falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
100142 Commits
32 Branches
661MB
Tree: 51f8848e36
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '51f8848e36'
${ noResults }
FFmpeg/libavfilter/af_afade.c

652 lines
31KB
Raw Blame History 

  1. /*

  2.  * Copyright (c) 2013-2015 Paul B Mahol

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

  6.  * FFmpeg is free software; you can redistribute it and/or

  7.  * modify it under the terms of the GNU Lesser General Public

  8.  * License as published by the Free Software Foundation; either

  9.  * version 2.1 of the License, or (at your option) any later version.

  10.  *

  11.  * FFmpeg is distributed in the hope that it will be useful,

  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  14.  * Lesser General Public License for more details.

  15.  *

  16.  * You should have received a copy of the GNU Lesser General Public

  17.  * License along with FFmpeg; if not, write to the Free Software

  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  19.  */

  20. 

  21. /**

  22.  * @file

  23.  * fade audio filter

  24.  */

  25. 

  26. #include "libavutil/opt.h"

  27. #include "audio.h"

  28. #include "avfilter.h"

  29. #include "filters.h"

  30. #include "internal.h"

  31. 

  32. typedef struct AudioFadeContext {

  33.     const AVClass *class;

  34.     int type;

  35.     int curve, curve2;

  36.     int64_t nb_samples;

  37.     int64_t start_sample;

  38.     int64_t duration;

  39.     int64_t start_time;

  40.     int overlap;

  41.     int cf0_eof;

  42.     int crossfade_is_over;

  43.     int64_t pts;

  44. 

  45.     void (*fade_samples)(uint8_t **dst, uint8_t * const *src,

  46.                          int nb_samples, int channels, int direction,

  47.                          int64_t start, int64_t range, int curve);

  48.     void (*crossfade_samples)(uint8_t **dst, uint8_t * const *cf0,

  49.                               uint8_t * const *cf1,

  50.                               int nb_samples, int channels,

  51.                               int curve0, int curve1);

  52. } AudioFadeContext;

  53. 

  54. enum CurveType { NONE = -1, TRI, QSIN, ESIN, HSIN, LOG, IPAR, QUA, CUB, SQU, CBR, PAR, EXP, IQSIN, IHSIN, DESE, DESI, LOSI, SINC, ISINC, NB_CURVES };

  55. 

  56. #define OFFSET(x) offsetof(AudioFadeContext, x)

  57. #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

  58. 

  59. static int query_formats(AVFilterContext *ctx)

  60. {

  61.     AVFilterFormats *formats;

  62.     AVFilterChannelLayouts *layouts;

  63.     static const enum AVSampleFormat sample_fmts[] = {

  64.         AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S16P,

  65.         AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_S32P,

  66.         AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_FLTP,

  67.         AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_DBLP,

  68.         AV_SAMPLE_FMT_NONE

  69.     };

  70.     int ret;

  71. 

  72.     layouts = ff_all_channel_counts();

  73.     if (!layouts)

  74.         return AVERROR(ENOMEM);

  75.     ret = ff_set_common_channel_layouts(ctx, layouts);

  76.     if (ret < 0)

  77.         return ret;

  78. 

  79.     formats = ff_make_format_list(sample_fmts);

  80.     if (!formats)

  81.         return AVERROR(ENOMEM);

  82.     ret = ff_set_common_formats(ctx, formats);

  83.     if (ret < 0)

  84.         return ret;

  85. 

  86.     formats = ff_all_samplerates();

  87.     if (!formats)

  88.         return AVERROR(ENOMEM);

  89.     return ff_set_common_samplerates(ctx, formats);

  90. }

  91. 

  92. static double fade_gain(int curve, int64_t index, int64_t range)

  93. {

  94. #define CUBE(a) ((a)*(a)*(a))

  95.     double gain;

  96. 

  97.     gain = av_clipd(1.0 * index / range, 0, 1.0);

  98. 

  99.     switch (curve) {

  100.     case QSIN:

  101.         gain = sin(gain * M_PI / 2.0);

  102.         break;

  103.     case IQSIN:

  104.         /* 0.6... = 2 / M_PI */

  105.         gain = 0.6366197723675814 * asin(gain);

  106.         break;

  107.     case ESIN:

  108.         gain = 1.0 - cos(M_PI / 4.0 * (CUBE(2.0*gain - 1) + 1));

  109.         break;

  110.     case HSIN:

  111.         gain = (1.0 - cos(gain * M_PI)) / 2.0;

  112.         break;

  113.     case IHSIN:

  114.         /* 0.3... = 1 / M_PI */

  115.         gain = 0.3183098861837907 * acos(1 - 2 * gain);

  116.         break;

  117.     case EXP:

  118.         /* -11.5... = 5*ln(0.1) */

  119.         gain = exp(-11.512925464970227 * (1 - gain));

  120.         break;

