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_layouts();
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)
97 gain = av_clipd(1.0 * index / range, 0, 1.0);
101 gain = sin(gain * M_PI / 2.0);
104 gain = 0.636943 * asin(gain);
107 gain = 1.0 - cos(M_PI / 4.0 * (pow(2.0*gain - 1, 3) + 1));
110 gain = (1.0 - cos(gain * M_PI)) / 2.0;
113 gain = 0.318471 * acos(1 - 2 * gain);
116 gain = pow(0.1, (1 - gain) * 5.0);
119 gain = av_clipd(0.0868589 * log(100000 * gain), 0, 1.0);
122 gain = 1 - sqrt(1 - gain);
125 gain = (1 - (1 - gain) * (1 - gain));
131 gain = gain * gain * gain;
140 gain = gain <= 0.5 ? pow(2 * gain, 1/3.) / 2: 1 - pow(2 * (1 - gain), 1/3.) / 2;
143 gain = gain <= 0.5 ? pow(2 * gain, 3) / 2: 1 - pow(2 * (1 - gain), 3) / 2;
150 #define FADE_PLANAR(name, type) \
151 static void fade_samples_## name ##p(uint8_t **dst, uint8_t * const *src, \
152 int nb_samples, int channels, int dir, \
153 int64_t start, int range, int curve) \
157 for (i = 0; i < nb_samples; i++) { \
158 double gain = fade_gain(curve, start + i * dir, range); \
159 for (c = 0; c < channels; c++) { \
160 type *d = (type *)dst[c]; \
161 const type *s = (type *)src[c]; \
163 d[i] = s[i] * gain; \
168 #define FADE(name, type) \
169 static void fade_samples_## name (uint8_t **dst, uint8_t * const *src, \
170 int nb_samples, int channels, int dir, \
171 int64_t start, int range, int curve) \
173 type *d = (type *)dst[0]; \
174 const type *s = (type *)src[0]; \
177 for (i = 0; i < nb_samples; i++) { \
178 double gain = fade_gain(curve, start + i * dir, range); \
179 for (c = 0; c < channels; c++, k++) \
180 d[k] = s[k] * gain; \
184 FADE_PLANAR(dbl, double)
185 FADE_PLANAR(flt, float)
186 FADE_PLANAR(s16, int16_t)
187 FADE_PLANAR(s32, int32_t)
194 static int config_output(AVFilterLink *outlink)
196 AVFilterContext *ctx = outlink->src;
197 AudioFadeContext *s = ctx->priv;
199 switch (outlink->format) {
200 case AV_SAMPLE_FMT_DBL: s->fade_samples = fade_samples_dbl; break;
201 case AV_SAMPLE_FMT_DBLP: s->fade_samples = fade_samples_dblp; break;
202 case AV_SAMPLE_FMT_FLT: s->fade_samples = fade_samples_flt; break;
203 case AV_SAMPLE_FMT_FLTP: s->fade_samples = fade_samples_fltp; break;
204 case AV_SAMPLE_FMT_S16: s->fade_samples = fade_samples_s16; break;
205 case AV_SAMPLE_FMT_S16P: s->fade_samples = fade_samples_s16p; break;
206 case AV_SAMPLE_FMT_S32: s->fade_samples = fade_samples_s32; break;
207 case AV_SAMPLE_FMT_S32P: s->fade_samples = fade_samples_s32p; break;
211 s->nb_samples = av_rescale(s->duration, outlink->sample_rate, AV_TIME_BASE);
213 s->start_sample = av_rescale(s->start_time, outlink->sample_rate, AV_TIME_BASE);
218 #if CONFIG_AFADE_FILTER
220 static const AVOption afade_options[] = {
221 { "type", "set the fade direction", OFFSET(type), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, FLAGS, "type" },
222 { "t", "set the fade direction", OFFSET(type), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, FLAGS, "type" },
