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mpv/audio/mixer.c

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/*
* 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 <string.h>
#include <stdio.h>
#include <math.h>
#include <assert.h>
#include <libavutil/common.h>
#include "config.h"
#include "audio/out/ao.h"
#include "audio/filter/af.h"
#include "common/global.h"
#include "common/msg.h"
#include "mpv_talloc.h"
#include "mixer.h"
struct mixer {
struct mp_log *log;
struct MPOpts *opts;
struct ao *ao;
struct af_stream *af;
// Static, dependent on ao/softvol settings
bool softvol; // use AO (false) or af_volume (true)
bool persistent_volume; // volume does not need to be restored
bool emulate_mute; // if true, emulate mute with volume=0
// Last known values (possibly out of sync with reality)
float vol_l, vol_r;
bool muted;
// Used to decide whether we should unmute on uninit
bool muted_by_us;
/* Contains ao driver name or "softvol" if volume is not persistent
* and needs to be restored after the driver is reinitialized. */
const char *driver;
// Other stuff
float balance;
};
struct mixer *mixer_init(void *talloc_ctx, struct mpv_global *global)
{
struct mixer *mixer = talloc_ptrtype(talloc_ctx, mixer);
*mixer = (struct mixer) {
.log = mp_log_new(mixer, global->log, "mixer"),
.opts = global->opts,
.vol_l = 100,
.vol_r = 100,
.driver = "",
};
return mixer;
}
bool mixer_audio_initialized(struct mixer *mixer)
{
return !!mixer->ao;
}
float mixer_getmaxvolume(struct mixer *mixer)
{
// gain == 1
return mixer->softvol ? mixer->opts->softvol_max : 100;
}
static void checkvolume(struct mixer *mixer)
{
if (!mixer->ao)
return;
ao_control_vol_t vol = {mixer->vol_l, mixer->vol_r};
if (mixer->softvol) {
float gain;
if (!af_control_any_rev(mixer->af, AF_CONTROL_GET_VOLUME, &gain))
gain = 1.0;
vol.left = gain * 100.0;
vol.right = gain * 100.0;
} else {
MP_DBG(mixer, "Reading volume from AO.\n");
// Rely on the values not changing if the query is not supported
ao_control(mixer->ao, AOCONTROL_GET_VOLUME, &vol);
ao_control(mixer->ao, AOCONTROL_GET_MUTE, &mixer->muted);
}
float l = mixer->vol_l;
float r = mixer->vol_r;
if (mixer->emulate_mute && mixer->muted)
l = r = 0;
/* Try to detect cases where the volume has been changed by some external
* action (such as something else changing a shared system-wide volume).
* We don't test for exact equality, as some AOs may round the value
* we last set to some nearby supported value. 3 has been the default
* volume step for increase/decrease keys, and is apparently big enough
* to step to the next possible value in most setups.
*/
if (FFABS(vol.left - l) >= 3 || FFABS(vol.right - r) >= 3) {
mixer->vol_l = vol.left;
mixer->vol_r = vol.right;
if (mixer->emulate_mute)
mixer->muted = false;
}
mixer->muted_by_us &= mixer->muted;
}
void mixer_getvolume(struct mixer *mixer, float *l, float *r)
{
checkvolume(mixer);
*l = mixer->vol_l;
*r = mixer->vol_r;
}
static void setvolume_internal(struct mixer *mixer)
{
float l = mixer->vol_l, r = mixer->vol_r;
if (mixer->emulate_mute && mixer->muted)
l = r = 0;
if (!mixer->softvol) {
MP_DBG(mixer, "Setting volume on AO.\n");
struct ao_control_vol vol = {.left = l, .right = r};
if (ao_control(mixer->ao, AOCONTROL_SET_VOLUME, &vol) != CONTROL_OK)
MP_ERR(mixer, "Failed to change audio output volume.\n");
return;
}
float gain = (l + r) / 2.0 / 100.0;
if (!af_control_any_rev(mixer->af, AF_CONTROL_SET_VOLUME, &gain)) {
if (gain == 1.0)
return;
MP_VERBOSE(mixer, "Inserting volume filter.\n");
if (!(af_add(mixer->af, "volume", "softvol", NULL)
