mirror of https://github.com/mpv-player/mpv
133 lines
3.4 KiB
C
133 lines
3.4 KiB
C
/*
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* Copyright (C) 2004 Alex Beregszaszi & Pierre Lombard
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*
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* This file is part of mpv.
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*
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* mpv 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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* mpv 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 mpv. If not, see <http://www.gnu.org/licenses/>.
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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 "common/common.h"
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#include "af.h"
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// Data for specific instances of this filter
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typedef struct af_extrastereo_s
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{
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float mul;
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}af_extrastereo_t;
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// Initialization and runtime control
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static int control(struct af_instance* af, int cmd, void* arg)
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{
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switch(cmd){
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case AF_CONTROL_REINIT:{
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// Sanity check
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if(!arg) return AF_ERROR;
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mp_audio_copy_config(af->data, (struct mp_audio*)arg);
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mp_audio_force_interleaved_format(af->data);
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mp_audio_set_num_channels(af->data, 2);
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if (af->data->format != AF_FORMAT_FLOAT)
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mp_audio_set_format(af->data, AF_FORMAT_S16);
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return af_test_output(af,(struct mp_audio*)arg);
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}
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}
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return AF_UNKNOWN;
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}
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// Filter data through filter
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static void play_s16(af_extrastereo_t *s, struct mp_audio* data)
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{
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register int i = 0;
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int16_t *a = (int16_t*)data->planes[0]; // Audio data
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int len = data->samples*data->nch; // Number of samples
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int avg, l, r;
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for (i = 0; i < len; i+=2)
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{
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avg = (a[i] + a[i + 1]) / 2;
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l = avg + (int)(s->mul * (a[i] - avg));
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r = avg + (int)(s->mul * (a[i + 1] - avg));
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a[i] = MPCLAMP(l, SHRT_MIN, SHRT_MAX);
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a[i + 1] = MPCLAMP(r, SHRT_MIN, SHRT_MAX);
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}
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}
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static void play_float(af_extrastereo_t *s, struct mp_audio* data)
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{
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register int i = 0;
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float *a = (float*)data->planes[0]; // Audio data
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int len = data->samples * data->nch; // Number of samples
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float avg, l, r;
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for (i = 0; i < len; i+=2)
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{
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avg = (a[i] + a[i + 1]) / 2;
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l = avg + (s->mul * (a[i] - avg));
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r = avg + (s->mul * (a[i + 1] - avg));
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a[i] = af_softclip(l);
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a[i + 1] = af_softclip(r);
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}
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}
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static int filter_frame(struct af_instance *af, struct mp_audio *data)
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{
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if (!data)
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return 0;
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if (af_make_writeable(af, data) < 0) {
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talloc_free(data);
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return -1;
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}
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if (data->format == AF_FORMAT_FLOAT) {
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play_float(af->priv, data);
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} else {
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play_s16(af->priv, data);
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}
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af_add_output_frame(af, data);
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return 0;
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}
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// Allocate memory and set function pointers
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static int af_open(struct af_instance* af){
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af->control=control;
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af->filter_frame = filter_frame;
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return AF_OK;
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}
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#define OPT_BASE_STRUCT af_extrastereo_t
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const struct af_info af_info_extrastereo = {
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.info = "Increase difference between audio channels",
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.name = "extrastereo",
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.flags = AF_FLAGS_NOT_REENTRANT,
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.open = af_open,
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.priv_size = sizeof(af_extrastereo_t),
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.options = (const struct m_option[]) {
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OPT_FLOAT("mul", mul, 0, OPTDEF_FLOAT(2.5)),
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{0}
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},
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};
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