223 { "in", "fade-in", 0, AV_OPT_TYPE_CONST, {.i64 = 0 }, 0, 0, FLAGS, "type" },
224 { "out", "fade-out", 0, AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 0, FLAGS, "type" },
225 { "start_sample", "set number of first sample to start fading", OFFSET(start_sample), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, INT64_MAX, FLAGS },
226 { "ss", "set number of first sample to start fading", OFFSET(start_sample), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, INT64_MAX, FLAGS },
227 { "nb_samples", "set number of samples for fade duration", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 44100}, 1, INT32_MAX, FLAGS },
228 { "ns", "set number of samples for fade duration", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 44100}, 1, INT32_MAX, FLAGS },
229 { "start_time", "set time to start fading", OFFSET(start_time), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },
230 { "st", "set time to start fading", OFFSET(start_time), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },
231 { "duration", "set fade duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },
232 { "d", "set fade duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },
233 { "curve", "set fade curve type", OFFSET(curve), AV_OPT_TYPE_INT, {.i64 = TRI }, 0, NB_CURVES - 1, FLAGS, "curve" },
234 { "c", "set fade curve type", OFFSET(curve), AV_OPT_TYPE_INT, {.i64 = TRI }, 0, NB_CURVES - 1, FLAGS, "curve" },
235 { "tri", "linear slope", 0, AV_OPT_TYPE_CONST, {.i64 = TRI }, 0, 0, FLAGS, "curve" },
236 { "qsin", "quarter of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = QSIN }, 0, 0, FLAGS, "curve" },
237 { "esin", "exponential sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = ESIN }, 0, 0, FLAGS, "curve" },
238 { "hsin", "half of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = HSIN }, 0, 0, FLAGS, "curve" },
239 { "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64 = LOG }, 0, 0, FLAGS, "curve" },
240 { "ipar", "inverted parabola", 0, AV_OPT_TYPE_CONST, {.i64 = IPAR }, 0, 0, FLAGS, "curve" },
241 { "qua", "quadratic", 0, AV_OPT_TYPE_CONST, {.i64 = QUA }, 0, 0, FLAGS, "curve" },
242 { "cub", "cubic", 0, AV_OPT_TYPE_CONST, {.i64 = CUB }, 0, 0, FLAGS, "curve" },
243 { "squ", "square root", 0, AV_OPT_TYPE_CONST, {.i64 = SQU }, 0, 0, FLAGS, "curve" },
244 { "cbr", "cubic root", 0, AV_OPT_TYPE_CONST, {.i64 = CBR }, 0, 0, FLAGS, "curve" },
245 { "par", "parabola", 0, AV_OPT_TYPE_CONST, {.i64 = PAR }, 0, 0, FLAGS, "curve" },
246 { "exp", "exponential", 0, AV_OPT_TYPE_CONST, {.i64 = EXP }, 0, 0, FLAGS, "curve" },
247 { "iqsin", "inverted quarter of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = IQSIN}, 0, 0, FLAGS, "curve" },
248 { "ihsin", "inverted half of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = IHSIN}, 0, 0, FLAGS, "curve" },
249 { "dese", "double-exponential seat", 0, AV_OPT_TYPE_CONST, {.i64 = DESE }, 0, 0, FLAGS, "curve" },
250 { "desi", "double-exponential sigmoid", 0, AV_OPT_TYPE_CONST, {.i64 = DESI }, 0, 0, FLAGS, "curve" },
