FFmpeg coverage

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavfilter/af_sidechaincompress.c	Lines:	0	186	0.0 %
Date:	2021-04-14 23:45:22	Branches:	0	116	0.0 %


/*
 * Copyright (C) 2001-2010 Krzysztof Foltman, Markus Schmidt, Thor Harald Johansen and others
 * Copyright (c) 2015 Paul B Mahol
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * Audio (Sidechain) Compressor filter
 */

#include "libavutil/audio_fifo.h"
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/opt.h"

#include "audio.h"
#include "avfilter.h"
#include "filters.h"
#include "formats.h"
#include "hermite.h"
#include "internal.h"

typedef struct SidechainCompressContext {
    const AVClass *class;

    double level_in;
    double level_sc;
    double attack, attack_coeff;
    double release, release_coeff;
    double lin_slope;
    double ratio;
    double threshold;
    double makeup;
    double mix;
    double thres;
    double knee;
    double knee_start;
    double knee_stop;
    double lin_knee_start;
    double lin_knee_stop;
    double adj_knee_start;
    double adj_knee_stop;
    double compressed_knee_start;
    double compressed_knee_stop;
    int link;
    int detection;
    int mode;

    AVAudioFifo *fifo[2];
    int64_t pts;
} SidechainCompressContext;

#define OFFSET(x) offsetof(SidechainCompressContext, x)
#define A AV_OPT_FLAG_AUDIO_PARAM
#define F AV_OPT_FLAG_FILTERING_PARAM
#define R AV_OPT_FLAG_RUNTIME_PARAM

static const AVOption options[] = {
    { "level_in",  "set input gain",     OFFSET(level_in),  AV_OPT_TYPE_DOUBLE, {.dbl=1},        0.015625,   64, A|F|R },
    { "mode",      "set mode",           OFFSET(mode),      AV_OPT_TYPE_INT,    {.i64=0},               0,    1, A|F|R, "mode" },
    {   "downward",0,                    0,                 AV_OPT_TYPE_CONST,  {.i64=0},               0,    0, A|F|R, "mode" },
    {   "upward",  0,                    0,                 AV_OPT_TYPE_CONST,  {.i64=1},               0,    0, A|F|R, "mode" },
    { "threshold", "set threshold",      OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl=0.125}, 0.000976563,    1, A|F|R },
    { "ratio",     "set ratio",          OFFSET(ratio),     AV_OPT_TYPE_DOUBLE, {.dbl=2},               1,   20, A|F|R },
    { "attack",    "set attack",         OFFSET(attack),    AV_OPT_TYPE_DOUBLE, {.dbl=20},           0.01, 2000, A|F|R },
    { "release",   "set release",        OFFSET(release),   AV_OPT_TYPE_DOUBLE, {.dbl=250},          0.01, 9000, A|F|R },
    { "makeup",    "set make up gain",   OFFSET(makeup),    AV_OPT_TYPE_DOUBLE, {.dbl=1},               1,   64, A|F|R },
    { "knee",      "set knee",           OFFSET(knee),      AV_OPT_TYPE_DOUBLE, {.dbl=2.82843},         1,    8, A|F|R },
    { "link",      "set link type",      OFFSET(link),      AV_OPT_TYPE_INT,    {.i64=0},               0,    1, A|F|R, "link" },
    {   "average", 0,                    0,                 AV_OPT_TYPE_CONST,  {.i64=0},               0,    0, A|F|R, "link" },
    {   "maximum", 0,                    0,                 AV_OPT_TYPE_CONST,  {.i64=1},               0,    0, A|F|R, "link" },
    { "detection", "set detection",      OFFSET(detection), AV_OPT_TYPE_INT,    {.i64=1},               0,    1, A|F|R, "detection" },
    {   "peak",    0,                    0,                 AV_OPT_TYPE_CONST,  {.i64=0},               0,    0, A|F|R, "detection" },
    {   "rms",     0,                    0,                 AV_OPT_TYPE_CONST,  {.i64=1},               0,    0, A|F|R, "detection" },
    { "level_sc",  "set sidechain gain", OFFSET(level_sc),  AV_OPT_TYPE_DOUBLE, {.dbl=1},        0.015625,   64, A|F|R },
    { "mix",       "set mix",            OFFSET(mix),       AV_OPT_TYPE_DOUBLE, {.dbl=1},               0,    1, A|F|R },
    { NULL }
};

#define sidechaincompress_options options
AVFILTER_DEFINE_CLASS(sidechaincompress);

// A fake infinity value (because real infinity may break some hosts)
#define FAKE_INFINITY (65536.0 * 65536.0)

