src/apps/mediaplayer/media_node_framework/audio/AudioReader.h

   1 /*
   2  * Copyright © 2000-2006 Ingo Weinhold <ingo_weinhold@gmx.de>
   3  * All rights reserved. Distributed under the terms of the MIT licensce.
   4  */
   5 #ifndef AUDIO_READER_H
   6 #define AUDIO_READER_H
   7
   8 #include <MediaDefs.h>
   9
  10 class AudioReader {
  11 public:
  12                                                                 AudioReader();
  13                                                                 AudioReader(const media_format& format);
  14         virtual                                         ~AudioReader();
  15
  16         virtual status_t                        InitCheck() const;
  17
  18                         void                            SetFormat(const media_format& format);
  19                         const media_format&     Format() const;
  20
  21         virtual bigtime_t                       InitialLatency() const = 0;
  22         virtual status_t                        Read(void* buffer, int64 pos, int64 frames) = 0;
  23
  24                         void                            SetOutOffset(int64 offset);
  25                         int64                           OutOffset() const;
  26
  27                         int64                           FrameForTime(bigtime_t time) const;
  28                         bigtime_t                       TimeForFrame(int64 frame) const;
  29
  30 protected:
  31                         void*                           ReadSilence(void* buffer, int64 frames) const;
  32                         void*                           SkipFrames(void* buffer, int64 frames) const;
  33                         void                            ReverseFrames(void* buffer,
  34                                                                         int64 frames) const;
  35
  36 protected:
  37                         media_format            fFormat;
  38                         int64                           fOutOffset;
  39 };
  40
  41 #endif  // AUDIO_READER_H