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FFmpeg/libavfilter/af_afade.c

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  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. #define TFLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM

  59. 

  60. static int query_formats(AVFilterContext *ctx)

  61. {

  62.     AVFilterFormats *formats;

  63.     AVFilterChannelLayouts *layouts;

  64.     static const enum AVSampleFormat sample_fmts[] = {

  65.         AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S16P,

  66.         AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_S32P,

  67.         AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_FLTP,

  68.         AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_DBLP,

  69.         AV_SAMPLE_FMT_NONE

  70.     };

  71.     int ret;

  72. 

  73.     layouts = ff_all_channel_counts();

  74.     if (!layouts)

  75.         return AVERROR(ENOMEM);

  76.     ret = ff_set_common_channel_layouts(ctx, layouts);

  77.     if (ret < 0)

  78.         return ret;

  79. 

  80.     formats = ff_make_format_list(sample_fmts);

  81.     if (!formats)

  82.         return AVERROR(ENOMEM);

  83.     ret = ff_set_common_formats(ctx, formats);

  84.     if (ret < 0)

  85.         return ret;

  86. 

  87.     formats = ff_all_samplerates();

  88.     if (!formats)

  89.         return AVERROR(ENOMEM);

  90.     return ff_set_common_samplerates(ctx, formats);

  91. }

  92. 

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

  94. {

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

  96.     double gain;

  97. 

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

  99. 

  100.     switch (curve) {

  101.     case QSIN:

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

  103.         break;

  104.     case IQSIN:

  105.         /* 0.6... = 2 / M_PI */

  106.         gain = 0.6366197723675814 * asin(gain);

  107.         break;

  108.     case ESIN:

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

  110.         break;

  111.     case HSIN:

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

  113.         break;

  114.     case IHSIN:

  115.         /* 0.3... = 1 / M_PI */

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

  117.         break;

  118.     case EXP:

  119.         /* -11.5... = 5*ln(0.1) */

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

  121.         break;

  122.     case LOG:

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

  124.         break;

  125.     case PAR:

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

  127.         break;

  128.     case IPAR:

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

  130.         break;

  131.     case QUA:

  132.         gain *= gain;

  133.         break;

  134.     case CUB:

  135.         gain = CUBE(gain);

  136.         break;

  137.     case SQU:

  138.         gain = sqrt(gain);

  139.         break;

  140.     case CBR:

  141.         gain = cbrt(gain);

  142.         break;

  143.     case DESE:

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

  145.         break;

  146.     case DESI:

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

  148.         break;

  149.     case LOSI: {

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

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

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

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

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

  155.                }

  156.         break;

  157.     case SINC:

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

  159.         break;

  160.     case ISINC:

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

  162.         break;

  163.     case NONE:

  164.         gain = 1.0;

  165.         break;

  166.     }

  167. 

  168.     return gain;

  169. }

  170. 

  171. #define FADE_PLANAR(name, type)                                             \

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

  173.                                      int nb_samples, int channels, int dir, \

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

  175. {                                                                           \

  176.     int i, c;                                                               \

  177.                                                                             \

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

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

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

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

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

  183.                                                                             \

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

  185.         }                                                                   \

  186.     }                                                                       \

  187. }

  188. 

  189. #define FADE(name, type)                                                    \

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

  191.                                   int nb_samples, int channels, int dir,    \

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

  193. {                                                                           \

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

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

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

  197.                                                                             \

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

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

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

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

  202.     }                                                                       \

  203. }

  204. 

  205. FADE_PLANAR(dbl, double)

  206. FADE_PLANAR(flt, float)

  207. FADE_PLANAR(s16, int16_t)

  208. FADE_PLANAR(s32, int32_t)

  209. 

  210. FADE(dbl, double)

  211. FADE(flt, float)

  212. FADE(s16, int16_t)

  213. FADE(s32, int32_t)

  214. 

  215. static int config_output(AVFilterLink *outlink)

  216. {

  217.     AVFilterContext *ctx = outlink->src;

  218.     AudioFadeContext *s  = ctx->priv;

  219. 

