GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavfilter/af_apulsator.c Lines: 0 98 0.0 %
Date: 2020-08-14 10:39:37 Branches: 0 50 0.0 %

Line Branch Exec Source
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/*
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 * Copyright (c) 2001-2010 Krzysztof Foltman, Markus Schmidt, Thor Harald Johansen and others
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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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#include "libavutil/avassert.h"
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#include "libavutil/opt.h"
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#include "avfilter.h"
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#include "internal.h"
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#include "audio.h"
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enum PulsatorModes { SINE, TRIANGLE, SQUARE, SAWUP, SAWDOWN, NB_MODES };
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enum PulsatorTimings { UNIT_BPM, UNIT_MS, UNIT_HZ, NB_TIMINGS };
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typedef struct SimpleLFO {
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    double phase;
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    double freq;
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    double offset;
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    double amount;
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    double pwidth;
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    int mode;
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    int srate;
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} SimpleLFO;
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typedef struct AudioPulsatorContext {
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    const AVClass *class;
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    int mode;
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    double level_in;
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    double level_out;
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    double amount;
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    double offset_l;
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    double offset_r;
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    double pwidth;
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    double bpm;
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    double hertz;
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    int ms;
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    int timing;
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    SimpleLFO lfoL, lfoR;
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} AudioPulsatorContext;
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#define OFFSET(x) offsetof(AudioPulsatorContext, x)
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#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption apulsator_options[] = {
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    { "level_in",   "set input gain", OFFSET(level_in),  AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, FLAGS, },
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    { "level_out", "set output gain", OFFSET(level_out), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, FLAGS, },
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    { "mode",             "set mode", OFFSET(mode),      AV_OPT_TYPE_INT,    {.i64=SINE}, SINE,   NB_MODES-1, FLAGS, "mode" },
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    {   "sine",                 NULL, 0,                 AV_OPT_TYPE_CONST,  {.i64=SINE},    0,            0, FLAGS, "mode" },
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    {   "triangle",             NULL, 0,                 AV_OPT_TYPE_CONST,  {.i64=TRIANGLE},0,            0, FLAGS, "mode" },
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    {   "square",               NULL, 0,                 AV_OPT_TYPE_CONST,  {.i64=SQUARE},  0,            0, FLAGS, "mode" },
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    {   "sawup",                NULL, 0,                 AV_OPT_TYPE_CONST,  {.i64=SAWUP},   0,            0, FLAGS, "mode" },
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    {   "sawdown",              NULL, 0,                 AV_OPT_TYPE_CONST,  {.i64=SAWDOWN}, 0,            0, FLAGS, "mode" },
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    { "amount",     "set modulation", OFFSET(amount),    AV_OPT_TYPE_DOUBLE, {.dbl=1},       0,            1, FLAGS },
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    { "offset_l",     "set offset L", OFFSET(offset_l),  AV_OPT_TYPE_DOUBLE, {.dbl=0},       0,            1, FLAGS },
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    { "offset_r",     "set offset R", OFFSET(offset_r),  AV_OPT_TYPE_DOUBLE, {.dbl=.5},      0,            1, FLAGS },
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    { "width",     "set pulse width", OFFSET(pwidth),    AV_OPT_TYPE_DOUBLE, {.dbl=1},       0,            2, FLAGS },
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    { "timing",         "set timing", OFFSET(timing),    AV_OPT_TYPE_INT,    {.i64=2},       0, NB_TIMINGS-1, FLAGS, "timing" },
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    {   "bpm",                  NULL, 0,                 AV_OPT_TYPE_CONST,  {.i64=UNIT_BPM},  0,          0, FLAGS, "timing" },
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    {   "ms",                   NULL, 0,                 AV_OPT_TYPE_CONST,  {.i64=UNIT_MS},   0,          0, FLAGS, "timing" },
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    {   "hz",                   NULL, 0,                 AV_OPT_TYPE_CONST,  {.i64=UNIT_HZ},   0,          0, FLAGS, "timing" },
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    { "bpm",               "set BPM", OFFSET(bpm),       AV_OPT_TYPE_DOUBLE, {.dbl=120},    30,          300, FLAGS },
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    { "ms",                 "set ms", OFFSET(ms),        AV_OPT_TYPE_INT,    {.i64=500},    10,         2000, FLAGS },
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    { "hz",          "set frequency", OFFSET(hertz),     AV_OPT_TYPE_DOUBLE, {.dbl=2},    0.01,          100, FLAGS },
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    { NULL }
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};
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AVFILTER_DEFINE_CLASS(apulsator);
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static void lfo_advance(SimpleLFO *lfo, unsigned count)
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{
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    lfo->phase = fabs(lfo->phase + count * lfo->freq / lfo->srate);
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    if (lfo->phase >= 1)
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        lfo->phase = fmod(lfo->phase, 1);
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}
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static double lfo_get_value(SimpleLFO *lfo)
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{
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    double phs = FFMIN(100, lfo->phase / FFMIN(1.99, FFMAX(0.01, lfo->pwidth)) + lfo->offset);
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    double val;
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    if (phs > 1)
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        phs = fmod(phs, 1.);
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    switch (lfo->mode) {
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    case SINE:
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        val = sin(phs * 2 * M_PI);
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        break;
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    case TRIANGLE:
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        if (phs > 0.75)
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            val = (phs - 0.75) * 4 - 1;
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        else if (phs > 0.25)
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            val = -4 * phs + 2;
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        else
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            val = phs * 4;
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        break;
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    case SQUARE:
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        val = phs < 0.5 ? -1 : +1;
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        break;
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    case SAWUP:
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        val = phs * 2 - 1;
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        break;
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    case SAWDOWN:
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        val = 1 - phs * 2;
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        break;
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    default: av_assert0(0);
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    }