&& af_control_any_rev(mixer->af, AF_CONTROL_SET_VOLUME, &gain)))
MP_ERR(mixer, "No volume control available.\n");
}
}
void mixer_setvolume(struct mixer *mixer, float l, float r)
{
checkvolume(mixer); // to check mute status
float max = mixer_getmaxvolume(mixer);
mixer->vol_l = MPCLAMP(l, 0, max);
mixer->vol_r = MPCLAMP(r, 0, max);
if (mixer->ao)
setvolume_internal(mixer);
}
void mixer_getbothvolume(struct mixer *mixer, float *b)
{
float mixer_l, mixer_r;
mixer_getvolume(mixer, &mixer_l, &mixer_r);
*b = (mixer_l + mixer_r) / 2;
}
void mixer_setmute(struct mixer *mixer, bool mute)
{
checkvolume(mixer);
if (mute == mixer->muted)
return;
if (mixer->ao) {
mixer->muted = mute;
mixer->muted_by_us = mute;
if (mixer->emulate_mute) {
setvolume_internal(mixer);
} else {
ao_control(mixer->ao, AOCONTROL_SET_MUTE, &mute);
}
checkvolume(mixer);
} else {
mixer->muted = mute;
mixer->muted_by_us = mute;
}
}
bool mixer_getmute(struct mixer *mixer)
{
checkvolume(mixer);
return mixer->muted;
}
void mixer_addvolume(struct mixer *mixer, float step)
{
float vol_l, vol_r;
mixer_getvolume(mixer, &vol_l, &vol_r);
mixer_setvolume(mixer, vol_l + step, vol_r + step);
}
void mixer_getbalance(struct mixer *mixer, float *val)
{
if (mixer->af)
af_control_any_rev(mixer->af, AF_CONTROL_GET_PAN_BALANCE, &mixer->balance);
*val = mixer->balance;
}
/* NOTE: Currently the balance code is seriously buggy: it always changes
* the af_pan mapping between the first two input channels and first two
* output channels to particular values. These values make sense for an
* af_pan instance that was automatically inserted for balance control
* only and is otherwise an identity transform, but if the filter was
* there for another reason, then ignoring and overriding the original
* values is completely wrong.
*/
void mixer_setbalance(struct mixer *mixer, float val)
{
struct af_instance *af_pan_balance;
mixer->balance = val;
if (!mixer->af)
return;
if (af_control_any_rev(mixer->af, AF_CONTROL_SET_PAN_BALANCE, &val))
return;
if (val == 0)
return;
if (!(af_pan_balance = af_add(mixer->af, "pan", "autopan", NULL))) {
MP_ERR(mixer, "No balance control available.\n");
return;
}
/* make all other channels pass through since by default pan blocks all */
for (int i = 2; i < AF_NCH; i++) {
float level[AF_NCH] = {0};
level[i] = 1.f;
af_control_ext_t arg_ext = { .ch = i, .arg = level };
af_pan_balance->control(af_pan_balance, AF_CONTROL_SET_PAN_LEVEL,
&arg_ext);
}
af_pan_balance->control(af_pan_balance, AF_CONTROL_SET_PAN_BALANCE, &val);
}
char *mixer_get_volume_restore_data(struct mixer *mixer)
{
if (!mixer->driver[0])
return NULL;
return talloc_asprintf(NULL, "%s:%f:%f:%d", mixer->driver, mixer->vol_l,
mixer->vol_r, mixer->muted_by_us);
}
static void probe_softvol(struct mixer *mixer)
{
bool ao_perapp = ao_control(mixer->ao, AOCONTROL_HAS_PER_APP_VOLUME, 0) == 1;
bool ao_softvol = ao_control(mixer->ao, AOCONTROL_HAS_SOFT_VOLUME, 0) == 1;
assert(!(ao_perapp && ao_softvol));
mixer->persistent_volume = !ao_softvol;
if (mixer->opts->softvol == SOFTVOL_AUTO) {
// No system-wide volume => fine with AO volume control.
mixer->softvol = !ao_softvol && !ao_perapp;
} else {
mixer->softvol = mixer->opts->softvol == SOFTVOL_YES;
}
if (mixer->softvol)
mixer->persistent_volume = false;
MP_DBG(mixer, "Will use af_volume: %s\n", mixer->softvol ? "yes" : "no");
// If we can't use real volume control => force softvol.
if (!mixer->softvol) {
ao_control_vol_t vol;
if (ao_control(mixer->ao, AOCONTROL_GET_VOLUME, &vol) != CONTROL_OK) {
mixer->softvol = true;
MP_WARN(mixer, "Hardware volume control unavailable.\n");
}
}
// Probe native mute support.
