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

   1 /*
   2  * Copyright 2008 Stephan Aßmus <superstippi@gmx.de>
   3  * All rights reserved. Distributed under the terms of the MIT licensce.
   4  */
   5 #ifndef AUDIO_VOLUME_CONVERTER_H
   6 #define AUDIO_VOLUME_CONVERTER_H
   7
   8
   9 /*! This AudioReader just filters the volume. It depends on floating point
  10  *      audio format.
  11 */
  12
  13
  14 #include "AudioReader.h"
  15
  16
  17 class AudioVolumeConverter : public AudioReader {
  18 public:
  19                                                                 AudioVolumeConverter(AudioReader* source,
  20                                                                         float volume = 1.0);
  21         virtual                                         ~AudioVolumeConverter();
  22
  23         virtual bigtime_t                       InitialLatency() const;
  24         virtual status_t                        Read(void* buffer, int64 pos, int64 frames);
  25
  26         virtual status_t                        InitCheck() const;
  27
  28                         AudioReader*            Source() const;
  29
  30                         void                            SetVolume(float volume);
  31                         float                           Volume() const;
  32
  33 protected:
  34                         AudioReader*            fSource;
  35                         float                           fVolume;
  36                         float                           fPreviousVolume;
  37 };
  38
  39 #endif  // AUDIO_VOLUME_CONVERTER_H