FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavfilter/af_afade.c
Date: 2024-11-20 23:03:26
Exec Total Coverage
Lines: 140 305 45.9%
Functions: 10 33 30.3%
Branches: 72 250 28.8%
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1 /*
2 * Copyright (c) 2013-2015 Paul B Mahol
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 /**
22 * @file
23 * fade audio filter
24 */
25
26 #include "config_components.h"
27
28 #include "libavutil/opt.h"
29 #include "audio.h"
30 #include "avfilter.h"
31 #include "filters.h"
32
33 typedef struct AudioFadeContext {
34 const AVClass *class;
35 int type;
36 int curve, curve2;
37 int64_t nb_samples;
38 int64_t start_sample;
39 int64_t duration;
40 int64_t start_time;
41 double silence;
42 double unity;
43 int overlap;
44 int status[2];
45 int passthrough;
46 int64_t pts;
47
48 void (*fade_samples)(uint8_t **dst, uint8_t * const *src,
49 int nb_samples, int channels, int direction,
50 int64_t start, int64_t range, int curve,
51 double silence, double unity);
52 void (*scale_samples)(uint8_t **dst, uint8_t * const *src,
53 int nb_samples, int channels, double unity);
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 { NONE = -1, TRI, QSIN, ESIN, HSIN, LOG, IPAR, QUA, CUB, SQU, CBR, PAR, EXP, IQSIN, IHSIN, DESE, DESI, LOSI, SINC, ISINC, QUAT, QUATR, QSIN2, HSIN2, NB_CURVES };
61
62 #define OFFSET(x) offsetof(AudioFadeContext, x)
63 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
64 #define TFLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
65
66 static const enum AVSampleFormat sample_fmts[] = {
67 AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S16P,
68 AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_S32P,
69 AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_FLTP,
70 AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_DBLP,
71 AV_SAMPLE_FMT_NONE
72 };
73
74 737552 static double fade_gain(int curve, int64_t index, int64_t range, double silence, double unity)
75 {
76 #define CUBE(a) ((a)*(a)*(a))
77 double gain;
78
79 737552 gain = av_clipd(1.0 * index / range, 0, 1.0);
80
81
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 737552 switch (curve) {
82 90112 case QSIN:
83 90112 gain = sin(gain * M_PI / 2.0);
84 90112 break;
85 90112 case IQSIN:
86 /* 0.6... = 2 / M_PI */
87 90112 gain = 0.6366197723675814 * asin(gain);
88 90112 break;
89 90112 case ESIN:
90 90112 gain = 1.0 - cos(M_PI / 4.0 * (CUBE(2.0*gain - 1) + 1));
91 90112 break;
92 90112 case HSIN:
93 90112 gain = (1.0 - cos(gain * M_PI)) / 2.0;
94 90112 break;
95 ✗ case IHSIN:
96 /* 0.3... = 1 / M_PI */
97 ✗ gain = 0.3183098861837907 * acos(1 - 2 * gain);
98 ✗ break;
99 178312 case EXP:
100 /* -11.5... = 5*ln(0.1) */
101 178312 gain = exp(-11.512925464970227 * (1 - gain));
102 178312 break;
103 198792 case LOG:
104 198792 gain = av_clipd(1 + 0.2 * log10(gain), 0, 1.0);
105 198792 break;
106 ✗ case PAR:
107 ✗ gain = 1 - sqrt(1 - gain);
108 ✗ break;
109 ✗ case IPAR:
110 ✗ gain = (1 - (1 - gain) * (1 - gain));
111 ✗ break;
112 ✗ case QUA:
113 ✗ gain *= gain;
114 ✗ break;
115 ✗ case CUB:
116 ✗ gain = CUBE(gain);
117 ✗ break;
118 ✗ case SQU:
119 ✗ gain = sqrt(gain);
120 ✗ break;
121 ✗ case CBR:
122 ✗ gain = cbrt(gain);
123 ✗ break;
124 ✗ case DESE:
125 ✗ gain = gain <= 0.5 ? cbrt(2 * gain) / 2: 1 - cbrt(2 * (1 - gain)) / 2;
126 ✗ break;
127 ✗ case DESI:
128 ✗ gain = gain <= 0.5 ? CUBE(2 * gain) / 2: 1 - CUBE(2 * (1 - gain)) / 2;
129 ✗ break;
130 ✗ case LOSI: {
131 ✗ const double a = 1. / (1. - 0.787) - 1;
132 ✗ double A = 1. / (1.0 + exp(0 -((gain-0.5) * a * 2.0)));
133 ✗ double B = 1. / (1.0 + exp(a));
134 ✗ double C = 1. / (1.0 + exp(0-a));
135 ✗ gain = (A - B) / (C - B);
136 }
137 ✗ break;
138 ✗ case SINC:
139 ✗ gain = gain >= 1.0 ? 1.0 : sin(M_PI * (1.0 - gain)) / (M_PI * (1.0 - gain));
140 ✗ break;
141 ✗ case ISINC:
142 ✗ gain = gain <= 0.0 ? 0.0 : 1.0 - sin(M_PI * gain) / (M_PI * gain);
