScope cs(&crit_);
     return width_;
   }
+
   unsigned int height() {
     talk_base::CritScope cs(&crit_);
     return height_;
   }
+
   int framerate() {
     talk_base::CritScope cs(&crit_);
     return static_cast<int>(frame_rate_tracker_.units_second());
   }
+
   VideoRenderer* renderer() {
     talk_base::CritScope cs(&crit_);
     return renderer_;
diff --git a/talk/media/webrtc/webrtcvideoframe.h b/talk/media/webrtc/webrtcvideoframe.h
index 03a3196..18475a6 100644
--- a/talk/media/webrtc/webrtcvideoframe.h
+++ b/talk/media/webrtc/webrtcvideoframe.h
@@ -106,6 +106,7 @@
   virtual int32 GetYPitch() const { return frame()->Width(); }
   virtual int32 GetUPitch() const { return (frame()->Width() + 1) / 2; }
   virtual int32 GetVPitch() const { return (frame()->Width() + 1) / 2; }
+  virtual void* GetNativeHandle() const { return NULL; }
 
   virtual size_t GetPixelWidth() const { return pixel_width_; }
   virtual size_t GetPixelHeight() const { return pixel_height_; }
diff --git a/talk/media/webrtc/webrtcvoiceengine.cc b/talk/media/webrtc/webrtcvoiceengine.cc
index a974d0e..855a9e4 100644
--- a/talk/media/webrtc/webrtcvoiceengine.cc
+++ b/talk/media/webrtc/webrtcvoiceengine.cc
@@ -548,6 +548,12 @@
   }
 #endif
 
+  // Disable the DTMF playout when a tone is sent.
+  // PlayDtmfTone will be used if local playout is needed.
+  if (voe_wrapper_->dtmf()->SetDtmfFeedbackStatus(false) == -1) {
+    LOG_RTCERR1(SetDtmfFeedbackStatus, false);
+  }
+
   initialized_ = true;
   return true;
 }
@@ -675,6 +681,7 @@
   options.experimental_aec.Set(false);
 #endif
 
+
   LOG(LS_INFO) << "Applying audio options: " << options.ToString();
 
   webrtc::VoEAudioProcessing* voep = voe_wrapper_->processing();
@@ -1490,41 +1497,22 @@
       playout_(false),
       desired_send_(SEND_NOTHING),
       send_(SEND_NOTHING),
-      send_ssrc_(0),
-      local_renderer_(NULL),
       default_receive_ssrc_(0) {
   engine->RegisterChannel(this);
   LOG(LS_VERBOSE) << "WebRtcVoiceMediaChannel::WebRtcVoiceMediaChannel "
                   << voe_channel();
 
-  // Register external transport
-  if (engine->voe()->network()->RegisterExternalTransport(
-      voe_channel(), *static_cast<Transport*>(this)) == -1) {
-    LOG_RTCERR2(RegisterExternalTransport, voe_channel(), this);
-  }
-
-  // Enable RTCP (for quality stats and feedback messages)
-  EnableRtcp(voe_channel());
-
-  // Reset all recv codecs; they will be enabled via SetRecvCodecs.
-  ResetRecvCodecs(voe_channel());
-
-  // Disable the DTMF playout when a tone is sent.
-  // PlayDtmfTone will be used if local playout is needed.
-  if (engine->voe()->dtmf()->SetDtmfFeedbackStatus(false) == -1) {
-    LOG_RTCERR1(SetDtmfFeedbackStatus, false);
-  }
+  ConfigureSendChannel(voe_channel());
 }
 
 WebRtcVoiceMediaChannel::~WebRtcVoiceMediaChannel() {
   LOG(LS_VERBOSE) << "WebRtcVoiceMediaChannel::~WebRtcVoiceMediaChannel "
                   << voe_channel();
 
-  // DeRegister external transport
-  if (engine()->voe()->network()->DeRegisterExternalTransport(
-      voe_channel()) == -1) {
-    LOG_RTCERR1(DeRegisterExternalTransport, voe_channel());
-  }
+  // Remove any remaining send streams, the default channel will be deleted
+  // later.
+  while (!send_channels_.empty())
+    RemoveSendStream(send_channels_.begin()->first);
 
   // Unregister ourselves from the engine.
   engine()->UnregisterChannel(this);
@@ -1533,16 +1521,17 @@
     RemoveRecvStream(receive_channels_.begin()->first);
   }
 
-  // Delete the primary channel.
-  if (engine()->voe()->base()->DeleteChannel(voe_channel()) == -1) {
-    LOG_RTCERR1(DeleteChannel, voe_channel());
-  }
+  // Delete the default channel.
+  DeleteChannel(voe_channel());
 }
 
 bool WebRtcVoiceMediaChannel::SetOptions(const AudioOptions& options) {
   LOG(LS_INFO) << "Setting voice channel options: "
                << options.ToString();
 
+  // TODO(xians): Add support to set different options for different send
+  // streams after we support multiple APMs.
+
   // We retain all of the existing options, and apply the given ones
   // on top.  This means there is no way to "clear" options such that
   // they go back to the engine default.
@@ -1644,11 +1633,17 @@
 
 bool WebRtcVoiceMediaChannel::SetSendCodecs(
     const std::vector<AudioCodec>& codecs) {
+  // TODO(xians): Break down this function into SetSendCodecs(channel, codecs)
+  // to support per-channel codecs.
+
   // Disable DTMF, VAD, and FEC unless we know the other side wants them.
   dtmf_allowed_ = false;
-  engine()->voe()->codec()->SetVADStatus(voe_channel(), false);
-  engine()->voe()->rtp()->SetNACKStatus(voe_channel(), false, 0);
-  engine()->voe()->rtp()->SetFECStatus(voe_channel(), false);
+  for (ChannelMap::iterator iter = send_channels_.begin();
+       iter != send_channels_.end(); ++iter) {
+    engine()->voe()->codec()->SetVADStatus(iter->second.channel, false);
+    engine()->voe()->rtp()->SetNACKStatus(iter->second.channel, false, 0);
+    engine()->voe()->rtp()->SetFECStatus(iter->second.channel, false);
+  }
 
   // Scan through the list to figure out the codec to use for sending, along
   // with the proper configuration for VAD and DTMF.
@@ -1701,13 +1696,18 @@
       }
     }
 
-    // Find the DTMF telephone event "codec" and tell VoiceEngine about it.
+    // Find the DTMF telephone event "codec" and tell VoiceEngine channels
+    // about it.
     if (_stricmp(it->name.c_str(), "telephone-event") == 0 ||
         _stricmp(it->name.c_str(), "audio/telephone-event") == 0) {
-      if (engine()->voe()->dtmf()->SetSendTelephoneEventPayloadType(
-          voe_channel(), it->id) == -1) {
-        LOG_RTCERR2(SetSendTelephoneEventPayloadType, voe_channel(), it->id);
-        return false;
+      for (ChannelMap::iterator iter = send_channels_.begin();
+           iter != send_channels_.end(); ++iter) {
+        if (engine()->voe()->dtmf()->SetSendTelephoneEventPayloadType(
+                iter->second.channel, it->id) == -1) {
+          LOG_RTCERR2(SetSendTelephoneEventPayloadType,
+                      iter->second.channel, it->id);
+          return false;
+        }
       }
       dtmf_allowed_ = true;
     }
@@ -1732,28 +1732,35 @@
                           << " not supported.";
           continue;
       }
-      // The CN payload type for 8000 Hz clockrate is fixed at 13.
-      if (cn_freq != webrtc::kFreq8000Hz) {
-        if (engine()->voe()->codec()->SetSendCNPayloadType(voe_channel(),
-            it->id, cn_freq) == -1) {
-          LOG_RTCERR3(SetSendCNPayloadType, voe_channel(), it->id, cn_freq);
-          // TODO(ajm): This failure condition will be removed from VoE.
-          // Restore the return here when we update to a new enough webrtc.
-          //
-          // Not returning false because the SetSendCNPayloadType will fail if
-          // the channel is already sending.
-          // This can happen if the remote description is applied twice, for
-          // example in the case of ROAP on top of JSEP, where both side will
-          // send the offer.
+      // Loop through the existing send channels and set the CN payloadtype
+      // and the VAD status.
+      for (ChannelMap::iterator iter = send_channels_.begin();
+           iter != send_channels_.end(); ++iter) {
+        int channel = iter->second.channel;
+        // The CN payload type for 8000 Hz clockrate is fixed at 13.
+        if (cn_freq != webrtc::kFreq8000Hz) {
+          if (engine()->voe()->codec()->SetSendCNPayloadType(
+                  channel, it->id, cn_freq) == -1) {
+            LOG_RTCERR3(SetSendCNPayloadType, channel, it->id, cn_freq);
+            // TODO(ajm): This failure condition will be removed from VoE.
+            // Restore the return here when we update to a new enough webrtc.
+            //
+            // Not returning false because the SetSendCNPayloadType will fail if
+            // the channel is already sending.
+            // This can happen if the remote description is applied twice, for
+            // example in the case of ROAP on top of JSEP, where both side will
+            // send the offer.
+          }
         }
-      }
-      // Only turn on VAD if we have a CN payload type that matches the
-      // clockrate for the codec we are going to use.
-      if (it->clockrate == send_codec.plfreq) {
-        LOG(LS_INFO) << "Enabling VAD";
-        if (engine()->voe()->codec()->SetVADStatus(voe_channel(), true) == -1) {
-          LOG_RTCERR2(SetVADStatus, voe_channel(), true);
-          return false;
+
+        // Only turn on VAD if we have a CN payload type that matches the
+        // clockrate for the codec we are going to use.
+        if (it->clockrate == send_codec.plfreq) {
+          LOG(LS_INFO) << "Enabling VAD";
+          if (engine()->voe()->codec()->SetVADStatus(channel, true) == -1) {
+            LOG_RTCERR2(SetVADStatus, channel, true);
+            return false;
+          }
         }
       }
     }
@@ -1773,15 +1780,18 @@
         // Enable redundant encoding of the specified codec. Treat any
         // failure as a fatal internal error.
         LOG(LS_INFO) << "Enabling FEC";
-        if (engine()->voe()->rtp()->SetFECStatus(voe_channel(),
-                                                 true, it->id) == -1) {
-          LOG_RTCERR3(SetFECStatus, voe_channel(), true, it->id);
-          return false;
+        for (ChannelMap::iterator iter = send_channels_.begin();
+             iter != send_channels_.end(); ++iter) {
+          if (engine()->voe()->rtp()->SetFECStatus(iter->second.channel,
+                                                   true, it->id) == -1) {
+            LOG_RTCERR3(SetFECStatus, iter->second.channel, true, it->id);
+            return false;
+          }
         }
       } else {
         send_codec = voe_codec;
         nack_enabled_ = IsNackEnabled(*it);
-        SetNack(send_ssrc_, voe_channel(), nack_enabled_);
+        SetNack(send_channels_, nack_enabled_);
       }
       first = false;
       // Set the codec immediately, since SetVADStatus() depends on whether
@@ -1790,10 +1800,7 @@
         return false;
     }
   }
-  for (ChannelMap::iterator it = receive_channels_.begin();
-       it != receive_channels_.end(); ++it) {
-    SetNack(it->first, it->second.channel, nack_enabled_);
-  }
+  SetNack(receive_channels_, nack_enabled_);
 
 
   // If we're being asked to set an empty list of codecs, due to a buggy client,
@@ -1808,6 +1815,15 @@
 
   return true;
 }
+
+void WebRtcVoiceMediaChannel::SetNack(const ChannelMap& channels,
+                                      bool nack_enabled) {
+  for (ChannelMap::const_iterator it = channels.begin();
+       it != channels.end(); ++it) {
+    SetNack(it->first, it->second.channel, nack_enabled_);
+  }
+}
+
 void WebRtcVoiceMediaChannel::SetNack(uint32 ssrc, int channel,
                                       bool nack_enabled) {
   if (nack_enabled) {
@@ -1819,17 +1835,32 @@
   }
 }
 
-
 bool WebRtcVoiceMediaChannel::SetSendCodec(
     const webrtc::CodecInst& send_codec) {
   LOG(LS_INFO) << "Selected voice codec " << ToString(send_codec)
                << ", bitrate=" << send_codec.rate;
-  if (engine()->voe()->codec()->SetSendCodec(voe_channel(),
-                                             send_codec) == -1) {
-    LOG_RTCERR2(SetSendCodec, voe_channel(), ToString(send_codec));
+  for (ChannelMap::iterator iter = send_channels_.begin();
+       iter != send_channels_.end(); ++iter) {
+    if (!SetSendCodec(iter->second.channel, send_codec))
+      return false;
+  }
+
+  // All SetSendCodec calls were successful. Update the global state
+  // accordingly.
+  send_codec_.reset(new webrtc::CodecInst(send_codec));
+
+  return true;
+}
+
+bool WebRtcVoiceMediaChannel::SetSendCodec(
+    int channel, const webrtc::CodecInst& send_codec) {
+  LOG(LS_INFO) << "Send channel " << channel <<  " selected voice codec "
+               << ToString(send_codec) << ", bitrate=" << send_codec.rate;
+
+  if (engine()->voe()->codec()->SetSendCodec(channel, send_codec) == -1) {
+    LOG_RTCERR2(SetSendCodec, channel, ToString(send_codec));
     return false;
   }
-  send_codec_.reset(new webrtc::CodecInst(send_codec));
   return true;
 }
 
@@ -1862,10 +1893,14 @@
   }
 
   LOG(LS_INFO) << "Enabling audio level header extension with ID " << id;
-  if (engine()->voe()->rtp()->SetRTPAudioLevelIndicationStatus(
-      voe_channel(), enable, id) == -1) {
-    LOG_RTCERR3(SetRTPAudioLevelIndicationStatus, voe_channel(), enable, id);
-    return false;
+  for (ChannelMap::const_iterator iter = send_channels_.begin();
+       iter != send_channels_.end(); ++iter) {
+    if (engine()->voe()->rtp()->SetRTPAudioLevelIndicationStatus(
+            iter->second.channel, enable, id) == -1) {
+      LOG_RTCERR3(SetRTPAudioLevelIndicationStatus,
+                  iter->second.channel, enable, id);
+      return false;
+    }
   }
 
   return true;
@@ -1912,7 +1947,7 @@
 
 bool WebRtcVoiceMediaChannel::SetSend(SendFlags send) {
   desired_send_ = send;
-  if (send_ssrc_ != 0)
+  if (!send_channels_.empty())
     return ChangeSend(desired_send_);
   return true;
 }
@@ -1930,131 +1965,177 @@
     return true;
   }
 
-  if (send == SEND_MICROPHONE) {
+  // Change the settings on each send channel.
+  if (send == SEND_MICROPHONE)
     engine()->SetOptionOverrides(options_);
 
