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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/audio_fifo.h"

  27. #include "libavutil/opt.h"

  28. #include "audio.h"

  29. #include "avfilter.h"

  30. #include "internal.h"

  31. 

  32. typedef struct {

  33.     const AVClass *class;

  34.     int type;

  35.     int curve, curve2;

  36.     int 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.     AVAudioFifo *fifo[2];

  44.     int64_t pts;

  45. 

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

  47.                          int nb_samples, int channels, int direction,

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

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

  50.                               uint8_t * const *cf1,

  51.                               int nb_samples, int channels,

  52.                               int curve0, int curve1);

  53. } AudioFadeContext;

  54. 

  55. enum CurveType { TRI, QSIN, ESIN, HSIN, LOG, IPAR, QUA, CUB, SQU, CBR, PAR, EXP, IQSIN, IHSIN, DESE, DESI, NB_CURVES };

  56. 

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

  58. #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_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, int 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.     }

  150. 

  151.     return gain;

  152. }

  153. 

  154. #define FADE_PLANAR(name, type)                                             \

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

  156.                                      int nb_samples, int channels, int dir, \

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

  158. {                                                                           \

  159.     int i, c;                                                               \

  160.                                                                             \

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

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

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

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

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

  166.                                                                             \

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

  168.         }                                                                   \

  169.     }                                                                       \

  170. }

  171. 

  172. #define FADE(name, type)                                                    \

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

  174.                                   int nb_samples, int channels, int dir,    \

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

  176. {                                                                           \

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

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

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

  180.                                                                             \

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

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

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

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

  185.     }                                                                       \

  186. }

  187. 

  188. FADE_PLANAR(dbl, double)

  189. FADE_PLANAR(flt, float)

  190. FADE_PLANAR(s16, int16_t)

  191. FADE_PLANAR(s32, int32_t)

  192. 

  193. FADE(dbl, double)

  194. FADE(flt, float)

  195. FADE(s16, int16_t)

  196. FADE(s32, int32_t)

  197. 

  198. static int config_output(AVFilterLink *outlink)

  199. {

  200.     AVFilterContext *ctx = outlink->src;

  201.     AudioFadeContext *s  = ctx->priv;

  202. 

  203.     switch (outlink->format) {

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

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

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

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

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

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

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

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

  212.     }

  213. 

  214.     if (s->duration)

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

  216.     if (s->start_time)

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

  218. 

  219.     return 0;

  220. }

  221. 

  222. #if CONFIG_AFADE_FILTER

  223. 

  224. static const AVOption afade_options[] = {

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

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

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

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

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

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

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

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

  233.     { "start_time",   "set time to start fading",                    OFFSET(start_time),   AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },

  234.     { "st",           "set time to start fading",                    OFFSET(start_time),   AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },

  235.     { "duration",     "set fade duration",                           OFFSET(duration),     AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },

  236.     { "d",            "set fade duration",                           OFFSET(duration),     AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },

  237.     { "curve",        "set fade curve type",                         OFFSET(curve),        AV_OPT_TYPE_INT,    {.i64 = TRI  }, 0, NB_CURVES - 1, FLAGS, "curve" },

  238.     { "c",            "set fade curve type",                         OFFSET(curve),        AV_OPT_TYPE_INT,    {.i64 = TRI  }, 0, NB_CURVES - 1, FLAGS, "curve" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  255.     { NULL }

  256. };

  257. 

  258. AVFILTER_DEFINE_CLASS(afade);

  259. 

  260. static av_cold int init(AVFilterContext *ctx)

  261. {

  262.     AudioFadeContext *s = ctx->priv;

  263. 

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

  265.         return AVERROR(EINVAL);

  266. 

  267.     return 0;

  268. }

  269. 

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

  271. {

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

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

  274.     int nb_samples          = buf->nb_samples;

  275.     AVFrame *out_buf;

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

  277. 

