mpv/audio/mixer.c

293 lines
10 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 <libavutil/common.h>
#include "config.h"
#include "audio/out/ao.h"
#include "audio/filter/af.h"
#include "core/mp_msg.h"
#include "mixer.h"
static void checkvolume(struct mixer *mixer)
{
if (!mixer->ao)
return;
if (mixer->softvol == SOFTVOL_AUTO) {
mixer->softvol = mixer->ao->per_application_mixer
? SOFTVOL_NO : SOFTVOL_YES;
}
ao_control_vol_t vol;
if (mixer->softvol || CONTROL_OK != ao_control(mixer->ao,
AOCONTROL_GET_VOLUME, &vol)) {
mixer->softvol = SOFTVOL_YES;
if (!mixer->afilter)
return;
float db_vals[AF_NCH];
if (!af_control_any_rev(mixer->afilter,
AF_CONTROL_VOLUME_LEVEL | AF_CONTROL_GET, db_vals))
db_vals[0] = db_vals[1] = 1.0;
else
af_from_dB(2, db_vals, db_vals, 20.0, -200.0, 60.0);
vol.left = (db_vals[0] / (mixer->softvol_max / 100.0)) * 100.0;
vol.right = (db_vals[1] / (mixer->softvol_max / 100.0)) * 100.0;
}
float l = mixer->vol_l;
float r = mixer->vol_r;
if (mixer->muted_using_volume)
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->muted_using_volume)
mixer->muted = false;
}
if (!mixer->softvol)
// Rely on the value not changing if the query is not supported
ao_control(mixer->ao, AOCONTROL_GET_MUTE, &mixer->muted);
mixer->muted_by_us &= mixer->muted;
mixer->muted_using_volume &= mixer->muted;
}
void mixer_getvolume(mixer_t *mixer, float *l, float *r)
{
checkvolume(mixer);
*l = mixer->vol_l;
*r = mixer->vol_r;
}
static void setvolume_internal(mixer_t *mixer, float l, float r)
{
struct ao_control_vol vol = {.left = l, .right = r};
if (!mixer->softvol) {
// relies on the driver data being permanent (so ptr stays valid)
mixer->restore_volume = mixer->ao->no_persistent_volume ?
mixer->ao->driver->info->short_name : NULL;
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;
}
mixer->restore_volume = "softvol";
if (!mixer->afilter)
return;
// af_volume uses values in dB
float db_vals[AF_NCH];
int i;
db_vals[0] = (l / 100.0) * (mixer->softvol_max / 100.0);
db_vals[1] = (r / 100.0) * (mixer->softvol_max / 100.0);
for (i = 2; i < AF_NCH; i++)
db_vals[i] = ((l + r) / 100.0) * (mixer->softvol_max / 100.0) / 2.0;
af_to_dB(AF_NCH, db_vals, db_vals, 20.0);
if (!af_control_any_rev(mixer->afilter,
AF_CONTROL_VOLUME_LEVEL | AF_CONTROL_SET,
db_vals))
{
mp_tmsg(MSGT_GLOBAL, mixer->softvol ? MSGL_V : MSGL_WARN,
"[Mixer] No hardware mixing, inserting volume filter.\n");
if (!(af_add(mixer->afilter, "volume")
&& af_control_any_rev(mixer->afilter,
AF_CONTROL_VOLUME_LEVEL | AF_CONTROL_SET,
db_vals)))
mp_tmsg(MSGT_GLOBAL, MSGL_ERR,
"[Mixer] No volume control available.\n");
}
}
void mixer_setvolume(mixer_t *mixer, float l, float r)
{
checkvolume(mixer); // to check mute status and AO support for volume
mixer->vol_l = av_clipf(l, 0, 100);
mixer->vol_r = av_clipf(r, 0, 100);
if (!mixer->ao || mixer->muted_using_volume)
return;
setvolume_internal(mixer, mixer->vol_l, mixer->vol_r);
}
void mixer_getbothvolume(mixer_t *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) {
if (!mixer->softvol && !mixer->muted_using_volume && ao_control(
mixer->ao, AOCONTROL_SET_MUTE, &mute) == CONTROL_OK) {
mixer->muted_using_volume = false;
} else {
setvolume_internal(mixer, mixer->vol_l*!mute, mixer->vol_r*!mute);
mixer->muted_using_volume = mute;
}
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)
{
checkvolume(mixer);
mixer_setvolume(mixer, mixer->vol_l + d, mixer->vol_r + d);
if (d > 0)
mixer_setmute(mixer, false);
}
void mixer_incvolume(mixer_t *mixer)
{
addvolume(mixer, mixer->volstep);
}
void mixer_decvolume(mixer_t *mixer)
{
addvolume(mixer, -mixer->volstep);
}
void mixer_getbalance(mixer_t *mixer, float *val)
{
if (mixer->afilter)
af_control_any_rev(mixer->afilter,
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(mixer_t *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->afilter)
return;
if (af_control_any_rev(mixer->afilter,
AF_CONTROL_PAN_BALANCE | AF_CONTROL_SET, &val))
return;
if (val == 0 || mixer->ao->channels < 2)
return;
if (!(af_pan_balance = af_add(mixer->afilter, "pan"))) {
mp_tmsg(MSGT_GLOBAL, MSGL_ERR,
"[Mixer] No balance control available.\n");
return;
}
af_init(mixer->afilter);
/* 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);
}
// Called after the audio filter chain is built or rebuilt.
void mixer_reinit(struct mixer *mixer, struct ao *ao)
{
mixer->ao = ao;
/* Use checkvolume() to see if softvol needs to be enabled because of
* lacking AO support, but first store values it could overwrite. */
float left = mixer->vol_l, right = mixer->vol_r;
bool muted = mixer->muted_by_us;
checkvolume(mixer);
/* Try to avoid restoring volume stored from one control method with
* another. Especially, restoring softvol volume (typically high) on
* system mixer could have very nasty effects. */
const char *restore_reason = mixer->softvol ? "softvol" :
mixer->ao->driver->info->short_name;
if (mixer->restore_volume && !strcmp(mixer->restore_volume,
restore_reason))
mixer_setvolume(mixer, left, right);
/* We turn mute off at AO uninit, so it has to be restored (unless
* we're reinitializing filter chain while keeping AO); but we only
* enable mute, not turn external mute off. */
if (muted)
mixer_setmute(mixer, true);
if (mixer->balance != 0)
mixer_setbalance(mixer, mixer->balance);
}
/* Called before uninitializing the audio output. 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(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;
}