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.
5 #ifndef MEDIA_MOJO_SERVICES_MOJO_DEMUXER_STREAM_ADAPTER_H_
6 #define MEDIA_MOJO_SERVICES_MOJO_DEMUXER_STREAM_ADAPTER_H_
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"
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 {
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();
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;
43 // mojo::DemuxerStreamClient implementation.
44 virtual void OnStreamReady(mojo::ScopedDataPipeConsumerHandle pipe) OVERRIDE;
45 virtual void OnAudioDecoderConfigChanged(
46 mojo::AudioDecoderConfigPtr config) OVERRIDE;
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);
54 // See constructor for descriptions.
55 mojo::DemuxerStreamPtr demuxer_stream_;
56 base::Closure stream_ready_cb_;
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_;
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_;
69 base::WeakPtrFactory<MojoDemuxerStreamAdapter> weak_factory_;
70 DISALLOW_COPY_AND_ASSIGN(MojoDemuxerStreamAdapter);
75 #endif // MEDIA_MOJO_SERVICES_MOJO_DEMUXER_STREAM_ADAPTER_H_