mirror of
https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git
synced 2025-11-04 13:29:59 -05:00
49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
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#include <assert.h>
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#include <sys/soundcard.h>
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#include <sys/ioctl.h>
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include "oss.h"
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int oss_auto_format(int fd, struct sample_spec *ss) {
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int format, channels, speed;
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assert(fd >= 0 && ss);
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format = AFMT_S16_NE;
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if (ioctl(fd, SNDCTL_DSP_SETFMT, &format) < 0 || format != AFMT_S16_NE) {
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int f = AFMT_S16_NE == AFMT_S16_LE ? AFMT_S16_BE : AFMT_S16_LE;
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format = f;
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if (ioctl(fd, SNDCTL_DSP_SETFMT, &format) < 0 || format != f) {
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format = AFMT_U8;
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if (ioctl(fd, SNDCTL_DSP_SETFMT, &format) < 0 || format != AFMT_U8) {
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fprintf(stderr, "SNDCTL_DSP_SETFMT: %s\n", format != AFMT_U8 ? "No supported sample format" : strerror(errno));
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return -1;
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} else
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ss->format = SAMPLE_U8;
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} else
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ss->format = f == AFMT_S16_LE ? SAMPLE_S16LE : SAMPLE_S16BE;
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} else
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ss->format = SAMPLE_S16NE;
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channels = 2;
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if (ioctl(fd, SNDCTL_DSP_CHANNELS, &channels) < 0) {
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fprintf(stderr, "SNDCTL_DSP_CHANNELS: %s\n", strerror(errno));
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return -1;
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}
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assert(channels);
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ss->channels = channels;
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speed = 44100;
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if (ioctl(fd, SNDCTL_DSP_SPEED, &speed) < 0) {
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fprintf(stderr, "SNDCTL_DSP_SPEED: %s\n", strerror(errno));
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return -1;
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}
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assert(speed);
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ss->rate = speed;
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return 0;
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}
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