[Cast] VideoFrameFactory interface to vend frames with encoder affinity.

media/cast/sender/video_sender.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/cast/sender/video_sender.h"
 
 #include <algorithm>
 #include <cstring>
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "media/cast/cast_defines.h"
 #include "media/cast/net/cast_transport_config.h"
 #include "media/cast/sender/external_video_encoder.h"
 #include "media/cast/sender/video_encoder_impl.h"
+#include "media/cast/sender/video_frame_factory.h"
 
 namespace media {
 namespace cast {
 
 namespace {
 
 // The following two constants are used to adjust the target
 // playout delay (when allowed). They were calculated using
 // a combination of cast_benchmark runs and manual testing.
 //
@@ skipping 158 matching lines @@
                      bitrate))) {
     frames_in_encoder_++;
     duration_in_encoder_ += duration_added_by_next_frame;
     last_enqueued_frame_rtp_timestamp_ = rtp_timestamp;
     last_enqueued_frame_reference_time_ = reference_time;
   } else {
     VLOG(1) << "Encoder rejected a frame.  Skipping...";
   }
 }
 
+scoped_ptr<VideoFrameFactory> VideoSender::CreateVideoFrameFactory() {
+  DCHECK(cast_initialization_status_ == STATUS_VIDEO_INITIALIZED);
+  DCHECK(video_encoder_.get()) << "Invalid state";
+  return video_encoder_->CreateVideoFrameFactory();
+}
+
 int VideoSender::GetNumberOfFramesInEncoder() const {
   return frames_in_encoder_;
 }
 
 base::TimeDelta VideoSender::GetInFlightMediaDuration() const {
   if (GetUnacknowledgedFrameCount() > 0) {
     const uint32 oldest_unacked_frame_id = latest_acked_frame_id_ + 1;
     return last_enqueued_frame_reference_time_ -
         GetRecordedReferenceTime(oldest_unacked_frame_id);
   } else {
@@ skipping 21 matching lines @@
   DCHECK_GE(frames_in_encoder_, 0);
 
   duration_in_encoder_ =
       last_enqueued_frame_reference_time_ - encoded_frame->reference_time;
 
   SendEncodedFrame(encoder_bitrate, encoded_frame.Pass());
 }
 
 }  // namespace cast
 }  // namespace media