modules/video_capture/test/video_capture_unittest.cc - src - Git at Google

 /*
  *  Copyright (c) 2012 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 <stdio.h>

 #include <map>
 #include <memory>
 #include <sstream>

 #include "absl/memory/memory.h"
 #include "api/scoped_refptr.h"
 #include "api/video/i420_buffer.h"
 #include "api/video/video_frame.h"
 #include "common_video/libyuv/include/webrtc_libyuv.h"
 #include "modules/utility/include/process_thread.h"
 #include "modules/video_capture/video_capture.h"
 #include "modules/video_capture/video_capture_factory.h"
 #include "rtc_base/critical_section.h"
 #include "rtc_base/time_utils.h"
 #include "system_wrappers/include/sleep.h"
 #include "test/frame_utils.h"
 #include "test/gtest.h"

 using webrtc::SleepMs;
 using webrtc::VideoCaptureCapability;
 using webrtc::VideoCaptureFactory;
 using webrtc::VideoCaptureModule;

 #define WAIT_(ex, timeout, res)                           \
   do {                                                    \
     res = (ex);                                           \
     int64_t start = rtc::TimeMillis();                    \
     while (!res && rtc::TimeMillis() < start + timeout) { \
       SleepMs(5);                                         \
       res = (ex);                                         \
     }                                                     \
   } while (0)

 #define EXPECT_TRUE_WAIT(ex, timeout) \
   do {                                \
     bool res;                         \
     WAIT_(ex, timeout, res);          \
     if (!res)                         \
       EXPECT_TRUE(ex);                \
   } while (0)

 static const int kTimeOut = 5000;
 #ifdef WEBRTC_MAC
 static const int kTestHeight = 288;
 static const int kTestWidth = 352;
 static const int kTestFramerate = 30;
 #endif

 class TestVideoCaptureCallback
     : public rtc::VideoSinkInterface<webrtc::VideoFrame> {
  public:
   TestVideoCaptureCallback()
       : last_render_time_ms_(0),
         incoming_frames_(0),
         timing_warnings_(0),
         rotate_frame_(webrtc::kVideoRotation_0) {}

   ~TestVideoCaptureCallback() override {
     if (timing_warnings_ > 0)
       printf("No of timing warnings %d\n", timing_warnings_);
   }

   void OnFrame(const webrtc::VideoFrame& videoFrame) override {
     rtc::CritScope cs(&capture_cs_);
     int height = videoFrame.height();
     int width = videoFrame.width();
 #if defined(WEBRTC_ANDROID) && WEBRTC_ANDROID
     // Android camera frames may be rotated depending on test device
     // orientation.
     EXPECT_TRUE(height == capability_.height || height == capability_.width);
     EXPECT_TRUE(width == capability_.width || width == capability_.height);
 #else
     EXPECT_EQ(height, capability_.height);
     EXPECT_EQ(width, capability_.width);
     EXPECT_EQ(rotate_frame_, videoFrame.rotation());
 #endif
     // RenderTimstamp should be the time now.
     EXPECT_TRUE(videoFrame.render_time_ms() >= rtc::TimeMillis() - 30 &&
                 videoFrame.render_time_ms() <= rtc::TimeMillis());

     if ((videoFrame.render_time_ms() >
              last_render_time_ms_ + (1000 * 1.1) / capability_.maxFPS &&
          last_render_time_ms_ > 0) ||
         (videoFrame.render_time_ms() <
              last_render_time_ms_ + (1000 * 0.9) / capability_.maxFPS &&
          last_render_time_ms_ > 0)) {
       timing_warnings_++;
     }

     incoming_frames_++;
     last_render_time_ms_ = videoFrame.render_time_ms();
     last_frame_ = videoFrame.video_frame_buffer();
   }

   void SetExpectedCapability(VideoCaptureCapability capability) {
     rtc::CritScope cs(&capture_cs_);
     capability_ = capability;
     incoming_frames_ = 0;
     last_render_time_ms_ = 0;
   }
   int incoming_frames() {
     rtc::CritScope cs(&capture_cs_);
     return incoming_frames_;
   }