143 ✗ break;
144 ✗ case QUAT:
145 ✗ gain = gain * gain * gain * gain;
146 ✗ break;
147 ✗ case QUATR:
148 ✗ gain = pow(gain, 0.25);
149 ✗ break;
150 ✗ case QSIN2:
151 ✗ gain = sin(gain * M_PI / 2.0) * sin(gain * M_PI / 2.0);
152 ✗ break;
153 ✗ case HSIN2:
154 ✗ gain = pow((1.0 - cos(gain * M_PI)) / 2.0, 2.0);
155 ✗ break;
156 ✗ case NONE:
157 ✗ gain = 1.0;
158 ✗ break;
159 }
160
161 737552 return silence + (unity - silence) * gain;
162 }
163
164 #define FADE_PLANAR(name, type) \
165 static void fade_samples_## name ##p(uint8_t **dst, uint8_t * const *src, \
166 int nb_samples, int channels, int dir, \
167 int64_t start, int64_t range,int curve,\
168 double silence, double unity) \
169 { \
170 int i, c; \
171 \
172 for (i = 0; i < nb_samples; i++) { \
173 double gain = fade_gain(curve, start + i * dir,range,silence,unity);\
174 for (c = 0; c < channels; c++) { \
175 type *d = (type *)dst[c]; \
176 const type *s = (type *)src[c]; \
177 \
178 d[i] = s[i] * gain; \
179 } \
180 } \
181 }
182
183 #define FADE(name, type) \
184 static void fade_samples_## name (uint8_t **dst, uint8_t * const *src, \
185 int nb_samples, int channels, int dir, \
186 int64_t start, int64_t range, int curve, \
187 double silence, double unity) \
188 { \
189 type *d = (type *)dst[0]; \
190 const type *s = (type *)src[0]; \
191 int i, c, k = 0; \
192 \
193 for (i = 0; i < nb_samples; i++) { \
194 double gain = fade_gain(curve, start + i * dir,range,silence,unity);\
195 for (c = 0; c < channels; c++, k++) \
196 d[k] = s[k] * gain; \
197 } \
198 }
199
200 ✗ FADE_PLANAR(dbl, double)
201 ✗ FADE_PLANAR(flt, float)
202 ✗ FADE_PLANAR(s16, int16_t)
203 ✗ FADE_PLANAR(s32, int32_t)
204
205 ✗ FADE(dbl, double)
206 ✗ FADE(flt, float)
207
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 1683593 FADE(s16, int16_t)
208 ✗ FADE(s32, int32_t)
209
210 #define SCALE_PLANAR(name, type) \
211 static void scale_samples_## name ##p(uint8_t **dst, uint8_t * const *src, \
212 int nb_samples, int channels, \
213 double gain) \
214 { \
215 int i, c; \
216 \
217 for (i = 0; i < nb_samples; i++) { \
218 for (c = 0; c < channels; c++) { \
219 type *d = (type *)dst[c]; \
220 const type *s = (type *)src[c]; \
221 \
222 d[i] = s[i] * gain; \
223 } \
224 } \
225 }
226
227 #define SCALE(name, type) \
228 static void scale_samples_## name (uint8_t **dst, uint8_t * const *src, \
229 int nb_samples, int channels, double gain)\
230 { \
231 type *d = (type *)dst[0]; \
232 const type *s = (type *)src[0]; \
233 int i, c, k = 0; \
234 \
235 for (i = 0; i < nb_samples; i++) { \
236 for (c = 0; c < channels; c++, k++) \
237 d[k] = s[k] * gain; \
238 } \
239 }
240
241 ✗ SCALE_PLANAR(dbl, double)
242 ✗ SCALE_PLANAR(flt, float)
243 ✗ SCALE_PLANAR(s16, int16_t)
244 ✗ SCALE_PLANAR(s32, int32_t)
245
246 ✗ SCALE(dbl, double)
247 ✗ SCALE(flt, float)
248 ✗ SCALE(s16, int16_t)
249 ✗ SCALE(s32, int32_t)
250
251 7 static int config_output(AVFilterLink *outlink)
252 {
253 7 AVFilterContext *ctx = outlink->src;
254 7 AudioFadeContext *s = ctx->priv;
255
256
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 7 switch (outlink->format) {
257 ✗ case AV_SAMPLE_FMT_DBL: s->fade_samples = fade_samples_dbl;
258 ✗ s->scale_samples = scale_samples_dbl;
259 ✗ break;
260 ✗ case AV_SAMPLE_FMT_DBLP: s->fade_samples = fade_samples_dblp;
261 ✗ s->scale_samples = scale_samples_dblp;
262 ✗ break;
263 ✗ case AV_SAMPLE_FMT_FLT: s->fade_samples = fade_samples_flt;
264 ✗ s->scale_samples = scale_samples_flt;
265 ✗ break;
266 ✗ case AV_SAMPLE_FMT_FLTP: s->fade_samples = fade_samples_fltp;
267 ✗ s->scale_samples = scale_samples_fltp;
268 ✗ break;
269 7 case AV_SAMPLE_FMT_S16: s->fade_samples = fade_samples_s16;
270 7 s->scale_samples = scale_samples_s16;
271 7 break;
272 ✗ case AV_SAMPLE_FMT_S16P: s->fade_samples = fade_samples_s16p;
273 ✗ s->scale_samples = scale_samples_s16p;
