mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
4bcb75ebae
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
568 lines
16 KiB
C
568 lines
16 KiB
C
/*
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* Copyright (c) 1999 Chris Bagwell
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* Copyright (c) 1999 Nick Bailey
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* Copyright (c) 2007 Rob Sykes <robs@users.sourceforge.net>
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* Copyright (c) 2013 Paul B Mahol
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* Copyright (c) 2014 Andrew Kelley
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* audio compand filter
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*/
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#include "libavutil/avassert.h"
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#include "libavutil/avstring.h"
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#include "libavutil/ffmath.h"
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#include "libavutil/opt.h"
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#include "libavutil/samplefmt.h"
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#include "audio.h"
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#include "avfilter.h"
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#include "internal.h"
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typedef struct ChanParam {
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double attack;
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double decay;
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double volume;
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} ChanParam;
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typedef struct CompandSegment {
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double x, y;
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double a, b;
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} CompandSegment;
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typedef struct CompandContext {
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const AVClass *class;
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int nb_segments;
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char *attacks, *decays, *points;
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CompandSegment *segments;
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ChanParam *channels;
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double in_min_lin;
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double out_min_lin;
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double curve_dB;
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double gain_dB;
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double initial_volume;
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double delay;
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AVFrame *delay_frame;
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int delay_samples;
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int delay_count;
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int delay_index;
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int64_t pts;
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int (*compand)(AVFilterContext *ctx, AVFrame *frame);
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} CompandContext;
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#define OFFSET(x) offsetof(CompandContext, x)
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#define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption compand_options[] = {
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{ "attacks", "set time over which increase of volume is determined", OFFSET(attacks), AV_OPT_TYPE_STRING, { .str = "0" }, 0, 0, A },
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{ "decays", "set time over which decrease of volume is determined", OFFSET(decays), AV_OPT_TYPE_STRING, { .str = "0.8" }, 0, 0, A },
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{ "points", "set points of transfer function", OFFSET(points), AV_OPT_TYPE_STRING, { .str = "-70/-70|-60/-20|1/0" }, 0, 0, A },
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{ "soft-knee", "set soft-knee", OFFSET(curve_dB), AV_OPT_TYPE_DOUBLE, { .dbl = 0.01 }, 0.01, 900, A },
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{ "gain", "set output gain", OFFSET(gain_dB), AV_OPT_TYPE_DOUBLE, { .dbl = 0 }, -900, 900, A },
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{ "volume", "set initial volume", OFFSET(initial_volume), AV_OPT_TYPE_DOUBLE, { .dbl = 0 }, -900, 0, A },
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{ "delay", "set delay for samples before sending them to volume adjuster", OFFSET(delay), AV_OPT_TYPE_DOUBLE, { .dbl = 0 }, 0, 20, A },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(compand);
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static av_cold int init(AVFilterContext *ctx)
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{
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CompandContext *s = ctx->priv;
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s->pts = AV_NOPTS_VALUE;
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return 0;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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CompandContext *s = ctx->priv;
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av_freep(&s->channels);
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av_freep(&s->segments);
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av_frame_free(&s->delay_frame);
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}
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static void count_items(char *item_str, int *nb_items)
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{
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char *p;
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*nb_items = 1;
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for (p = item_str; *p; p++) {
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if (*p == ' ' || *p == '|')
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(*nb_items)++;
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}
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}
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static void update_volume(ChanParam *cp, double in)
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{
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double delta = in - cp->volume;
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if (delta > 0.0)
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cp->volume += delta * cp->attack;
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else
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cp->volume += delta * cp->decay;
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}
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static double get_volume(CompandContext *s, double in_lin)
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{
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CompandSegment *cs;
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double in_log, out_log;
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int i;
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if (in_lin < s->in_min_lin)
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return s->out_min_lin;
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in_log = log(in_lin);
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for (i = 1; i < s->nb_segments; i++)
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if (in_log <= s->segments[i].x)
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break;
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cs = &s->segments[i - 1];
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in_log -= cs->x;
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out_log = cs->y + in_log * (cs->a * in_log + cs->b);
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return exp(out_log);
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}
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static int compand_nodelay(AVFilterContext *ctx, AVFrame *frame)