254 AVFILTER_DEFINE_CLASS(afade);
256 static av_cold int init(AVFilterContext *ctx)
258 AudioFadeContext *s = ctx->priv;
260 if (INT64_MAX - s->nb_samples < s->start_sample)
261 return AVERROR(EINVAL);
266 static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
268 AudioFadeContext *s = inlink->dst->priv;
269 AVFilterLink *outlink = inlink->dst->outputs[0];
270 int nb_samples = buf->nb_samples;
272 int64_t cur_sample = av_rescale_q(buf->pts, inlink->time_base, (AVRational){1, inlink->sample_rate});
274 if ((!s->type && (s->start_sample + s->nb_samples < cur_sample)) ||
275 ( s->type && (cur_sample + s->nb_samples < s->start_sample)))
276 return ff_filter_frame(outlink, buf);
278 if (av_frame_is_writable(buf)) {
281 out_buf = ff_get_audio_buffer(inlink, nb_samples);
283 return AVERROR(ENOMEM);
284 av_frame_copy_props(out_buf, buf);
287 if ((!s->type && (cur_sample + nb_samples < s->start_sample)) ||
288 ( s->type && (s->start_sample + s->nb_samples < cur_sample))) {
289 av_samples_set_silence(out_buf->extended_data, 0, nb_samples,
290 av_frame_get_channels(out_buf), out_buf->format);
295 start = cur_sample - s->start_sample;
297 start = s->start_sample + s->nb_samples - cur_sample;
299 s->fade_samples(out_buf->extended_data, buf->extended_data,
300 nb_samples, av_frame_get_channels(buf),
301 s->type ? -1 : 1, start,
302 s->nb_samples, s->curve);
308 return ff_filter_frame(outlink, out_buf);
311 static const AVFilterPad avfilter_af_afade_inputs[] = {
314 .type = AVMEDIA_TYPE_AUDIO,
315 .filter_frame = filter_frame,
320 static const AVFilterPad avfilter_af_afade_outputs[] = {
323 .type = AVMEDIA_TYPE_AUDIO,
324 .config_props = config_output,
329 AVFilter ff_af_afade = {
331 .description = NULL_IF_CONFIG_SMALL("Fade in/out input audio."),
332 .query_formats = query_formats,
333 .priv_size = sizeof(AudioFadeContext),
335 .inputs = avfilter_af_afade_inputs,
336 .outputs = avfilter_af_afade_outputs,
337 .priv_class = &afade_class,
338 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
341 #endif /* CONFIG_AFADE_FILTER */
343 #if CONFIG_ACROSSFADE_FILTER
345 static const AVOption acrossfade_options[] = {
346 { "nb_samples", "set number of samples for cross fade duration", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 44100}, 1, INT32_MAX/10, FLAGS },
347 { "ns", "set number of samples for cross fade duration", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 44100}, 1, INT32_MAX/10, FLAGS },
348 { "duration", "set cross fade duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, 60, FLAGS },
349 { "d", "set cross fade duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, 60, FLAGS },
350 { "overlap", "overlap 1st stream end with 2nd stream start", OFFSET(overlap), AV_OPT_TYPE_INT, {.i64 = 1 }, 0, 1, FLAGS },
351 { "o", "overlap 1st stream end with 2nd stream start", OFFSET(overlap), AV_OPT_TYPE_INT, {.i64 = 1 }, 0, 1, FLAGS },
352 { "curve1", "set fade curve type for 1st stream", OFFSET(curve), AV_OPT_TYPE_INT, {.i64 = TRI }, 0, NB_CURVES - 1, FLAGS, "curve1" },
