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mpv/audio/out/ao_sndio.c

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/*
* Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org>
* Copyright (c) 2013 Christian Neukirchen <chneukirchen@gmail.com>
* Copyright (c) 2020 Rozhuk Ivan <rozhuk.im@gmail.com>
* Copyright (c) 2021 Andrew Krasavin <noiseless-ak@yandex.ru>
*
* 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 <sys/types.h>
#include <poll.h>
#include <errno.h>
#include <sndio.h>
#include "options/m_option.h"
#include "common/msg.h"
#include "audio/format.h"
#include "ao.h"
#include "internal.h"
struct priv {
struct sio_hdl *hdl;
struct sio_par par;
int delay;
bool playing;
int vol;
int havevol;
struct pollfd *pfd;
};
static const struct mp_chmap sndio_layouts[] = {
{0}, /* empty */
{1, {MP_SPEAKER_ID_FL}}, /* mono */
MP_CHMAP2(FL, FR), /* stereo */
{0}, /* 2.1 */
MP_CHMAP4(FL, FR, BL, BR), /* 4.0 */
{0}, /* 5.0 */
MP_CHMAP6(FL, FR, BL, BR, FC, LFE), /* 5.1 */
{0}, /* 6.1 */
MP_CHMAP8(FL, FR, BL, BR, FC, LFE, SL, SR), /* 7.1 */
/* Above is the fixed channel assignment for sndio, since we need to
* fill all channels and cannot insert silence, not all layouts are
* supported.
* NOTE: MP_SPEAKER_ID_NA could be used to add padding channels. */
};
static void uninit(struct ao *ao);
/* Make libsndio call movecb(). */
static void process_events(struct ao *ao)
{
struct priv *p = ao->priv;
int n = sio_pollfd(p->hdl, p->pfd, POLLOUT);
while (poll(p->pfd, n, 0) < 0 && errno == EINTR);
sio_revents(p->hdl, p->pfd);
}
/* Call-back invoked to notify of the hardware position. */
static void movecb(void *addr, int delta)
{
struct ao *ao = addr;
struct priv *p = ao->priv;
p->delay -= delta;
}
/* Call-back invoked to notify about volume changes. */
static void volcb(void *addr, unsigned newvol)
{
struct ao *ao = addr;
struct priv *p = ao->priv;
p->vol = newvol;
}
static int init(struct ao *ao)
{
struct priv *p = ao->priv;
struct mp_chmap_sel sel = {0};
size_t i;
struct af_to_par {
int format, bits, sig;
};
static const struct af_to_par af_to_par[] = {
{AF_FORMAT_U8, 8, 0},
{AF_FORMAT_S16, 16, 1},
{AF_FORMAT_S32, 32, 1},
};
const struct af_to_par *ap;
const char *device = ((ao->device) ? ao->device : SIO_DEVANY);
/* Opening device. */
MP_VERBOSE(ao, "Using '%s' audio device.\n", device);
p->hdl = sio_open(device, SIO_PLAY, 0);
if (p->hdl == NULL) {
MP_ERR(ao, "Can't open audio device %s.\n", device);
goto err_out;
}
sio_initpar(&p->par);
/* Selecting sound format. */
ao->format = af_fmt_from_planar(ao->format);
p->par.bits = 16;
p->par.sig = 1;
p->par.le = SIO_LE_NATIVE;
for (i = 0; i < MP_ARRAY_SIZE(af_to_par); i++) {
ap = &af_to_par[i];
if (ap->format == ao->format) {
p->par.bits = ap->bits;
p->par.sig = ap->sig;
break;
}
}
p->par.rate = ao->samplerate;
/* Channels count. */
for (i = 0; i < MP_ARRAY_SIZE(sndio_layouts); i++) {
mp_chmap_sel_add_map(&sel, &sndio_layouts[i]);
}
if (!ao_chmap_sel_adjust(ao, &sel, &ao->channels))
goto err_out;
p->par.pchan = ao->channels.num;
p->par.appbufsz = p->par.rate * 250 / 1000; /* 250ms buffer */
p->par.round = p->par.rate * 10 / 1000; /* 10ms block size */
if (!sio_setpar(p->hdl, &p->par)) {
MP_ERR(ao, "couldn't set params\n");
goto err_out;
}
/* Get current sound params. */
if (!sio_getpar(p->hdl, &p->par)) {
MP_ERR(ao, "couldn't get params\n");
goto err_out;
}
if (p->par.bps > 1 && p->par.le != SIO_LE_NATIVE) {
MP_ERR(ao, "swapped endian output not supported\n");
goto err_out;
}
/* Update sound params. */