274 ✗ break;
275 ✗ case AV_SAMPLE_FMT_S32: s->fade_samples = fade_samples_s32;
276 ✗ s->scale_samples = scale_samples_s32;
277 ✗ break;
278 ✗ case AV_SAMPLE_FMT_S32P: s->fade_samples = fade_samples_s32p;
279 ✗ s->scale_samples = scale_samples_s32p;
280 ✗ break;
281 }
282
283
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 7 if (s->duration)
284 7 s->nb_samples = av_rescale(s->duration, outlink->sample_rate, AV_TIME_BASE);
285 7 s->duration = 0;
286
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 7 if (s->start_time)
287 ✗ s->start_sample = av_rescale(s->start_time, outlink->sample_rate, AV_TIME_BASE);
288 7 s->start_time = 0;
289
290 7 return 0;
291 }
292
293 #if CONFIG_AFADE_FILTER
294
295 static const AVOption afade_options[] = {
296 { "type", "set the fade direction", OFFSET(type), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, TFLAGS, .unit = "type" },
297 { "t", "set the fade direction", OFFSET(type), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, TFLAGS, .unit = "type" },
298 { "in", "fade-in", 0, AV_OPT_TYPE_CONST, {.i64 = 0 }, 0, 0, TFLAGS, .unit = "type" },
299 { "out", "fade-out", 0, AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 0, TFLAGS, .unit = "type" },
300 { "start_sample", "set number of first sample to start fading", OFFSET(start_sample), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, INT64_MAX, TFLAGS },
301 { "ss", "set number of first sample to start fading", OFFSET(start_sample), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, INT64_MAX, TFLAGS },
302 { "nb_samples", "set number of samples for fade duration", OFFSET(nb_samples), AV_OPT_TYPE_INT64, {.i64 = 44100}, 1, INT64_MAX, TFLAGS },
303 { "ns", "set number of samples for fade duration", OFFSET(nb_samples), AV_OPT_TYPE_INT64, {.i64 = 44100}, 1, INT64_MAX, TFLAGS },
304 { "start_time", "set time to start fading", OFFSET(start_time), AV_OPT_TYPE_DURATION, {.i64 = 0 }, 0, INT64_MAX, TFLAGS },
305 { "st", "set time to start fading", OFFSET(start_time), AV_OPT_TYPE_DURATION, {.i64 = 0 }, 0, INT64_MAX, TFLAGS },
306 { "duration", "set fade duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = 0 }, 0, INT64_MAX, TFLAGS },
307 { "d", "set fade duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = 0 }, 0, INT64_MAX, TFLAGS },
308 { "curve", "set fade curve type", OFFSET(curve), AV_OPT_TYPE_INT, {.i64 = TRI }, NONE, NB_CURVES - 1, TFLAGS, .unit = "curve" },
309 { "c", "set fade curve type", OFFSET(curve), AV_OPT_TYPE_INT, {.i64 = TRI }, NONE, NB_CURVES - 1, TFLAGS, .unit = "curve" },
310 { "nofade", "no fade; keep audio as-is", 0, AV_OPT_TYPE_CONST, {.i64 = NONE }, 0, 0, TFLAGS, .unit = "curve" },
311 { "tri", "linear slope", 0, AV_OPT_TYPE_CONST, {.i64 = TRI }, 0, 0, TFLAGS, .unit = "curve" },
312 { "qsin", "quarter of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = QSIN }, 0, 0, TFLAGS, .unit = "curve" },
313 { "esin", "exponential sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = ESIN }, 0, 0, TFLAGS, .unit = "curve" },
314 { "hsin", "half of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = HSIN }, 0, 0, TFLAGS, .unit = "curve" },
315 { "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64 = LOG }, 0, 0, TFLAGS, .unit = "curve" },
316 { "ipar", "inverted parabola", 0, AV_OPT_TYPE_CONST, {.i64 = IPAR }, 0, 0, TFLAGS, .unit = "curve" },
317 { "qua", "quadratic", 0, AV_OPT_TYPE_CONST, {.i64 = QUA }, 0, 0, TFLAGS, .unit = "curve" },
318 { "cub", "cubic", 0, AV_OPT_TYPE_CONST, {.i64 = CUB }, 0, 0, TFLAGS, .unit = "curve" },
319 { "squ", "square root", 0, AV_OPT_TYPE_CONST, {.i64 = SQU }, 0, 0, TFLAGS, .unit = "curve" },
320 { "cbr", "cubic root", 0, AV_OPT_TYPE_CONST, {.i64 = CBR }, 0, 0, TFLAGS, .unit = "curve" },
321 { "par", "parabola", 0, AV_OPT_TYPE_CONST, {.i64 = PAR }, 0, 0, TFLAGS, .unit = "curve" },
322 { "exp", "exponential", 0, AV_OPT_TYPE_CONST, {.i64 = EXP }, 0, 0, TFLAGS, .unit = "curve" },