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

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

  280.         return ff_filter_frame(outlink, buf);

  281. 

  282.     if (av_frame_is_writable(buf)) {

  283.         out_buf = buf;

  284.     } else {

  285.         out_buf = ff_get_audio_buffer(inlink, nb_samples);

  286.         if (!out_buf)

  287.             return AVERROR(ENOMEM);

  288.         av_frame_copy_props(out_buf, buf);

  289.     }

  290. 

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

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

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

  294.                                av_frame_get_channels(out_buf), out_buf->format);

  295.     } else {

  296.         int64_t start;

  297. 

  298.         if (!s->type)

  299.             start = cur_sample - s->start_sample;

  300.         else

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

  302. 

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

  304.                         nb_samples, av_frame_get_channels(buf),

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

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

  307.     }

  308. 

  309.     if (buf != out_buf)

  310.         av_frame_free(&buf);

  311. 

  312.     return ff_filter_frame(outlink, out_buf);

  313. }

  314. 

  315. static const AVFilterPad avfilter_af_afade_inputs[] = {

  316.     {

  317.         .name         = "default",

  318.         .type         = AVMEDIA_TYPE_AUDIO,

  319.         .filter_frame = filter_frame,

  320.     },

  321.     { NULL }

  322. };

  323. 

  324. static const AVFilterPad avfilter_af_afade_outputs[] = {

  325.     {

  326.         .name         = "default",

  327.         .type         = AVMEDIA_TYPE_AUDIO,

  328.         .config_props = config_output,

  329.     },

  330.     { NULL }

  331. };

  332. 

  333. AVFilter ff_af_afade = {

  334.     .name          = "afade",

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

  336.     .query_formats = query_formats,

  337.     .priv_size     = sizeof(AudioFadeContext),

  338.     .init          = init,

  339.     .inputs        = avfilter_af_afade_inputs,

  340.     .outputs       = avfilter_af_afade_outputs,

  341.     .priv_class    = &afade_class,

  342.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,

  343. };

  344. 

  345. #endif /* CONFIG_AFADE_FILTER */

  346. 

  347. #if CONFIG_ACROSSFADE_FILTER

  348. 

  349. static const AVOption acrossfade_options[] = {

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

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

  352.     { "duration",     "set cross fade duration",                       OFFSET(duration),     AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, 60, FLAGS },

  353.     { "d",            "set cross fade duration",                       OFFSET(duration),     AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, 60, FLAGS },

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

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

  356.     { "curve1",       "set fade curve type for 1st stream",            OFFSET(curve),        AV_OPT_TYPE_INT,    {.i64 = TRI  }, 0, NB_CURVES - 1, FLAGS, "curve1" },

  357.     { "c1",           "set fade curve type for 1st stream",            OFFSET(curve),        AV_OPT_TYPE_INT,    {.i64 = TRI  }, 0, NB_CURVES - 1, FLAGS, "curve1" },

  358.     {     "tri",      "linear slope",                                  0,                    AV_OPT_TYPE_CONST,  {.i64 = TRI  }, 0, 0, FLAGS, "curve1" },

  359.     {     "qsin",     "quarter of sine wave",                          0,                    AV_OPT_TYPE_CONST,  {.i64 = QSIN }, 0, 0, FLAGS, "curve1" },

  360.     {     "esin",     "exponential sine wave",                         0,                    AV_OPT_TYPE_CONST,  {.i64 = ESIN }, 0, 0, FLAGS, "curve1" },

  361.     {     "hsin",     "half of sine wave",                             0,                    AV_OPT_TYPE_CONST,  {.i64 = HSIN }, 0, 0, FLAGS, "curve1" },

  362.     {     "log",      "logarithmic",                                   0,                    AV_OPT_TYPE_CONST,  {.i64 = LOG  }, 0, 0, FLAGS, "curve1" },

  363.     {     "ipar",     "inverted parabola",                             0,                    AV_OPT_TYPE_CONST,  {.i64 = IPAR }, 0, 0, FLAGS, "curve1" },

