12f5d24ba0f60eaea0bb9aa4470b6b5c4902e7b2
[libav.git] / libavresample / audio_mix.c
1 /*
2 * Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
3 *
4 * This file is part of Libav.
5 *
6 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include <stdint.h>
22
23 #include "libavutil/common.h"
24 #include "libavutil/libm.h"
25 #include "libavutil/samplefmt.h"
26 #include "avresample.h"
27 #include "internal.h"
28 #include "audio_data.h"
29 #include "audio_mix.h"
30
31 static const char *coeff_type_names[] = { "q8", "q15", "flt" };
32
33 struct AudioMix {
34 AVAudioResampleContext *avr;
35 enum AVSampleFormat fmt;
36 enum AVMixCoeffType coeff_type;
37 uint64_t in_layout;
38 uint64_t out_layout;
39 int in_channels;
40 int out_channels;
41
42 int ptr_align;
43 int samples_align;
44 int has_optimized_func;
45 const char *func_descr;
46 const char *func_descr_generic;
47 mix_func *mix;
48 mix_func *mix_generic;
49
50 int in_matrix_channels;
51 int out_matrix_channels;
52 int output_zero[AVRESAMPLE_MAX_CHANNELS];
53 int input_skip[AVRESAMPLE_MAX_CHANNELS];
54 int output_skip[AVRESAMPLE_MAX_CHANNELS];
55 int16_t *matrix_q8[AVRESAMPLE_MAX_CHANNELS];
56 int32_t *matrix_q15[AVRESAMPLE_MAX_CHANNELS];
57 float *matrix_flt[AVRESAMPLE_MAX_CHANNELS];
58 void **matrix;
59 };
60
61 void ff_audio_mix_set_func(AudioMix *am, enum AVSampleFormat fmt,
62 enum AVMixCoeffType coeff_type, int in_channels,
63 int out_channels, int ptr_align, int samples_align,
64 const char *descr, void *mix_func)
65 {
66 if (fmt == am->fmt && coeff_type == am->coeff_type &&
67 ( in_channels == am->in_matrix_channels || in_channels == 0) &&
68 (out_channels == am->out_matrix_channels || out_channels == 0)) {
69 char chan_str[16];
70 am->mix = mix_func;
71 am->func_descr = descr;
72 am->ptr_align = ptr_align;
73 am->samples_align = samples_align;
74 if (ptr_align == 1 && samples_align == 1) {
75 am->mix_generic = mix_func;
76 am->func_descr_generic = descr;
77 } else {
78 am->has_optimized_func = 1;
79 }
80 if (in_channels) {
81 if (out_channels)
82 snprintf(chan_str, sizeof(chan_str), "[%d to %d] ",
83 in_channels, out_channels);
84 else
85 snprintf(chan_str, sizeof(chan_str), "[%d to any] ",
86 in_channels);
87 } else if (out_channels) {
88 snprintf(chan_str, sizeof(chan_str), "[any to %d] ",
89 out_channels);
90 } else {
91 snprintf(chan_str, sizeof(chan_str), "[any to any] ");
92 }
93 av_log(am->avr, AV_LOG_DEBUG, "audio_mix: found function: [fmt=%s] "
94 "[c=%s] %s(%s)\n", av_get_sample_fmt_name(fmt),
95 coeff_type_names[coeff_type], chan_str, descr);
96 }
97 }
98
99 #define MIX_FUNC_NAME(fmt, cfmt) mix_any_ ## fmt ##_## cfmt ##_c
100
101 #define MIX_FUNC_GENERIC(fmt, cfmt, stype, ctype, sumtype, expr) \
102 static void MIX_FUNC_NAME(fmt, cfmt)(stype **samples, ctype **matrix, \
103 int len, int out_ch, int in_ch) \
104 { \
105 int i, in, out; \
106 stype temp[AVRESAMPLE_MAX_CHANNELS]; \
107 for (i = 0; i < len; i++) { \
108 for (out = 0; out < out_ch; out++) { \
109 sumtype sum = 0; \
110 for (in = 0; in < in_ch; in++) \
