Revision 4c4dc3c77b9dc7e51eb365be3172909ede4df92a authored by Marty Rosenberg on 27 May 2014, 13:40:35 UTC, committed by Marty Rosenberg on 27 May 2014, 13:40:35 UTC
1 parent 70cc08d
cubeb_sndio.c
/*
* Copyright (c) 2011 Alexandre Ratchov <alex@caoua.org>
*
* This program is made available under an ISC-style license. See the
* accompanying file LICENSE for details.
*/
#include <poll.h>
#include <pthread.h>
#include <sndio.h>
#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
#include "cubeb/cubeb.h"
#include "cubeb-internal.h"
#if defined(CUBEB_SNDIO_DEBUG)
#define DPR(...) fprintf(stderr, __VA_ARGS__);
#else
#define DPR(...) do {} while(0)
#endif
static struct cubeb_ops const sndio_ops;
struct cubeb {
struct cubeb_ops const * ops;
};
struct cubeb_stream {
cubeb * context;
pthread_t th; /* to run real-time audio i/o */
pthread_mutex_t mtx; /* protects hdl and pos */
struct sio_hdl *hdl; /* link us to sndio */
int active; /* cubec_start() called */
int conv; /* need float->s16 conversion */
unsigned char *buf; /* data is prepared here */
unsigned int nfr; /* number of frames in buf */
unsigned int bpf; /* bytes per frame */
unsigned int pchan; /* number of play channels */
uint64_t rdpos; /* frame number Joe hears right now */
uint64_t wrpos; /* number of written frames */
cubeb_data_callback data_cb; /* cb to preapare data */
cubeb_state_callback state_cb; /* cb to notify about state changes */
void *arg; /* user arg to {data,state}_cb */
};
static void
float_to_s16(void *ptr, long nsamp)
{
int16_t *dst = ptr;
float *src = ptr;
while (nsamp-- > 0)
*(dst++) = *(src++) * 32767;
}
static void
sndio_onmove(void *arg, int delta)
{
cubeb_stream *s = (cubeb_stream *)arg;
s->rdpos += delta;
}
static void *
sndio_mainloop(void *arg)
{
#define MAXFDS 8
struct pollfd pfds[MAXFDS];
cubeb_stream *s = arg;
int n, nfds, revents, state;
size_t start = 0, end = 0;
long nfr;
DPR("sndio_mainloop()\n");
s->state_cb(s, s->arg, CUBEB_STATE_STARTED);
pthread_mutex_lock(&s->mtx);
if (!sio_start(s->hdl)) {
pthread_mutex_unlock(&s->mtx);
return NULL;
}
DPR("sndio_mainloop(), started\n");
start = end = s->nfr;
for (;;) {
if (!s->active) {
DPR("sndio_mainloop() stopped\n");
state = CUBEB_STATE_STOPPED;
break;
}
if (start == end) {
if (end < s->nfr) {
DPR("sndio_mainloop() drained\n");
state = CUBEB_STATE_DRAINED;
break;
}
pthread_mutex_unlock(&s->mtx);
nfr = s->data_cb(s, s->arg, s->buf, s->nfr);
pthread_mutex_lock(&s->mtx);
if (nfr < 0) {
DPR("sndio_mainloop() cb err\n");
state = CUBEB_STATE_ERROR;
break;
}
if (s->conv)
float_to_s16(s->buf, nfr * s->pchan);
start = 0;
end = nfr * s->bpf;
}
if (end == 0)
continue;
nfds = sio_pollfd(s->hdl, pfds, POLLOUT);
if (nfds > 0) {
pthread_mutex_unlock(&s->mtx);
n = poll(pfds, nfds, -1);
pthread_mutex_lock(&s->mtx);
if (n < 0)
continue;
}
revents = sio_revents(s->hdl, pfds);
if (revents & POLLHUP)
break;
if (revents & POLLOUT) {
n = sio_write(s->hdl, s->buf + start, end - start);
if (n == 0) {
DPR("sndio_mainloop() werr\n");
state = CUBEB_STATE_ERROR;
break;
}
s->wrpos = 0;
start += n;
}
}
sio_stop(s->hdl);
s->rdpos = s->wrpos;
pthread_mutex_unlock(&s->mtx);
s->state_cb(s, s->arg, state);
return NULL;
}
/*static*/ int
sndio_init(cubeb **context, char const *context_name)
{
DPR("sndio_init(%s)\n", context_name);
*context = malloc(sizeof(*context));
(*context)->ops = &sndio_ops;
(void)context_name;
return CUBEB_OK;
}
static char const *
sndio_get_backend_id(cubeb *context)
{
return "sndio";
}
static void
sndio_destroy(cubeb *context)
{
DPR("sndio_destroy()\n");
free(context);
}
static int
sndio_stream_init(cubeb *context,
cubeb_stream **stream,
char const *stream_name,
cubeb_stream_params stream_params, unsigned int latency,
cubeb_data_callback data_callback,
cubeb_state_callback state_callback,
void *user_ptr)
{
cubeb_stream *s;
struct sio_par wpar, rpar;
DPR("sndio_stream_init(%s)\n", stream_name);
size_t size;
s = malloc(sizeof(cubeb_stream));