  364.     {     "qua",      "quadratic",                                     0,                    AV_OPT_TYPE_CONST,  {.i64 = QUA  }, 0, 0, FLAGS, "curve1" },

  365.     {     "cub",      "cubic",                                         0,                    AV_OPT_TYPE_CONST,  {.i64 = CUB  }, 0, 0, FLAGS, "curve1" },

  366.     {     "squ",      "square root",                                   0,                    AV_OPT_TYPE_CONST,  {.i64 = SQU  }, 0, 0, FLAGS, "curve1" },

  367.     {     "cbr",      "cubic root",                                    0,                    AV_OPT_TYPE_CONST,  {.i64 = CBR  }, 0, 0, FLAGS, "curve1" },

  368.     {     "par",      "parabola",                                      0,                    AV_OPT_TYPE_CONST,  {.i64 = PAR  }, 0, 0, FLAGS, "curve1" },

  369.     {     "exp",      "exponential",                                   0,                    AV_OPT_TYPE_CONST,  {.i64 = EXP  }, 0, 0, FLAGS, "curve1" },

  370.     {     "iqsin",    "inverted quarter of sine wave",                 0,                    AV_OPT_TYPE_CONST,  {.i64 = IQSIN}, 0, 0, FLAGS, "curve1" },

  371.     {     "ihsin",    "inverted half of sine wave",                    0,                    AV_OPT_TYPE_CONST,  {.i64 = IHSIN}, 0, 0, FLAGS, "curve1" },

  372.     {     "dese",     "double-exponential seat",                       0,                    AV_OPT_TYPE_CONST,  {.i64 = DESE }, 0, 0, FLAGS, "curve1" },

  373.     {     "desi",     "double-exponential sigmoid",                    0,                    AV_OPT_TYPE_CONST,  {.i64 = DESI }, 0, 0, FLAGS, "curve1" },

  374.     { "curve2",       "set fade curve type for 2nd stream",            OFFSET(curve2),       AV_OPT_TYPE_INT,    {.i64 = TRI  }, 0, NB_CURVES - 1, FLAGS, "curve2" },

  375.     { "c2",           "set fade curve type for 2nd stream",            OFFSET(curve2),       AV_OPT_TYPE_INT,    {.i64 = TRI  }, 0, NB_CURVES - 1, FLAGS, "curve2" },

  376.     {     "tri",      "linear slope",                                  0,                    AV_OPT_TYPE_CONST,  {.i64 = TRI  }, 0, 0, FLAGS, "curve2" },

  377.     {     "qsin",     "quarter of sine wave",                          0,                    AV_OPT_TYPE_CONST,  {.i64 = QSIN }, 0, 0, FLAGS, "curve2" },

  378.     {     "esin",     "exponential sine wave",                         0,                    AV_OPT_TYPE_CONST,  {.i64 = ESIN }, 0, 0, FLAGS, "curve2" },

  379.     {     "hsin",     "half of sine wave",                             0,                    AV_OPT_TYPE_CONST,  {.i64 = HSIN }, 0, 0, FLAGS, "curve2" },

  380.     {     "log",      "logarithmic",                                   0,                    AV_OPT_TYPE_CONST,  {.i64 = LOG  }, 0, 0, FLAGS, "curve2" },

  381.     {     "ipar",     "inverted parabola",                             0,                    AV_OPT_TYPE_CONST,  {.i64 = IPAR }, 0, 0, FLAGS, "curve2" },

  382.     {     "qua",      "quadratic",                                     0,                    AV_OPT_TYPE_CONST,  {.i64 = QUA  }, 0, 0, FLAGS, "curve2" },

  383.     {     "cub",      "cubic",                                         0,                    AV_OPT_TYPE_CONST,  {.i64 = CUB  }, 0, 0, FLAGS, "curve2" },

