mpv/mixer.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 "config.h"
#include "libao2/audio_out.h"
#include "libaf/af.h"
#include "mp_msg.h"
#include "mixer.h"


void mixer_getvolume(mixer_t *mixer, float *l, float *r)
{
    *l = 0;
    *r = 0;
    if (!mixer->ao)
        return;

    ao_control_vol_t vol;
    if (mixer->softvol || CONTROL_OK != ao_control(mixer->ao,
                                                AOCONTROL_GET_VOLUME, &vol)) {
        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;
    }
    *r = vol.right;
    *l = vol.left;
}

void mixer_setvolume(mixer_t *mixer, float l, float r)
{
    if (!mixer->ao) {
        mixer->muted = 0;
        return;
    }
    ao_control_vol_t vol;
    vol.right = r;
    vol.left = l;
    if (mixer->softvol || CONTROL_OK != ao_control(mixer->ao,
                                                AOCONTROL_SET_VOLUME, &vol)) {
        // 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, MSGL_INFO,
                    "[Mixer] No hardware mixing, inserting volume filter.\n");
            if (af_add(mixer->afilter, "volume")) {
                if (!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");
                    return;
                }
            }
        }
    }
    mixer->muted = 0;
}

void mixer_incvolume(mixer_t *mixer)
{
    float mixer_l, mixer_r;
    mixer_getvolume(mixer, &mixer_l, &mixer_r);
    mixer_l += mixer->volstep;
    if (mixer_l > 100)
        mixer_l = 100;
    mixer_r += mixer->volstep;
    if (mixer_r > 100)
        mixer_r = 100;
    mixer_setvolume(mixer, mixer_l, mixer_r);
}

void mixer_decvolume(mixer_t *mixer)
{
    float mixer_l, mixer_r;
    mixer_getvolume(mixer, &mixer_l, &mixer_r);
    mixer_l -= mixer->volstep;
    if (mixer_l < 0)
        mixer_l = 0;
    mixer_r -= mixer->volstep;
    if (mixer_r < 0)
        mixer_r = 0;
    mixer_setvolume(mixer, mixer_l, mixer_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_mute(mixer_t *mixer)
{
    if (mixer->muted) {
        mixer_setvolume(mixer, mixer->last_l, mixer->last_r);
    } else {
        mixer_getvolume(mixer, &mixer->last_l, &mixer->last_r);
        mixer_setvolume(mixer, 0, 0);
        mixer->muted = 1;
    }
}

void mixer_getbalance(mixer_t *mixer, float *val)
{
    *val = 0.f;
    if (!mixer->afilter)
        return;
    af_control_any_rev(mixer->afilter, AF_CONTROL_PAN_BALANCE | AF_CONTROL_GET,
                       val);
}

void mixer_setbalance(mixer_t *mixer, float val)
{
    float level[AF_NCH];
    int i;
    af_control_ext_t arg_ext = { .arg = level };
    af_instance_t *af_pan_balance;

    if (!mixer->afilter)
        return;

    if (af_control_any_rev(mixer->afilter,
                           AF_CONTROL_PAN_BALANCE | AF_CONTROL_SET, &val))
        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);
}