   int timing_warnings() {
     rtc::CritScope cs(&capture_cs_);
     return timing_warnings_;
   }
   VideoCaptureCapability capability() {
     rtc::CritScope cs(&capture_cs_);
     return capability_;
   }

   bool CompareLastFrame(const webrtc::VideoFrame& frame) {
     rtc::CritScope cs(&capture_cs_);
     return webrtc::test::FrameBufsEqual(last_frame_,
                                         frame.video_frame_buffer());
   }

   void SetExpectedCaptureRotation(webrtc::VideoRotation rotation) {
     rtc::CritScope cs(&capture_cs_);
     rotate_frame_ = rotation;
   }

  private:
   rtc::CriticalSection capture_cs_;
   VideoCaptureCapability capability_;
   int64_t last_render_time_ms_;
   int incoming_frames_;
   int timing_warnings_;
   rtc::scoped_refptr<webrtc::VideoFrameBuffer> last_frame_;
   webrtc::VideoRotation rotate_frame_;
 };

 class VideoCaptureTest : public ::testing::Test {
  public:
   VideoCaptureTest() : number_of_devices_(0) {}

   void SetUp() override {
     device_info_.reset(VideoCaptureFactory::CreateDeviceInfo());
     assert(device_info_.get());
     number_of_devices_ = device_info_->NumberOfDevices();
     ASSERT_GT(number_of_devices_, 0u);
   }

   rtc::scoped_refptr<VideoCaptureModule> OpenVideoCaptureDevice(
       unsigned int device,
       rtc::VideoSinkInterface<webrtc::VideoFrame>* callback) {
     char device_name[256];
     char unique_name[256];

     EXPECT_EQ(0, device_info_->GetDeviceName(device, device_name, 256,
                                              unique_name, 256));

     rtc::scoped_refptr<VideoCaptureModule> module(
         VideoCaptureFactory::Create(unique_name));
     if (module.get() == NULL)
       return NULL;

     EXPECT_FALSE(module->CaptureStarted());

     module->RegisterCaptureDataCallback(callback);
     return module;
   }

   void StartCapture(VideoCaptureModule* capture_module,
                     VideoCaptureCapability capability) {
     ASSERT_EQ(0, capture_module->StartCapture(capability));
     EXPECT_TRUE(capture_module->CaptureStarted());

     VideoCaptureCapability resulting_capability;
     EXPECT_EQ(0, capture_module->CaptureSettings(resulting_capability));
     EXPECT_EQ(capability.width, resulting_capability.width);
     EXPECT_EQ(capability.height, resulting_capability.height);
   }

   std::unique_ptr<VideoCaptureModule::DeviceInfo> device_info_;
   unsigned int number_of_devices_;
 };

 #ifdef WEBRTC_MAC
 // Currently fails on Mac 64-bit, see
 // https://bugs.chromium.org/p/webrtc/issues/detail?id=5406
 #define MAYBE_CreateDelete DISABLED_CreateDelete
 #else
 #define MAYBE_CreateDelete CreateDelete
 #endif
 TEST_F(VideoCaptureTest, MAYBE_CreateDelete) {
   for (int i = 0; i < 5; ++i) {
     int64_t start_time = rtc::TimeMillis();
     TestVideoCaptureCallback capture_observer;
     rtc::scoped_refptr<VideoCaptureModule> module(
         OpenVideoCaptureDevice(0, &capture_observer));
     ASSERT_TRUE(module.get() != NULL);

     VideoCaptureCapability capability;
 #ifndef WEBRTC_MAC
     device_info_->GetCapability(module->CurrentDeviceName(), 0, capability);
 #else
     capability.width = kTestWidth;
     capability.height = kTestHeight;
     capability.maxFPS = kTestFramerate;
     capability.videoType = webrtc::VideoType::kUnknown;
 #endif
     capture_observer.SetExpectedCapability(capability);
     ASSERT_NO_FATAL_FAILURE(StartCapture(module.get(), capability));

