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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>
*
* 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 "config.h"
#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;
int vol;
int havevol;
#define SILENCE_NMAX 0x1000
char silence[SILENCE_NMAX];
struct pollfd *pfd;
char *dev;
};
/*
* misc parameters (volume, etc...)
*/
static int control(struct ao *ao, enum aocontrol cmd, void *arg)
{
struct priv *p = ao->priv;
ao_control_vol_t *vol = arg;
switch (cmd) {
case AOCONTROL_GET_VOLUME:
if (!p->havevol)
return CONTROL_FALSE;
vol->left = vol->right = p->vol * 100 / SIO_MAXVOL;
break;
case AOCONTROL_SET_VOLUME:
if (!p->havevol)
return CONTROL_FALSE;
sio_setvol(p->hdl, vol->left * SIO_MAXVOL / 100);
break;
case AOCONTROL_HAS_SOFT_VOLUME:
return CONTROL_TRUE;
default:
return CONTROL_UNKNOWN;
}
return CONTROL_OK;
}
/*
* call-back invoked to notify of the hardware position
*/
static void movecb(void *addr, int delta)
{
struct priv *p = addr;
p->delay -= delta * (int)(p->par.bps * p->par.pchan);
}
/*
* call-back invoked to notify about volume changes
*/
static void volcb(void *addr, unsigned newvol)
{
struct priv *p = addr;
p->vol = newvol;
}
static const struct mp_chmap sndio_layouts[MP_NUM_CHANNELS + 1] = {
{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. */
};
/*
* open device and setup parameters
* return: 0=success -1=fail
*/
static int init(struct ao *ao)
{
struct priv *p = ao->priv;
struct af_to_par {
int format, bits, sig;
} static const af_to_par[] = {
{AF_FORMAT_U8, 8, 0},
{AF_FORMAT_S8, 8, 1},
{AF_FORMAT_U16, 16, 0},
{AF_FORMAT_S16, 16, 1},
{AF_FORMAT_U24, 16, 0},
{AF_FORMAT_S24, 24, 1},
{AF_FORMAT_U32, 32, 0},
{AF_FORMAT_S32, 32, 1},
}, *ap;
int i;
p->hdl = sio_open(p->dev, SIO_PLAY, 0);
if (p->hdl == NULL) {
MP_ERR(ao, "can't open sndio %s\n", p->dev);
goto error;
}
ao->format = af_fmt_from_planar(ao->format);
sio_initpar(&p->par);
for (i = 0, ap = af_to_par;; i++, ap++) {
if (i == sizeof(af_to_par) / sizeof(struct af_to_par)) {
MP_VERBOSE(ao, "unsupported format\n");
p->par.bits = 16;
p->par.sig = 1;
p->par.le = SIO_LE_NATIVE;
break;
}
if (ap->format == ao->format) {
p->par.bits = ap->bits;
p->par.sig = ap->sig;
if (ap->bits > 8)
p->par.le = SIO_LE_NATIVE;
if (ap->bits != SIO_BPS(ap->bits))
p->par.bps = ap->bits / 8;
break;
}
}
p->par.rate = ao->samplerate;
struct mp_chmap_sel sel = {0};
for (int n = 0; n < MP_NUM_CHANNELS+1; n++)
mp_chmap_sel_add_map(&sel, &sndio_layouts[n]);
if (!ao_chmap_sel_adjust(ao, &sel, &ao->channels))
goto error;
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 error;
}
if (!sio_getpar(p->hdl, &p->par)) {
MP_ERR(ao, "couldn't get params\n");
goto error;
}
if (p->par.bps > 1 && p->par.le != SIO_LE_NATIVE) {
MP_ERR(ao, "swapped endian output not supported\n");
goto error;
}
if (p->par.bits == 8 && p->par.bps == 1) {
ao->format = p->par.sig ? AF_FORMAT_S8 : AF_FORMAT_U8;
} else if (p->par.bits == 16 && p->par.bps == 2) {
ao->format = p->par.sig ? AF_FORMAT_S16 : AF_FORMAT_U16;
} else if ((p->par.bits == 24 || p->par.msb) && p->par.bps == 3) {
