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 "media/base/filter_collection.h"
#include "media/base/message_loop_factory.h"
#include "media/filters/chunk_demuxer.h"
#include "media/filters/dummy_demuxer.h"
#include "media/filters/ffmpeg_audio_decoder.h"
#include "media/filters/ffmpeg_demuxer.h"
#include "media/filters/ffmpeg_video_decoder.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebURL.h"
#include "webkit/media/media_stream_client.h"

namespace webkit_media {

// Constructs and adds the default audio/video decoders to |filter_collection|.
static void AddDefaultDecodersToCollection(
    media::MessageLoopFactory* message_loop_factory,
    media::FilterCollection* filter_collection,
    media::Decryptor* decryptor) {
  filter_collection->AddAudioDecoder(new media::FFmpegAudioDecoder(
      base::Bind(&media::MessageLoopFactory::GetMessageLoop,
                 base::Unretained(message_loop_factory),
                 media::MessageLoopFactory::kDecoder)));

  scoped_refptr<media::FFmpegVideoDecoder> ffmpeg_video_decoder =
      new media::FFmpegVideoDecoder(
          base::Bind(&media::MessageLoopFactory::GetMessageLoop,
                     base::Unretained(message_loop_factory),
                     media::MessageLoopFactory::kDecoder),
          decryptor);
  filter_collection->GetVideoDecoders()->push_back(ffmpeg_video_decoder);
}

bool BuildMediaStreamCollection(const WebKit::WebURL& url,
                                MediaStreamClient* client,
                                media::MessageLoopFactory* message_loop_factory,
                                media::FilterCollection* filter_collection) {
  if (!client)
    return false;

  scoped_refptr<media::VideoDecoder> video_decoder = client->GetVideoDecoder(
      url, message_loop_factory);
  if (!video_decoder)
    return false;

  // Remove all other decoders and just use the MediaStream one.
  // NOTE: http://crbug.com/110800 is about replacing this ad-hockery with
  // something more designed.
  filter_collection->GetVideoDecoders()->clear();
  filter_collection->GetVideoDecoders()->push_back(video_decoder);

  filter_collection->SetDemuxer(new media::DummyDemuxer(true, false));

  return true;
}

void BuildMediaSourceCollection(
    const scoped_refptr<media::ChunkDemuxer>& demuxer,
    media::MessageLoopFactory* message_loop_factory,
    media::FilterCollection* filter_collection,
    media::Decryptor* decryptor) {
  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_factory, filter_collection,
                                 decryptor);
}

void BuildDefaultCollection(
    const scoped_refptr<media::DataSource>& data_source,
    media::MessageLoopFactory* message_loop_factory,
    media::FilterCollection* filter_collection,
    media::Decryptor* decryptor) {
  filter_collection->SetDemuxer(new media::FFmpegDemuxer(
      message_loop_factory->GetMessageLoop(
          media::MessageLoopFactory::kPipeline),
      data_source));

  AddDefaultDecodersToCollection(message_loop_factory, filter_collection,
                                 decryptor);
}

}  // webkit_media