GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavfilter/asrc_anoisesrc.c Lines: 0 90 0.0 %
Date: 2020-09-25 23:16:12 Branches: 0 37 0.0 %

Line Branch Exec Source
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/*
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 * Copyright (c) 2015 Kyle Swanson <k@ylo.ph>.
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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 License
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 * 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
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 * GNU 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 License
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 * along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "libavutil/opt.h"
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#include "audio.h"
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#include "avfilter.h"
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#include "filters.h"
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#include "internal.h"
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#include "libavutil/lfg.h"
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#include "libavutil/random_seed.h"
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typedef struct ANoiseSrcContext {
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    const AVClass *class;
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    int sample_rate;
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    double amplitude;
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    int64_t duration;
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    int color;
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    int64_t seed;
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    int nb_samples;
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    int64_t pts;
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    int infinite;
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    double (*filter)(double white, double *buf, double half_amplitude);
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    double buf[7];
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    AVLFG c;
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} ANoiseSrcContext;
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enum NoiseMode {
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    NM_WHITE,
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    NM_PINK,
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    NM_BROWN,
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    NM_BLUE,
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    NM_VIOLET,
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    NM_VELVET,
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    NM_NB
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};
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#define OFFSET(x) offsetof(ANoiseSrcContext, x)
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#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption anoisesrc_options[] = {
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    { "sample_rate",  "set sample rate",  OFFSET(sample_rate),  AV_OPT_TYPE_INT,       {.i64 = 48000},     15,  INT_MAX,    FLAGS },
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    { "r",            "set sample rate",  OFFSET(sample_rate),  AV_OPT_TYPE_INT,       {.i64 = 48000},     15,  INT_MAX,    FLAGS },
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    { "amplitude",    "set amplitude",    OFFSET(amplitude),    AV_OPT_TYPE_DOUBLE,    {.dbl = 1.},        0.,  1.,         FLAGS },
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    { "a",            "set amplitude",    OFFSET(amplitude),    AV_OPT_TYPE_DOUBLE,    {.dbl = 1.},        0.,  1.,         FLAGS },
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    { "duration",     "set duration",     OFFSET(duration),     AV_OPT_TYPE_DURATION,  {.i64 =  0},         0,  INT64_MAX,  FLAGS },
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    { "d",            "set duration",     OFFSET(duration),     AV_OPT_TYPE_DURATION,  {.i64 =  0},         0,  INT64_MAX,  FLAGS },
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    { "color",        "set noise color",  OFFSET(color),        AV_OPT_TYPE_INT,       {.i64 =  0},         0,  NM_NB - 1,  FLAGS, "color" },
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    { "colour",       "set noise color",  OFFSET(color),        AV_OPT_TYPE_INT,       {.i64 =  0},         0,  NM_NB - 1,  FLAGS, "color" },
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    { "c",            "set noise color",  OFFSET(color),        AV_OPT_TYPE_INT,       {.i64 =  0},         0,  NM_NB - 1,  FLAGS, "color" },
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    {     "white",    0,                  0,                    AV_OPT_TYPE_CONST,     {.i64 = NM_WHITE},   0,  0,          FLAGS, "color" },
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    {     "pink",     0,                  0,                    AV_OPT_TYPE_CONST,     {.i64 = NM_PINK},    0,  0,          FLAGS, "color" },
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    {     "brown",    0,                  0,                    AV_OPT_TYPE_CONST,     {.i64 = NM_BROWN},   0,  0,          FLAGS, "color" },
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    {     "blue",     0,                  0,                    AV_OPT_TYPE_CONST,     {.i64 = NM_BLUE},    0,  0,          FLAGS, "color" },
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    {     "violet",   0,                  0,                    AV_OPT_TYPE_CONST,     {.i64 = NM_VIOLET},  0,  0,          FLAGS, "color" },
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    {     "velvet",   0,                  0,                    AV_OPT_TYPE_CONST,     {.i64 = NM_VELVET},  0,  0,          FLAGS, "color" },
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    { "seed",         "set random seed",  OFFSET(seed),         AV_OPT_TYPE_INT64,     {.i64 = -1},        -1,  UINT_MAX,   FLAGS },
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    { "s",            "set random seed",  OFFSET(seed),         AV_OPT_TYPE_INT64,     {.i64 = -1},        -1,  UINT_MAX,   FLAGS },
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    { "nb_samples",   "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 1, INT_MAX, FLAGS },
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    { "n",            "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 1, INT_MAX, FLAGS },
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    {NULL}
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};
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AVFILTER_DEFINE_CLASS(anoisesrc);
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static av_cold int query_formats(AVFilterContext *ctx)
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{
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    ANoiseSrcContext *s = ctx->priv;
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    static const int64_t chlayouts[] = { AV_CH_LAYOUT_MONO, -1 };
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    int sample_rates[] = { s->sample_rate, -1 };
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    static const enum AVSampleFormat sample_fmts[] = {
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        AV_SAMPLE_FMT_DBL,
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        AV_SAMPLE_FMT_NONE
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    };
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    AVFilterFormats *formats;
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    AVFilterChannelLayouts *layouts;
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    int ret;
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    formats = ff_make_format_list(sample_fmts);
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    if (!formats)
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        return AVERROR(ENOMEM);
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    ret = ff_set_common_formats (ctx, formats);
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    if (ret < 0)
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        return ret;
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    layouts = ff_make_format64_list(chlayouts);
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    if (!layouts)
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        return AVERROR(ENOMEM);
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    ret = ff_set_common_channel_layouts(ctx, layouts);
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    if (ret < 0)
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        return ret;
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    formats = ff_make_format_list(sample_rates);
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    if (!formats)
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        return AVERROR(ENOMEM);
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    return ff_set_common_samplerates(ctx, formats);
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}
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static double white_filter(double white, double *buf, double ha)
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{
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    return white;
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}
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static double pink_filter(double white, double *buf, double ha)