if (p->par.bits == 8 && p->par.bps == 1 && !p->par.sig) {
ao->format = AF_FORMAT_U8;
} else if (p->par.bits == 16 && p->par.bps == 2 && p->par.sig) {
ao->format = AF_FORMAT_S16;
} else if ((p->par.bits == 32 || p->par.msb) && p->par.bps == 4 && p->par.sig) {
ao->format = AF_FORMAT_S32;
} else {
MP_ERR(ao, "couldn't set format\n");
goto err_out;
}
p->havevol = sio_onvol(p->hdl, volcb, ao);
sio_onmove(p->hdl, movecb, ao);
p->pfd = talloc_array_ptrtype(p, p->pfd, sio_nfds(p->hdl));
if (!p->pfd)
goto err_out;
ao->device_buffer = p->par.bufsz;
MP_VERBOSE(ao, "bufsz = %i, appbufsz = %i, round = %i\n",
p->par.bufsz, p->par.appbufsz, p->par.round);
p->delay = 0;
p->playing = false;
if (!sio_start(p->hdl)) {
MP_ERR(ao, "start: sio_start() fail.\n");
goto err_out;
}
return 0;
err_out:
uninit(ao);
return -1;
}
static void uninit(struct ao *ao)
{
struct priv *p = ao->priv;
if (p->hdl) {
sio_close(p->hdl);
p->hdl = NULL;
}
p->pfd = NULL;
p->playing = false;
}
static int control(struct ao *ao, enum aocontrol cmd, void *arg)
{
struct priv *p = ao->priv;
float *vol = arg;
switch (cmd) {
case AOCONTROL_GET_VOLUME:
if (!p->havevol)
return CONTROL_FALSE;
*vol = p->vol * 100 / SIO_MAXVOL;
break;
case AOCONTROL_SET_VOLUME:
if (!p->havevol)
return CONTROL_FALSE;
sio_setvol(p->hdl, *vol * SIO_MAXVOL / 100);
break;
default:
return CONTROL_UNKNOWN;
}
return CONTROL_OK;
}
static void reset(struct ao *ao)
{
struct priv *p = ao->priv;
if (p->playing) {
p->playing = false;
#if HAVE_SNDIO_1_9
if (!sio_flush(p->hdl)) {
MP_ERR(ao, "reset: couldn't sio_flush()\n");
#else
if (!sio_stop(p->hdl)) {
MP_ERR(ao, "reset: couldn't sio_stop()\n");
#endif
}
p->delay = 0;
if (!sio_start(p->hdl)) {
MP_ERR(ao, "reset: sio_start() fail.\n");
}
}
}
static void start(struct ao *ao)
{
struct priv *p = ao->priv;
p->playing = true;
process_events(ao);
}
static bool audio_write(struct ao *ao, void **data, int samples)
{
struct priv *p = ao->priv;
const size_t size = (samples * ao->sstride);
size_t rc;
rc = sio_write(p->hdl, data[0], size);
if (rc != size) {
MP_WARN(ao, "audio_write: unexpected partial write: required: %zu, written: %zu.\n",
size, rc);
reset(ao);
p->playing = false;
return false;
}
p->delay += samples;
return true;
}
static void get_state(struct ao *ao, struct mp_pcm_state *state)
{
struct priv *p = ao->priv;
process_events(ao);
/* how many samples we can play without blocking */
state->free_samples = ao->device_buffer - p->delay;
state->free_samples = state->free_samples / p->par.round * p->par.round;
/* how many samples are already in the buffer to be played */
state->queued_samples = p->delay;
/* delay in seconds between first and last sample in buffer */
state->delay = p->delay / (double)p->par.rate;
/* report unexpected EOF / underrun */
if ((state->queued_samples && state->queued_samples &&
(state->queued_samples < state->free_samples) &&
p->playing) || sio_eof(p->hdl))
{
MP_VERBOSE(ao, "get_state: EOF/underrun detected.\n");
MP_VERBOSE(ao, "get_state: free: %d, queued: %d, delay: %lf\n", \
state->free_samples, state->queued_samples, state->delay);
p->playing = false;
state->playing = p->playing;
ao_wakeup_playthread(ao);
} else {
state->playing = p->playing;
}
}
const struct ao_driver audio_out_sndio = {
.name = "sndio",
.description = "sndio audio output",
.init = init,
.uninit = uninit,
.control = control,
.reset = reset,
.start = start,
.write = audio_write,
.get_state = get_state,
.priv_size = sizeof(struct priv),
};
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