323 { "iqsin", "inverted quarter of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = IQSIN}, 0, 0, TFLAGS, .unit = "curve" },
324 { "ihsin", "inverted half of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = IHSIN}, 0, 0, TFLAGS, .unit = "curve" },
325 { "dese", "double-exponential seat", 0, AV_OPT_TYPE_CONST, {.i64 = DESE }, 0, 0, TFLAGS, .unit = "curve" },
326 { "desi", "double-exponential sigmoid", 0, AV_OPT_TYPE_CONST, {.i64 = DESI }, 0, 0, TFLAGS, .unit = "curve" },
327 { "losi", "logistic sigmoid", 0, AV_OPT_TYPE_CONST, {.i64 = LOSI }, 0, 0, TFLAGS, .unit = "curve" },
328 { "sinc", "sine cardinal function", 0, AV_OPT_TYPE_CONST, {.i64 = SINC }, 0, 0, TFLAGS, .unit = "curve" },
329 { "isinc", "inverted sine cardinal function", 0, AV_OPT_TYPE_CONST, {.i64 = ISINC}, 0, 0, TFLAGS, .unit = "curve" },
330 { "quat", "quartic", 0, AV_OPT_TYPE_CONST, {.i64 = QUAT }, 0, 0, TFLAGS, .unit = "curve" },
331 { "quatr", "quartic root", 0, AV_OPT_TYPE_CONST, {.i64 = QUATR}, 0, 0, TFLAGS, .unit = "curve" },
332 { "qsin2", "squared quarter of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = QSIN2}, 0, 0, TFLAGS, .unit = "curve" },
333 { "hsin2", "squared half of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = HSIN2}, 0, 0, TFLAGS, .unit = "curve" },
334 { "silence", "set the silence gain", OFFSET(silence), AV_OPT_TYPE_DOUBLE, {.dbl = 0 }, 0, 1, TFLAGS },
335 { "unity", "set the unity gain", OFFSET(unity), AV_OPT_TYPE_DOUBLE, {.dbl = 1 }, 0, 1, TFLAGS },
336 { NULL }
337 };
338
339 AVFILTER_DEFINE_CLASS(afade);
340
341 12 static av_cold int init(AVFilterContext *ctx)
342 {
343 12 AudioFadeContext *s = ctx->priv;
344
345
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 12 if (INT64_MAX - s->nb_samples < s->start_sample)
346 ✗ return AVERROR(EINVAL);
347
348 12 return 0;
349 }
350
351 390 static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
352 {
353 390 AudioFadeContext *s = inlink->dst->priv;
354 390 AVFilterLink *outlink = inlink->dst->outputs[0];
355 390 int nb_samples = buf->nb_samples;
356 AVFrame *out_buf;
357 390 int64_t cur_sample = av_rescale_q(buf->pts, inlink->time_base, (AVRational){1, inlink->sample_rate});
358
359
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 390 if (s->unity == 1.0 &&
360
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 390 ((!s->type && (s->start_sample + s->nb_samples < cur_sample)) ||
361
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 137 ( s->type && (cur_sample + nb_samples < s->start_sample))))
362 253 return ff_filter_frame(outlink, buf);
363
364
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 137 if (av_frame_is_writable(buf)) {
365 137 out_buf = buf;
366 } else {
367 ✗ out_buf = ff_get_audio_buffer(outlink, nb_samples);
368 ✗ if (!out_buf)
369 ✗ return AVERROR(ENOMEM);
370 ✗ av_frame_copy_props(out_buf, buf);
371 }
372
373
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 137 if ((!s->type && (cur_sample + nb_samples < s->start_sample)) ||
374
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 137 ( s->type && (s->start_sample + s->nb_samples < cur_sample))) {
375 ✗ if (s->silence == 0.) {
376 ✗ av_samples_set_silence(out_buf->extended_data, 0, nb_samples,
377 ✗ out_buf->ch_layout.nb_channels, out_buf->format);
378 } else {
379 ✗ s->scale_samples(out_buf->extended_data, buf->extended_data,
380 ✗ nb_samples, buf->ch_layout.nb_channels,
381 s->silence);
382 }
383
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 137 } else if (( s->type && (cur_sample + nb_samples < s->start_sample)) ||
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 137 (!s->type && (s->start_sample + s->nb_samples < cur_sample))) {
385 ✗ s->scale_samples(out_buf->extended_data, buf->extended_data,
386 ✗ nb_samples, buf->ch_layout.nb_channels,
387 s->unity);
388 } else {
389 int64_t start;