     // Less than 4s to start the camera.
     EXPECT_LE(rtc::TimeMillis() - start_time, 4000);

     // Make sure 5 frames are captured.
     EXPECT_TRUE_WAIT(capture_observer.incoming_frames() >= 5, kTimeOut);

     int64_t stop_time = rtc::TimeMillis();
     EXPECT_EQ(0, module->StopCapture());
     EXPECT_FALSE(module->CaptureStarted());

     // Less than 3s to stop the camera.
     EXPECT_LE(rtc::TimeMillis() - stop_time, 3000);
   }
 }

 #ifdef WEBRTC_MAC
 // Currently fails on Mac 64-bit, see
 // https://bugs.chromium.org/p/webrtc/issues/detail?id=5406
 #define MAYBE_Capabilities DISABLED_Capabilities
 #else
 #define MAYBE_Capabilities Capabilities
 #endif
 TEST_F(VideoCaptureTest, MAYBE_Capabilities) {
 #ifdef WEBRTC_MAC
   printf("Video capture capabilities are not supported on Mac.\n");
   return;
 #endif

   TestVideoCaptureCallback capture_observer;

   rtc::scoped_refptr<VideoCaptureModule> module(
       OpenVideoCaptureDevice(0, &capture_observer));
   ASSERT_TRUE(module.get() != NULL);

   int number_of_capabilities =
       device_info_->NumberOfCapabilities(module->CurrentDeviceName());
   EXPECT_GT(number_of_capabilities, 0);
   // Key is <width>x<height>, value is vector of maxFPS values at that
   // resolution.
   typedef std::map<std::string, std::vector<int> > FrameRatesByResolution;
   FrameRatesByResolution frame_rates_by_resolution;
   for (int i = 0; i < number_of_capabilities; ++i) {
     VideoCaptureCapability capability;
     EXPECT_EQ(0, device_info_->GetCapability(module->CurrentDeviceName(), i,
                                              capability));
     std::ostringstream resolutionStream;
     resolutionStream << capability.width << "x" << capability.height;
     resolutionStream.flush();
     std::string resolution = resolutionStream.str();
     frame_rates_by_resolution[resolution].push_back(capability.maxFPS);

     // Since Android presents so many resolution/FPS combinations and the test
     // runner imposes a timeout, we only actually start the capture and test
     // that a frame was captured for 2 frame-rates at each resolution.
     if (frame_rates_by_resolution[resolution].size() > 2)
       continue;

     capture_observer.SetExpectedCapability(capability);
     ASSERT_NO_FATAL_FAILURE(StartCapture(module.get(), capability));
     // Make sure at least one frame is captured.
     EXPECT_TRUE_WAIT(capture_observer.incoming_frames() >= 1, kTimeOut);

     EXPECT_EQ(0, module->StopCapture());
   }

 #if defined(WEBRTC_ANDROID) && WEBRTC_ANDROID
   // There's no reason for this to _necessarily_ be true, but in practice all
   // Android devices this test runs on in fact do support multiple capture
   // resolutions and multiple frame-rates per captured resolution, so we assert
   // this fact here as a regression-test against the time that we only noticed a
   // single frame-rate per resolution (bug 2974).  If this test starts being run
   // on devices for which this is untrue (e.g. Nexus4) then the following should
   // probably be wrapped in a base::android::BuildInfo::model()/device() check.
   EXPECT_GT(frame_rates_by_resolution.size(), 1U);
   for (FrameRatesByResolution::const_iterator it =
            frame_rates_by_resolution.begin();
        it != frame_rates_by_resolution.end(); ++it) {
     EXPECT_GT(it->second.size(), 1U) << it->first;
   }
 #endif  // WEBRTC_ANDROID
 }

 // NOTE: flaky, crashes sometimes.
 // http://code.google.com/p/webrtc/issues/detail?id=777
 TEST_F(VideoCaptureTest, DISABLED_TestTwoCameras) {
   if (number_of_devices_ < 2) {
     printf("There are not two cameras available. Aborting test. \n");
     return;
   }