  121.     case LOG:

  122.         gain = av_clipd(1 + 0.2 * log10(gain), 0, 1.0);

  123.         break;

  124.     case PAR:

  125.         gain = 1 - sqrt(1 - gain);

  126.         break;

  127.     case IPAR:

  128.         gain = (1 - (1 - gain) * (1 - gain));

  129.         break;

  130.     case QUA:

  131.         gain *= gain;

  132.         break;

  133.     case CUB:

  134.         gain = CUBE(gain);

  135.         break;

  136.     case SQU:

  137.         gain = sqrt(gain);

  138.         break;

  139.     case CBR:

  140.         gain = cbrt(gain);

  141.         break;

  142.     case DESE:

  143.         gain = gain <= 0.5 ? cbrt(2 * gain) / 2: 1 - cbrt(2 * (1 - gain)) / 2;

  144.         break;

  145.     case DESI:

  146.         gain = gain <= 0.5 ? CUBE(2 * gain) / 2: 1 - CUBE(2 * (1 - gain)) / 2;

  147.         break;

  148.     case LOSI: {

  149.                    const double a = 1. / (1. - 0.787) - 1;

  150.                    double A = 1. / (1.0 + exp(0 -((gain-0.5) * a * 2.0)));

  151.                    double B = 1. / (1.0 + exp(a));

  152.                    double C = 1. / (1.0 + exp(0-a));

  153.                    gain = (A - B) / (C - B);

  154.                }

  155.         break;

  156.     case SINC:

  157.         gain = gain >= 1.0 ? 1.0 : sin(M_PI * (1.0 - gain)) / (M_PI * (1.0 - gain));

  158.         break;

  159.     case ISINC:

  160.         gain = gain <= 0.0 ? 0.0 : 1.0 - sin(M_PI * gain) / (M_PI * gain);

  161.         break;

  162.     case NONE:

  163.         gain = 1.0;

  164.         break;

  165.     }

  166. 

  167.     return gain;

  168. }

  169. 

  170. #define FADE_PLANAR(name, type)                                             \

  171. static void fade_samples_## name ##p(uint8_t **dst, uint8_t * const *src,   \

  172.                                      int nb_samples, int channels, int dir, \

  173.                                      int64_t start, int64_t range, int curve) \

  174. {                                                                           \

  175.     int i, c;                                                               \

  176.                                                                             \

  177.     for (i = 0; i < nb_samples; i++) {                                      \

  178.         double gain = fade_gain(curve, start + i * dir, range);             \

  179.         for (c = 0; c < channels; c++) {                                    \

  180.             type *d = (type *)dst[c];                                       \

  181.             const type *s = (type *)src[c];                                 \

  182.                                                                             \

  183.             d[i] = s[i] * gain;                                             \

  184.         }                                                                   \

  185.     }                                                                       \

  186. }

  187. 

  188. #define FADE(name, type)                                                    \

  189. static void fade_samples_## name (uint8_t **dst, uint8_t * const *src,      \

  190.                                   int nb_samples, int channels, int dir,    \

  191.                                   int64_t start, int64_t range, int curve)  \

  192. {                                                                           \

  193.     type *d = (type *)dst[0];                                               \

  194.     const type *s = (type *)src[0];                                         \

  195.     int i, c, k = 0;                                                        \

  196.                                                                             \

  197.     for (i = 0; i < nb_samples; i++) {                                      \

  198.         double gain = fade_gain(curve, start + i * dir, range);             \

  199.         for (c = 0; c < channels; c++, k++)                                 \

  200.             d[k] = s[k] * gain;                                             \

  201.     }                                                                       \

  202. }

  203. 

  204. FADE_PLANAR(dbl, double)

  205. FADE_PLANAR(flt, float)

  206. FADE_PLANAR(s16, int16_t)

  207. FADE_PLANAR(s32, int32_t)

  208. 

  209. FADE(dbl, double)

  210. FADE(flt, float)

  211. FADE(s16, int16_t)

  212. FADE(s32, int32_t)

  213. 

  214. static int config_output(AVFilterLink *outlink)

  215. {

  216.     AVFilterContext *ctx = outlink->src;

  217.     AudioFadeContext *s  = ctx->priv;

  218. 

  219.     switch (outlink->format) {

  220.     case AV_SAMPLE_FMT_DBL:  s->fade_samples = fade_samples_dbl;  break;

  221.     case AV_SAMPLE_FMT_DBLP: s->fade_samples = fade_samples_dblp; break;

  222.     case AV_SAMPLE_FMT_FLT:  s->fade_samples = fade_samples_flt;  break;

  223.     case AV_SAMPLE_FMT_FLTP: s->fade_samples = fade_samples_fltp; break;

  224.     case AV_SAMPLE_FMT_S16:  s->fade_samples = fade_samples_s16;  break;

  225.     case AV_SAMPLE_FMT_S16P: s->fade_samples = fade_samples_s16p; break;

  226.     case AV_SAMPLE_FMT_S32:  s->fade_samples = fade_samples_s32;  break;

  227.     case AV_SAMPLE_FMT_S32P: s->fade_samples = fade_samples_s32p; break;

  228.     }

  229. 