// Check for infinity (with appropriate-ish tolerance)
#define IS_FAKE_INFINITY(value) (fabs(value-FAKE_INFINITY) < 1.0)

static double output_gain(double lin_slope, double ratio, double thres,
                          double knee, double knee_start, double knee_stop,
                          double compressed_knee_start,
                          double compressed_knee_stop,
                          int detection, int mode)
{
    double slope = log(lin_slope);
    double gain = 0.0;
    double delta = 0.0;

    if (detection)
        slope *= 0.5;

    if (IS_FAKE_INFINITY(ratio)) {
        gain = thres;
        delta = 0.0;
    } else {
        gain = (slope - thres) / ratio + thres;
        delta = 1.0 / ratio;
    }

    if (mode) {
        if (knee > 1.0 && slope > knee_start)
            gain = hermite_interpolation(slope, knee_stop, knee_start,
                                         knee_stop, compressed_knee_start,
                                         1.0, delta);
    } else {
        if (knee > 1.0 && slope < knee_stop)
            gain = hermite_interpolation(slope, knee_start, knee_stop,
                                         knee_start, compressed_knee_stop,
                                         1.0, delta);
    }

    return exp(gain - slope);
}

static int compressor_config_output(AVFilterLink *outlink)
{
    AVFilterContext *ctx = outlink->src;
    SidechainCompressContext *s = ctx->priv;

    s->thres = log(s->threshold);
    s->lin_knee_start = s->threshold / sqrt(s->knee);
    s->lin_knee_stop = s->threshold * sqrt(s->knee);
    s->adj_knee_start = s->lin_knee_start * s->lin_knee_start;
    s->adj_knee_stop = s->lin_knee_stop * s->lin_knee_stop;
    s->knee_start = log(s->lin_knee_start);
    s->knee_stop = log(s->lin_knee_stop);
    s->compressed_knee_start = (s->knee_start - s->thres) / s->ratio + s->thres;
    s->compressed_knee_stop = (s->knee_stop - s->thres) / s->ratio + s->thres;

    s->attack_coeff = FFMIN(1., 1. / (s->attack * outlink->sample_rate / 4000.));
    s->release_coeff = FFMIN(1., 1. / (s->release * outlink->sample_rate / 4000.));

    return 0;
}

static void compressor(SidechainCompressContext *s,
                       const double *src, double *dst, const double *scsrc, int nb_samples,
                       double level_in, double level_sc,
                       AVFilterLink *inlink, AVFilterLink *sclink)
{
    const double makeup = s->makeup;
    const double mix = s->mix;
    int i, c;

    for (i = 0; i < nb_samples; i++) {
        double abs_sample, gain = 1.0;
        double detector;
        int detected;

        abs_sample = fabs(scsrc[0] * level_sc);

        if (s->link == 1) {
            for (c = 1; c < sclink->channels; c++)
                abs_sample = FFMAX(fabs(scsrc[c] * level_sc), abs_sample);
        } else {
            for (c = 1; c < sclink->channels; c++)
                abs_sample += fabs(scsrc[c] * level_sc);

            abs_sample /= sclink->channels;
        }

        if (s->detection)
            abs_sample *= abs_sample;

        s->lin_slope += (abs_sample - s->lin_slope) * (abs_sample > s->lin_slope ? s->attack_coeff : s->release_coeff);

        if (s->mode) {
            detector = (s->detection ? s->adj_knee_stop : s->lin_knee_stop);
            detected = s->lin_slope < detector;
        } else {
            detector = (s->detection ? s->adj_knee_start : s->lin_knee_start);
            detected = s->lin_slope > detector;
        }

        if (s->lin_slope > 0.0 && detected)
            gain = output_gain(s->lin_slope, s->ratio, s->thres, s->knee,
                               s->knee_start, s->knee_stop,
                               s->compressed_knee_start,
                               s->compressed_knee_stop,
                               s->detection, s->mode);

        for (c = 0; c < inlink->channels; c++)
            dst[c] = src[c] * level_in * (gain * makeup * mix + (1. - mix));

        src += inlink->channels;
        dst += inlink->channels;
        scsrc += sclink->channels;
    }
}

static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
                           char *res, int res_len, int flags)
{
    int ret;

    ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
    if (ret < 0)
        return ret;

    compressor_config_output(ctx->outputs[0]);

    return 0;
}

#if CONFIG_SIDECHAINCOMPRESS_FILTER
static int activate(AVFilterContext *ctx)
{
    SidechainCompressContext *s = ctx->priv;
    AVFrame *out = NULL, *in[2] = { NULL };
    int ret, i, nb_samples;
    double *dst;

