alsa-lib/test/switches.c

#include <stdio.h>
#include <string.h>
#include "../include/asoundlib.h"

const char *get_type( unsigned int type )
{
  switch ( type ) {
    case 0: return "Boolean";
    case 1: return "Byte";
    case 2: return "Word";
    case 3: return "DWord";
    case 4: return "User";
    default:
      return "Unknown";
  }
}

void main( void )
{
  int cards, card, device, direction, idx, count, err;
  void *handle, *chandle;
  struct snd_ctl_hw_info info;
  struct snd_ctl_switch ctl_switch;
  snd_mixer_switch_t mixer_switch;
  snd_pcm_info_t pcm_info;
  snd_pcm_switch_t pcm_switch;
  snd_rawmidi_switch_t rmidi_switch;
  snd_rawmidi_info_t rmidi_info;
  
  cards = snd_cards();
  printf( "Detected %i soundcard%s...\n", cards, cards > 1 ? "s" : "" );
  if ( cards <= 0 ) {
    printf( "Giving up...\n" );
    return;
  }
  
  /* control interface */
  for ( card = 0; card < cards; card++ ) {
    if ( (err = snd_ctl_open( &handle, card )) < 0 ) {
      printf( "CTL open error: %s\n", snd_strerror( err ) );
      continue;
    }
    if ( (err = snd_ctl_hw_info( handle, &info )) < 0 ) {
      printf( "CTL hw info error: %s\n", snd_strerror( err ) );
      continue;
    }
    if ( (count = snd_ctl_switches( handle )) < 0 ) {
      printf( "CTL switches error: %s\n", snd_strerror( count ) );
      continue;
    }
    for ( idx = 0; idx < count; idx++ ) {
      if ( (err = snd_ctl_switch_read( handle, idx, &ctl_switch )) < 0 ) {
        printf( "CTL switch read error: %s\n", snd_strerror( count ) );
        continue;
      }
      printf( "CTL switch: '%s' %s (%i-%i)\n", ctl_switch.name, get_type( ctl_switch.type ), ctl_switch.low, ctl_switch.high );
      if ( (err = snd_ctl_switch_write( handle, idx, &ctl_switch )) < 0 ) {
        printf( "CTL switch write error: %s\n", snd_strerror( count ) );
        continue;
      }
    }
    if ( count <= 0 )
      printf( "No CTL switches detected for soundcard #%i '%s'...\n", idx, info.name );
    snd_ctl_close( handle );
  }

  /* mixer interface */
  for ( card = 0; card < cards; card++ ) {
    if ( (err = snd_ctl_open( &handle, card )) < 0 ) {
      printf( "CTL open error: %s\n", snd_strerror( err ) );
      continue;
    }
    if ( (err = snd_ctl_hw_info( handle, &info )) < 0 ) {
      printf( "CTL hw info error: %s\n", snd_strerror( err ) );
      continue;
    }
    snd_ctl_close( handle );
    for ( device = 0; device < info.mixerdevs; device++ ) {
      if ( (err = snd_mixer_open( &handle, card, device )) < 0 ) {
        printf( "Mixer open error: %s\n", snd_strerror( err ) );
        continue;
      }
      if ( (count = snd_mixer_switches( handle )) < 0 ) {
        printf( "Mixer switches error: %s\n", snd_strerror( count ) );
        continue;
      }
      for ( idx = 0; idx < count; idx++ ) {
        if ( (err = snd_mixer_switch_read( handle, idx, &mixer_switch )) < 0 ) {
          printf( "Mixer switch read error: %s\n", snd_strerror( count ) );
          continue;
        }
        printf( "Mixer switch: '%s' %s (%i-%i)\n", mixer_switch.name, get_type( mixer_switch.type ), mixer_switch.low, mixer_switch.high );
        if ( (err = snd_mixer_switch_write( handle, idx, &mixer_switch )) < 0 ) {
          printf( "Mixer switch write error: %s\n", snd_strerror( count ) );
          continue;
        }
      }
      if ( count <= 0 )
        printf( "No mixer switches detected for soundcard #%i '%s'...\n", idx, info.name );
      snd_mixer_close( handle );
    }
  }

  /* pcm switches */
  for ( card = 0; card < cards; card++ ) {
    if ( (err = snd_ctl_open( &chandle, card )) < 0 ) {
      printf( "CTL open error: %s\n", snd_strerror( err ) );
      continue;
    }
    if ( (err = snd_ctl_hw_info( chandle, &info )) < 0 ) {
      printf( "CTL hw info error: %s\n", snd_strerror( err ) );
      continue;
    }
    for ( device = 0; device < info.pcmdevs; device++ ) {
      if ( (err = snd_ctl_pcm_info( chandle, device, &pcm_info )) < 0 ) {
        printf( "CTL PCM info error: %s\n", snd_strerror( err ) );
        continue;
      }
      for ( direction = 0; direction < 2; direction++ ) {
        int (*switches)( void *handle );
        int (*switch_read)( void *handle, int switchn, snd_pcm_switch_t *data );
        int (*switch_write)( void *handle, int switchn, snd_pcm_switch_t *data );
        char *str;