  230.     if (s->duration)

  231.         s->nb_samples = av_rescale(s->duration, outlink->sample_rate, AV_TIME_BASE);

  232.     if (s->start_time)

  233.         s->start_sample = av_rescale(s->start_time, outlink->sample_rate, AV_TIME_BASE);

  234. 

  235.     return 0;

  236. }

  237. 

  238. #if CONFIG_AFADE_FILTER

  239. 

  240. static const AVOption afade_options[] = {

  241.     { "type",         "set the fade direction",                      OFFSET(type),         AV_OPT_TYPE_INT,    {.i64 = 0    }, 0, 1, FLAGS, "type" },

  242.     { "t",            "set the fade direction",                      OFFSET(type),         AV_OPT_TYPE_INT,    {.i64 = 0    }, 0, 1, FLAGS, "type" },

  243.     { "in",           "fade-in",                                     0,                    AV_OPT_TYPE_CONST,  {.i64 = 0    }, 0, 0, FLAGS, "type" },

  244.     { "out",          "fade-out",                                    0,                    AV_OPT_TYPE_CONST,  {.i64 = 1    }, 0, 0, FLAGS, "type" },

  245.     { "start_sample", "set number of first sample to start fading",  OFFSET(start_sample), AV_OPT_TYPE_INT64,  {.i64 = 0    }, 0, INT64_MAX, FLAGS },

  246.     { "ss",           "set number of first sample to start fading",  OFFSET(start_sample), AV_OPT_TYPE_INT64,  {.i64 = 0    }, 0, INT64_MAX, FLAGS },

  247.     { "nb_samples",   "set number of samples for fade duration",     OFFSET(nb_samples),   AV_OPT_TYPE_INT64,  {.i64 = 44100}, 1, INT64_MAX, FLAGS },

  248.     { "ns",           "set number of samples for fade duration",     OFFSET(nb_samples),   AV_OPT_TYPE_INT64,  {.i64 = 44100}, 1, INT64_MAX, FLAGS },

  249.     { "start_time",   "set time to start fading",                    OFFSET(start_time),   AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT64_MAX, FLAGS },

  250.     { "st",           "set time to start fading",                    OFFSET(start_time),   AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT64_MAX, FLAGS },

  251.     { "duration",     "set fade duration",                           OFFSET(duration),     AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT64_MAX, FLAGS },

  252.     { "d",            "set fade duration",                           OFFSET(duration),     AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT64_MAX, FLAGS },

  253.     { "curve",        "set fade curve type",                         OFFSET(curve),        AV_OPT_TYPE_INT,    {.i64 = TRI  }, NONE, NB_CURVES - 1, FLAGS, "curve" },

  254.     { "c",            "set fade curve type",                         OFFSET(curve),        AV_OPT_TYPE_INT,    {.i64 = TRI  }, NONE, NB_CURVES - 1, FLAGS, "curve" },

  255.     { "nofade",       "no fade; keep audio as-is",                   0,                    AV_OPT_TYPE_CONST,  {.i64 = NONE }, 0, 0, FLAGS, "curve" },

  256.     { "tri",          "linear slope",                                0,                    AV_OPT_TYPE_CONST,  {.i64 = TRI  }, 0, 0, FLAGS, "curve" },

  257.     { "qsin",         "quarter of sine wave",                        0,                    AV_OPT_TYPE_CONST,  {.i64 = QSIN }, 0, 0, FLAGS, "curve" },

  258.     { "esin",         "exponential sine wave",                       0,                    AV_OPT_TYPE_CONST,  {.i64 = ESIN }, 0, 0, FLAGS, "curve" },

  259.     { "hsin",         "half of sine wave",                           0,                    AV_OPT_TYPE_CONST,  {.i64 = HSIN }, 0, 0, FLAGS, "curve" },

  260.     { "log",          "logarithmic",                                 0,                    AV_OPT_TYPE_CONST,  {.i64 = LOG  }, 0, 0, FLAGS, "curve" },

  261.     { "ipar",         "inverted parabola",                           0,                    AV_OPT_TYPE_CONST,  {.i64 = IPAR }, 0, 0, FLAGS, "curve" },

  262.     { "qua",          "quadratic",                                   0,                    AV_OPT_TYPE_CONST,  {.i64 = QUA  }, 0, 0, FLAGS, "curve" },

  263.     { "cub",          "cubic",                                       0,                    AV_OPT_TYPE_CONST,  {.i64 = CUB  }, 0, 0, FLAGS, "curve" },