-    // VoiceEngine resets sequence number when StopSend is called. This
-    // sometimes causes libSRTP to complain about packets being
-    // replayed. To get around this we store the last sent sequence
-    // number and initializes the channel with the next to continue on
-    // the same sequence.
-    if (sequence_number() != -1) {
-      LOG(LS_INFO) << "WebRtcVoiceMediaChannel restores seqnum="
-                   << sequence_number() + 1;
-      if (engine()->voe()->sync()->SetInitSequenceNumber(
-              voe_channel(), sequence_number() + 1) == -1) {
-        LOG_RTCERR2(SetInitSequenceNumber, voe_channel(),
-                    sequence_number() + 1);
-      }
-    }
-    if (engine()->voe()->base()->StartSend(voe_channel()) == -1) {
-      LOG_RTCERR1(StartSend, voe_channel());
+  // Change the settings on each send channel.
+  for (ChannelMap::iterator iter = send_channels_.begin();
+       iter != send_channels_.end(); ++iter) {
+    if (!ChangeSend(iter->second.channel, send))
       return false;
-    }
-    // It's OK not to have file() here, since we don't need to call Stop if
-    // no file is playing.
-    if (engine()->voe()->file() &&
-        engine()->voe()->file()->StopPlayingFileAsMicrophone(
-            voe_channel()) == -1) {
-      LOG_RTCERR1(StopPlayingFileAsMicrophone, voe_channel());
-      return false;
-    }
-  } else if (send == SEND_RINGBACKTONE) {
-    ASSERT(ringback_tone_);
-    if (!ringback_tone_) {
-      return false;
-    }
-    if (engine()->voe()->file() &&
-        engine()->voe()->file()->StartPlayingFileAsMicrophone(
-        voe_channel(), ringback_tone_.get(), false) != -1) {
-      LOG(LS_INFO) << "File StartPlayingFileAsMicrophone Succeeded. channel:"
-                   << voe_channel();
-    } else {
-      LOG_RTCERR3(StartPlayingFileAsMicrophone, voe_channel(),
-                  ringback_tone_.get(), false);
-      return false;
-    }
-    // VoiceEngine resets sequence number when StopSend is called. This
-    // sometimes causes libSRTP to complain about packets being
-    // replayed. To get around this we store the last sent sequence
-    // number and initializes the channel with the next to continue on
-    // the same sequence.
-    if (sequence_number() != -1) {
-      LOG(LS_INFO) << "WebRtcVoiceMediaChannel restores seqnum="
-                   << sequence_number() + 1;
-      if (engine()->voe()->sync()->SetInitSequenceNumber(
-              voe_channel(), sequence_number() + 1) == -1) {
-        LOG_RTCERR2(SetInitSequenceNumber, voe_channel(),
-                    sequence_number() + 1);
-      }
-    }
-    if (engine()->voe()->base()->StartSend(voe_channel()) == -1) {
-      LOG_RTCERR1(StartSend, voe_channel());
-      return false;
-    }
-  } else {  // SEND_NOTHING
-    if (engine()->voe()->base()->StopSend(voe_channel()) == -1) {
-      LOG_RTCERR1(StopSend, voe_channel());
-    }
-
-    engine()->ClearOptionOverrides();
   }
+
+  // Clear up the options after stopping sending.
+  if (send == SEND_NOTHING)
+    engine()->ClearOptionOverrides();
+
   send_ = send;
   return true;
 }
 
-bool WebRtcVoiceMediaChannel::AddSendStream(const StreamParams& sp) {
-  if (send_ssrc_ != 0) {
-    LOG(LS_ERROR) << "WebRtcVoiceMediaChannel supports one sending channel.";
-    return false;
-  }
-
-  if (engine()->voe()->rtp()->SetLocalSSRC(voe_channel(), sp.first_ssrc())
-        == -1) {
-    LOG_RTCERR2(SetSendSSRC, voe_channel(), sp.first_ssrc());
-    return false;
-  }
-  // Set the SSRC on the receive channels.
-  // Receive channels have to have the same SSRC in order to send receiver
-  // reports with this SSRC.
-  for (ChannelMap::const_iterator it = receive_channels_.begin();
-       it != receive_channels_.end(); ++it) {
-    int channel_id = it->second.channel;
-    if (channel_id != voe_channel()) {
-      if (engine()->voe()->rtp()->SetLocalSSRC(channel_id,
-                                               sp.first_ssrc()) != 0) {
-        LOG_RTCERR1(SetLocalSSRC, it->first);
-        return false;
-      }
+bool WebRtcVoiceMediaChannel::ChangeSend(int channel, SendFlags send) {
+  if (send == SEND_MICROPHONE) {
+    if (engine()->voe()->base()->StartSend(channel) == -1) {
+      LOG_RTCERR1(StartSend, channel);
+      return false;
+    }
+    if (engine()->voe()->file() &&
+        engine()->voe()->file()->StopPlayingFileAsMicrophone(channel) == -1) {
+      LOG_RTCERR1(StopPlayingFileAsMicrophone, channel);
+      return false;
+    }
+  } else {  // SEND_NOTHING
+    ASSERT(send == SEND_NOTHING);
+    if (engine()->voe()->base()->StopSend(channel) == -1) {
+      LOG_RTCERR1(StopSend, channel);
+      return false;
     }
   }
 
-  if (engine()->voe()->rtp()->SetRTCP_CNAME(voe_channel(),
-                                            sp.cname.c_str()) == -1) {
-     LOG_RTCERR2(SetRTCP_CNAME, voe_channel(), sp.cname);
-     return false;
-  }
-
-  send_ssrc_ = sp.first_ssrc();
-  if (desired_send_ != send_)
-    return ChangeSend(desired_send_);
-
-  if (local_renderer_)
-    local_renderer_->AddChannel(voe_channel());
-
   return true;
 }
 
-bool WebRtcVoiceMediaChannel::RemoveSendStream(uint32 ssrc) {
-  if (ssrc != send_ssrc_) {
+void WebRtcVoiceMediaChannel::ConfigureSendChannel(int channel) {
+  if (engine()->voe()->network()->RegisterExternalTransport(
+          channel, *this) == -1) {
+    LOG_RTCERR2(RegisterExternalTransport, channel, this);
+  }
+
+  // Enable RTCP (for quality stats and feedback messages)
+  EnableRtcp(channel);
+
+  // Reset all recv codecs; they will be enabled via SetRecvCodecs.
+  ResetRecvCodecs(channel);
+}
+
+bool WebRtcVoiceMediaChannel::DeleteChannel(int channel) {
+  if (engine()->voe()->network()->DeRegisterExternalTransport(channel) == -1) {
+    LOG_RTCERR1(DeRegisterExternalTransport, channel);
+  }
+
+  if (engine()->voe()->base()->DeleteChannel(channel) == -1) {
+    LOG_RTCERR1(DeleteChannel, channel);
     return false;
   }
 
-  if (local_renderer_)
-    local_renderer_->RemoveChannel(voe_channel());
+  return true;
+}
 
-  send_ssrc_ = 0;
-  ChangeSend(SEND_NOTHING);
+bool WebRtcVoiceMediaChannel::AddSendStream(const StreamParams& sp) {
+  // If the default channel is already used for sending create a new channel
+  // otherwise use the default channel for sending.
+  int channel = GetSendChannelNum(sp.first_ssrc());
+  if (channel != -1) {
+    LOG(LS_ERROR) << "Stream already exists with ssrc " << sp.first_ssrc();
+    return false;
+  }
+
+  bool default_channel_is_available = true;
+  for (ChannelMap::const_iterator iter = send_channels_.begin();
+       iter != send_channels_.end(); ++iter) {
+    if (IsDefaultChannel(iter->second.channel)) {
+      default_channel_is_available = false;
+      break;
+    }
+  }
+  if (default_channel_is_available) {
+    channel = voe_channel();
+  } else {
+    // Create a new channel for sending audio data.
+    channel = engine()->voe()->base()->CreateChannel();
+    if (channel == -1) {
+      LOG_RTCERR0(CreateChannel);
+      return false;
+    }
+
+    ConfigureSendChannel(channel);
+  }
+
+  // Save the channel to send_channels_, so that RemoveSendStream() can still
+  // delete the channel in case failure happens below.
+  send_channels_[sp.first_ssrc()] = WebRtcVoiceChannelInfo(channel, NULL);
+
+  // Set the send (local) SSRC.
+  // If there are multiple send SSRCs, we can only set the first one here, and
+  // the rest of the SSRC(s) need to be set after SetSendCodec has been called
+  // (with a codec requires multiple SSRC(s)).
+  if (engine()->voe()->rtp()->SetLocalSSRC(channel, sp.first_ssrc()) == -1) {
+    LOG_RTCERR2(SetSendSSRC, channel, sp.first_ssrc());
+    return false;
+  }
+
+  // At this point the channel's local SSRC has been updated. If the channel is
+  // the default channel make sure that all the receive channels are updated as
+  // well. Receive channels have to have the same SSRC as the default channel in
+  // order to send receiver reports with this SSRC.
+  if (IsDefaultChannel(channel)) {
+    for (ChannelMap::const_iterator it = receive_channels_.begin();
+         it != receive_channels_.end(); ++it) {
+      // Only update the SSRC for non-default channels.
+      if (!IsDefaultChannel(it->second.channel)) {
+        if (engine()->voe()->rtp()->SetLocalSSRC(it->second.channel,
+                                                 sp.first_ssrc()) != 0) {
+          LOG_RTCERR2(SetLocalSSRC, it->second.channel, sp.first_ssrc());
+          return false;
+        }
+      }
+    }
+  }
+
+  if (engine()->voe()->rtp()->SetRTCP_CNAME(channel, sp.cname.c_str()) == -1) {
+     LOG_RTCERR2(SetRTCP_CNAME, channel, sp.cname);
+     return false;
+  }
+
+  // Set the current codec to be used for the new channel.
+  if (send_codec_ && !SetSendCodec(channel, *send_codec_))
+    return false;
+
+  return ChangeSend(channel, desired_send_);
+}
+
+bool WebRtcVoiceMediaChannel::RemoveSendStream(uint32 ssrc) {
+  ChannelMap::iterator it = send_channels_.find(ssrc);
+  if (it == send_channels_.end()) {
+    LOG(LS_WARNING) << "Try to remove stream with ssrc " << ssrc
+                    << " which doesn't exist.";
+    return false;
+  }
+
+  int channel = it->second.channel;
+  ChangeSend(channel, SEND_NOTHING);
+
+  // Notify the audio renderer that the send channel is going away.
+  if (it->second.renderer)
+    it->second.renderer->RemoveChannel(channel);
+
+  if (IsDefaultChannel(channel)) {
+    // Do not delete the default channel since the receive channels depend on
+    // the default channel, recycle it instead.
+    ChangeSend(channel, SEND_NOTHING);
+  } else {
+    // Clean up and delete the send channel.
+    LOG(LS_INFO) << "Removing audio send stream " << ssrc
+                 << " with VoiceEngine channel #" << channel << ".";
+    if (!DeleteChannel(channel))
+      return false;
+  }
+
+  send_channels_.erase(it);
+  if (send_channels_.empty())
+    ChangeSend(SEND_NOTHING);
+
   return true;
 }
 
@@ -2157,11 +2238,14 @@
 bool WebRtcVoiceMediaChannel::RemoveRecvStream(uint32 ssrc) {
   talk_base::CritScope lock(&receive_channels_cs_);
   ChannelMap::iterator it = receive_channels_.find(ssrc);
-  if (it == receive_channels_.end())
+  if (it == receive_channels_.end()) {
+    LOG(LS_WARNING) << "Try to remove stream with ssrc " << ssrc
+                    << " which doesn't exist.";
     return false;
+  }
 
   if (ssrc == default_receive_ssrc_) {
-    ASSERT(voe_channel() == it->second.channel);
+    ASSERT(IsDefaultChannel(it->second.channel));
     // Recycle the default channel is for recv stream.
     if (playout_)
       SetPlayout(voe_channel(), false);
@@ -2179,16 +2263,9 @@
   if (it->second.renderer)
     it->second.renderer->RemoveChannel(it->second.channel);
 
-  if (engine()->voe()->network()->DeRegisterExternalTransport(
-          it->second.channel) == -1) {
-    LOG_RTCERR1(DeRegisterExternalTransport, it->second.channel);
-  }
-
   LOG(LS_INFO) << "Removing audio stream " << ssrc
-               << " with VoiceEngine channel #"
-               << it->second.channel << ".";
-  if (engine()->voe()->base()->DeleteChannel(it->second.channel) == -1) {
-    LOG_RTCERR1(DeleteChannel, voe_channel());
+               << " with VoiceEngine channel #" << it->second.channel << ".";
+  if (!DeleteChannel(it->second.channel)) {
     // Erase the entry anyhow.
     receive_channels_.erase(it);
     return false;
@@ -2224,7 +2301,7 @@
   if (it == receive_channels_.end()) {
     if (renderer) {
       // Return an error if trying to set a valid renderer with an invalid ssrc.
-      LOG_RTCERR1(SetRemoteRenderer, ssrc);
+      LOG(LS_ERROR) << "SetRemoteRenderer failed with ssrc "<< ssrc;
       return false;
     }
 
@@ -2232,43 +2309,47 @@
     return true;
   }
 
+  AudioRenderer* remote_renderer = it->second.renderer;
   if (renderer) {
-    ASSERT(it->second.renderer == NULL || it->second.renderer == renderer);
-    if (!it->second.renderer) {
+    ASSERT(remote_renderer == NULL || remote_renderer == renderer);
+    if (!remote_renderer) {
       renderer->AddChannel(it->second.channel);
     }
-  } else if (it->second.renderer) {
+  } else if (remote_renderer) {
     // |renderer| == NULL, remove the channel from the renderer.
-    it->second.renderer->RemoveChannel(it->second.channel);
+    remote_renderer->RemoveChannel(it->second.channel);
   }
 
+  // Assign the new value to the struct.
   it->second.renderer = renderer;
   return true;
 }
 
 bool WebRtcVoiceMediaChannel::SetLocalRenderer(uint32 ssrc,
                                                AudioRenderer* renderer) {
-  if (!renderer && !local_renderer_)
+  ChannelMap::iterator it = send_channels_.find(ssrc);
+  if (it == send_channels_.end()) {
+    if (renderer) {
+      // Return an error if trying to set a valid renderer with an invalid ssrc.
+      LOG(LS_ERROR) << "SetLocalRenderer failed with ssrc "<< ssrc;
+      return false;
+    }
+
+    // The channel likely has gone away, do nothing.
     return true;
-
-  int channel = GetSendChannelNum(ssrc);
-  if (channel == -1) {
-    // Invalidate the |local_renderer_| before quitting.
-    if (!renderer)
-      local_renderer_ = NULL;
-
-    return false;
   }
 
+  AudioRenderer* local_renderer = it->second.renderer;
   if (renderer) {
-    ASSERT(local_renderer_ == NULL || local_renderer_ == renderer);
-    if (!local_renderer_)
-      renderer->AddChannel(channel);
-  } else {
-    local_renderer_->RemoveChannel(channel);
+    ASSERT(local_renderer == NULL || local_renderer == renderer);
+    if (!local_renderer)
+      renderer->AddChannel(it->second.channel);
+  } else if (local_renderer) {
+    local_renderer->RemoveChannel(it->second.channel);
   }
 
-  local_renderer_ = renderer;
+  // Assign the new value to the struct.
+  it->second.renderer = renderer;
   return true;
 }
 