  384.     {     "squ",      "square root",                                   0,                    AV_OPT_TYPE_CONST,  {.i64 = SQU  }, 0, 0, FLAGS, "curve2" },

  385.     {     "cbr",      "cubic root",                                    0,                    AV_OPT_TYPE_CONST,  {.i64 = CBR  }, 0, 0, FLAGS, "curve2" },

  386.     {     "par",      "parabola",                                      0,                    AV_OPT_TYPE_CONST,  {.i64 = PAR  }, 0, 0, FLAGS, "curve2" },

  387.     {     "exp",      "exponential",                                   0,                    AV_OPT_TYPE_CONST,  {.i64 = EXP  }, 0, 0, FLAGS, "curve2" },

  388.     {     "iqsin",    "inverted quarter of sine wave",                 0,                    AV_OPT_TYPE_CONST,  {.i64 = IQSIN}, 0, 0, FLAGS, "curve2" },

  389.     {     "ihsin",    "inverted half of sine wave",                    0,                    AV_OPT_TYPE_CONST,  {.i64 = IHSIN}, 0, 0, FLAGS, "curve2" },

  390.     {     "dese",     "double-exponential seat",                       0,                    AV_OPT_TYPE_CONST,  {.i64 = DESE }, 0, 0, FLAGS, "curve2" },

  391.     {     "desi",     "double-exponential sigmoid",                    0,                    AV_OPT_TYPE_CONST,  {.i64 = DESI }, 0, 0, FLAGS, "curve2" },

  392.     { NULL }

  393. };

  394. 

  395. AVFILTER_DEFINE_CLASS(acrossfade);

  396. 

  397. #define CROSSFADE_PLANAR(name, type)                                           \

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

  399.                                           uint8_t * const *cf1,                \

  400.                                           int nb_samples, int channels,        \

  401.                                           int curve0, int curve1)              \

  402. {                                                                              \

  403.     int i, c;                                                                  \

  404.                                                                                \

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

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

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

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

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

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

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

  412.                                                                                \

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

  414.         }                                                                      \

  415.     }                                                                          \

  416. }

  417. 

  418. #define CROSSFADE(name, type)                                               \

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

  420.                                        uint8_t * const *cf1,                \

  421.                                        int nb_samples, int channels,        \

  422.                                        int curve0, int curve1)              \

  423. {                                                                           \

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

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

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

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

  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++, k++)                                 \

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

  434.     }                                                                       \

  435. }

  436. 

  437. CROSSFADE_PLANAR(dbl, double)

  438. CROSSFADE_PLANAR(flt, float)

  439. CROSSFADE_PLANAR(s16, int16_t)

  440. CROSSFADE_PLANAR(s32, int32_t)

  441. 

  442. CROSSFADE(dbl, double)

  443. CROSSFADE(flt, float)

  444. CROSSFADE(s16, int16_t)

  445. CROSSFADE(s32, int32_t)

  446. 

  447. static int acrossfade_filter_frame(AVFilterLink *inlink, AVFrame *in)

  448. {

  449.     AVFilterContext *ctx  = inlink->dst;

  450.     AudioFadeContext *s   = ctx->priv;

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

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

  453.     int ret = 0, nb_samples;

  454. 

  455.     if (s->crossfade_is_over) {

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

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

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

  459.         return ff_filter_frame(outlink, in);

  460.     } else if (inlink == ctx->inputs[0]) {

  461.         av_audio_fifo_write(s->fifo[0], (void **)in->extended_data, in->nb_samples);

  462. 

  463.         nb_samples = av_audio_fifo_size(s->fifo[0]) - s->nb_samples;

  464.         if (nb_samples > 0) {

  465.             out = ff_get_audio_buffer(outlink, nb_samples);

  466.             if (!out) {

  467.                 ret = AVERROR(ENOMEM);

  468.                 goto fail;

  469.             }

  470.             av_audio_fifo_read(s->fifo[0], (void **)out->extended_data, nb_samples);

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

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

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

  474.             ret = ff_filter_frame(outlink, out);

  475.         }

  476.     } else if (av_audio_fifo_size(s->fifo[1]) < s->nb_samples) {

  477.         if (!s->overlap && av_audio_fifo_size(s->fifo[0]) > 0) {

  478.             nb_samples = av_audio_fifo_size(s->fifo[0]);

  479. 

