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 interfaces::DemuxerStreamPtr and exposes it as a DemuxerStream for
  21 // use by
  22 // media components.
  23 class MojoDemuxerStreamAdapter : public DemuxerStream {
  24  public:
  25   // |demuxer_stream| is connected to the interfaces::DemuxerStream that |this|
  26   // will
  27   //     become the client of.
  28   // |stream_ready_cb| will be invoked when |demuxer_stream| has fully
  29   //     initialized and |this| is ready for use.
  30   // NOTE: Illegal to call any methods until |stream_ready_cb| is invoked.
  31   MojoDemuxerStreamAdapter(interfaces::DemuxerStreamPtr demuxer_stream,
  32                            const base::Closure& stream_ready_cb);
  33   ~MojoDemuxerStreamAdapter() override;
  34
  35   // DemuxerStream implementation.
  36   void Read(const ReadCB& read_cb) override;
  37   AudioDecoderConfig audio_decoder_config() override;
  38   VideoDecoderConfig video_decoder_config() override;
  39   Type type() const override;
  40   void EnableBitstreamConverter() override;
  41   bool SupportsConfigChanges() override;
  42   VideoRotation video_rotation() override;
  43
  44  private:
  45   void OnStreamReady(interfaces::DemuxerStream::Type type,
  46                      mojo::ScopedDataPipeConsumerHandle pipe,
  47                      interfaces::AudioDecoderConfigPtr audio_config,
  48                      interfaces::VideoDecoderConfigPtr video_config);
  49
  50   // The callback from |demuxer_stream_| that a read operation has completed.
  51   // |read_cb| is a callback from the client who invoked Read() on |this|.
  52   void OnBufferReady(interfaces::DemuxerStream::Status status,
  53                      interfaces::DecoderBufferPtr buffer,
  54                      interfaces::AudioDecoderConfigPtr audio_config,
  55                      interfaces::VideoDecoderConfigPtr video_config);
  56
  57   void UpdateConfig(interfaces::AudioDecoderConfigPtr audio_config,
  58                     interfaces::VideoDecoderConfigPtr video_config);
  59
  60   // See constructor for descriptions.
  61   interfaces::DemuxerStreamPtr demuxer_stream_;
  62   base::Closure stream_ready_cb_;
  63
  64   // The last ReadCB received through a call to Read().
  65   // Used to store the results of OnBufferReady() in the event it is called
  66   // with DemuxerStream::Status::kConfigChanged and we don't have an up to
  67   // date AudioDecoderConfig yet. In that case we can't forward the results
  68   // on to the caller of Read() until OnAudioDecoderConfigChanged is observed.
  69   DemuxerStream::ReadCB read_cb_;
  70
  71   // The current config.
  72   AudioDecoderConfig audio_config_;
  73   VideoDecoderConfig video_config_;
  74
  75   DemuxerStream::Type type_;
  76
  77   // DataPipe for deserializing the data section of DecoderBuffers from.
  78   mojo::ScopedDataPipeConsumerHandle stream_pipe_;
  79
  80   base::WeakPtrFactory<MojoDemuxerStreamAdapter> weak_factory_;
  81   DISALLOW_COPY_AND_ASSIGN(MojoDemuxerStreamAdapter);
  82 };
  83
  84 }  // namespace media
  85
  86 #endif  // MEDIA_MOJO_SERVICES_MOJO_DEMUXER_STREAM_ADAPTER_H_