/* * Copyright (c) 2013-2015 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 * fade audio filter */ #include "config_components.h" #include "libavutil/opt.h"#include "audio.h"#include "avfilter.h"#include "filters.h" typedef struct AudioFadeContext {    const AVClass *class;    int type;    int curve, curve2;    int64_t nb_samples;    int64_t start_sample;    int64_t duration;    int64_t start_time;    double silence;    double unity;    int overlap;    int status[2];    int passthrough;    int64_t pts;     void (*fade_samples)(uint8_t **dst, uint8_t * const *src,                         int nb_samples, int channels, int direction,                         int64_t start, int64_t range, int curve,                         double silence, double unity);    void (*scale_samples)(uint8_t **dst, uint8_t * const *src,                          int nb_samples, int channels, double unity);    void (*crossfade_samples)(uint8_t **dst, uint8_t * const *cf0,                              uint8_t * const *cf1,                              int nb_samples, int channels,                              int curve0, int curve1);} AudioFadeContext; enum CurveType { NONE = -1, TRI, QSIN, ESIN, HSIN, LOG, IPAR, QUA, CUB, SQU, CBR, PAR, EXP, IQSIN, IHSIN, DESE, DESI, LOSI, SINC, ISINC, QUAT, QUATR, QSIN2, HSIN2, NB_CURVES }; #define OFFSET(x) offsetof(AudioFadeContext, x)#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM#define TFLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM     static const enum AVSampleFormat sample_fmts[] = {        AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S16P,        AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_S32P,        AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_FLTP,        AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_DBLP,        AV_SAMPLE_FMT_NONE    }; static double fade_gain(int curve, int64_t index, int64_t range, double silence, double unity){#define CUBE(a) ((a)*(a)*(a))    double gain;     gain = av_clipd(1.0 * index / range, 0, 1.0);     switch (curve) {    case QSIN:        gain = sin(gain * M_PI / 2.0);        break;    case IQSIN:        /* 0.6... = 2 / M_PI */        gain = 0.6366197723675814 * asin(gain);        break;    case ESIN:        gain = 1.0 - cos(M_PI / 4.0 * (CUBE(2.0*gain - 1) + 1));        break;    case HSIN:        gain = (1.0 - cos(gain * M_PI)) / 2.0;        break;    case IHSIN:        /* 0.3... = 1 / M_PI */        gain = 0.3183098861837907 * acos(1 - 2 * gain);        break;    case EXP:        /* -11.5... = 5*ln(0.1) */        gain = exp(-11.512925464970227 * (1 - gain));        break;    case LOG:        gain = av_clipd(1 + 0.2 * log10(gain), 0, 1.0);        break;    case PAR:        gain = 1 - sqrt(1 - gain);        break;    case IPAR:        gain = (1 - (1 - gain) * (1 - gain));        break;    case QUA:        gain *= gain;        break;    case CUB:        gain = CUBE(gain);        break;    case SQU:        gain = sqrt(gain);        break;    case CBR:        gain = cbrt(gain);        break;    case DESE:        gain = gain <= 0.5 ? cbrt(2 * gain) / 2: 1 - cbrt(2 * (1 - gain)) / 2;        break;    case DESI:        gain = gain <= 0.5 ? CUBE(2 * gain) / 2: 1 - CUBE(2 * (1 - gain)) / 2;        break;    case LOSI: {                   const double a = 1. / (1. - 0.787) - 1;                   double A = 1. / (1.0 + exp(0 -((gain-0.5) * a * 2.0)));                   double B = 1. / (1.0 + exp(a));                   double C = 1. / (1.0 + exp(0-a));                   gain = (A - B) / (C - B);               }        break;    case SINC:        gain = gain >= 1.0 ? 1.0 : sin(M_PI * (1.0 - gain)) / (M_PI * (1.0 - gain));        break;    case ISINC:        gain = gain <= 0.0 ? 