Introduce media::RendererFactory interface.

media/filters/default_renderer_factory.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/filters/default_renderer_factory.h"
+
+#include "base/bind.h"
+#include "base/single_thread_task_runner.h"
+#include "media/filters/audio_renderer_impl.h"
+#include "media/filters/ffmpeg_audio_decoder.h"
+#include "media/filters/ffmpeg_video_decoder.h"
+#include "media/filters/gpu_video_accelerator_factories.h"
+#include "media/filters/gpu_video_decoder.h"
+#include "media/filters/opus_audio_decoder.h"
+#include "media/filters/renderer_impl.h"
+#include "media/filters/video_renderer_impl.h"
+#include "media/filters/vpx_video_decoder.h"
+
+namespace media {
+
+// TODO(xhwang): We are abusing CreateMediaSourceErrorEvent() in a lot of places
+// that are not MediaSource related. Fix this in a separate CL.
+static void LogError(const scoped_refptr<MediaLog>& media_log,
+                     const std::string& error) {
+  media_log->AddEvent(media_log->CreateMediaSourceErrorEvent(error));
+}
+
+DefaultRendererFactory::DefaultRendererFactory(
+    const scoped_refptr<MediaLog>& media_log,
+    const scoped_refptr<GpuVideoAcceleratorFactories>& gpu_factories,
+    const AudioHardwareConfig& audio_hardware_config)
+    : media_log_(media_log),
+      gpu_factories_(gpu_factories),
+      audio_hardware_config_(audio_hardware_config) {
+}
+
+DefaultRendererFactory::~DefaultRendererFactory() {
+}
+
+// TODO(xhwang): Use RendererConfig to customize what decoders we use.
+scoped_ptr<Renderer> DefaultRendererFactory::CreateRenderer(
+    const scoped_refptr<base::SingleThreadTaskRunner>& media_task_runner,
+    AudioRendererSink* audio_renderer_sink) {
+  DCHECK(audio_renderer_sink);
+
+  // Create our audio decoders and renderer.
+  ScopedVector<AudioDecoder> audio_decoders;
+
+  audio_decoders.push_back(new FFmpegAudioDecoder(
+      media_task_runner, base::Bind(&LogError, media_log_)));
+  audio_decoders.push_back(new OpusAudioDecoder(media_task_runner));
+
+  scoped_ptr<AudioRenderer> audio_renderer(new AudioRendererImpl(
+      media_task_runner, audio_renderer_sink, audio_decoders.Pass(),
+      audio_hardware_config_, media_log_));
+
+  // Create our video decoders and renderer.
+  ScopedVector<VideoDecoder> video_decoders;
+
+  // |gpu_factories_| requires that its entry points be called on its
+  // |GetTaskRunner()|.  Since |pipeline_| will own decoders created from the
+  // factories, require that their message loops are identical.
+  DCHECK(!gpu_factories_.get() ||
+         (gpu_factories_->GetTaskRunner() == media_task_runner.get()));
+
+  if (gpu_factories_.get())
+    video_decoders.push_back(new GpuVideoDecoder(gpu_factories_));
+
+#if !defined(MEDIA_DISABLE_LIBVPX)
+  video_decoders.push_back(new VpxVideoDecoder(media_task_runner));
+#endif  // !defined(MEDIA_DISABLE_LIBVPX)
+
+  video_decoders.push_back(new FFmpegVideoDecoder(media_task_runner));
+
+  scoped_ptr<VideoRenderer> video_renderer(new VideoRendererImpl(
+      media_task_runner, video_decoders.Pass(), true, media_log_));
+
+  // Create renderer.
+  return scoped_ptr<Renderer>(new RendererImpl(
+      media_task_runner, audio_renderer.Pass(), video_renderer.Pass()));
+}
+
+}  // namespace media