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mpv/audio/out/ao_oss.c

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/*
* OSS audio output driver
*
* Original author: A'rpi
* Support for >2 output channels added 2001-11-25
* - Steve Davies <steve@daviesfam.org>
*
* This file is part of mpv.
*
* mpv 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 2 of the License, or
* (at your option) any later version.
*
* mpv 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 mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <poll.h>
#include <errno.h>
#include <string.h>
#include <strings.h>
#include "config.h"
#include "options/options.h"
#include "common/common.h"
#include "common/msg.h"
#include "osdep/timer.h"
#include "osdep/endian.h"
#include <sys/soundcard.h>
#include "audio/format.h"
#include "ao.h"
#include "internal.h"
#if !HAVE_GPL
#error GPL only
#endif
// Define to 0 if the device must be reopened to reset it (stop all playback,
// clear the buffer), and the device should be closed when unused.
// Define to 1 if SNDCTL_DSP_RESET should be used to reset without close.
#if defined(SNDCTL_DSP_RESET) && !defined(__NetBSD__)
#define KEEP_DEVICE 1
#else
#define KEEP_DEVICE 0
#endif
#define PATH_DEV_DSP "/dev/dsp"
#define PATH_DEV_MIXER "/dev/mixer"
struct priv {
int audio_fd;
int prepause_samples;
int oss_mixer_channel;
int audio_delay_method;
int buffersize;
int outburst;
bool device_failed;
double audio_end;
char *oss_mixer_device;
char *cfg_oss_mixer_channel;
};
static const char *const mixer_channels[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_NAMES;
/* like alsa except for 6.1 and 7.1, from pcm/matrix_map.h */
static const struct mp_chmap oss_layouts[MP_NUM_CHANNELS + 1] = {
{0}, // empty
MP_CHMAP_INIT_MONO, // mono
MP_CHMAP2(FL, FR), // stereo
MP_CHMAP3(FL, FR, LFE), // 2.1
MP_CHMAP4(FL, FR, BL, BR), // 4.0
MP_CHMAP5(FL, FR, BL, BR, FC), // 5.0
MP_CHMAP6(FL, FR, BL, BR, FC, LFE), // 5.1
MP_CHMAP7(FL, FR, BL, BR, FC, LFE, BC), // 6.1
MP_CHMAP8(FL, FR, BL, BR, FC, LFE, SL, SR), // 7.1
};
#if !defined(AFMT_S16_NE) && defined(AFMT_S16_LE) && defined(AFMT_S16_BE)
#define AFMT_S16_NE MP_SELECT_LE_BE(AFMT_S16_LE, AFMT_S16_BE)
#endif
#if !defined(AFMT_S32_NE) && defined(AFMT_S32_LE) && defined(AFMT_S32_BE)
#define AFMT_S32_NE AFMT_S32MP_SELECT_LE_BE(AFMT_S32_LE, AFMT_S32_BE)
#endif
static const int format_table[][2] = {
{AFMT_U8, AF_FORMAT_U8},
{AFMT_S16_NE, AF_FORMAT_S16},
#ifdef AFMT_S32_NE
{AFMT_S32_NE, AF_FORMAT_S32},
#endif
#ifdef AFMT_FLOAT
{AFMT_FLOAT, AF_FORMAT_FLOAT},
#endif
#ifdef AFMT_MPEG
{AFMT_MPEG, AF_FORMAT_S_MP3},
#endif
{-1, -1}
};
#ifndef AFMT_AC3
#define AFMT_AC3 -1
#endif
static int format2oss(int format)
{
for (int n = 0; format_table[n][0] != -1; n++) {
if (format_table[n][1] == format)
return format_table[n][0];
}
return -1;
}
static int oss2format(int format)
{
for (int n = 0; format_table[n][0] != -1; n++) {
if (format_table[n][0] == format)
return format_table[n][1];
}
return 0;
}
#ifdef SNDCTL_DSP_GETPLAYVOL
static int volume_oss4(struct ao *ao, ao_control_vol_t *vol, int cmd)
{
struct priv *p = ao->priv;
int v;
if (p->audio_fd < 0)
return CONTROL_ERROR;
if (cmd == AOCONTROL_GET_VOLUME) {
if (ioctl(p->audio_fd, SNDCTL_DSP_GETPLAYVOL, &v) == -1)
return CONTROL_ERROR;
vol->right = (v & 0xff00) >> 8;
vol->left = v & 0x00ff;
return CONTROL_OK;
} else if (cmd == AOCONTROL_SET_VOLUME) {
