Enable capturing from camera in PC framework

Bug: webrtc:10138
Change-Id: I6b2eaddf4975ddc7237932511de06744ef962489
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/154357
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29318}
diff --git a/api/test/peerconnection_quality_test_fixture.h b/api/test/peerconnection_quality_test_fixture.h
index c755872..5ebe5d07 100644
--- a/api/test/peerconnection_quality_test_fixture.h
+++ b/api/test/peerconnection_quality_test_fixture.h
@@ -167,16 +167,18 @@
     // Have to be unique among all specified configs for all peers in the call.
     // Will be auto generated if omitted.
     absl::optional<std::string> stream_label;
-    // Only 1 from |generator|, |input_file_name| and |screen_share_config| can
-    // be specified. If none of them are specified, then |generator| will be set
-    // to VideoGeneratorType::kDefault.
-    // If specified generator of this type will be used to produce input video.
+    // Only 1 from |generator|, |input_file_name|, |screen_share_config| and
+    // |capturing_device_index| can be specified. If none of them are specified,
+    // then |generator| will be set to VideoGeneratorType::kDefault. If
+    // specified generator of this type will be used to produce input video.
     absl::optional<VideoGeneratorType> generator;
     // If specified this file will be used as input. Input video will be played
     // in a circle.
     absl::optional<std::string> input_file_name;
     // If specified screen share video stream will be created as input.
     absl::optional<ScreenShareConfig> screen_share_config;
+    // If specified this capturing device will be used to get input video.
+    absl::optional<size_t> capturing_device_index;
     // If presented video will be transfered in simulcast/SVC mode depending on
     // which encoder is used.
     //
diff --git a/test/DEPS b/test/DEPS
index 0f4fd2f..a5f4aae 100644
--- a/test/DEPS
+++ b/test/DEPS
@@ -65,5 +65,8 @@
   ".*sdp_changer\.(h|cc)": [
     "+pc",
     "+p2p",
+  ],
+  ".*video_quality_analyzer_injection_helper\.(h|cc)": [
+    "+pc",
   ]
 }
diff --git a/test/pc/e2e/BUILD.gn b/test/pc/e2e/BUILD.gn
index 3d34e7b..fb3747c 100644
--- a/test/pc/e2e/BUILD.gn
+++ b/test/pc/e2e/BUILD.gn
@@ -198,6 +198,7 @@
       "../../../api/video:video_frame",
       "../../../api/video:video_rtp_headers",
       "../../../api/video_codecs:video_codecs_api",
+      "../../../pc:peerconnection",
       "../../../test:video_test_common",
       "../../../test:video_test_support",
       "//third_party/abseil-cpp/absl/memory",
@@ -275,6 +276,8 @@
       ":test_peer",
       ":video_quality_analyzer_injection_helper",
       "../..:field_trial",
+      "../..:platform_video_capturer",
+      "../..:video_test_common",
       "../../../api:audio_quality_analyzer_api",
       "../../../api:libjingle_peerconnection_api",
       "../../../api:media_stream_interface",
diff --git a/test/pc/e2e/analyzer/video/default_video_quality_analyzer.cc b/test/pc/e2e/analyzer/video/default_video_quality_analyzer.cc
index 2605461..fcef1fe 100644
--- a/test/pc/e2e/analyzer/video/default_video_quality_analyzer.cc
+++ b/test/pc/e2e/analyzer/video/default_video_quality_analyzer.cc
@@ -159,7 +159,8 @@
     const webrtc::VideoFrame& frame) {
   rtc::CritScope crit(&lock_);
   auto it = frame_stats_.find(frame.id());
-  RTC_DCHECK(it != frame_stats_.end());
+  RTC_DCHECK(it != frame_stats_.end())
+      << "Frame id=" << frame.id() << " not found";
   frame_counters_.pre_encoded++;
   stream_frame_counters_[it->second.stream_label].pre_encoded++;
   it->second.pre_encode_time = Now();
diff --git a/test/pc/e2e/analyzer/video/video_quality_analyzer_injection_helper.cc b/test/pc/e2e/analyzer/video/video_quality_analyzer_injection_helper.cc
index b7d87b8..057e5b8 100644
--- a/test/pc/e2e/analyzer/video/video_quality_analyzer_injection_helper.cc
+++ b/test/pc/e2e/analyzer/video/video_quality_analyzer_injection_helper.cc
@@ -11,6 +11,7 @@
 #include "test/pc/e2e/analyzer/video/video_quality_analyzer_injection_helper.h"
 