  220.     switch (outlink->format) {

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

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

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

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

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

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

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

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

  229.     }

  230. 

  231.     if (s->duration)

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

  233.     s->duration = 0;

  234.     if (s->start_time)

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

  236.     s->start_time = 0;

  237. 

  238.     return 0;

  239. }

  240. 

  241. #if CONFIG_AFADE_FILTER

  242. 

  243. static const AVOption afade_options[] = {

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

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

  246.     { "in",           "fade-in",                                     0,                    AV_OPT_TYPE_CONST,  {.i64 = 0    }, 0, 0, TFLAGS, "type" },

  247.     { "out",          "fade-out",                                    0,                    AV_OPT_TYPE_CONST,  {.i64 = 1    }, 0, 0, TFLAGS, "type" },

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

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

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

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

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

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

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

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

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

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

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

  259.     { "tri",          "linear slope",                                0,                    AV_OPT_TYPE_CONST,  {.i64 = TRI  }, 0, 0, TFLAGS, "curve" },

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

  261.     { "esin",         "exponential sine wave",                       0,                    AV_OPT_TYPE_CONST,  {.i64 = ESIN }, 0, 0, TFLAGS, "curve" },

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

  263.     { "log",          "logarithmic",                                 0,                    AV_OPT_TYPE_CONST,  {.i64 = LOG  }, 0, 0, TFLAGS, "curve" },

  264.     { "ipar",         "inverted parabola",                           0,                    AV_OPT_TYPE_CONST,  {.i64 = IPAR }, 0, 0, TFLAGS, "curve" },

  265.     { "qua",          "quadratic",                                   0,                    AV_OPT_TYPE_CONST,  {.i64 = QUA  }, 0, 0, TFLAGS, "curve" },

  266.     { "cub",          "cubic",                                       0,                    AV_OPT_TYPE_CONST,  {.i64 = CUB  }, 0, 0, TFLAGS, "curve" },

  267.     { "squ",          "square root",                                 0,                    AV_OPT_TYPE_CONST,  {.i64 = SQU  }, 0, 0, TFLAGS, "curve" },

  268.     { "cbr",          "cubic root",                                  0,                    AV_OPT_TYPE_CONST,  {.i64 = CBR  }, 0, 0, TFLAGS, "curve" },

  269.     { "par",          "parabola",                                    0,                    AV_OPT_TYPE_CONST,  {.i64 = PAR  }, 0, 0, TFLAGS, "curve" },

  270.     { "exp",          "exponential",                                 0,                    AV_OPT_TYPE_CONST,  {.i64 = EXP  }, 0, 0, TFLAGS, "curve" },

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

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

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

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

  275.     { "losi",         "logistic sigmoid",                            0,                    AV_OPT_TYPE_CONST,  {.i64 = LOSI }, 0, 0, TFLAGS, "curve" },

  276.     { "sinc",         "sine cardinal function",                      0,                    AV_OPT_TYPE_CONST,  {.i64 = SINC }, 0, 0, TFLAGS, "curve" },

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

  278.     { NULL }

  279. };

  280. 

  281. AVFILTER_DEFINE_CLASS(afade);

  282. 

  283. static av_cold int init(AVFilterContext *ctx)

  284. {

  285.     AudioFadeContext *s = ctx->priv;

  286. 

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

  288.         return AVERROR(EINVAL);

  289. 

  290.     return 0;

  291. }

  292. 

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

  294. {

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

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

  297.     int nb_samples          = buf->nb_samples;

  298.     AVFrame *out_buf;

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

  300. 

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

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

  303.         return ff_filter_frame(outlink, buf);

  304. 

  305.     if (av_frame_is_writable(buf)) {

  306.         out_buf = buf;

  307.     } else {

  308.         out_buf = ff_get_audio_buffer(outlink, nb_samples);

  309.         if (!out_buf)

  310.             return AVERROR(ENOMEM);

  311.         av_frame_copy_props(out_buf, buf);

  312.     }

  313. 