@@ -2466,15 +2547,16 @@
 
   // Send the event.
   if (flags & cricket::DF_SEND) {
-    if (send_ssrc_ != ssrc && ssrc != 0) {
+    int channel = (ssrc == 0) ? voe_channel() : GetSendChannelNum(ssrc);
+    if (channel == -1) {
       LOG(LS_WARNING) << "InsertDtmf - The specified ssrc "
                       << ssrc << " is not in use.";
       return false;
     }
     // Send DTMF using out-of-band DTMF. ("true", as 3rd arg)
-    if (engine()->voe()->dtmf()->SendTelephoneEvent(voe_channel(),
-        event, true, duration) == -1) {
-      LOG_RTCERR4(SendTelephoneEvent, voe_channel(), event, true, duration);
+    if (engine()->voe()->dtmf()->SendTelephoneEvent(
+            channel, event, true, duration) == -1) {
+      LOG_RTCERR4(SendTelephoneEvent, channel, event, true, duration);
       return false;
     }
   }
@@ -2525,27 +2607,56 @@
 }
 
 void WebRtcVoiceMediaChannel::OnRtcpReceived(talk_base::Buffer* packet) {
-  // See above.
-  int which_channel = GetReceiveChannelNum(
-      ParseSsrc(packet->data(), packet->length(), true));
-  if (which_channel == -1) {
-    which_channel = voe_channel();
+  // Sending channels need all RTCP packets with feedback information.
+  // Even sender reports can contain attached report blocks.
+  // Receiving channels need sender reports in order to create
+  // correct receiver reports.
+  int type = 0;
+  if (!GetRtcpType(packet->data(), packet->length(), &type)) {
+    LOG(LS_WARNING) << "Failed to parse type from received RTCP packet";
+    return;
   }
 
-  engine()->voe()->network()->ReceivedRTCPPacket(
-      which_channel,
-      packet->data(),
-      static_cast<unsigned int>(packet->length()));
+  // If it is a sender report, find the channel that is listening.
+  bool has_sent_to_default_channel = false;
+  if (type == kRtcpTypeSR) {
+    int which_channel = GetReceiveChannelNum(
+        ParseSsrc(packet->data(), packet->length(), true));
+    if (which_channel != -1) {
+      engine()->voe()->network()->ReceivedRTCPPacket(
+          which_channel,
+          packet->data(),
+          static_cast<unsigned int>(packet->length()));
+
+      if (IsDefaultChannel(which_channel))
+        has_sent_to_default_channel = true;
+    }
+  }
+
+  // SR may continue RR and any RR entry may correspond to any one of the send
+  // channels. So all RTCP packets must be forwarded all send channels. VoE
+  // will filter out RR internally.
+  for (ChannelMap::iterator iter = send_channels_.begin();
+       iter != send_channels_.end(); ++iter) {
+    // Make sure not sending the same packet to default channel more than once.
+    if (IsDefaultChannel(iter->second.channel) && has_sent_to_default_channel)
+      continue;
+
+    engine()->voe()->network()->ReceivedRTCPPacket(
+        iter->second.channel,
+        packet->data(),
+        static_cast<unsigned int>(packet->length()));
+  }
 }
 
 bool WebRtcVoiceMediaChannel::MuteStream(uint32 ssrc, bool muted) {
-  if (send_ssrc_ != ssrc && ssrc != 0) {
+  int channel = (ssrc == 0) ? voe_channel() : GetSendChannelNum(ssrc);
+  if (channel == -1) {
     LOG(LS_WARNING) << "The specified ssrc " << ssrc << " is not in use.";
     return false;
   }
-  if (engine()->voe()->volume()->SetInputMute(voe_channel(),
-      muted) == -1) {
-    LOG_RTCERR2(SetInputMute, voe_channel(), muted);
+  if (engine()->voe()->volume()->SetInputMute(channel, muted) == -1) {
+    LOG_RTCERR2(SetInputMute, channel, muted);
     return false;
   }
   return true;
@@ -2590,96 +2701,106 @@
 }
 
 bool WebRtcVoiceMediaChannel::GetStats(VoiceMediaInfo* info) {
-  // In VoiceEngine 3.5, GetRTCPStatistics will return 0 even when it fails,
-  // causing the stats to contain garbage information. To prevent this, we
-  // zero the stats structure before calling this API.
-  // TODO(juberti): Remove this workaround.
+  bool echo_metrics_on = false;
+  // These can take on valid negative values, so use the lowest possible level
+  // as default rather than -1.
+  int echo_return_loss = -100;
+  int echo_return_loss_enhancement = -100;
+  // These can also be negative, but in practice -1 is only used to signal
+  // insufficient data, since the resolution is limited to multiples of 4 ms.
+  int echo_delay_median_ms = -1;
+  int echo_delay_std_ms = -1;
+  if (engine()->voe()->processing()->GetEcMetricsStatus(
+          echo_metrics_on) != -1 && echo_metrics_on) {
+    // TODO(ajm): we may want to use VoECallReport::GetEchoMetricsSummary
+    // here, but it appears to be unsuitable currently. Revisit after this is
+    // investigated: http://b/issue?id=5666755
+    int erl, erle, rerl, anlp;
+    if (engine()->voe()->processing()->GetEchoMetrics(
+            erl, erle, rerl, anlp) != -1) {
+      echo_return_loss = erl;
+      echo_return_loss_enhancement = erle;
+    }
+
+    int median, std;
+    if (engine()->voe()->processing()->GetEcDelayMetrics(median, std) != -1) {
+      echo_delay_median_ms = median;
+      echo_delay_std_ms = std;
+    }
+  }
+
+
   webrtc::CallStatistics cs;
   unsigned int ssrc;
   webrtc::CodecInst codec;
   unsigned int level;
 
-  // Fill in the sender info, based on what we know, and what the
-  // remote side told us it got from its RTCP report.
-  VoiceSenderInfo sinfo;
+  for (ChannelMap::const_iterator channel_iter = send_channels_.begin();
+       channel_iter != send_channels_.end(); ++channel_iter) {
+    const int channel = channel_iter->second.channel;
 
-  // Data we obtain locally.
-  memset(&cs, 0, sizeof(cs));
-  if (engine()->voe()->rtp()->GetRTCPStatistics(voe_channel(), cs) == -1 ||
-      engine()->voe()->rtp()->GetLocalSSRC(voe_channel(), ssrc) == -1) {
-    return false;
-  }
+    // Fill in the sender info, based on what we know, and what the
+    // remote side told us it got from its RTCP report.
+    VoiceSenderInfo sinfo;
 
-  sinfo.ssrc = ssrc;
-  sinfo.codec_name = send_codec_.get() ? send_codec_->plname : "";
-  sinfo.bytes_sent = cs.bytesSent;
-  sinfo.packets_sent = cs.packetsSent;
-  // RTT isn't known until a RTCP report is received. Until then, VoiceEngine
-  // returns 0 to indicate an error value.
-  sinfo.rtt_ms = (cs.rttMs > 0) ? cs.rttMs : -1;
+    if (engine()->voe()->rtp()->GetRTCPStatistics(channel, cs) == -1 ||
+        engine()->voe()->rtp()->GetLocalSSRC(channel, ssrc) == -1) {
+      continue;
+    }
 
-  // Get data from the last remote RTCP report. Use default values if no data
-  // available.
-  sinfo.fraction_lost = -1.0;
-  sinfo.jitter_ms = -1;
-  sinfo.packets_lost = -1;
-  sinfo.ext_seqnum = -1;
-  std::vector<webrtc::ReportBlock> receive_blocks;
-  if (engine()->voe()->rtp()->GetRemoteRTCPReportBlocks(
-      voe_channel(), &receive_blocks) != -1 &&
-      engine()->voe()->codec()->GetSendCodec(voe_channel(),
-          codec) != -1) {
-    std::vector<webrtc::ReportBlock>::iterator iter;
-    for (iter = receive_blocks.begin(); iter != receive_blocks.end(); ++iter) {
-      // Lookup report for send ssrc only.
-      if (iter->source_SSRC == sinfo.ssrc) {
-        // Convert Q8 to floating point.
-        sinfo.fraction_lost = static_cast<float>(iter->fraction_lost) / 256;
-        // Convert samples to milliseconds.
-        if (codec.plfreq / 1000 > 0) {
-          sinfo.jitter_ms = iter->interarrival_jitter / (codec.plfreq / 1000);
+    sinfo.ssrc = ssrc;
+    sinfo.codec_name = send_codec_.get() ? send_codec_->plname : "";
+    sinfo.bytes_sent = cs.bytesSent;
+    sinfo.packets_sent = cs.packetsSent;
+    // RTT isn't known until a RTCP report is received. Until then, VoiceEngine
+    // returns 0 to indicate an error value.
+    sinfo.rtt_ms = (cs.rttMs > 0) ? cs.rttMs : -1;
+
+    // Get data from the last remote RTCP report. Use default values if no data
+    // available.
+    sinfo.fraction_lost = -1.0;
+    sinfo.jitter_ms = -1;
+    sinfo.packets_lost = -1;
+    sinfo.ext_seqnum = -1;
+    std::vector<webrtc::ReportBlock> receive_blocks;
+    if (engine()->voe()->rtp()->GetRemoteRTCPReportBlocks(
+            channel, &receive_blocks) != -1 &&
+        engine()->voe()->codec()->GetSendCodec(channel, codec) != -1) {
+      std::vector<webrtc::ReportBlock>::iterator iter;
+      for (iter = receive_blocks.begin(); iter != receive_blocks.end();
+           ++iter) {
+        // Lookup report for send ssrc only.
+        if (iter->source_SSRC == sinfo.ssrc) {
+          // Convert Q8 to floating point.
+          sinfo.fraction_lost = static_cast<float>(iter->fraction_lost) / 256;
+          // Convert samples to milliseconds.
+          if (codec.plfreq / 1000 > 0) {
+            sinfo.jitter_ms = iter->interarrival_jitter / (codec.plfreq / 1000);
+          }
+          sinfo.packets_lost = iter->cumulative_num_packets_lost;
+          sinfo.ext_seqnum = iter->extended_highest_sequence_number;
+          break;
         }
-        sinfo.packets_lost = iter->cumulative_num_packets_lost;
-        sinfo.ext_seqnum = iter->extended_highest_sequence_number;
-        break;
       }
     }
+
+    // Local speech level.
+    sinfo.audio_level = (engine()->voe()->volume()->
+        GetSpeechInputLevelFullRange(level) != -1) ? level : -1;
+
+    // TODO(xians): We are injecting the same APM logging to all the send
+    // channels here because there is no good way to know which send channel
+    // is using the APM. The correct fix is to allow the send channels to have
+    // their own APM so that we can feed the correct APM logging to different
+    // send channels. See issue crbug/264611 .
+    sinfo.echo_return_loss = echo_return_loss;
+    sinfo.echo_return_loss_enhancement = echo_return_loss_enhancement;
+    sinfo.echo_delay_median_ms = echo_delay_median_ms;
+    sinfo.echo_delay_std_ms = echo_delay_std_ms;
+
+    info->senders.push_back(sinfo);
   }
 
-  // Local speech level.
-  sinfo.audio_level = (engine()->voe()->volume()->
-      GetSpeechInputLevelFullRange(level) != -1) ? level : -1;
-
-  bool echo_metrics_on = false;
-  // These can take on valid negative values, so use the lowest possible level
-  // as default rather than -1.
-  sinfo.echo_return_loss = -100;
-  sinfo.echo_return_loss_enhancement = -100;
-  // These can also be negative, but in practice -1 is only used to signal
-  // insufficient data, since the resolution is limited to multiples of 4 ms.
-  sinfo.echo_delay_median_ms = -1;
-  sinfo.echo_delay_std_ms = -1;
-  if (engine()->voe()->processing()->GetEcMetricsStatus(echo_metrics_on) !=
-      -1 && echo_metrics_on) {
-    // TODO(ajm): we may want to use VoECallReport::GetEchoMetricsSummary
-    // here, but it appears to be unsuitable currently. Revisit after this is
-    // investigated: http://b/issue?id=5666755
-    int erl, erle, rerl, anlp;
-    if (engine()->voe()->processing()->GetEchoMetrics(erl, erle, rerl, anlp) !=
-        -1) {
-      sinfo.echo_return_loss = erl;
-      sinfo.echo_return_loss_enhancement = erle;
-    }
-
-    int median, std;
-    if (engine()->voe()->processing()->GetEcDelayMetrics(median, std) != -1) {
-      sinfo.echo_delay_median_ms = median;
-      sinfo.echo_delay_std_ms = std;
-    }
-  }
-
-  info->senders.push_back(sinfo);
-
   // Build the list of receivers, one for each receiving channel, or 1 in
   // a 1:1 call.
   std::vector<int> channels;
@@ -2749,15 +2870,7 @@
 bool WebRtcVoiceMediaChannel::FindSsrc(int channel_num, uint32* ssrc) {
   talk_base::CritScope lock(&receive_channels_cs_);
   ASSERT(ssrc != NULL);
-  if (channel_num == voe_channel()) {
-    unsigned local_ssrc = 0;
-    // This is a sending channel.
-    if (engine()->voe()->rtp()->GetLocalSSRC(
-        channel_num, local_ssrc) != -1) {
-      *ssrc = local_ssrc;
-    }
-    return true;
-  } else if (channel_num == -1 && send_ != SEND_NOTHING) {
+  if (channel_num == -1 && send_ != SEND_NOTHING) {
     // Sometimes the VoiceEngine core will throw error with channel_num = -1.
     // This means the error is not limited to a specific channel.  Signal the
     // message using ssrc=0.  If the current channel is sending, use this
@@ -2765,6 +2878,20 @@
     *ssrc = 0;
     return true;
   } else {
+    // Check whether this is a sending channel.
+    for (ChannelMap::const_iterator it = send_channels_.begin();
+         it != send_channels_.end(); ++it) {
+      if (it->second.channel == channel_num) {
+        // This is a sending channel.
+        uint32 local_ssrc = 0;
+        if (engine()->voe()->rtp()->GetLocalSSRC(
+                channel_num, local_ssrc) != -1) {
+          *ssrc = local_ssrc;
+        }
+        return true;
+      }
+    }
+
     // Check whether this is a receiving channel.
     for (ChannelMap::const_iterator it = receive_channels_.begin();
         it != receive_channels_.end(); ++it) {
@@ -2796,7 +2923,11 @@
 }
 
 int WebRtcVoiceMediaChannel::GetSendChannelNum(uint32 ssrc) {
-  return (ssrc == send_ssrc_) ?  voe_channel() : -1;
+  ChannelMap::iterator it = send_channels_.find(ssrc);
+  if (it != send_channels_.end())
+    return it->second.channel;
+
+  return -1;
 }
 
 bool WebRtcVoiceMediaChannel::GetRedSendCodec(const AudioCodec& red_codec,
@@ -2848,7 +2979,7 @@
 
 bool WebRtcVoiceMediaChannel::EnableRtcp(int channel) {
   if (engine()->voe()->rtp()->SetRTCPStatus(channel, true) == -1) {
-    LOG_RTCERR2(SetRTCPStatus, voe_channel(), 1);
+    LOG_RTCERR2(SetRTCPStatus, channel, 1);
     return false;
   }
   // TODO(juberti): Enable VQMon and RTCP XR reports, once we know what
diff --git a/talk/media/webrtc/webrtcvoiceengine.h b/talk/media/webrtc/webrtcvoiceengine.h
index 036117f..0c2b613 100644
--- a/talk/media/webrtc/webrtcvoiceengine.h
+++ b/talk/media/webrtc/webrtcvoiceengine.h
@@ -275,7 +275,7 @@
 class WebRtcMediaChannel : public T, public webrtc::Transport {
  public:
   WebRtcMediaChannel(E *engine, int channel)
-      : engine_(engine), voe_channel_(channel), sequence_number_(-1) {}
+      : engine_(engine), voe_channel_(channel) {}
   E *engine() { return engine_; }
   int voe_channel() const { return voe_channel_; }
   bool valid() const { return voe_channel_ != -1; }
@@ -283,23 +283,10 @@
  protected:
   // implements Transport interface
   virtual int SendPacket(int channel, const void *data, int len) {
-    // We need to store the sequence number to be able to pick up
-    // the same sequence when the device is restarted.
-    // TODO(oja): Remove when WebRtc has fixed the problem.
-    int seq_num;
-    if (!GetRtpSeqNum(data, len, &seq_num)) {
-      return -1;
-    }
-    if (sequence_number() == -1) {
-      LOG(INFO) << "WebRtcVoiceMediaChannel sends first packet seqnum="
-                << seq_num;
-    }
-
     talk_base::Buffer packet(data, len, kMaxRtpPacketLen);
     if (!T::SendPacket(&packet)) {
       return -1;
     }
-    sequence_number_ = seq_num;
     return len;
   }
 
