/* * 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 "libavutil/audio_fifo.h"#include "libavutil/opt.h"#include "audio.h"#include "avfilter.h"#include "internal.h" typedef struct {    const AVClass *class;    int type;    int curve, curve2;    int nb_samples;    int64_t start_sample;    int64_t duration;    int64_t start_time;    int overlap;    int cf0_eof;    int crossfade_is_over;    AVAudioFifo *fifo[2];    int64_t pts;     void (*fade_samples)(uint8_t **dst, uint8_t * const *src,                         int nb_samples, int channels, int direction,                         int64_t start, int range, int curve);    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 { TRI, QSIN, ESIN, HSIN, LOG, IPAR, QUA, CUB, SQU, CBR, PAR, EXP, IQSIN, IHSIN, DESE, DESI, NB_CURVES }; #define OFFSET(x) offsetof(AudioFadeContext, x)#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM static int query_formats(AVFilterContext *ctx){    AVFilterFormats *formats;    AVFilterChannelLayouts *layouts;    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    };    int ret;     layouts = ff_all_channel_counts();    if (!layouts)        return AVERROR(ENOMEM);    ret = ff_set_common_channel_layouts(ctx, layouts);    if (ret < 0)        return ret;     formats = ff_make_format_list(sample_fmts);    if (!formats)        return AVERROR(ENOMEM);    ret = ff_set_common_formats(ctx, formats);    if (ret < 0)        return ret;     formats = ff_all_samplerates();    if (!formats)        return AVERROR(ENOMEM);    return ff_set_common_samplerates(ctx, formats);} static double fade_gain(int curve, int64_t index, int range){#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;    }     return 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, int range, int curve)   \{                                                                           \    int i, c;                                                               \                                                                            \    for (i = 0; i < nb_samples; i++) {                                      \        double gain = fade_gain(curve, start + i * dir, range);             \        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, int range, int curve)      \{                                                                           \    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);             \        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) 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;  break;    case AV_SAMPLE_FMT_DBLP: s->fade_samples = fade_samples_dblp; break;    case AV_SAMPLE_FMT_FLT:  s->fade_samples = fade_samples_flt;  break;    case AV_SAMPLE_FMT_FLTP: s->fade_samples = fade_samples_fltp; break;    case AV_SAMPLE_FMT_S16:  s->fade_samples = fade_samples_s16;  break;    case AV_SAMPLE_FMT_S16P: s->fade_samples = fade_samples_s16p; break;    case AV_SAMPLE_FMT_S32:  s->fade_samples = fade_samples_s32;  break;    case AV_SAMPLE_FMT_S32P: s->fade_samples = fade_samples_s32p; break;    }     if (s->duration)        s->nb_samples = av_rescale(s->duration, outlink->sample_rate, AV_TIME_BASE);    if (s->start_time)        s->start_sample = av_rescale(s->start_time, outlink->sample_rate, AV_TIME_BASE);     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, FLAGS, "type" },    { "t",            "set the fade direction",                      OFFSET(type),         AV_OPT_TYPE_INT,    {.i64 = 0    }, 0, 1, FLAGS, "type" },    { "in",           "fade-in",                                     0,                    AV_OPT_TYPE_CONST,  {.i64 = 0    }, 0, 0, FLAGS, "type" },    { "out",          "fade-out",                                    0,                    AV_OPT_TYPE_CONST,  {.i64 = 1    }, 0, 0, FLAGS, "type" },    { "start_sample", "set number of first sample to start fading",  OFFSET(start_sample), AV_OPT_TYPE_INT64,  {.i64 = 0    }, 0, INT64_MAX, FLAGS },    { "ss",           "set number of first sample to start fading",  OFFSET(start_sample), AV_OPT_TYPE_INT64,  {.i64 = 0    }, 0, INT64_MAX, FLAGS },    { "nb_samples",   "set number of samples for fade duration",     OFFSET(nb_samples),   AV_OPT_TYPE_INT,    {.i64 = 44100}, 1, INT32_MAX, FLAGS },    { "ns",           "set number of samples for fade duration",     OFFSET(nb_samples),   AV_OPT_TYPE_INT,    {.i64 = 44100}, 1, INT32_MAX, FLAGS },    { "start_time",   "set time to start fading",                    OFFSET(start_time),   AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },    { "st",           "set time to start fading",                    