353 { "c1", "set fade curve type for 1st stream", OFFSET(curve), AV_OPT_TYPE_INT, {.i64 = TRI }, 0, NB_CURVES - 1, FLAGS, "curve1" },
354 { "tri", "linear slope", 0, AV_OPT_TYPE_CONST, {.i64 = TRI }, 0, 0, FLAGS, "curve1" },
355 { "qsin", "quarter of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = QSIN }, 0, 0, FLAGS, "curve1" },
356 { "esin", "exponential sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = ESIN }, 0, 0, FLAGS, "curve1" },
357 { "hsin", "half of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = HSIN }, 0, 0, FLAGS, "curve1" },
358 { "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64 = LOG }, 0, 0, FLAGS, "curve1" },
359 { "ipar", "inverted parabola", 0, AV_OPT_TYPE_CONST, {.i64 = IPAR }, 0, 0, FLAGS, "curve1" },
360 { "qua", "quadratic", 0, AV_OPT_TYPE_CONST, {.i64 = QUA }, 0, 0, FLAGS, "curve1" },
361 { "cub", "cubic", 0, AV_OPT_TYPE_CONST, {.i64 = CUB }, 0, 0, FLAGS, "curve1" },
362 { "squ", "square root", 0, AV_OPT_TYPE_CONST, {.i64 = SQU }, 0, 0, FLAGS, "curve1" },
363 { "cbr", "cubic root", 0, AV_OPT_TYPE_CONST, {.i64 = CBR }, 0, 0, FLAGS, "curve1" },
364 { "par", "parabola", 0, AV_OPT_TYPE_CONST, {.i64 = PAR }, 0, 0, FLAGS, "curve1" },
365 { "exp", "exponential", 0, AV_OPT_TYPE_CONST, {.i64 = EXP }, 0, 0, FLAGS, "curve1" },
366 { "iqsin", "inverted quarter of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = IQSIN}, 0, 0, FLAGS, "curve1" },
367 { "ihsin", "inverted half of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = IHSIN}, 0, 0, FLAGS, "curve1" },
368 { "dese", "double-exponential seat", 0, AV_OPT_TYPE_CONST, {.i64 = DESE }, 0, 0, FLAGS, "curve1" },
369 { "desi", "double-exponential sigmoid", 0, AV_OPT_TYPE_CONST, {.i64 = DESI }, 0, 0, FLAGS, "curve1" },
370 { "curve2", "set fade curve type for 2nd stream", OFFSET(curve2), AV_OPT_TYPE_INT, {.i64 = TRI }, 0, NB_CURVES - 1, FLAGS, "curve2" },
371 { "c2", "set fade curve type for 2nd stream", OFFSET(curve2), AV_OPT_TYPE_INT, {.i64 = TRI }, 0, NB_CURVES - 1, FLAGS, "curve2" },
372 { "tri", "linear slope", 0, AV_OPT_TYPE_CONST, {.i64 = TRI }, 0, 0, FLAGS, "curve2" },
373 { "qsin", "quarter of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = QSIN }, 0, 0, FLAGS, "curve2" },
374 { "esin", "exponential sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = ESIN }, 0, 0, FLAGS, "curve2" },
375 { "hsin", "half of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = HSIN }, 0, 0, FLAGS, "curve2" },
376 { "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64 = LOG }, 0, 0, FLAGS, "curve2" },
377 { "ipar", "inverted parabola", 0, AV_OPT_TYPE_CONST, {.i64 = IPAR }, 0, 0, FLAGS, "curve2" },
378 { "qua", "quadratic", 0, AV_OPT_TYPE_CONST, {.i64 = QUA }, 0, 0, FLAGS, "curve2" },
379 { "cub", "cubic", 0, AV_OPT_TYPE_CONST, {.i64 = CUB }, 0, 0, FLAGS, "curve2" },
380 { "squ", "square root", 0, AV_OPT_TYPE_CONST, {.i64 = SQU }, 0, 0, FLAGS, "curve2" },