@@ -308,14 +295,9 @@
     return T::SendRtcp(&packet) ? len : -1;
   }
 
-  int sequence_number() const {
-    return sequence_number_;
-  }
-
  private:
   E *engine_;
   int voe_channel_;
-  int sequence_number_;
 };
 
 // WebRtcVoiceMediaChannel is an implementation of VoiceMediaChannel that uses
@@ -393,16 +375,24 @@
 
  private:
   struct WebRtcVoiceChannelInfo;
+  typedef std::map<uint32, WebRtcVoiceChannelInfo> ChannelMap;
 
   void SetNack(uint32 ssrc, int channel, bool nack_enabled);
+  void SetNack(const ChannelMap& channels, bool nack_enabled);
   bool SetSendCodec(const webrtc::CodecInst& send_codec);
+  bool SetSendCodec(int channel, const webrtc::CodecInst& send_codec);
   bool ChangePlayout(bool playout);
   bool ChangeSend(SendFlags send);
+  bool ChangeSend(int channel, SendFlags send);
+  void ConfigureSendChannel(int channel);
+  bool DeleteChannel(int channel);
   bool InConferenceMode() const {
     return options_.conference_mode.GetWithDefaultIfUnset(false);
   }
+  bool IsDefaultChannel(int channel_id) const {
+    return channel_id == voe_channel();
+  }
 
-  typedef std::map<uint32, WebRtcVoiceChannelInfo> ChannelMap;
   talk_base::scoped_ptr<WebRtcSoundclipStream> ringback_tone_;
   std::set<int> ringback_channels_;  // channels playing ringback
   std::vector<AudioCodec> recv_codecs_;
@@ -415,17 +405,14 @@
   SendFlags desired_send_;
   SendFlags send_;
 
-  // TODO(xians): Add support for multiple send channels.
-  uint32 send_ssrc_;
-  // Weak pointer to the renderer of the local audio track. It is owned by the
-  // track and will set to NULL when the track is going away or channel gets
-  // deleted. Used to notify the audio track that the media channel is added
-  // or removed.
-  AudioRenderer* local_renderer_;
+  // send_channels_ contains the channels which are being used for sending.
+  // When the default channel (voe_channel) is used for sending, it is
+  // contained in send_channels_, otherwise not.
+  ChannelMap send_channels_;
   uint32 default_receive_ssrc_;
   // Note the default channel (voe_channel()) can reside in both
-  // receive_channels_ and send channel in non-conference mode and in that case
-  // it will only be there if a non-zero default_receive_ssrc_ is set.
+  // receive_channels_ and send_channels_ in non-conference mode and in that
+  // case it will only be there if a non-zero default_receive_ssrc_ is set.
   ChannelMap receive_channels_;  // for multiple sources
   // receive_channels_ can be read from WebRtc callback thread.  Access from
   // the WebRtc thread must be synchronized with edits on the worker thread.
diff --git a/talk/media/webrtc/webrtcvoiceengine_unittest.cc b/talk/media/webrtc/webrtcvoiceengine_unittest.cc
index b476b4d..31596cd 100644
--- a/talk/media/webrtc/webrtcvoiceengine_unittest.cc
+++ b/talk/media/webrtc/webrtcvoiceengine_unittest.cc
@@ -121,6 +121,18 @@
     }
     return result;
   }
+  void SetupForMultiSendStream() {
+    EXPECT_TRUE(SetupEngine());
+    // Remove stream added in Setup, which is corresponding to default channel.
+    int default_channel_num = voe_.GetLastChannel();
+    uint32 default_send_ssrc;
+    EXPECT_EQ(0, voe_.GetLocalSSRC(default_channel_num, default_send_ssrc));
+    EXPECT_EQ(kSsrc1, default_send_ssrc);
+    EXPECT_TRUE(channel_->RemoveSendStream(default_send_ssrc));
+
+    // Verify the default channel still exists.
+    EXPECT_EQ(0, voe_.GetLocalSSRC(default_channel_num, default_send_ssrc));
+  }
   void DeliverPacket(const void* data, int len) {
     talk_base::Buffer packet(data, len);
     channel_->OnPacketReceived(&packet);
@@ -205,6 +217,47 @@
   }
 
 
+  void TestSetSendRtpHeaderExtensions(int channel_id) {
+    std::vector<cricket::RtpHeaderExtension> extensions;
+    bool enable = false;
+    unsigned char id = 0;
+
+    // Ensure audio levels are off by default.
+    EXPECT_EQ(0, voe_.GetRTPAudioLevelIndicationStatus(
+        channel_id, enable, id));
+    EXPECT_FALSE(enable);
+
+    // Ensure unknown extensions won't cause an error.
+    extensions.push_back(cricket::RtpHeaderExtension(
+        "urn:ietf:params:unknowextention", 1));
+    EXPECT_TRUE(channel_->SetSendRtpHeaderExtensions(extensions));
+    EXPECT_EQ(0, voe_.GetRTPAudioLevelIndicationStatus(
+        channel_id, enable, id));
+    EXPECT_FALSE(enable);
+
+    // Ensure audio levels stay off with an empty list of headers.
+    EXPECT_TRUE(channel_->SetSendRtpHeaderExtensions(extensions));
+    EXPECT_EQ(0, voe_.GetRTPAudioLevelIndicationStatus(
+        channel_id, enable, id));
+    EXPECT_FALSE(enable);
+
+    // Ensure audio levels are enabled if the audio-level header is specified.
+    extensions.push_back(cricket::RtpHeaderExtension(
+        "urn:ietf:params:rtp-hdrext:ssrc-audio-level", 8));
+    EXPECT_TRUE(channel_->SetSendRtpHeaderExtensions(extensions));
+    EXPECT_EQ(0, voe_.GetRTPAudioLevelIndicationStatus(
+        channel_id, enable, id));
+    EXPECT_TRUE(enable);
+    EXPECT_EQ(8, id);
+
+    // Ensure audio levels go back off with an empty list.
+    extensions.clear();
+    EXPECT_TRUE(channel_->SetSendRtpHeaderExtensions(extensions));
+    EXPECT_EQ(0, voe_.GetRTPAudioLevelIndicationStatus(
+        channel_id, enable, id));
+    EXPECT_FALSE(enable);
+  }
+
  protected:
   cricket::FakeWebRtcVoiceEngine voe_;
   cricket::FakeWebRtcVoiceEngine voe_sc_;
@@ -1336,43 +1389,7 @@
   EXPECT_TRUE(SetupEngine());
   std::vector<cricket::RtpHeaderExtension> extensions;
   int channel_num = voe_.GetLastChannel();
-  bool enable = false;
-  unsigned char id = 0;
-
-  // Ensure audio levels are off by default.
-  EXPECT_EQ(0, voe_.GetRTPAudioLevelIndicationStatus(
-      channel_num, enable, id));
-  EXPECT_FALSE(enable);
-
-  // Ensure unknown extentions won't cause an error.
-  extensions.push_back(cricket::RtpHeaderExtension(
-      "urn:ietf:params:unknowextention", 1));
-  EXPECT_TRUE(channel_->SetSendRtpHeaderExtensions(extensions));
-  EXPECT_EQ(0, voe_.GetRTPAudioLevelIndicationStatus(
-      channel_num, enable, id));
-  EXPECT_FALSE(enable);
-
-  // Ensure audio levels stay off with an empty list of headers.
-  EXPECT_TRUE(channel_->SetSendRtpHeaderExtensions(extensions));
-  EXPECT_EQ(0, voe_.GetRTPAudioLevelIndicationStatus(
-      channel_num, enable, id));
-  EXPECT_FALSE(enable);
-
-  // Ensure audio levels are enabled if the audio-level header is specified.
-  extensions.push_back(cricket::RtpHeaderExtension(
-      "urn:ietf:params:rtp-hdrext:ssrc-audio-level", 8));
-  EXPECT_TRUE(channel_->SetSendRtpHeaderExtensions(extensions));
-  EXPECT_EQ(0, voe_.GetRTPAudioLevelIndicationStatus(
-      channel_num, enable, id));
-  EXPECT_TRUE(enable);
-  EXPECT_EQ(8, id);
-
-  // Ensure audio levels go back off with an empty list.
-  extensions.clear();
-  EXPECT_TRUE(channel_->SetSendRtpHeaderExtensions(extensions));
-  EXPECT_EQ(0, voe_.GetRTPAudioLevelIndicationStatus(
-      channel_num, enable, id));
-  EXPECT_FALSE(enable);
+  TestSetSendRtpHeaderExtensions(channel_num);
 }
 
 // Test that we can create a channel and start sending/playing out on it.
@@ -1392,9 +1409,169 @@
   EXPECT_FALSE(voe_.GetPlayout(channel_num));
 }
 
-// Test that we can add and remove streams, and do proper send/playout.
-// We can receive on multiple streams, but will only send on one.
-TEST_F(WebRtcVoiceEngineTestFake, SendAndPlayoutWithMultipleStreams) {
+// Test that we can add and remove send streams.
+TEST_F(WebRtcVoiceEngineTestFake, CreateAndDeleteMultipleSendStreams) {
+  SetupForMultiSendStream();
+
+  static const uint32 kSsrcs4[] = {1, 2, 3, 4};
+
+  // Set the global state for sending.
+  EXPECT_TRUE(channel_->SetSend(cricket::SEND_MICROPHONE));
+
+  for (unsigned int i = 0; i < ARRAY_SIZE(kSsrcs4); ++i) {
+    EXPECT_TRUE(channel_->AddSendStream(
+        cricket::StreamParams::CreateLegacy(kSsrcs4[i])));
+
+    // Verify that we are in a sending state for all the created streams.
+    int channel_num = voe_.GetChannelFromLocalSsrc(kSsrcs4[i]);
+    EXPECT_TRUE(voe_.GetSend(channel_num));
+  }
+
+  // Remove the first send channel, which is the default channel. It will only
+  // recycle the default channel but not delete it.
+  EXPECT_TRUE(channel_->RemoveSendStream(kSsrcs4[0]));
+  // Stream should already be Removed from the send stream list.
+  EXPECT_FALSE(channel_->RemoveSendStream(kSsrcs4[0]));
+  // But the default still exists.
+  EXPECT_EQ(0, voe_.GetChannelFromLocalSsrc(kSsrcs4[0]));
+
+  // Delete the rest of send channel streams.
+  for (unsigned int i = 1; i < ARRAY_SIZE(kSsrcs4); ++i) {
+    EXPECT_TRUE(channel_->RemoveSendStream(kSsrcs4[i]));
+    // Stream should already be deleted.
+    EXPECT_FALSE(channel_->RemoveSendStream(kSsrcs4[i]));
+    EXPECT_EQ(-1, voe_.GetChannelFromLocalSsrc(kSsrcs4[i]));
+  }
+}
+
+// Test SetSendCodecs correctly configure the codecs in all send streams.
+TEST_F(WebRtcVoiceEngineTestFake, SetSendCodecsWithMultipleSendStreams) {
+  SetupForMultiSendStream();
+
+  static const uint32 kSsrcs4[] = {1, 2, 3, 4};
+  // Create send streams.
+  for (unsigned int i = 0; i < ARRAY_SIZE(kSsrcs4); ++i) {
+    EXPECT_TRUE(channel_->AddSendStream(
+        cricket::StreamParams::CreateLegacy(kSsrcs4[i])));
+  }
+
+  std::vector<cricket::AudioCodec> codecs;
+  // Set ISAC(16K) and CN(16K). VAD should be activated.
+  codecs.push_back(kIsacCodec);
+  codecs.push_back(kCn16000Codec);
+  codecs[1].id = 97;
+  EXPECT_TRUE(channel_->SetSendCodecs(codecs));
+
+  // Verify ISAC and VAD are corrected configured on all send channels.
+  webrtc::CodecInst gcodec;
+  for (unsigned int i = 0; i < ARRAY_SIZE(kSsrcs4); ++i) {
+    int channel_num = voe_.GetChannelFromLocalSsrc(kSsrcs4[i]);
+    EXPECT_EQ(0, voe_.GetSendCodec(channel_num, gcodec));
+    EXPECT_STREQ("ISAC", gcodec.plname);
+    EXPECT_TRUE(voe_.GetVAD(channel_num));
+    EXPECT_EQ(97, voe_.GetSendCNPayloadType(channel_num, true));
+  }
+
+  // Change to PCMU(8K) and CN(16K). VAD should not be activated.
+  codecs[0] = kPcmuCodec;
+  EXPECT_TRUE(channel_->SetSendCodecs(codecs));
+  for (unsigned int i = 0; i < ARRAY_SIZE(kSsrcs4); ++i) {
+    int channel_num = voe_.GetChannelFromLocalSsrc(kSsrcs4[i]);
+    EXPECT_EQ(0, voe_.GetSendCodec(channel_num, gcodec));
+    EXPECT_STREQ("PCMU", gcodec.plname);
+    EXPECT_FALSE(voe_.GetVAD(channel_num));
+  }
+}
+
+// Test we can SetSend on all send streams correctly.
+TEST_F(WebRtcVoiceEngineTestFake, SetSendWithMultipleSendStreams) {
+  SetupForMultiSendStream();
+
+  static const uint32 kSsrcs4[] = {1, 2, 3, 4};
+  // Create the send channels and they should be a SEND_NOTHING date.
+  for (unsigned int i = 0; i < ARRAY_SIZE(kSsrcs4); ++i) {
+    EXPECT_TRUE(channel_->AddSendStream(
+        cricket::StreamParams::CreateLegacy(kSsrcs4[i])));
+    int channel_num = voe_.GetLastChannel();
+    EXPECT_FALSE(voe_.GetSend(channel_num));
+  }
+
+  // Set the global state for starting sending.
+  EXPECT_TRUE(channel_->SetSend(cricket::SEND_MICROPHONE));
+  for (unsigned int i = 0; i < ARRAY_SIZE(kSsrcs4); ++i) {
+    // Verify that we are in a sending state for all the send streams.
+    int channel_num = voe_.GetChannelFromLocalSsrc(kSsrcs4[i]);
+    EXPECT_TRUE(voe_.GetSend(channel_num));
+  }
+
+  // Set the global state for stopping sending.
+  EXPECT_TRUE(channel_->SetSend(cricket::SEND_NOTHING));
+  for (unsigned int i = 1; i < ARRAY_SIZE(kSsrcs4); ++i) {
+    // Verify that we are in a stop state for all the send streams.
+    int channel_num = voe_.GetChannelFromLocalSsrc(kSsrcs4[i]);
+    EXPECT_FALSE(voe_.GetSend(channel_num));
+  }
+}
+
+// Test we can set the correct statistics on all send streams.
+TEST_F(WebRtcVoiceEngineTestFake, GetStatsWithMultipleSendStreams) {
+  SetupForMultiSendStream();
+
+  static const uint32 kSsrcs4[] = {1, 2, 3, 4};
+  // Create send streams.
+  for (unsigned int i = 0; i < ARRAY_SIZE(kSsrcs4); ++i) {
+    EXPECT_TRUE(channel_->AddSendStream(
+        cricket::StreamParams::CreateLegacy(kSsrcs4[i])));
+  }
+
+  // We need send codec to be set to get all stats.
+  std::vector<cricket::AudioCodec> codecs;
+  codecs.push_back(kPcmuCodec);
+  EXPECT_TRUE(channel_->SetSendCodecs(codecs));
+
+  cricket::VoiceMediaInfo info;
+  EXPECT_EQ(true, channel_->GetStats(&info));
+  EXPECT_EQ(static_cast<size_t>(ARRAY_SIZE(kSsrcs4)), info.senders.size());
+
+  // Verify the statistic information is correct.
+  for (unsigned int i = 0; i < ARRAY_SIZE(kSsrcs4); ++i) {
+    EXPECT_EQ(kSsrcs4[i], info.senders[i].ssrc);
+    EXPECT_EQ(kPcmuCodec.name, info.senders[i].codec_name);
+    EXPECT_EQ(cricket::kIntStatValue, info.senders[i].bytes_sent);
+    EXPECT_EQ(cricket::kIntStatValue, info.senders[i].packets_sent);
+    EXPECT_EQ(cricket::kIntStatValue, info.senders[i].packets_lost);
+    EXPECT_EQ(cricket::kFractionLostStatValue, info.senders[i].fraction_lost);
+    EXPECT_EQ(cricket::kIntStatValue, info.senders[i].ext_seqnum);
+    EXPECT_EQ(cricket::kIntStatValue, info.senders[i].rtt_ms);
+    EXPECT_EQ(cricket::kIntStatValue, info.senders[i].jitter_ms);
+  }
+
+  EXPECT_EQ(1u, info.receivers.size());
+}
+
+// Test that we support setting certain send header extensions on multiple
+// send streams.
+TEST_F(WebRtcVoiceEngineTestFake,
+       SetSendRtpHeaderExtensionsWithMultpleSendStreams) {
+  SetupForMultiSendStream();
+
+  static const uint32 kSsrcs4[] = {1, 2, 3, 4};
+  // Create send streams.
+  for (unsigned int i = 0; i < ARRAY_SIZE(kSsrcs4); ++i) {
+    EXPECT_TRUE(channel_->AddSendStream(
+        cricket::StreamParams::CreateLegacy(kSsrcs4[i])));
+  }
+
+  // Test SendRtpHeaderExtensions on each send channel.
+  for (unsigned int i = 0; i < ARRAY_SIZE(kSsrcs4); ++i) {
+    int channel_num = voe_.GetChannelFromLocalSsrc(kSsrcs4[i]);
+    TestSetSendRtpHeaderExtensions(channel_num);
+  }
+}
+
+// Test that we can add and remove receive streams, and do proper send/playout.
+// We can receive on multiple streams while sending one stream.
+TEST_F(WebRtcVoiceEngineTestFake, PlayoutWithMultipleStreams) {
   EXPECT_TRUE(SetupEngine());
   int channel_num1 = voe_.GetLastChannel();
 