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{
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CompandContext *s = ctx->priv;
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AVFilterLink *inlink = ctx->inputs[0];
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const int channels = inlink->channels;
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const int nb_samples = frame->nb_samples;
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AVFrame *out_frame;
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int chan, i;
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int err;
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if (av_frame_is_writable(frame)) {
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out_frame = frame;
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} else {
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out_frame = ff_get_audio_buffer(ctx->outputs[0], nb_samples);
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if (!out_frame) {
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av_frame_free(&frame);
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return AVERROR(ENOMEM);
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}
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err = av_frame_copy_props(out_frame, frame);
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if (err < 0) {
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av_frame_free(&out_frame);
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av_frame_free(&frame);
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return err;
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}
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}
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for (chan = 0; chan < channels; chan++) {
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const double *src = (double *)frame->extended_data[chan];
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double *dst = (double *)out_frame->extended_data[chan];
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ChanParam *cp = &s->channels[chan];
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for (i = 0; i < nb_samples; i++) {
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update_volume(cp, fabs(src[i]));
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dst[i] = src[i] * get_volume(s, cp->volume);
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}
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}
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if (frame != out_frame)
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av_frame_free(&frame);
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return ff_filter_frame(ctx->outputs[0], out_frame);
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}
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#define MOD(a, b) (((a) >= (b)) ? (a) - (b) : (a))
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static int compand_delay(AVFilterContext *ctx, AVFrame *frame)
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{
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CompandContext *s = ctx->priv;
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AVFilterLink *inlink = ctx->inputs[0];
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const int channels = inlink->channels;
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const int nb_samples = frame->nb_samples;
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int chan, i, av_uninit(dindex), oindex, av_uninit(count);
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AVFrame *out_frame = NULL;
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int err;
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if (s->pts == AV_NOPTS_VALUE) {
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s->pts = (frame->pts == AV_NOPTS_VALUE) ? 0 : frame->pts;
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}
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av_assert1(channels > 0); /* would corrupt delay_count and delay_index */
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for (chan = 0; chan < channels; chan++) {
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AVFrame *delay_frame = s->delay_frame;
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const double *src = (double *)frame->extended_data[chan];
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double *dbuf = (double *)delay_frame->extended_data[chan];
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ChanParam *cp = &s->channels[chan];
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double *dst;
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count = s->delay_count;
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dindex = s->delay_index;
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for (i = 0, oindex = 0; i < nb_samples; i++) {
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const double in = src[i];
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update_volume(cp, fabs(in));
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if (count >= s->delay_samples) {
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if (!out_frame) {
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out_frame = ff_get_audio_buffer(ctx->outputs[0], nb_samples - i);
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if (!out_frame) {
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av_frame_free(&frame);
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return AVERROR(ENOMEM);
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}
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err = av_frame_copy_props(out_frame, frame);
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if (err < 0) {
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av_frame_free(&out_frame);
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av_frame_free(&frame);
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return err;
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}
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out_frame->pts = s->pts;
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s->pts += av_rescale_q(nb_samples - i,
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(AVRational){ 1, inlink->sample_rate },
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inlink->time_base);
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}
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dst = (double *)out_frame->extended_data[chan];
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dst[oindex++] = dbuf[dindex] * get_volume(s, cp->volume);
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} else {
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count++;
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}
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dbuf[dindex] = in;
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dindex = MOD(dindex + 1, s->delay_samples);
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}
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}
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s->delay_count = count;
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s->delay_index = dindex;
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av_frame_free(&frame);
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if (out_frame) {
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err = ff_filter_frame(ctx->outputs[0], out_frame);
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return err;
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}
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return 0;
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}
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static int compand_drain(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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CompandContext *s = ctx->priv;
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const int channels = outlink->channels;
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AVFrame *frame = NULL;
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int chan, i, dindex;
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/* 2048 is to limit output frame size during drain */