381 { "cbr", "cubic root", 0, AV_OPT_TYPE_CONST, {.i64 = CBR }, 0, 0, FLAGS, "curve2" },
382 { "par", "parabola", 0, AV_OPT_TYPE_CONST, {.i64 = PAR }, 0, 0, FLAGS, "curve2" },
383 { "exp", "exponential", 0, AV_OPT_TYPE_CONST, {.i64 = EXP }, 0, 0, FLAGS, "curve2" },
384 { "iqsin", "inverted quarter of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = IQSIN}, 0, 0, FLAGS, "curve2" },
385 { "ihsin", "inverted half of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = IHSIN}, 0, 0, FLAGS, "curve2" },
386 { "dese", "double-exponential seat", 0, AV_OPT_TYPE_CONST, {.i64 = DESE }, 0, 0, FLAGS, "curve2" },
387 { "desi", "double-exponential sigmoid", 0, AV_OPT_TYPE_CONST, {.i64 = DESI }, 0, 0, FLAGS, "curve2" },
391 AVFILTER_DEFINE_CLASS(acrossfade);
393 #define CROSSFADE_PLANAR(name, type) \
394 static void crossfade_samples_## name ##p(uint8_t **dst, uint8_t * const *cf0, \
395 uint8_t * const *cf1, \
396 int nb_samples, int channels, \
397 int curve0, int curve1) \
401 for (i = 0; i < nb_samples; i++) { \
402 double gain0 = fade_gain(curve0, nb_samples - 1 - i, nb_samples); \
403 double gain1 = fade_gain(curve1, i, nb_samples); \
404 for (c = 0; c < channels; c++) { \
405 type *d = (type *)dst[c]; \
406 const type *s0 = (type *)cf0[c]; \
407 const type *s1 = (type *)cf1[c]; \
409 d[i] = s0[i] * gain0 + s1[i] * gain1; \
414 #define CROSSFADE(name, type) \
415 static void crossfade_samples_## name (uint8_t **dst, uint8_t * const *cf0, \
416 uint8_t * const *cf1, \
417 int nb_samples, int channels, \
418 int curve0, int curve1) \
420 type *d = (type *)dst[0]; \
421 const type *s0 = (type *)cf0[0]; \
422 const type *s1 = (type *)cf1[0]; \
425 for (i = 0; i < nb_samples; i++) { \
426 double gain0 = fade_gain(curve0, nb_samples - 1 - i, nb_samples); \
427 double gain1 = fade_gain(curve1, i, nb_samples); \
428 for (c = 0; c < channels; c++, k++) \
429 d[k] = s0[k] * gain0 + s1[k] * gain1; \
433 CROSSFADE_PLANAR(dbl, double)
434 CROSSFADE_PLANAR(flt, float)
435 CROSSFADE_PLANAR(s16, int16_t)
436 CROSSFADE_PLANAR(s32, int32_t)
438 CROSSFADE(dbl, double)
439 CROSSFADE(flt, float)
440 CROSSFADE(s16, int16_t)
441 CROSSFADE(s32, int32_t)
443 static int acrossfade_filter_frame(AVFilterLink *inlink, AVFrame *in)
445 AVFilterContext *ctx = inlink->dst;
446 AudioFadeContext *s = ctx->priv;
447 AVFilterLink *outlink = ctx->outputs[0];
448 AVFrame *out, *cf[2] = { NULL };
449 int ret = 0, nb_samples;
451 if (s->crossfade_is_over) {
453 s->pts += av_rescale_q(in->nb_samples,
454 (AVRational){ 1, outlink->sample_rate }, outlink->time_base);
455 return ff_filter_frame(outlink, in);
456 } else if (inlink == ctx->inputs[0]) {
457 av_audio_fifo_write(s->fifo[0], (void **)in->extended_data, in->nb_samples);
459 nb_samples = av_audio_fifo_size(s->fifo[0]) - s->nb_samples;
460 if (nb_samples > 0) {
461 out = ff_get_audio_buffer(outlink, nb_samples);
463 ret = AVERROR(ENOMEM);
466 av_audio_fifo_read(s->fifo[0], (void **)out->extended_data, nb_samples);
468 s->pts += av_rescale_q(nb_samples,
