Chromecast: Add stream id interface in DecoderBufferBase class

chromecast/media/cma/ipc_streamer/decoder_buffer_base_marshaller.cc

Index: chromecast/media/cma/ipc_streamer/decoder_buffer_base_marshaller.cc
diff --git a/chromecast/media/cma/ipc_streamer/decoder_buffer_base_marshaller.cc b/chromecast/media/cma/ipc_streamer/decoder_buffer_base_marshaller.cc
index a377ae66337e5ab9014c7675f3a6e6e6c35d825e..dd42d35766ea0180beb98b97930e6a477fc7bd3a 100644
--- a/chromecast/media/cma/ipc_streamer/decoder_buffer_base_marshaller.cc
+++ b/chromecast/media/cma/ipc_streamer/decoder_buffer_base_marshaller.cc
@@ -24,6 +24,7 @@ class DecoderBufferFromMsg : public DecoderBufferBase {
   void Initialize();
 
   // DecoderBufferBase implementation.
+  int stream_id() const override;
   base::TimeDelta timestamp() const override;
   const uint8* data() const override;
   uint8* writable_data() const override;
@@ -37,6 +38,9 @@ class DecoderBufferFromMsg : public DecoderBufferBase {
   // Indicates whether this is an end of stream frame.
   bool is_eos_;
 
+  // Stream Id this decoder buffer belonging to.
+  int stream_id_;
+
   // Frame timestamp.
   base::TimeDelta pts_;
 
@@ -56,6 +60,7 @@ class DecoderBufferFromMsg : public DecoderBufferBase {
 DecoderBufferFromMsg::DecoderBufferFromMsg(
     scoped_ptr<MediaMessage> msg)
     : is_eos_(true),
+      stream_id_(-1),
       msg_(msg.Pass()),
       data_(NULL) {
   CHECK(msg_);
@@ -71,6 +76,8 @@ void DecoderBufferFromMsg::Initialize() {
   if (is_eos_)
     return;
 
+  CHECK(msg_->ReadPod(&stream_id_));
+
   int64 pts_internal = 0;
   CHECK(msg_->ReadPod(&pts_internal));
   pts_ = base::TimeDelta::FromInternalValue(pts_internal);
@@ -99,6 +106,10 @@ void DecoderBufferFromMsg::Initialize() {
   }
 }
 
+int DecoderBufferFromMsg::stream_id() const {
+  return stream_id_;
+}
+
 base::TimeDelta DecoderBufferFromMsg::timestamp() const {
   return pts_;
 }
@@ -135,6 +146,7 @@ void DecoderBufferBaseMarshaller::Write(
   if (buffer->end_of_stream())
     return;
 
+  CHECK(msg->WritePod(buffer->stream_id()));
   CHECK(msg->WritePod(buffer->timestamp().ToInternalValue()));
 
   bool has_decrypt_config =