390
391
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 137 if (!s->type)
392 137 start = cur_sample - s->start_sample;
393 else
394 ✗ start = s->start_sample + s->nb_samples - cur_sample;
395
396 137 s->fade_samples(out_buf->extended_data, buf->extended_data,
397 137 nb_samples, buf->ch_layout.nb_channels,
398
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 137 s->type ? -1 : 1, start,
399 s->nb_samples, s->curve, s->silence, s->unity);
400 }
401
402
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 137 if (buf != out_buf)
403 ✗ av_frame_free(&buf);
404
405 137 return ff_filter_frame(outlink, out_buf);
406 }
407
408 ✗ static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
409 char *res, int res_len, int flags)
410 {
411 int ret;
412
413 ✗ ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
414 ✗ if (ret < 0)
415 ✗ return ret;
416
417 ✗ return config_output(ctx->outputs[0]);
418 }
419
420 static const AVFilterPad avfilter_af_afade_inputs[] = {
421 {
422 .name = "default",
423 .type = AVMEDIA_TYPE_AUDIO,
424 .filter_frame = filter_frame,
425 },
426 };
427
428 static const AVFilterPad avfilter_af_afade_outputs[] = {
429 {
430 .name = "default",
431 .type = AVMEDIA_TYPE_AUDIO,
432 .config_props = config_output,
433 },
434 };
435
436 const AVFilter ff_af_afade = {
437 .name = "afade",
438 .description = NULL_IF_CONFIG_SMALL("Fade in/out input audio."),
439 .priv_size = sizeof(AudioFadeContext),
440 .init = init,
441 FILTER_INPUTS(avfilter_af_afade_inputs),
442 FILTER_OUTPUTS(avfilter_af_afade_outputs),
443 FILTER_SAMPLEFMTS_ARRAY(sample_fmts),
444 .priv_class = &afade_class,
445 .process_command = process_command,
446 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
447 };
448
449 #endif /* CONFIG_AFADE_FILTER */
450
451 #if CONFIG_ACROSSFADE_FILTER
452
453 static const AVOption acrossfade_options[] = {
454 { "nb_samples", "set number of samples for cross fade duration", OFFSET(nb_samples), AV_OPT_TYPE_INT64, {.i64 = 44100}, 1, INT32_MAX/10, FLAGS },
455 { "ns", "set number of samples for cross fade duration", OFFSET(nb_samples), AV_OPT_TYPE_INT64, {.i64 = 44100}, 1, INT32_MAX/10, FLAGS },
456 { "duration", "set cross fade duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = 0 }, 0, 60000000, FLAGS },
457 { "d", "set cross fade duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = 0 }, 0, 60000000, FLAGS },
458 { "overlap", "overlap 1st stream end with 2nd stream start", OFFSET(overlap), AV_OPT_TYPE_BOOL, {.i64 = 1 }, 0, 1, FLAGS },
459 { "o", "overlap 1st stream end with 2nd stream start", OFFSET(overlap), AV_OPT_TYPE_BOOL, {.i64 = 1 }, 0, 1, FLAGS },
460 { "curve1", "set fade curve type for 1st stream", OFFSET(curve), AV_OPT_TYPE_INT, {.i64 = TRI }, NONE, NB_CURVES - 1, FLAGS, .unit = "curve" },
461 { "c1", "set fade curve type for 1st stream", OFFSET(curve), AV_OPT_TYPE_INT, {.i64 = TRI }, NONE, NB_CURVES - 1, FLAGS, .unit = "curve" },
462 { "nofade", "no fade; keep audio as-is", 0, AV_OPT_TYPE_CONST, {.i64 = NONE }, 0, 0, FLAGS, .unit = "curve" },
463 { "tri", "linear slope", 0, AV_OPT_TYPE_CONST, {.i64 = TRI }, 0, 0, FLAGS, .unit = "curve" },
464 { "qsin", "quarter of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = QSIN }, 0, 0, FLAGS, .unit = "curve" },
465 { "esin", "exponential sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = ESIN }, 0, 0, FLAGS, .unit = "curve" },
466 { "hsin", "half of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = HSIN }, 0, 0, FLAGS, .unit = "curve" },
467 { "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64 = LOG }, 0, 0, FLAGS, .unit = "curve" },
468 { "ipar", "inverted parabola", 0, AV_OPT_TYPE_CONST, {.i64 = IPAR }, 0, 0, FLAGS, .unit = "curve" },
469 { "qua", "quadratic", 0, AV_OPT_TYPE_CONST, {.i64 = QUA }, 0, 0, FLAGS, .unit = "curve" },
470 { "cub", "cubic", 0, AV_OPT_TYPE_CONST, {.i64 = CUB }, 0, 0, FLAGS, .unit = "curve" },