469 (AVRational){ 1, outlink->sample_rate }, outlink->time_base);
470 ret = ff_filter_frame(outlink, out);
472 } else if (av_audio_fifo_size(s->fifo[1]) < s->nb_samples) {
473 if (!s->overlap && av_audio_fifo_size(s->fifo[0]) > 0) {
474 nb_samples = av_audio_fifo_size(s->fifo[0]);
476 cf[0] = ff_get_audio_buffer(outlink, nb_samples);
477 out = ff_get_audio_buffer(outlink, nb_samples);
478 if (!out || !cf[0]) {
479 ret = AVERROR(ENOMEM);
482 av_audio_fifo_read(s->fifo[0], (void **)cf[0]->extended_data, nb_samples);
484 s->fade_samples(out->extended_data, cf[0]->extended_data, nb_samples,
485 outlink->channels, -1, nb_samples - 1, nb_samples, s->curve);
487 s->pts += av_rescale_q(nb_samples,
488 (AVRational){ 1, outlink->sample_rate }, outlink->time_base);
489 ret = ff_filter_frame(outlink, out);
494 av_audio_fifo_write(s->fifo[1], (void **)in->extended_data, in->nb_samples);
495 } else if (av_audio_fifo_size(s->fifo[1]) >= s->nb_samples) {
497 cf[0] = ff_get_audio_buffer(outlink, s->nb_samples);
498 cf[1] = ff_get_audio_buffer(outlink, s->nb_samples);
499 out = ff_get_audio_buffer(outlink, s->nb_samples);
500 if (!out || !cf[0] || !cf[1]) {
502 ret = AVERROR(ENOMEM);
506 av_audio_fifo_read(s->fifo[0], (void **)cf[0]->extended_data, s->nb_samples);
507 av_audio_fifo_read(s->fifo[1], (void **)cf[1]->extended_data, s->nb_samples);
509 s->crossfade_samples(out->extended_data, cf[0]->extended_data,
510 cf[1]->extended_data,
511 s->nb_samples, av_frame_get_channels(in),
512 s->curve, s->curve2);
514 s->pts += av_rescale_q(s->nb_samples,
515 (AVRational){ 1, outlink->sample_rate }, outlink->time_base);
516 ret = ff_filter_frame(outlink, out);
520 out = ff_get_audio_buffer(outlink, s->nb_samples);
521 cf[1] = ff_get_audio_buffer(outlink, s->nb_samples);
522 if (!out || !cf[1]) {
523 ret = AVERROR(ENOMEM);
528 av_audio_fifo_read(s->fifo[1], (void **)cf[1]->extended_data, s->nb_samples);
530 s->fade_samples(out->extended_data, cf[1]->extended_data, s->nb_samples,
531 outlink->channels, 1, 0, s->nb_samples, s->curve2);
533 s->pts += av_rescale_q(s->nb_samples,
534 (AVRational){ 1, outlink->sample_rate }, outlink->time_base);
535 ret = ff_filter_frame(outlink, out);
540 nb_samples = av_audio_fifo_size(s->fifo[1]);
541 if (nb_samples > 0) {
542 out = ff_get_audio_buffer(outlink, nb_samples);
544 ret = AVERROR(ENOMEM);
548 av_audio_fifo_read(s->fifo[1], (void **)out->extended_data, nb_samples);
550 s->pts += av_rescale_q(nb_samples,
551 (AVRational){ 1, outlink->sample_rate }, outlink->time_base);
552 ret = ff_filter_frame(outlink, out);
554 s->crossfade_is_over = 1;
559 av_frame_free(&cf[0]);
560 av_frame_free(&cf[1]);
564 static int acrossfade_request_frame(AVFilterLink *outlink)
566 AVFilterContext *ctx = outlink->src;
567 AudioFadeContext *s = ctx->priv;
571 AVFilterLink *cf0 = ctx->inputs[0];
572 ret = ff_request_frame(cf0);
573 if (ret < 0 && ret != AVERROR_EOF)
575 if (ret == AVERROR_EOF) {
580 AVFilterLink *cf1 = ctx->inputs[1];
