mpv/audio/mixer.c

401 lines
13 KiB
C

/*
* This file is part of MPlayer.
*
* MPlayer 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.
*
* MPlayer 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 MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <string.h>
#include <stdio.h>
#include <libavutil/common.h>
#include "config.h"
#include "audio/out/ao.h"
#include "audio/filter/af.h"
#include "mpvcore/mp_msg.h"
#include "talloc.h"
#include "mixer.h"
struct mixer {
struct MPOpts *opts;
struct ao *ao;
struct af_stream *af;
// Static, dependent on ao/softvol settings
bool softvol; // use AO (true) or af_volume (false)
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 MPOpts *opts)
{
struct mixer *mixer = talloc_ptrtype(talloc_ctx, mixer);
*mixer = (struct mixer) {
.opts = opts,
.vol_l = 100,
.vol_r = 100,
.driver = "",
};
return mixer;
}
bool mixer_audio_initialized(struct mixer *mixer)
{
return !!mixer->ao;
}
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 vals[AF_NCH];
if (!af_control_any_rev(mixer->af,
AF_CONTROL_VOLUME_LEVEL | AF_CONTROL_GET, vals))
vals[0] = vals[1] = 1.0;
vol.left = (vals[0] / (mixer->opts->softvol_max / 100.0)) * 100.0;
vol.right = (vals[1] / (mixer->opts->softvol_max / 100.0)) * 100.0;
} else {
// 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, float r)
{
struct ao_control_vol vol = {.left = l, .right = r};
if (!mixer->softvol) {
if (ao_control(mixer->ao, AOCONTROL_SET_VOLUME, &vol) != CONTROL_OK)
mp_tmsg(MSGT_GLOBAL, MSGL_ERR,
"[Mixer] Failed to change audio output volume.\n");
return;
}
float vals[AF_NCH];
vals[0] = l / 100.0 * mixer->opts->softvol_max / 100.0;
vals[1] = r / 100.0 * mixer->opts->softvol_max / 100.0;
for (int i = 2; i < AF_NCH; i++)
vals[i] = (vals[0] + vals[1]) / 2.0;
if (!af_control_any_rev(mixer->af,
AF_CONTROL_VOLUME_LEVEL | AF_CONTROL_SET,
vals))
{
mp_tmsg(MSGT_GLOBAL, MSGL_V, "[Mixer] Inserting volume filter.\n");
if (!(af_add(mixer->af, "volume", NULL)
&& af_control_any_rev(mixer->af,
AF_CONTROL_VOLUME_LEVEL | AF_CONTROL_SET,
vals)))
mp_tmsg(MSGT_GLOBAL, MSGL_ERR,
"[Mixer] No volume control available.\n");
}
}
void mixer_setvolume(struct mixer *mixer, float l, float r)
{
checkvolume(mixer); // to check mute status
if (mixer->vol_l == l && mixer->vol_r == r)
return; // just prevent af_volume insertion when not needed
mixer->vol_l = av_clipf(l, 0, 100);
mixer->vol_r = av_clipf(r, 0, 100);
if (mixer->ao && !(mixer->emulate_mute && mixer->muted))
setvolume_internal(mixer, mixer->vol_l, mixer->vol_r);
}
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, mixer->vol_l*!mute, mixer->vol_r*!mute);
} 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;
}
static void addvolume(struct mixer *mixer, float d)
{
float vol_l, vol_r;
mixer_getvolume(mixer, &vol_l, &vol_r);
mixer_setvolume(mixer, vol_l + d, vol_r + d);
}
void mixer_incvolume(struct mixer *mixer)
{
addvolume(mixer, mixer->opts->volstep);
}
void mixer_decvolume(struct mixer *mixer)
{
addvolume(mixer, -mixer->opts->volstep);
}
void mixer_getbalance(struct mixer *mixer, float *val)
{
if (mixer->af)
af_control_any_rev(mixer->af,
AF_CONTROL_PAN_BALANCE | AF_CONTROL_GET,
&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. In particular, this will break
* automatically inserted downmix filters; the original coefficients that
* are significantly below 1 will be overwritten with much higher values.
*/
void mixer_setbalance(struct mixer *mixer, float val)
{
float level[AF_NCH];
int i;
af_control_ext_t arg_ext = { .arg = level };
struct af_instance *af_pan_balance;
mixer->balance = val;
if (!mixer->af)
return;
if (af_control_any_rev(mixer->af,
AF_CONTROL_PAN_BALANCE | AF_CONTROL_SET, &val))
return;
if (val == 0 || mixer->ao->channels.num < 2)
return;
if (!(af_pan_balance = af_add(mixer->af, "pan", NULL))) {
mp_tmsg(MSGT_GLOBAL, MSGL_ERR,
"[Mixer] No balance control available.\n");
return;
}
/* make all other channels pass thru since by default pan blocks all */
memset(level, 0, sizeof(level));
for (i = 2; i < AF_NCH; i++) {
arg_ext.ch = i;
level[i] = 1.f;
af_pan_balance->control(af_pan_balance,
AF_CONTROL_PAN_LEVEL | AF_CONTROL_SET,
&arg_ext);
level[i] = 0.f;
}
af_pan_balance->control(af_pan_balance,
AF_CONTROL_PAN_BALANCE | AF_CONTROL_SET, &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)
{
if (mixer->opts->softvol == SOFTVOL_AUTO) {
// No system-wide volume => fine with AO volume control.
mixer->softvol = !(mixer->ao->per_application_mixer ||
mixer->ao->no_persistent_volume);
} else {
mixer->softvol = mixer->opts->softvol == SOFTVOL_YES;
}
// 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_tmsg(MSGT_GLOBAL, MSGL_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->driver->info->short_name;
bool restore = mixer->softvol || ao->no_persistent_volume;
// Restore old parameters if volume won't survive reinitialization.
// But not if volume scale is possibly different.
if (restore && 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 *restore_data = mixer->opts->mixer_restore_volume_data;
if (restore && restore_data && restore_data[0]) {
char drv[40];
float v_l, v_r;
int m;
if (sscanf(restore_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;
}
}
talloc_free(restore_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)
mixer_setvolume(mixer, force_vol_l, force_vol_r);
if (force_mute >= 0)
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;
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;
checkvolume(mixer);
if (mixer->muted_by_us) {
/* 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;
}