   TestVideoCaptureCallback capture_observer1;
   rtc::scoped_refptr<VideoCaptureModule> module1(
       OpenVideoCaptureDevice(0, &capture_observer1));
   ASSERT_TRUE(module1.get() != NULL);
   VideoCaptureCapability capability1;
 #ifndef WEBRTC_MAC
   device_info_->GetCapability(module1->CurrentDeviceName(), 0, capability1);
 #else
   capability1.width = kTestWidth;
   capability1.height = kTestHeight;
   capability1.maxFPS = kTestFramerate;
   capability1.videoType = webrtc::VideoType::kUnknown;
 #endif
   capture_observer1.SetExpectedCapability(capability1);

   TestVideoCaptureCallback capture_observer2;
   rtc::scoped_refptr<VideoCaptureModule> module2(
       OpenVideoCaptureDevice(1, &capture_observer2));
   ASSERT_TRUE(module1.get() != NULL);

   VideoCaptureCapability capability2;
 #ifndef WEBRTC_MAC
   device_info_->GetCapability(module2->CurrentDeviceName(), 0, capability2);
 #else
   capability2.width = kTestWidth;
   capability2.height = kTestHeight;
   capability2.maxFPS = kTestFramerate;
   capability2.videoType = webrtc::VideoType::kUnknown;
 #endif
   capture_observer2.SetExpectedCapability(capability2);

   ASSERT_NO_FATAL_FAILURE(StartCapture(module1.get(), capability1));
   ASSERT_NO_FATAL_FAILURE(StartCapture(module2.get(), capability2));
   EXPECT_TRUE_WAIT(capture_observer1.incoming_frames() >= 5, kTimeOut);
   EXPECT_TRUE_WAIT(capture_observer2.incoming_frames() >= 5, kTimeOut);
   EXPECT_EQ(0, module2->StopCapture());
   EXPECT_EQ(0, module1->StopCapture());
 }
	/*
	* Copyright (c) 2012 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 <stdio.h>

	#include <map>
	#include <memory>
	#include <sstream>

	#include "absl/memory/memory.h"
	#include "api/scoped_refptr.h"
	#include "api/video/i420_buffer.h"
	#include "api/video/video_frame.h"
	#include "common_video/libyuv/include/webrtc_libyuv.h"
	#include "modules/utility/include/process_thread.h"
	#include "modules/video_capture/video_capture.h"
	#include "modules/video_capture/video_capture_factory.h"
	#include "rtc_base/critical_section.h"
	#include "rtc_base/time_utils.h"
	#include "system_wrappers/include/sleep.h"
	#include "test/frame_utils.h"
	#include "test/gtest.h"

	using webrtc::SleepMs;
	using webrtc::VideoCaptureCapability;
	using webrtc::VideoCaptureFactory;
	using webrtc::VideoCaptureModule;

	#define WAIT_(ex, timeout, res) \
	do { \
	res = (ex); \
	int64_t start = rtc::TimeMillis(); \
	while (!res && rtc::TimeMillis() < start + timeout) { \
	SleepMs(5); \
	res = (ex); \
	} \
	} while (0)

	#define EXPECT_TRUE_WAIT(ex, timeout) \
	do { \
	bool res; \
	WAIT_(ex, timeout, res); \
	if (!res) \
	EXPECT_TRUE(ex); \
	} while (0)

	static const int kTimeOut = 5000;
	#ifdef WEBRTC_MAC
	static const int kTestHeight = 288;
	static const int kTestWidth = 352;
	static const int kTestFramerate = 30;
	#endif

	class TestVideoCaptureCallback
	: public rtc::VideoSinkInterface<webrtc::VideoFrame> {
	public:
	TestVideoCaptureCallback()
	: last_render_time_ms_(0),
	incoming_frames_(0),
	timing_warnings_(0),
	rotate_frame_(webrtc::kVideoRotation_0) {}