        if ( !(pcm_info.flags & (!direction ? SND_PCM_INFO_PLAYBACK : SND_PCM_INFO_RECORD)) ) continue;
        if ( (err = snd_pcm_open( &handle, card, device, !direction ? SND_PCM_OPEN_PLAYBACK : SND_PCM_OPEN_RECORD )) < 0 ) {
          printf( "PCM open error: %s\n", snd_strerror( err ) );
          continue;
        }
        if ( !direction ) {
          switches = snd_pcm_playback_switches;
          switch_read = snd_pcm_playback_switch_read;
          switch_write = snd_pcm_playback_switch_write;
          str = "playback";
        } else {
          switches = snd_pcm_record_switches;
          switch_read = snd_pcm_record_switch_read;
          switch_write = snd_pcm_record_switch_write;
          str = "record";
        }
        if ( (count = switches( handle )) < 0 ) {
          printf( "PCM %s switches error: %s\n", str, snd_strerror( count ) );
          continue;
        }
        for ( idx = 0; idx < count; idx++ ) {
          if ( (err = switch_read( handle, idx, &pcm_switch )) < 0 ) {
            printf( "PCM %s switch read error: %s\n", str, snd_strerror( count ) );
            continue;
          }
          printf( "PCM switch: '%s' %s (%i-%i)\n", pcm_switch.name, get_type( pcm_switch.type ), pcm_switch.low, pcm_switch.high );
          if ( (err = switch_write( handle, idx, &pcm_switch )) < 0 ) {
            printf( "PCM %s switch write error: %s\n", str, snd_strerror( count ) );
            continue;
          }
        }
        if ( count <= 0 )
          printf( "No PCM %s switches detected for soundcard #%i/#%i '%s'/'%s'...\n", str, idx, device, info.name, pcm_info.name );
        snd_pcm_close( handle );
      }
    }
    snd_ctl_close( chandle );
  }  

  /* rawmidi switches */
  for ( card = 0; card < cards; card++ ) {
    if ( (err = snd_ctl_open( &chandle, card )) < 0 ) {
      printf( "CTL open error: %s\n", snd_strerror( err ) );
      continue;
    }
    if ( (err = snd_ctl_hw_info( chandle, &info )) < 0 ) {
      printf( "CTL hw info error: %s\n", snd_strerror( err ) );
      continue;
    }
    for ( device = 0; device < info.mididevs; device++ ) {
      if ( (err = snd_ctl_rawmidi_info( chandle, device, &rmidi_info )) < 0 ) {
        printf( "CTL RawMIDI info error: %s\n", snd_strerror( err ) );
        continue;
      }
      for ( direction = 0; direction < 2; direction++ ) {
        int (*switches)( void *handle );
        int (*switch_read)( void *handle, int switchn, snd_rawmidi_switch_t *data );
        int (*switch_write)( void *handle, int switchn, snd_rawmidi_switch_t *data );
        char *str;

        if ( !(pcm_info.flags & (!direction ? SND_RAWMIDI_INFO_OUTPUT : SND_RAWMIDI_INFO_INPUT)) ) continue;
        if ( (err = snd_rawmidi_open( &handle, card, device, !direction ? SND_RAWMIDI_OPEN_OUTPUT : SND_RAWMIDI_OPEN_INPUT )) < 0 ) {
          printf( "RawMIDI CTL open error: %s\n", snd_strerror( err ) );
          continue;
        }
        if ( !direction ) {
          switches = snd_rawmidi_output_switches;
          switch_read = snd_rawmidi_output_switch_read;
          switch_write = snd_rawmidi_output_switch_write;
          str = "output";
        } else {
          switches = snd_rawmidi_input_switches;
          switch_read = snd_rawmidi_input_switch_read;
          switch_write = snd_rawmidi_input_switch_write;
          str = "input";
        }
        if ( (count = switches( handle )) < 0 ) {
          printf( "RawMIDI %s switches error: %s\n", str, snd_strerror( count ) );
          continue;
        }
        for ( idx = 0; idx < count; idx++ ) {
          if ( (err = switch_read( handle, idx, &rmidi_switch )) < 0 ) {
            printf( "RawMIDI %s switch read error: %s\n", str, snd_strerror( count ) );
            continue;
          }
          printf( "RawMIDI switch: '%s' %s (%i-%i)\n", rmidi_switch.name, get_type( rmidi_switch.type ), rmidi_switch.low, rmidi_switch.high );
          if ( (err = switch_write( handle, idx, &rmidi_switch )) < 0 ) {
            printf( "RawMIDI %s switch write error: %s\n", str, snd_strerror( count ) );
            continue;
          }
        }
        if ( count <= 0 )
          printf( "No RawMIDI %s switches detected for soundcard #%i/#%i '%s'/'%s'...\n", str, idx, device, info.name, rmidi_info.name );
        snd_rawmidi_close( handle );
      }
    }
    snd_ctl_close( chandle );
  }  

}