2 * Copyright (c) 2013-2015 Paul B Mahol
4 * This file is part of FFmpeg.
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.
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.
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
26 #include "libavutil/audio_fifo.h"
27 #include "libavutil/opt.h"
42 int crossfade_is_over;
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,
51 int nb_samples, int channels,
52 int curve0, int curve1);
55 enum CurveType { TRI, QSIN, ESIN, HSIN, LOG, IPAR, QUA, CUB, SQU, CBR, PAR, EXP, IQSIN, IHSIN, DESE, DESI, NB_CURVES };
57 #define OFFSET(x) offsetof(AudioFadeContext, x)
58 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
60 static int query_formats(AVFilterContext *ctx)
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,
73 layouts = ff_all_channel_counts();
75 return AVERROR(ENOMEM);
76 ret = ff_set_common_channel_layouts(ctx, layouts);
80 formats = ff_make_format_list(sample_fmts);
82 return AVERROR(ENOMEM);
83 ret = ff_set_common_formats(ctx, formats);
87 formats = ff_all_samplerates();
89 return AVERROR(ENOMEM);
90 return ff_set_common_samplerates(ctx, formats);
93 static double fade_gain(int curve, int64_t index, int range)
95 #define CUBE(a) ((a)*(a)*(a))
98 gain = av_clipd(1.0 * index / range, 0, 1.0);
102 gain = sin(gain * M_PI / 2.0);
105 /* 0.6... = 2 / M_PI */
106 gain = 0.6366197723675814 * asin(gain);
109 gain = 1.0 - cos(M_PI / 4.0 * (CUBE(2.0*gain - 1) + 1));
112 gain = (1.0 - cos(gain * M_PI)) / 2.0;
115 /* 0.3... = 1 / M_PI */
116 gain = 0.3183098861837907 * acos(1 - 2 * gain);
119 /* -11.5... = 5*ln(0.1) */
120 gain = exp(-11.512925464970227 * (1 - gain));
123 gain = av_clipd(1 + 0.2 * log10(gain), 0, 1.0);
126 gain = 1 - sqrt(1 - gain);
129 gain = (1 - (1 - gain) * (1 - gain));
144 gain = gain <= 0.5 ? cbrt(2 * gain) / 2: 1 - cbrt(2 * (1 - gain)) / 2;
147 gain = gain <= 0.5 ? CUBE(2 * gain) / 2: 1 - CUBE(2 * (1 - gain)) / 2;
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) \
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]; \
167 d[i] = s[i] * gain; \
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) \
177 type *d = (type *)dst[0]; \
178 const type *s = (type *)src[0]; \
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; \
188 FADE_PLANAR(dbl, double)
189 FADE_PLANAR(flt, float)
190 FADE_PLANAR(s16, int16_t)
191 FADE_PLANAR(s32, int32_t)
198 static int config_output(AVFilterLink *outlink)
200 AVFilterContext *ctx = outlink->src;
201 AudioFadeContext *s = ctx->priv;
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;
215 s->nb_samples = av_rescale(s->duration, outlink->sample_rate, AV_TIME_BASE);
217 s->start_sample = av_rescale(s->start_time, outlink->sample_rate, AV_TIME_BASE);
222 #if CONFIG_AFADE_FILTER
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" },
258 AVFILTER_DEFINE_CLASS(afade);
260 static av_cold int init(AVFilterContext *ctx)
262 AudioFadeContext *s = ctx->priv;
264 if (INT64_MAX - s->nb_samples < s->start_sample)
265 return AVERROR(EINVAL);
270 static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
272 AudioFadeContext *s = inlink->dst->priv;
273 AVFilterLink *outlink = inlink->dst->outputs[0];
274 int nb_samples = buf->nb_samples;
276 int64_t cur_sample = av_rescale_q(buf->pts, inlink->time_base, (AVRational){1, inlink->sample_rate});
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);
282 if (av_frame_is_writable(buf)) {
285 out_buf = ff_get_audio_buffer(inlink, nb_samples);
287 return AVERROR(ENOMEM);
288 av_frame_copy_props(out_buf, buf);
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);
299 start = cur_sample - s->start_sample;
301 start = s->start_sample + s->nb_samples - cur_sample;
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);
312 return ff_filter_frame(outlink, out_buf);
315 static const AVFilterPad avfilter_af_afade_inputs[] = {
318 .type = AVMEDIA_TYPE_AUDIO,
319 .filter_frame = filter_frame,
324 static const AVFilterPad avfilter_af_afade_outputs[] = {
327 .type = AVMEDIA_TYPE_AUDIO,
328 .config_props = config_output,
333 AVFilter ff_af_afade = {
335 .description = NULL_IF_CONFIG_SMALL("Fade in/out input audio."),
336 .query_formats = query_formats,
337 .priv_size = sizeof(AudioFadeContext),
339 .inputs = avfilter_af_afade_inputs,
340 .outputs = avfilter_af_afade_outputs,
341 .priv_class = &afade_class,
342 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
345 #endif /* CONFIG_AFADE_FILTER */
347 #if CONFIG_ACROSSFADE_FILTER
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" },
395 AVFILTER_DEFINE_CLASS(acrossfade);
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) \