111 sum += samples[in][i] * matrix[out][in]; \
112 temp[out] = expr; \
113 } \
114 for (out = 0; out < out_ch; out++) \
115 samples[out][i] = temp[out]; \
116 } \
117 }
118
119 MIX_FUNC_GENERIC(FLTP, FLT, float, float, float, sum)
120 MIX_FUNC_GENERIC(S16P, FLT, int16_t, float, float, av_clip_int16(lrintf(sum)))
121 MIX_FUNC_GENERIC(S16P, Q15, int16_t, int32_t, int64_t, av_clip_int16(sum >> 15))
122 MIX_FUNC_GENERIC(S16P, Q8, int16_t, int16_t, int32_t, av_clip_int16(sum >> 8))
123
124 /* TODO: templatize the channel-specific C functions */
125
126 static void mix_2_to_1_fltp_flt_c(float **samples, float **matrix, int len,
127 int out_ch, int in_ch)
128 {
129 float *src0 = samples[0];
130 float *src1 = samples[1];
131 float *dst = src0;
132 float m0 = matrix[0][0];
133 float m1 = matrix[0][1];
134
135 while (len > 4) {
136 *dst++ = *src0++ * m0 + *src1++ * m1;
137 *dst++ = *src0++ * m0 + *src1++ * m1;
138 *dst++ = *src0++ * m0 + *src1++ * m1;
139 *dst++ = *src0++ * m0 + *src1++ * m1;
140 len -= 4;
141 }
142 while (len > 0) {
143 *dst++ = *src0++ * m0 + *src1++ * m1;
144 len--;
145 }
146 }
147
148 static void mix_2_to_1_s16p_flt_c(int16_t **samples, float **matrix, int len,
149 int out_ch, int in_ch)
150 {
151 int16_t *src0 = samples[0];
152 int16_t *src1 = samples[1];
153 int16_t *dst = src0;
154 float m0 = matrix[0][0];
155 float m1 = matrix[0][1];
156
157 while (len > 4) {
158 *dst++ = av_clip_int16(lrintf(*src0++ * m0 + *src1++ * m1));
159 *dst++ = av_clip_int16(lrintf(*src0++ * m0 + *src1++ * m1));
160 *dst++ = av_clip_int16(lrintf(*src0++ * m0 + *src1++ * m1));
161 *dst++ = av_clip_int16(lrintf(*src0++ * m0 + *src1++ * m1));
162 len -= 4;
163 }
164 while (len > 0) {
165 *dst++ = av_clip_int16(lrintf(*src0++ * m0 + *src1++ * m1));
166 len--;
167 }
168 }
169
170 static void mix_2_to_1_s16p_q8_c(int16_t **samples, int16_t **matrix, int len,
171 int out_ch, int in_ch)
172 {
173 int16_t *src0 = samples[0];
174 int16_t *src1 = samples[1];
175 int16_t *dst = src0;
176 int16_t m0 = matrix[0][0];
177 int16_t m1 = matrix[0][1];
178
179 while (len > 4) {
180 *dst++ = (*src0++ * m0 + *src1++ * m1) >> 8;
181 *dst++ = (*src0++ * m0 + *src1++ * m1) >> 8;
182 *dst++ = (*src0++ * m0 + *src1++ * m1) >> 8;
183 *dst++ = (*src0++ * m0 + *src1++ * m1) >> 8;
184 len -= 4;
185 }
186 while (len > 0) {
187 *dst++ = (*src0++ * m0 + *src1++ * m1) >> 8;
188 len--;
189 }
190 }
191
192 static void mix_1_to_2_fltp_flt_c(float **samples, float **matrix, int len,
193 int out_ch, int in_ch)
194 {
195 float v;
196 float *dst0 = samples[0];
197 float *dst1 = samples[1];
198 float *src = dst0;
199 float m0 = matrix[0][0];
200 float m1 = matrix[1][0];
201
202 while (len > 4) {
203 v = *src++;
204 *dst0++ = v * m1;
205 *dst1++ = v * m0;
206 v = *src++;
207 *dst0++ = v * m1;
208 *dst1++ = v * m0;
209 v = *src++;
210 *dst0++ = v * m1;
211 *dst1++ = v * m0;
212 v = *src++;
213 *dst0++ = v * m1;
214 *dst1++ = v * m0;
215 len -= 4;
216 }
217 while (len > 0) {
218 v = *src++;
219 *dst0++ = v * m1;