0.0 : 1.0 - sin(M_PI * gain) / (M_PI * gain);        break;    case QUAT:        gain = gain * gain * gain * gain;        break;    case QUATR:        gain = pow(gain, 0.25);        break;    case QSIN2:        gain = sin(gain * M_PI / 2.0) * sin(gain * M_PI / 2.0);        break;    case HSIN2:        gain = pow((1.0 - cos(gain * M_PI)) / 2.0, 2.0);        break;    case NONE:        gain = 1.0;        break;    }     return silence + (unity - silence) * gain;} #define FADE_PLANAR(name, type)                                             \static void fade_samples_## name ##p(uint8_t **dst, uint8_t * const *src,   \                                     int nb_samples, int channels, int dir, \                                     int64_t start, int64_t range,int curve,\                                     double silence, double unity)          \{                                                                           \    int i, c;                                                               \                                                                            \    for (i = 0; i < nb_samples; i++) {                                      \        double gain = fade_gain(curve, start + i * dir,range,silence,unity);\        for (c = 0; c < channels; c++) {                                    \            type *d = (type *)dst[c];                                       \            const type *s = (type *)src[c];                                 \                                                                            \            d[i] = s[i] * gain;                                             \        }                                                                   \    }                                                                       \} #define FADE(name, type)                                                    \static void fade_samples_## name (uint8_t **dst, uint8_t * const *src,      \                                  int nb_samples, int channels, int dir,    \                                  int64_t start, int64_t range, int curve,  \                                  double silence, double unity)             \{                                                                           \    type *d = (type *)dst[0];                                               \    const type *s = (type *)src[0];                                         \    int i, c, k = 0;                                                        \                                                                            \    for (i = 0; i < nb_samples; i++) {                                      \        double gain = fade_gain(curve, start + i * dir,range,silence,unity);\        for (c = 0; c < channels; c++, k++)                                 \            d[k] = s[k] * gain;                                             \    }                                                                       \} FADE_PLANAR(dbl, double)FADE_PLANAR(flt, float)FADE_PLANAR(s16, int16_t)FADE_PLANAR(s32, int32_t) FADE(dbl, double)FADE(flt, float)FADE(s16, int16_t)FADE(s32, int32_t) #define SCALE_PLANAR(name, type)                                            \static void scale_samples_## name ##p(uint8_t **dst, uint8_t * const *src,  \                                     int nb_samples, int channels,          \                                     double gain)                           \{                                                                           \    int i, c;                                                               \                                                                            \    for (i = 0; i < nb_samples; i++) {                                      \        for (c = 0; c < channels; c++) {                                    \            type *d = (type *)dst[c];                                       \            const type *s = (type *)src[c];                                 \                                                                            \            d[i] = s[i] * gain;                                             \        }                                                                   \    }                                                                       \} #define SCALE(name, type)                                                   \static void scale_samples_## name (uint8_t **dst, uint8_t * const *src,     \                                  int nb_samples, int channels, double gain)\{                                                                           \    type *d = (type *)dst[0];                                               \    const type *s = (type *)src[0];                                         \    int i, c, k = 0;                                                        \                                                                            \    for (i = 0; i < nb_samples; i++) {                                      \        for (c = 0; c < channels; c++, k++)                                 \            d[k] = s[k] * gain;                                             \    }                                                                       \} SCALE_PLANAR(dbl, double)SCALE_PLANAR(flt, float)SCALE_PLANAR(s16, int16_t)SCALE_PLANAR(s32, int32_t) SCALE(dbl, double)SCALE(flt, float)SCALE(s16, int16_t)SCALE(s32, int32_t) static int config_output(AVFilterLink *outlink){    AVFilterContext *ctx = outlink->src;    AudioFadeContext *s  = ctx->priv;     switch (outlink->format) {    case AV_SAMPLE_FMT_DBL:  s->fade_samples = fade_samples_dbl;                             s->scale_samples = scale_samples_dbl;                             break;    case AV_SAMPLE_FMT_DBLP: s->fade_samples = fade_samples_dblp;                             s->scale_samples = scale_samples_dblp;                             break;    case AV_SAMPLE_FMT_FLT:  s->fade_samples = fade_samples_flt;                             s->scale_samples = scale_samples_flt;                             break;    case AV_SAMPLE_FMT_FLTP: s->fade_samples = fade_samples_fltp;                             s->scale_samples = scale_samples_fltp;                             break;    case AV_SAMPLE_FMT_S16:  s->fade_samples = fade_samples_s16;                             s->scale_samples = scale_samples_s16;                             break;    case AV_SAMPLE_FMT_S16P: s->fade_samples = fade_samples_s16p;                             s->scale_samples = scale_samples_s16p;                             break;    case AV_SAMPLE_FMT_S32:  s->fade_samples = fade_samples_s32;                             s->scale_samples = scale_samples_s32;                             break;    case AV_SAMPLE_FMT_S32P: s->fade_samples = fade_samples_s32p;                             s->scale_samples = scale_samples_s32p;                             break;    }     if (s->duration)        s->nb_samples = av_rescale(s->duration, outlink->sample_rate, AV_TIME_BASE);    s->duration = 0;    if (s->start_time)        s->start_sample = av_rescale(s->start_time, outlink->sample_rate, AV_TIME_BASE);    s->start_time = 0;     return 0;} #if CONFIG_AFADE_FILTER static const AVOption afade_options[] = {    { "type",         "set the fade direction",                      OFFSET(type),         AV_OPT_TYPE_INT,    {.i64 = 0    }, 0, 1, TFLAGS, .unit = "type" },    { "t",            "set the fade direction",                      OFFSET(type),         AV_OPT_TYPE_INT,    {.i64 = 0    }, 0, 1, TFLAGS, .unit = "type" },    { "in",           "fade-in",                                     0,                    AV_OPT_TYPE_CONST,  {.i64 = 0    }, 0, 0, TFLAGS, .unit = "type" },    { "out",          "fade-out",                                    0,                    