	~TestVideoCaptureCallback() override {
	if (timing_warnings_ > 0)
	printf("No of timing warnings %d\n", timing_warnings_);
	}

	void OnFrame(const webrtc::VideoFrame& videoFrame) override {
	rtc::CritScope cs(&capture_cs_);
	int height = videoFrame.height();
	int width = videoFrame.width();
	#if defined(WEBRTC_ANDROID) && WEBRTC_ANDROID
	// Android camera frames may be rotated depending on test device
	// orientation.
	EXPECT_TRUE(height == capability_.height \|\| height == capability_.width);
	EXPECT_TRUE(width == capability_.width \|\| width == capability_.height);
	#else
	EXPECT_EQ(height, capability_.height);
	EXPECT_EQ(width, capability_.width);
	EXPECT_EQ(rotate_frame_, videoFrame.rotation());
	#endif
	// RenderTimstamp should be the time now.
	EXPECT_TRUE(videoFrame.render_time_ms() >= rtc::TimeMillis() - 30 &&
	videoFrame.render_time_ms() <= rtc::TimeMillis());

	if ((videoFrame.render_time_ms() >
	last_render_time_ms_ + (1000 * 1.1) / capability_.maxFPS &&
	last_render_time_ms_ > 0) \|\|
	(videoFrame.render_time_ms() <
	last_render_time_ms_ + (1000 * 0.9) / capability_.maxFPS &&
	last_render_time_ms_ > 0)) {
	timing_warnings_++;
	}

	incoming_frames_++;
	last_render_time_ms_ = videoFrame.render_time_ms();
	last_frame_ = videoFrame.video_frame_buffer();
	}

	void SetExpectedCapability(VideoCaptureCapability capability) {
	rtc::CritScope cs(&capture_cs_);
	capability_ = capability;
	incoming_frames_ = 0;
	last_render_time_ms_ = 0;
	}
	int incoming_frames() {
	rtc::CritScope cs(&capture_cs_);
	return incoming_frames_;
	}

	int timing_warnings() {
	rtc::CritScope cs(&capture_cs_);
	return timing_warnings_;
	}
	VideoCaptureCapability capability() {
	rtc::CritScope cs(&capture_cs_);
	return capability_;
	}

	bool CompareLastFrame(const webrtc::VideoFrame& frame) {
	rtc::CritScope cs(&capture_cs_);
	return webrtc::test::FrameBufsEqual(last_frame_,
	frame.video_frame_buffer());
	}

	void SetExpectedCaptureRotation(webrtc::VideoRotation rotation) {
	rtc::CritScope cs(&capture_cs_);
	rotate_frame_ = rotation;
	}

	private:
	rtc::CriticalSection capture_cs_;
	VideoCaptureCapability capability_;
	int64_t last_render_time_ms_;
	int incoming_frames_;
	int timing_warnings_;
	rtc::scoped_refptr<webrtc::VideoFrameBuffer> last_frame_;
	webrtc::VideoRotation rotate_frame_;
	};

	class VideoCaptureTest : public ::testing::Test {
	public:
	VideoCaptureTest() : number_of_devices_(0) {}

	void SetUp() override {
	device_info_.reset(VideoCaptureFactory::CreateDeviceInfo());
	assert(device_info_.get());
	number_of_devices_ = device_info_->NumberOfDevices();
	ASSERT_GT(number_of_devices_, 0u);
	}

	rtc::scoped_refptr<VideoCaptureModule> OpenVideoCaptureDevice(
	unsigned int device,
	rtc::VideoSinkInterface<webrtc::VideoFrame>* callback) {
	char device_name[256];
	char unique_name[256];

	EXPECT_EQ(0, device_info_->GetDeviceName(device, device_name, 256,
	unique_name, 256));

	rtc::scoped_refptr<VideoCaptureModule> module(
	VideoCaptureFactory::Create(unique_name));
	if (module.get() == NULL)
	return NULL;

