media/mojo/services/demuxer_stream_provider_shim.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_DEMUXER_STREAM_PROVIDER_SHIM_H_
   6 #define MEDIA_MOJO_SERVICES_DEMUXER_STREAM_PROVIDER_SHIM_H_
   7
   8 #include "base/callback.h"
   9 #include "base/memory/scoped_vector.h"
  10 #include "base/memory/weak_ptr.h"
  11 #include "media/base/demuxer_stream_provider.h"
  12 #include "media/mojo/services/mojo_demuxer_stream_adapter.h"
  13
  14 namespace media {
  15
  16 // DemuxerStreamProvider shim for interfaces::DemuxerStreams.
  17 class DemuxerStreamProviderShim : public DemuxerStreamProvider {
  18  public:
  19   // Constructs the shim; at least a single audio or video stream must be
  20   // provided.  |demuxer_ready_cb| will be called once the streams have been
  21   // initialized.  Calling any method before then is an error.
  22   DemuxerStreamProviderShim(interfaces::DemuxerStreamPtr audio,
  23                             interfaces::DemuxerStreamPtr video,
  24                             const base::Closure& demuxer_ready_cb);
  25   ~DemuxerStreamProviderShim() override;
  26
  27   // DemuxerStreamProvider interface.
  28   DemuxerStream* GetStream(DemuxerStream::Type type) override;
  29
  30  private:
  31   // Called as each interfaces::DemuxerStream becomes ready.  Once all streams
  32   // are ready it will fire the |demuxer_ready_cb_| provided during
  33   // construction.
  34   void OnStreamReady();
  35
  36   // Stored copy the ready callback provided during construction; cleared once
  37   // all streams are ready.
  38   base::Closure demuxer_ready_cb_;
  39
  40   // Scoped container for demuxer stream adapters which interface with the
  41   // mojo level demuxer streams.  |streams_ready_| tracks how many streams are
  42   // ready and is used by OnStreamReady() to know when |demuxer_ready_cb_|
  43   // should be fired.
  44   ScopedVector<MojoDemuxerStreamAdapter> streams_;
  45   size_t streams_ready_;
  46
  47   // WeakPtrFactorys must always be the last member variable.
  48   base::WeakPtrFactory<DemuxerStreamProviderShim> weak_factory_;
  49
  50   DISALLOW_COPY_AND_ASSIGN(DemuxerStreamProviderShim);
  51 };
  52
  53 }  // namespace media
  54
  55 #endif  // MEDIA_MOJO_SERVICES_DEMUXER_STREAM_PROVIDER_SHIM_H_