220 *dst1++ = v * m0;
221 len--;
222 }
223 }
224
225 static void mix_6_to_2_fltp_flt_c(float **samples, float **matrix, int len,
226 int out_ch, int in_ch)
227 {
228 float v0, v1;
229 float *src0 = samples[0];
230 float *src1 = samples[1];
231 float *src2 = samples[2];
232 float *src3 = samples[3];
233 float *src4 = samples[4];
234 float *src5 = samples[5];
235 float *dst0 = src0;
236 float *dst1 = src1;
237 float *m0 = matrix[0];
238 float *m1 = matrix[1];
239
240 while (len > 0) {
241 v0 = *src0++;
242 v1 = *src1++;
243 *dst0++ = v0 * m0[0] +
244 v1 * m0[1] +
245 *src2 * m0[2] +
246 *src3 * m0[3] +
247 *src4 * m0[4] +
248 *src5 * m0[5];
249 *dst1++ = v0 * m1[0] +
250 v1 * m1[1] +
251 *src2++ * m1[2] +
252 *src3++ * m1[3] +
253 *src4++ * m1[4] +
254 *src5++ * m1[5];
255 len--;
256 }
257 }
258
259 static void mix_2_to_6_fltp_flt_c(float **samples, float **matrix, int len,
260 int out_ch, int in_ch)
261 {
262 float v0, v1;
263 float *dst0 = samples[0];
264 float *dst1 = samples[1];
265 float *dst2 = samples[2];
266 float *dst3 = samples[3];
267 float *dst4 = samples[4];
268 float *dst5 = samples[5];
269 float *src0 = dst0;
270 float *src1 = dst1;
271
272 while (len > 0) {
273 v0 = *src0++;
274 v1 = *src1++;
275 *dst0++ = v0 * matrix[0][0] + v1 * matrix[0][1];
276 *dst1++ = v0 * matrix[1][0] + v1 * matrix[1][1];
277 *dst2++ = v0 * matrix[2][0] + v1 * matrix[2][1];
278 *dst3++ = v0 * matrix[3][0] + v1 * matrix[3][1];
279 *dst4++ = v0 * matrix[4][0] + v1 * matrix[4][1];
280 *dst5++ = v0 * matrix[5][0] + v1 * matrix[5][1];
281 len--;
282 }
283 }
284
285 static int mix_function_init(AudioMix *am)
286 {
287 /* no need to set a mix function when we're skipping mixing */
288 if (!am->in_matrix_channels || !am->out_matrix_channels) {
289 am->func_descr = "n/a";
290 return 0;
291 }
292
293 /* any-to-any C versions */
294
295 ff_audio_mix_set_func(am, AV_SAMPLE_FMT_FLTP, AV_MIX_COEFF_TYPE_FLT,
296 0, 0, 1, 1, "C", MIX_FUNC_NAME(FLTP, FLT));
297
298 ff_audio_mix_set_func(am, AV_SAMPLE_FMT_S16P, AV_MIX_COEFF_TYPE_FLT,
299 0, 0, 1, 1, "C", MIX_FUNC_NAME(S16P, FLT));
300
301 ff_audio_mix_set_func(am, AV_SAMPLE_FMT_S16P, AV_MIX_COEFF_TYPE_Q15,
302 0, 0, 1, 1, "C", MIX_FUNC_NAME(S16P, Q15));
303
304 ff_audio_mix_set_func(am, AV_SAMPLE_FMT_S16P, AV_MIX_COEFF_TYPE_Q8,
305 0, 0, 1, 1, "C", MIX_FUNC_NAME(S16P, Q8));
306
307 /* channel-specific C versions */
308
309 ff_audio_mix_set_func(am, AV_SAMPLE_FMT_FLTP, AV_MIX_COEFF_TYPE_FLT,
310 2, 1, 1, 1, "C", mix_2_to_1_fltp_flt_c);
311
312 ff_audio_mix_set_func(am, AV_SAMPLE_FMT_S16P, AV_MIX_COEFF_TYPE_FLT,
313 2, 1, 1, 1, "C", mix_2_to_1_s16p_flt_c);
314
315 ff_audio_mix_set_func(am, AV_SAMPLE_FMT_S16P, AV_MIX_COEFF_TYPE_Q8,
316 2, 1, 1, 1, "C", mix_2_to_1_s16p_q8_c);
317
318 ff_audio_mix_set_func(am, AV_SAMPLE_FMT_FLTP, AV_MIX_COEFF_TYPE_FLT,
319 1, 2, 1, 1, "C", mix_1_to_2_fltp_flt_c);
320
321 ff_audio_mix_set_func(am, AV_SAMPLE_FMT_FLTP, AV_MIX_COEFF_TYPE_FLT,
322 6, 2, 1, 1, "C", mix_6_to_2_fltp_flt_c);
323
324 ff_audio_mix_set_func(am, AV_SAMPLE_FMT_FLTP, AV_MIX_COEFF_TYPE_FLT,