  264.     { "squ",          "square root",                                 0,                    AV_OPT_TYPE_CONST,  {.i64 = SQU  }, 0, 0, FLAGS, "curve" },

  265.     { "cbr",          "cubic root",                                  0,                    AV_OPT_TYPE_CONST,  {.i64 = CBR  }, 0, 0, FLAGS, "curve" },

  266.     { "par",          "parabola",                                    0,                    AV_OPT_TYPE_CONST,  {.i64 = PAR  }, 0, 0, FLAGS, "curve" },

  267.     { "exp",          "exponential",                                 0,                    AV_OPT_TYPE_CONST,  {.i64 = EXP  }, 0, 0, FLAGS, "curve" },

  268.     { "iqsin",        "inverted quarter of sine wave",               0,                    AV_OPT_TYPE_CONST,  {.i64 = IQSIN}, 0, 0, FLAGS, "curve" },

  269.     { "ihsin",        "inverted half of sine wave",                  0,                    AV_OPT_TYPE_CONST,  {.i64 = IHSIN}, 0, 0, FLAGS, "curve" },

  270.     { "dese",         "double-exponential seat",                     0,                    AV_OPT_TYPE_CONST,  {.i64 = DESE }, 0, 0, FLAGS, "curve" },

  271.     { "desi",         "double-exponential sigmoid",                  0,                    AV_OPT_TYPE_CONST,  {.i64 = DESI }, 0, 0, FLAGS, "curve" },

  272.     { "losi",         "logistic sigmoid",                            0,                    AV_OPT_TYPE_CONST,  {.i64 = LOSI }, 0, 0, FLAGS, "curve" },

  273.     { "sinc",         "sine cardinal function",                      0,                    AV_OPT_TYPE_CONST,  {.i64 = SINC }, 0, 0, FLAGS, "curve" },

  274.     { "isinc",        "inverted sine cardinal function",             0,                    AV_OPT_TYPE_CONST,  {.i64 = ISINC}, 0, 0, FLAGS, "curve" },

  275.     { NULL }

  276. };

  277. 

  278. AVFILTER_DEFINE_CLASS(afade);

  279. 

  280. static av_cold int init(AVFilterContext *ctx)

  281. {

  282.     AudioFadeContext *s = ctx->priv;

  283. 

  284.     if (INT64_MAX - s->nb_samples < s->start_sample)

  285.         return AVERROR(EINVAL);

  286. 

  287.     return 0;

  288. }

  289. 

  290. static int filter_frame(AVFilterLink *inlink, AVFrame *buf)

  291. {

  292.     AudioFadeContext *s     = inlink->dst->priv;

  293.     AVFilterLink *outlink   = inlink->dst->outputs[0];

  294.     int nb_samples          = buf->nb_samples;

  295.     AVFrame *out_buf;

  296.     int64_t cur_sample = av_rescale_q(buf->pts, inlink->time_base, (AVRational){1, inlink->sample_rate});

  297. 

  298.     if ((!s->type && (s->start_sample + s->nb_samples < cur_sample)) ||

  299.         ( s->type && (cur_sample + nb_samples < s->start_sample)))

  300.         return ff_filter_frame(outlink, buf);

  301. 

  302.     if (av_frame_is_writable(buf)) {

  303.         out_buf = buf;

  304.     } else {

  305.         out_buf = ff_get_audio_buffer(outlink, nb_samples);

  306.         if (!out_buf)

  307.             return AVERROR(ENOMEM);

  308.         av_frame_copy_props(out_buf, buf);

  309.     }

  310. 

  311.     if ((!s->type && (cur_sample + nb_samples < s->start_sample)) ||

  312.         ( s->type && (s->start_sample + s->nb_samples < cur_sample))) {

  313.         av_samples_set_silence(out_buf->extended_data, 0, nb_samples,

  314.                                out_buf->channels, out_buf->format);

  315.     } else {

  316.         int64_t start;

  317. 

  318.         if (!s->type)

  319.             start = cur_sample - s->start_sample;

  320.         else

  321.             start = s->start_sample + s->nb_samples - cur_sample;

  322. 

  323.         s->fade_samples(out_buf->extended_data, buf->extended_data,

  324.                         nb_samples, buf->channels,

  325.                         s->type ? -1 : 1, start,

  326.                         s->nb_samples, s->curve);

  327.     }

  328. 

  329.     if (buf != out_buf)

  330.         av_frame_free(&buf);

  331. 

  332.     return ff_filter_frame(outlink, out_buf);

  333. }

  334. 

  335. static const AVFilterPad avfilter_af_afade_inputs[] = {

  336.     {

  337.         .name         = "default",

  338.         .type         = AVMEDIA_TYPE_AUDIO,

  339.         .filter_frame = filter_frame,

  340.     },

  341.     { NULL }

  342. };

  343. 