diff --git a/talk/p2p/base/sessionmanager.cc b/talk/p2p/base/sessionmanager.cc
index 6b3d60a..8f4ddf2 100644
--- a/talk/p2p/base/sessionmanager.cc
+++ b/talk/p2p/base/sessionmanager.cc
@@ -79,9 +79,16 @@
 
 Session* SessionManager::CreateSession(const std::string& local_name,
                                        const std::string& content_type) {
-  return CreateSession(local_name, local_name,
-                       talk_base::ToString(talk_base::CreateRandomId64()),
-                       content_type, false);
+  std::string id;
+  return CreateSession(id, local_name, content_type);
+}
+
+Session* SessionManager::CreateSession(const std::string& id,
+                                       const std::string& local_name,
+                                       const std::string& content_type) {
+  std::string sid =
+      id.empty() ? talk_base::ToString(talk_base::CreateRandomId64()) : id;
+  return CreateSession(local_name, local_name, sid, content_type, false);
 }
 
 Session* SessionManager::CreateSession(
diff --git a/talk/p2p/base/sessionmanager.h b/talk/p2p/base/sessionmanager.h
index dcdf1ed..d88e050 100644
--- a/talk/p2p/base/sessionmanager.h
+++ b/talk/p2p/base/sessionmanager.h
@@ -92,6 +92,10 @@
   Session *CreateSession(const std::string& local_name,
                          const std::string& content_type);
 
+  Session *CreateSession(const std::string& id,
+                         const std::string& local_name,
+                         const std::string& content_type);
+
   // Destroys the given session.
   void DestroySession(Session *session);
 
diff --git a/talk/session/media/call.cc b/talk/session/media/call.cc
index 7ba6b10..c963c36 100644
--- a/talk/session/media/call.cc
+++ b/talk/session/media/call.cc
@@ -59,6 +59,19 @@
   return (it != map.end()) ? it->second : NULL;
 }
 
+
+bool ContentContainsCrypto(const cricket::ContentInfo* content) {
+  if (content != NULL) {
+    const cricket::MediaContentDescription* desc =
+        static_cast<const cricket::MediaContentDescription*>(
+            content->description);
+    if (!desc || desc->cryptos().empty()) {
+      return false;
+    }
+  }
+  return true;
+}
+
 }
 
 Call::Call(MediaSessionClient* session_client)
@@ -85,22 +98,16 @@
 Session* Call::InitiateSession(const buzz::Jid& to,
                                const buzz::Jid& initiator,
                                const CallOptions& options) {
-  const SessionDescription* offer = session_client_->CreateOffer(options);
+  std::string id;
+  std::string initiator_name = initiator.Str();
+  return InternalInitiateSession(id, to, initiator_name, options);
+}
 
-  Session* session = session_client_->CreateSession(this);
-  session->set_initiator_name(initiator.Str());
-
-  AddSession(session, offer);
-  session->Initiate(to.Str(), offer);
-
-  // After this timeout, terminate the call because the callee isn't
-  // answering
-  session_client_->session_manager()->signaling_thread()->Clear(this,
-      MSG_TERMINATECALL);
-  session_client_->session_manager()->signaling_thread()->PostDelayed(
-    send_to_voicemail_ ? kSendToVoicemailTimeout : kNoVoicemailTimeout,
-    this, MSG_TERMINATECALL);
-  return session;
+Session *Call::InitiateSession(const std::string& id,
+                               const buzz::Jid& to,
+                               const CallOptions& options) {
+  std::string initiator_name;
+  return InternalInitiateSession(id, to, initiator_name, options);
 }
 
 void Call::IncomingSession(Session* session, const SessionDescription* offer) {
@@ -1025,4 +1032,66 @@
   SignalReceivedTerminateReason(this, session, reason);
 }
 
+// TODO(mdodd): Get ride of this method since all Hangouts are using a secure
+// connection.
+bool Call::secure() const {
+  if (session_client_->secure() == SEC_DISABLED) {
+    return false;
+  }
+
+  bool ret = true;
+  int i = 0;
+
+  MediaSessionMap::const_iterator it;
+  for (it = media_session_map_.begin(); it != media_session_map_.end(); ++it) {
+    LOG_F(LS_VERBOSE) << "session[" << i
+                      << "], check local and remote descriptions";
+    i++;
+
+    if (!SessionDescriptionContainsCrypto(
+            it->second.session->local_description()) ||
+        !SessionDescriptionContainsCrypto(
+            it->second.session->remote_description())) {
+      ret = false;
+      break;
+    }
+  }
+
+  LOG_F(LS_VERBOSE) << "secure=" << ret;
+  return ret;
+}
+
+bool Call::SessionDescriptionContainsCrypto(
+    const SessionDescription* sdesc) const {
+  if (sdesc == NULL) {
+    LOG_F(LS_VERBOSE) << "sessionDescription is NULL";
+    return false;
+  }
+
+  return ContentContainsCrypto(sdesc->GetContentByName(CN_AUDIO)) &&
+         ContentContainsCrypto(sdesc->GetContentByName(CN_VIDEO));
+}
+
+Session* Call::InternalInitiateSession(const std::string& id,
+                                       const buzz::Jid& to,
+                                       const std::string& initiator_name,
+                                       const CallOptions& options) {
+  const SessionDescription* offer = session_client_->CreateOffer(options);
+
+  Session* session = session_client_->CreateSession(id, this);
+  session->set_initiator_name(initiator_name);
+
+  AddSession(session, offer);
+  session->Initiate(to.Str(), offer);
+
+  // After this timeout, terminate the call because the callee isn't
+  // answering
+  session_client_->session_manager()->signaling_thread()->Clear(this,
+      MSG_TERMINATECALL);
+  session_client_->session_manager()->signaling_thread()->PostDelayed(
+    send_to_voicemail_ ? kSendToVoicemailTimeout : kNoVoicemailTimeout,
+    this, MSG_TERMINATECALL);
+  return session;
+}
+
 }  // namespace cricket
diff --git a/talk/session/media/call.h b/talk/session/media/call.h
index a604a2b..9b0a6c9 100644
--- a/talk/session/media/call.h
+++ b/talk/session/media/call.h
@@ -66,6 +66,8 @@
   // |initiator| can be empty.
   Session* InitiateSession(const buzz::Jid& to, const buzz::Jid& initiator,
                            const CallOptions& options);
+  Session* InitiateSession(const std::string& id, const buzz::Jid& to,
+                           const CallOptions& options);
   void AcceptSession(Session* session, const CallOptions& options);
   void RejectSession(Session* session);
   void TerminateSession(Session* session);
@@ -100,6 +102,8 @@
   bool has_video() const { return has_video_; }
   bool has_data() const { return has_data_; }
   bool muted() const { return muted_; }
+  bool video() const { return has_video_; }
+  bool secure() const;
   bool video_muted() const { return video_muted_; }
   const std::vector<StreamParams>* GetDataRecvStreams(Session* session) const {
     MediaStreams* recv_streams = GetMediaStreams(session);
@@ -222,6 +226,11 @@
   void ContinuePlayDTMF();
   bool StopScreencastWithoutSendingUpdate(Session* session, uint32 ssrc);
   bool StopAllScreencastsWithoutSendingUpdate(Session* session);
+  bool SessionDescriptionContainsCrypto(const SessionDescription* sdesc) const;
+  Session* InternalInitiateSession(const std::string& id,
+                                   const buzz::Jid& to,
+                                   const std::string& initiator_name,
+                                   const CallOptions& options);
 
   uint32 id_;
   MediaSessionClient* session_client_;
diff --git a/talk/session/media/channelmanager.cc b/talk/session/media/channelmanager.cc
index 88e7f79..c16b066 100644
--- a/talk/session/media/channelmanager.cc
+++ b/talk/session/media/channelmanager.cc
@@ -48,6 +48,7 @@
 #include "talk/media/sctp/sctpdataengine.h"
 #endif
 #include "talk/session/media/soundclip.h"
+#include "talk/session/media/srtpfilter.h"
 
 namespace cricket {
 
@@ -138,8 +139,15 @@
 }
 
 ChannelManager::~ChannelManager() {
-  if (initialized_)
+  if (initialized_) {
     Terminate();
+    // If srtp is initialized (done by the Channel) then we must call
+    // srtp_shutdown to free all crypto kernel lists. But we need to make sure
+    // shutdown always called at the end, after channels are destroyed.
+    // ChannelManager d'tor is always called last, it's safe place to call
+    // shutdown.
+    ShutdownSrtp();
+  }
 }
 
 bool ChannelManager::SetVideoRtxEnabled(bool enable) {
diff --git a/talk/session/media/mediasessionclient.cc b/talk/session/media/mediasessionclient.cc
index 584c342..265906f 100644
--- a/talk/session/media/mediasessionclient.cc
+++ b/talk/session/media/mediasessionclient.cc
@@ -220,8 +220,13 @@
 }
 
 Session *MediaSessionClient::CreateSession(Call *call) {
+  std::string id;
+  return CreateSession(id, call);
+}
+
+Session *MediaSessionClient::CreateSession(const std::string& id, Call* call) {
   const std::string& type = NS_JINGLE_RTP;
-  Session *session = session_manager_->CreateSession(jid().Str(), type);
+  Session *session = session_manager_->CreateSession(id, jid().Str(), type);
   session_map_[session->id()] = call;
   return session;
 }
diff --git a/talk/session/media/mediasessionclient.h b/talk/session/media/mediasessionclient.h
index c76f0e9..1ade753 100644
--- a/talk/session/media/mediasessionclient.h
+++ b/talk/session/media/mediasessionclient.h
@@ -152,6 +152,7 @@
   void OnSessionState(BaseSession *session, BaseSession::State state);
   void OnSessionDestroy(Session *session);
   Session *CreateSession(Call *call);
+  Session *CreateSession(const std::string& id, Call* call);
   Call *FindCallByRemoteName(const std::string &remote_name);
 
   buzz::Jid jid_;
diff --git a/talk/session/media/srtpfilter.cc b/talk/session/media/srtpfilter.cc
index e5104db..8e1c2c1 100644
--- a/talk/session/media/srtpfilter.cc
+++ b/talk/session/media/srtpfilter.cc
@@ -97,6 +97,15 @@
 #endif  // HAVE_SRTP
 }
 
+// NOTE: This is called from ChannelManager D'tor.
+void ShutdownSrtp() {
+#ifdef HAVE_SRTP
+  // If srtp_dealloc is not executed then this will clear all existing sessions.
+  // This should be called when application is shutting down.
+  SrtpSession::Terminate();
+#endif
+}
+
 SrtpFilter::SrtpFilter()
     : state_(ST_INIT),
       signal_silent_time_in_ms_(0) {
@@ -621,6 +630,17 @@
   return true;
 }
 
+void SrtpSession::Terminate() {
+  if (inited_) {
+    int err = srtp_shutdown();
+    if (err) {
+      LOG(LS_ERROR) << "srtp_shutdown failed. err=" << err;
+      return;
+    }
+    inited_ = false;
+  }
+}
+
 void SrtpSession::HandleEvent(const srtp_event_data_t* ev) {
   switch (ev->event) {
     case event_ssrc_collision:
diff --git a/talk/session/media/srtpfilter.h b/talk/session/media/srtpfilter.h
index 7d97eff..9b48dcd 100644
--- a/talk/session/media/srtpfilter.h
+++ b/talk/session/media/srtpfilter.h
@@ -65,6 +65,7 @@
 class SrtpStat;
 
 void EnableSrtpDebugging();
+void ShutdownSrtp();
 