if (s == NULL)
return CUBEB_ERROR;
s->context = context;
s->hdl = sio_open(NULL, SIO_PLAY, 0);
if (s->hdl == NULL) {
free(s);
DPR("sndio_stream_init(), sio_open() failed\n");
return CUBEB_ERROR;
}
sio_initpar(&wpar);
wpar.sig = 1;
wpar.bits = 16;
switch (stream_params.format) {
case CUBEB_SAMPLE_S16LE:
wpar.le = 1;
break;
case CUBEB_SAMPLE_S16BE:
wpar.le = 0;
break;
case CUBEB_SAMPLE_FLOAT32NE:
wpar.le = SIO_LE_NATIVE;
break;
default:
DPR("sndio_stream_init() unsupported format\n");
return CUBEB_ERROR_INVALID_FORMAT;
}
wpar.rate = stream_params.rate;
wpar.pchan = stream_params.channels;
wpar.appbufsz = latency * wpar.rate / 1000;
if (!sio_setpar(s->hdl, &wpar) || !sio_getpar(s->hdl, &rpar)) {
sio_close(s->hdl);
free(s);
DPR("sndio_stream_init(), sio_setpar() failed\n");
return CUBEB_ERROR;
}
if (rpar.bits != wpar.bits || rpar.le != wpar.le ||
rpar.sig != wpar.sig || rpar.rate != wpar.rate ||
rpar.pchan != wpar.pchan) {
sio_close(s->hdl);
free(s);
DPR("sndio_stream_init() unsupported params\n");
return CUBEB_ERROR_INVALID_FORMAT;
}
sio_onmove(s->hdl, sndio_onmove, s);
s->active = 0;
s->nfr = rpar.round;
s->bpf = rpar.bps * rpar.pchan;
s->pchan = rpar.pchan;
s->data_cb = data_callback;
s->state_cb = state_callback;
s->arg = user_ptr;
s->mtx = PTHREAD_MUTEX_INITIALIZER;
s->rdpos = s->wrpos = 0;
if (stream_params.format == CUBEB_SAMPLE_FLOAT32LE) {
s->conv = 1;
size = rpar.round * rpar.pchan * sizeof(float);
} else {
s->conv = 0;
size = rpar.round * rpar.pchan * rpar.bps;
}
s->buf = malloc(size);
if (s->buf == NULL) {
sio_close(s->hdl);
free(s);
return CUBEB_ERROR;
}
*stream = s;
DPR("sndio_stream_init() end, ok\n");
(void)context;
(void)stream_name;
return CUBEB_OK;
}
static int
sndio_get_max_channel_count(cubeb * ctx, uint32_t * max_channels)
{
assert(ctx && max_channels);
*max_channels = 8;
return CUBEB_OK;
}
static int
sndio_get_preferred_sample_rate(cubeb * ctx, uint32_t * rate)
{
// XXX Not yet implemented.
*rate = 44100;
return CUBEB_OK;
}
static int
sndio_get_min_latency(cubeb * ctx, cubeb_stream_params params, uint32_t * latency_ms)
{
// XXX Not yet implemented.
latency_ms = 40;
return CUBEB_OK;
}
static void
sndio_stream_destroy(cubeb_stream *s)
{
DPR("sndio_stream_destroy()\n");
sio_close(s->hdl);
free(s);
}
static int
sndio_stream_start(cubeb_stream *s)
{
int err;
DPR("sndio_stream_start()\n");
s->active = 1;
err = pthread_create(&s->th, NULL, sndio_mainloop, s);
if (err) {
s->active = 0;
return CUBEB_ERROR;
}
return CUBEB_OK;
}
static int
sndio_stream_stop(cubeb_stream *s)
{
void *dummy;
DPR("sndio_stream_stop()\n");
if (s->active) {
s->active = 0;
pthread_join(s->th, &dummy);
}
return CUBEB_OK;
}
static int
sndio_stream_get_position(cubeb_stream *s, uint64_t *p)
{
pthread_mutex_lock(&s->mtx);
DPR("sndio_stream_get_position() %lld\n", s->rdpos);
*p = s->rdpos;
pthread_mutex_unlock(&s->mtx);
return CUBEB_OK;
}
static int
sndio_stream_set_volume(cubeb_stream *s, float volume)
{
DPR("sndio_stream_set_volume(%f)\n", volume);
pthread_mutex_lock(&s->mtx);
sio_setvol(s->hdl, SIO_MAXVOL * volume);
pthread_mutex_unlock(&s->mtx);
return CUBEB_OK;
}
int
sndio_stream_get_latency(cubeb_stream * stm, uint32_t * latency)
{
// http://www.openbsd.org/cgi-bin/man.cgi?query=sio_open
// in the "Measuring the latency and buffers usage" paragraph.
*latency = stm->wrpos - stm->rdpos;
return CUBEB_OK;
}
static struct cubeb_ops const sndio_ops = {
.init = sndio_init,
.get_backend_id = sndio_get_backend_id,
.get_max_channel_count = sndio_get_max_channel_count,
.get_min_latency = sndio_get_min_latency,
.get_preferred_sample_rate = sndio_get_preferred_sample_rate,
.destroy = sndio_destroy,
.stream_init = sndio_stream_init,
.stream_destroy = sndio_stream_destroy,
.stream_start = sndio_stream_start,
.stream_stop = sndio_stream_stop,
.stream_get_position = sndio_stream_get_position,
.stream_get_latency = sndio_stream_get_latency
};
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