AV_OPT_TYPE_CONST,  {.i64 = 1    }, 0, 0, TFLAGS, .unit = "type" },    { "start_sample", "set number of first sample to start fading",  OFFSET(start_sample), AV_OPT_TYPE_INT64,  {.i64 = 0    }, 0, INT64_MAX, TFLAGS },    { "ss",           "set number of first sample to start fading",  OFFSET(start_sample), AV_OPT_TYPE_INT64,  {.i64 = 0    }, 0, INT64_MAX, TFLAGS },    { "nb_samples",   "set number of samples for fade duration",     OFFSET(nb_samples),   AV_OPT_TYPE_INT64,  {.i64 = 44100}, 1, INT64_MAX, TFLAGS },    { "ns",           "set number of samples for fade duration",     OFFSET(nb_samples),   AV_OPT_TYPE_INT64,  {.i64 = 44100}, 1, INT64_MAX, TFLAGS },    { "start_time",   "set time to start fading",                    OFFSET(start_time),   AV_OPT_TYPE_DURATION, {.i64 = 0 },  0, INT64_MAX, TFLAGS },    { "st",           "set time to start fading",                    OFFSET(start_time),   AV_OPT_TYPE_DURATION, {.i64 = 0 },  0, INT64_MAX, TFLAGS },    { "duration",     "set fade duration",                           OFFSET(duration),     AV_OPT_TYPE_DURATION, {.i64 = 0 },  0, INT64_MAX, TFLAGS },    { "d",            "set fade duration",                           OFFSET(duration),     AV_OPT_TYPE_DURATION, {.i64 = 0 },  0, INT64_MAX, TFLAGS },    { "curve",        "set fade curve type",                         OFFSET(curve),        AV_OPT_TYPE_INT,    {.i64 = TRI  }, NONE, NB_CURVES - 1, TFLAGS, .unit = "curve" },    { "c",            "set fade curve type",                         OFFSET(curve),        AV_OPT_TYPE_INT,    {.i64 = TRI  }, NONE, NB_CURVES - 1, TFLAGS, .unit = "curve" },    { "nofade",       "no fade; keep audio as-is",                   0,                    AV_OPT_TYPE_CONST,  {.i64 = NONE }, 0, 0, TFLAGS, .unit = "curve" },    { "tri",          "linear slope",                                0,                    AV_OPT_TYPE_CONST,  {.i64 = TRI  }, 0, 0, TFLAGS, .unit = "curve" },    { "qsin",         "quarter of sine wave",                        0,                    AV_OPT_TYPE_CONST,  {.i64 = QSIN }, 0, 0, TFLAGS, .unit = "curve" },    { "esin",         "exponential sine wave",                       0,                    AV_OPT_TYPE_CONST,  {.i64 = ESIN }, 0, 0, TFLAGS, .unit = "curve" },    { "hsin",         "half of sine wave",                           0,                    AV_OPT_TYPE_CONST,  {.i64 = HSIN }, 0, 0, TFLAGS, .unit = "curve" },    { "log",          "logarithmic",                                 0,                    AV_OPT_TYPE_CONST,  {.i64 = LOG  }, 0, 0, TFLAGS, .unit = "curve" },    { "ipar",         "inverted parabola",                           0,                    AV_OPT_TYPE_CONST,  {.i64 = IPAR }, 0, 0, TFLAGS, .unit = "curve" },    { "qua",          "quadratic",                                   0,                    AV_OPT_TYPE_CONST,  {.i64 = QUA  }, 0, 0, TFLAGS, .unit = "curve" },    { "cub",          "cubic",                                       0,                    AV_OPT_TYPE_CONST,  {.i64 = CUB  }, 0, 0, TFLAGS, .unit = "curve" },    { "squ",          "square root",                                 0,                    AV_OPT_TYPE_CONST,  {.i64 = SQU  }, 0, 0, TFLAGS, .unit = "curve" },    { "cbr",          "cubic root",                                  0,                    AV_OPT_TYPE_CONST,  {.i64 = CBR  }, 0, 0, TFLAGS, .unit = "curve" },    { "par",          "parabola",                                    0,                    AV_OPT_TYPE_CONST,  {.i64 = PAR  }, 0, 0, TFLAGS, .unit = "curve" },    { "exp",          "exponential",                                 0,                    AV_OPT_TYPE_CONST,  {.i64 = EXP  }, 0, 0, TFLAGS, .unit = "curve" },    { "iqsin",        "inverted quarter of sine wave",               0,                    AV_OPT_TYPE_CONST,  {.i64 = IQSIN}, 0, 0, TFLAGS, .unit = "curve" },    { "ihsin",        "inverted half of sine wave",                  0,                    AV_OPT_TYPE_CONST,  {.i64 = IHSIN}, 0, 0, TFLAGS, .unit = "curve" },    { "dese",         "double-exponential seat",                     0,                    AV_OPT_TYPE_CONST,  {.i64 = DESE }, 0, 0, TFLAGS, .unit = "curve" },    { "desi",         "double-exponential sigmoid",                  0,                    AV_OPT_TYPE_CONST,  {.i64 = DESI }, 0, 0, TFLAGS, .unit = "curve" },    { "losi",         "logistic sigmoid",                            0,                    AV_OPT_TYPE_CONST,  {.i64 = LOSI }, 0, 0, TFLAGS, .unit = "curve" },    { "sinc",         "sine cardinal function",                      0,                    AV_OPT_TYPE_CONST,  {.i64 = SINC }, 0, 0, TFLAGS, .unit = "curve" },    { "isinc",        "inverted sine cardinal function",             0,                    AV_OPT_TYPE_CONST,  {.i64 = ISINC}, 0, 0, TFLAGS, .unit = "curve" },    { "quat",         "quartic",                                     0,                    AV_OPT_TYPE_CONST,  {.i64 = QUAT }, 0, 0, TFLAGS, .unit = "curve" },    { "quatr",        "quartic root",                                0,                    AV_OPT_TYPE_CONST,  {.i64 = QUATR}, 0, 0, TFLAGS, .unit = "curve" },    { "qsin2",        "squared quarter of sine wave",                0,                    AV_OPT_TYPE_CONST,  {.i64 = QSIN2}, 0, 0, TFLAGS, .unit = "curve" },    { "hsin2",        "squared half of sine wave",                   0,                    AV_OPT_TYPE_CONST,  {.i64 = HSIN2}, 0, 0, TFLAGS, .unit = "curve" },    { "silence",      "set the silence gain",                        OFFSET(silence),      AV_OPT_TYPE_DOUBLE, {.dbl = 0 },    0, 1, TFLAGS },    { "unity",        "set the unity gain",                          OFFSET(unity),        AV_OPT_TYPE_DOUBLE, {.dbl = 1 },    0, 1, TFLAGS },    { NULL }}; AVFILTER_DEFINE_CLASS(afade); static av_cold int init(AVFilterContext *ctx){    AudioFadeContext *s = ctx->priv;     if (INT64_MAX - s->nb_samples < s->start_sample)        return AVERROR(EINVAL);     return 0;} static int filter_frame(AVFilterLink *inlink, AVFrame *buf){    AudioFadeContext *s     = inlink->dst->priv;    AVFilterLink *outlink   = inlink->dst->outputs[0];    int nb_samples          = buf->nb_samples;    AVFrame *out_buf;    int64_t cur_sample = av_rescale_q(buf->pts, inlink->time_base, (AVRational){1, inlink->sample_rate});     if (s->unity == 1.0 &&        ((!s->type && (s->start_sample + s->nb_samples < cur_sample)) ||         ( s->type && (cur_sample + nb_samples < s->start_sample))))        return ff_filter_frame(outlink, buf);     if (av_frame_is_writable(buf)) {        out_buf = buf;    } else {        out_buf = ff_get_audio_buffer(outlink, nb_samples);        if (!out_buf)            return AVERROR(ENOMEM);        av_frame_copy_props(out_buf, buf);    }     if ((!s->type && (cur_sample + nb_samples < s->start_sample)) ||        ( s->type && (s->start_sample + s->nb_samples < cur_sample))) {        if (s->silence == 0.) {            av_samples_set_silence(out_buf->extended_data, 0, nb_samples,                                   out_buf->ch_layout.nb_channels, out_buf->format);        } else {            s->scale_samples(out_buf->extended_data, buf->extended_data,                             nb_samples, buf->ch_layout.nb_channels,                             s->silence);        }    } else if (( s->type && (cur_sample + nb_samples < s->start_sample)) ||               (!s->type && (s->start_sample + s->nb_samples < cur_sample))) {        s->scale_samples(out_buf->extended_data, buf->extended_data,                         nb_samples, buf->ch_layout.nb_channels,                         s->unity);    } else {        int64_t start;         if (!s->type)            start = cur_sample - s->start_sample;        