code.delx.au - pulseaudio/blob - src/oss-util.c

   1 #include <assert.h>
   2 #include <sys/soundcard.h>
   3 #include <sys/ioctl.h>
   4 #include <stdio.h>
   5 #include <errno.h>
   6 #include <string.h>
   7
   8 #include "oss-util.h"
   9
  10 int oss_auto_format(int fd, struct pa_sample_spec *ss) {
  11     int format, channels, speed;
  12
  13     assert(fd >= 0 && ss);
  14
  15     format = AFMT_S16_NE;
  16     if (ioctl(fd, SNDCTL_DSP_SETFMT, &format) < 0 || format != AFMT_S16_NE) {
  17         int f = AFMT_S16_NE == AFMT_S16_LE ? AFMT_S16_BE : AFMT_S16_LE;
  18         format = f;
  19         if (ioctl(fd, SNDCTL_DSP_SETFMT, &format) < 0 || format != f) {
  20             format = AFMT_U8;
  21             if (ioctl(fd, SNDCTL_DSP_SETFMT, &format) < 0 || format != AFMT_U8) {
  22                 fprintf(stderr, "SNDCTL_DSP_SETFMT: %s\n", format != AFMT_U8 ? "No supported sample format" : strerror(errno));
  23                 return -1;
  24             } else
  25                 ss->format = PA_SAMPLE_U8;
  26         } else
  27             ss->format = f == AFMT_S16_LE ? PA_SAMPLE_S16LE : PA_SAMPLE_S16BE;
  28     } else
  29         ss->format = PA_SAMPLE_S16NE;
  30
  31     channels = 2;
  32     if (ioctl(fd, SNDCTL_DSP_CHANNELS, &channels) < 0) {
  33         fprintf(stderr, "SNDCTL_DSP_CHANNELS: %s\n", strerror(errno));
  34         return -1;
  35     }
  36     assert(channels);
  37     ss->channels = channels;
  38
  39     speed = 44100;
  40     if (ioctl(fd, SNDCTL_DSP_SPEED, &speed) < 0) {
  41         fprintf(stderr, "SNDCTL_DSP_SPEED: %s\n", strerror(errno));
  42         return -1;
  43     }
  44     assert(speed);
  45     ss->rate = speed;
  46
  47     return 0;
  48 }