	EXPECT_FALSE(module->CaptureStarted());

	module->RegisterCaptureDataCallback(callback);
	return module;
	}

	void StartCapture(VideoCaptureModule* capture_module,
	VideoCaptureCapability capability) {
	ASSERT_EQ(0, capture_module->StartCapture(capability));
	EXPECT_TRUE(capture_module->CaptureStarted());

	VideoCaptureCapability resulting_capability;
	EXPECT_EQ(0, capture_module->CaptureSettings(resulting_capability));
	EXPECT_EQ(capability.width, resulting_capability.width);
	EXPECT_EQ(capability.height, resulting_capability.height);
	}

	std::unique_ptr<VideoCaptureModule::DeviceInfo> device_info_;
	unsigned int number_of_devices_;
	};

	#ifdef WEBRTC_MAC
	// Currently fails on Mac 64-bit, see
	// https://bugs.chromium.org/p/webrtc/issues/detail?id=5406
	#define MAYBE_CreateDelete DISABLED_CreateDelete
	#else
	#define MAYBE_CreateDelete CreateDelete
	#endif
	TEST_F(VideoCaptureTest, MAYBE_CreateDelete) {
	for (int i = 0; i < 5; ++i) {
	int64_t start_time = rtc::TimeMillis();
	TestVideoCaptureCallback capture_observer;
	rtc::scoped_refptr<VideoCaptureModule> module(
	OpenVideoCaptureDevice(0, &capture_observer));
	ASSERT_TRUE(module.get() != NULL);

	VideoCaptureCapability capability;
	#ifndef WEBRTC_MAC
	device_info_->GetCapability(module->CurrentDeviceName(), 0, capability);
	#else
	capability.width = kTestWidth;
	capability.height = kTestHeight;
	capability.maxFPS = kTestFramerate;
	capability.videoType = webrtc::VideoType::kUnknown;
	#endif
	capture_observer.SetExpectedCapability(capability);
	ASSERT_NO_FATAL_FAILURE(StartCapture(module.get(), capability));

	// Less than 4s to start the camera.
	EXPECT_LE(rtc::TimeMillis() - start_time, 4000);

	// Make sure 5 frames are captured.
	EXPECT_TRUE_WAIT(capture_observer.incoming_frames() >= 5, kTimeOut);

	int64_t stop_time = rtc::TimeMillis();
	EXPECT_EQ(0, module->StopCapture());
	EXPECT_FALSE(module->CaptureStarted());

	// Less than 3s to stop the camera.
	EXPECT_LE(rtc::TimeMillis() - stop_time, 3000);
	}
	}

	#ifdef WEBRTC_MAC
	// Currently fails on Mac 64-bit, see
	// https://bugs.chromium.org/p/webrtc/issues/detail?id=5406
	#define MAYBE_Capabilities DISABLED_Capabilities
	#else
	#define MAYBE_Capabilities Capabilities
	#endif
	TEST_F(VideoCaptureTest, MAYBE_Capabilities) {
	#ifdef WEBRTC_MAC
	printf("Video capture capabilities are not supported on Mac.\n");
	return;
	#endif

	TestVideoCaptureCallback capture_observer;

	rtc::scoped_refptr<VideoCaptureModule> module(
	OpenVideoCaptureDevice(0, &capture_observer));
	ASSERT_TRUE(module.get() != NULL);

	int number_of_capabilities =
	device_info_->NumberOfCapabilities(module->CurrentDeviceName());
	EXPECT_GT(number_of_capabilities, 0);
	// Key is <width>x<height>, value is vector of maxFPS values at that
	// resolution.
	typedef std::map<std::string, std::vector<int> > FrameRatesByResolution;
	FrameRatesByResolution frame_rates_by_resolution;
	for (int i = 0; i < number_of_capabilities; ++i) {
	VideoCaptureCapability capability;
	EXPECT_EQ(0, device_info_->GetCapability(module->CurrentDeviceName(), i,
	capability));
	std::ostringstream resolutionStream;
	resolutionStream << capability.width << "x" << capability.height;
	resolutionStream.flush();
	std::string resolution = resolutionStream.str();
	frame_rates_by_resolution[resolution].push_back(capability.maxFPS);