471 { "squ", "square root", 0, AV_OPT_TYPE_CONST, {.i64 = SQU }, 0, 0, FLAGS, .unit = "curve" },
472 { "cbr", "cubic root", 0, AV_OPT_TYPE_CONST, {.i64 = CBR }, 0, 0, FLAGS, .unit = "curve" },
473 { "par", "parabola", 0, AV_OPT_TYPE_CONST, {.i64 = PAR }, 0, 0, FLAGS, .unit = "curve" },
474 { "exp", "exponential", 0, AV_OPT_TYPE_CONST, {.i64 = EXP }, 0, 0, FLAGS, .unit = "curve" },
475 { "iqsin", "inverted quarter of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = IQSIN}, 0, 0, FLAGS, .unit = "curve" },
476 { "ihsin", "inverted half of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = IHSIN}, 0, 0, FLAGS, .unit = "curve" },
477 { "dese", "double-exponential seat", 0, AV_OPT_TYPE_CONST, {.i64 = DESE }, 0, 0, FLAGS, .unit = "curve" },
478 { "desi", "double-exponential sigmoid", 0, AV_OPT_TYPE_CONST, {.i64 = DESI }, 0, 0, FLAGS, .unit = "curve" },
479 { "losi", "logistic sigmoid", 0, AV_OPT_TYPE_CONST, {.i64 = LOSI }, 0, 0, FLAGS, .unit = "curve" },
480 { "sinc", "sine cardinal function", 0, AV_OPT_TYPE_CONST, {.i64 = SINC }, 0, 0, FLAGS, .unit = "curve" },
481 { "isinc", "inverted sine cardinal function", 0, AV_OPT_TYPE_CONST, {.i64 = ISINC}, 0, 0, FLAGS, .unit = "curve" },
482 { "quat", "quartic", 0, AV_OPT_TYPE_CONST, {.i64 = QUAT }, 0, 0, FLAGS, .unit = "curve" },
483 { "quatr", "quartic root", 0, AV_OPT_TYPE_CONST, {.i64 = QUATR}, 0, 0, FLAGS, .unit = "curve" },
484 { "qsin2", "squared quarter of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = QSIN2}, 0, 0, FLAGS, .unit = "curve" },
485 { "hsin2", "squared half of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = HSIN2}, 0, 0, FLAGS, .unit = "curve" },
486 { "curve2", "set fade curve type for 2nd stream", OFFSET(curve2), AV_OPT_TYPE_INT, {.i64 = TRI }, NONE, NB_CURVES - 1, FLAGS, .unit = "curve" },
487 { "c2", "set fade curve type for 2nd stream", OFFSET(curve2), AV_OPT_TYPE_INT, {.i64 = TRI }, NONE, NB_CURVES - 1, FLAGS, .unit = "curve" },
488 { NULL }
489 };
490
491 AVFILTER_DEFINE_CLASS(acrossfade);
492
493 #define CROSSFADE_PLANAR(name, type) \
494 static void crossfade_samples_## name ##p(uint8_t **dst, uint8_t * const *cf0, \
495 uint8_t * const *cf1, \
496 int nb_samples, int channels, \
497 int curve0, int curve1) \
498 { \
499 int i, c; \
500 \
501 for (i = 0; i < nb_samples; i++) { \
502 double gain0 = fade_gain(curve0, nb_samples - 1 - i, nb_samples,0.,1.);\
503 double gain1 = fade_gain(curve1, i, nb_samples, 0., 1.); \
504 for (c = 0; c < channels; c++) { \
505 type *d = (type *)dst[c]; \
506 const type *s0 = (type *)cf0[c]; \
507 const type *s1 = (type *)cf1[c]; \
508 \
509 d[i] = s0[i] * gain0 + s1[i] * gain1; \
510 } \
511 } \
512 }
513
514 #define CROSSFADE(name, type) \
515 static void crossfade_samples_## name (uint8_t **dst, uint8_t * const *cf0, \
516 uint8_t * const *cf1, \
517 int nb_samples, int channels, \
518 int curve0, int curve1) \
519 { \
520 type *d = (type *)dst[0]; \
521 const type *s0 = (type *)cf0[0]; \
522 const type *s1 = (type *)cf1[0]; \
523 int i, c, k = 0; \
524 \
525 for (i = 0; i < nb_samples; i++) { \
526 double gain0 = fade_gain(curve0, nb_samples - 1-i,nb_samples,0.,1.);\
527 double gain1 = fade_gain(curve1, i, nb_samples, 0., 1.); \
528 for (c = 0; c < channels; c++, k++) \
529 d[k] = s0[k] * gain0 + s1[k] * gain1; \
530 } \
531 }
532
533 ✗ CROSSFADE_PLANAR(dbl, double)
534 ✗ CROSSFADE_PLANAR(flt, float)
535 ✗ CROSSFADE_PLANAR(s16, int16_t)
536 ✗ CROSSFADE_PLANAR(s32, int32_t)
537
538 ✗ CROSSFADE(dbl, double)
539 ✗ CROSSFADE(flt, float)
540
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 264601 CROSSFADE(s16, int16_t)
541 ✗ CROSSFADE(s32, int32_t)
542
543 151 static int check_input(AVFilterLink *inlink)
544 {
545 151 const int queued_samples = ff_inlink_queued_samples(inlink);
546
547 151 return ff_inlink_check_available_samples(inlink, queued_samples + 1) == 1;