 // Class to transform SRTP to/from RTP.
 // Initialize by calling SetSend with the local security params, then call
@@ -208,6 +209,9 @@
   // Update the silent threshold (in ms) for signaling errors.
   void set_signal_silent_time(uint32 signal_silent_time_in_ms);
 
+  // Calls srtp_shutdown if it's initialized.
+  static void Terminate();
+
   sigslot::repeater3<uint32, SrtpFilter::Mode, SrtpFilter::Error>
       SignalSrtpError;
 
diff --git a/talk/xmpp/constants.cc b/talk/xmpp/constants.cc
index 193ae2b..196a1ec 100644
--- a/talk/xmpp/constants.cc
+++ b/talk/xmpp/constants.cc
@@ -119,6 +119,27 @@
 const char STR_MUC_ROOM_FEATURE_BROADCAST[] = "broadcast";
 const char STR_MUC_ROOM_FEATURE_MULTI_USER_VC[] = "muc_muvc";
 
+const char STR_ID_TYPE_CONVERSATION[] = "conversation";
+const char NS_GOOGLE_MUC_HANGOUT[] = "google:muc#hangout";
+const StaticQName QN_GOOGLE_MUC_HANGOUT_INVITE =
+    { NS_GOOGLE_MUC_HANGOUT, "invite" };
+const StaticQName QN_GOOGLE_MUC_HANGOUT_INVITE_TYPE =
+    { NS_GOOGLE_MUC_HANGOUT, "invite-type" };
+const StaticQName QN_ATTR_CREATE_ACTIVITY =
+    { STR_EMPTY, "create-activity" };
+const StaticQName QN_GOOGLE_MUC_HANGOUT_PUBLIC =
+    { NS_GOOGLE_MUC_HANGOUT, "public" };
+const StaticQName QN_GOOGLE_MUC_HANGOUT_INVITEE =
+    { NS_GOOGLE_MUC_HANGOUT, "invitee" };
+const StaticQName QN_GOOGLE_MUC_HANGOUT_NOTIFICATION_STATUS =
+    { NS_GOOGLE_MUC_HANGOUT, "notification-status" };
+const StaticQName QN_GOOGLE_MUC_HANGOUT_NOTIFICATION_TYPE = {
+    NS_GOOGLE_MUC_HANGOUT, "notification-type" };
+const StaticQName QN_GOOGLE_MUC_HANGOUT_HANGOUT_START_CONTEXT = {
+    NS_GOOGLE_MUC_HANGOUT, "hangout-start-context" };
+const StaticQName QN_GOOGLE_MUC_HANGOUT_CONVERSATION_ID = {
+    NS_GOOGLE_MUC_HANGOUT, "conversation-id" };
+
 const StaticQName QN_STREAM_STREAM = { NS_STREAM, STR_STREAM };
 const StaticQName QN_STREAM_FEATURES = { NS_STREAM, "features" };
 const StaticQName QN_STREAM_ERROR = { NS_STREAM, "error" };
diff --git a/talk/xmpp/constants.h b/talk/xmpp/constants.h
index e01a798..cd6d2b7 100644
--- a/talk/xmpp/constants.h
+++ b/talk/xmpp/constants.h
@@ -112,6 +112,17 @@
 extern const char STR_MUC_ROOM_FEATURE_BROADCAST[];
 extern const char STR_MUC_ROOM_FEATURE_MULTI_USER_VC[];
 
+extern const char STR_ID_TYPE_CONVERSATION[];
+extern const char NS_GOOGLE_MUC_HANGOUT[];
+extern const StaticQName QN_GOOGLE_MUC_HANGOUT_INVITE;
+extern const StaticQName QN_GOOGLE_MUC_HANGOUT_INVITE_TYPE;
+extern const StaticQName QN_ATTR_CREATE_ACTIVITY;
+extern const StaticQName QN_GOOGLE_MUC_HANGOUT_PUBLIC;
+extern const StaticQName QN_GOOGLE_MUC_HANGOUT_INVITEE;
+extern const StaticQName QN_GOOGLE_MUC_HANGOUT_NOTIFICATION_TYPE;
+extern const StaticQName QN_GOOGLE_MUC_HANGOUT_HANGOUT_START_CONTEXT;
+extern const StaticQName QN_GOOGLE_MUC_HANGOUT_CONVERSATION_ID;
+
 extern const StaticQName QN_STREAM_STREAM;
 extern const StaticQName QN_STREAM_FEATURES;
 extern const StaticQName QN_STREAM_ERROR;
diff --git a/talk/xmpp/mucroomdiscoverytask.cc b/talk/xmpp/mucroomdiscoverytask.cc
index e0770fd..a5055d2 100644
--- a/talk/xmpp/mucroomdiscoverytask.cc
+++ b/talk/xmpp/mucroomdiscoverytask.cc
@@ -49,12 +49,20 @@
   std::map<std::string, std::string> extended_info;
   const XmlElement* identity = query->FirstNamed(QN_DISCO_IDENTITY);
   if (identity == NULL || !identity->HasAttr(QN_NAME)) {
-    SignalResult(this, false, "", features, extended_info);
+    SignalResult(this, false, "", "", features, extended_info);
     return;
   }
 
   const std::string name(identity->Attr(QN_NAME));
 
+  // Get the conversation id
+  const XmlElement* convIdElement =
+      identity->FirstNamed(QN_GOOGLE_MUC_HANGOUT_CONVERSATION_ID);
+  std::string conversation_id;
+  if (convIdElement != NULL) {
+    conversation_id = convIdElement->BodyText();
+  }
+
   for (const XmlElement* feature = query->FirstNamed(QN_DISCO_FEATURE);
        feature != NULL; feature = feature->NextNamed(QN_DISCO_FEATURE)) {
     features.insert(feature->Attr(QN_VAR));
@@ -69,7 +77,7 @@
     }
   }
 
-  SignalResult(this, true, name, features, extended_info);
+  SignalResult(this, true, name, conversation_id, features, extended_info);
 }
 
 }  // namespace buzz
diff --git a/talk/xmpp/mucroomdiscoverytask.h b/talk/xmpp/mucroomdiscoverytask.h
index 6e3a21a..4097cc6 100644
--- a/talk/xmpp/mucroomdiscoverytask.h
+++ b/talk/xmpp/mucroomdiscoverytask.h
@@ -41,10 +41,11 @@
   MucRoomDiscoveryTask(XmppTaskParentInterface* parent,
                        const Jid& room_jid);
 
-  // Signal (exists, name, features, extended_info)
-  sigslot::signal5<MucRoomDiscoveryTask*,
+  // Signal (exists, name, conversationId, features, extended_info)
+  sigslot::signal6<MucRoomDiscoveryTask*,
                    bool,
                    const std::string&,
+                   const std::string&,
                    const std::set<std::string>&,
                    const std::map<std::string, std::string>& > SignalResult;
 
diff --git a/talk/xmpp/mucroomdiscoverytask_unittest.cc b/talk/xmpp/mucroomdiscoverytask_unittest.cc
index b88b6f2..354503f 100644
--- a/talk/xmpp/mucroomdiscoverytask_unittest.cc
+++ b/talk/xmpp/mucroomdiscoverytask_unittest.cc
@@ -43,10 +43,12 @@
   void OnResult(buzz::MucRoomDiscoveryTask* task,
                 bool exists,
                 const std::string& name,
+                const std::string& conversation_id,
                 const std::set<std::string>& features,
                 const std::map<std::string, std::string>& extended_info) {
     last_exists = exists;
     last_name = name;
+    last_conversation_id = conversation_id;
     last_features = features;
     last_extended_info = extended_info;
   }
@@ -58,6 +60,7 @@
 
   bool last_exists;
   std::string last_name;
+  std::string last_conversation_id;
   std::set<std::string> last_features;
   std::map<std::string, std::string> last_extended_info;
   int error_count;
@@ -67,7 +70,8 @@
  public:
   MucRoomDiscoveryTaskTest() :
       room_jid("muc-jid-ponies@domain.com"),
-      room_name("ponies") {
+      room_name("ponies"),
+      conversation_id("test_conversation_id") {
   }
 
   virtual void SetUp() {
@@ -87,6 +91,7 @@
   MucRoomDiscoveryListener* listener;
   buzz::Jid room_jid;
   std::string room_name;
+  std::string conversation_id;
 };
 
 TEST_F(MucRoomDiscoveryTaskTest, TestDiscovery) {
@@ -107,12 +112,16 @@
   EXPECT_EQ(expected_iq, xmpp_client->sent_stanzas()[0]->Str());
 
   EXPECT_EQ("", listener->last_name);
+  EXPECT_EQ("", listener->last_conversation_id);
 
   std::string response_iq =
       "<iq xmlns='jabber:client'"
       "    from='muc-jid-ponies@domain.com' id='0' type='result'>"
       "  <info:query xmlns:info='http://jabber.org/protocol/disco#info'>"
-      "    <info:identity name='ponies'/>"
+      "    <info:identity name='ponies'>"
+      "      <han:conversation-id xmlns:han='google:muc#hangout'>"
+      "test_conversation_id</han:conversation-id>"
+      "    </info:identity>"
       "    <info:feature var='feature1'/>"
       "    <info:feature var='feature2'/>"
       "    <data:x xmlns:data='jabber:x:data'>"
@@ -126,6 +135,7 @@
 
   EXPECT_EQ(true, listener->last_exists);
   EXPECT_EQ(room_name, listener->last_name);
+  EXPECT_EQ(conversation_id, listener->last_conversation_id);
   EXPECT_EQ(2U, listener->last_features.size());
   EXPECT_EQ(1U, listener->last_features.count("feature1"));
   EXPECT_EQ(2U, listener->last_extended_info.size());
diff --git a/talk/xmpp/mucroomlookuptask.h b/talk/xmpp/mucroomlookuptask.h
index 60001ff..48f2484 100644
--- a/talk/xmpp/mucroomlookuptask.h
+++ b/talk/xmpp/mucroomlookuptask.h
@@ -46,6 +46,11 @@
 
 class MucRoomLookupTask : public IqTask {
  public:
+  enum IdType {
+    ID_TYPE_CONVERSATION,
+    ID_TYPE_HANGOUT
+  };
+
   static MucRoomLookupTask*
       CreateLookupTaskForRoomName(XmppTaskParentInterface* parent,
                                   const Jid& lookup_server_jid,
diff --git a/webrtc/common_video/common_video.gyp b/webrtc/common_video/common_video.gyp
index 8be60cd..f8b7124 100644
--- a/webrtc/common_video/common_video.gyp
+++ b/webrtc/common_video/common_video.gyp
@@ -54,6 +54,7 @@
       ],
       'sources': [
         'interface/i420_video_frame.h',
+        'interface/texture_video_frame.h',
         'i420_video_frame.cc',
         'jpeg/include/jpeg.h',
         'jpeg/data_manager.cc',
@@ -65,6 +66,7 @@
         'libyuv/scaler.cc',
         'plane.h',
         'plane.cc',
+        'texture_video_frame.cc'
       ],
       # Silence jpeg struct padding warnings.
       'msvs_disabled_warnings': [ 4324, ],
@@ -88,6 +90,7 @@
             'libyuv/libyuv_unittest.cc',
             'libyuv/scaler_unittest.cc',
             'plane_unittest.cc',
+            'texture_video_frame_unittest.cc'
           ],
           # Disable warnings to enable Win64 build, issue 1323.
           'msvs_disabled_warnings': [
diff --git a/webrtc/common_video/i420_video_frame.cc b/webrtc/common_video/i420_video_frame.cc
index 77b7648..e369ffe 100644
--- a/webrtc/common_video/i420_video_frame.cc
+++ b/webrtc/common_video/i420_video_frame.cc
@@ -142,6 +142,8 @@
   v_plane_.ResetSize();
 }
 
+void* I420VideoFrame::native_handle() const { return NULL; }
+
 int I420VideoFrame::CheckDimensions(int width, int height,
                                     int stride_y, int stride_u, int stride_v) {
   int half_width = (width + 1) / 2;
@@ -179,5 +181,4 @@
   return NULL;
 }
 
-
 }  // namespace webrtc
diff --git a/webrtc/common_video/interface/i420_video_frame.h b/webrtc/common_video/interface/i420_video_frame.h
index 5aaf8c0..45f2ec3 100644
--- a/webrtc/common_video/interface/i420_video_frame.h
+++ b/webrtc/common_video/interface/i420_video_frame.h
@@ -16,6 +16,7 @@
 // Storing and handling of YUV (I420) video frames.
 
 #include "webrtc/common_video/plane.h"
+#include "webrtc/system_wrappers/interface/scoped_refptr.h"
 #include "webrtc/typedefs.h"
 
 /*
@@ -49,74 +50,81 @@
   // If required size is bigger than the allocated one, new buffers of adequate
   // size will be allocated.
   // Return value: 0 on success ,-1 on error.
-  int CreateEmptyFrame(int width, int height,
-                       int stride_y, int stride_u, int stride_v);
+  virtual int CreateEmptyFrame(int width, int height,
+                               int stride_y, int stride_u, int stride_v);
 
   // CreateFrame: Sets the frame's members and buffers. If required size is
   // bigger than allocated one, new buffers of adequate size will be allocated.
   // Return value: 0 on success ,-1 on error.
-  int CreateFrame(int size_y, const uint8_t* buffer_y,
-                  int size_u, const uint8_t* buffer_u,
-                  int size_v, const uint8_t* buffer_v,
-                  int width, int height,
-                  int stride_y, int stride_u, int stride_v);
+  virtual int CreateFrame(int size_y, const uint8_t* buffer_y,
+                          int size_u, const uint8_t* buffer_u,
+                          int size_v, const uint8_t* buffer_v,
+                          int width, int height,
+                          int stride_y, int stride_u, int stride_v);
 
   // Copy frame: If required size is bigger than allocated one, new buffers of
   // adequate size will be allocated.
   // Return value: 0 on success ,-1 on error.
-  int CopyFrame(const I420VideoFrame& videoFrame);
+  virtual int CopyFrame(const I420VideoFrame& videoFrame);
 
   // Swap Frame.
-  void SwapFrame(I420VideoFrame* videoFrame);
+  virtual void SwapFrame(I420VideoFrame* videoFrame);
 
   // Get pointer to buffer per plane.
-  uint8_t* buffer(PlaneType type);
+  virtual uint8_t* buffer(PlaneType type);
   // Overloading with const.
-  const uint8_t* buffer(PlaneType type) const;
+  virtual const uint8_t* buffer(PlaneType type) const;
 
   // Get allocated size per plane.
-  int allocated_size(PlaneType type) const;
+  virtual int allocated_size(PlaneType type) const;
 
   // Get allocated stride per plane.
-  int stride(PlaneType type) const;
+  virtual int stride(PlaneType type) const;
 
   // Set frame width.
-  int set_width(int width);
+  virtual int set_width(int width);
 
   // Set frame height.
-  int set_height(int height);
+  virtual int set_height(int height);
 