  344. static const AVFilterPad avfilter_af_afade_outputs[] = {

  345.     {

  346.         .name         = "default",

  347.         .type         = AVMEDIA_TYPE_AUDIO,

  348.         .config_props = config_output,

  349.     },

  350.     { NULL }

  351. };

  352. 

  353. AVFilter ff_af_afade = {

  354.     .name          = "afade",

  355.     .description   = NULL_IF_CONFIG_SMALL("Fade in/out input audio."),

  356.     .query_formats = query_formats,

  357.     .priv_size     = sizeof(AudioFadeContext),

  358.     .init          = init,

  359.     .inputs        = avfilter_af_afade_inputs,

  360.     .outputs       = avfilter_af_afade_outputs,

  361.     .priv_class    = &afade_class,

  362.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,

  363. };

  364. 

  365. #endif /* CONFIG_AFADE_FILTER */

  366. 

  367. #if CONFIG_ACROSSFADE_FILTER

  368. 

  369. static const AVOption acrossfade_options[] = {

  370.     { "nb_samples",   "set number of samples for cross fade duration", OFFSET(nb_samples),   AV_OPT_TYPE_INT,    {.i64 = 44100}, 1, INT32_MAX/10, FLAGS },

  371.     { "ns",           "set number of samples for cross fade duration", OFFSET(nb_samples),   AV_OPT_TYPE_INT,    {.i64 = 44100}, 1, INT32_MAX/10, FLAGS },

  372.     { "duration",     "set cross fade duration",                       OFFSET(duration),     AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, 60000000, FLAGS },

  373.     { "d",            "set cross fade duration",                       OFFSET(duration),     AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, 60000000, FLAGS },

  374.     { "overlap",      "overlap 1st stream end with 2nd stream start",  OFFSET(overlap),      AV_OPT_TYPE_BOOL,   {.i64 = 1    }, 0,  1, FLAGS },

  375.     { "o",            "overlap 1st stream end with 2nd stream start",  OFFSET(overlap),      AV_OPT_TYPE_BOOL,   {.i64 = 1    }, 0,  1, FLAGS },

  376.     { "curve1",       "set fade curve type for 1st stream",            OFFSET(curve),        AV_OPT_TYPE_INT,    {.i64 = TRI  }, NONE, NB_CURVES - 1, FLAGS, "curve" },

  377.     { "c1",           "set fade curve type for 1st stream",            OFFSET(curve),        AV_OPT_TYPE_INT,    {.i64 = TRI  }, NONE, NB_CURVES - 1, FLAGS, "curve" },

  378.     {     "nofade",   "no fade; keep audio as-is",                     0,                    AV_OPT_TYPE_CONST,  {.i64 = NONE }, 0, 0, FLAGS, "curve" },

  379.     {     "tri",      "linear slope",                                  0,                    AV_OPT_TYPE_CONST,  {.i64 = TRI  }, 0, 0, FLAGS, "curve" },

  380.     {     "qsin",     "quarter of sine wave",                          0,                    AV_OPT_TYPE_CONST,  {.i64 = QSIN }, 0, 0, FLAGS, "curve" },

  381.     {     "esin",     "exponential sine wave",                         0,                    AV_OPT_TYPE_CONST,  {.i64 = ESIN }, 0, 0, FLAGS, "curve" },

  382.     {     "hsin",     "half of sine wave",                             0,                    AV_OPT_TYPE_CONST,  {.i64 = HSIN }, 0, 0, FLAGS, "curve" },

  383.     {     "log",      "logarithmic",                                   0,                    AV_OPT_TYPE_CONST,  {.i64 = LOG  }, 0, 0, FLAGS, "curve" },

  384.     {     "ipar",     "inverted parabola",                             0,                    AV_OPT_TYPE_CONST,  {.i64 = IPAR }, 0, 0, FLAGS, "curve" },

  385.     {     "qua",      "quadratic",                                     0,                    AV_OPT_TYPE_CONST,  {.i64 = QUA  }, 0, 0, FLAGS, "curve" },

  386.     {     "cub",      "cubic",                                         0,                    AV_OPT_TYPE_CONST,  {.i64 = CUB  }, 0, 0, FLAGS, "curve" },

  387.     {     "squ",      "square root",                                   0,                    AV_OPT_TYPE_CONST,  {.i64 = SQU  }, 0, 0, FLAGS, "curve" },

  388.     {     "cbr",      "cubic root",                                    0,                    AV_OPT_TYPE_CONST,  {.i64 = CBR  }, 0, 0, FLAGS, "curve" },

  389.     {     "par",      "parabola",                                      0,                    AV_OPT_TYPE_CONST,  {.i64 = PAR  }, 0, 0, FLAGS, "curve" },

  390.     {     "exp",      "exponential",                                   0,                    AV_OPT_TYPE_CONST,  {.i64 = EXP  }, 0, 0, FLAGS, "curve" },