  480.             cf[0] = ff_get_audio_buffer(outlink, nb_samples);

  481.             out = ff_get_audio_buffer(outlink, nb_samples);

  482.             if (!out || !cf[0]) {

  483.                 ret = AVERROR(ENOMEM);

  484.                 goto fail;

  485.             }

  486.             av_audio_fifo_read(s->fifo[0], (void **)cf[0]->extended_data, nb_samples);

  487. 

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

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

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

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

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

  493.             ret = ff_filter_frame(outlink, out);

  494.             if (ret < 0)

  495.                 goto fail;

  496.         }

  497. 

  498.         av_audio_fifo_write(s->fifo[1], (void **)in->extended_data, in->nb_samples);

  499.     } else if (av_audio_fifo_size(s->fifo[1]) >= s->nb_samples) {

  500.         av_audio_fifo_write(s->fifo[1], (void **)in->extended_data, in->nb_samples);

  501. 

  502.         if (s->overlap) {

  503.             cf[0] = ff_get_audio_buffer(outlink, s->nb_samples);

  504.             cf[1] = ff_get_audio_buffer(outlink, s->nb_samples);

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

  506.             if (!out || !cf[0] || !cf[1]) {

  507.                 av_frame_free(&out);

  508.                 ret = AVERROR(ENOMEM);

  509.                 goto fail;

  510.             }

  511. 

  512.             av_audio_fifo_read(s->fifo[0], (void **)cf[0]->extended_data, s->nb_samples);

  513.             av_audio_fifo_read(s->fifo[1], (void **)cf[1]->extended_data, s->nb_samples);

  514. 

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

  516.                                  cf[1]->extended_data,

  517.                                  s->nb_samples, av_frame_get_channels(in),

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

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

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

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

  522.             ret = ff_filter_frame(outlink, out);

  523.             if (ret < 0)

  524.                 goto fail;

  525.         } else {

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

  527.             cf[1] = ff_get_audio_buffer(outlink, s->nb_samples);

  528.             if (!out || !cf[1]) {

  529.                 ret = AVERROR(ENOMEM);

  530.                 av_frame_free(&out);

  531.                 goto fail;

  532.             }

  533. 

  534.             av_audio_fifo_read(s->fifo[1], (void **)cf[1]->extended_data, s->nb_samples);

  535. 

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

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

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

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

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

  541.             ret = ff_filter_frame(outlink, out);

  542.             if (ret < 0)

  543.                 goto fail;

  544.         }

  545. 

  546.         nb_samples = av_audio_fifo_size(s->fifo[1]);

  547.         if (nb_samples > 0) {

  548.             out = ff_get_audio_buffer(outlink, nb_samples);

  549.             if (!out) {

  550.                 ret = AVERROR(ENOMEM);

  551.                 goto fail;

  552.             }

  553. 

  554.             av_audio_fifo_read(s->fifo[1], (void **)out->extended_data, nb_samples);

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

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

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

  558.             ret = ff_filter_frame(outlink, out);

  559.         }

  560.         s->crossfade_is_over = 1;

  561.     }

  562. 

  563. fail:

  564.     av_frame_free(&in);

  565.     av_frame_free(&cf[0]);

  566.     av_frame_free(&cf[1]);

  567.     return ret;

  568. }

  569. 

  570. static int acrossfade_request_frame(AVFilterLink *outlink)

  571. {

  572.     AVFilterContext *ctx = outlink->src;

  573.     AudioFadeContext *s = ctx->priv;

  574.     int ret = 0;

  575. 