548 }
549
550 290 static int activate(AVFilterContext *ctx)
551 {
552 290 AudioFadeContext *s = ctx->priv;
553 290 AVFilterLink *outlink = ctx->outputs[0];
554 290 AVFrame *in = NULL, *out, *cf[2] = { NULL };
555 290 int ret = 0, nb_samples, status;
556 int64_t pts;
557
558
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 292 FF_FILTER_FORWARD_STATUS_BACK_ALL(outlink, ctx);
559
560
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 289 if (s->passthrough && s->status[0]) {
561 165 ret = ff_inlink_consume_frame(ctx->inputs[1], &in);
562
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 165 if (ret > 0) {
563 82 in->pts = s->pts;
564 82 s->pts += av_rescale_q(in->nb_samples,
565 82 (AVRational){ 1, outlink->sample_rate }, outlink->time_base);
566 82 return ff_filter_frame(outlink, in);
567
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 83 } else if (ret < 0) {
568 ✗ return ret;
569
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 83 } else if (ff_inlink_acknowledge_status(ctx->inputs[1], &status, &pts)) {
570 1 ff_outlink_set_status(outlink, status, pts);
571 1 return 0;
572
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573
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 82 if (ff_outlink_frame_wanted(outlink)) {
574 82 ff_inlink_request_frame(ctx->inputs[1]);
575 82 return 0;
576 }
577 }
578 }
579
580 124 nb_samples = ff_inlink_queued_samples(ctx->inputs[0]);
581
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 124 if (nb_samples > s->nb_samples) {
582 44 nb_samples -= s->nb_samples;
583 44 s->passthrough = 1;
584 44 ret = ff_inlink_consume_samples(ctx->inputs[0], nb_samples, nb_samples, &in);
585
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 44 if (ret < 0)
586 ✗ return ret;
587 44 in->pts = s->pts;
588 44 s->pts += av_rescale_q(in->nb_samples,
589 44 (AVRational){ 1, outlink->sample_rate }, outlink->time_base);
590 44 return ff_filter_frame(outlink, in);
591
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592
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 6 ff_inlink_queued_samples(ctx->inputs[1]) >= s->nb_samples) {
593
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594 1 out = ff_get_audio_buffer(outlink, s->nb_samples);
595
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 1 if (!out)
596 ✗ return AVERROR(ENOMEM);
597
598 1 ret = ff_inlink_consume_samples(ctx->inputs[0], s->nb_samples, s->nb_samples, &cf[0]);
599
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 1 if (ret < 0) {
600 ✗ av_frame_free(&out);
601 ✗ return ret;
602 }
603
604 1 ret = ff_inlink_consume_samples(ctx->inputs[1], s->nb_samples, s->nb_samples, &cf[1]);
605
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 1 if (ret < 0) {
606 ✗ av_frame_free(&out);
607 ✗ return ret;
608 }
609
610 1 s->crossfade_samples(out->extended_data, cf[0]->extended_data,
611 1 cf[1]->extended_data,
612 1 s->nb_samples, out->ch_layout.nb_channels,
613 s->curve, s->curve2);
614 1 out->pts = s->pts;
615 1 s->pts += av_rescale_q(s->nb_samples,
616 1 (AVRational){ 1, outlink->sample_rate }, outlink->time_base);
617 1 s->passthrough = 1;
618 1 av_frame_free(&cf[0]);
619 1 av_frame_free(&cf[1]);
620 1 return ff_filter_frame(outlink, out);
621 } else {
622 ✗ out = ff_get_audio_buffer(outlink, s->nb_samples);
623 ✗ if (!out)
624 ✗ return AVERROR(ENOMEM);
625
626 ✗ ret = ff_inlink_consume_samples(ctx->inputs[0], s->nb_samples, s->nb_samples, &cf[0]);
627 ✗ if (ret < 0) {
628 ✗ av_frame_free(&out);
629 ✗ return ret;
630 }
631
632 ✗ s->fade_samples(out->extended_data, cf[0]->extended_data, s->nb_samples,
633 ✗ outlink->ch_layout.nb_channels, -1, s->nb_samples - 1, s->nb_samples, s->curve, 0., 1.);
634 ✗ out->pts = s->pts;
635 ✗ s->pts += av_rescale_q(s->nb_samples,
636 ✗ (AVRational){ 1, outlink->sample_rate }, outlink->time_base);
637 ✗ av_frame_free(&cf[0]);