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{
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    double pink;
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    /* http://www.musicdsp.org/files/pink.txt */
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    buf[0] = 0.99886 * buf[0] + white * 0.0555179;
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    buf[1] = 0.99332 * buf[1] + white * 0.0750759;
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    buf[2] = 0.96900 * buf[2] + white * 0.1538520;
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    buf[3] = 0.86650 * buf[3] + white * 0.3104856;
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    buf[4] = 0.55000 * buf[4] + white * 0.5329522;
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    buf[5] = -0.7616 * buf[5] - white * 0.0168980;
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    pink = buf[0] + buf[1] + buf[2] + buf[3] + buf[4] + buf[5] + buf[6] + white * 0.5362;
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    buf[6] = white * 0.115926;
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    return pink * 0.11;
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}
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static double blue_filter(double white, double *buf, double ha)
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{
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    double blue;
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    /* Same as pink_filter but subtract the offsets rather than add */
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    buf[0] = 0.0555179 * white - 0.99886 * buf[0];
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    buf[1] = 0.0750759 * white - 0.99332 * buf[1];
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    buf[2] = 0.1538520 * white - 0.96900 * buf[2];
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    buf[3] = 0.3104856 * white - 0.86650 * buf[3];
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    buf[4] = 0.5329522 * white - 0.55000 * buf[4];
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    buf[5] = -0.016898 * white + 0.76160 * buf[5];
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    blue = buf[0] + buf[1] + buf[2] + buf[3] + buf[4] + buf[5] + buf[6] + white * 0.5362;
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    buf[6] = white * 0.115926;
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    return blue * 0.11;
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}
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static double brown_filter(double white, double *buf, double ha)
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{
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    double brown;
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    brown = ((0.02 * white) + buf[0]) / 1.02;
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    buf[0] = brown;
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    return brown * 3.5;
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}
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static double violet_filter(double white, double *buf, double ha)
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{
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    double violet;
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    violet = ((0.02 * white) - buf[0]) / 1.02;
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    buf[0] = violet;
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    return violet * 3.5;
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}
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static double velvet_filter(double white, double *buf, double ha)
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{
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    return 2. * ha * ((white > ha) - (white < -ha));
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}
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static av_cold int config_props(AVFilterLink *outlink)
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{
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    AVFilterContext *ctx = outlink->src;
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    ANoiseSrcContext *s = ctx->priv;
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    if (s->seed == -1)
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        s->seed = av_get_random_seed();
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    av_lfg_init(&s->c, s->seed);
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    if (s->duration == 0)
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        s->infinite = 1;
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    s->duration = av_rescale(s->duration, s->sample_rate, AV_TIME_BASE);
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    switch (s->color) {
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    case NM_WHITE:  s->filter = white_filter;  break;
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    case NM_PINK:   s->filter = pink_filter;   break;
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    case NM_BROWN:  s->filter = brown_filter;  break;
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    case NM_BLUE:   s->filter = blue_filter;   break;
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    case NM_VIOLET: s->filter = violet_filter; break;
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    case NM_VELVET: s->filter = velvet_filter; break;
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    }
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    return 0;
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}
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static int activate(AVFilterContext *ctx)
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{
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    AVFilterLink *outlink = ctx->outputs[0];
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    ANoiseSrcContext *s = ctx->priv;
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    AVFrame *frame;
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    int nb_samples, i;
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    double *dst;
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    if (!ff_outlink_frame_wanted(outlink))
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        return FFERROR_NOT_READY;
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    if (!s->infinite && s->duration <= 0) {
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        ff_outlink_set_status(outlink, AVERROR_EOF, s->pts);
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        return 0;
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    } else if (!s->infinite && s->duration < s->nb_samples) {
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        nb_samples = s->duration;
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    } else {
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        nb_samples = s->nb_samples;
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    }
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    if (!(frame = ff_get_audio_buffer(outlink, nb_samples)))
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        return AVERROR(ENOMEM);
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    dst = (double *)frame->data[0];
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    for (i = 0; i < nb_samples; i++) {
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        double white;
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        white = s->amplitude * ((2 * ((double) av_lfg_get(&s->c) / 0xffffffff)) - 1);
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        dst[i] = s->filter(white, s->buf, s->amplitude * 0.5);
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    }
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    if (!s->infinite)
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        s->duration -= nb_samples;
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    frame->pts = s->pts;
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    s->pts    += nb_samples;
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    return ff_filter_frame(outlink, frame);
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}
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static const AVFilterPad anoisesrc_outputs[] = {
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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_props,
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    },
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    { NULL }
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};
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AVFilter ff_asrc_anoisesrc = {
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    .name          = "anoisesrc",
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    .description   = NULL_IF_CONFIG_SMALL("Generate a noise audio signal."),
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    .query_formats = query_formats,
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    .priv_size     = sizeof(ANoiseSrcContext),
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    .inputs        = NULL,
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    .activate      = activate,
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    .outputs       = anoisesrc_outputs,
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    .priv_class    = &anoisesrc_class,
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};