581 int nb_samples = av_audio_fifo_size(s->fifo[1]);
583 ret = ff_request_frame(cf1);
584 if (ret == AVERROR_EOF && nb_samples > 0) {
585 AVFrame *out = ff_get_audio_buffer(outlink, nb_samples);
587 return AVERROR(ENOMEM);
589 av_audio_fifo_read(s->fifo[1], (void **)out->extended_data, nb_samples);
590 ret = ff_filter_frame(outlink, out);
597 static int acrossfade_config_output(AVFilterLink *outlink)
599 AVFilterContext *ctx = outlink->src;
600 AudioFadeContext *s = ctx->priv;
602 if (ctx->inputs[0]->sample_rate != ctx->inputs[1]->sample_rate) {
603 av_log(ctx, AV_LOG_ERROR,
604 "Inputs must have the same sample rate "
605 "%d for in0 vs %d for in1\n",
606 ctx->inputs[0]->sample_rate, ctx->inputs[1]->sample_rate);
607 return AVERROR(EINVAL);
610 outlink->sample_rate = ctx->inputs[0]->sample_rate;
611 outlink->time_base = ctx->inputs[0]->time_base;
612 outlink->channel_layout = ctx->inputs[0]->channel_layout;
613 outlink->channels = ctx->inputs[0]->channels;
614 outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;
616 switch (outlink->format) {
617 case AV_SAMPLE_FMT_DBL: s->crossfade_samples = crossfade_samples_dbl; break;
618 case AV_SAMPLE_FMT_DBLP: s->crossfade_samples = crossfade_samples_dblp; break;
619 case AV_SAMPLE_FMT_FLT: s->crossfade_samples = crossfade_samples_flt; break;
620 case AV_SAMPLE_FMT_FLTP: s->crossfade_samples = crossfade_samples_fltp; break;
621 case AV_SAMPLE_FMT_S16: s->crossfade_samples = crossfade_samples_s16; break;
622 case AV_SAMPLE_FMT_S16P: s->crossfade_samples = crossfade_samples_s16p; break;
623 case AV_SAMPLE_FMT_S32: s->crossfade_samples = crossfade_samples_s32; break;
624 case AV_SAMPLE_FMT_S32P: s->crossfade_samples = crossfade_samples_s32p; break;
627 config_output(outlink);
629 s->fifo[0] = av_audio_fifo_alloc(outlink->format, outlink->channels, s->nb_samples);
630 s->fifo[1] = av_audio_fifo_alloc(outlink->format, outlink->channels, s->nb_samples);
631 if (!s->fifo[0] || !s->fifo[1])
632 return AVERROR(ENOMEM);
637 static av_cold void uninit(AVFilterContext *ctx)
639 AudioFadeContext *s = ctx->priv;
641 av_audio_fifo_free(s->fifo[0]);
642 av_audio_fifo_free(s->fifo[1]);
645 static const AVFilterPad avfilter_af_acrossfade_inputs[] = {
647 .name = "crossfade0",
648 .type = AVMEDIA_TYPE_AUDIO,
649 .filter_frame = acrossfade_filter_frame,
652 .name = "crossfade1",
653 .type = AVMEDIA_TYPE_AUDIO,
654 .filter_frame = acrossfade_filter_frame,
659 static const AVFilterPad avfilter_af_acrossfade_outputs[] = {
662 .type = AVMEDIA_TYPE_AUDIO,
663 .request_frame = acrossfade_request_frame,
664 .config_props = acrossfade_config_output,
669 AVFilter ff_af_acrossfade = {
670 .name = "acrossfade",
671 .description = NULL_IF_CONFIG_SMALL("Cross fade two input audio streams."),
672 .query_formats = query_formats,
673 .priv_size = sizeof(AudioFadeContext),
675 .priv_class = &acrossfade_class,
676 .inputs = avfilter_af_acrossfade_inputs,
677 .outputs = avfilter_af_acrossfade_outputs,
680 #endif /* CONFIG_ACROSSFADE_FILTER */