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/*
* Copyright (C)2002 Anders Johansson ajh@atri.curtin.edu.au
*
* 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <math.h>
#include <limits.h>
#include "common/common.h"
#include "af.h"
#include "demux/demux.h"
struct priv {
float level; // User-specified gain level for each channel
float rgain; // Replaygain level
int rgain_track; // Enable/disable track based replaygain
int rgain_album; // Enable/disable album based replaygain
float rgain_preamp; // Set replaygain pre-amplification
int rgain_clip; // Enable/disable clipping prevention
int soft; // Enable/disable soft clipping
int fast; // Use fix-point volume control
int detach; // Detach if gain volume is neutral
float cfg_volume;
};
static int control(struct af_instance *af, int cmd, void *arg)
{
struct priv *s = af->priv;
switch (cmd) {
case AF_CONTROL_REINIT: {
struct mp_audio *in = arg;
mp_audio_copy_config(af->data, in);
mp_audio_force_interleaved_format(af->data);
if (s->fast && af_fmt_from_planar(in->format) != AF_FORMAT_FLOAT) {
mp_audio_set_format(af->data, AF_FORMAT_S16);
} else {
mp_audio_set_format(af->data, AF_FORMAT_FLOAT);
}
if (af_fmt_is_planar(in->format))
mp_audio_set_format(af->data, af_fmt_to_planar(af->data->format));
s->rgain = 1.0;
if ((s->rgain_track || s->rgain_album) && af->replaygain_data) {
float gain, peak;
if (s->rgain_track) {
gain = af->replaygain_data->track_gain;
peak = af->replaygain_data->track_peak;
} else {
gain = af->replaygain_data->album_gain;
peak = af->replaygain_data->album_peak;
}
gain += s->rgain_preamp;
af_from_dB(1, &gain, &s->rgain, 20.0, -200.0, 60.0);
if (!s->rgain_clip) // clipping prevention
s->rgain = MPMIN(s->rgain, 1.0 / peak);
}
if (s->detach && fabs(s->level + s->rgain - 2.0) < 0.00001)
return AF_DETACH;
return af_test_output(af, in);
}
case AF_CONTROL_SET_VOLUME:
s->level = *(float *)arg;
return AF_OK;
case AF_CONTROL_GET_VOLUME:
*(float *)arg = s->level;
return AF_OK;
}
return AF_UNKNOWN;
}
static void filter_plane(struct af_instance *af, void *ptr, int num_samples)
{
struct priv *s = af->priv;
float level = s->level + s->rgain - 1.0;
if (af_fmt_from_planar(af->data->format) == AF_FORMAT_S16) {
int16_t *a = ptr;
int vol = 256.0 * level;
if (vol != 256) {
for (int i = 0; i < num_samples; i++) {
int x = (a[i] * vol) >> 8;
a[i] = MPCLAMP(x, SHRT_MIN, SHRT_MAX);
}
}
} else if (af_fmt_from_planar(af->data->format) == AF_FORMAT_FLOAT) {
float *a = ptr;
float vol = level;
if (vol != 1.0) {
for (int i = 0; i < num_samples; i++) {
float x = a[i] * vol;
a[i] = s->soft ? af_softclip(x) : MPCLAMP(x, -1.0, 1.0);
}
}
}
}
static int filter(struct af_instance *af, struct mp_audio *data, int f)
{
for (int n = 0; n < data->num_planes; n++)
filter_plane(af, data->planes[n], data->samples * data->spf);
return 0;
}
static int af_open(struct af_instance *af)
{
struct priv *s = af->priv;
af->control = control;
af->filter = filter;
af_from_dB(1, &s->cfg_volume, &s->level, 20.0, -200.0, 60.0);
return AF_OK;
}
#define OPT_BASE_STRUCT struct priv
// Description of this filter
struct af_info af_info_volume = {
.info = "Volume control audio filter",
.name = "volume",
.flags = AF_FLAGS_NOT_REENTRANT,
.open = af_open,
.priv_size = sizeof(struct priv),
.options = (const struct m_option[]) {
OPT_FLOATRANGE("volumedb", cfg_volume, 0, -200, 60),
OPT_FLAG("replaygain-track", rgain_track, 0),
OPT_FLAG("replaygain-album", rgain_album, 0),
OPT_FLOATRANGE("replaygain-preamp", rgain_preamp, 0, -15, 15),
OPT_FLAG("replaygain-clip", rgain_clip, 0),
OPT_FLAG("softclip", soft, 0),
OPT_FLAG("s16", fast, 0),
OPT_FLAG("detach", detach, 0),
{0}
},
};
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