example/pc_speaker/sound_api.h

   1 #ifndef _SND_API_
   2 #define _SND_API_
   3
   4
   5
   6 /*
   7  * sound API
   8  */
   9
  10 /*
  11  * default set is the sample rate 44100, 16 bits, 2 channel
  12  * umute
  13  */
  14 int32_t snd_init(void);
  15
  16 /*
  17  * write samples to device
  18  * must have correct set before write
  19  */
  20 int32_t snd_write(uint8_t * pcmStream, uint32_t pcmCnt);
  21
  22 /*
  23  * collect resources of sound device
  24  */
  25 int32_t snd_deinit(void);
  26
  27 /*
  28  * set pcm sound format: sample rate, bit width, channel number
  29  */
  30 int32_t snd_set_format(uint32_t sampleRate, uint8_t bitWidth, uint8_t chNum);
  31
  32 /*
  33  * mute sound device
  34  */
  35 int32_t snd_mute(void);
  36 /*
  37  * umute device
  38  */
  39 int32_t snd_umute(void);
  40
  41 /*
  42  * turn up sound volume
  43  */
  44 int32_t snd_vol_up(void);
  45
  46 /*
  47  * turn down sound volume
  48  */
  49 int32_t snd_vol_down(void);
  50 #endif