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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. #define FF_INTERNAL_FIELDS 1

  27. #include "framequeue.h"

  28. 

  29. #include "libavutil/audio_fifo.h"

  30. #include "libavutil/opt.h"

  31. #include "audio.h"

  32. #include "avfilter.h"

  33. #include "filters.h"

  34. #include "internal.h"

  35. 

  36. typedef struct AudioFadeContext {

  37.     const AVClass *class;

  38.     int type;

  39.     int curve, curve2;

  40.     int64_t nb_samples;

  41.     int64_t start_sample;

  42.     int64_t duration;

  43.     int64_t start_time;

  44.     int overlap;

  45.     int cf0_eof;

  46.     int prev_size;

  47.     int crossfade_is_over;

  48.     AVAudioFifo *fifo[2];

  49.     int64_t pts;

  50. 

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

  52.                          int nb_samples, int channels, int direction,

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

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

  55.                               uint8_t * const *cf1,

  56.                               int nb_samples, int channels,

  57.                               int curve0, int curve1);

  58. } AudioFadeContext;

  59. 

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

  61. 

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

  63. #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

  64. 

  65. static int query_formats(AVFilterContext *ctx)

  66. {

  67.     AVFilterFormats *formats;

  68.     AVFilterChannelLayouts *layouts;

  69.     static const enum AVSampleFormat sample_fmts[] = {

  70.         AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S16P,

  71.         AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_S32P,

  72.         AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_FLTP,

  73.         AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_DBLP,

  74.         AV_SAMPLE_FMT_NONE

  75.     };

  76.     int ret;

  77. 

  78.     layouts = ff_all_channel_counts();

  79.     if (!layouts)

  80.         return AVERROR(ENOMEM);

  81.     ret = ff_set_common_channel_layouts(ctx, layouts);

  82.     if (ret < 0)

  83.         return ret;

  84. 

  85.     formats = ff_make_format_list(sample_fmts);

  86.     if (!formats)

  87.         return AVERROR(ENOMEM);

  88.     ret = ff_set_common_formats(ctx, formats);

  89.     if (ret < 0)

  90.         return ret;

  91. 

  92.     formats = ff_all_samplerates();

  93.     if (!formats)

  94.         return AVERROR(ENOMEM);

  95.     return ff_set_common_samplerates(ctx, formats);

  96. }

  97. 

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

  99. {

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

  101.     double gain;

  102. 

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

  104. 

  105.     switch (curve) {

  106.     case QSIN:

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

  108.         break;

  109.     case IQSIN:

  110.         /* 0.6... = 2 / M_PI */

  111.         gain = 0.6366197723675814 * asin(gain);

  112.         break;

  113.     case ESIN:

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

  115.         break;

  116.     case HSIN:

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

  118.         break;

  119.     case IHSIN:

  120.         /* 0.3... = 1 / M_PI */

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

  122.         break;

  123.     case EXP:

  124.         /* -11.5... = 5*ln(0.1) */

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

  126.         break;

  127.     case LOG:

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

  129.         break;

  130.     case PAR:

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

  132.         break;

  133.     case IPAR:

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

  135.         break;

  136.     case QUA:

  137.         gain *= gain;

  138.         break;

  139.     case CUB:

  140.         gain = CUBE(gain);

  141.         break;

  142.     case SQU:

  143.         gain = sqrt(gain);

  144.         break;

  145.     case CBR:

  146.         gain = cbrt(gain);

  147.         break;

  148.     case DESE:

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

  150.         break;

  151.     case DESI:

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

  153.         break;

  154.     }

  155. 

  156.     return gain;

  157. }

  158. 

  159. #define FADE_PLANAR(name, type)                                             \

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

  161.                                      int nb_samples, int channels, int dir, \

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

  163. {                                                                           \

  164.     int i, c;                                                               \

  165.                                                                             \

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

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

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

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

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

  171.                                                                             \

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

  173.         }                                                                   \

  174.     }                                                                       \

  175. }

  176. 

  177. #define FADE(name, type)                                                    \

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

  179.                                   int nb_samples, int channels, int dir,    \

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

  181. {                                                                           \

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

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

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

  185.                                                                             \

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

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

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

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

  190.     }                                                                       \

  191. }

  192. 

  193. FADE_PLANAR(dbl, double)

  194. FADE_PLANAR(flt, float)

  195. FADE_PLANAR(s16, int16_t)

  196. FADE_PLANAR(s32, int32_t)

  197. 

  198. FADE(dbl, double)

  199. FADE(flt, float)

  200. FADE(s16, int16_t)

  201. FADE(s32, int32_t)

  202. 

  203. static int config_output(AVFilterLink *outlink)

  204. {

  205.     AVFilterContext *ctx = outlink->src;

  206.     AudioFadeContext *s  = ctx->priv;

  207. 