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frame = ff_get_audio_buffer(outlink, FFMIN(2048, s->delay_count));
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if (!frame)
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return AVERROR(ENOMEM);
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frame->pts = s->pts;
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s->pts += av_rescale_q(frame->nb_samples,
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(AVRational){ 1, outlink->sample_rate }, outlink->time_base);
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av_assert0(channels > 0);
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for (chan = 0; chan < channels; chan++) {
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AVFrame *delay_frame = s->delay_frame;
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double *dbuf = (double *)delay_frame->extended_data[chan];
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double *dst = (double *)frame->extended_data[chan];
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ChanParam *cp = &s->channels[chan];
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dindex = s->delay_index;
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for (i = 0; i < frame->nb_samples; i++) {
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dst[i] = dbuf[dindex] * get_volume(s, cp->volume);
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dindex = MOD(dindex + 1, s->delay_samples);
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}
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}
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s->delay_count -= frame->nb_samples;
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s->delay_index = dindex;
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return ff_filter_frame(outlink, frame);
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}
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static int config_output(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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CompandContext *s = ctx->priv;
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const int sample_rate = outlink->sample_rate;
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double radius = s->curve_dB * M_LN10 / 20.0;
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char *p, *saveptr = NULL;
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const int channels = outlink->channels;
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int nb_attacks, nb_decays, nb_points;
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int new_nb_items, num;
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int i;
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int err;
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count_items(s->attacks, &nb_attacks);
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count_items(s->decays, &nb_decays);
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count_items(s->points, &nb_points);
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if (channels <= 0) {
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av_log(ctx, AV_LOG_ERROR, "Invalid number of channels: %d\n", channels);
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return AVERROR(EINVAL);
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}
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if (nb_attacks > channels || nb_decays > channels) {
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av_log(ctx, AV_LOG_WARNING,
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"Number of attacks/decays bigger than number of channels. Ignoring rest of entries.\n");
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nb_attacks = FFMIN(nb_attacks, channels);
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nb_decays = FFMIN(nb_decays, channels);
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}
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uninit(ctx);
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s->channels = av_calloc(channels, sizeof(*s->channels));
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s->nb_segments = (nb_points + 4) * 2;
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s->segments = av_calloc(s->nb_segments, sizeof(*s->segments));
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if (!s->channels || !s->segments) {
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uninit(ctx);
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return AVERROR(ENOMEM);
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}
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p = s->attacks;
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for (i = 0, new_nb_items = 0; i < nb_attacks; i++) {
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char *tstr = av_strtok(p, " |", &saveptr);
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if (!tstr) {
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uninit(ctx);
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return AVERROR(EINVAL);
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}
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p = NULL;
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new_nb_items += sscanf(tstr, "%lf", &s->channels[i].attack) == 1;
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if (s->channels[i].attack < 0) {
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uninit(ctx);
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return AVERROR(EINVAL);
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}
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}
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nb_attacks = new_nb_items;
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p = s->decays;
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for (i = 0, new_nb_items = 0; i < nb_decays; i++) {
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char *tstr = av_strtok(p, " |", &saveptr);
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if (!tstr) {
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uninit(ctx);
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return AVERROR(EINVAL);
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}
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p = NULL;
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new_nb_items += sscanf(tstr, "%lf", &s->channels[i].decay) == 1;
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if (s->channels[i].decay < 0) {
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uninit(ctx);
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return AVERROR(EINVAL);
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}
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}
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nb_decays = new_nb_items;
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if (nb_attacks != nb_decays) {
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av_log(ctx, AV_LOG_ERROR,
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"Number of attacks %d differs from number of decays %d.\n",
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nb_attacks, nb_decays);
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uninit(ctx);
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return AVERROR(EINVAL);
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}
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for (i = nb_decays; i < channels; i++) {
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s->channels[i].attack = s->channels[nb_decays - 1].attack;
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s->channels[i].decay = s->channels[nb_decays - 1].decay;
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}
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#define S(x) s->segments[2 * ((x) + 1)]
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p = s->points;
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for (i = 0, new_nb_items = 0; i < nb_points; i++) {
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char *tstr = av_strtok(p, " |", &saveptr);
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p = NULL;