325 2, 6, 1, 1, "C", mix_2_to_6_fltp_flt_c);
326
327 if (ARCH_X86)
328 ff_audio_mix_init_x86(am);
329
330 if (!am->mix) {
331 av_log(am->avr, AV_LOG_ERROR, "audio_mix: NO FUNCTION FOUND: [fmt=%s] "
332 "[c=%s] [%d to %d]\n", av_get_sample_fmt_name(am->fmt),
333 coeff_type_names[am->coeff_type], am->in_channels,
334 am->out_channels);
335 return AVERROR_PATCHWELCOME;
336 }
337 return 0;
338 }
339
340 AudioMix *ff_audio_mix_alloc(AVAudioResampleContext *avr)
341 {
342 AudioMix *am;
343 int ret;
344
345 am = av_mallocz(sizeof(*am));
346 if (!am)
347 return NULL;
348 am->avr = avr;
349
350 if (avr->internal_sample_fmt != AV_SAMPLE_FMT_S16P &&
351 avr->internal_sample_fmt != AV_SAMPLE_FMT_FLTP) {
352 av_log(avr, AV_LOG_ERROR, "Unsupported internal format for "
353 "mixing: %s\n",
354 av_get_sample_fmt_name(avr->internal_sample_fmt));
355 goto error;
356 }
357
358 am->fmt = avr->internal_sample_fmt;
359 am->coeff_type = avr->mix_coeff_type;
360 am->in_layout = avr->in_channel_layout;
361 am->out_layout = avr->out_channel_layout;
362 am->in_channels = avr->in_channels;
363 am->out_channels = avr->out_channels;
364
365 /* build matrix if the user did not already set one */
366 if (avr->mix_matrix) {
367 ret = ff_audio_mix_set_matrix(am, avr->mix_matrix, avr->in_channels);
368 if (ret < 0)
369 goto error;
370 av_freep(&avr->mix_matrix);
371 } else {
372 int i, j;
373 char in_layout_name[128];
374 char out_layout_name[128];
375 double *matrix_dbl = av_mallocz(avr->out_channels * avr->in_channels *
376 sizeof(*matrix_dbl));
377 if (!matrix_dbl)
378 goto error;
379
380 ret = avresample_build_matrix(avr->in_channel_layout,
381 avr->out_channel_layout,
382 avr->center_mix_level,
383 avr->surround_mix_level,
384 avr->lfe_mix_level,
385 avr->normalize_mix_level,
386 matrix_dbl,
387 avr->in_channels,
388 avr->matrix_encoding);
389 if (ret < 0) {
390 av_free(matrix_dbl);
391 goto error;
392 }
393
394 ret = ff_audio_mix_set_matrix(am, matrix_dbl, avr->in_channels);
395 if (ret < 0) {
396 av_log(avr, AV_LOG_ERROR, "error setting mix matrix\n");
397 av_free(matrix_dbl);
398 goto error;
399 }
400
401 av_get_channel_layout_string(in_layout_name, sizeof(in_layout_name),
402 avr->in_channels, avr->in_channel_layout);
403 av_get_channel_layout_string(out_layout_name, sizeof(out_layout_name),
404 avr->out_channels, avr->out_channel_layout);
405 av_log(avr, AV_LOG_DEBUG, "audio_mix: %s to %s\n",
406 in_layout_name, out_layout_name);
407 av_log(avr, AV_LOG_DEBUG, "matrix size: %d x %d\n",
408 am->in_matrix_channels, am->out_matrix_channels);
409 for (i = 0; i < avr->out_channels; i++) {
410 for (j = 0; j < avr->in_channels; j++) {
411 if (am->output_zero[i])
412 av_log(avr, AV_LOG_DEBUG, " (ZERO)");
413 else if (am->input_skip[j] || am->output_skip[i])
414 av_log(avr, AV_LOG_DEBUG, " (SKIP)");
415 else
416 av_log(avr, AV_LOG_DEBUG, " %0.3f ",
417 matrix_dbl[i * avr->in_channels + j]);
418 }
419 av_log(avr, AV_LOG_DEBUG, "\n");
420 }
421
422 av_free(matrix_dbl);
423 }