  391.     {     "iqsin",    "inverted quarter of sine wave",                 0,                    AV_OPT_TYPE_CONST,  {.i64 = IQSIN}, 0, 0, FLAGS, "curve" },

  392.     {     "ihsin",    "inverted half of sine wave",                    0,                    AV_OPT_TYPE_CONST,  {.i64 = IHSIN}, 0, 0, FLAGS, "curve" },

  393.     {     "dese",     "double-exponential seat",                       0,                    AV_OPT_TYPE_CONST,  {.i64 = DESE }, 0, 0, FLAGS, "curve" },

  394.     {     "desi",     "double-exponential sigmoid",                    0,                    AV_OPT_TYPE_CONST,  {.i64 = DESI }, 0, 0, FLAGS, "curve" },

  395.     {     "losi",     "logistic sigmoid",                              0,                    AV_OPT_TYPE_CONST,  {.i64 = LOSI }, 0, 0, FLAGS, "curve" },

  396.     {     "sinc",     "sine cardinal function",                        0,                    AV_OPT_TYPE_CONST,  {.i64 = SINC }, 0, 0, FLAGS, "curve" },

  397.     {     "isinc",    "inverted sine cardinal function",               0,                    AV_OPT_TYPE_CONST,  {.i64 = ISINC}, 0, 0, FLAGS, "curve" },

  398.     { "curve2",       "set fade curve type for 2nd stream",            OFFSET(curve2),       AV_OPT_TYPE_INT,    {.i64 = TRI  }, NONE, NB_CURVES - 1, FLAGS, "curve" },

  399.     { "c2",           "set fade curve type for 2nd stream",            OFFSET(curve2),       AV_OPT_TYPE_INT,    {.i64 = TRI  }, NONE, NB_CURVES - 1, FLAGS, "curve" },

  400.     { NULL }

  401. };

  402. 

  403. AVFILTER_DEFINE_CLASS(acrossfade);

  404. 

  405. #define CROSSFADE_PLANAR(name, type)                                           \

  406. static void crossfade_samples_## name ##p(uint8_t **dst, uint8_t * const *cf0, \

  407.                                           uint8_t * const *cf1,                \

  408.                                           int nb_samples, int channels,        \

  409.                                           int curve0, int curve1)              \

  410. {                                                                              \

  411.     int i, c;                                                                  \

  412.                                                                                \

  413.     for (i = 0; i < nb_samples; i++) {                                         \

  414.         double gain0 = fade_gain(curve0, nb_samples - 1 - i, nb_samples);      \

  415.         double gain1 = fade_gain(curve1, i, nb_samples);                       \

  416.         for (c = 0; c < channels; c++) {                                       \

  417.             type *d = (type *)dst[c];                                          \

  418.             const type *s0 = (type *)cf0[c];                                   \

  419.             const type *s1 = (type *)cf1[c];                                   \

  420.                                                                                \

  421.             d[i] = s0[i] * gain0 + s1[i] * gain1;                              \

  422.         }                                                                      \

  423.     }                                                                          \

  424. }

  425. 

  426. #define CROSSFADE(name, type)                                               \

  427. static void crossfade_samples_## name (uint8_t **dst, uint8_t * const *cf0, \

  428.                                        uint8_t * const *cf1,                \

  429.                                        int nb_samples, int channels,        \

  430.                                        int curve0, int curve1)              \

  431. {                                                                           \

  432.     type *d = (type *)dst[0];                                               \

  433.     const type *s0 = (type *)cf0[0];                                        \

  434.     const type *s1 = (type *)cf1[0];                                        \

  435.     int i, c, k = 0;                                                        \

  436.                                                                             \

  437.     for (i = 0; i < nb_samples; i++) {                                      \

  438.         double gain0 = fade_gain(curve0, nb_samples - 1 - i, nb_samples);   \

  439.         double gain1 = fade_gain(curve1, i, nb_samples);                    \

  440.         for (c = 0; c < channels; c++, k++)                                 \

  441.             d[k] = s0[k] * gain0 + s1[k] * gain1;                           \

  442.     }                                                                       \

  443. }

  444. 

  445. CROSSFADE_PLANAR(dbl, double)

  446. CROSSFADE_PLANAR(flt, float)

  447. CROSSFADE_PLANAR(s16, int16_t)

  448. CROSSFADE_PLANAR(s32, int32_t)

  449. 

  450. CROSSFADE(dbl, double)

  451. CROSSFADE(flt, float)

  452. CROSSFADE(s16, int16_t)

  453. CROSSFADE(s32, int32_t)

  454. 

  455. static int activate(AVFilterContext *ctx)

  456. {

  457.     AudioFadeContext *s   = ctx->priv;

  458.     AVFilterLink *outlink = ctx->outputs[0];

  459.     AVFrame *in = NULL, *out, *cf[2] = { NULL };

  460.     int ret = 0, nb_samples, status;

  461.     int64_t pts;

  462. 