 #include <utility>
+#include <vector>
 
 #include "absl/memory/memory.h"
 #include "test/pc/e2e/analyzer/video/quality_analyzing_video_decoder.h"
@@ -38,6 +39,65 @@
   test::VideoFrameWriter* video_writer_;
 };
 
+class AnalyzingVideoSource : public rtc::VideoSourceInterface<VideoFrame> {
+ public:
+  AnalyzingVideoSource(
+      std::string stream_label,
+      VideoQualityAnalyzerInterface* analyzer,
+      std::unique_ptr<test::TestVideoCapturer> test_capturer,
+      std::vector<std::unique_ptr<rtc::VideoSinkInterface<VideoFrame>>> sinks)
+      : test_capturer_(std::move(test_capturer)),
+        analyzing_sink_(stream_label, analyzer, &broadcaster_),
+        sinks_(std::move(sinks)) {
+    for (auto& sink : sinks_) {
+      broadcaster_.AddOrUpdateSink(sink.get(), rtc::VideoSinkWants());
+    }
+  }
+
+  void AddOrUpdateSink(rtc::VideoSinkInterface<VideoFrame>* sink,
+                       const rtc::VideoSinkWants& wants) override {
+    broadcaster_.AddOrUpdateSink(sink, wants);
+    test_capturer_->AddOrUpdateSink(&analyzing_sink_, broadcaster_.wants());
+  }
+
+  void RemoveSink(rtc::VideoSinkInterface<VideoFrame>* sink) override {
+    broadcaster_.RemoveSink(sink);
+    test_capturer_->AddOrUpdateSink(&analyzing_sink_, broadcaster_.wants());
+  }
+
+ private:
+  class AnalyzerCapturingVideoSink
+      : public rtc::VideoSinkInterface<VideoFrame> {
+   public:
+    AnalyzerCapturingVideoSink(std::string stream_label,
+                               VideoQualityAnalyzerInterface* analyzer,
+                               rtc::VideoBroadcaster* broadcaster)
+        : stream_label_(std::move(stream_label)),
+          analyzer_(analyzer),
+          broadcaster_(broadcaster) {}
+    ~AnalyzerCapturingVideoSink() override = default;
+
+    void OnFrame(const VideoFrame& source_frame) override {
+      // Copy VideoFrame to be able to set id on it.
+      VideoFrame frame = source_frame;
+      uint16_t frame_id = analyzer_->OnFrameCaptured(stream_label_, frame);
+      frame.set_id(frame_id);
+      broadcaster_->OnFrame(frame);
+    }
+
+   private:
+    const std::string stream_label_;
+    VideoQualityAnalyzerInterface* const analyzer_;
+    rtc::VideoBroadcaster* const broadcaster_;
+  };
+
+  rtc::VideoBroadcaster broadcaster_;
+  std::unique_ptr<test::TestVideoCapturer> test_capturer_;
+  AnalyzerCapturingVideoSink analyzing_sink_;
+  const std::vector<std::unique_ptr<rtc::VideoSinkInterface<VideoFrame>>>
+      sinks_;
+};
+
 // Intercepts generated frames and passes them also to video quality analyzer
 // and to provided sinks.
 class AnalyzingFrameGenerator final : public test::FrameGenerator {
@@ -142,11 +202,12 @@
       analyzer_.get());
 }
 