424
425 ret = mix_function_init(am);
426 if (ret < 0)
427 goto error;
428
429 return am;
430
431 error:
432 av_free(am);
433 return NULL;
434 }
435
436 void ff_audio_mix_free(AudioMix **am_p)
437 {
438 AudioMix *am;
439
440 if (!*am_p)
441 return;
442 am = *am_p;
443
444 if (am->matrix) {
445 av_free(am->matrix[0]);
446 am->matrix = NULL;
447 }
448 memset(am->matrix_q8, 0, sizeof(am->matrix_q8 ));
449 memset(am->matrix_q15, 0, sizeof(am->matrix_q15));
450 memset(am->matrix_flt, 0, sizeof(am->matrix_flt));
451
452 av_freep(am_p);
453 }
454
455 int ff_audio_mix(AudioMix *am, AudioData *src)
456 {
457 int use_generic = 1;
458 int len = src->nb_samples;
459 int i, j;
460
461 /* determine whether to use the optimized function based on pointer and
462 samples alignment in both the input and output */
463 if (am->has_optimized_func) {
464 int aligned_len = FFALIGN(len, am->samples_align);
465 if (!(src->ptr_align % am->ptr_align) &&
466 src->samples_align >= aligned_len) {
467 len = aligned_len;
468 use_generic = 0;
469 }
470 }
471 av_dlog(am->avr, "audio_mix: %d samples - %d to %d channels (%s)\n",
472 src->nb_samples, am->in_channels, am->out_channels,
473 use_generic ? am->func_descr_generic : am->func_descr);
474
475 if (am->in_matrix_channels && am->out_matrix_channels) {
476 uint8_t **data;
477 uint8_t *data0[AVRESAMPLE_MAX_CHANNELS];
478
479 if (am->out_matrix_channels < am->out_channels ||
480 am->in_matrix_channels < am->in_channels) {
481 for (i = 0, j = 0; i < FFMAX(am->in_channels, am->out_channels); i++) {
482 if (am->input_skip[i] || am->output_skip[i] || am->output_zero[i])
483 continue;
484 data0[j++] = src->data[i];
485 }
486 data = data0;
487 } else {
488 data = src->data;
489 }
490
491 if (use_generic)
492 am->mix_generic(data, am->matrix, len, am->out_matrix_channels,
493 am->in_matrix_channels);
494 else
495 am->mix(data, am->matrix, len, am->out_matrix_channels,
496 am->in_matrix_channels);
497 }
498
499 if (am->out_matrix_channels < am->out_channels) {
500 for (i = 0; i < am->out_channels; i++)
501 if (am->output_zero[i])
502 av_samples_set_silence(&src->data[i], 0, len, 1, am->fmt);
503 }
504
505 ff_audio_data_set_channels(src, am->out_channels);
506
507 return 0;
508 }
509
510 int ff_audio_mix_get_matrix(AudioMix *am, double *matrix, int stride)
511 {
512 int i, o, i0, o0;
513
514 if ( am->in_channels <= 0 || am->in_channels > AVRESAMPLE_MAX_CHANNELS ||
515 am->out_channels <= 0 || am->out_channels > AVRESAMPLE_MAX_CHANNELS) {
516 av_log(am->avr, AV_LOG_ERROR, "Invalid channel counts\n");
517 return AVERROR(EINVAL);
518 }
519
520 #define GET_MATRIX_CONVERT(suffix, scale) \
521 if (!am->matrix_ ## suffix[0]) { \
522 av_log(am->avr, AV_LOG_ERROR, "matrix is not set\n"); \
523 return AVERROR(EINVAL); \
524 } \
525 for (o = 0, o0 = 0; o < am->out_channels; o++) { \
526 for (i = 0, i0 = 0; i < am->in_channels; i++) { \
527 if (am->input_skip[i] || am->output_zero[o]) \
528 matrix[o * stride + i] = 0.0; \
529 else \
530 matrix[o * stride + i] = am->matrix_ ## suffix[o0][i0] * \