    FF_FILTER_FORWARD_STATUS_BACK_ALL(ctx->outputs[0], ctx);
    if ((ret = ff_inlink_consume_frame(ctx->inputs[0], &in[0])) > 0) {
        av_audio_fifo_write(s->fifo[0], (void **)in[0]->extended_data,
                            in[0]->nb_samples);
        av_frame_free(&in[0]);
    }
    if (ret < 0)
        return ret;
    if ((ret = ff_inlink_consume_frame(ctx->inputs[1], &in[1])) > 0) {
        av_audio_fifo_write(s->fifo[1], (void **)in[1]->extended_data,
                            in[1]->nb_samples);
        av_frame_free(&in[1]);
    }
    if (ret < 0)
        return ret;

    nb_samples = FFMIN(av_audio_fifo_size(s->fifo[0]), av_audio_fifo_size(s->fifo[1]));
    if (nb_samples) {
        out = ff_get_audio_buffer(ctx->outputs[0], nb_samples);
        if (!out)
            return AVERROR(ENOMEM);
        for (i = 0; i < 2; i++) {
            in[i] = ff_get_audio_buffer(ctx->inputs[i], nb_samples);
            if (!in[i]) {
                av_frame_free(&in[0]);
                av_frame_free(&in[1]);
                av_frame_free(&out);
                return AVERROR(ENOMEM);
            }
            av_audio_fifo_read(s->fifo[i], (void **)in[i]->data, nb_samples);
        }

        dst = (double *)out->data[0];
        out->pts = s->pts;
        s->pts += av_rescale_q(nb_samples, (AVRational){1, ctx->outputs[0]->sample_rate}, ctx->outputs[0]->time_base);

        compressor(s, (double *)in[0]->data[0], dst,
                   (double *)in[1]->data[0], nb_samples,
                   s->level_in, s->level_sc,
                   ctx->inputs[0], ctx->inputs[1]);

        av_frame_free(&in[0]);
        av_frame_free(&in[1]);

        ret = ff_filter_frame(ctx->outputs[0], out);
        if (ret < 0)
            return ret;
    }
    FF_FILTER_FORWARD_STATUS(ctx->inputs[0], ctx->outputs[0]);
    FF_FILTER_FORWARD_STATUS(ctx->inputs[1], ctx->outputs[0]);
    if (ff_outlink_frame_wanted(ctx->outputs[0])) {
        if (!av_audio_fifo_size(s->fifo[0]))
            ff_inlink_request_frame(ctx->inputs[0]);
        if (!av_audio_fifo_size(s->fifo[1]))
            ff_inlink_request_frame(ctx->inputs[1]);
    }
    return 0;
}

static int query_formats(AVFilterContext *ctx)
{
    AVFilterFormats *formats;
    AVFilterChannelLayouts *layouts = NULL;
    static const enum AVSampleFormat sample_fmts[] = {
        AV_SAMPLE_FMT_DBL,
        AV_SAMPLE_FMT_NONE
    };
    int ret, i;

    if (!ctx->inputs[0]->incfg.channel_layouts ||
        !ctx->inputs[0]->incfg.channel_layouts->nb_channel_layouts) {
        av_log(ctx, AV_LOG_WARNING,
               "No channel layout for input 1\n");
            return AVERROR(EAGAIN);
    }

    if ((ret = ff_add_channel_layout(&layouts, ctx->inputs[0]->incfg.channel_layouts->channel_layouts[0])) < 0 ||
        (ret = ff_channel_layouts_ref(layouts, &ctx->outputs[0]->incfg.channel_layouts)) < 0)
        return ret;

    for (i = 0; i < 2; i++) {
        layouts = ff_all_channel_counts();
        if ((ret = ff_channel_layouts_ref(layouts, &ctx->inputs[i]->outcfg.channel_layouts)) < 0)
            return ret;
    }

    formats = ff_make_format_list(sample_fmts);
    if ((ret = ff_set_common_formats(ctx, formats)) < 0)
        return ret;

    formats = ff_all_samplerates();
    return ff_set_common_samplerates(ctx, formats);
}

static int config_output(AVFilterLink *outlink)
{
    AVFilterContext *ctx = outlink->src;
    SidechainCompressContext *s = ctx->priv;

    if (ctx->inputs[0]->sample_rate != ctx->inputs[1]->sample_rate) {
        av_log(ctx, AV_LOG_ERROR,
               "Inputs must have the same sample rate "
               "%d for in0 vs %d for in1\n",
               ctx->inputs[0]->sample_rate, ctx->inputs[1]->sample_rate);
        return AVERROR(EINVAL);
    }

    outlink->sample_rate = ctx->inputs[0]->sample_rate;
    outlink->time_base   = ctx->inputs[0]->time_base;
    outlink->channel_layout = ctx->inputs[0]->channel_layout;
    outlink->channels = ctx->inputs[0]->channels;

    s->fifo[0] = av_audio_fifo_alloc(ctx->inputs[0]->format, ctx->inputs[0]->channels, 1024);
    s->fifo[1] = av_audio_fifo_alloc(ctx->inputs[1]->format, ctx->inputs[1]->channels, 1024);
    if (!s->fifo[0] || !s->fifo[1])
        return AVERROR(ENOMEM);