-std::unique_ptr<test::FrameGenerator>
-VideoQualityAnalyzerInjectionHelper::WrapFrameGenerator(
+rtc::scoped_refptr<TestVideoCapturerVideoTrackSource>
+VideoQualityAnalyzerInjectionHelper::CreateVideoTrackSource(
     const VideoConfig& config,
-    std::unique_ptr<test::FrameGenerator> delegate,
-    test::VideoFrameWriter* writer) const {
+    std::unique_ptr<test::TestVideoCapturer> capturer,
+    test::VideoFrameWriter* writer,
+    bool is_screencast) const {
   std::vector<std::unique_ptr<rtc::VideoSinkInterface<VideoFrame>>> sinks;
   if (writer) {
     sinks.push_back(std::make_unique<VideoWriter>(writer));
@@ -156,9 +217,11 @@
         test::VideoRenderer::Create((*config.stream_label + "-capture").c_str(),
                                     config.width, config.height)));
   }
-  return std::make_unique<AnalyzingFrameGenerator>(
-      std::move(*config.stream_label), std::move(delegate), analyzer_.get(),
-      std::move(sinks));
+  return new rtc::RefCountedObject<TestVideoCapturerVideoTrackSource>(
+      std::make_unique<AnalyzingVideoSource>(
+          std::move(*config.stream_label), analyzer_.get(), std::move(capturer),
+          std::move(sinks)),
+      is_screencast);
 }
 
 std::unique_ptr<rtc::VideoSinkInterface<VideoFrame>>
diff --git a/test/pc/e2e/analyzer/video/video_quality_analyzer_injection_helper.h b/test/pc/e2e/analyzer/video/video_quality_analyzer_injection_helper.h
index eb07a5d..b106a3c 100644
--- a/test/pc/e2e/analyzer/video/video_quality_analyzer_injection_helper.h
+++ b/test/pc/e2e/analyzer/video/video_quality_analyzer_injection_helper.h
@@ -22,14 +22,43 @@
 #include "api/video/video_sink_interface.h"
 #include "api/video_codecs/video_decoder_factory.h"
 #include "api/video_codecs/video_encoder_factory.h"
+#include "pc/video_track_source.h"
 #include "test/frame_generator.h"
 #include "test/pc/e2e/analyzer/video/encoded_image_data_injector.h"
 #include "test/pc/e2e/analyzer/video/id_generator.h"
+#include "test/test_video_capturer.h"
 #include "test/testsupport/video_frame_writer.h"
 
 namespace webrtc {
 namespace webrtc_pc_e2e {
 
+class TestVideoCapturerVideoTrackSource : public VideoTrackSource {
+ public:
+  TestVideoCapturerVideoTrackSource(
+      std::unique_ptr<rtc::VideoSourceInterface<VideoFrame>> source,
+      bool is_screencast)
+      : VideoTrackSource(false /* remote */),
+        source_(std::move(source)),
+        is_screencast_(is_screencast) {}
+
+  ~TestVideoCapturerVideoTrackSource() = default;
+
+  void Start() { SetState(kLive); }
+
+  void Stop() { SetState(kMuted); }
+
+  bool is_screencast() const override { return is_screencast_; }
+
+ protected:
+  rtc::VideoSourceInterface<VideoFrame>* source() override {
+    return source_.get();
+  }
+
+ private:
+  std::unique_ptr<rtc::VideoSourceInterface<VideoFrame>> source_;
+  const bool is_screencast_;
+};
+
 // Provides factory methods for components, that will be used to inject
 // VideoQualityAnalyzerInterface into PeerConnection pipeline.
 class VideoQualityAnalyzerInjectionHelper : public StatsObserverInterface {
@@ -54,16 +83,18 @@
   std::unique_ptr<VideoDecoderFactory> WrapVideoDecoderFactory(
       std::unique_ptr<VideoDecoderFactory> delegate) const;
 