else            start = s->start_sample + s->nb_samples - cur_sample;         s->fade_samples(out_buf->extended_data, buf->extended_data,                        nb_samples, buf->ch_layout.nb_channels,                        s->type ? -1 : 1, start,                        s->nb_samples, s->curve, s->silence, s->unity);    }     if (buf != out_buf)        av_frame_free(&buf);     return ff_filter_frame(outlink, out_buf);} 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;     return config_output(ctx->outputs[0]);} static const AVFilterPad avfilter_af_afade_inputs[] = {    {        .name         = "default",        .type         = AVMEDIA_TYPE_AUDIO,        .filter_frame = filter_frame,    },}; static const AVFilterPad avfilter_af_afade_outputs[] = {    {        .name         = "default",        .type         = AVMEDIA_TYPE_AUDIO,        .config_props = config_output,    },}; const FFFilter ff_af_afade = {    .p.name        = "afade",    .p.description = NULL_IF_CONFIG_SMALL("Fade in/out input audio."),    .p.priv_class  = &afade_class,    .p.flags       = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,    .priv_size     = sizeof(AudioFadeContext),    .init          = init,    FILTER_INPUTS(avfilter_af_afade_inputs),    FILTER_OUTPUTS(avfilter_af_afade_outputs),    FILTER_SAMPLEFMTS_ARRAY(sample_fmts),    .process_command = process_command,}; #endif /* CONFIG_AFADE_FILTER */ #if CONFIG_ACROSSFADE_FILTER static const AVOption acrossfade_options[] = {    { "nb_samples",   "set number of samples for cross fade duration", OFFSET(nb_samples),   AV_OPT_TYPE_INT64,  {.i64 = 44100}, 1, INT32_MAX/10, FLAGS },    { "ns",           "set number of samples for cross fade duration", OFFSET(nb_samples),   AV_OPT_TYPE_INT64,  {.i64 = 44100}, 1, INT32_MAX/10, FLAGS },    { "duration",     "set cross fade duration",                       OFFSET(duration),     AV_OPT_TYPE_DURATION, {.i64 = 0 },  0, 60000000, FLAGS },    { "d",            "set cross fade duration",                       OFFSET(duration),     AV_OPT_TYPE_DURATION, {.i64 = 0 },  0, 60000000, FLAGS },    { "overlap",      "overlap 1st stream end with 2nd stream start",  OFFSET(overlap),      AV_OPT_TYPE_BOOL,   {.i64 = 1    }, 0,  1, FLAGS },    { "o",            "overlap 1st stream end with 2nd stream start",  OFFSET(overlap),      AV_OPT_TYPE_BOOL,   {.i64 = 1    }, 0,  1, FLAGS },    { "curve1",       "set fade curve type for 1st stream",            OFFSET(curve),        AV_OPT_TYPE_INT,    {.i64 = TRI  }, NONE, NB_CURVES - 1, FLAGS, .unit = "curve" },    { "c1",           "set fade curve type for 1st stream",            OFFSET(curve),        AV_OPT_TYPE_INT,    {.i64 = TRI  }, NONE, NB_CURVES - 1, FLAGS, .unit = "curve" },    {     "nofade",   "no fade; keep audio as-is",                     0,                    AV_OPT_TYPE_CONST,  {.i64 = NONE }, 0, 0, FLAGS, .unit = "curve" },    {     "tri",      "linear slope",                                  0,                    AV_OPT_TYPE_CONST,  {.i64 = TRI  }, 0, 0, FLAGS, .unit = "curve" },    {     "qsin",     "quarter of sine wave",                          0,                    AV_OPT_TYPE_CONST,  {.i64 = QSIN }, 0, 0, FLAGS, .unit = "curve" },    {     "esin",     "exponential sine wave",                         0,                    AV_OPT_TYPE_CONST,  {.i64 = ESIN }, 0, 0, FLAGS, .unit = "curve" },    {     "hsin",     "half of sine wave",                             0,                    AV_OPT_TYPE_CONST,  {.i64 = HSIN }, 0, 0, FLAGS, .unit = "curve" },    {     "log",      "logarithmic",                                   0,                    AV_OPT_TYPE_CONST,  {.i64 = LOG  }, 0, 0, FLAGS, .unit = "curve" },    {     "ipar",     "inverted parabola",                             0,                    AV_OPT_TYPE_CONST,  {.i64 = IPAR }, 0, 