    compressor_config_output(outlink);

    return 0;
}

static av_cold void uninit(AVFilterContext *ctx)
{
    SidechainCompressContext *s = ctx->priv;

    av_audio_fifo_free(s->fifo[0]);
    av_audio_fifo_free(s->fifo[1]);
}

static const AVFilterPad sidechaincompress_inputs[] = {
    {
        .name           = "main",
        .type           = AVMEDIA_TYPE_AUDIO,
    },{
        .name           = "sidechain",
        .type           = AVMEDIA_TYPE_AUDIO,
    },
    { NULL }
};

static const AVFilterPad sidechaincompress_outputs[] = {
    {
        .name          = "default",
        .type          = AVMEDIA_TYPE_AUDIO,
        .config_props  = config_output,
    },
    { NULL }
};

AVFilter ff_af_sidechaincompress = {
    .name           = "sidechaincompress",
    .description    = NULL_IF_CONFIG_SMALL("Sidechain compressor."),
    .priv_size      = sizeof(SidechainCompressContext),
    .priv_class     = &sidechaincompress_class,
    .query_formats  = query_formats,
    .activate       = activate,
    .uninit         = uninit,
    .inputs         = sidechaincompress_inputs,
    .outputs        = sidechaincompress_outputs,
    .process_command = process_command,
};
#endif  /* CONFIG_SIDECHAINCOMPRESS_FILTER */

#if CONFIG_ACOMPRESSOR_FILTER
static int acompressor_filter_frame(AVFilterLink *inlink, AVFrame *in)
{
    const double *src = (const double *)in->data[0];
    AVFilterContext *ctx = inlink->dst;
    SidechainCompressContext *s = ctx->priv;
    AVFilterLink *outlink = ctx->outputs[0];
    AVFrame *out;
    double *dst;

    if (av_frame_is_writable(in)) {
        out = in;
    } else {
        out = ff_get_audio_buffer(outlink, in->nb_samples);
        if (!out) {
            av_frame_free(&in);
            return AVERROR(ENOMEM);
        }
        av_frame_copy_props(out, in);
    }
    dst = (double *)out->data[0];

    compressor(s, src, dst, src, in->nb_samples,
               s->level_in, s->level_in,
               inlink, inlink);

    if (out != in)
        av_frame_free(&in);
    return ff_filter_frame(outlink, out);
}

static int acompressor_query_formats(AVFilterContext *ctx)
{
    AVFilterFormats *formats;
    AVFilterChannelLayouts *layouts;
    static const enum AVSampleFormat sample_fmts[] = {
        AV_SAMPLE_FMT_DBL,
        AV_SAMPLE_FMT_NONE
    };
    int ret;

    layouts = ff_all_channel_counts();
    if (!layouts)
        return AVERROR(ENOMEM);
    ret = ff_set_common_channel_layouts(ctx, layouts);
    if (ret < 0)
        return ret;

    formats = ff_make_format_list(sample_fmts);
    if (!formats)
        return AVERROR(ENOMEM);
    ret = ff_set_common_formats(ctx, formats);
    if (ret < 0)
        return ret;

    formats = ff_all_samplerates();
    if (!formats)
        return AVERROR(ENOMEM);
    return ff_set_common_samplerates(ctx, formats);
}

#define acompressor_options options
AVFILTER_DEFINE_CLASS(acompressor);

static const AVFilterPad acompressor_inputs[] = {
    {
        .name           = "default",
        .type           = AVMEDIA_TYPE_AUDIO,
        .filter_frame   = acompressor_filter_frame,
    },
    { NULL }
};

static const AVFilterPad acompressor_outputs[] = {
    {
        .name          = "default",
        .type          = AVMEDIA_TYPE_AUDIO,
        .config_props  = compressor_config_output,
    },
    { NULL }
};

AVFilter ff_af_acompressor = {
    .name           = "acompressor",
    .description    = NULL_IF_CONFIG_SMALL("Audio compressor."),
    .priv_size      = sizeof(SidechainCompressContext),
    .priv_class     = &acompressor_class,
    .query_formats  = acompressor_query_formats,
    .inputs         = acompressor_inputs,
    .outputs        = acompressor_outputs,
    .process_command = process_command,
};
#endif  /* CONFIG_ACOMPRESSOR_FILTER */


Generated by: GCOVR (Version 4.2)

