Revert r180578, r180591, and r180604 from 1410 branch.

media/base/filter_collection.cc

 // Copyright (c) 2012 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/base/filter_collection.h"
 
 #include "base/logging.h"
 #include "media/base/audio_decoder.h"
 #include "media/base/audio_renderer.h"
 #include "media/base/demuxer.h"
 #include "media/base/video_decoder.h"
 #include "media/base/video_renderer.h"
 
 namespace media {
 
 FilterCollection::FilterCollection() {}
 
 FilterCollection::~FilterCollection() {}
 
 void FilterCollection::SetDemuxer(const scoped_refptr<Demuxer>& demuxer) {
   demuxer_ = demuxer;
 }
 
 const scoped_refptr<Demuxer>& FilterCollection::GetDemuxer() {
   return demuxer_;
 }
 
-void FilterCollection::SetAudioRenderer(
-    scoped_ptr<AudioRenderer> audio_renderer) {
-  audio_renderer_ = audio_renderer.Pass();
+void FilterCollection::AddAudioRenderer(AudioRenderer* audio_renderer) {
+  audio_renderers_.push_back(audio_renderer);
 }
 
-scoped_ptr<AudioRenderer> FilterCollection::GetAudioRenderer() {
-  return audio_renderer_.Pass();
-}
-
-void FilterCollection::SetVideoRenderer(
-    scoped_ptr<VideoRenderer> video_renderer) {
-  video_renderer_ = video_renderer.Pass();
-}
-
-scoped_ptr<VideoRenderer> FilterCollection::GetVideoRenderer() {
-  return video_renderer_.Pass();
+void FilterCollection::AddVideoRenderer(VideoRenderer* video_renderer) {
+  video_renderers_.push_back(video_renderer);
 }
 
 void FilterCollection::Clear() {
   audio_decoders_.clear();
   video_decoders_.clear();
-  audio_renderer_.reset();
-  video_renderer_.reset();
+  audio_renderers_.clear();
+  video_renderers_.clear();
+}
+
+void FilterCollection::SelectAudioRenderer(scoped_refptr<AudioRenderer>* out) {
+  if (audio_renderers_.empty()) {
+    *out = NULL;
+    return;
+  }
+  *out = audio_renderers_.front();
+  audio_renderers_.pop_front();
+}
+
+void FilterCollection::SelectVideoRenderer(scoped_refptr<VideoRenderer>* out) {
+  if (video_renderers_.empty()) {
+    *out = NULL;
+    return;
+  }
+  *out = video_renderers_.front();
+  video_renderers_.pop_front();
 }
 
 FilterCollection::AudioDecoderList* FilterCollection::GetAudioDecoders() {
   return &audio_decoders_;
 }
 
 FilterCollection::VideoDecoderList* FilterCollection::GetVideoDecoders() {
   return &video_decoders_;
 }
 
 }  // namespace media