0, FLAGS, .unit = "curve" },    {     "qua",      "quadratic",                                     0,                    AV_OPT_TYPE_CONST,  {.i64 = QUA  }, 0, 0, FLAGS, .unit = "curve" },    {     "cub",      "cubic",                                         0,                    AV_OPT_TYPE_CONST,  {.i64 = CUB  }, 0, 0, FLAGS, .unit = "curve" },    {     "squ",      "square root",                                   0,                    AV_OPT_TYPE_CONST,  {.i64 = SQU  }, 0, 0, FLAGS, .unit = "curve" },    {     "cbr",      "cubic root",                                    0,                    AV_OPT_TYPE_CONST,  {.i64 = CBR  }, 0, 0, FLAGS, .unit = "curve" },    {     "par",      "parabola",                                      0,                    AV_OPT_TYPE_CONST,  {.i64 = PAR  }, 0, 0, FLAGS, .unit = "curve" },    {     "exp",      "exponential",                                   0,                    AV_OPT_TYPE_CONST,  {.i64 = EXP  }, 0, 0, FLAGS, .unit = "curve" },    {     "iqsin",    "inverted quarter of sine wave",                 0,                    AV_OPT_TYPE_CONST,  {.i64 = IQSIN}, 0, 0, FLAGS, .unit = "curve" },    {     "ihsin",    "inverted half of sine wave",                    0,                    AV_OPT_TYPE_CONST,  {.i64 = IHSIN}, 0, 0, FLAGS, .unit = "curve" },    {     "dese",     "double-exponential seat",                       0,                    AV_OPT_TYPE_CONST,  {.i64 = DESE }, 0, 0, FLAGS, .unit = "curve" },    {     "desi",     "double-exponential sigmoid",                    0,                    AV_OPT_TYPE_CONST,  {.i64 = DESI }, 0, 0, FLAGS, .unit = "curve" },    {     "losi",     "logistic sigmoid",                              0,                    AV_OPT_TYPE_CONST,  {.i64 = LOSI }, 0, 0, FLAGS, .unit = "curve" },    {     "sinc",     "sine cardinal function",                        0,                    AV_OPT_TYPE_CONST,  {.i64 = SINC }, 0, 0, FLAGS, .unit = "curve" },    {     "isinc",    "inverted sine cardinal function",               0,                    AV_OPT_TYPE_CONST,  {.i64 = ISINC}, 0, 0, FLAGS, .unit = "curve" },    {     "quat",     "quartic",                                       0,                    AV_OPT_TYPE_CONST,  {.i64 = QUAT }, 0, 0, FLAGS, .unit = "curve" },    {     "quatr",    "quartic root",                                  0,                    AV_OPT_TYPE_CONST,  {.i64 = QUATR}, 0, 0, FLAGS, .unit = "curve" },    {     "qsin2",    "squared quarter of sine wave",                  0,                    AV_OPT_TYPE_CONST,  {.i64 = QSIN2}, 0, 0, FLAGS, .unit = "curve" },    {     "hsin2",    "squared half of sine wave",                     0,                    AV_OPT_TYPE_CONST,  {.i64 = HSIN2}, 0, 0, FLAGS, .unit = "curve" },    { "curve2",       "set fade curve type for 2nd stream",            OFFSET(curve2),       AV_OPT_TYPE_INT,    {.i64 = TRI  }, NONE, NB_CURVES - 1, FLAGS, .unit = "curve" },    { "c2",           "set fade curve type for 2nd stream",            OFFSET(curve2),       AV_OPT_TYPE_INT,    {.i64 = TRI  }, NONE, NB_CURVES - 1, FLAGS, .unit = "curve" },    { NULL }}; AVFILTER_DEFINE_CLASS(acrossfade); #define CROSSFADE_PLANAR(name, type)                                           \static void crossfade_samples_## name ##p(uint8_t **dst, uint8_t * const *cf0, \                                          uint8_t * const *cf1,                \                                          int nb_samples, int channels,        \                                          int curve0, int curve1)              \{                                                                              \    int i, c;                                                                  \                                                                               \

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