Line	Branch	Exec	Source
1			/*
2			* Copyright (C) 2001-2010 Krzysztof Foltman, Markus Schmidt, Thor Harald Johansen and others
3			* Copyright (c) 2015 Paul B Mahol
4			*
5			* This file is part of FFmpeg.
6			*
7			* FFmpeg is free software; you can redistribute it and/or
8			* modify it under the terms of the GNU Lesser General Public
9			* License as published by the Free Software Foundation; either
10			* version 2.1 of the License, or (at your option) any later version.
11			*
12			* FFmpeg is distributed in the hope that it will be useful,
13			* but WITHOUT ANY WARRANTY; without even the implied warranty of
14			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15			* Lesser General Public License for more details.
16			*
17			* You should have received a copy of the GNU Lesser General Public
18			* License along with FFmpeg; if not, write to the Free Software
19			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20			*/
21
22			/**
23			* @file
24			* Audio (Sidechain) Compressor filter
25			*/
26
27			#include "libavutil/audio_fifo.h"
28			#include "libavutil/avassert.h"
29			#include "libavutil/channel_layout.h"
30			#include "libavutil/common.h"
31			#include "libavutil/opt.h"
32
33			#include "audio.h"
34			#include "avfilter.h"
35			#include "filters.h"
36			#include "formats.h"
37			#include "hermite.h"
38			#include "internal.h"
39
40			typedef struct SidechainCompressContext {
41			const AVClass *class;
42
43			double level_in;
44			double level_sc;
45			double attack, attack_coeff;
46			double release, release_coeff;
47			double lin_slope;
48			double ratio;
49			double threshold;
50			double makeup;
51			double mix;
52			double thres;
53			double knee;
54			double knee_start;
55			double knee_stop;
56			double lin_knee_start;
57			double lin_knee_stop;
58			double adj_knee_start;
59			double adj_knee_stop;
60			double compressed_knee_start;
61			double compressed_knee_stop;
62			int link;
63			int detection;
64			int mode;
65
66			AVAudioFifo *fifo[2];
67			int64_t pts;
68			} SidechainCompressContext;
69
70			#define OFFSET(x) offsetof(SidechainCompressContext, x)
71			#define A AV_OPT_FLAG_AUDIO_PARAM
72			#define F AV_OPT_FLAG_FILTERING_PARAM
73			#define R AV_OPT_FLAG_RUNTIME_PARAM
74
75			static const AVOption options[] = {
76			{ "level_in", "set input gain", OFFSET(level_in), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, A\|F\|R },
77			{ "mode", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, A\|F\|R, "mode" },
78			{ "downward",0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, A\|F\|R, "mode" },
79			{ "upward", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, A\|F\|R, "mode" },
80			{ "threshold", "set threshold", OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl=0.125}, 0.000976563, 1, A\|F\|R },
81			{ "ratio", "set ratio", OFFSET(ratio), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 1, 20, A\|F\|R },
82			{ "attack", "set attack", OFFSET(attack), AV_OPT_TYPE_DOUBLE, {.dbl=20}, 0.01, 2000, A\|F\|R },
83			{ "release", "set release", OFFSET(release), AV_OPT_TYPE_DOUBLE, {.dbl=250}, 0.01, 9000, A\|F\|R },
84			{ "makeup", "set make up gain", OFFSET(makeup), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 1, 64, A\|F\|R },
85			{ "knee", "set knee", OFFSET(knee), AV_OPT_TYPE_DOUBLE, {.dbl=2.82843}, 1, 8, A\|F\|R },
86			{ "link", "set link type", OFFSET(link), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, A\|F\|R, "link" },
87			{ "average", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, A\|F\|R, "link" },
88			{ "maximum", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, A\|F\|R, "link" },
89			{ "detection", "set detection", OFFSET(detection), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, A\|F\|R, "detection" },
90			{ "peak", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, A\|F\|R, "detection" },
91			{ "rms", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, A\|F\|R, "detection" },
92			{ "level_sc", "set sidechain gain", OFFSET(level_sc), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, A\|F\|R },
93			{ "mix", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, A\|F\|R },
94			{ NULL }