mixer->emulate_mute = true;
if (!mixer->softvol) {
if (ao_control(mixer->ao, AOCONTROL_GET_MUTE, &(bool){0}) == CONTROL_OK)
mixer->emulate_mute = false;
}
}
static void restore_volume(struct mixer *mixer)
{
struct MPOpts *opts = mixer->opts;
struct ao *ao = mixer->ao;
float force_vol_l = -1, force_vol_r = -1;
int force_mute = -1;
const char *prev_driver = mixer->driver;
mixer->driver = mixer->softvol ? "softvol" : ao_get_name(ao);
if (!prev_driver[0])
prev_driver = mixer->driver;
// Restore old parameters if volume won't survive reinitialization.
// But not if volume scale is possibly different.
if (!mixer->persistent_volume && strcmp(mixer->driver, prev_driver) == 0) {
force_vol_l = mixer->vol_l;
force_vol_r = mixer->vol_r;
}
// Set mute if we disabled it on uninit last time.
if (mixer->muted_by_us)
force_mute = 1;
// Set parameters from command line.
if (opts->mixer_init_volume >= 0)
force_vol_l = force_vol_r = opts->mixer_init_volume;
if (opts->mixer_init_mute >= 0)
force_mute = opts->mixer_init_mute;
// Set parameters from playback resume.
char *data = mixer->opts->mixer_restore_volume_data;
if (!mixer->persistent_volume && data && data[0]) {
char drv[40];
float v_l, v_r;
int m;
if (sscanf(data, "%39[^:]:%f:%f:%d", drv, &v_l, &v_r, &m) == 4) {
if (strcmp(mixer->driver, drv) == 0) {
force_vol_l = v_l;
force_vol_r = v_r;
force_mute = !!m;
MP_DBG(mixer, "Restoring volume from resume config.\n");
}
}
talloc_free(mixer->opts->mixer_restore_volume_data);
mixer->opts->mixer_restore_volume_data = NULL;
}
// Using --volume should not reset the volume on every file (i.e. reinit),
// OTOH mpv --{ --volume 10 f1.mkv --} --{ --volume 20 f2.mkv --} must work.
// Resetting the option volumes to "auto" (-1) is easiest. If file local
// options (as shown above) are used, the option handler code will reset
// them to other values, and force the volume to be reset as well.
opts->mixer_init_volume = -1;
opts->mixer_init_mute = -1;
checkvolume(mixer);
if (force_vol_l >= 0 && force_vol_r >= 0) {
MP_DBG(mixer, "Restoring previous volume.\n");
mixer_setvolume(mixer, force_vol_l, force_vol_r);
}
if (force_mute >= 0) {
MP_DBG(mixer, "Restoring previous mute toggle.\n");
mixer_setmute(mixer, force_mute);
}
}
// Called after the audio filter chain is built or rebuilt.
// (Can be called multiple times, even without mixer_uninit() in-between.)
void mixer_reinit_audio(struct mixer *mixer, struct ao *ao, struct af_stream *af)
{
if (!ao || !af)
return;
mixer->ao = ao;
mixer->af = af;
MP_DBG(mixer, "Reinit...\n");
probe_softvol(mixer);
restore_volume(mixer);
if (mixer->balance != 0)
mixer_setbalance(mixer, mixer->balance);
}
/* Called before uninitializing the audio filter chain. The main purpose is to
* turn off mute, in case it's a global/persistent setting which might
* otherwise be left enabled even after this player instance exits.
*/
void mixer_uninit_audio(struct mixer *mixer)
{
if (!mixer->ao)
return;
MP_DBG(mixer, "Uninit...\n");
checkvolume(mixer);
if (mixer->muted_by_us && mixer->persistent_volume) {
MP_DBG(mixer, "Draining.\n");
/* Current audio output API combines playing the remaining buffered
* audio and uninitializing the AO into one operation, even though
* ideally unmute would happen between those two steps. We can't do
* volume changes after uninitialization, but we don't want the
* remaining audio to play at full volume either. Thus this
* workaround to drop remaining audio first. */
ao_reset(mixer->ao);
mixer_setmute(mixer, false);
/* We remember mute status and re-enable it if we play more audio
* in the same process. */
mixer->muted_by_us = true;
}
mixer->ao = NULL;
mixer->af = NULL;
}
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