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PCM loopback API improved and added back the functionality.

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Some mmap() changes for the OSS emulation.
This commit is contained in:
Jaroslav Kysela 1999-11-30 09:25:59 +00:00
parent 3239ca9940
commit f5e461caa3
4 changed files with 182 additions and 34 deletions
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61
test/loopback.c
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@ -3,16 +3,75 @@
#include <string.h>
#include "../include/asoundlib.h"
#define CARD 0
#define DEVICE 0
#define SUBDEV 0
#define MODE SND_PCM_LB_STREAM_MODE_PACKET
static void show_format1(const char *prefix, snd_pcm_format_t *format)
{
printf("%sinterleave = %i, rate = %i, voices = %i, format = %i\n",
prefix,
format->interleave ? 1 : 0,
format->rate,
format->voices,
format->format);
}
static void show_format(snd_pcm_loopback_t *handle)
{
snd_pcm_format_t format;
int err;
err = snd_pcm_loopback_format(handle, &format);
if (err < 0) {
fprintf(stderr, "format failed: %s\n", snd_strerror(err));
exit(0);
}
show_format1("Format: ", &format);
}
static void data(void *private_data, char *buf, size_t count)
{
printf("DATA> count = %li\n", (long)count);
}
static void format_change(void *private_data, snd_pcm_format_t *format)
{
show_format1("Format change> ", format);
}
static void position_change(void *private_data, unsigned int pos)
{
printf("Position change> %u\n", pos);
}
int main(int argc, char *argv[])
{
int err;
ssize_t res;
snd_pcm_loopback_t *handle;
snd_pcm_loopback_callbacks_t callbacks;
err = snd_pcm_loopback_open(&handle, 0, 0, SND_PCM_LB_OPEN_PLAYBACK);
err = snd_pcm_loopback_open(&handle, CARD, DEVICE, SUBDEV, SND_PCM_LB_OPEN_PLAYBACK);
if (err < 0) {
fprintf(stderr, "open error: %s\n", snd_strerror(err));
exit(0);
}
err = snd_pcm_loopback_stream_mode(handle, MODE);
if (err < 0) {
fprintf(stderr, "stream mode setup failed: %s\n", snd_strerror(err));
exit(0);
}
show_format(handle);
memset(&callbacks, 0, sizeof(callbacks));
callbacks.data = data;
callbacks.format_change = format_change;
callbacks.position_change = position_change;
while ((res = snd_pcm_loopback_read(handle, &callbacks)) >= 0) {
if (res > 0)
printf("Read ok.. - %i\n", res);
}
snd_pcm_loopback_close(handle);
return 0;
}