v = ((int) vol->right << 8) | (int) vol->left;
if (ioctl(p->audio_fd, SNDCTL_DSP_SETPLAYVOL, &v) == -1)
return CONTROL_ERROR;
return CONTROL_OK;
} else
return CONTROL_UNKNOWN;
}
#endif
// to set/get/query special features/parameters
static int control(struct ao *ao, enum aocontrol cmd, void *arg)
{
struct priv *p = ao->priv;
switch (cmd) {
case AOCONTROL_GET_VOLUME:
case AOCONTROL_SET_VOLUME: {
ao_control_vol_t *vol = (ao_control_vol_t *)arg;
int fd, v, devs;
#ifdef SNDCTL_DSP_GETPLAYVOL
// Try OSS4 first
if (volume_oss4(ao, vol, cmd) == CONTROL_OK)
return CONTROL_OK;
#endif
if (!af_fmt_is_pcm(ao->format))
return CONTROL_TRUE;
if ((fd = open(p->oss_mixer_device, O_RDONLY)) != -1) {
ioctl(fd, SOUND_MIXER_READ_DEVMASK, &devs);
if (devs & (1 << p->oss_mixer_channel)) {
if (cmd == AOCONTROL_GET_VOLUME) {
ioctl(fd, MIXER_READ(p->oss_mixer_channel), &v);
vol->right = (v & 0xFF00) >> 8;
vol->left = v & 0x00FF;
} else {
v = ((int)vol->right << 8) | (int)vol->left;
ioctl(fd, MIXER_WRITE(p->oss_mixer_channel), &v);
}
} else {
close(fd);
return CONTROL_ERROR;
}
close(fd);
return CONTROL_OK;
}
return CONTROL_ERROR;
}
}
return CONTROL_UNKNOWN;
}
// 1: ok, 0: not writable, -1: error
static int device_writable(struct ao *ao)
{
struct priv *p = ao->priv;
struct pollfd fd = {.fd = p->audio_fd, .events = POLLOUT};
return poll(&fd, 1, 0);
}
static void close_device(struct ao *ao)
{
struct priv *p = ao->priv;
p->device_failed = false;
if (p->audio_fd == -1)
return;
#if defined(SNDCTL_DSP_RESET)
ioctl(p->audio_fd, SNDCTL_DSP_RESET, NULL);
#endif
close(p->audio_fd);
p->audio_fd = -1;
}
// close audio device
static void uninit(struct ao *ao)
{
close_device(ao);
}
static bool try_format(struct ao *ao, int *format)
{
struct priv *p = ao->priv;
int oss_format = format2oss(*format);
if (oss_format == -1 && af_fmt_is_spdif(*format))
oss_format = AFMT_AC3;
if (oss_format == -1) {
MP_VERBOSE(ao, "Unknown/not supported internal format: %s\n",
af_fmt_to_str(*format));
*format = 0;
return false;
}
int actual_format = oss_format;
if (ioctl(p->audio_fd, SNDCTL_DSP_SETFMT, &actual_format) < 0)
actual_format = -1;
if (actual_format == oss_format)
return true;
MP_WARN(ao, "Can't set audio device to %s output.\n", af_fmt_to_str(*format));
*format = oss2format(actual_format);
if (actual_format != -1 && !*format)
MP_ERR(ao, "Unknown/Unsupported OSS format: 0x%x.\n", actual_format);
return false;
}
static int reopen_device(struct ao *ao, bool allow_format_changes)
{
struct priv *p = ao->priv;
int samplerate = ao->samplerate;
int format = ao->format;
struct mp_chmap channels = ao->channels;
const char *device = PATH_DEV_DSP;
if (ao->device)
device = ao->device;
MP_VERBOSE(ao, "using '%s' dsp device\n", device);
#ifdef __linux__
p->audio_fd = open(device, O_WRONLY | O_NONBLOCK);
#else
p->audio_fd = open(device, O_WRONLY);
#endif
if (p->audio_fd < 0) {
MP_ERR(ao, "Can't open audio device %s: %s\n",
device, mp_strerror(errno));
goto fail;
}
#ifdef __linux__
/* Remove the non-blocking flag */
if (fcntl(p->audio_fd, F_SETFL, 0) < 0) {
MP_ERR(ao, "Can't make file descriptor blocking: %s\n",
mp_strerror(errno));
goto fail;
}
#endif
#if defined(FD_CLOEXEC) && defined(F_SETFD)
fcntl(p->audio_fd, F_SETFD, FD_CLOEXEC);
#endif
if (af_fmt_is_spdif(format)) {
if (ioctl(p->audio_fd, SNDCTL_DSP_SPEED, &samplerate) == -1)
goto fail;
// Probably could be fixed by setting number of channels; needs testing.
