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 19 // media::DemuxerStream that is part of a media::Pipeline in a remote 20 // application. Roughly speaking, it takes a mojo::DemuxerStreamPtr and exposes 21 // it as a media::DemuxerStream for use by media components. 22 class MojoDemuxerStreamAdapter : public media::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 virtual ~MojoDemuxerStreamAdapter(); 33 34 // media::DemuxerStream implementation. 35 virtual void Read(const ReadCB& read_cb) OVERRIDE; 36 virtual AudioDecoderConfig audio_decoder_config() OVERRIDE; 37 virtual VideoDecoderConfig video_decoder_config() OVERRIDE; 38 virtual Type type() OVERRIDE; 39 virtual void EnableBitstreamConverter() OVERRIDE; 40 virtual bool SupportsConfigChanges() OVERRIDE; 41 virtual VideoRotation video_rotation() OVERRIDE; 42 43 // mojo::DemuxerStreamClient implementation. 44 virtual void OnStreamReady(mojo::ScopedDataPipeConsumerHandle pipe) OVERRIDE; 45 virtual void OnAudioDecoderConfigChanged( 46 mojo::AudioDecoderConfigPtr 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<media::AudioDecoderConfig> config_queue_; 68 69 base::WeakPtrFactory<MojoDemuxerStreamAdapter> weak_factory_; 70 DISALLOW_COPY_AND_ASSIGN(MojoDemuxerStreamAdapter); 71 }; 72 73 } // namespace media 74 75 #endif // MEDIA_MOJO_SERVICES_MOJO_DEMUXER_STREAM_ADAPTER_H_ 76