95			};
96
97			#define sidechaincompress_options options
98			AVFILTER_DEFINE_CLASS(sidechaincompress);
99
100			// A fake infinity value (because real infinity may break some hosts)
101			#define FAKE_INFINITY (65536.0 * 65536.0)
102
103			// Check for infinity (with appropriate-ish tolerance)
104			#define IS_FAKE_INFINITY(value) (fabs(value-FAKE_INFINITY) < 1.0)
105
106			static double output_gain(double lin_slope, double ratio, double thres,
107			double knee, double knee_start, double knee_stop,
108			double compressed_knee_start,
109			double compressed_knee_stop,
110			int detection, int mode)
111			{
112			double slope = log(lin_slope);
113			double gain = 0.0;
114			double delta = 0.0;
115
116			if (detection)
117			slope *= 0.5;
118
119			if (IS_FAKE_INFINITY(ratio)) {
120			gain = thres;
121			delta = 0.0;
122			} else {
123			gain = (slope - thres) / ratio + thres;
124			delta = 1.0 / ratio;
125			}
126
127			if (mode) {
128			if (knee > 1.0 && slope > knee_start)
129			gain = hermite_interpolation(slope, knee_stop, knee_start,
130			knee_stop, compressed_knee_start,
131			1.0, delta);
132			} else {
133			if (knee > 1.0 && slope < knee_stop)
134			gain = hermite_interpolation(slope, knee_start, knee_stop,
135			knee_start, compressed_knee_stop,
136			1.0, delta);
137			}
138
139			return exp(gain - slope);
140			}
141
142			static int compressor_config_output(AVFilterLink *outlink)
143			{
144			AVFilterContext *ctx = outlink->src;
145			SidechainCompressContext *s = ctx->priv;
146
147			s->thres = log(s->threshold);
148			s->lin_knee_start = s->threshold / sqrt(s->knee);
149			s->lin_knee_stop = s->threshold * sqrt(s->knee);
150			s->adj_knee_start = s->lin_knee_start * s->lin_knee_start;
151			s->adj_knee_stop = s->lin_knee_stop * s->lin_knee_stop;
152			s->knee_start = log(s->lin_knee_start);
153			s->knee_stop = log(s->lin_knee_stop);
154			s->compressed_knee_start = (s->knee_start - s->thres) / s->ratio + s->thres;
155			s->compressed_knee_stop = (s->knee_stop - s->thres) / s->ratio + s->thres;
156
157			s->attack_coeff = FFMIN(1., 1. / (s->attack * outlink->sample_rate / 4000.));
158			s->release_coeff = FFMIN(1., 1. / (s->release * outlink->sample_rate / 4000.));
159
160			return 0;
161			}
162
163			static void compressor(SidechainCompressContext *s,
164			const double src, double dst, const double *scsrc, int nb_samples,
165			double level_in, double level_sc,
166			AVFilterLink inlink, AVFilterLink sclink)
167			{
168			const double makeup = s->makeup;
169			const double mix = s->mix;
170			int i, c;
171
172			for (i = 0; i < nb_samples; i++) {
173			double abs_sample, gain = 1.0;
174			double detector;
175			int detected;
176
177			abs_sample = fabs(scsrc[0] * level_sc);
178
179			if (s->link == 1) {
180			for (c = 1; c < sclink->channels; c++)
181			abs_sample = FFMAX(fabs(scsrc[c] * level_sc), abs_sample);
182			} else {
183			for (c = 1; c < sclink->channels; c++)
184			abs_sample += fabs(scsrc[c] * level_sc);
185
186			abs_sample /= sclink->channels;
187			}
188
189			if (s->detection)
190			abs_sample *= abs_sample;
191
192			s->lin_slope += (abs_sample - s->lin_slope) * (abs_sample > s->lin_slope ? s->attack_coeff : s->release_coeff);
193
194			if (s->mode) {
195			detector = (s->detection ? s->adj_knee_stop : s->lin_knee_stop);
196			detected = s->lin_slope < detector;
197			} else {
198			detector = (s->detection ? s->adj_knee_start : s->lin_knee_start);
199			detected = s->lin_slope > detector;
200			}
201
202			if (s->lin_slope > 0.0 && detected)
203			gain = output_gain(s->lin_slope, s->ratio, s->thres, s->knee,
204			s->knee_start, s->knee_stop,
205			s->compressed_knee_start,
206			s->compressed_knee_stop,
207			s->detection, s->mode);
208
209			for (c = 0; c < inlink->channels; c++)
210			dst[c] = src[c] * level_in * (gain * makeup * mix + (1. - mix));
211
212			src += inlink->channels;
213			dst += inlink->channels;
214			scsrc += sclink->channels;
215			}
216			}
217
218			static int process_command(AVFilterContext ctx, const char cmd, const char *args,
219			char *res, int res_len, int flags)
220			{
221			int ret;
222
223			ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