  208.     switch (outlink->format) {

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

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

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

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

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

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

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

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

  217.     }

  218. 

  219.     if (s->duration)

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

  221.     if (s->start_time)

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

  223. 

  224.     return 0;

  225. }

  226. 

  227. #if CONFIG_AFADE_FILTER

  228. 

  229. static const AVOption afade_options[] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  260.     { NULL }

  261. };

  262. 

  263. AVFILTER_DEFINE_CLASS(afade);

  264. 

  265. static av_cold int init(AVFilterContext *ctx)

  266. {

  267.     AudioFadeContext *s = ctx->priv;

  268. 

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

  270.         return AVERROR(EINVAL);

  271. 

  272.     return 0;

  273. }

  274. 

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

  276. {

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

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

  279.     int nb_samples          = buf->nb_samples;

  280.     AVFrame *out_buf;

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

  282. 

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

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

  285.         return ff_filter_frame(outlink, buf);

  286. 

  287.     if (av_frame_is_writable(buf)) {

  288.         out_buf = buf;

  289.     } else {

  290.         out_buf = ff_get_audio_buffer(outlink, nb_samples);

  291.         if (!out_buf)

  292.             return AVERROR(ENOMEM);

  293.         av_frame_copy_props(out_buf, buf);

  294.     }

  295. 

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

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

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

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

  300.     } else {

  301.         int64_t start;

  302. 

  303.         if (!s->type)

  304.             start = cur_sample - s->start_sample;

  305.         else

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

  307. 

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

  309.                         nb_samples, buf->channels,

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

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

  312.     }

  313. 

  314.     if (buf != out_buf)

  315.         av_frame_free(&buf);

  316. 

  317.     return ff_filter_frame(outlink, out_buf);

  318. }

  319. 

  320. static const AVFilterPad avfilter_af_afade_inputs[] = {

  321.     {

  322.         .name         = "default",

  323.         .type         = AVMEDIA_TYPE_AUDIO,

  324.         .filter_frame = filter_frame,

  325.     },

  326.     { NULL }

  327. };

  328. 

  329. static const AVFilterPad avfilter_af_afade_outputs[] = {

  330.     {

  331.         .name         = "default",

  332.         .type         = AVMEDIA_TYPE_AUDIO,

  333.         .config_props = config_output,

  334.     },

  335.     { NULL }

  336. };

  337. 

  338. AVFilter ff_af_afade = {

  339.     .name          = "afade",

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

  341.     .query_formats = query_formats,

  342.     .priv_size     = sizeof(AudioFadeContext),

  343.     .init          = init,

  344.     .inputs        = avfilter_af_afade_inputs,

  345.     .outputs       = avfilter_af_afade_outputs,

  346.     .priv_class    = &afade_class,

  347.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,

  348. };

  349. 

  350. #endif /* CONFIG_AFADE_FILTER */

  351. 

  352. #if CONFIG_ACROSSFADE_FILTER

  353. 

  354. static const AVOption acrossfade_options[] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  381.     { NULL }

  382. };

  383. 

  384. AVFILTER_DEFINE_CLASS(acrossfade);

  385. 

  386. #define CROSSFADE_PLANAR(name, type)                                           \

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

  388.                                           uint8_t * const *cf1,                \

  389.                                           int nb_samples, int channels,        \

  390.                                           int curve0, int curve1)              \

  391. {                                                                              \

  392.     int i, c;                                                                  \

  393.                                                                                \

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

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

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

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

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

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

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

  401.                                                                                \

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

  403.         }                                                                      \

  404.     }                                                                          \

  405. }

  406. 

  407. #define CROSSFADE(name, type)                                               \

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

  409.                                        uint8_t * const *cf1,                \

  410.                                        int nb_samples, int channels,        \

  411.                                        int curve0, int curve1)              \

  412. {                                                                           \

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

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

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

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

  417.                                                                             \

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

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

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

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

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

  423.     }                                                                       \

  424. }

  425. 

  426. CROSSFADE_PLANAR(dbl, double)

  427. CROSSFADE_PLANAR(flt, float)

  428. CROSSFADE_PLANAR(s16, int16_t)

  429. CROSSFADE_PLANAR(s32, int32_t)

  430. 

  431. CROSSFADE(dbl, double)

  432. CROSSFADE(flt, float)

  433. CROSSFADE(s16, int16_t)

  434. CROSSFADE(s32, int32_t)

  435. 

  436. static int activate(AVFilterContext *ctx)

  437. {

  438.     AudioFadeContext *s   = ctx->priv;

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

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

  441.     int ret = 0, nb_samples, status;

  442.     int64_t pts;

  443. 

  444.     FF_FILTER_FORWARD_STATUS_BACK_ALL(outlink, ctx);

  445. 