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    return val * lfo->amount;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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{
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    AVFilterContext *ctx = inlink->dst;
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    AVFilterLink *outlink = ctx->outputs[0];
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    AudioPulsatorContext *s = ctx->priv;
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    const double *src = (const double *)in->data[0];
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    const int nb_samples = in->nb_samples;
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    const double level_out = s->level_out;
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    const double level_in = s->level_in;
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    const double amount = s->amount;
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    AVFrame *out;
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    double *dst;
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    int n;
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    if (av_frame_is_writable(in)) {
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        out = in;
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    } else {
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        out = ff_get_audio_buffer(inlink, in->nb_samples);
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        if (!out) {
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            av_frame_free(&in);
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            return AVERROR(ENOMEM);
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        }
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        av_frame_copy_props(out, in);
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    }
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    dst = (double *)out->data[0];
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    for (n = 0; n < nb_samples; n++) {
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        double outL;
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        double outR;
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        double inL = src[0] * level_in;
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        double inR = src[1] * level_in;
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        double procL = inL;
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        double procR = inR;
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        procL *= lfo_get_value(&s->lfoL) * 0.5 + amount / 2;
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        procR *= lfo_get_value(&s->lfoR) * 0.5 + amount / 2;
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        outL = procL + inL * (1 - amount);
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        outR = procR + inR * (1 - amount);
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        outL *= level_out;
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        outR *= level_out;
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        dst[0] = outL;
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        dst[1] = outR;
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        lfo_advance(&s->lfoL, 1);
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        lfo_advance(&s->lfoR, 1);
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        dst += 2;
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        src += 2;
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    }
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    if (in != out)
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        av_frame_free(&in);
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    return ff_filter_frame(outlink, out);
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}
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static int query_formats(AVFilterContext *ctx)
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{
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    AVFilterChannelLayouts *layout = NULL;
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    AVFilterFormats *formats = NULL;
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    int ret;
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    if ((ret = ff_add_format                 (&formats, AV_SAMPLE_FMT_DBL  )) < 0 ||
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        (ret = ff_set_common_formats         (ctx     , formats            )) < 0 ||
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        (ret = ff_add_channel_layout         (&layout , AV_CH_LAYOUT_STEREO)) < 0 ||
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        (ret = ff_set_common_channel_layouts (ctx     , layout             )) < 0)
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        return ret;
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    formats = ff_all_samplerates();
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    return ff_set_common_samplerates(ctx, formats);
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}
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static int config_input(AVFilterLink *inlink)
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{
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    AVFilterContext *ctx = inlink->dst;
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    AudioPulsatorContext *s = ctx->priv;
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    double freq;
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    switch (s->timing) {
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    case UNIT_BPM:  freq = s->bpm / 60;         break;
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    case UNIT_MS:   freq = 1 / (s->ms / 1000.); break;
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    case UNIT_HZ:   freq = s->hertz;            break;
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    default: av_assert0(0);
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    }
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    s->lfoL.freq   = freq;
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    s->lfoR.freq   = freq;
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    s->lfoL.mode   = s->mode;
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    s->lfoR.mode   = s->mode;
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    s->lfoL.offset = s->offset_l;
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    s->lfoR.offset = s->offset_r;
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    s->lfoL.srate  = inlink->sample_rate;
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    s->lfoR.srate  = inlink->sample_rate;
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    s->lfoL.amount = s->amount;
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    s->lfoR.amount = s->amount;
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    s->lfoL.pwidth = s->pwidth;
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    s->lfoR.pwidth = s->pwidth;
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    return 0;
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}
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static const AVFilterPad inputs[] = {
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    {
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        .name         = "default",
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        .type         = AVMEDIA_TYPE_AUDIO,
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        .config_props = config_input,
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        .filter_frame = filter_frame,
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    },
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    { NULL }
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};
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static const AVFilterPad outputs[] = {
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    {
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        .name = "default",
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        .type = AVMEDIA_TYPE_AUDIO,
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    },
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    { NULL }
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};
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AVFilter ff_af_apulsator = {
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    .name          = "apulsator",
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    .description   = NULL_IF_CONFIG_SMALL("Audio pulsator."),
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    .priv_size     = sizeof(AudioPulsatorContext),
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    .priv_class    = &apulsator_class,
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    .query_formats = query_formats,
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    .inputs        = inputs,
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    .outputs       = outputs,
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};