  463.     FF_FILTER_FORWARD_STATUS_BACK_ALL(outlink, ctx);

  464. 

  465.     if (s->crossfade_is_over) {

  466.         ret = ff_inlink_consume_frame(ctx->inputs[1], &in);

  467.         if (ret > 0) {

  468.             in->pts = s->pts;

  469.             s->pts += av_rescale_q(in->nb_samples,

  470.                       (AVRational){ 1, outlink->sample_rate }, outlink->time_base);

  471.             return ff_filter_frame(outlink, in);

  472.         } else if (ret < 0) {

  473.             return ret;

  474.         } else if (ff_inlink_acknowledge_status(ctx->inputs[1], &status, &pts)) {

  475.             ff_outlink_set_status(ctx->outputs[0], status, pts);

  476.             return 0;

  477.         } else if (!ret) {

  478.             if (ff_outlink_frame_wanted(ctx->outputs[0])) {

  479.                 ff_inlink_request_frame(ctx->inputs[1]);

  480.                 return 0;

  481.             }

  482.         }

  483.     }

  484. 

  485.     if (ff_inlink_queued_samples(ctx->inputs[0]) > s->nb_samples) {

  486.         nb_samples = ff_inlink_queued_samples(ctx->inputs[0]) - s->nb_samples;

  487.         if (nb_samples > 0) {

  488.             ret = ff_inlink_consume_samples(ctx->inputs[0], nb_samples, nb_samples, &in);

  489.             if (ret < 0) {

  490.                 return ret;

  491.             }

  492.         }

  493.         in->pts = s->pts;

  494.         s->pts += av_rescale_q(in->nb_samples,

  495.             (AVRational){ 1, outlink->sample_rate }, outlink->time_base);

  496.         return ff_filter_frame(outlink, in);

  497.     } else if (ff_inlink_queued_samples(ctx->inputs[0]) >= s->nb_samples &&

  498.                ff_inlink_queued_samples(ctx->inputs[1]) >= s->nb_samples && s->cf0_eof) {

  499.         if (s->overlap) {

  500.             out = ff_get_audio_buffer(outlink, s->nb_samples);

  501.             if (!out)

  502.                 return AVERROR(ENOMEM);

  503. 

  504.             ret = ff_inlink_consume_samples(ctx->inputs[0], s->nb_samples, s->nb_samples, &cf[0]);

  505.             if (ret < 0) {

  506.                 av_frame_free(&out);

  507.                 return ret;

  508.             }

  509. 

  510.             ret = ff_inlink_consume_samples(ctx->inputs[1], s->nb_samples, s->nb_samples, &cf[1]);

  511.             if (ret < 0) {

  512.                 av_frame_free(&out);

  513.                 return ret;

  514.             }

  515. 

  516.             s->crossfade_samples(out->extended_data, cf[0]->extended_data,

  517.                                  cf[1]->extended_data,

  518.                                  s->nb_samples, out->channels,

  519.                                  s->curve, s->curve2);

  520.             out->pts = s->pts;

  521.             s->pts += av_rescale_q(s->nb_samples,

  522.                 (AVRational){ 1, outlink->sample_rate }, outlink->time_base);

  523.             s->crossfade_is_over = 1;

  524.             av_frame_free(&cf[0]);

  525.             av_frame_free(&cf[1]);

  526.             return ff_filter_frame(outlink, out);

  527.         } else {

  528.             out = ff_get_audio_buffer(outlink, s->nb_samples);

  529.             if (!out)

  530.                 return AVERROR(ENOMEM);

  531. 

  532.             ret = ff_inlink_consume_samples(ctx->inputs[0], s->nb_samples, s->nb_samples, &cf[0]);

  533.             if (ret < 0) {

  534.                 av_frame_free(&out);

  535.                 return ret;

  536.             }

  537. 

  538.             s->fade_samples(out->extended_data, cf[0]->extended_data, s->nb_samples,

  539.                             outlink->channels, -1, s->nb_samples - 1, s->nb_samples, s->curve);

  540.             out->pts = s->pts;

  541.             s->pts += av_rescale_q(s->nb_samples,

  542.                 (AVRational){ 1, outlink->sample_rate }, outlink->time_base);

  543.             av_frame_free(&cf[0]);

  544.             ret = ff_filter_frame(outlink, out);

  545.             if (ret < 0)

  546.                 return ret;

  547. 

  548.             out = ff_get_audio_buffer(outlink, s->nb_samples);

  549.             if (!out)

  550.                 return AVERROR(ENOMEM);

  551. 

  552.             ret = ff_inlink_consume_samples(ctx->inputs[1], s->nb_samples, s->nb_samples, &cf[1]);

  553.             if (ret < 0) {

  554.                 av_frame_free(&out);

  555.                 return ret;

  556.             }

  557. 

