media/base/demuxer_stream.h

   1 // Copyright (c) 2012 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_BASE_DEMUXER_STREAM_H_
   6 #define MEDIA_BASE_DEMUXER_STREAM_H_
   7
   8 #include "base/callback.h"
   9 #include "base/memory/ref_counted.h"
  10 #include "media/base/media_export.h"
  11
  12 namespace media {
  13
  14 class AudioDecoderConfig;
  15 class Buffer;
  16 class VideoDecoderConfig;
  17
  18 class MEDIA_EXPORT DemuxerStream
  19     : public base::RefCountedThreadSafe<DemuxerStream> {
  20  public:
  21   enum Type {
  22     UNKNOWN,
  23     AUDIO,
  24     VIDEO,
  25     NUM_TYPES,  // Always keep this entry as the last one!
  26   };
  27
  28   // Request a buffer to returned via the provided callback.
  29   //
  30   // Non-NULL buffer pointers will contain media data or signal the end of the
  31   // stream. A NULL pointer indicates an aborted Read(). This can happen if the
  32   // DemuxerStream gets flushed and doesn't have any more data to return.
  33   typedef base::Callback<void(const scoped_refptr<Buffer>&)> ReadCB;
  34   virtual void Read(const ReadCB& read_cb) = 0;
  35
  36   // Returns the audio decoder configuration. It is an error to call this method
  37   // if type() != AUDIO.
  38   virtual const AudioDecoderConfig& audio_decoder_config() = 0;
  39
  40   // Returns the video decoder configuration. It is an error to call this method
  41   // if type() != VIDEO.
  42   virtual const VideoDecoderConfig& video_decoder_config() = 0;
  43
  44   // Returns the type of stream.
  45   virtual Type type() = 0;
  46
  47   virtual void EnableBitstreamConverter() = 0;
  48
  49  protected:
  50   friend class base::RefCountedThreadSafe<DemuxerStream>;
  51   virtual ~DemuxerStream();
  52 };
  53
  54 }  // namespace media
  55
  56 #endif  // MEDIA_BASE_DEMUXER_STREAM_H_