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

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

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

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

  318.     } else {

  319.         int64_t start;

  320. 

  321.         if (!s->type)

  322.             start = cur_sample - s->start_sample;

  323.         else

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

  325. 

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

  327.                         nb_samples, buf->channels,

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

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

  330.     }

  331. 

  332.     if (buf != out_buf)

  333.         av_frame_free(&buf);

  334. 

  335.     return ff_filter_frame(outlink, out_buf);

  336. }

  337. 

  338. static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,

  339.                            char *res, int res_len, int flags)

  340. {

  341.     int ret;

  342. 

  343.     ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);

  344.     if (ret < 0)

  345.         return ret;

  346. 

  347.     return config_output(ctx->outputs[0]);

  348. }

  349. 

  350. static const AVFilterPad avfilter_af_afade_inputs[] = {

  351.     {

  352.         .name         = "default",

  353.         .type         = AVMEDIA_TYPE_AUDIO,

  354.         .filter_frame = filter_frame,

  355.     },

  356.     { NULL }

  357. };

  358. 

  359. static const AVFilterPad avfilter_af_afade_outputs[] = {

  360.     {

  361.         .name         = "default",

  362.         .type         = AVMEDIA_TYPE_AUDIO,

  363.         .config_props = config_output,

  364.     },

  365.     { NULL }

  366. };

  367. 

  368. AVFilter ff_af_afade = {

  369.     .name          = "afade",

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

  371.     .query_formats = query_formats,

  372.     .priv_size     = sizeof(AudioFadeContext),

  373.     .init          = init,

  374.     .inputs        = avfilter_af_afade_inputs,

  375.     .outputs       = avfilter_af_afade_outputs,

  376.     .priv_class    = &afade_class,

  377.     .process_command = process_command,

  378.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,

  379. };

  380. 

  381. #endif /* CONFIG_AFADE_FILTER */

  382. 

  383. #if CONFIG_ACROSSFADE_FILTER

  384. 

  385. static const AVOption acrossfade_options[] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  416.     { NULL }

  417. };

  418. 

  419. AVFILTER_DEFINE_CLASS(acrossfade);

  420. 

  421. #define CROSSFADE_PLANAR(name, type)                                           \

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

  423.                                           uint8_t * const *cf1,                \

  424.                                           int nb_samples, int channels,        \

  425.                                           int curve0, int curve1)              \

  426. {                                                                              \

  427.     int i, c;                                                                  \

  428.                                                                                \

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

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

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

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

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

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

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

  436.                                                                                \

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

  438.         }                                                                      \

  439.     }                                                                          \

  440. }

  441. 

  442. #define CROSSFADE(name, type)                                               \

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

  444.                                        uint8_t * const *cf1,                \

  445.                                        int nb_samples, int channels,        \

  446.                                        int curve0, int curve1)              \

  447. {                                                                           \

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

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

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

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

  452.                                                                             \

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

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

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

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

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

  458.     }                                                                       \

  459. }

  460. 

  461. CROSSFADE_PLANAR(dbl, double)

  462. CROSSFADE_PLANAR(flt, float)

  463. CROSSFADE_PLANAR(s16, int16_t)

  464. CROSSFADE_PLANAR(s32, int32_t)

  465. 

  466. CROSSFADE(dbl, double)

  467. CROSSFADE(flt, float)

  468. CROSSFADE(s16, int16_t)

  469. CROSSFADE(s32, int32_t)

  470. 

  471. static int activate(AVFilterContext *ctx)

  472. {

  473.     AudioFadeContext *s   = ctx->priv;

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

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

  476.     int ret = 0, nb_samples, status;

  477.     int64_t pts;

  478. 

  479.     FF_FILTER_FORWARD_STATUS_BACK_ALL(outlink, ctx);

  480. 

  481.     if (s->crossfade_is_over) {

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

  483.         if (ret > 0) {

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

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

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

  487.             return ff_filter_frame(outlink, in);

  488.         } else if (ret < 0) {

  489.             return ret;

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

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

  492.             return 0;

  493.         } else if (!ret) {

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

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

  496.                 return 0;

  497.             }

  498.         }

  499.     }

  500. 

