[PPAPI] Pepper MediaStream API audio track implementation and example.

content/renderer/pepper/pepper_media_stream_video_track_host.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 "content/renderer/pepper/pepper_media_stream_video_track_host.h"
 
 #include "base/logging.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/ppb_video_frame.h"
 #include "ppapi/shared_impl/media_stream_frame.h"
@@ skipping 60 matching lines @@
     return;
 
   if (frame_size_ != frame->coded_size() || frame_format_ != frame->format()) {
     frame_size_ = frame->coded_size();
     frame_format_ = frame->format();
     // TODO(penghuang): Support changing |frame_size_| & |frame_format_| more
     // than once.
     DCHECK(!frame_data_size_);
     frame_data_size_ = VideoFrame::AllocationSize(frame_format_, frame_size_);
     int32_t size = sizeof(ppapi::MediaStreamFrame::Video) + frame_data_size_;
-    InitFrames(kNumberOfFrames, size);
+    bool result = InitFrames(kNumberOfFrames, size);
+    // TODO(penghuang): Send PP_ERROR_NOMEMORY to plugin.
+    CHECK(result);
   }
 
   int32_t index = frame_buffer()->DequeueFrame();
   // Drop frames if the underlying buffer is full.
   if (index < 0)
     return;
 
   // TODO(penghuang): support format conversion and size scaling.
   ppapi::MediaStreamFrame::Video* ppframe =
       &(frame_buffer()->GetFramePointer(index)->video);
@@ skipping 27 matching lines @@
 }
 
 void PepperMediaStreamVideoTrackHost::DidConnectPendingHostToResource() {
   if (!connected_) {
     MediaStreamVideoSink::AddToVideoTrack(this, track_);
     connected_ = true;
   }
 }
 
 }  // namespace content