OFFSET(start_time),   AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },    { "duration",     "set fade duration",                           OFFSET(duration),     AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },    { "d",            "set fade duration",                           OFFSET(duration),     AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },    { "curve",        "set fade curve type",                         OFFSET(curve),        AV_OPT_TYPE_INT,    {.i64 = TRI  }, 0, NB_CURVES - 1, FLAGS, "curve" },    { "c",            "set fade curve type",                         OFFSET(curve),        AV_OPT_TYPE_INT,    {.i64 = TRI  }, 0, NB_CURVES - 1, FLAGS, "curve" },    { "tri",          "linear slope",                                0,                    AV_OPT_TYPE_CONST,  {.i64 = TRI  }, 0, 0, FLAGS, "curve" },    { "qsin",         "quarter of sine wave",                        0,                    AV_OPT_TYPE_CONST,  {.i64 = QSIN }, 0, 0, FLAGS, "curve" },    { "esin",         "exponential sine wave",                       0,                    AV_OPT_TYPE_CONST,  {.i64 = ESIN }, 0, 0, FLAGS, "curve" },    { "hsin",         "half of sine wave",                           0,                    AV_OPT_TYPE_CONST,  {.i64 = HSIN }, 0, 0, FLAGS, "curve" },    { "log",          "logarithmic",                                 0,                    AV_OPT_TYPE_CONST,  {.i64 = LOG  }, 0, 0, FLAGS, "curve" },    { "ipar",         "inverted parabola",                           0,                    AV_OPT_TYPE_CONST,  {.i64 = IPAR }, 0, 0, FLAGS, "curve" },    { "qua",          "quadratic",                                   0,                    AV_OPT_TYPE_CONST,  {.i64 = QUA  }, 0, 0, FLAGS, "curve" },    { "cub",          "cubic",                                       0,                    AV_OPT_TYPE_CONST,  {.i64 = CUB  }, 0, 0, FLAGS, "curve" },    { "squ",          "square root",                                 0,                    AV_OPT_TYPE_CONST,  {.i64 = SQU  }, 0, 0, FLAGS, "curve" },    { "cbr",          "cubic root",                                  0,                    AV_OPT_TYPE_CONST,  {.i64 = CBR  }, 0, 0, FLAGS, "curve" },    { "par",          "parabola",                                    0,                    AV_OPT_TYPE_CONST,  {.i64 = PAR  }, 0, 0, FLAGS, "curve" },    { "exp",          "exponential",                                 0,                    AV_OPT_TYPE_CONST,  {.i64 = EXP  }, 0, 0, FLAGS, "curve" },    { "iqsin",        "inverted quarter of sine wave",               0,                    AV_OPT_TYPE_CONST,  {.i64 = IQSIN}, 0, 0, FLAGS, "curve" },    { "ihsin",        "inverted half of sine wave",                  0,                    AV_OPT_TYPE_CONST,  {.i64 = IHSIN}, 0, 0, FLAGS, "curve" },    { "dese",         "double-exponential seat",                     0,                    AV_OPT_TYPE_CONST,  {.i64 = DESE }, 0, 0, FLAGS, "curve" },    { "desi",         "double-exponential sigmoid",                  0,                    AV_OPT_TYPE_CONST,  {.i64 = DESI }, 0, 0, FLAGS, "curve" },    { 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->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(inlink, 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))) {        av_samples_set_silence(out_buf->extended_data, 0, nb_samples,                               av_frame_get_channels(out_buf), out_buf->format);    } 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, av_frame_get_channels(buf),                        s->type ? -1 : 1, start,                        s->nb_samples, s->curve);    }     if (buf != out_buf)        av_frame_free(&buf);     return ff_filter_frame(outlink, out_buf);} static const AVFilterPad avfilter_af_afade_inputs[] = {    {        .name         = "default",        .type         = AVMEDIA_TYPE_AUDIO,        .filter_frame = filter_frame,    },    { NULL }}; static const AVFilterPad avfilter_af_afade_outputs[] = {    {        .name         = "default",        .type         = AVMEDIA_TYPE_AUDIO,        .config_props = config_output,    },    { NULL }}; AVFilter ff_af_afade = {    .name          = "afade",    .description   = NULL_IF_CONFIG_SMALL("Fade in/out input audio."),    .query_formats = query_formats,    .priv_size     = sizeof(AudioFadeContext),    .init          = init,    .inputs        = avfilter_af_afade_inputs,    .outputs       = avfilter_af_afade_outputs,    .priv_class    = &afade_class,    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,}; #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_INT,    {.i64 = 44100}, 1, INT32_MAX/10, FLAGS },    { "ns",           "set number of samples for cross fade duration", OFFSET(nb_samples),   AV_OPT_TYPE_INT,    {.i64 = 44100}, 1, INT32_MAX/10, FLAGS },    { "duration",     "set cross fade duration",                       OFFSET(duration),     AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, 60, FLAGS },    { "d",            "set cross fade duration",                       OFFSET(duration),     AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, 60, 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  }, 0, NB_CURVES - 1, FLAGS, "curve" },    { "c1",           "set fade curve type for 1st stream",            OFFSET(curve),        AV_OPT_TYPE_INT,    {.i64 = TRI  }, 0, NB_CURVES - 1, FLAGS, "curve" },    {     "tri",      "linear slope",                                  0,                    AV_OPT_TYPE_CONST,  {.i64 = TRI  }, 0, 0, FLAGS, "curve" },    {     "qsin",     "quarter of sine wave",                          0,                    AV_OPT_TYPE_CONST,  {.i64 = QSIN }, 0, 0, FLAGS, "curve" },    {     "esin",     "exponential sine wave",                         0,                    AV_OPT_TYPE_CONST,  {.i64 = ESIN }, 0, 0, FLAGS, "curve" },    {     "hsin",     "half of sine wave",                             0,                    AV_OPT_TYPE_CONST,  {.i64 = HSIN }, 0, 0, FLAGS, "curve" },    {     "log",      "logarithmic",                                   0,                    AV_OPT_TYPE_CONST,  {.i64 = LOG  }, 0, 0, FLAGS, "curve" },    {     "ipar",     "inverted parabola",                             0,                    AV_OPT_TYPE_CONST,  {.i64 = IPAR }, 0, 0, FLAGS, "curve" },    {     "qua",      "quadratic",                                     0,                    AV_OPT_TYPE_CONST,  {.i64 = QUA  }, 0, 0, FLAGS, "curve" },    {     "cub",      "cubic",                                         0,                    AV_OPT_TYPE_CONST,  {.i64 = CUB  }, 0, 0, FLAGS, "curve" },    {     "squ",      "square root",                                   0,                    AV_OPT_TYPE_CONST,  {.i64 = SQU  }, 0, 0, FLAGS, "curve" },    {     "cbr",      "cubic root",                                    0,                    AV_OPT_TYPE_CONST,  {.i64 = CBR  }, 0, 0, FLAGS, "curve" },    {     "par",      "parabola",                                      0,                    AV_OPT_TYPE_CONST,  {.i64 = PAR  }, 0, 0, FLAGS, "curve" },    {     "exp",      "exponential",                                   0,                    AV_OPT_TYPE_CONST,  {.i64 = EXP  }, 0, 0, FLAGS, "curve" },    {     "iqsin",    "inverted quarter of sine wave",                 0,                    AV_OPT_TYPE_CONST,  {.i64 = IQSIN}, 0, 0, FLAGS, "curve" },    {     "ihsin",    "inverted half of sine wave",                    0,                    AV_OPT_TYPE_CONST,  {.i64 = IHSIN}, 0, 0, FLAGS, "curve" },    {     "dese",     "double-exponential seat",                       0,                    AV_OPT_TYPE_CONST,  {.i64 = DESE }, 0, 0, FLAGS, "curve" },    {     "desi",     "double-exponential sigmoid",                    0,                    AV_OPT_TYPE_CONST,  {.i64 = DESI }, 0, 0, FLAGS, "curve" },    { "curve2",       "set fade curve type for 2nd stream",            OFFSET(curve2),       AV_OPT_TYPE_INT,    {.i64 = TRI  }, 0, NB_CURVES - 1, FLAGS, "curve" },    { "c2",           "set fade curve type for 2nd stream",            OFFSET(curve2),       AV_OPT_TYPE_INT,    {.i64 = TRI  }, 0, NB_CURVES - 1, FLAGS, "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;                                                                  \                                                                               \    for (i = 0; i < nb_samples; i++) {                                         \        double gain0 = fade_gain(curve0, nb_samples - 1 - i, nb_samples);      \        double gain1 = fade_gain(curve1, i, nb_samples);                       \        for (c = 0; c < channels; c++) {                                       \            type *d = (type *)dst[c];                                          \            const type *s0 = (type *)cf0[c];                                   \            const type *s1 = (type *)cf1[c];                                   \                                                                               \            d[i] = s0[i] * gain0 + s1[i] * gain1;                              \        }                                                                      \    }                                                                          \} #define CROSSFADE(name, type)                                               \static void crossfade_samples_## name (uint8_t **dst, uint8_t * const *cf0, \                                       uint8_t * const *cf1,                \                                       int nb_samples, int channels,        \                                       int curve0, int curve1)              \{                                                                           \    type *d = (type *)dst[0];                                               \    const type *s0 = (type *)cf0[0];                                        \    const type *s1 = (type *)cf1[0];                                        \    int i, c, k = 0;                                                        \                                                                            \    for (i = 0; i < nb_samples; i++) {                                      \        double gain0 = fade_gain(curve0, nb_samples - 1 - i, nb_samples);   \        double gain1 = fade_gain(curve1, i, nb_samples);                    \        for (c = 0; c < channels; c++, k++)                                 \            d[k] = s0[k] * gain0 + s1[k] * gain1;                           \    }                                                                       \} CROSSFADE_PLANAR(dbl, double)CROSSFADE_PLANAR(flt, float)CROSSFADE_PLANAR(s16, int16_t)CROSSFADE_PLANAR(s32, int32_t) CROSSFADE(dbl, double)CROSSFADE(flt, float)CROSSFADE(s16, int16_t)CROSSFADE(s32, int32_t) static int acrossfade_filter_frame(AVFilterLink *inlink, AVFrame *in){    AVFilterContext *ctx  = inlink->dst;    AudioFadeContext *s   = ctx->priv;    AVFilterLink *outlink = ctx->outputs[0];    AVFrame *out, *cf[2] = { NULL };    int ret = 0, nb_samples;     if (s->crossfade_is_over) {        in->pts = s->pts;        s->pts += av_rescale_q(in->nb_samples,            (AVRational){ 1, outlink->sample_rate }, outlink->time_base);        return ff_filter_frame(outlink, in);    } else if (inlink == ctx->inputs[0]) {        av_audio_fifo_write(s->fifo[0], (void **)in->extended_data, in->nb_samples);         nb_samples = av_audio_fifo_size(s->fifo[0]) - s->nb_samples;        if (nb_samples > 0) {            out = ff_get_audio_buffer(outlink, nb_samples);            if (!out) {                ret = AVERROR(ENOMEM);                goto fail;            }            av_audio_fifo_read(s->fifo[0], (void **)out->extended_data, nb_samples);            out->pts = s->pts;            s->pts += av_rescale_q(nb_samples,                (AVRational){ 1, outlink->sample_rate }, outlink->time_base);            ret = ff_filter_frame(outlink, out);        }    } else if (av_audio_fifo_size(s->fifo[1]) < s->nb_samples) {        if (!s->overlap && av_audio_fifo_size(s->fifo[0]) > 0) {            nb_samples = av_audio_fifo_size(s->fifo[0]);             cf[0] = ff_get_audio_buffer(outlink, nb_samples);            out = ff_get_audio_buffer(outlink, nb_samples);            if (!out || !cf[0]) {                ret = AVERROR(ENOMEM);                goto fail;            }            av_audio_fifo_read(s->fifo[0], (void **)cf[0]->extended_data, nb_samples);             s->fade_samples(out->extended_data, cf[0]->extended_data, nb_samples,                            outlink->channels, -1, nb_samples - 1, nb_samples, s->curve);            out->pts = s->pts;            s->pts += av_rescale_q(nb_samples,                (AVRational){ 1, outlink->sample_rate }, outlink->time_base);            ret = ff_filter_frame(outlink, out);            if (ret < 0)                goto fail;        }         av_audio_fifo_write(s->fifo[1], (void **)in->extended_data, in->nb_samples);    } else if (av_audio_fifo_size(s->fifo[1]) >= s->nb_samples) {        av_audio_fifo_write(s->fifo[1], (void **)in->extended_data, in->nb_samples);         if (s->overlap) {            cf[0] = ff_get_audio_buffer(outlink, s->nb_samples);            cf[1] = ff_get_audio_buffer(outlink, s->nb_samples);            out = ff_get_audio_buffer(outlink, s->nb_samples);            if (!out || !cf[0] || !cf[1]) {                av_frame_free(&out);                ret = AVERROR(ENOMEM);                goto fail;            }             av_audio_fifo_read(s->fifo[0], (void **)cf[0]->extended_data, s->nb_samples);            av_audio_fifo_read(s->fifo[1], (void **)cf[1]->extended_data, s->nb_samples);             s->crossfade_samples(out->extended_data, cf[0]->extended_data,                                 cf[1]->extended_data,

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