GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavfilter/af_asoftclip.c Lines: 0 140 0.0 %
Date: 2020-10-23 17:01:47 Branches: 0 93 0.0 %

Line Branch Exec Source
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/*
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 * Copyright (c) 2019 The FFmpeg Project
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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/channel_layout.h"
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#include "libavutil/opt.h"
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#include "avfilter.h"
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#include "audio.h"
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#include "formats.h"
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enum ASoftClipTypes {
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    ASC_TANH,
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    ASC_ATAN,
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    ASC_CUBIC,
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    ASC_EXP,
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    ASC_ALG,
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    ASC_QUINTIC,
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    ASC_SIN,
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    NB_TYPES,
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};
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typedef struct ASoftClipContext {
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    const AVClass *class;
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    int type;
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    double param;
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    void (*filter)(struct ASoftClipContext *s, void **dst, const void **src,
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                   int nb_samples, int channels, int start, int end);
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} ASoftClipContext;
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#define OFFSET(x) offsetof(ASoftClipContext, x)
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#define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
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static const AVOption asoftclip_options[] = {
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    { "type", "set softclip type", OFFSET(type), AV_OPT_TYPE_INT,    {.i64=0},          0, NB_TYPES-1, A, "types" },
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    { "tanh",                NULL,            0, AV_OPT_TYPE_CONST,  {.i64=ASC_TANH},   0,          0, A, "types" },
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    { "atan",                NULL,            0, AV_OPT_TYPE_CONST,  {.i64=ASC_ATAN},   0,          0, A, "types" },
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    { "cubic",               NULL,            0, AV_OPT_TYPE_CONST,  {.i64=ASC_CUBIC},  0,          0, A, "types" },
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    { "exp",                 NULL,            0, AV_OPT_TYPE_CONST,  {.i64=ASC_EXP},    0,          0, A, "types" },
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    { "alg",                 NULL,            0, AV_OPT_TYPE_CONST,  {.i64=ASC_ALG},    0,          0, A, "types" },
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    { "quintic",             NULL,            0, AV_OPT_TYPE_CONST,  {.i64=ASC_QUINTIC},0,          0, A, "types" },
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    { "sin",                 NULL,            0, AV_OPT_TYPE_CONST,  {.i64=ASC_SIN},    0,          0, A, "types" },
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    { "param", "set softclip parameter", OFFSET(param), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.01,        3, A },
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    { NULL }
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};
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AVFILTER_DEFINE_CLASS(asoftclip);
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static int query_formats(AVFilterContext *ctx)
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{
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    AVFilterFormats *formats = NULL;
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    AVFilterChannelLayouts *layouts = NULL;
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    static const enum AVSampleFormat sample_fmts[] = {
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        AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_FLTP,
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        AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_DBLP,
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        AV_SAMPLE_FMT_NONE
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    };
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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_all_channel_counts();
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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_all_samplerates();
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    return ff_set_common_samplerates(ctx, formats);
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}
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#define SQR(x) ((x) * (x))
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static void filter_flt(ASoftClipContext *s,
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                       void **dptr, const void **sptr,
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                       int nb_samples, int channels,
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                       int start, int end)
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{
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    float param = s->param;
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    for (int c = start; c < end; c++) {
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        const float *src = sptr[c];
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        float *dst = dptr[c];
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        switch (s->type) {
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        case ASC_TANH:
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            for (int n = 0; n < nb_samples; n++) {
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                dst[n] = tanhf(src[n] * param);
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            }
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            break;
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        case ASC_ATAN:
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            for (int n = 0; n < nb_samples; n++)
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                dst[n] = 2.f / M_PI * atanf(src[n] * param);
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            break;
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        case ASC_CUBIC:
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            for (int n = 0; n < nb_samples; n++) {
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                if (FFABS(src[n]) >= 1.5f)
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                    dst[n] = FFSIGN(src[n]);
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                else
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                    dst[n] = src[n] - 0.1481f * powf(src[n], 3.f);
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            }
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            break;
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        case ASC_EXP:
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            for (int n = 0; n < nb_samples; n++)
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                dst[n] = 2.f / (1.f + expf(-2.f * src[n])) - 1.;
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            break;
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        case ASC_ALG:
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            for (int n = 0; n < nb_samples; n++)
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                dst[n] = src[n] / (sqrtf(param + src[n] * src[n]));
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            break;
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        case ASC_QUINTIC:
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            for (int n = 0; n < nb_samples; n++) {
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                if (FFABS(src[n]) >= 1.25)
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                    dst[n] = FFSIGN(src[n]);
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                else
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                    dst[n] = src[n] - 0.08192f * powf(src[n], 5.f);
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            }
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            break;
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        case ASC_SIN:
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            for (int n = 0; n < nb_samples; n++) {
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                if (FFABS(src[n]) >= M_PI_2)
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                    dst[n] = FFSIGN(src[n]);
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                else
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                    dst[n] = sinf(src[n]);
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            }
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            break;
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        }
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    }
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}
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static void filter_dbl(ASoftClipContext *s,
