GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavfilter/asrc_hilbert.c Lines: 0 55 0.0 %
Date: 2020-10-23 17:01:47 Branches: 0 22 0.0 %

Line Branch Exec Source
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/*
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 * Copyright (c) 2018 Paul B Mahol
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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 "internal.h"
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#include "window_func.h"
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typedef struct HilbertContext {
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    const AVClass *class;
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    int sample_rate;
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    int nb_taps;
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    int nb_samples;
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    int win_func;
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    float *taps;
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    int64_t pts;
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} HilbertContext;
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#define OFFSET(x) offsetof(HilbertContext, x)
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#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption hilbert_options[] = {
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    { "sample_rate", "set sample rate",    OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64=44100},  1, INT_MAX,    FLAGS },
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    { "r",           "set sample rate",    OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64=44100},  1, INT_MAX,    FLAGS },
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    { "taps",        "set number of taps", OFFSET(nb_taps),     AV_OPT_TYPE_INT, {.i64=22051}, 11, UINT16_MAX, FLAGS },
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    { "t",           "set number of taps", OFFSET(nb_taps),     AV_OPT_TYPE_INT, {.i64=22051}, 11, UINT16_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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    { "win_func", "set window function", OFFSET(win_func), AV_OPT_TYPE_INT, {.i64=WFUNC_BLACKMAN}, 0, NB_WFUNC-1, FLAGS, "win_func" },
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    { "w",        "set window function", OFFSET(win_func), AV_OPT_TYPE_INT, {.i64=WFUNC_BLACKMAN}, 0, NB_WFUNC-1, FLAGS, "win_func" },
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        { "rect",     "Rectangular",      0, AV_OPT_TYPE_CONST, {.i64=WFUNC_RECT},     0, 0, FLAGS, "win_func" },
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        { "bartlett", "Bartlett",         0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BARTLETT}, 0, 0, FLAGS, "win_func" },
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        { "hanning",  "Hanning",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING},  0, 0, FLAGS, "win_func" },
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        { "hamming",  "Hamming",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HAMMING},  0, 0, FLAGS, "win_func" },
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        { "blackman", "Blackman",         0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BLACKMAN}, 0, 0, FLAGS, "win_func" },
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        { "welch",    "Welch",            0, AV_OPT_TYPE_CONST, {.i64=WFUNC_WELCH},    0, 0, FLAGS, "win_func" },
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        { "flattop",  "Flat-top",         0, AV_OPT_TYPE_CONST, {.i64=WFUNC_FLATTOP},  0, 0, FLAGS, "win_func" },
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        { "bharris",  "Blackman-Harris",  0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHARRIS},  0, 0, FLAGS, "win_func" },
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        { "bnuttall", "Blackman-Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BNUTTALL}, 0, 0, FLAGS, "win_func" },
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        { "bhann",    "Bartlett-Hann",    0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHANN},    0, 0, FLAGS, "win_func" },
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        { "sine",     "Sine",             0, AV_OPT_TYPE_CONST, {.i64=WFUNC_SINE},     0, 0, FLAGS, "win_func" },
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        { "nuttall",  "Nuttall",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_NUTTALL},  0, 0, FLAGS, "win_func" },
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        { "lanczos",  "Lanczos",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_LANCZOS},  0, 0, FLAGS, "win_func" },
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        { "gauss",    "Gauss",            0, AV_OPT_TYPE_CONST, {.i64=WFUNC_GAUSS},    0, 0, FLAGS, "win_func" },
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        { "tukey",    "Tukey",            0, AV_OPT_TYPE_CONST, {.i64=WFUNC_TUKEY},    0, 0, FLAGS, "win_func" },
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        { "dolph",    "Dolph-Chebyshev",  0, AV_OPT_TYPE_CONST, {.i64=WFUNC_DOLPH},    0, 0, FLAGS, "win_func" },
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        { "cauchy",   "Cauchy",           0, AV_OPT_TYPE_CONST, {.i64=WFUNC_CAUCHY},   0, 0, FLAGS, "win_func" },
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        { "parzen",   "Parzen",           0, AV_OPT_TYPE_CONST, {.i64=WFUNC_PARZEN},   0, 0, FLAGS, "win_func" },
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        { "poisson",  "Poisson",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_POISSON},  0, 0, FLAGS, "win_func" },
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        { "bohman" ,  "Bohman",           0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BOHMAN},   0, 0, FLAGS, "win_func" },
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    {NULL}
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};
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AVFILTER_DEFINE_CLASS(hilbert);
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static av_cold int init(AVFilterContext *ctx)
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{
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    HilbertContext *s = ctx->priv;
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    if (!(s->nb_taps & 1)) {
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        av_log(s, AV_LOG_ERROR, "Number of taps %d must be odd length.\n", s->nb_taps);
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        return AVERROR(EINVAL);
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    }
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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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    HilbertContext *s = ctx->priv;
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    av_freep(&s->taps);
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}
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static av_cold int query_formats(AVFilterContext *ctx)
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{
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    HilbertContext *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_FLT,
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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 av_cold int config_props(AVFilterLink *outlink)
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{
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    AVFilterContext *ctx = outlink->src;
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    HilbertContext *s = ctx->priv;
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    float overlap;
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    int i;
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    s->taps = av_malloc_array(s->nb_taps, sizeof(*s->taps));
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    if (!s->taps)
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        return AVERROR(ENOMEM);
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    generate_window_func(s->taps, s->nb_taps, s->win_func, &overlap);
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    for (i = 0; i < s->nb_taps; i++) {
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        int k = -(s->nb_taps / 2) + i;
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        if (k & 1) {
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            float pk = M_PI * k;
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            s->taps[i] *= (1.f - cosf(pk)) / pk;
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        } else {
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            s->taps[i] = 0.f;
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        }
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    }
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    s->pts = 0;
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    return 0;
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}
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static int request_frame(AVFilterLink *outlink)
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{
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    AVFilterContext *ctx = outlink->src;
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    HilbertContext *s = ctx->priv;
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    AVFrame *frame;
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    int nb_samples;
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    nb_samples = FFMIN(s->nb_samples, s->nb_taps - s->pts);
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    if (!nb_samples)
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        return AVERROR_EOF;
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    if (!(frame = ff_get_audio_buffer(outlink, nb_samples)))
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        return AVERROR(ENOMEM);
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    memcpy(frame->data[0], s->taps + s->pts, nb_samples * sizeof(float));
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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 hilbert_outputs[] = {
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    {
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        .name          = "default",
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        .type          = AVMEDIA_TYPE_AUDIO,
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        .request_frame = request_frame,
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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_hilbert = {
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    .name          = "hilbert",
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    .description   = NULL_IF_CONFIG_SMALL("Generate a Hilbert transform FIR coefficients."),
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    .query_formats = query_formats,
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    .init          = init,
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    .uninit        = uninit,
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    .priv_size     = sizeof(HilbertContext),
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    .inputs        = NULL,
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    .outputs       = hilbert_outputs,
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    .priv_class    = &hilbert_class,
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};