if (channels.num != 2) {
MP_ERR(ao, "Format %s not implemented.\n", af_fmt_to_str(format));
goto fail;
}
}
int try_formats[AF_FORMAT_COUNT + 1];
af_get_best_sample_formats(format, try_formats);
for (int n = 0; try_formats[n]; n++) {
format = try_formats[n];
if (try_format(ao, &format))
break;
}
if (!format) {
MP_ERR(ao, "Can't set sample format.\n");
goto fail;
}
MP_VERBOSE(ao, "sample format: %s\n", af_fmt_to_str(format));
if (!af_fmt_is_spdif(format)) {
struct mp_chmap_sel sel = {0};
for (int n = 0; n < MP_NUM_CHANNELS + 1; n++)
mp_chmap_sel_add_map(&sel, &oss_layouts[n]);
if (!ao_chmap_sel_adjust(ao, &sel, &channels))
goto fail;
int c, nchannels, reqchannels;
nchannels = reqchannels = channels.num;
// We only use SNDCTL_DSP_CHANNELS for >2 channels, in case some drivers don't have it
if (reqchannels > 2) {
if (ioctl(p->audio_fd, SNDCTL_DSP_CHANNELS, &nchannels) == -1) {
MP_ERR(ao, "Failed to set audio device to %d channels.\n",
reqchannels);
goto fail;
}
if (nchannels != reqchannels) {
// Fallback to stereo
nchannels = 2;
goto stereo;
}
} else {
stereo:
c = nchannels - 1;
if (ioctl(p->audio_fd, SNDCTL_DSP_STEREO, &c) == -1) {
MP_ERR(ao, "Failed to set audio device to %d channels.\n",
reqchannels);
goto fail;
}
if (!ao_chmap_sel_get_def(ao, &sel, &channels, c + 1))
goto fail;
}
MP_VERBOSE(ao, "using %d channels (requested: %d)\n",
channels.num, reqchannels);
// set rate
if (ioctl(p->audio_fd, SNDCTL_DSP_SPEED, &samplerate) == -1)
goto fail;
MP_VERBOSE(ao, "using %d Hz samplerate\n", samplerate);
}
audio_buf_info zz = {0};
if (ioctl(p->audio_fd, SNDCTL_DSP_GETOSPACE, &zz) == -1) {
int r = 0;
MP_WARN(ao, "driver doesn't support SNDCTL_DSP_GETOSPACE\n");
if (ioctl(p->audio_fd, SNDCTL_DSP_GETBLKSIZE, &r) == -1)
MP_VERBOSE(ao, "%d bytes/frag (config.h)\n", p->outburst);
else {
p->outburst = r;
MP_VERBOSE(ao, "%d bytes/frag (GETBLKSIZE)\n", p->outburst);
}
} else {
MP_VERBOSE(ao, "frags: %3d/%d (%d bytes/frag) free: %6d\n",
zz.fragments, zz.fragstotal, zz.fragsize, zz.bytes);
p->buffersize = zz.bytes;
p->outburst = zz.fragsize;
}
if (allow_format_changes) {
ao->format = format;
ao->samplerate = samplerate;
ao->channels = channels;
} else {
if (format != ao->format || samplerate != ao->samplerate ||
!mp_chmap_equals(&channels, &ao->channels))
{
MP_ERR(ao, "Could not reselect previous audio format.\n");
goto fail;
}
}
int sstride = channels.num * af_fmt_to_bytes(format);
p->outburst -= p->outburst % sstride; // round down
ao->period_size = p->outburst / sstride;
return 0;
fail:
close_device(ao);
return -1;
}
// open & setup audio device
