Implemented Multiple video track recoding.

media/capture/webm_muxer_unittest.cc

Index: media/capture/webm_muxer_unittest.cc
diff --git a/media/capture/webm_muxer_unittest.cc b/media/capture/webm_muxer_unittest.cc
index 7e162fa0a676b0422cb17b88956486dd6de22e7c..95adf997ee82b0cf91e27d9712e9f0e49cb67f53 100644
--- a/media/capture/webm_muxer_unittest.cc
+++ b/media/capture/webm_muxer_unittest.cc
@@ -47,6 +47,11 @@ class WebmMuxerTest : public testing::Test {
     return webm_muxer_.segment_.mode();
   }
 
+  bool HasTrack(int track_index) const {
+    return webm_muxer_.segment_.GetTrackByNumber(
+        webm_muxer_.video_muxer_args_[track_index].track_number) != NULL;
+  }
+
   mkvmuxer::int32 WebmMuxerWrite(const void* buf, mkvmuxer::uint32 len) {
     return webm_muxer_.Write(buf, len);
   }
@@ -78,12 +83,14 @@ TEST_F(WebmMuxerTest, OnEncodedVideoTwoFrames) {
   const scoped_refptr<VideoFrame> video_frame =
       VideoFrame::CreateBlackFrame(frame_size);
   const std::string encoded_data("abcdefghijklmnopqrstuvwxyz");
+  int track_index = webm_muxer_.GetNextVideoTrackIndex();
 
   EXPECT_CALL(*this, WriteCallback(_))
       .Times(AtLeast(1))
       .WillRepeatedly(WithArgs<0>(
           Invoke(this, &WebmMuxerTest::SaveEncodedDataLen)));
-  webm_muxer_.OnEncodedVideo(video_frame,
+  webm_muxer_.OnEncodedVideo(track_index,
+                             video_frame,
                              make_scoped_ptr(new std::string(encoded_data)),
                              base::TimeTicks::Now(),
                              false  /* keyframe */);
@@ -100,7 +107,54 @@ TEST_F(WebmMuxerTest, OnEncodedVideoTwoFrames) {
       .Times(AtLeast(1))
       .WillRepeatedly(WithArgs<0>(
           Invoke(this, &WebmMuxerTest::SaveEncodedDataLen)));
-  webm_muxer_.OnEncodedVideo(video_frame,
+  webm_muxer_.OnEncodedVideo(track_index,
+                             video_frame,
+                             make_scoped_ptr(new std::string(encoded_data)),
+                             base::TimeTicks::Now(),
+                             false  /* keyframe */);
+
+  // The second time around the callbacks should include a SimpleBlock header,
+  // namely the track index, a timestamp and a flags byte, for a total of 6B.
+  EXPECT_EQ(last_encoded_length_, encoded_data.size());
+  EXPECT_EQ(GetWebmMuxerPosition(), accumulated_position_);
+  const uint32_t kSimpleBlockSize = 6u;
+  EXPECT_EQ(static_cast<int64_t>(begin_of_second_block + kSimpleBlockSize +
+                                 encoded_data.size()),
+            accumulated_position_);
+}
+
+TEST_F(WebmMuxerTest, OnEncodedVideoTwoTracks) {
+  const gfx::Size frame_size(160, 80);
+  const scoped_refptr<VideoFrame> video_frame =
+      VideoFrame::CreateBlackFrame(frame_size);
+  const std::string encoded_data("abcdefghijklmnopqrstuvwxyz");
+  int track_index_1 = webm_muxer_.GetNextVideoTrackIndex();
+  EXPECT_CALL(*this, WriteCallback(_))
+      .Times(AtLeast(1))
+      .WillRepeatedly(WithArgs<0>(
+          Invoke(this, &WebmMuxerTest::SaveEncodedDataLen)));
+  webm_muxer_.OnEncodedVideo(track_index_1,
+                             video_frame,
+                             make_scoped_ptr(new std::string(encoded_data)),
+                             base::TimeTicks::Now(),
+                             false  /* keyframe */);
+
+  // First time around WriteCallback() is pinged a number of times to write the
+  // Matroska header, but at the end it dumps |encoded_data|.
+  EXPECT_EQ(last_encoded_length_, encoded_data.size());
+  EXPECT_EQ(GetWebmMuxerPosition(), accumulated_position_);
+  EXPECT_GE(GetWebmMuxerPosition(), static_cast<int64_t>(last_encoded_length_));
+  EXPECT_EQ(GetWebmSegmentMode(), mkvmuxer::Segment::kLive);
+
+  int track_index_2 = webm_muxer_.GetNextVideoTrackIndex();
+
+  const int64_t begin_of_second_block = accumulated_position_;
+  EXPECT_CALL(*this, WriteCallback(_))
+      .Times(AtLeast(1))
+      .WillRepeatedly(WithArgs<0>(
+          Invoke(this, &WebmMuxerTest::SaveEncodedDataLen)));
+  webm_muxer_.OnEncodedVideo(track_index_2,
+                             video_frame,
                              make_scoped_ptr(new std::string(encoded_data)),
                              base::TimeTicks::Now(),
                              false  /* keyframe */);
@@ -113,6 +167,8 @@ TEST_F(WebmMuxerTest, OnEncodedVideoTwoFrames) {
   EXPECT_EQ(static_cast<int64_t>(begin_of_second_block + kSimpleBlockSize +
                                  encoded_data.size()),
             accumulated_position_);
+  EXPECT_TRUE(HasTrack(track_index_1));
+  EXPECT_TRUE(HasTrack(track_index_2));
 }
 
 }  // namespace media