chromecast/media/base/switching_media_renderer.h

   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 #ifndef CHROMECAST_MEDIA_BASE_SWITCHING_MEDIA_RENDERER_H_
   6 #define CHROMECAST_MEDIA_BASE_SWITCHING_MEDIA_RENDERER_H_
   7
   8 #include "base/macros.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "media/base/renderer.h"
  11
  12 namespace media {
  13 class DemuxerStreamProvider;
  14 }
  15
  16 namespace chromecast {
  17 namespace media {
  18
  19 // Chromecast's custom media renderer which is capable of selecting an
  20 // appropriate media renderer at runtime depending on the content.
  21 // We'll look at media types of media streams present in DemuxerStreamProvider
  22 // and will use either CMA-based renderer (for media types that are supported by
  23 // our hardware decoder - H264 and VP8 video, AAC and Vorbis audio) or the
  24 // default Chrome media renderer (this will allow us to support audio codecs
  25 // like FLAC and Opus, which are decoded in software).
  26 class SwitchingMediaRenderer : public ::media::Renderer {
  27  public:
  28   SwitchingMediaRenderer(
  29       scoped_ptr<::media::Renderer> default_renderer,
  30       scoped_ptr<::media::Renderer> cma_renderer);
  31   ~SwitchingMediaRenderer() override;
  32
  33   // ::media::Renderer implementation:
  34   void Initialize(
  35       ::media::DemuxerStreamProvider* demuxer_stream_provider,
  36       const ::media::PipelineStatusCB& init_cb,
  37       const ::media::StatisticsCB& statistics_cb,
  38       const ::media::BufferingStateCB& buffering_state_cb,
  39       const base::Closure& ended_cb,
  40       const ::media::PipelineStatusCB& error_cb,
  41       const base::Closure& waiting_for_decryption_key_cb) override;
  42   void SetCdm(::media::CdmContext* cdm_context,
  43               const ::media::CdmAttachedCB& cdm_attached_cb) override;
  44   void Flush(const base::Closure& flush_cb) override;
  45   void StartPlayingFrom(base::TimeDelta time) override;
  46   void SetPlaybackRate(double playback_rate) override;
  47   void SetVolume(float volume) override;
  48   base::TimeDelta GetMediaTime() override;
  49   bool HasAudio() override;
  50   bool HasVideo() override;
  51
  52  private:
  53   // Returns the pointer to the actual renderer being used
  54   ::media::Renderer* GetRenderer() const;
  55
  56   ::media::DemuxerStreamProvider* demuxer_stream_provider_;
  57   scoped_ptr<::media::Renderer> default_renderer_;
  58   scoped_ptr<::media::Renderer> cma_renderer_;
  59
  60   DISALLOW_COPY_AND_ASSIGN(SwitchingMediaRenderer);
  61 };
  62
  63 }  // namespace media
  64 }  // namespace chromecast
  65
  66 #endif  // CHROMECAST_MEDIA_BASE_SWITCHING_MEDIA_RENDERER_H_