	// Since Android presents so many resolution/FPS combinations and the test
	// runner imposes a timeout, we only actually start the capture and test
	// that a frame was captured for 2 frame-rates at each resolution.
	if (frame_rates_by_resolution[resolution].size() > 2)
	continue;

	capture_observer.SetExpectedCapability(capability);
	ASSERT_NO_FATAL_FAILURE(StartCapture(module.get(), capability));
	// Make sure at least one frame is captured.
	EXPECT_TRUE_WAIT(capture_observer.incoming_frames() >= 1, kTimeOut);

	EXPECT_EQ(0, module->StopCapture());
	}

	#if defined(WEBRTC_ANDROID) && WEBRTC_ANDROID
	// There's no reason for this to _necessarily_ be true, but in practice all
	// Android devices this test runs on in fact do support multiple capture
	// resolutions and multiple frame-rates per captured resolution, so we assert
	// this fact here as a regression-test against the time that we only noticed a
	// single frame-rate per resolution (bug 2974). If this test starts being run
	// on devices for which this is untrue (e.g. Nexus4) then the following should
	// probably be wrapped in a base::android::BuildInfo::model()/device() check.
	EXPECT_GT(frame_rates_by_resolution.size(), 1U);
	for (FrameRatesByResolution::const_iterator it =
	frame_rates_by_resolution.begin();
	it != frame_rates_by_resolution.end(); ++it) {
	EXPECT_GT(it->second.size(), 1U) << it->first;
	}
	#endif // WEBRTC_ANDROID
	}

	// NOTE: flaky, crashes sometimes.
	// http://code.google.com/p/webrtc/issues/detail?id=777
	TEST_F(VideoCaptureTest, DISABLED_TestTwoCameras) {
	if (number_of_devices_ < 2) {
	printf("There are not two cameras available. Aborting test. \n");
	return;
	}

	TestVideoCaptureCallback capture_observer1;
	rtc::scoped_refptr<VideoCaptureModule> module1(
	OpenVideoCaptureDevice(0, &capture_observer1));
	ASSERT_TRUE(module1.get() != NULL);
	VideoCaptureCapability capability1;
	#ifndef WEBRTC_MAC
	device_info_->GetCapability(module1->CurrentDeviceName(), 0, capability1);
	#else
	capability1.width = kTestWidth;
	capability1.height = kTestHeight;
	capability1.maxFPS = kTestFramerate;
	capability1.videoType = webrtc::VideoType::kUnknown;
	#endif
	capture_observer1.SetExpectedCapability(capability1);

	TestVideoCaptureCallback capture_observer2;
	rtc::scoped_refptr<VideoCaptureModule> module2(
	OpenVideoCaptureDevice(1, &capture_observer2));
	ASSERT_TRUE(module1.get() != NULL);

	VideoCaptureCapability capability2;
	#ifndef WEBRTC_MAC
	device_info_->GetCapability(module2->CurrentDeviceName(), 0, capability2);
	#else
	capability2.width = kTestWidth;
	capability2.height = kTestHeight;
	capability2.maxFPS = kTestFramerate;
	capability2.videoType = webrtc::VideoType::kUnknown;
	#endif
	capture_observer2.SetExpectedCapability(capability2);

	ASSERT_NO_FATAL_FAILURE(StartCapture(module1.get(), capability1));
	ASSERT_NO_FATAL_FAILURE(StartCapture(module2.get(), capability2));
	EXPECT_TRUE_WAIT(capture_observer1.incoming_frames() >= 5, kTimeOut);
	EXPECT_TRUE_WAIT(capture_observer2.incoming_frames() >= 5, kTimeOut);
	EXPECT_EQ(0, module2->StopCapture());
	EXPECT_EQ(0, module1->StopCapture());
	}