media/mojo/services/mojo_demuxer_stream_adapter.h

   1 // Copyright 2014 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 MEDIA_MOJO_SERVICES_MOJO_DEMUXER_STREAM_ADAPTER_H_
   6 #define MEDIA_MOJO_SERVICES_MOJO_DEMUXER_STREAM_ADAPTER_H_
   7
   8 #include <queue>
   9
  10 #include "base/memory/weak_ptr.h"
  11 #include "media/base/audio_decoder_config.h"
  12 #include "media/base/demuxer_stream.h"
  13 #include "media/base/video_decoder_config.h"
  14 #include "media/mojo/interfaces/demuxer_stream.mojom.h"
  15
  16 namespace media {
  17
  18 // This class acts as a MojoRendererService-side stub for a real DemuxerStream
  19 // that is part of a Pipeline in a remote application. Roughly speaking, it
  20 // takes a mojo::DemuxerStreamPtr and exposes it as a DemuxerStream for use by
  21 // media components.
  22 class MojoDemuxerStreamAdapter : public DemuxerStream,
  23                                  public mojo::DemuxerStreamClient {
  24  public:
  25   // |demuxer_stream| is connected to the mojo::DemuxerStream that |this| will
  26   //     become the client of.
  27   // |stream_ready_cb| will be invoked when |stream| has fully initialized
  28   //     and |this| is ready for use.
  29   // NOTE: Illegal to call any methods until |stream_ready_cb| is invoked.
  30   MojoDemuxerStreamAdapter(mojo::DemuxerStreamPtr demuxer_stream,
  31                            const base::Closure& stream_ready_cb);
  32   ~MojoDemuxerStreamAdapter() override;
  33
  34   // DemuxerStream implementation.
  35   void Read(const ReadCB& read_cb) override;
  36   AudioDecoderConfig audio_decoder_config() override;
  37   VideoDecoderConfig video_decoder_config() override;
  38   Type type() const override;
  39   void EnableBitstreamConverter() override;
  40   bool SupportsConfigChanges() override;
  41   VideoRotation video_rotation() override;
  42
  43   // mojo::DemuxerStreamClient implementation.
  44   void OnStreamReady(mojo::ScopedDataPipeConsumerHandle pipe) override;
  45   void OnAudioDecoderConfigChanged(mojo::AudioDecoderConfigPtr config) override;
  46   void OnVideoDecoderConfigChanged(mojo::VideoDecoderConfigPtr config) override;
  47
  48  private:
  49   // The callback from |demuxer_stream_| that a read operation has completed.
  50   // |read_cb| is a callback from the client who invoked Read() on |this|.
  51   void OnBufferReady(mojo::DemuxerStream::Status status,
  52                      mojo::MediaDecoderBufferPtr buffer);
  53
  54   // See constructor for descriptions.
  55   mojo::DemuxerStreamPtr demuxer_stream_;
  56   base::Closure stream_ready_cb_;
  57
  58   // The last ReadCB received through a call to Read().
  59   // Used to store the results of OnBufferReady() in the event it is called
  60   // with DemuxerStream::Status::kConfigChanged and we don't have an up to
  61   // date AudioDecoderConfig yet. In that case we can't forward the results
  62   // on to the caller of Read() until OnAudioDecoderConfigChanged is observed.
  63   DemuxerStream::ReadCB read_cb_;
  64
  65   // The front of the queue is the current config. We pop when we observe
  66   // DemuxerStatus::CONFIG_CHANGED.
  67   std::queue<AudioDecoderConfig> audio_config_queue_;
  68   std::queue<VideoDecoderConfig> video_config_queue_;
  69
  70   DemuxerStream::Type type_;
  71
  72   // DataPipe for deserializing the data section of DecoderBuffers from.
  73   mojo::ScopedDataPipeConsumerHandle stream_pipe_;
  74
  75   base::WeakPtrFactory<MojoDemuxerStreamAdapter> weak_factory_;
  76   DISALLOW_COPY_AND_ASSIGN(MojoDemuxerStreamAdapter);
  77 };
  78
  79 }  // namespace media
  80
  81 #endif  // MEDIA_MOJO_SERVICES_MOJO_DEMUXER_STREAM_ADAPTER_H_