   // Get frame width.
-  int width() const {return width_;}
+  virtual int width() const {return width_;}
 
   // Get frame height.
-  int height() const {return height_;}
+  virtual int height() const {return height_;}
 
   // Set frame timestamp (90kHz).
-  void set_timestamp(uint32_t timestamp) {timestamp_ = timestamp;}
+  virtual void set_timestamp(uint32_t timestamp) {timestamp_ = timestamp;}
 
   // Get frame timestamp (90kHz).
-  uint32_t timestamp() const {return timestamp_;}
+  virtual uint32_t timestamp() const {return timestamp_;}
 
   // Set render time in miliseconds.
-  void set_render_time_ms(int64_t render_time_ms) {render_time_ms_ =
+  virtual void set_render_time_ms(int64_t render_time_ms) {render_time_ms_ =
                                                    render_time_ms;}
 
   // Get render time in miliseconds.
-  int64_t render_time_ms() const {return render_time_ms_;}
+  virtual int64_t render_time_ms() const {return render_time_ms_;}
 
   // Return true if underlying plane buffers are of zero size, false if not.
-  bool IsZeroSize() const;
+  virtual bool IsZeroSize() const;
 
   // Reset underlying plane buffers sizes to 0. This function doesn't
   // clear memory.
-  void ResetSize();
+  virtual void ResetSize();
+
+  // Return the handle of the underlying video frame. This is used when the
+  // frame is backed by a texture. The object should be destroyed when it is no
+  // longer in use, so the underlying resource can be freed.
+  virtual void* native_handle() const;
+
+ protected:
+  // Verifies legality of parameters.
+  // Return value: 0 on success, -1 on error.
+  virtual int CheckDimensions(int width, int height,
+                              int stride_y, int stride_u, int stride_v);
 
  private:
-  // Verifies legality of parameters.
-  // Return value: 0 on success ,-1 on error.
-  int CheckDimensions(int width, int height,
-                      int stride_y, int stride_u, int stride_v);
   // Get the pointer to a specific plane.
   const Plane* GetPlane(PlaneType type) const;
   // Overloading with non-const.
diff --git a/webrtc/common_video/interface/native_handle.h b/webrtc/common_video/interface/native_handle.h
new file mode 100644
index 0000000..d078d4c
--- /dev/null
+++ b/webrtc/common_video/interface/native_handle.h
@@ -0,0 +1,36 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef COMMON_VIDEO_INTERFACE_NATIVEHANDLE_H_
+#define COMMON_VIDEO_INTERFACE_NATIVEHANDLE_H_
+
+#include "webrtc/typedefs.h"
+
+namespace webrtc {
+
+// A class to store an opaque handle of the underlying video frame. This is used
+// when the frame is backed by a texture. WebRTC carries the handle in
+// TextureVideoFrame. This object keeps a reference to the handle. The reference
+// is cleared when the object is destroyed. It is important to destroy the
+// object as soon as possible so the texture can be recycled.
+class NativeHandle {
+ public:
+  virtual ~NativeHandle() {}
+  // For scoped_refptr
+  virtual int32_t AddRef() = 0;
+  virtual int32_t Release() = 0;
+
+  // Gets the handle.
+  virtual void* GetHandle() = 0;
+};
+
+}  // namespace webrtc
+
+#endif  // COMMON_VIDEO_INTERFACE_NATIVEHANDLE_H_
diff --git a/webrtc/common_video/interface/texture_video_frame.h b/webrtc/common_video/interface/texture_video_frame.h
new file mode 100644
index 0000000..e905ea7
--- /dev/null
+++ b/webrtc/common_video/interface/texture_video_frame.h
@@ -0,0 +1,72 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef COMMON_VIDEO_INTERFACE_TEXTURE_VIDEO_FRAME_H
+#define COMMON_VIDEO_INTERFACE_TEXTURE_VIDEO_FRAME_H
+
+// TextureVideoFrame class
+//
+// Storing and handling of video frames backed by textures.
+
+#include "webrtc/common_video/interface/i420_video_frame.h"
+#include "webrtc/common_video/interface/native_handle.h"
+#include "webrtc/system_wrappers/interface/scoped_refptr.h"
+#include "webrtc/typedefs.h"
+
+namespace webrtc {
+
+class TextureVideoFrame : public I420VideoFrame {
+ public:
+  TextureVideoFrame(NativeHandle* handle,
+                    int width,
+                    int height,
+                    uint32_t timestamp,
+                    int64_t render_time_ms);
+  virtual ~TextureVideoFrame();
+
+  // I420VideoFrame implementation
+  virtual int CreateEmptyFrame(int width,
+                               int height,
+                               int stride_y,
+                               int stride_u,
+                               int stride_v) OVERRIDE;
+  virtual int CreateFrame(int size_y,
+                          const uint8_t* buffer_y,
+                          int size_u,
+                          const uint8_t* buffer_u,
+                          int size_v,
+                          const uint8_t* buffer_v,
+                          int width,
+                          int height,
+                          int stride_y,
+                          int stride_u,
+                          int stride_v) OVERRIDE;
+  virtual int CopyFrame(const I420VideoFrame& videoFrame) OVERRIDE;
+  virtual void SwapFrame(I420VideoFrame* videoFrame) OVERRIDE;
+  virtual uint8_t* buffer(PlaneType type) OVERRIDE;
+  virtual const uint8_t* buffer(PlaneType type) const OVERRIDE;
+  virtual int allocated_size(PlaneType type) const OVERRIDE;
+  virtual int stride(PlaneType type) const OVERRIDE;
+  virtual bool IsZeroSize() const OVERRIDE;
+  virtual void ResetSize() OVERRIDE;
+  virtual void* native_handle() const OVERRIDE;
+
+ protected:
+  virtual int CheckDimensions(
+      int width, int height, int stride_y, int stride_u, int stride_v) OVERRIDE;
+
+ private:
+  // An opaque handle that stores the underlying video frame.
+  scoped_refptr<NativeHandle> handle_;
+};
+
+}  // namespace webrtc
+
+#endif  // COMMON_VIDEO_INTERFACE_TEXTURE_VIDEO_FRAME_H
diff --git a/webrtc/common_video/texture_video_frame.cc b/webrtc/common_video/texture_video_frame.cc
new file mode 100644
index 0000000..ea53dc2
--- /dev/null
+++ b/webrtc/common_video/texture_video_frame.cc
@@ -0,0 +1,108 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "webrtc/common_video/interface/texture_video_frame.h"
+
+#include <assert.h>
+
+#include "webrtc/system_wrappers/interface/trace.h"
+
+#define NOTREACHED() \
+  do { \
+    WEBRTC_TRACE(kTraceError, kTraceVideoRenderer, -1, "Not reached"); \
+    assert(false); \
+  } while (0)
+
+namespace webrtc {
+
+TextureVideoFrame::TextureVideoFrame(NativeHandle* handle,
+                                     int width,
+                                     int height,
+                                     uint32_t timestamp,
+                                     int64_t render_time_ms)
+    : handle_(handle) {
+  set_width(width);
+  set_height(height);
+  set_timestamp(timestamp);
+  set_render_time_ms(render_time_ms);
+}
+
+TextureVideoFrame::~TextureVideoFrame() {}
+
+int TextureVideoFrame::CreateEmptyFrame(int width,
+                                        int height,
+                                        int stride_y,
+                                        int stride_u,
+                                        int stride_v) {
+  NOTREACHED();
+  return -1;
+}
+
+int TextureVideoFrame::CreateFrame(int size_y,
+                                   const uint8_t* buffer_y,
+                                   int size_u,
+                                   const uint8_t* buffer_u,
+                                   int size_v,
+                                   const uint8_t* buffer_v,
+                                   int width,
+                                   int height,
+                                   int stride_y,
+                                   int stride_u,
+                                   int stride_v) {
+  NOTREACHED();
+  return -1;
+}
+
+int TextureVideoFrame::CopyFrame(const I420VideoFrame& videoFrame) {
+  NOTREACHED();
+  return -1;
+}
+
+void TextureVideoFrame::SwapFrame(I420VideoFrame* videoFrame) {
+  NOTREACHED();
+}
+
+uint8_t* TextureVideoFrame::buffer(PlaneType type) {
+  NOTREACHED();
+  return NULL;
+}
+
+const uint8_t* TextureVideoFrame::buffer(PlaneType type) const {
+  NOTREACHED();
+  return NULL;
+}
+
+int TextureVideoFrame::allocated_size(PlaneType type) const {
+  NOTREACHED();
+  return -1;
+}
+
+int TextureVideoFrame::stride(PlaneType type) const {
+  NOTREACHED();
+  return -1;
+}
+
+bool TextureVideoFrame::IsZeroSize() const {
+  NOTREACHED();
+  return true;
+}
+
+void TextureVideoFrame::ResetSize() {
+  NOTREACHED();
+}
+
+void* TextureVideoFrame::native_handle() const { return handle_.get(); }
+
+int TextureVideoFrame::CheckDimensions(
+    int width, int height, int stride_y, int stride_u, int stride_v) {
+  return 0;
+}
+
+}  // namespace webrtc
diff --git a/webrtc/common_video/texture_video_frame_unittest.cc b/webrtc/common_video/texture_video_frame_unittest.cc
new file mode 100644
index 0000000..04e09a6
--- /dev/null
+++ b/webrtc/common_video/texture_video_frame_unittest.cc
@@ -0,0 +1,58 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "testing/gtest/include/gtest/gtest.h"
+#include "webrtc/common_video/interface/native_handle.h"
+#include "webrtc/common_video/interface/texture_video_frame.h"
+
+namespace webrtc {
+
+class NativeHandleImpl : public NativeHandle {
+ public:
+  NativeHandleImpl() : ref_count_(0) {}
+  virtual ~NativeHandleImpl() {}
+  virtual int32_t AddRef() { return ++ref_count_; }
+  virtual int32_t Release() { return --ref_count_; }
+  virtual void* GetHandle() { return NULL; }
+
+  int32_t ref_count() { return ref_count_; }
+ private:
+  int32_t ref_count_;
+};
+
+TEST(TestTextureVideoFrame, InitialValues) {
+  NativeHandleImpl handle;
+  TextureVideoFrame frame(&handle, 640, 480, 100, 10);
+  EXPECT_EQ(640, frame.width());
+  EXPECT_EQ(480, frame.height());
+  EXPECT_EQ(100u, frame.timestamp());
+  EXPECT_EQ(10, frame.render_time_ms());
+  EXPECT_EQ(&handle, frame.native_handle());
+
+  EXPECT_EQ(0, frame.set_width(320));
+  EXPECT_EQ(320, frame.width());
+  EXPECT_EQ(0, frame.set_height(240));
+  EXPECT_EQ(240, frame.height());
+  frame.set_timestamp(200);
+  EXPECT_EQ(200u, frame.timestamp());
+  frame.set_render_time_ms(20);
+  EXPECT_EQ(20, frame.render_time_ms());
+}
+
+TEST(TestTextureVideoFrame, RefCount) {
+  NativeHandleImpl handle;
+  EXPECT_EQ(0, handle.ref_count());
+  TextureVideoFrame *frame = new TextureVideoFrame(&handle, 640, 480, 100, 200);
+  EXPECT_EQ(1, handle.ref_count());
+  delete frame;
+  EXPECT_EQ(0, handle.ref_count());
+}
+
+}  // namespace webrtc
diff --git a/webrtc/modules/utility/source/video_frames_queue.cc b/webrtc/modules/utility/source/video_frames_queue.cc
index 535660c..d3d37be 100644
--- a/webrtc/modules/utility/source/video_frames_queue.cc
+++ b/webrtc/modules/utility/source/video_frames_queue.cc
@@ -14,6 +14,7 @@
 
 #include <assert.h>
 
+#include "webrtc/common_video/interface/texture_video_frame.h"
 #include "webrtc/modules/interface/module_common_types.h"
 #include "webrtc/system_wrappers/interface/tick_util.h"
 #include "webrtc/system_wrappers/interface/trace.h"
@@ -48,6 +49,16 @@
 }
 
 int32_t VideoFramesQueue::AddFrame(const I420VideoFrame& newFrame) {
+  if (newFrame.native_handle() != NULL) {
+    _incomingFrames.PushBack(new TextureVideoFrame(
+        static_cast<NativeHandle*>(newFrame.native_handle()),
+        newFrame.width(),
+        newFrame.height(),
+        newFrame.timestamp(),
+        newFrame.render_time_ms()));
+    return 0;
+  }
+
   I420VideoFrame* ptrFrameToAdd = NULL;
   // Try to re-use a VideoFrame. Only allocate new memory if it is necessary.
   if (!_emptyFrames.Empty()) {
@@ -113,12 +124,17 @@
 }
 
 int32_t VideoFramesQueue::ReturnFrame(I420VideoFrame* ptrOldFrame) {
-  ptrOldFrame->set_timestamp(0);
-  ptrOldFrame->set_width(0);
-  ptrOldFrame->set_height(0);
-  ptrOldFrame->set_render_time_ms(0);
-  ptrOldFrame->ResetSize();
-  _emptyFrames.PushBack(ptrOldFrame);
+  // No need to reuse texture frames because they do not allocate memory.
+  if (ptrOldFrame->native_handle() == NULL) {
+    ptrOldFrame->set_timestamp(0);
+    ptrOldFrame->set_width(0);
+    ptrOldFrame->set_height(0);
+    ptrOldFrame->set_render_time_ms(0);
+    ptrOldFrame->ResetSize();
+    _emptyFrames.PushBack(ptrOldFrame);
+  } else {
+    delete ptrOldFrame;
+  }
   return 0;
 }
 
diff --git a/webrtc/modules/video_render/incoming_video_stream.cc b/webrtc/modules/video_render/incoming_video_stream.cc
index eb602d1..39556d8 100644
--- a/webrtc/modules/video_render/incoming_video_stream.cc
+++ b/webrtc/modules/video_render/incoming_video_stream.cc
@@ -101,7 +101,8 @@
     return -1;
   }
 
-  if (true == mirror_frames_enabled_) {
+  // Mirroring is not supported if the frame is backed by a texture.
+  if (true == mirror_frames_enabled_ && video_frame.native_handle() == NULL) {
     transformed_video_frame_.CreateEmptyFrame(video_frame.width(),
                                               video_frame.height(),
                                               video_frame.stride(kYPlane),
diff --git a/webrtc/modules/video_render/video_render_frames.cc b/webrtc/modules/video_render/video_render_frames.cc
index 80b3d59..be5cac9 100644
--- a/webrtc/modules/video_render/video_render_frames.cc
+++ b/webrtc/modules/video_render/video_render_frames.cc
@@ -12,6 +12,7 @@
 
 #include <assert.h>
 
+#include "webrtc/common_video/interface/texture_video_frame.h"
 #include "webrtc/modules/interface/module_common_types.h"
 #include "webrtc/system_wrappers/interface/tick_util.h"
 #include "webrtc/system_wrappers/interface/trace.h"
@@ -47,6 +48,16 @@
     return -1;
   }
 
