Switch from a DataPipe per DecoderBuffer to a single one.

media/mojo/services/mojo_demuxer_stream_adapter.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/mojo/services/mojo_demuxer_stream_adapter.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "media/base/decoder_buffer.h"
 #include "media/mojo/services/media_type_converters.h"
+#include "mojo/public/cpp/system/data_pipe.h"
 
 namespace media {
 
 MojoDemuxerStreamAdapter::MojoDemuxerStreamAdapter(
     mojo::DemuxerStreamPtr demuxer_stream,
     const base::Closure& stream_ready_cb)
     : demuxer_stream_(demuxer_stream.Pass()),
       stream_ready_cb_(stream_ready_cb),
       type_(DemuxerStream::UNKNOWN),
       weak_factory_(this) {
   DVLOG(1) << __FUNCTION__;
   demuxer_stream_.set_client(this);
 }
 
 MojoDemuxerStreamAdapter::~MojoDemuxerStreamAdapter() {
   DVLOG(1) << __FUNCTION__;
 }
 
 void MojoDemuxerStreamAdapter::Read(const DemuxerStream::ReadCB& read_cb) {
   DVLOG(3) << __FUNCTION__;
   // We shouldn't be holding on to a previous callback if a new Read() came in.
   DCHECK(read_cb_.is_null());
+
+  DCHECK(stream_pipe_.is_valid());
   read_cb_ = read_cb;
   demuxer_stream_->Read(base::Bind(&MojoDemuxerStreamAdapter::OnBufferReady,
                                    weak_factory_.GetWeakPtr()));
 }
 
 AudioDecoderConfig MojoDemuxerStreamAdapter::audio_decoder_config() {
   DCHECK_EQ(type_, DemuxerStream::AUDIO);
   DCHECK(!audio_config_queue_.empty());
   return audio_config_queue_.front();
 }
@@ skipping 18 matching lines @@
 
 VideoRotation MojoDemuxerStreamAdapter::video_rotation() {
   NOTIMPLEMENTED();
   return VIDEO_ROTATION_0;
 }
 
 // TODO(xhwang): Pass liveness here.
 void MojoDemuxerStreamAdapter::OnStreamReady(
     mojo::ScopedDataPipeConsumerHandle pipe) {
   DVLOG(1) << __FUNCTION__;
-  // TODO(tim): We don't support pipe streaming yet.
-  DCHECK(!pipe.is_valid());
+  DCHECK(pipe.is_valid());
   DCHECK_NE(type_, DemuxerStream::UNKNOWN);
+  stream_pipe_ = pipe.Pass();
   stream_ready_cb_.Run();
 }
 
 void MojoDemuxerStreamAdapter::OnAudioDecoderConfigChanged(
     mojo::AudioDecoderConfigPtr config) {
   DCHECK(type_ == DemuxerStream::UNKNOWN || type_ == DemuxerStream::AUDIO)
       << type_;
   type_ = DemuxerStream::AUDIO;
 
   audio_config_queue_.push(config.To<AudioDecoderConfig>());
@@ skipping 17 matching lines @@
     read_cb_.Reset();
   }
 }
 
 void MojoDemuxerStreamAdapter::OnBufferReady(
     mojo::DemuxerStream::Status status,
     mojo::MediaDecoderBufferPtr buffer) {
   DVLOG(3) << __FUNCTION__;
   DCHECK(!read_cb_.is_null());
   DCHECK_NE(type_, DemuxerStream::UNKNOWN);
+  DCHECK(stream_pipe_.is_valid());
 
   DemuxerStream::Status media_status(
       static_cast<DemuxerStream::Status>(status));
   scoped_refptr<DecoderBuffer> media_buffer(
       buffer.To<scoped_refptr<DecoderBuffer>>());
 
   if (status == mojo::DemuxerStream::STATUS_CONFIG_CHANGED) {
     DCHECK(!media_buffer.get());
 
     // If the configuration queue is empty we need to wait for a config change
     // event before invoking |read_cb_|.
 
     if (type_ == DemuxerStream::AUDIO) {
       audio_config_queue_.pop();
       if (audio_config_queue_.empty())
         return;
     } else if (type_ == DemuxerStream::VIDEO) {
       video_config_queue_.pop();
       if (video_config_queue_.empty())
         return;
     }
+  } else if (status == mojo::DemuxerStream::STATUS_OK) {
+    DCHECK_GT(media_buffer->data_size(), 0);
+
+    // Read the inner data for the DecoderBuffer from our DataPipe.
+    uint32_t num_bytes = media_buffer->data_size();
+    CHECK_EQ(ReadDataRaw(stream_pipe_.get(), media_buffer->writable_data(),
+                         &num_bytes, MOJO_READ_DATA_FLAG_ALL_OR_NONE),
+             MOJO_RESULT_OK);
+    CHECK_EQ(num_bytes, static_cast<uint32_t>(media_buffer->data_size()));
   }
 
   read_cb_.Run(media_status, media_buffer);
   read_cb_.Reset();
 }
 
 }  // namespace media