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                       void **dptr, const void **sptr,
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                       int nb_samples, int channels,
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                       int start, int end)
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{
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    double param = s->param;
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    for (int c = start; c < end; c++) {
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        const double *src = sptr[c];
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        double *dst = dptr[c];
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        switch (s->type) {
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        case ASC_TANH:
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            for (int n = 0; n < nb_samples; n++) {
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                dst[n] = tanh(src[n] * param);
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            }
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            break;
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        case ASC_ATAN:
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            for (int n = 0; n < nb_samples; n++)
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                dst[n] = 2. / M_PI * atan(src[n] * param);
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            break;
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        case ASC_CUBIC:
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            for (int n = 0; n < nb_samples; n++) {
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                if (FFABS(src[n]) >= 1.5)
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                    dst[n] = FFSIGN(src[n]);
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                else
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                    dst[n] = src[n] - 0.1481 * pow(src[n], 3.);
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            }
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            break;
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        case ASC_EXP:
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            for (int n = 0; n < nb_samples; n++)
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                dst[n] = 2. / (1. + exp(-2. * src[n])) - 1.;
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            break;
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        case ASC_ALG:
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            for (int n = 0; n < nb_samples; n++)
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                dst[n] = src[n] / (sqrt(param + src[n] * src[n]));
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            break;
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        case ASC_QUINTIC:
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            for (int n = 0; n < nb_samples; n++) {
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                if (FFABS(src[n]) >= 1.25)
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                    dst[n] = FFSIGN(src[n]);
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                else
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                    dst[n] = src[n] - 0.08192 * pow(src[n], 5.);
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            }
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            break;
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        case ASC_SIN:
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            for (int n = 0; n < nb_samples; n++) {
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                if (FFABS(src[n]) >= M_PI_2)
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                    dst[n] = FFSIGN(src[n]);
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                else
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                    dst[n] = sin(src[n]);
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            }
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            break;
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        }
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    }
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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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    ASoftClipContext *s = ctx->priv;
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    switch (inlink->format) {
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    case AV_SAMPLE_FMT_FLT:
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    case AV_SAMPLE_FMT_FLTP: s->filter = filter_flt; break;
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    case AV_SAMPLE_FMT_DBL:
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    case AV_SAMPLE_FMT_DBLP: s->filter = filter_dbl; break;
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    }
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    return 0;
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}
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typedef struct ThreadData {
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    AVFrame *in, *out;
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    int nb_samples;
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    int channels;
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} ThreadData;
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static int filter_channels(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
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{
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    ASoftClipContext *s = ctx->priv;
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    ThreadData *td = arg;
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    AVFrame *out = td->out;
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    AVFrame *in = td->in;
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    const int channels = td->channels;
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    const int nb_samples = td->nb_samples;
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    const int start = (channels * jobnr) / nb_jobs;
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    const int end = (channels * (jobnr+1)) / nb_jobs;
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    s->filter(s, (void **)out->extended_data, (const void **)in->extended_data,
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              nb_samples, channels, start, end);
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    return 0;
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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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    int nb_samples, channels;
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    ThreadData td;
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    AVFrame *out;
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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(outlink, 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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    if (av_sample_fmt_is_planar(in->format)) {
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        nb_samples = in->nb_samples;
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        channels = in->channels;
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    } else {
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        nb_samples = in->channels * in->nb_samples;
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        channels = 1;
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    }
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    td.in = in;
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    td.out = out;
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    td.nb_samples = nb_samples;
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    td.channels = channels;
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    ctx->internal->execute(ctx, filter_channels, &td, NULL, FFMIN(channels,
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                                                            ff_filter_get_nb_threads(ctx)));
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    if (out != in)
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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 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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        .filter_frame = filter_frame,
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        .config_props = config_input,
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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_asoftclip = {
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    .name           = "asoftclip",
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    .description    = NULL_IF_CONFIG_SMALL("Audio Soft Clipper."),
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    .query_formats  = query_formats,
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    .priv_size      = sizeof(ASoftClipContext),
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    .priv_class     = &asoftclip_class,
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    .inputs         = inputs,
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    .outputs        = outputs,
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    .process_command = ff_filter_process_command,
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    .flags          = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC |
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                      AVFILTER_FLAG_SLICE_THREADS,
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};