+  if (new_frame->native_handle() != NULL) {
+    incoming_frames_.PushBack(new TextureVideoFrame(
+        static_cast<NativeHandle*>(new_frame->native_handle()),
+        new_frame->width(),
+        new_frame->height(),
+        new_frame->timestamp(),
+        new_frame->render_time_ms()));
+    return incoming_frames_.GetSize();
+  }
+
   // Get an empty frame
   I420VideoFrame* frame_to_add = NULL;
   if (!empty_frames_.Empty()) {
@@ -103,10 +114,7 @@
         // This is the oldest one so far and it's OK to render.
         if (render_frame) {
           // This one is older than the newly found frame, remove this one.
-          render_frame->ResetSize();
-          render_frame->set_timestamp(0);
-          render_frame->set_render_time_ms(0);
-          empty_frames_.PushFront(render_frame);
+          ReturnFrame(render_frame);
         }
         render_frame = oldest_frame_in_list;
         incoming_frames_.Erase(item);
@@ -122,10 +130,15 @@
 }
 
 int32_t VideoRenderFrames::ReturnFrame(I420VideoFrame* old_frame) {
-  old_frame->ResetSize();
-  old_frame->set_timestamp(0);
-  old_frame->set_render_time_ms(0);
-  empty_frames_.PushBack(old_frame);
+  // No need to reuse texture frames because they do not allocate memory.
+  if (old_frame->native_handle() == NULL) {
+    old_frame->ResetSize();
+    old_frame->set_timestamp(0);
+    old_frame->set_render_time_ms(0);
+    empty_frames_.PushBack(old_frame);
+  } else {
+    delete old_frame;
+  }
   return 0;
 }
 
diff --git a/webrtc/video_engine/include/vie_render.h b/webrtc/video_engine/include/vie_render.h
index 24e5926..48afc1a 100644
--- a/webrtc/video_engine/include/vie_render.h
+++ b/webrtc/video_engine/include/vie_render.h
@@ -39,7 +39,13 @@
                            // RTP timestamp in 90kHz.
                            uint32_t time_stamp,
                            // Wallclock render time in miliseconds
-                           int64_t render_time) = 0;
+                           int64_t render_time,
+                           // Handle of the underlying video frame,
+                           void* handle) = 0;
+
+  // Returns true if the renderer supports textures. DeliverFrame can be called
+  // with NULL |buffer| and non-NULL |handle|.
+  virtual bool IsTextureSupported() = 0;
 
  protected:
   virtual ~ExternalRenderer() {}
diff --git a/webrtc/video_engine/internal/video_receive_stream.cc b/webrtc/video_engine/internal/video_receive_stream.cc
index 50f4553..6f23e9c 100644
--- a/webrtc/video_engine/internal/video_receive_stream.cc
+++ b/webrtc/video_engine/internal/video_receive_stream.cc
@@ -117,7 +117,8 @@
 }
 
 int VideoReceiveStream::DeliverFrame(uint8_t* frame, int buffer_size,
-                                     uint32_t timestamp, int64_t render_time) {
+                                     uint32_t timestamp, int64_t render_time,
+                                     void* /*handle*/) {
   if (config_.renderer == NULL) {
     return 0;
   }
@@ -142,6 +143,8 @@
   return 0;
 }
 
+bool VideoReceiveStream::IsTextureSupported() { return false; }
+
 int VideoReceiveStream::SendPacket(int /*channel*/,
                                    const void* packet,
                                    int length) {
diff --git a/webrtc/video_engine/internal/video_receive_stream.h b/webrtc/video_engine/internal/video_receive_stream.h
index 932776a..cdac6fb 100644
--- a/webrtc/video_engine/internal/video_receive_stream.h
+++ b/webrtc/video_engine/internal/video_receive_stream.h
@@ -46,7 +46,9 @@
   virtual int FrameSizeChange(unsigned int width, unsigned int height,
                               unsigned int /*number_of_streams*/) OVERRIDE;
   virtual int DeliverFrame(uint8_t* frame, int buffer_size, uint32_t timestamp,
-                           int64_t render_time) OVERRIDE;
+                           int64_t render_time, void* /*handle*/) OVERRIDE;
+
+  virtual bool IsTextureSupported() OVERRIDE;
 
   virtual int SendPacket(int /*channel*/, const void* packet, int length)
       OVERRIDE;
diff --git a/webrtc/video_engine/test/auto_test/primitives/framedrop_primitives.cc b/webrtc/video_engine/test/auto_test/primitives/framedrop_primitives.cc
index e49be53..a79f7d5 100644
--- a/webrtc/video_engine/test/auto_test/primitives/framedrop_primitives.cc
+++ b/webrtc/video_engine/test/auto_test/primitives/framedrop_primitives.cc
@@ -588,7 +588,7 @@
 
 int FrameDropMonitoringRemoteFileRenderer::DeliverFrame(
     unsigned char *buffer, int buffer_size, uint32_t time_stamp,
-    int64_t render_time) {
+    int64_t render_time, void* /*handle*/) {
   // |render_time| provides the ideal render time for this frame. If that time
   // has already passed we will render it immediately.
   int64_t report_render_time_us = render_time * 1000;
@@ -600,7 +600,7 @@
   frame_drop_detector_->ReportFrameState(FrameDropDetector::kRendered,
                                          time_stamp, report_render_time_us);
   return ViEToFileRenderer::DeliverFrame(buffer, buffer_size,
-                                         time_stamp, render_time);
+                                         time_stamp, render_time, NULL);
 }
 
 int FrameDropMonitoringRemoteFileRenderer::FrameSizeChange(
diff --git a/webrtc/video_engine/test/auto_test/primitives/framedrop_primitives.h b/webrtc/video_engine/test/auto_test/primitives/framedrop_primitives.h
index 3a60520..b507784 100644
--- a/webrtc/video_engine/test/auto_test/primitives/framedrop_primitives.h
+++ b/webrtc/video_engine/test/auto_test/primitives/framedrop_primitives.h
@@ -223,10 +223,11 @@
 
   // Implementation of ExternalRenderer:
   int FrameSizeChange(unsigned int width, unsigned int height,
-                      unsigned int number_of_streams);
+                      unsigned int number_of_streams) OVERRIDE;
   int DeliverFrame(unsigned char* buffer, int buffer_size,
                    uint32_t time_stamp,
-                   int64_t render_time);
+                   int64_t render_time,
+                   void* handle) OVERRIDE;
  private:
   FrameDropDetector* frame_drop_detector_;
 };
diff --git a/webrtc/video_engine/test/auto_test/source/vie_autotest_render.cc b/webrtc/video_engine/test/auto_test/source/vie_autotest_render.cc
index c4b8155..c1d2fac 100644
--- a/webrtc/video_engine/test/auto_test/source/vie_autotest_render.cc
+++ b/webrtc/video_engine/test/auto_test/source/vie_autotest_render.cc
@@ -58,7 +58,8 @@
 
     virtual int DeliverFrame(unsigned char* buffer, int bufferSize,
                              uint32_t time_stamp,
-                             int64_t render_time) {
+                             int64_t render_time,
+                             void* /*handle*/) {
       if (bufferSize != CalcBufferSize(webrtc::kI420, _width, _height)) {
         ViETest::Log("Incorrect render buffer received, of length = %d\n",
                      bufferSize);
@@ -67,6 +68,8 @@
       return 0;
     }
 
+    virtual bool IsTextureSupported() { return false; }
+
 public:
     virtual ~ViEAutoTestExternalRenderer()
     {
diff --git a/webrtc/video_engine/test/libvietest/helpers/vie_to_file_renderer.cc b/webrtc/video_engine/test/libvietest/helpers/vie_to_file_renderer.cc
index a70d6c9..245ddfe 100644
--- a/webrtc/video_engine/test/libvietest/helpers/vie_to_file_renderer.cc
+++ b/webrtc/video_engine/test/libvietest/helpers/vie_to_file_renderer.cc
@@ -123,7 +123,8 @@
 int ViEToFileRenderer::DeliverFrame(unsigned char *buffer,
                                     int buffer_size,
                                     uint32_t time_stamp,
-                                    int64_t render_time) {
+                                    int64_t render_time,
+                                    void* /*handle*/) {
   webrtc::CriticalSectionScoped lock(frame_queue_cs_.get());
   test::Frame* frame;
   if (free_frame_queue_.empty()) {
@@ -146,6 +147,8 @@
   return 0;
 }
 
+bool ViEToFileRenderer::IsTextureSupported() { return false; }
+
 int ViEToFileRenderer::FrameSizeChange(unsigned int width,
                                        unsigned int height,
                                        unsigned int number_of_streams) {
diff --git a/webrtc/video_engine/test/libvietest/include/vie_external_render_filter.h b/webrtc/video_engine/test/libvietest/include/vie_external_render_filter.h
index a1aeb4c..f337d17 100644
--- a/webrtc/video_engine/test/libvietest/include/vie_external_render_filter.h
+++ b/webrtc/video_engine/test/libvietest/include/vie_external_render_filter.h
@@ -35,7 +35,8 @@
     return renderer_->DeliverFrame(frame_buffer,
                                    size,
                                    time_stamp90KHz,
-                                   webrtc::TickTime::MillisecondTimestamp());
+                                   webrtc::TickTime::MillisecondTimestamp(),
+                                   NULL);
   }
 
  private:
diff --git a/webrtc/video_engine/test/libvietest/include/vie_to_file_renderer.h b/webrtc/video_engine/test/libvietest/include/vie_to_file_renderer.h
index 32ee1c1..393524a 100644
--- a/webrtc/video_engine/test/libvietest/include/vie_to_file_renderer.h
+++ b/webrtc/video_engine/test/libvietest/include/vie_to_file_renderer.h
@@ -55,12 +55,15 @@
 
   // Implementation of ExternalRenderer:
   int FrameSizeChange(unsigned int width, unsigned int height,
-                      unsigned int number_of_streams);
+                      unsigned int number_of_streams) OVERRIDE;
 
   int DeliverFrame(unsigned char* buffer,
                    int buffer_size,
                    uint32_t time_stamp,
-                   int64_t render_time);
+                   int64_t render_time,
+                   void* handle) OVERRIDE;
+
+  bool IsTextureSupported() OVERRIDE;
 
   const std::string GetFullOutputPath() const;
 
diff --git a/webrtc/video_engine/vie_channel.cc b/webrtc/video_engine/vie_channel.cc
index 78a9015..7184777 100644
--- a/webrtc/video_engine/vie_channel.cc
+++ b/webrtc/video_engine/vie_channel.cc
@@ -1684,18 +1684,21 @@
     }
     decoder_reset_ = false;
   }
-  if (effect_filter_) {
-    unsigned int length = CalcBufferSize(kI420,
-                                         video_frame.width(),
-                                         video_frame.height());
-    scoped_array<uint8_t> video_buffer(new uint8_t[length]);
-    ExtractBuffer(video_frame, length, video_buffer.get());
-    effect_filter_->Transform(length, video_buffer.get(),
-                              video_frame.timestamp(), video_frame.width(),
-                              video_frame.height());
-  }
-  if (color_enhancement_) {
-    VideoProcessingModule::ColorEnhancement(&video_frame);
+  // Post processing is not supported if the frame is backed by a texture.
+  if (video_frame.native_handle() == NULL) {
+    if (effect_filter_) {
+      unsigned int length = CalcBufferSize(kI420,
+                                           video_frame.width(),
+                                           video_frame.height());
+      scoped_array<uint8_t> video_buffer(new uint8_t[length]);
+      ExtractBuffer(video_frame, length, video_buffer.get());
+      effect_filter_->Transform(length, video_buffer.get(),
+                                video_frame.timestamp(), video_frame.width(),
+                                video_frame.height());
+    }
+    if (color_enhancement_) {
+      VideoProcessingModule::ColorEnhancement(&video_frame);
+    }
   }
 
   uint32_t arr_ofCSRC[kRtpCsrcSize];
diff --git a/webrtc/video_engine/vie_frame_provider_base.cc b/webrtc/video_engine/vie_frame_provider_base.cc
index ac05841..1ed0966 100644
--- a/webrtc/video_engine/vie_frame_provider_base.cc
+++ b/webrtc/video_engine/vie_frame_provider_base.cc
@@ -56,7 +56,7 @@
 
   // Deliver the frame to all registered callbacks.
   if (frame_callbacks_.size() > 0) {
-    if (frame_callbacks_.size() == 1) {
+    if (frame_callbacks_.size() == 1 || video_frame->native_handle() != NULL) {
       // We don't have to copy the frame.
       frame_callbacks_.front()->DeliverFrame(id_, video_frame, num_csrcs, CSRC);
     } else {
diff --git a/webrtc/video_engine/vie_renderer.cc b/webrtc/video_engine/vie_renderer.cc
index 597f49d..35c68aa 100644
--- a/webrtc/video_engine/vie_renderer.cc
+++ b/webrtc/video_engine/vie_renderer.cc
@@ -169,6 +169,21 @@
 int32_t ViEExternalRendererImpl::RenderFrame(
     const uint32_t stream_id,
     I420VideoFrame&   video_frame) {
+  if (video_frame.native_handle() != NULL) {
+    NotifyFrameSizeChange(stream_id, video_frame);
+
+    if (external_renderer_->IsTextureSupported()) {
+      external_renderer_->DeliverFrame(NULL,
+                                       0,
+                                       video_frame.timestamp(),
+                                       video_frame.render_time_ms(),
+                                       video_frame.native_handle());
+    } else {
+      // TODO(wuchengli): readback the pixels and deliver the frame.
+    }
+    return 0;
+  }
+
   VideoFrame* out_frame = converted_frame_.get();
 
   // Convert to requested format.
@@ -218,21 +233,28 @@
       break;
   }
 
-  if (external_renderer_width_ != video_frame.width() ||
-      external_renderer_height_ != video_frame.height()) {
-    external_renderer_width_ = video_frame.width();
-    external_renderer_height_ = video_frame.height();
-    external_renderer_->FrameSizeChange(external_renderer_width_,
-                                        external_renderer_height_, stream_id);
-  }
+  NotifyFrameSizeChange(stream_id, video_frame);
 
   if (out_frame) {
     external_renderer_->DeliverFrame(out_frame->Buffer(),
                                      out_frame->Length(),
                                      video_frame.timestamp(),
-                                     video_frame.render_time_ms());
+                                     video_frame.render_time_ms(),
+                                     NULL);
   }
   return 0;
 }
 
+void ViEExternalRendererImpl::NotifyFrameSizeChange(
+    const uint32_t stream_id,
+    I420VideoFrame& video_frame) {
+  if (external_renderer_width_ != video_frame.width() ||
+      external_renderer_height_ != video_frame.height()) {
+    external_renderer_width_ = video_frame.width();
+    external_renderer_height_ = video_frame.height();
+    external_renderer_->FrameSizeChange(
+        external_renderer_width_, external_renderer_height_, stream_id);
+  }
+}
+
 }  // namespace webrtc
diff --git a/webrtc/video_engine/vie_renderer.h b/webrtc/video_engine/vie_renderer.h
index a4a1e22..04295f7 100644
--- a/webrtc/video_engine/vie_renderer.h
+++ b/webrtc/video_engine/vie_renderer.h
@@ -36,6 +36,8 @@
                               I420VideoFrame& video_frame);
 
  private:
+  void NotifyFrameSizeChange(const uint32_t stream_id,
+                             I420VideoFrame& video_frame);
   ExternalRenderer* external_renderer_;
   RawVideoType external_renderer_format_;
   int external_renderer_width_;