-  // Wraps frame generator, so video quality analyzer will gain access to the
-  // captured frames. If |writer| in not nullptr, will dump captured frames
-  // with provided writer.
-  std::unique_ptr<test::FrameGenerator> WrapFrameGenerator(
+  // Creates video track source, that will allow video quality analyzer to get
+  // access to captured frames. If |writer| in not nullptr, will dump rendered
+  // frames with provided writer.
+  rtc::scoped_refptr<TestVideoCapturerVideoTrackSource> CreateVideoTrackSource(
       const VideoConfig& config,
-      std::unique_ptr<test::FrameGenerator> delegate,
-      test::VideoFrameWriter* writer) const;
-  // Creates sink, that will allow video quality analyzer to get access to the
-  // rendered frames. If |writer| in not nullptr, will dump rendered frames
-  // with provided writer.
+      std::unique_ptr<test::TestVideoCapturer> capturer,
+      test::VideoFrameWriter* writer,
+      bool is_screencast) const;
+
+  // Creates sink, that will allow video quality analyzer to get access to
+  // the rendered frames. If |writer| in not nullptr, will dump rendered
+  // frames with provided writer.
   std::unique_ptr<rtc::VideoSinkInterface<VideoFrame>> CreateVideoSink(
       const VideoConfig& config,
       test::VideoFrameWriter* writer) const;
diff --git a/test/pc/e2e/peer_connection_quality_test.cc b/test/pc/e2e/peer_connection_quality_test.cc
index 70bfec9..7913709 100644
--- a/test/pc/e2e/peer_connection_quality_test.cc
+++ b/test/pc/e2e/peer_connection_quality_test.cc
@@ -30,9 +30,11 @@
 #include "rtc_base/numerics/safe_conversions.h"
 #include "system_wrappers/include/cpu_info.h"
 #include "system_wrappers/include/field_trial.h"
+#include "test/frame_generator_capturer.h"
 #include "test/pc/e2e/analyzer/audio/default_audio_quality_analyzer.h"
 #include "test/pc/e2e/analyzer/video/default_video_quality_analyzer.h"
 #include "test/pc/e2e/stats_poller.h"
+#include "test/platform_video_capturer.h"
 #include "test/testsupport/file_utils.h"
 
 namespace webrtc {
@@ -67,7 +69,9 @@
           << "; video_config.input_file_name="
           << video_config.input_file_name.has_value()
           << "; video_config.screen_share_config="
-          << video_config.screen_share_config.has_value() << ";";
+          << video_config.screen_share_config.has_value()
+          << "; video_config.capturing_device_index="
+          << video_config.capturing_device_index.has_value() << ";";
   return builder.str();
 }
 
@@ -418,7 +422,7 @@
   // Audio dumps.
   RTC_CHECK(!alice_);
   RTC_CHECK(!bob_);
-  // Ensuring that FrameGeneratorCapturerVideoTrackSource and VideoFrameWriter
+  // Ensuring that TestVideoCapturerVideoTrackSource and VideoFrameWriter
   // are destroyed on the right thread.
   RTC_CHECK(alice_video_sources_.empty());
   RTC_CHECK(bob_video_sources_.empty());
@@ -434,7 +438,8 @@
   for (auto* p : params) {
     for (auto& video_config : p->video_configs) {
       if (!video_config.generator && !video_config.input_file_name &&
-          !video_config.screen_share_config) {
+          !video_config.screen_share_config &&
+          !video_config.capturing_device_index) {
         video_config.generator = VideoGeneratorType::kDefault;
       }
       if (!video_config.stream_label) {
@@ -483,15 +488,16 @@
           video_labels.insert(video_config.stream_label.value()).second;
       RTC_CHECK(inserted) << "Duplicate video_config.stream_label="
                           << video_config.stream_label.value();
-      RTC_CHECK(video_config.generator || video_config.input_file_name ||
-                video_config.screen_share_config)
-          << VideoConfigSourcePresenceToString(video_config);
-      RTC_CHECK(!(video_config.input_file_name && video_config.generator))
-          << VideoConfigSourcePresenceToString(video_config);
-      RTC_CHECK(
-          !(video_config.input_file_name && video_config.screen_share_config))
-          << VideoConfigSourcePresenceToString(video_config);
-      RTC_CHECK(!(video_config.screen_share_config && video_config.generator))
+      int input_sources_count = 0;
+      if (video_config.generator)
+        ++input_sources_count;
+      if (video_config.input_file_name)
+        ++input_sources_count;
+      if (video_config.screen_share_config)
+        ++input_sources_count;
+      if (video_config.capturing_device_index)
+        ++input_sources_count;
+      RTC_CHECK_EQ(input_sources_count, 1)
           << VideoConfigSourcePresenceToString(video_config);
 
       if (video_config.screen_share_config) {
@@ -678,38 +684,26 @@
   TearDownCall();
 }
 
-std::vector<rtc::scoped_refptr<FrameGeneratorCapturerVideoTrackSource>>
+std::vector<rtc::scoped_refptr<TestVideoCapturerVideoTrackSource>>
 PeerConnectionE2EQualityTest::MaybeAddMedia(TestPeer* peer) {
   MaybeAddAudio(peer);
   return MaybeAddVideo(peer);
 }
 
