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     ::media::VideoRendererSink* video_renderer_sink) {
  34   if (!default_render_factory_) {
  35     // Chromecast doesn't have input audio devices, so leave this uninitialized
  36     ::media::AudioParameters input_audio_params;
  37     // TODO(servolk): Audio parameters are hardcoded for now, but in the future
  38     // either we need to obtain AudioHardwareConfig from RenderThreadImpl,
  39     // or media renderer needs to figure out optimal audio parameters itself.
  40     const int kDefaultSamplingRate = 48000;
  41     const int kDefaultBitsPerSample = 16;
  42     // About 20ms of stereo (2 channels) 16bit (2 byte) audio
  43     int buffer_size = kDefaultSamplingRate * 20 * 2 * 2 / 1000;
  44     ::media::AudioParameters output_audio_params(
  45         ::media::AudioParameters::AUDIO_PCM_LOW_LATENCY,
  46         ::media::CHANNEL_LAYOUT_STEREO,
  47         kDefaultSamplingRate, kDefaultBitsPerSample,
  48         buffer_size, ::media::AudioParameters::NO_EFFECTS);
  49     ::media::AudioHardwareConfig audio_config(input_audio_params,
  50                                               output_audio_params);
  51
  52     default_render_factory_.reset(new ::media::DefaultRendererFactory(
  53         media_log_, /*gpu_factories*/ nullptr, audio_config));
  54   }
  55
  56   DCHECK(default_render_factory_);
  57   // TODO(erickung): crbug.com/443956. Need to provide right LoadType.
  58   LoadType cma_load_type = kLoadTypeMediaSource;
  59   scoped_ptr<MediaPipeline> cma_media_pipeline(
  60       new MediaPipelineProxy(
  61           render_frame_id_,
  62           content::RenderThread::Get()->GetIOMessageLoopProxy(),
  63           cma_load_type));
  64   scoped_ptr<CmaRenderer> cma_renderer(
  65       new CmaRenderer(cma_media_pipeline.Pass(), video_renderer_sink));
  66   scoped_ptr<::media::Renderer> default_media_render(
  67       default_render_factory_->CreateRenderer(media_task_runner,
  68                                               audio_renderer_sink,
  69                                               video_renderer_sink));
  70   scoped_ptr<SwitchingMediaRenderer> media_renderer(new SwitchingMediaRenderer(
  71       default_media_render.Pass(), cma_renderer.Pass()));
  72   return media_renderer.Pass();
  73 }
  74
  75 }  // namespace media
  76 }  // namespace chromecast