224			if (ret < 0)
225			return ret;
226
227			compressor_config_output(ctx->outputs[0]);
228
229			return 0;
230			}
231
232			#if CONFIG_SIDECHAINCOMPRESS_FILTER
233			static int activate(AVFilterContext *ctx)
234			{
235			SidechainCompressContext *s = ctx->priv;
236			AVFrame out = NULL, in[2] = { NULL };
237			int ret, i, nb_samples;
238			double *dst;
239
240			FF_FILTER_FORWARD_STATUS_BACK_ALL(ctx->outputs[0], ctx);
241			if ((ret = ff_inlink_consume_frame(ctx->inputs[0], &in[0])) > 0) {
242			av_audio_fifo_write(s->fifo[0], (void **)in[0]->extended_data,
243			in[0]->nb_samples);
244			av_frame_free(&in[0]);
245			}
246			if (ret < 0)
247			return ret;
248			if ((ret = ff_inlink_consume_frame(ctx->inputs[1], &in[1])) > 0) {
249			av_audio_fifo_write(s->fifo[1], (void **)in[1]->extended_data,
250			in[1]->nb_samples);
251			av_frame_free(&in[1]);
252			}
253			if (ret < 0)
254			return ret;
255
256			nb_samples = FFMIN(av_audio_fifo_size(s->fifo[0]), av_audio_fifo_size(s->fifo[1]));
257			if (nb_samples) {
258			out = ff_get_audio_buffer(ctx->outputs[0], nb_samples);
259			if (!out)
260			return AVERROR(ENOMEM);
261			for (i = 0; i < 2; i++) {
262			in[i] = ff_get_audio_buffer(ctx->inputs[i], nb_samples);
263			if (!in[i]) {
264			av_frame_free(&in[0]);
265			av_frame_free(&in[1]);
266			av_frame_free(&out);
267			return AVERROR(ENOMEM);
268			}
269			av_audio_fifo_read(s->fifo[i], (void **)in[i]->data, nb_samples);
270			}
271
272			dst = (double *)out->data[0];
273			out->pts = s->pts;
274			s->pts += av_rescale_q(nb_samples, (AVRational){1, ctx->outputs[0]->sample_rate}, ctx->outputs[0]->time_base);
275
276			compressor(s, (double *)in[0]->data[0], dst,
277			(double *)in[1]->data[0], nb_samples,
278			s->level_in, s->level_sc,
279			ctx->inputs[0], ctx->inputs[1]);
280
281			av_frame_free(&in[0]);
282			av_frame_free(&in[1]);
283
284			ret = ff_filter_frame(ctx->outputs[0], out);
285			if (ret < 0)
286			return ret;
287			}
288			FF_FILTER_FORWARD_STATUS(ctx->inputs[0], ctx->outputs[0]);
289			FF_FILTER_FORWARD_STATUS(ctx->inputs[1], ctx->outputs[0]);
290			if (ff_outlink_frame_wanted(ctx->outputs[0])) {
291			if (!av_audio_fifo_size(s->fifo[0]))
292			ff_inlink_request_frame(ctx->inputs[0]);
293			if (!av_audio_fifo_size(s->fifo[1]))
294			ff_inlink_request_frame(ctx->inputs[1]);
295			}
296			return 0;
297			}
298
299			static int query_formats(AVFilterContext *ctx)
300			{
301			AVFilterFormats *formats;
302			AVFilterChannelLayouts *layouts = NULL;
303			static const enum AVSampleFormat sample_fmts[] = {
304			AV_SAMPLE_FMT_DBL,
305			AV_SAMPLE_FMT_NONE
306			};
307			int ret, i;
308
309			if (!ctx->inputs[0]->incfg.channel_layouts \|\|
310			!ctx->inputs[0]->incfg.channel_layouts->nb_channel_layouts) {
311			av_log(ctx, AV_LOG_WARNING,
312			"No channel layout for input 1\n");
313			return AVERROR(EAGAIN);
314			}
315
316			if ((ret = ff_add_channel_layout(&layouts, ctx->inputs[0]->incfg.channel_layouts->channel_layouts[0])) < 0 \|\|
317			(ret = ff_channel_layouts_ref(layouts, &ctx->outputs[0]->incfg.channel_layouts)) < 0)
318			return ret;
319
320			for (i = 0; i < 2; i++) {
321			layouts = ff_all_channel_counts();
322			if ((ret = ff_channel_layouts_ref(layouts, &ctx->inputs[i]->outcfg.channel_layouts)) < 0)
323			return ret;
324			}
325
326			formats = ff_make_format_list(sample_fmts);
327			if ((ret = ff_set_common_formats(ctx, formats)) < 0)
328			return ret;
329
330			formats = ff_all_samplerates();
331			return ff_set_common_samplerates(ctx, formats);
332			}
333
334			static int config_output(AVFilterLink *outlink)
335			{
336			AVFilterContext *ctx = outlink->src;
337			SidechainCompressContext *s = ctx->priv;
338
339			if (ctx->inputs[0]->sample_rate != ctx->inputs[1]->sample_rate) {
340			av_log(ctx, AV_LOG_ERROR,
341			"Inputs must have the same sample rate "
342			"%d for in0 vs %d for in1\n",
343			ctx->inputs[0]->sample_rate, ctx->inputs[1]->sample_rate);
344			return AVERROR(EINVAL);
345			}
346
347			outlink->sample_rate = ctx->inputs[0]->sample_rate;
348			outlink->time_base = ctx->inputs[0]->time_base;
349			outlink->channel_layout = ctx->inputs[0]->channel_layout;