ao->format = p->par.sig ? AF_FORMAT_S24 : AF_FORMAT_U24;
} else if ((p->par.bits == 32 || p->par.msb) && p->par.bps == 4) {
ao->format = p->par.sig ? AF_FORMAT_S32 : AF_FORMAT_U32;
} else {
MP_ERR(ao, "couldn't set format\n");
goto error;
}
ao->bps = p->par.bps * p->par.pchan * p->par.rate;
p->havevol = sio_onvol(p->hdl, volcb, p);
sio_onmove(p->hdl, movecb, p);
p->delay = 0;
if (!sio_start(p->hdl))
MP_ERR(ao, "init: couldn't start\n");
p->pfd = calloc (sio_nfds(p->hdl), sizeof (struct pollfd));
if (!p->pfd)
goto error;
return 0;
error:
if (p->hdl)
sio_close(p->hdl);
return -1;
}
/*
* close device
*/
static void uninit(struct ao *ao)
{
struct priv *p = ao->priv;
if (p->hdl)
sio_close(p->hdl);
free(p->pfd);
}
/*
* stop playing and empty buffers (for seeking/pause)
*/
static void reset(struct ao *ao)
{
struct priv *p = ao->priv;
if (!sio_stop(p->hdl))
MP_ERR(ao, "reset: couldn't stop\n");
p->delay = 0;
if (!sio_start(p->hdl))
MP_ERR(ao, "reset: couldn't start\n");
}
/*
* play given number of bytes until sio_write() blocks
*/
static int play(struct ao *ao, void **data, int samples, int flags)
{
struct priv *p = ao->priv;
int n;
n = sio_write(p->hdl, data[0], samples * ao->sstride);
p->delay += n;
if (flags & AOPLAY_FINAL_CHUNK)
reset(ao);
return n / ao->sstride;
}
/*
* how many bytes can be played without blocking
*/
static int get_space(struct ao *ao)
{
struct priv *p = ao->priv;
int n;
/*
* call poll() and sio_revents(), so the
* delay counter is updated
*/
n = sio_pollfd(p->hdl, p->pfd, POLLOUT);
while (poll(p->pfd, n, 0) < 0 && errno == EINTR)
; /* nothing */
sio_revents(p->hdl, p->pfd);
int samples = (p->par.bufsz * p->par.pchan * p->par.bps - p->delay) / ao->sstride;
return samples / p->par.round * p->par.round;
}
/*
* return: delay in seconds between first and last sample in buffer
*/
static float get_delay(struct ao *ao)
{
struct priv *p = ao->priv;
return (float)p->delay / (p->par.bps * p->par.pchan * p->par.rate);
}
/*
* stop playing, keep buffers (for pause)
*/
static void audio_pause(struct ao *ao)
{
reset(ao);
}
/*
* resume playing, after audio_pause()
*/
static void audio_resume(struct ao *ao)
{
struct priv *p = ao->priv;
int n, count, todo;
/*
* we want to start with buffers full, because mpv uses
* get_delay() as clock, which would cause video to
* accelerate while buffers are filled.
*/
todo = p->par.bufsz * p->par.pchan * p->par.bps;
while (todo > 0) {
count = todo;
if (count > SILENCE_NMAX)
count = SILENCE_NMAX;
n = sio_write(p->hdl, p->silence, count);
if (n == 0)
break;
todo -= n;
p->delay += n;
}
}
#define OPT_BASE_STRUCT struct priv
const struct ao_driver audio_out_sndio = {
.description = "sndio audio output",
.name = "sndio",
.init = init,
.uninit = uninit,
.control = control,
.get_space = get_space,
.play = play,
.get_delay = get_delay,
.pause = audio_pause,
.resume = audio_resume,
.reset = reset,
.priv_size = sizeof(struct priv),
.options = (const struct m_option[]) {
OPT_STRING("device", dev, 0, OPTDEF_STR(SIO_DEVANY)),
{0}
},
};
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