seq_info.c

在linux下多媒体开发实例linux下多媒体开发

/*
 * seq_info.c
 * Example program for /dev/sequencer.
 */

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/ioctl.h>

#include <sys/soundcard.h>

/* return string given a MIDI device type */
char *midi_device_type(int type)
{
  switch (type) {
  case SNDCARD_ADLIB:      return("Adlib");
  case SNDCARD_SB:         return("SoundBlaster");
  case SNDCARD_PAS:        return("ProAudioSpectrum");
  case SNDCARD_GUS:        return("GravisUltraSound");
  case SNDCARD_MPU401:     return("MPU401");
  case SNDCARD_SB16:       return("SoundBlaster16");
  case SNDCARD_SB16MIDI:   return("SoundBlaster16 MIDI");
  case SNDCARD_UART6850:   return("6850 UART");
  case SNDCARD_GUS16:      return("Gravis UltraSound 16");
  case SNDCARD_MSS:        return("Microsoft Sound System");
  case SNDCARD_PSS:        return("Personal Sound System");
  case SNDCARD_SSCAPE:     return("Ensoniq SoundScape");
/* these require a more recent version of the sound driver */
#if SOUND_VERSION >= 301
  case SNDCARD_PSS_MPU:    return("Personal Sound System + MPU");
  case SNDCARD_PSS_MSS:    return("Personal Sound System/Microsoft Sound System");
  case SNDCARD_TRXPRO_MPU: return("MediaTrix Pro + MPU");
  case SNDCARD_MAD16:       return("MAD16");
  case SNDCARD_MAD16_MPU:  return("MAD16 + MPU");
  case SNDCARD_CS4232:     return("CS4232");
  case SNDCARD_CS4232_MPU: return("CS4232 + MPU");
  case SNDCARD_MAUI:       return("Maui");
  case SNDCARD_PSEUDO_MSS: return("Pseudo-MSS");
#endif /* SOUND_VERSION >= 301 */
#if SOUND_VERSION >= 350
  case SNDCARD_GUSPNP:     return ("Gravis UltraSound PlugNPlay");
#endif /* SOUND_VERSION >= 301 */
  default:                 return("unknown");
  }
}

/* return string given a synthesizer device type */
char *synth_device_type(int type)
{
  switch (type) {
  case SYNTH_TYPE_FM:     return("FM");
  case SYNTH_TYPE_SAMPLE: return("Sampling");
  case SYNTH_TYPE_MIDI:   return("MIDI");
  default:                return("unknown");
  }
}

/* return string given a synthesizer device subtype */
char *synth_device_subtype(int type)
{
  switch (type) {
  case FM_TYPE_ADLIB:   return("Adlib");
  case FM_TYPE_OPL3:    return("OPL-3");
  case SAMPLE_TYPE_GUS: return("GUS");
  default:              return("unknown");
  }
}

int main(int argc, char *argv[])
{
  int i, status, numdevs;
  struct synth_info sinfo;
  struct midi_info minfo;
  int fd;        /* file descriptor for /dev/sequencer */
  char *device; /* name of device to report on */

  /* get device name from command line or use default */  
  if (argc == 2)
    device = argv[1];
  else
    device = "/dev/sequencer";

  /* try to open device */
  fd = open(device, O_WRONLY);
  if (fd == -1) {
    fprintf(stderr, "%s: unable to open `%s', ", argv[0], device);
    perror("");
    return 1;
  }

  status = ioctl(fd, SNDCTL_SEQ_NRSYNTHS, &numdevs);
  if (status == -1) {
    perror("ioctl failed");
    exit(1);
  }
  printf("%s:\n%d synthesizer device%s installed\n", device, numdevs,
	 numdevs == 1 ? "" : "s");

  for (i = 0 ; i < numdevs ; i++) {
    sinfo.device = i;
    status = ioctl(fd, SNDCTL_SYNTH_INFO, &sinfo);
    if (status == -1) {
      perror("ioctl failed");
      exit(1);
    }
    printf("Device %d: `%s' type: `%s' subtype: `%s' voices: %d\n",
	   i,
	   sinfo.name,
	   synth_device_type(sinfo.synth_type),
	   synth_device_subtype(sinfo.synth_subtype),
	   sinfo.nr_voices);
  }
  status = ioctl(fd, SNDCTL_SEQ_NRMIDIS, &numdevs);
  if (status == -1) {
    perror("ioctl failed");
    exit(1);
  }
  printf("%d MIDI device%s installed\n", numdevs,
	 numdevs == 1 ? "" : "s");
  for (i = 0 ; i < numdevs ; i++) {
    minfo.device = i;
    status = ioctl(fd, SNDCTL_MIDI_INFO, &minfo);
    if (status == -1) {
      perror("ioctl failed");
      exit(1);
    }
    printf("Device %d: `%s' type: `%s'\n",
	   i,
	   minfo.name,
	   midi_device_type(minfo.dev_type));
  }
  /* close file and exit */
  close(fd);
  return 0;
}