Re-add AC3/EAC3 audio demuxing support

media/filters/ffmpeg_demuxer_unittest.cc

Index: media/filters/ffmpeg_demuxer_unittest.cc
diff --git a/media/filters/ffmpeg_demuxer_unittest.cc b/media/filters/ffmpeg_demuxer_unittest.cc
index 1e915b943d4f06d5ebeb156d7947c570c5afa9dc..ed76e50b4fd2950707abea25597607debd41083c 100644
--- a/media/filters/ffmpeg_demuxer_unittest.cc
+++ b/media/filters/ffmpeg_demuxer_unittest.cc
@@ -1128,4 +1128,36 @@ TEST_F(FFmpegDemuxerTest, HEVC_in_MP4_container) {
 }
 #endif
 
+#if defined(ENABLE_AC3_EAC3_AUDIO_DEMUXING)
+TEST_F(FFmpegDemuxerTest, Read_AC3_Audio) {
+  CreateDemuxer("bear-ac3-frag.mp4");
+  InitializeDemuxer();
+
+  // Attempt a read from the audio stream and run the message loop until done.
+  DemuxerStream* audio = demuxer_->GetStream(DemuxerStream::AUDIO);
+
+  // Read the first two frames and check that we are getting expected data
+  audio->Read(NewReadCB(FROM_HERE, 834, 0, true));
+  message_loop_.Run();
+
+  audio->Read(NewReadCB(FROM_HERE, 836, 34830, true));
+  message_loop_.Run();
+}
+
+TEST_F(FFmpegDemuxerTest, Read_EAC3_Audio) {
+  CreateDemuxer("bear-eac3-frag.mp4");
+  InitializeDemuxer();
+
+  // Attempt a read from the audio stream and run the message loop until done.
+  DemuxerStream* audio = demuxer_->GetStream(DemuxerStream::AUDIO);
+
+  // Read the first two frames and check that we are getting expected data
+  audio->Read(NewReadCB(FROM_HERE, 870, 0, true));
+  message_loop_.Run();
+
+  audio->Read(NewReadCB(FROM_HERE, 872, 34830, true));
+  message_loop_.Run();
+}
+#endif  // ENABLE_AC3_EAC3_AUDIO_DEMUXING
+
 }  // namespace media