simpleaudio: alsa back-end
This commit is contained in:
parent
f4aa9dd64a
commit
e01ccb1d71
|
@ -0,0 +1,148 @@
|
||||||
|
/*
|
||||||
|
* simpleaudio-alsa.c
|
||||||
|
*
|
||||||
|
* Copyright (C) 2012 Kamal Mostafa <kamal@whence.com>
|
||||||
|
*
|
||||||
|
* This program is free software: you can redistribute it and/or modify
|
||||||
|
* it under the terms of the GNU General Public License as published by
|
||||||
|
* the Free Software Foundation, either version 3 of the License, or
|
||||||
|
* (at your option) any later version.
|
||||||
|
*
|
||||||
|
* This program is distributed in the hope that it will be useful,
|
||||||
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||||
|
* GNU General Public License for more details.
|
||||||
|
*
|
||||||
|
* You should have received a copy of the GNU General Public License
|
||||||
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifdef HAVE_CONFIG_H
|
||||||
|
#include "config.h"
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#if USE_ALSA
|
||||||
|
|
||||||
|
#include <stdio.h>
|
||||||
|
#include <malloc.h>
|
||||||
|
#include <assert.h>
|
||||||
|
|
||||||
|
#include <alsa/asoundlib.h>
|
||||||
|
|
||||||
|
#include "simpleaudio.h"
|
||||||
|
#include "simpleaudio_internal.h"
|
||||||
|
|
||||||
|
|
||||||
|
/*
|
||||||
|
* ALSA backend for simpleaudio
|
||||||
|
*/
|
||||||
|
|
||||||
|
|
||||||
|
static ssize_t
|
||||||
|
sa_alsa_read( simpleaudio *sa, float *buf, size_t nframes )
|
||||||
|
{
|
||||||
|
ssize_t frames_read = 0;
|
||||||
|
snd_pcm_t *pcm = (snd_pcm_t *)sa->backend_handle;
|
||||||
|
while ( frames_read < nframes ) {
|
||||||
|
ssize_t r;
|
||||||
|
r = snd_pcm_readi(pcm, buf, nframes-frames_read);
|
||||||
|
if (r < 0) {
|
||||||
|
/* silently recover from e.g. overruns, and try once more */
|
||||||
|
snd_pcm_prepare(pcm);
|
||||||
|
r = snd_pcm_readi(pcm, buf, nframes-frames_read);
|
||||||
|
}
|
||||||
|
if (r < 0) {
|
||||||
|
fprintf(stderr, "snd_pcm_readi: %s\n", snd_strerror(r));
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
if (r == 0)
|
||||||
|
break;
|
||||||
|
frames_read += r;
|
||||||
|
}
|
||||||
|
return frames_read;
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
static ssize_t
|
||||||
|
sa_alsa_write( simpleaudio *sa, float *buf, size_t nframes )
|
||||||
|
{
|
||||||
|
ssize_t frames_written;
|
||||||
|
snd_pcm_t *pcm = (snd_pcm_t *)sa->backend_handle;
|
||||||
|
frames_written = snd_pcm_writei(pcm, buf, nframes);
|
||||||
|
if (frames_written < 0) {
|
||||||
|
/* silently recover from e.g. underruns, and try once more */
|
||||||
|
snd_pcm_recover(pcm, frames_written, 1 /*silent*/);
|
||||||
|
frames_written = snd_pcm_writei(pcm, buf, nframes);
|
||||||
|
}
|
||||||
|
if (frames_written < 0) {
|
||||||
|
fprintf(stderr, "E: %s\n", snd_strerror(frames_written));
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
return frames_written;
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
static void
|
||||||
|
sa_alsa_close( simpleaudio *sa )
|
||||||
|
{
|
||||||
|
snd_pcm_drain(sa->backend_handle);
|
||||||
|
snd_pcm_close(sa->backend_handle);
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
static const struct simpleaudio_backend simpleaudio_backend_alsa = {
|
||||||
|
sa_alsa_read,
|
||||||
|
sa_alsa_write,
|
||||||
|
sa_alsa_close,
|
||||||
|
};
|
||||||
|
|
||||||
|
simpleaudio *
|
||||||
|
simpleaudio_open_stream_alsa(
|
||||||
|
// unsigned int rate, unsigned int channels,
|
||||||
|
int sa_stream_direction,
|
||||||
|
char *app_name, char *stream_name )
|
||||||
|
{
|
||||||
|
unsigned int rate = 48000;
|
||||||
|
unsigned int channels = 1;
|
||||||
|
|
||||||
|
snd_pcm_t *pcm;
|
||||||
|
int error;
|
||||||
|
|
||||||
|
error = snd_pcm_open(&pcm,
|
||||||
|
"plughw:0,0",
|
||||||
|
sa_stream_direction == SA_STREAM_RECORD ? SND_PCM_STREAM_CAPTURE : SND_PCM_STREAM_PLAYBACK,
|
||||||
|
0 /*mode*/);
|
||||||
|
if (error) {
|
||||||
|
fprintf(stderr, "E: Cannot create ALSA stream: %s\n", snd_strerror(error));
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
|
|
||||||
|
error = snd_pcm_set_params(pcm,
|
||||||
|
SND_PCM_FORMAT_FLOAT,
|
||||||
|
SND_PCM_ACCESS_RW_INTERLEAVED,
|
||||||
|
channels,
|
||||||
|
rate,
|
||||||
|
1 /* soft_resample (allow) */,
|
||||||
|
0 /* latency */);
|
||||||
|
if (error) {
|
||||||
|
fprintf(stderr, "E: %s\n", snd_strerror(error));
|
||||||
|
snd_pcm_close(pcm);
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
|
|
||||||
|
simpleaudio *sa = malloc(sizeof(simpleaudio));
|
||||||
|
if ( !sa ) {
|
||||||
|
perror("malloc");
|
||||||
|
snd_pcm_close(pcm);
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
|
sa->rate = rate;
|
||||||
|
sa->channels = channels;
|
||||||
|
sa->backend = &simpleaudio_backend_alsa;
|
||||||
|
sa->backend_handle = pcm;
|
||||||
|
sa->backend_framesize = sizeof(float);
|
||||||
|
|
||||||
|
return sa;
|
||||||
|
}
|
||||||
|
|
||||||
|
#endif /* USE_PULSEAUDIO */
|
|
@ -42,6 +42,12 @@ simpleaudio_open_stream_pulseaudio(
|
||||||
int sa_stream_direction,
|
int sa_stream_direction,
|
||||||
char *app_name, char *stream_name );
|
char *app_name, char *stream_name );
|
||||||
|
|
||||||
|
simpleaudio *
|
||||||
|
simpleaudio_open_stream_alsa(
|
||||||
|
// unsigned int rate, unsigned int channels,
|
||||||
|
int sa_stream_direction,
|
||||||
|
char *app_name, char *stream_name );
|
||||||
|
|
||||||
simpleaudio *
|
simpleaudio *
|
||||||
simpleaudio_open_stream_sndfile(
|
simpleaudio_open_stream_sndfile(
|
||||||
int sa_stream_direction,
|
int sa_stream_direction,
|
||||||
|
|
Loading…
Reference in New Issue