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/*
* sndio output driver. This file is part of Shairport.
* Copyright (c) 2013 Dimitri Sokolyuk <demon@dim13.org>
*
* Modifications for audio synchronisation
* and related work, copyright (c) Mike Brady 2014
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <stdio.h>
#include <unistd.h>
#include <sndio.h>
#include "audio.h"
static struct sio_hdl *sio;
static struct sio_par par;
static int init(int argc, char **argv) {
sio = sio_open(SIO_DEVANY, SIO_PLAY, 0);
if (!sio)
die("sndio: cannot connect to sound server");
sio_initpar(&par);
par.bits = 16;
par.rate = 44100;
par.pchan = 2;
par.le = SIO_LE_NATIVE;
par.sig = 1;
if (!sio_setpar(sio, &par))
die("sndio: failed to set audio parameters");
if (!sio_getpar(sio, &par))
die("sndio: failed to get audio parameters");
config.audio_backend_buffer_desired_length = 44100; // one second.
config.audio_backend_latency_offset = 0;
return 0;
}
static void deinit(void) { sio_close(sio); }
static void start(int sample_rate) {
if (sample_rate != par.rate)
die("unexpected sample rate!");
sio_start(sio);
}
static void play(short buf[], int samples) {
sio_write(sio, (char *)buf, samples * par.bps * par.pchan);
}
static void stop(void) { sio_stop(sio); }
static void help(void) {
printf(" There are no options for sndio audio.\n");
printf(" Use AUDIODEVICE environment variable.\n");
}
static void volume(double vol) {
unsigned int v = vol * SIO_MAXVOL;
sio_setvol(sio, v);
}
audio_output audio_sndio = {.name = "sndio",
.help = &help,
.init = &init,
.deinit = &deinit,
.start = &start,
.stop = &stop,
.flush = NULL,
.delay = NULL,
.play = &play,
.volume = &volume,
.parameters = NULL,
.mute= NULL};
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