-std::vector<rtc::scoped_refptr<FrameGeneratorCapturerVideoTrackSource>>
+std::vector<rtc::scoped_refptr<TestVideoCapturerVideoTrackSource>>
 PeerConnectionE2EQualityTest::MaybeAddVideo(TestPeer* peer) {
   // Params here valid because of pre-run validation.
   Params* params = peer->params();
-  std::vector<rtc::scoped_refptr<FrameGeneratorCapturerVideoTrackSource>> out;
+  std::vector<rtc::scoped_refptr<TestVideoCapturerVideoTrackSource>> out;
   for (auto video_config : params->video_configs) {
-    // Create video generator.
-    std::unique_ptr<test::FrameGenerator> frame_generator =
-        CreateFrameGenerator(video_config);
-
-    // Wrap it to inject video quality analyzer and enable dump of input video
-    // if required.
+    // Setup input video source into peer connection.
+    std::unique_ptr<test::TestVideoCapturer> capturer =
+        CreateVideoCapturer(video_config);
     test::VideoFrameWriter* writer =
         MaybeCreateVideoWriter(video_config.input_dump_file_name, video_config);
-    frame_generator =
-        video_quality_analyzer_injection_helper_->WrapFrameGenerator(
-            video_config, std::move(frame_generator), writer);
-
-    // Setup FrameGenerator into peer connection.
-    auto capturer = std::make_unique<test::FrameGeneratorCapturer>(
-        clock_, std::move(frame_generator), video_config.fps,
-        *task_queue_factory_);
-    capturer->Init();
-    rtc::scoped_refptr<FrameGeneratorCapturerVideoTrackSource> source =
-        new rtc::RefCountedObject<FrameGeneratorCapturerVideoTrackSource>(
-            std::move(capturer),
+    rtc::scoped_refptr<TestVideoCapturerVideoTrackSource> source =
+        video_quality_analyzer_injection_helper_->CreateVideoTrackSource(
+            video_config, std::move(capturer), writer,
             /*is_screencast=*/video_config.screen_share_config &&
                 video_config.screen_share_config->use_text_content_hint);
     out.push_back(source);
@@ -738,9 +732,21 @@
   return out;
 }
 
-std::unique_ptr<test::FrameGenerator>
-PeerConnectionE2EQualityTest::CreateFrameGenerator(
+std::unique_ptr<test::TestVideoCapturer>
+PeerConnectionE2EQualityTest::CreateVideoCapturer(
     const VideoConfig& video_config) {
+  if (video_config.capturing_device_index) {
+    std::unique_ptr<test::TestVideoCapturer> capturer =
+        test::CreateVideoCapturer(video_config.width, video_config.height,
+                                  video_config.fps,
+                                  *video_config.capturing_device_index);
+    RTC_CHECK(capturer)
+        << "Failed to obtain input stream from capturing device #"
+        << *video_config.capturing_device_index;
+    return capturer;
+  }
+
+  std::unique_ptr<test::FrameGenerator> frame_generator = nullptr;
   if (video_config.generator) {
     absl::optional<test::FrameGenerator::OutputType> frame_generator_type =
         absl::nullopt;
@@ -751,22 +757,27 @@
     } else if (video_config.generator == VideoGeneratorType::kI010) {
       frame_generator_type = test::FrameGenerator::OutputType::kI010;
     }
-    return test::FrameGenerator::CreateSquareGenerator(
+    frame_generator = test::FrameGenerator::CreateSquareGenerator(
         static_cast<int>(video_config.width),
         static_cast<int>(video_config.height), frame_generator_type,
         absl::nullopt);
   }
   if (video_config.input_file_name) {
-    return test::FrameGenerator::CreateFromYuvFile(
+    frame_generator = test::FrameGenerator::CreateFromYuvFile(
         std::vector<std::string>(/*count=*/1,
                                  video_config.input_file_name.value()),
         video_config.width, video_config.height, /*frame_repeat_count=*/1);
   }
   if (video_config.screen_share_config) {
-    return CreateScreenShareFrameGenerator(video_config);
+    frame_generator = CreateScreenShareFrameGenerator(video_config);
   }
-  RTC_NOTREACHED() << "Unsupported video_config input source";
-  return nullptr;
+  RTC_CHECK(frame_generator) << "Unsupported video_config input source";
+
+  auto capturer = std::make_unique<test::FrameGeneratorCapturer>(
+      clock_, std::move(frame_generator), video_config.fps,
+      *task_queue_factory_);
+  capturer->Init();
+  return capturer;
 }
 