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

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

  503.         if (nb_samples > 0) {

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

  505.             if (ret < 0) {

  506.                 return ret;

  507.             }

  508.         }

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

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

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

  512.         return ff_filter_frame(outlink, in);

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

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

  515.         if (s->overlap) {

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

  517.             if (!out)

  518.                 return AVERROR(ENOMEM);

  519. 

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

  521.             if (ret < 0) {

  522.                 av_frame_free(&out);

  523.                 return ret;

  524.             }

  525. 

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

  527.             if (ret < 0) {

  528.                 av_frame_free(&out);

  529.                 return ret;

  530.             }

  531. 

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

  533.                                  cf[1]->extended_data,

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

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

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

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

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

  539.             s->crossfade_is_over = 1;

  540.             av_frame_free(&cf[0]);

  541.             av_frame_free(&cf[1]);

  542.             return ff_filter_frame(outlink, out);

  543.         } else {

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

  545.             if (!out)

  546.                 return AVERROR(ENOMEM);

  547. 

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

  549.             if (ret < 0) {

  550.                 av_frame_free(&out);

  551.                 return ret;

  552.             }

  553. 

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

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

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

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

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

  559.             av_frame_free(&cf[0]);

  560.             ret = ff_filter_frame(outlink, out);

  561.             if (ret < 0)

  562.                 return ret;

  563. 

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

  565.             if (!out)

  566.                 return AVERROR(ENOMEM);

  567. 

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

  569.             if (ret < 0) {

  570.                 av_frame_free(&out);

  571.                 return ret;

  572.             }

  573. 

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

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

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

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

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

  579.             s->crossfade_is_over = 1;

  580.             av_frame_free(&cf[1]);

  581.             return ff_filter_frame(outlink, out);

  582.         }

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

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

  585.             s->cf0_eof = 1;

  586.         }

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

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

  589.             return 0;

  590.         }

  591.         if (!s->cf0_eof)

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

  593.         else

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

  595.         return 0;

  596.     }

  597. 

  598.     return ret;

  599. }

  600. 

  601. static int acrossfade_config_output(AVFilterLink *outlink)

  602. {

  603.     AVFilterContext *ctx = outlink->src;

  604.     AudioFadeContext *s  = ctx->priv;

  605. 

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

  607.         av_log(ctx, AV_LOG_ERROR,

  608.                "Inputs must have the same sample rate "

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

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

  611.         return AVERROR(EINVAL);

  612.     }

  613. 

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

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

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

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

  618. 

  619.     switch (outlink->format) {

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

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

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

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

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

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

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

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

  628.     }

  629. 

  630.     config_output(outlink);

  631. 

  632.     return 0;

  633. }

  634. 

  635. static const AVFilterPad avfilter_af_acrossfade_inputs[] = {

  636.     {

  637.         .name         = "crossfade0",

  638.         .type         = AVMEDIA_TYPE_AUDIO,

  639.     },

  640.     {

  641.         .name         = "crossfade1",

  642.         .type         = AVMEDIA_TYPE_AUDIO,

  643.     },

  644.     { NULL }

  645. };

  646. 

  647. static const AVFilterPad avfilter_af_acrossfade_outputs[] = {

  648.     {

  649.         .name          = "default",

  650.         .type          = AVMEDIA_TYPE_AUDIO,

  651.         .config_props  = acrossfade_config_output,

  652.     },

  653.     { NULL }

  654. };

  655. 

  656. AVFilter ff_af_acrossfade = {

  657.     .name          = "acrossfade",

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

  659.     .query_formats = query_formats,

  660.     .priv_size     = sizeof(AudioFadeContext),

  661.     .activate      = activate,

  662.     .priv_class    = &acrossfade_class,

  663.     .inputs        = avfilter_af_acrossfade_inputs,

  664.     .outputs       = avfilter_af_acrossfade_outputs,

  665. };

  666. 

  667. #endif /* CONFIG_ACROSSFADE_FILTER */