chromecast/renderer/media/chromecast_media_renderer_factory.cc

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chromecast/renderer/media/chromecast_media_renderer_factory.h"
   6
   7 #include "base/command_line.h"
   8 #include "chromecast/media/base/switching_media_renderer.h"
   9 #include "chromecast/media/cma/filters/cma_renderer.h"
  10 #include "chromecast/renderer/media/media_pipeline_proxy.h"
  11 #include "content/public/renderer/render_thread.h"
  12 #include "media/base/audio_hardware_config.h"
  13 #include "media/base/media_log.h"
  14 #include "media/renderers/default_renderer_factory.h"
  15 #include "media/renderers/gpu_video_accelerator_factories.h"
  16
  17 namespace chromecast {
  18 namespace media {
  19
  20 ChromecastMediaRendererFactory::ChromecastMediaRendererFactory(
  21     const scoped_refptr<::media::MediaLog>& media_log,
  22     int render_frame_id)
  23     : render_frame_id_(render_frame_id),
  24       media_log_(media_log) {
  25 }
  26
  27 ChromecastMediaRendererFactory::~ChromecastMediaRendererFactory() {
  28 }
  29
  30 scoped_ptr<::media::Renderer> ChromecastMediaRendererFactory::CreateRenderer(
  31     const scoped_refptr<base::SingleThreadTaskRunner>& media_task_runner,
  32     ::media::AudioRendererSink* audio_renderer_sink) {
  33   if (!default_render_factory_) {
  34     // Chromecast doesn't have input audio devices, so leave this uninitialized
  35     ::media::AudioParameters input_audio_params;
  36     // TODO(servolk): Audio parameters are hardcoded for now, but in the future
  37     // either we need to obtain AudioHardwareConfig from RenderThreadImpl,
  38     // or media renderer needs to figure out optimal audio parameters itself.
  39     const int kDefaultSamplingRate = 48000;
  40     const int kDefaultBitsPerSample = 16;
  41     // About 20ms of stereo (2 channels) 16bit (2 byte) audio
  42     int buffer_size = kDefaultSamplingRate * 20 * 2 * 2 / 1000;
  43     ::media::AudioParameters output_audio_params(
  44         ::media::AudioParameters::AUDIO_PCM_LOW_LATENCY,
  45         ::media::CHANNEL_LAYOUT_STEREO,
  46         kDefaultSamplingRate, kDefaultBitsPerSample,
  47         buffer_size, ::media::AudioParameters::NO_EFFECTS);
  48     ::media::AudioHardwareConfig audio_config(input_audio_params,
  49                                               output_audio_params);
  50
  51     default_render_factory_.reset(new ::media::DefaultRendererFactory(
  52         media_log_, /*gpu_factories*/ nullptr, audio_config));
  53   }
  54
  55   DCHECK(default_render_factory_);
  56   // TODO(erickung): crbug.com/443956. Need to provide right LoadType.
  57   LoadType cma_load_type = kLoadTypeMediaSource;
  58   scoped_ptr<MediaPipeline> cma_media_pipeline(
  59       new MediaPipelineProxy(
  60           render_frame_id_,
  61           content::RenderThread::Get()->GetIOMessageLoopProxy(),
  62           cma_load_type));
  63   scoped_ptr<CmaRenderer> cma_renderer(
  64       new CmaRenderer(cma_media_pipeline.Pass()));
  65   scoped_ptr<::media::Renderer> default_media_render(
  66       default_render_factory_->CreateRenderer(media_task_runner,
  67                                               audio_renderer_sink));
  68   scoped_ptr<SwitchingMediaRenderer> media_renderer(new SwitchingMediaRenderer(
  69       default_media_render.Pass(), cma_renderer.Pass()));
  70   return media_renderer.Pass();
  71 }
  72
  73 }  // namespace media
  74 }  // namespace chromecast