mirror of https://github.com/mpv-player/mpv
119 lines
3.5 KiB
C
119 lines
3.5 KiB
C
/*
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* Copyright (C)2002 Anders Johansson ajh@atri.curtin.edu.au
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*
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* This file is part of MPlayer.
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*
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* MPlayer is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* MPlayer is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with MPlayer; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <inttypes.h>
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#include <math.h>
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#include <limits.h>
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#include "mpvcore/mp_common.h"
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#include "af.h"
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struct priv {
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float level; // Gain level for each channel
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int soft; // Enable/disable soft clipping
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int fast; // Use fix-point volume control
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float cfg_volume;
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};
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static int control(struct af_instance *af, int cmd, void *arg)
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{
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struct priv *s = af->priv;
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switch (cmd) {
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case AF_CONTROL_REINIT:
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mp_audio_copy_config(af->data, (struct mp_audio *)arg);
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if (s->fast && (((struct mp_audio *)arg)->format != AF_FORMAT_FLOAT_NE))
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mp_audio_set_format(af->data, AF_FORMAT_S16_NE);
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else {
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mp_audio_set_format(af->data, AF_FORMAT_FLOAT_NE);
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}
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return af_test_output(af, (struct mp_audio *)arg);
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case AF_CONTROL_VOLUME_LEVEL | AF_CONTROL_SET:
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s->level = *(float *)arg;
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return AF_OK;
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case AF_CONTROL_VOLUME_LEVEL | AF_CONTROL_GET:
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*(float *)arg = s->level;
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return AF_OK;
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}
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return AF_UNKNOWN;
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}
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static struct mp_audio *play(struct af_instance *af, struct mp_audio *data)
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{
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struct mp_audio *c = data;
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struct priv *s = af->priv;
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if (af->data->format == AF_FORMAT_S16_NE) {
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int16_t *a = c->audio;
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int len = c->len / 2;
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int vol = 256.0 * s->level;
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if (vol != 256) {
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for (int i = 0; i < len; i++) {
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int x = (a[i] * vol) >> 8;
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a[i] = MPCLAMP(x, SHRT_MIN, SHRT_MAX);
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}
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}
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} else if (af->data->format == AF_FORMAT_FLOAT_NE) {
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float *a = c->audio;
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int len = c->len / 4;
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float vol = s->level;
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if (vol != 1.0) {
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for (int i = 0; i < len; i++) {
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float x = a[i] * vol;
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a[i] = s->soft ? af_softclip(x) : MPCLAMP(x, -1.0, 1.0);
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}
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}
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}
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return c;
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}
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static int af_open(struct af_instance *af)
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{
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struct priv *s = af->priv;
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af->control = control;
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af->play = play;
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af->mul = 1;
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af->data = talloc_zero(af, struct mp_audio);
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af_from_dB(1, &s->cfg_volume, &s->level, 20.0, -200.0, 60.0);
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return AF_OK;
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}
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#define OPT_BASE_STRUCT struct priv
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// Description of this filter
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struct af_info af_info_volume = {
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.info = "Volume control audio filter",
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.name = "volume",
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.flags = AF_FLAGS_NOT_REENTRANT,
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.open = af_open,
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.priv_size = sizeof(struct priv),
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.options = (const struct m_option[]) {
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OPT_FLOATRANGE("volumedb", cfg_volume, 0, -200, 60),
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OPT_FLAG("softclip", soft, 0),
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OPT_FLAG("s16", fast, 0),
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{0}
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},
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};
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