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if (!tstr || sscanf(tstr, "%lf/%lf", &S(i).x, &S(i).y) != 2) {
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av_log(ctx, AV_LOG_ERROR,
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"Invalid and/or missing input/output value.\n");
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uninit(ctx);
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return AVERROR(EINVAL);
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}
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if (i && S(i - 1).x > S(i).x) {
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av_log(ctx, AV_LOG_ERROR,
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"Transfer function input values must be increasing.\n");
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uninit(ctx);
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return AVERROR(EINVAL);
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}
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S(i).y -= S(i).x;
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av_log(ctx, AV_LOG_DEBUG, "%d: x=%f y=%f\n", i, S(i).x, S(i).y);
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new_nb_items++;
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}
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num = new_nb_items;
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/* Add 0,0 if necessary */
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if (num == 0 || S(num - 1).x)
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num++;
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#undef S
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#define S(x) s->segments[2 * (x)]
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/* Add a tail off segment at the start */
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S(0).x = S(1).x - 2 * s->curve_dB;
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S(0).y = S(1).y;
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num++;
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/* Join adjacent colinear segments */
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for (i = 2; i < num; i++) {
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double g1 = (S(i - 1).y - S(i - 2).y) * (S(i - 0).x - S(i - 1).x);
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double g2 = (S(i - 0).y - S(i - 1).y) * (S(i - 1).x - S(i - 2).x);
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int j;
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if (fabs(g1 - g2))
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continue;
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num--;
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for (j = --i; j < num; j++)
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S(j) = S(j + 1);
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}
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for (i = 0; i < s->nb_segments; i += 2) {
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s->segments[i].y += s->gain_dB;
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s->segments[i].x *= M_LN10 / 20;
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s->segments[i].y *= M_LN10 / 20;
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}
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#define L(x) s->segments[i - (x)]
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for (i = 4; i < s->nb_segments; i += 2) {
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double x, y, cx, cy, in1, in2, out1, out2, theta, len, r;
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L(4).a = 0;
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L(4).b = (L(2).y - L(4).y) / (L(2).x - L(4).x);
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L(2).a = 0;
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L(2).b = (L(0).y - L(2).y) / (L(0).x - L(2).x);
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theta = atan2(L(2).y - L(4).y, L(2).x - L(4).x);
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len = hypot(L(2).x - L(4).x, L(2).y - L(4).y);
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r = FFMIN(radius, len);
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L(3).x = L(2).x - r * cos(theta);
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L(3).y = L(2).y - r * sin(theta);
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theta = atan2(L(0).y - L(2).y, L(0).x - L(2).x);
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len = hypot(L(0).x - L(2).x, L(0).y - L(2).y);
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r = FFMIN(radius, len / 2);
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x = L(2).x + r * cos(theta);
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y = L(2).y + r * sin(theta);
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cx = (L(3).x + L(2).x + x) / 3;
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cy = (L(3).y + L(2).y + y) / 3;
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L(2).x = x;
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L(2).y = y;
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in1 = cx - L(3).x;
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out1 = cy - L(3).y;
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in2 = L(2).x - L(3).x;
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out2 = L(2).y - L(3).y;
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L(3).a = (out2 / in2 - out1 / in1) / (in2 - in1);
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L(3).b = out1 / in1 - L(3).a * in1;
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}
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L(3).x = 0;
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L(3).y = L(2).y;
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s->in_min_lin = exp(s->segments[1].x);
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s->out_min_lin = exp(s->segments[1].y);
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for (i = 0; i < channels; i++) {
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|
ChanParam *cp = &s->channels[i];
|
|
|
|
if (cp->attack > 1.0 / sample_rate)
|
|
cp->attack = 1.0 - exp(-1.0 / (sample_rate * cp->attack));
|
|
else
|
|
cp->attack = 1.0;
|
|
if (cp->decay > 1.0 / sample_rate)
|
|
cp->decay = 1.0 - exp(-1.0 / (sample_rate * cp->decay));
|
|
else
|
|
cp->decay = 1.0;
|
|
cp->volume = ff_exp10(s->initial_volume / 20);
|
|
}
|
|
|
|
s->delay_samples = s->delay * sample_rate;
|
|
if (s->delay_samples <= 0) {
|
|
s->compand = compand_nodelay;
|
|
return 0;
|
|
}
|
|
|
|
s->delay_frame = av_frame_alloc();
|
|
if (!s->delay_frame) {
|
|
uninit(ctx);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
s->delay_frame->format = outlink->format;
|
|
s->delay_frame->nb_samples = s->delay_samples;
|
|
s->delay_frame->channel_layout = outlink->channel_layout;
|
|
|
|
err = av_frame_get_buffer(s->delay_frame, 0);
|
|
if (err)
|
|
return err;
|
|
|
|
s->compand = compand_delay;
|
|
return 0;
|
|
}
|
|
|
|
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
|
|
{
|
|
AVFilterContext *ctx = inlink->dst;
|
|
CompandContext *s = ctx->priv;
|
|
|
|
return s->compand(ctx, frame);
|
|
}
|
|
|
|
static int request_frame(AVFilterLink *outlink)
|
|
{
|
|
AVFilterContext *ctx = outlink->src;
|
|
CompandContext *s = ctx->priv;
|
|
int ret = 0;
|
|
|
|
ret = ff_request_frame(ctx->inputs[0]);
|
|
|
|
if (ret == AVERROR_EOF && !ctx->is_disabled && s->delay_count)
|
|
ret = compand_drain(outlink);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const AVFilterPad compand_inputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.filter_frame = filter_frame,
|
|
},
|
|
};
|
|
|
|
static const AVFilterPad compand_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.request_frame = request_frame,
|
|
.config_props = config_output,
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
},
|
|
};
|
|
|
|
|
|
const AVFilter ff_af_compand = {
|
|
.name = "compand",
|
|
.description = NULL_IF_CONFIG_SMALL(
|
|
"Compress or expand audio dynamic range."),
|
|
.priv_size = sizeof(CompandContext),
|
|
.priv_class = &compand_class,
|
|
.init = init,
|
|
.uninit = uninit,
|
|
FILTER_INPUTS(compand_inputs),
|
|
FILTER_OUTPUTS(compand_outputs),
|
|
FILTER_SINGLE_SAMPLEFMT(AV_SAMPLE_FMT_DBLP),
|
|
};
|