638 ✗ ret = ff_filter_frame(outlink, out);
639 ✗ if (ret < 0)
640 ✗ return ret;
641
642 ✗ out = ff_get_audio_buffer(outlink, s->nb_samples);
643 ✗ if (!out)
644 ✗ return AVERROR(ENOMEM);
645
646 ✗ ret = ff_inlink_consume_samples(ctx->inputs[1], s->nb_samples, s->nb_samples, &cf[1]);
647 ✗ if (ret < 0) {
648 ✗ av_frame_free(&out);
649 ✗ return ret;
650 }
651
652 ✗ s->fade_samples(out->extended_data, cf[1]->extended_data, s->nb_samples,
653 outlink->ch_layout.nb_channels, 1, 0, s->nb_samples, s->curve2, 0., 1.);
654 ✗ out->pts = s->pts;
655 ✗ s->pts += av_rescale_q(s->nb_samples,
656 ✗ (AVRational){ 1, outlink->sample_rate }, outlink->time_base);
657 ✗ s->passthrough = 1;
658 ✗ av_frame_free(&cf[1]);
659 ✗ return ff_filter_frame(outlink, out);
660 }
661
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 79 } else if (ff_outlink_frame_wanted(outlink)) {
662
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 78 if (!s->status[0] && check_input(ctx->inputs[0]))
663 1 s->status[0] = AVERROR_EOF;
664 78 s->passthrough = !s->status[0];
665
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 78 if (check_input(ctx->inputs[1])) {
666 ✗ s->status[1] = AVERROR_EOF;
667 ✗ ff_outlink_set_status(outlink, AVERROR_EOF, AV_NOPTS_VALUE);
668 ✗ return 0;
669 }
670
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 78 if (!s->status[0])
671 72 ff_inlink_request_frame(ctx->inputs[0]);
672 else
673 6 ff_inlink_request_frame(ctx->inputs[1]);
674 78 return 0;
675 }
676
677 1 return ret;
678 }
679
680 1 static int acrossfade_config_output(AVFilterLink *outlink)
681 {
682 1 AVFilterContext *ctx = outlink->src;
683 1 AudioFadeContext *s = ctx->priv;
684
685 1 outlink->time_base = ctx->inputs[0]->time_base;
686
687
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 1 switch (outlink->format) {
688 ✗ case AV_SAMPLE_FMT_DBL: s->crossfade_samples = crossfade_samples_dbl; break;
689 ✗ case AV_SAMPLE_FMT_DBLP: s->crossfade_samples = crossfade_samples_dblp; break;
690 ✗ case AV_SAMPLE_FMT_FLT: s->crossfade_samples = crossfade_samples_flt; break;
691 ✗ case AV_SAMPLE_FMT_FLTP: s->crossfade_samples = crossfade_samples_fltp; break;
692 1 case AV_SAMPLE_FMT_S16: s->crossfade_samples = crossfade_samples_s16; break;
693 ✗ case AV_SAMPLE_FMT_S16P: s->crossfade_samples = crossfade_samples_s16p; break;
694 ✗ case AV_SAMPLE_FMT_S32: s->crossfade_samples = crossfade_samples_s32; break;
695 ✗ case AV_SAMPLE_FMT_S32P: s->crossfade_samples = crossfade_samples_s32p; break;
696 }
697
698 1 config_output(outlink);
699
700 1 return 0;
701 }
702
703 47 static AVFrame *get_audio_buffer(AVFilterLink *inlink, int nb_samples)
704 {
705 47 AVFilterContext *ctx = inlink->dst;
706 47 AudioFadeContext *s = ctx->priv;
707
708 47 return s->passthrough ?
709
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 49 ff_null_get_audio_buffer (inlink, nb_samples) :
710 2 ff_default_get_audio_buffer(inlink, nb_samples);
711 }
712
713 static const AVFilterPad avfilter_af_acrossfade_inputs[] = {
714 {
715 .name = "crossfade0",
716 .type = AVMEDIA_TYPE_AUDIO,
717 .get_buffer.audio = get_audio_buffer,
718 },
719 {
720 .name = "crossfade1",
721 .type = AVMEDIA_TYPE_AUDIO,
722 .get_buffer.audio = get_audio_buffer,
723 },
724 };
725
726 static const AVFilterPad avfilter_af_acrossfade_outputs[] = {
727 {
728 .name = "default",
729 .type = AVMEDIA_TYPE_AUDIO,
730 .config_props = acrossfade_config_output,
731 },
732 };
733
734 const AVFilter ff_af_acrossfade = {
735 .name = "acrossfade",
736 .description = NULL_IF_CONFIG_SMALL("Cross fade two input audio streams."),
737 .priv_size = sizeof(AudioFadeContext),
738 .activate = activate,
739 .priv_class = &acrossfade_class,
740 FILTER_INPUTS(avfilter_af_acrossfade_inputs),
741 FILTER_OUTPUTS(avfilter_af_acrossfade_outputs),
742 FILTER_SAMPLEFMTS_ARRAY(sample_fmts),
743 };
744
745 #endif /* CONFIG_ACROSSFADE_FILTER */
746