  576.     if (!s->cf0_eof) {

  577.         AVFilterLink *cf0 = ctx->inputs[0];

  578.         ret = ff_request_frame(cf0);

  579.         if (ret < 0 && ret != AVERROR_EOF)

  580.             return ret;

  581.         if (ret == AVERROR_EOF) {

  582.             s->cf0_eof = 1;

  583.             ret = 0;

  584.         }

  585.     } else {

  586.         AVFilterLink *cf1 = ctx->inputs[1];

  587.         int nb_samples = av_audio_fifo_size(s->fifo[1]);

  588. 

  589.         ret = ff_request_frame(cf1);

  590.         if (ret == AVERROR_EOF && nb_samples > 0) {

  591.             AVFrame *out = ff_get_audio_buffer(outlink, nb_samples);

  592.             if (!out)

  593.                 return AVERROR(ENOMEM);

  594. 

  595.             av_audio_fifo_read(s->fifo[1], (void **)out->extended_data, nb_samples);

  596.             ret = ff_filter_frame(outlink, out);

  597.         }

  598.     }

  599. 

  600.     return ret;

  601. }

  602. 

  603. static int acrossfade_config_output(AVFilterLink *outlink)

  604. {

  605.     AVFilterContext *ctx = outlink->src;

  606.     AudioFadeContext *s  = ctx->priv;

  607. 

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

  609.         av_log(ctx, AV_LOG_ERROR,

  610.                "Inputs must have the same sample rate "

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

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

  613.         return AVERROR(EINVAL);

  614.     }

  615. 

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

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

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

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

  620. 

  621.     switch (outlink->format) {

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

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

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

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

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

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

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

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

  630.     }

  631. 

  632.     config_output(outlink);

  633. 

  634.     s->fifo[0] = av_audio_fifo_alloc(outlink->format, outlink->channels, s->nb_samples);

  635.     s->fifo[1] = av_audio_fifo_alloc(outlink->format, outlink->channels, s->nb_samples);

  636.     if (!s->fifo[0] || !s->fifo[1])

  637.         return AVERROR(ENOMEM);

  638. 

  639.     return 0;

  640. }

  641. 

  642. static av_cold void uninit(AVFilterContext *ctx)

  643. {

  644.     AudioFadeContext *s = ctx->priv;

  645. 

  646.     av_audio_fifo_free(s->fifo[0]);

  647.     av_audio_fifo_free(s->fifo[1]);

  648. }

  649. 

  650. static const AVFilterPad avfilter_af_acrossfade_inputs[] = {

  651.     {

  652.         .name         = "crossfade0",

  653.         .type         = AVMEDIA_TYPE_AUDIO,

  654.         .filter_frame = acrossfade_filter_frame,

  655.     },

  656.     {

  657.         .name         = "crossfade1",

  658.         .type         = AVMEDIA_TYPE_AUDIO,

  659.         .filter_frame = acrossfade_filter_frame,

  660.     },

  661.     { NULL }

  662. };

  663. 

  664. static const AVFilterPad avfilter_af_acrossfade_outputs[] = {

  665.     {

  666.         .name          = "default",

  667.         .type          = AVMEDIA_TYPE_AUDIO,

  668.         .request_frame = acrossfade_request_frame,

  669.         .config_props  = acrossfade_config_output,

  670.     },

  671.     { NULL }

  672. };

  673. 

  674. AVFilter ff_af_acrossfade = {

  675.     .name          = "acrossfade",

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

  677.     .query_formats = query_formats,

  678.     .priv_size     = sizeof(AudioFadeContext),

  679.     .uninit        = uninit,

  680.     .priv_class    = &acrossfade_class,

  681.     .inputs        = avfilter_af_acrossfade_inputs,

  682.     .outputs       = avfilter_af_acrossfade_outputs,

  683. };

  684. 

  685. #endif /* CONFIG_ACROSSFADE_FILTER */