  446.     if (s->crossfade_is_over) {

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

  448.         if (ret < 0) {

  449.             return ret;

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

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

  452.             return 0;

  453.         } else {

  454.             if (ff_outlink_frame_wanted(ctx->outputs[0]) && !in) {

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

  456.                 return 0;

  457.             }

  458.         }

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

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

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

  462.         return ff_filter_frame(outlink, in);

  463.     }

  464. 

  465.     if (ff_framequeue_queued_samples(&ctx->inputs[0]->fifo) > s->nb_samples) {

  466.         nb_samples = ff_framequeue_queued_samples(&ctx->inputs[0]->fifo) - s->nb_samples;

  467.         if (nb_samples > 0) {

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

  469.             if (ret < 0) {

  470.                 return ret;

  471.             }

  472.         }

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

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

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

  476.         return ff_filter_frame(outlink, in);

  477.     } else if (ff_framequeue_queued_samples(&ctx->inputs[1]->fifo) >= s->nb_samples) {

  478.         if (s->overlap) {

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

  480.             if (!out)

  481.                 return AVERROR(ENOMEM);

  482. 

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

  484.             if (ret < 0) {

  485.                 av_frame_free(&out);

  486.                 return ret;

  487.             }

  488. 

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

  490.             if (ret < 0) {

  491.                 av_frame_free(&out);

  492.                 return ret;

  493.             }

  494. 

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

  496.                                  cf[1]->extended_data,

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

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

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

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

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

  502.             s->crossfade_is_over = 1;

  503.             av_frame_free(&cf[0]);

  504.             av_frame_free(&cf[1]);

  505.             return ff_filter_frame(outlink, out);

  506.         } else {

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

  508.             if (!out)

  509.                 return AVERROR(ENOMEM);

  510. 

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

  512.             if (ret < 0) {

  513.                 av_frame_free(&out);

  514.                 return ret;

  515.             }

  516. 

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

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

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

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

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

  522.             av_frame_free(&cf[0]);

  523.             ret = ff_filter_frame(outlink, out);

  524.             if (ret < 0)

  525.                 return ret;

  526. 

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

  528.             if (!out)

  529.                 return AVERROR(ENOMEM);

  530. 

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

  532.             if (ret < 0) {

  533.                 av_frame_free(&out);

  534.                 return ret;

  535.             }

  536. 

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

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

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

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

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

  542.             s->crossfade_is_over = 1;

  543.             av_frame_free(&cf[1]);

  544.             return ff_filter_frame(outlink, out);

  545.         }

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

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

  548.             s->cf0_eof = 1;

  549.         }

  550.         if (ctx->inputs[1]->status_in) {

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

  552.             return 0;

  553.         }

  554.         if (!s->cf0_eof)

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

  556.         else

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

  558.         return 0;

  559.     }

  560. 

  561.     return ret;

  562. }

  563. 

  564. static int acrossfade_config_output(AVFilterLink *outlink)

  565. {

  566.     AVFilterContext *ctx = outlink->src;

  567.     AudioFadeContext *s  = ctx->priv;

  568. 

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

  570.         av_log(ctx, AV_LOG_ERROR,

  571.                "Inputs must have the same sample rate "

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

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

  574.         return AVERROR(EINVAL);

  575.     }

  576. 

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

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

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

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

  581. 

  582.     switch (outlink->format) {

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

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

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

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

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

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

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

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

  591.     }

  592. 

  593.     config_output(outlink);

  594. 

  595.     return 0;

  596. }

  597. 

  598. static const AVFilterPad avfilter_af_acrossfade_inputs[] = {

  599.     {

  600.         .name         = "crossfade0",

  601.         .type         = AVMEDIA_TYPE_AUDIO,

  602.     },

  603.     {

  604.         .name         = "crossfade1",

  605.         .type         = AVMEDIA_TYPE_AUDIO,

  606.     },

  607.     { NULL }

  608. };

  609. 

  610. static const AVFilterPad avfilter_af_acrossfade_outputs[] = {

  611.     {

  612.         .name          = "default",

  613.         .type          = AVMEDIA_TYPE_AUDIO,

  614.         .config_props  = acrossfade_config_output,

  615.     },

  616.     { NULL }

  617. };

  618. 

  619. AVFilter ff_af_acrossfade = {

  620.     .name          = "acrossfade",

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

  622.     .query_formats = query_formats,

  623.     .priv_size     = sizeof(AudioFadeContext),

  624.     .activate      = activate,

  625.     .priv_class    = &acrossfade_class,

  626.     .inputs        = avfilter_af_acrossfade_inputs,

  627.     .outputs       = avfilter_af_acrossfade_outputs,

  628. };

  629. 

  630. #endif /* CONFIG_ACROSSFADE_FILTER */