Reland: Remove reference counting from media::VideoDecoder and friends.

webkit/media/filter_helpers.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 "webkit/media/filter_helpers.h"
-
-#include "base/bind.h"
-#include "base/command_line.h"
-#include "media/base/filter_collection.h"
-#include "media/base/media_switches.h"
-#include "media/filters/chunk_demuxer.h"
-#include "media/filters/ffmpeg_audio_decoder.h"
-#include "media/filters/ffmpeg_demuxer.h"
-#include "media/filters/ffmpeg_video_decoder.h"
-#include "media/filters/opus_audio_decoder.h"
-#include "media/filters/vpx_video_decoder.h"
-#include "third_party/WebKit/Source/Platform/chromium/public/WebURL.h"
-
-namespace webkit_media {
-
-void AddDefaultAudioDecoders(
-    const scoped_refptr<base::MessageLoopProxy>& message_loop,
-    ScopedVector<media::AudioDecoder>* audio_decoders) {
-  audio_decoders->push_back(new media::FFmpegAudioDecoder(message_loop));
-
-  const CommandLine* cmd_line = CommandLine::ForCurrentProcess();
-  if (cmd_line->HasSwitch(switches::kEnableOpusPlayback)) {
-    audio_decoders->push_back(new media::OpusAudioDecoder(message_loop));
-  }
-}
-
-// Constructs and adds the default video decoders to |filter_collection|.
-//
-// Note that decoders in the |filter_collection| are initialized in order.
-static void AddDefaultDecodersToCollection(
-    const scoped_refptr<base::MessageLoopProxy>& message_loop,
-    media::FilterCollection* filter_collection) {
-
-  scoped_refptr<media::FFmpegVideoDecoder> ffmpeg_video_decoder =
-      new media::FFmpegVideoDecoder(message_loop);
-  filter_collection->GetVideoDecoders()->push_back(ffmpeg_video_decoder);
-
-  // TODO(phajdan.jr): Remove ifdefs when libvpx with vp9 support is released
-  // (http://crbug.com/174287) .
-#if !defined(MEDIA_DISABLE_LIBVPX)
-  const CommandLine* cmd_line = CommandLine::ForCurrentProcess();
-  if (cmd_line->HasSwitch(switches::kEnableVp9Playback)) {
-    scoped_refptr<media::VpxVideoDecoder> vpx_video_decoder =
-        new media::VpxVideoDecoder(message_loop);
-    filter_collection->GetVideoDecoders()->push_back(vpx_video_decoder);
-  }
-#endif  // !defined(MEDIA_DISABLE_LIBVPX)
-}
-
-void BuildMediaSourceCollection(
-    const scoped_refptr<media::ChunkDemuxer>& demuxer,
-    const scoped_refptr<base::MessageLoopProxy>& message_loop,
-    media::FilterCollection* filter_collection) {
-  DCHECK(demuxer);
-  filter_collection->SetDemuxer(demuxer);
-
-  // Remove GPUVideoDecoder until it supports codec config changes.
-  // TODO(acolwell): Remove this once http://crbug.com/151045 is fixed.
-  DCHECK_LE(filter_collection->GetVideoDecoders()->size(), 1u);
-  filter_collection->GetVideoDecoders()->clear();
-
-  AddDefaultDecodersToCollection(message_loop, filter_collection);
-}
-
-void BuildDefaultCollection(
-    const scoped_refptr<media::DataSource>& data_source,
-    const scoped_refptr<base::MessageLoopProxy>& message_loop,
-    media::FilterCollection* filter_collection,
-    const media::FFmpegNeedKeyCB& need_key_cb) {
-  filter_collection->SetDemuxer(new media::FFmpegDemuxer(
-      message_loop, data_source, need_key_cb));
-
-  AddDefaultDecodersToCollection(message_loop, filter_collection);
-}
-
-}  // webkit_media