Support (E)AC3 passthrough

content/browser/renderer_host/media/audio_sync_reader.cc

Index: content/browser/renderer_host/media/audio_sync_reader.cc
diff --git a/content/browser/renderer_host/media/audio_sync_reader.cc b/content/browser/renderer_host/media/audio_sync_reader.cc
index 18ac79d070666078c6e7d97280c1a5650d848e84..a699cb946e8994395ee76c4148690016dd6641ca 100644
--- a/content/browser/renderer_host/media/audio_sync_reader.cc
+++ b/content/browser/renderer_host/media/audio_sync_reader.cc
@@ -74,6 +74,7 @@ AudioSyncReader::AudioSyncReader(
       reinterpret_cast<AudioOutputBuffer*>(shared_memory_->memory());
   output_bus_ = AudioBus::WrapMemory(params, buffer->audio);
   output_bus_->Zero();
+  output_bus_->set_is_bitstream_format(params.IsBitstreamFormat());
 }
 
 AudioSyncReader::~AudioSyncReader() {
@@ -212,8 +213,15 @@ void AudioSyncReader::Read(AudioBus* dest) {
 
   if (mute_audio_)

[DaleCurtis, 2017/06/15 21:46:31]

Just return instead of having else block.

[AndyWu, 2017/08/02 01:43:38]

Done.

     dest->Zero();
-  else
+  else {
+    if (output_bus_->is_bitstream_format()) {
+      AudioOutputBuffer* buffer =
+          reinterpret_cast<AudioOutputBuffer*>(shared_memory_->memory());
+      output_bus_->set_frames(buffer->params.frames);
+      output_bus_->set_data_size(buffer->params.data_size);
+    }
     output_bus_->CopyTo(dest);
+  }
 }
 
 void AudioSyncReader::Close() {