 std::unique_ptr<test::FrameGenerator>
@@ -955,8 +966,8 @@
 }
 
 void PeerConnectionE2EQualityTest::StartVideo(
-    const std::vector<
-        rtc::scoped_refptr<FrameGeneratorCapturerVideoTrackSource>>& sources) {
+    const std::vector<rtc::scoped_refptr<TestVideoCapturerVideoTrackSource>>&
+        sources) {
   for (auto& source : sources) {
     if (source->state() != MediaSourceInterface::SourceState::kLive) {
       source->Start();
diff --git a/test/pc/e2e/peer_connection_quality_test.h b/test/pc/e2e/peer_connection_quality_test.h
index 43a2f94..f562838 100644
--- a/test/pc/e2e/peer_connection_quality_test.h
+++ b/test/pc/e2e/peer_connection_quality_test.h
@@ -20,7 +20,6 @@
 #include "api/test/peerconnection_quality_test_fixture.h"
 #include "api/units/time_delta.h"
 #include "api/units/timestamp.h"
-#include "pc/test/frame_generator_capturer_video_track_source.h"
 #include "rtc_base/task_queue_for_test.h"
 #include "rtc_base/task_utils/repeating_task.h"
 #include "rtc_base/thread.h"
@@ -230,11 +229,11 @@
   // Have to be run on the signaling thread.
   void SetupCallOnSignalingThread(const RunParams& run_params);
   void TearDownCallOnSignalingThread();
-  std::vector<rtc::scoped_refptr<FrameGeneratorCapturerVideoTrackSource>>
+  std::vector<rtc::scoped_refptr<TestVideoCapturerVideoTrackSource>>
   MaybeAddMedia(TestPeer* peer);
-  std::vector<rtc::scoped_refptr<FrameGeneratorCapturerVideoTrackSource>>
+  std::vector<rtc::scoped_refptr<TestVideoCapturerVideoTrackSource>>
   MaybeAddVideo(TestPeer* peer);
-  std::unique_ptr<test::FrameGenerator> CreateFrameGenerator(
+  std::unique_ptr<test::TestVideoCapturer> CreateVideoCapturer(
       const VideoConfig& video_config);
   std::unique_ptr<test::FrameGenerator> CreateScreenShareFrameGenerator(
       const VideoConfig& video_config);
@@ -244,8 +243,8 @@
   void ExchangeOfferAnswer(SignalingInterceptor* signaling_interceptor);
   void ExchangeIceCandidates(SignalingInterceptor* signaling_interceptor);
   void StartVideo(
-      const std::vector<
-          rtc::scoped_refptr<FrameGeneratorCapturerVideoTrackSource>>& sources);
+      const std::vector<rtc::scoped_refptr<TestVideoCapturerVideoTrackSource>>&
+          sources);
   void TearDownCall();
   test::VideoFrameWriter* MaybeCreateVideoWriter(
       absl::optional<std::string> file_name,
@@ -270,9 +269,9 @@
   std::vector<std::unique_ptr<QualityMetricsReporter>>
       quality_metrics_reporters_;
 
-  std::vector<rtc::scoped_refptr<FrameGeneratorCapturerVideoTrackSource>>
+  std::vector<rtc::scoped_refptr<TestVideoCapturerVideoTrackSource>>
       alice_video_sources_;
-  std::vector<rtc::scoped_refptr<FrameGeneratorCapturerVideoTrackSource>>
+  std::vector<rtc::scoped_refptr<TestVideoCapturerVideoTrackSource>>
       bob_video_sources_;
   std::vector<std::unique_ptr<test::VideoFrameWriter>> video_writers_;
   std::vector<std::unique_ptr<rtc::VideoSinkInterface<VideoFrame>>>