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]; \
413 d[i] = s0[i] * gain0 + s1[i] * gain1; \
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) \
424 type *d = (type *)dst[0]; \
425 const type *s0 = (type *)cf0[0]; \
426 const type *s1 = (type *)cf1[0]; \
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; \
437 CROSSFADE_PLANAR(dbl, double)
438 CROSSFADE_PLANAR(flt, float)
439 CROSSFADE_PLANAR(s16, int16_t)
440 CROSSFADE_PLANAR(s32, int32_t)
442 CROSSFADE(dbl, double)
443 CROSSFADE(flt, float)
444 CROSSFADE(s16, int16_t)
445 CROSSFADE(s32, int32_t)
447 static int acrossfade_filter_frame(AVFilterLink *inlink, AVFrame *in)
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;
455 if (s->crossfade_is_over) {
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);
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);
467 ret = AVERROR(ENOMEM);
470 av_audio_fifo_read(s->fifo[0], (void **)out->extended_data, nb_samples);
472 s->pts += av_rescale_q(nb_samples,
473 (AVRational){ 1, outlink->sample_rate }, outlink->time_base);
474 ret = ff_filter_frame(outlink, out);
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]);
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);
486 av_audio_fifo_read(s->fifo[0], (void **)cf[0]->extended_data, nb_samples);
488 s->fade_samples(out->extended_data, cf[0]->extended_data, nb_samples,
489 outlink->channels, -1, nb_samples - 1, nb_samples, s->curve);
491 s->pts += av_rescale_q(nb_samples,
492 (AVRational){ 1, outlink->sample_rate }, outlink->time_base);
493 ret = ff_filter_frame(outlink, out);
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);
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]) {
508 ret = AVERROR(ENOMEM);
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);
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);
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);
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);
534 av_audio_fifo_read(s->fifo[1], (void **)cf[1]->extended_data, s->nb_samples);
536 s->fade_samples(out->extended_data, cf[1]->extended_data, s->nb_samples,
537 outlink->channels, 1, 0, s->nb_samples, s->curve2);
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);
546 nb_samples = av_audio_fifo_size(s->fifo[1]);
547 if (nb_samples > 0) {
548 out = ff_get_audio_buffer(outlink, nb_samples);
550 ret = AVERROR(ENOMEM);
554 av_audio_fifo_read(s->fifo[1], (void **)out->extended_data, nb_samples);
556 s->pts += av_rescale_q(nb_samples,
557 (AVRational){ 1, outlink->sample_rate }, outlink->time_base);
558 ret = ff_filter_frame(outlink, out);
560 s->crossfade_is_over = 1;
565 av_frame_free(&cf[0]);
566 av_frame_free(&cf[1]);
570 static int acrossfade_request_frame(AVFilterLink *outlink)
572 AVFilterContext *ctx = outlink->src;
573 AudioFadeContext *s = ctx->priv;
577 AVFilterLink *cf0 = ctx->inputs[0];
578 ret = ff_request_frame(cf0);
579 if (ret < 0 && ret != AVERROR_EOF)
581 if (ret == AVERROR_EOF) {
586 AVFilterLink *cf1 = ctx->inputs[1];
587 int nb_samples = av_audio_fifo_size(s->fifo[1]);
589 ret = ff_request_frame(cf1);
590 if (ret == AVERROR_EOF && nb_samples > 0) {
591 AVFrame *out = ff_get_audio_buffer(outlink, nb_samples);
593 return AVERROR(ENOMEM);
595 av_audio_fifo_read(s->fifo[1], (void **)out->extended_data, nb_samples);
596 ret = ff_filter_frame(outlink, out);
603 static int acrossfade_config_output(AVFilterLink *outlink)
605 AVFilterContext *ctx = outlink->src;
606 AudioFadeContext *s = ctx->priv;
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);
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;
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;
632 config_output(outlink);
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);
642 static av_cold void uninit(AVFilterContext *ctx)
644 AudioFadeContext *s = ctx->priv;
646 av_audio_fifo_free(s->fifo[0]);
647 av_audio_fifo_free(s->fifo[1]);
650 static const AVFilterPad avfilter_af_acrossfade_inputs[] = {
652 .name = "crossfade0",
653 .type = AVMEDIA_TYPE_AUDIO,
654 .filter_frame = acrossfade_filter_frame,
657 .name = "crossfade1",
658 .type = AVMEDIA_TYPE_AUDIO,
659 .filter_frame = acrossfade_filter_frame,
664 static const AVFilterPad avfilter_af_acrossfade_outputs[] = {
667 .type = AVMEDIA_TYPE_AUDIO,
668 .request_frame = acrossfade_request_frame,
669 .config_props = acrossfade_config_output,
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),
680 .priv_class = &acrossfade_class,
681 .inputs = avfilter_af_acrossfade_inputs,
682 .outputs = avfilter_af_acrossfade_outputs,
685 #endif /* CONFIG_ACROSSFADE_FILTER */