  558.             s->fade_samples(out->extended_data, cf[1]->extended_data, s->nb_samples,

  559.                             outlink->channels, 1, 0, s->nb_samples, s->curve2);

  560.             out->pts = s->pts;

  561.             s->pts += av_rescale_q(s->nb_samples,

  562.                 (AVRational){ 1, outlink->sample_rate }, outlink->time_base);

  563.             s->crossfade_is_over = 1;

  564.             av_frame_free(&cf[1]);

  565.             return ff_filter_frame(outlink, out);

  566.         }

  567.     } else if (ff_outlink_frame_wanted(ctx->outputs[0])) {

  568.         if (!s->cf0_eof && ff_outlink_get_status(ctx->inputs[0])) {

  569.             s->cf0_eof = 1;

  570.         }

  571.         if (ff_outlink_get_status(ctx->inputs[1])) {

  572.             ff_outlink_set_status(ctx->outputs[0], AVERROR_EOF, AV_NOPTS_VALUE);

  573.             return 0;

  574.         }

  575.         if (!s->cf0_eof)

  576.             ff_inlink_request_frame(ctx->inputs[0]);

  577.         else

  578.             ff_inlink_request_frame(ctx->inputs[1]);

  579.         return 0;

  580.     }

  581. 

  582.     return ret;

  583. }

  584. 

  585. static int acrossfade_config_output(AVFilterLink *outlink)

  586. {

  587.     AVFilterContext *ctx = outlink->src;

  588.     AudioFadeContext *s  = ctx->priv;

  589. 

  590.     if (ctx->inputs[0]->sample_rate != ctx->inputs[1]->sample_rate) {

  591.         av_log(ctx, AV_LOG_ERROR,

  592.                "Inputs must have the same sample rate "

  593.                "%d for in0 vs %d for in1\n",

  594.                ctx->inputs[0]->sample_rate, ctx->inputs[1]->sample_rate);

  595.         return AVERROR(EINVAL);

  596.     }

  597. 

  598.     outlink->sample_rate = ctx->inputs[0]->sample_rate;

  599.     outlink->time_base   = ctx->inputs[0]->time_base;

  600.     outlink->channel_layout = ctx->inputs[0]->channel_layout;

  601.     outlink->channels = ctx->inputs[0]->channels;

  602. 

  603.     switch (outlink->format) {

  604.     case AV_SAMPLE_FMT_DBL:  s->crossfade_samples = crossfade_samples_dbl;  break;

  605.     case AV_SAMPLE_FMT_DBLP: s->crossfade_samples = crossfade_samples_dblp; break;

  606.     case AV_SAMPLE_FMT_FLT:  s->crossfade_samples = crossfade_samples_flt;  break;

  607.     case AV_SAMPLE_FMT_FLTP: s->crossfade_samples = crossfade_samples_fltp; break;

  608.     case AV_SAMPLE_FMT_S16:  s->crossfade_samples = crossfade_samples_s16;  break;

  609.     case AV_SAMPLE_FMT_S16P: s->crossfade_samples = crossfade_samples_s16p; break;

  610.     case AV_SAMPLE_FMT_S32:  s->crossfade_samples = crossfade_samples_s32;  break;

  611.     case AV_SAMPLE_FMT_S32P: s->crossfade_samples = crossfade_samples_s32p; break;

  612.     }

  613. 

  614.     config_output(outlink);

  615. 

  616.     return 0;

  617. }

  618. 

  619. static const AVFilterPad avfilter_af_acrossfade_inputs[] = {

  620.     {

  621.         .name         = "crossfade0",

  622.         .type         = AVMEDIA_TYPE_AUDIO,

  623.     },

  624.     {

  625.         .name         = "crossfade1",

  626.         .type         = AVMEDIA_TYPE_AUDIO,

  627.     },

  628.     { NULL }

  629. };

  630. 

  631. static const AVFilterPad avfilter_af_acrossfade_outputs[] = {

  632.     {

  633.         .name          = "default",

  634.         .type          = AVMEDIA_TYPE_AUDIO,

  635.         .config_props  = acrossfade_config_output,

  636.     },

  637.     { NULL }

  638. };

  639. 

  640. AVFilter ff_af_acrossfade = {

  641.     .name          = "acrossfade",

  642.     .description   = NULL_IF_CONFIG_SMALL("Cross fade two input audio streams."),

  643.     .query_formats = query_formats,

  644.     .priv_size     = sizeof(AudioFadeContext),

  645.     .activate      = activate,

  646.     .priv_class    = &acrossfade_class,

  647.     .inputs        = avfilter_af_acrossfade_inputs,

  648.     .outputs       = avfilter_af_acrossfade_outputs,

  649. };

  650. 

  651. #endif /* CONFIG_ACROSSFADE_FILTER */