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FFmpeg/libavfilter/af_afade.c

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  1. /*

  2.  * Copyright (c) 2013 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 "internal.h"

  30. 

  31. typedef struct {

  32.     const AVClass *class;

  33.     int type;

  34.     int curve;

  35.     int nb_samples;

  36.     int64_t start_sample;

  37.     int64_t duration;

  38.     int64_t start_time;

  39. 

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

  41.                          int nb_samples, int channels, int direction,

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

  43. } AudioFadeContext;

  44. 

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

  46. 

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

  48. #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

  49. 

  50. static const AVOption afade_options[] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  81.     { NULL }

  82. };

  83. 

  84. AVFILTER_DEFINE_CLASS(afade);

  85. 

  86. static av_cold int init(AVFilterContext *ctx)

  87. {

  88.     AudioFadeContext *s = ctx->priv;

  89. 

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

  91.         return AVERROR(EINVAL);

  92. 

  93.     return 0;

  94. }

  95. 

  96. static int query_formats(AVFilterContext *ctx)

  97. {

  98.     AVFilterFormats *formats;

  99.     AVFilterChannelLayouts *layouts;

  100.     static const enum AVSampleFormat sample_fmts[] = {

  101.         AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S16P,

  102.         AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_S32P,

  103.         AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_FLTP,

  104.         AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_DBLP,

  105.         AV_SAMPLE_FMT_NONE

  106.     };

  107.     int ret;

  108. 

  109.     layouts = ff_all_channel_layouts();

  110.     if (!layouts)

  111.         return AVERROR(ENOMEM);

  112.     ret = ff_set_common_channel_layouts(ctx, layouts);

  113.     if (ret < 0)

  114.         return ret;

  115. 

  116.     formats = ff_make_format_list(sample_fmts);

  117.     if (!formats)

  118.         return AVERROR(ENOMEM);

  119.     ret = ff_set_common_formats(ctx, formats);

  120.     if (ret < 0)

  121.         return ret;

  122. 

  123.     formats = ff_all_samplerates();

  124.     if (!formats)

  125.         return AVERROR(ENOMEM);

  126.     return ff_set_common_samplerates(ctx, formats);

  127. }

  128. 

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

  130. {

  131.     double gain;

  132. 

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

  134. 

  135.     switch (curve) {

  136.     case QSIN:

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

  138.         break;

  139.     case IQSIN:

  140.         gain = 0.636943 * asin(gain);

  141.         break;

  142.     case ESIN:

  143.         gain = 1.0 - cos(M_PI / 4.0 * (pow(2.0*gain - 1, 3) + 1));

  144.         break;

  145.     case HSIN:

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

  147.         break;

  148.     case IHSIN:

  149.         gain = 0.318471 * acos(1 - 2 * gain);

  150.         break;

  151.     case EXP:

  152.         gain = pow(0.1, (1 - gain) * 5.0);

  153.         break;

  154.     case LOG:

  155.         gain = av_clipd(0.0868589 * log(100000 * gain), 0, 1.0);

  156.         break;

  157.     case PAR:

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

  159.         break;

  160.     case IPAR:

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

  162.         break;

  163.     case QUA:

  164.         gain *= gain;

  165.         break;

  166.     case CUB:

  167.         gain = gain * gain * gain;

  168.         break;

  169.     case SQU:

  170.         gain = sqrt(gain);

  171.         break;

  172.     case CBR:

  173.         gain = cbrt(gain);

  174.         break;

  175.     case DESE:

  176.         gain = gain <= 0.5 ? pow(2 * gain, 1/3.) / 2: 1 - pow(2 * (1 - gain), 1/3.) / 2;

  177.         break;

  178.     case DESI:

  179.         gain = gain <= 0.5 ? pow(2 * gain, 3) / 2: 1 - pow(2 * (1 - gain), 3) / 2;

  180.         break;

  181.     }

  182. 

  183.     return gain;

  184. }

  185. 

  186. #define FADE_PLANAR(name, type)                                             \

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

  188.                                      int nb_samples, int channels, int dir, \

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

  190. {                                                                           \

  191.     int i, c;                                                               \

  192.                                                                             \

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

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

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

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

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

  198.                                                                             \

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

  200.         }                                                                   \

  201.     }                                                                       \

  202. }

  203. 

  204. #define FADE(name, type)                                                    \

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

  206.                                   int nb_samples, int channels, int dir,    \

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

  208. {                                                                           \

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

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

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

  212.                                                                             \

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

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

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

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

  217.     }                                                                       \

  218. }

  219. 

  220. FADE_PLANAR(dbl, double)

  221. FADE_PLANAR(flt, float)

  222. FADE_PLANAR(s16, int16_t)

  223. FADE_PLANAR(s32, int32_t)

  224. 

  225. FADE(dbl, double)

  226. FADE(flt, float)

  227. FADE(s16, int16_t)

  228. FADE(s32, int32_t)

  229. 

  230. static int config_input(AVFilterLink *inlink)

  231. {

  232.     AVFilterContext *ctx = inlink->dst;

  233.     AudioFadeContext *s  = ctx->priv;

  234. 

  235.     switch (inlink->format) {

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

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

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

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

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

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

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

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

  244.     }

  245. 

  246.     if (s->duration)

  247.         s->nb_samples = av_rescale(s->duration, inlink->sample_rate, AV_TIME_BASE);

  248.     if (s->start_time)

  249.         s->start_sample = av_rescale(s->start_time, inlink->sample_rate, AV_TIME_BASE);

  250. 

  251.     return 0;

  252. }

  253. 

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

  255. {

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

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

  258.     int nb_samples          = buf->nb_samples;

  259.     AVFrame *out_buf;

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

  261. 

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

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

  264.         return ff_filter_frame(outlink, buf);

  265. 

  266.     if (av_frame_is_writable(buf)) {

  267.         out_buf = buf;

  268.     } else {

  269.         out_buf = ff_get_audio_buffer(inlink, nb_samples);

  270.         if (!out_buf)

  271.             return AVERROR(ENOMEM);

  272.         av_frame_copy_props(out_buf, buf);

  273.     }

  274. 

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

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

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

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

  279.     } else {

  280.         int64_t start;

  281. 

  282.         if (!s->type)

  283.             start = cur_sample - s->start_sample;

  284.         else

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

  286. 

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

  288.                         nb_samples, av_frame_get_channels(buf),

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

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

  291.     }

  292. 

  293.     if (buf != out_buf)

  294.         av_frame_free(&buf);

  295. 

  296.     return ff_filter_frame(outlink, out_buf);

  297. }

  298. 

  299. static const AVFilterPad avfilter_af_afade_inputs[] = {

  300.     {

  301.         .name         = "default",

  302.         .type         = AVMEDIA_TYPE_AUDIO,

  303.         .filter_frame = filter_frame,

  304.         .config_props = config_input,

  305.     },

  306.     { NULL }

  307. };

  308. 

  309. static const AVFilterPad avfilter_af_afade_outputs[] = {

  310.     {

  311.         .name = "default",

  312.         .type = AVMEDIA_TYPE_AUDIO,

  313.     },

  314.     { NULL }

  315. };

  316. 

  317. AVFilter ff_af_afade = {

  318.     .name          = "afade",

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

  320.     .query_formats = query_formats,

  321.     .priv_size     = sizeof(AudioFadeContext),

  322.     .init          = init,

  323.     .inputs        = avfilter_af_afade_inputs,

  324.     .outputs       = avfilter_af_afade_outputs,

  325.     .priv_class    = &afade_class,

  326.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,

  327. };