350			outlink->channels = ctx->inputs[0]->channels;
351
352			s->fifo[0] = av_audio_fifo_alloc(ctx->inputs[0]->format, ctx->inputs[0]->channels, 1024);
353			s->fifo[1] = av_audio_fifo_alloc(ctx->inputs[1]->format, ctx->inputs[1]->channels, 1024);
354			if (!s->fifo[0] \|\| !s->fifo[1])
355			return AVERROR(ENOMEM);
356
357			compressor_config_output(outlink);
358
359			return 0;
360			}
361
362			static av_cold void uninit(AVFilterContext *ctx)
363			{
364			SidechainCompressContext *s = ctx->priv;
365
366			av_audio_fifo_free(s->fifo[0]);
367			av_audio_fifo_free(s->fifo[1]);
368			}
369
370			static const AVFilterPad sidechaincompress_inputs[] = {
371			{
372			.name = "main",
373			.type = AVMEDIA_TYPE_AUDIO,
374			},{
375			.name = "sidechain",
376			.type = AVMEDIA_TYPE_AUDIO,
377			},
378			{ NULL }
379			};
380
381			static const AVFilterPad sidechaincompress_outputs[] = {
382			{
383			.name = "default",
384			.type = AVMEDIA_TYPE_AUDIO,
385			.config_props = config_output,
386			},
387			{ NULL }
388			};
389
390			AVFilter ff_af_sidechaincompress = {
391			.name = "sidechaincompress",
392			.description = NULL_IF_CONFIG_SMALL("Sidechain compressor."),
393			.priv_size = sizeof(SidechainCompressContext),
394			.priv_class = &sidechaincompress_class,
395			.query_formats = query_formats,
396			.activate = activate,
397			.uninit = uninit,
398			.inputs = sidechaincompress_inputs,
399			.outputs = sidechaincompress_outputs,
400			.process_command = process_command,
401			};
402			#endif /* CONFIG_SIDECHAINCOMPRESS_FILTER */
403
404			#if CONFIG_ACOMPRESSOR_FILTER
405			static int acompressor_filter_frame(AVFilterLink inlink, AVFrame in)
406			{
407			const double src = (const double )in->data[0];
408			AVFilterContext *ctx = inlink->dst;
409			SidechainCompressContext *s = ctx->priv;
410			AVFilterLink *outlink = ctx->outputs[0];
411			AVFrame *out;
412			double *dst;
413
414			if (av_frame_is_writable(in)) {
415			out = in;
416			} else {
417			out = ff_get_audio_buffer(outlink, in->nb_samples);
418			if (!out) {
419			av_frame_free(&in);
420			return AVERROR(ENOMEM);
421			}
422			av_frame_copy_props(out, in);
423			}
424			dst = (double *)out->data[0];
425
426			compressor(s, src, dst, src, in->nb_samples,
427			s->level_in, s->level_in,
428			inlink, inlink);
429
430			if (out != in)
431			av_frame_free(&in);
432			return ff_filter_frame(outlink, out);
433			}
434
435			static int acompressor_query_formats(AVFilterContext *ctx)
436			{
437			AVFilterFormats *formats;
438			AVFilterChannelLayouts *layouts;
439			static const enum AVSampleFormat sample_fmts[] = {
440			AV_SAMPLE_FMT_DBL,
441			AV_SAMPLE_FMT_NONE
442			};
443			int ret;
444
445			layouts = ff_all_channel_counts();
446			if (!layouts)
447			return AVERROR(ENOMEM);
448			ret = ff_set_common_channel_layouts(ctx, layouts);
449			if (ret < 0)
450			return ret;
451
452			formats = ff_make_format_list(sample_fmts);
453			if (!formats)
454			return AVERROR(ENOMEM);
455			ret = ff_set_common_formats(ctx, formats);
456			if (ret < 0)
457			return ret;
458
459			formats = ff_all_samplerates();
460			if (!formats)
461			return AVERROR(ENOMEM);
462			return ff_set_common_samplerates(ctx, formats);
463			}
464
465			#define acompressor_options options
466			AVFILTER_DEFINE_CLASS(acompressor);
467
468			static const AVFilterPad acompressor_inputs[] = {
469			{
470			.name = "default",
471			.type = AVMEDIA_TYPE_AUDIO,
472			.filter_frame = acompressor_filter_frame,
473			},
474			{ NULL }
475			};
476
477			static const AVFilterPad acompressor_outputs[] = {
478			{
479			.name = "default",
480			.type = AVMEDIA_TYPE_AUDIO,
481			.config_props = compressor_config_output,
482			},
483			{ NULL }
484			};
485
486			AVFilter ff_af_acompressor = {
487			.name = "acompressor",
488			.description = NULL_IF_CONFIG_SMALL("Audio compressor."),
489			.priv_size = sizeof(SidechainCompressContext),
490			.priv_class = &acompressor_class,
491			.query_formats = acompressor_query_formats,
492			.inputs = acompressor_inputs,
493			.outputs = acompressor_outputs,
494			.process_command = process_command,
495			};
496			#endif /* CONFIG_ACOMPRESSOR_FILTER */