// return: 0=success -1=fail
static int init(struct ao *ao)
{
struct priv *p = ao->priv;
const char *mchan = NULL;
if (p->cfg_oss_mixer_channel && p->cfg_oss_mixer_channel[0])
mchan = p->cfg_oss_mixer_channel;
if (mchan) {
int fd, devs, i;
if ((fd = open(p->oss_mixer_device, O_RDONLY)) == -1) {
MP_ERR(ao, "Can't open mixer device %s: %s\n",
p->oss_mixer_device, mp_strerror(errno));
} else {
ioctl(fd, SOUND_MIXER_READ_DEVMASK, &devs);
close(fd);
for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
if (!strcasecmp(mixer_channels[i], mchan)) {
if (!(devs & (1 << i))) {
MP_ERR(ao, "Audio card mixer does not have "
"channel '%s', using default.\n", mchan);
i = SOUND_MIXER_NRDEVICES + 1;
break;
}
p->oss_mixer_channel = i;
break;
}
}
if (i == SOUND_MIXER_NRDEVICES) {
MP_ERR(ao, "Audio card mixer does not have "
"channel '%s', using default.\n", mchan);
}
}
} else {
p->oss_mixer_channel = SOUND_MIXER_PCM;
}
MP_VERBOSE(ao, "using '%s' mixer device\n", p->oss_mixer_device);
MP_VERBOSE(ao, "using '%s' mixer channel\n", mixer_channels[p->oss_mixer_channel]);
ao->format = af_fmt_from_planar(ao->format);
if (reopen_device(ao, true) < 0)
goto fail;
if (p->buffersize == -1) {
// Measuring buffer size:
void *data = malloc(p->outburst);
if (!data) {
MP_ERR(ao, "Out of memory, or broken outburst size.\n");
goto fail;
}
p->buffersize = 0;
memset(data, 0, p->outburst);
while (p->buffersize < 0x40000 && device_writable(ao) > 0) {
(void)write(p->audio_fd, data, p->outburst);
p->buffersize += p->outburst;
}
free(data);
if (p->buffersize == 0) {
MP_ERR(ao, "Your OSS audio driver DOES NOT support poll().\n");
goto fail;
}
}
return 0;
fail:
uninit(ao);
return -1;
}
static void drain(struct ao *ao)
{
#ifdef SNDCTL_DSP_SYNC
struct priv *p = ao->priv;
// to get the buffer played
if (p->audio_fd != -1)
ioctl(p->audio_fd, SNDCTL_DSP_SYNC, NULL);
#endif
}
// stop playing and empty buffers (for seeking/pause)
static void reset(struct ao *ao)
{
#if KEEP_DEVICE
struct priv *p = ao->priv;
ioctl(p->audio_fd, SNDCTL_DSP_RESET, NULL);
#else
close_device(ao);
#endif
}
// plays 'len' samples of 'data'
// it should round it down to outburst*n
// return: number of samples played
static int play(struct ao *ao, void **data, int samples, int flags)
{
struct priv *p = ao->priv;
int len = samples * ao->sstride;
if (len == 0)
return len;
if (p->audio_fd < 0 && !p->device_failed && reopen_device(ao, false) < 0)
MP_ERR(ao, "Fatal error: *** CANNOT RE-OPEN / RESET AUDIO DEVICE ***\n");
if (p->audio_fd < 0) {
// Let playback continue normally, even with a closed device.
p->device_failed = true;
double now = mp_time_sec();
if (p->audio_end < now)
p->audio_end = now;
p->audio_end += samples / (double)ao->samplerate;
return samples;
}
if (len > p->outburst || !(flags & AOPLAY_FINAL_CHUNK)) {
len /= p->outburst;
len *= p->outburst;
}
len = write(p->audio_fd, data[0], len);
return len / ao->sstride;
}
// return: delay in seconds between first and last sample in buffer
static double get_delay(struct ao *ao)
{
struct priv *p = ao->priv;
if (p->audio_fd < 0) {
double rest = p->audio_end - mp_time_sec();
if (rest > 0)
return rest;
return 0;
}
/* Calculate how many bytes/second is sent out */
if (p->audio_delay_method == 2) {
#ifdef SNDCTL_DSP_GETODELAY
int r = 0;
if (ioctl(p->audio_fd, SNDCTL_DSP_GETODELAY, &r) != -1)
return r / (double)ao->bps;
#endif
p->audio_delay_method = 1; // fallback if not supported
}
if (p->audio_delay_method == 1) {
audio_buf_info zz = {0};
if (ioctl(p->audio_fd, SNDCTL_DSP_GETOSPACE, &zz) != -1) {
return (p->buffersize - zz.bytes) / (double)ao->bps;
}
p->audio_delay_method = 0; // fallback if not supported
}
return p->buffersize / (double)ao->bps;
}
// return: how many samples can be played without blocking
static int get_space(struct ao *ao)
{
struct priv *p = ao->priv;
audio_buf_info zz = {0};
if (ioctl(p->audio_fd, SNDCTL_DSP_GETOSPACE, &zz) != -1) {
// calculate exact buffer space:
return zz.fragments * zz.fragsize / ao->sstride;
}
if (p->audio_fd < 0 && p->device_failed && get_delay(ao) > 0.2)
return 0;
if (p->audio_fd < 0 || device_writable(ao) > 0)
return p->outburst / ao->sstride;
return 0;
}
// stop playing, keep buffers (for pause)
static void audio_pause(struct ao *ao)
{
struct priv *p = ao->priv;
p->prepause_samples = get_delay(ao) * ao->samplerate;
#if KEEP_DEVICE
ioctl(p->audio_fd, SNDCTL_DSP_RESET, NULL);
#else
close_device(ao);
#endif
}
// resume playing, after audio_pause()
static void audio_resume(struct ao *ao)
{
struct priv *p = ao->priv;
p->audio_end = 0;
if (p->prepause_samples > 0)
ao_play_silence(ao, p->prepause_samples);
}
static int audio_wait(struct ao *ao, pthread_mutex_t *lock)
{
struct priv *p = ao->priv;
struct pollfd fd = {.fd = p->audio_fd, .events = POLLOUT};
int r = ao_wait_poll(ao, &fd, 1, lock);
if (fd.revents & (POLLERR | POLLNVAL))
return -1;
return r;
}
static void list_devs(struct ao *ao, struct ao_device_list *list)
{
if (stat(PATH_DEV_DSP, &(struct stat){0}) == 0)
ao_device_list_add(list, ao, &(struct ao_device_desc){"", "Default"});
}
#define OPT_BASE_STRUCT struct priv
const struct ao_driver audio_out_oss = {
.description = "OSS/ioctl audio output",
.name = "oss",
.init = init,
.uninit = uninit,
.control = control,
.get_space = get_space,
.play = play,
.get_delay = get_delay,
.pause = audio_pause,
.resume = audio_resume,
.reset = reset,
.drain = drain,
.wait = audio_wait,
.wakeup = ao_wakeup_poll,
.list_devs = list_devs,
.priv_size = sizeof(struct priv),
.priv_defaults = &(const struct priv) {
.audio_fd = -1,
.audio_delay_method = 2,
.buffersize = -1,
.outburst = 512,
.oss_mixer_channel = SOUND_MIXER_PCM,
.oss_mixer_device = PATH_DEV_MIXER,
},
.options = (const struct m_option[]) {
OPT_STRING("mixer-device", oss_mixer_device, M_OPT_FILE),
OPT_STRING("mixer-channel", cfg_oss_mixer_channel, 0),
{0}
},
.options_prefix = "oss",
};
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