531 (scale); \
532 if (!am->input_skip[i]) \
533 i0++; \
534 } \
535 if (!am->output_zero[o]) \
536 o0++; \
537 }
538
539 switch (am->coeff_type) {
540 case AV_MIX_COEFF_TYPE_Q8:
541 GET_MATRIX_CONVERT(q8, 1.0 / 256.0);
542 break;
543 case AV_MIX_COEFF_TYPE_Q15:
544 GET_MATRIX_CONVERT(q15, 1.0 / 32768.0);
545 break;
546 case AV_MIX_COEFF_TYPE_FLT:
547 GET_MATRIX_CONVERT(flt, 1.0);
548 break;
549 default:
550 av_log(am->avr, AV_LOG_ERROR, "Invalid mix coeff type\n");
551 return AVERROR(EINVAL);
552 }
553
554 return 0;
555 }
556
557 int ff_audio_mix_set_matrix(AudioMix *am, const double *matrix, int stride)
558 {
559 int i, o, i0, o0;
560
561 if ( am->in_channels <= 0 || am->in_channels > AVRESAMPLE_MAX_CHANNELS ||
562 am->out_channels <= 0 || am->out_channels > AVRESAMPLE_MAX_CHANNELS) {
563 av_log(am->avr, AV_LOG_ERROR, "Invalid channel counts\n");
564 return AVERROR(EINVAL);
565 }
566
567 if (am->matrix) {
568 av_free(am->matrix[0]);
569 am->matrix = NULL;
570 }
571
572 memset(am->output_zero, 0, sizeof(am->output_zero));
573 memset(am->input_skip, 0, sizeof(am->input_skip));
574 memset(am->output_skip, 0, sizeof(am->output_zero));
575 am->in_matrix_channels = am->in_channels;
576 am->out_matrix_channels = am->out_channels;
577
578 /* exclude output channels if they can be zeroed instead of mixed */
579 for (o = 0; o < am->out_channels; o++) {
580 int zero = 1;
581
582 /* check if the output is always silent */
583 for (i = 0; i < am->in_channels; i++) {
584 if (matrix[o * stride + i] != 0.0) {
585 zero = 0;
586 break;
587 }
588 }
589 /* check if the corresponding input channel makes a contribution to
590 any output channel */
591 if (o < am->in_channels) {
592 for (i = 0; i < am->out_channels; i++) {
593 if (matrix[i * stride + o] != 0.0) {
594 zero = 0;
595 break;
596 }
597 }
598 }
599 if (zero) {
600 am->output_zero[o] = 1;
601 am->out_matrix_channels--;
602 }
603 }
604 if (am->out_matrix_channels == 0) {
605 am->in_matrix_channels = 0;
606 return 0;
607 }
608
609 /* skip input channels that contribute fully only to the corresponding
610 output channel */
611 for (i = 0; i < FFMIN(am->in_channels, am->out_channels); i++) {
612 int skip = 1;
613
614 for (o = 0; o < am->out_channels; o++) {
615 if ((o != i && matrix[o * stride + i] != 0.0) ||
616 (o == i && matrix[o * stride + i] != 1.0)) {
617 skip = 0;
618 break;
619 }
620 }
621 if (skip) {
622 am->input_skip[i] = 1;
623 am->in_matrix_channels--;
624 }
625 }
626 /* skip input channels that do not contribute to any output channel */
627 for (; i < am->in_channels; i++) {
628 int contrib = 0;
629
630 for (o = 0; o < am->out_channels; o++) {
631 if (matrix[o * stride + i] != 0.0) {
632 contrib = 1;
633 break;
634 }
635 }
636 if (!contrib) {
637 am->input_skip[i] = 1;
638 am->in_matrix_channels--;
639 }
640 }
641 if (am->in_matrix_channels == 0) {
642 am->out_matrix_channels = 0;
643 return 0;
644 }
645
646 /* skip output channels that only get full contribution from the
647 corresponding input channel */
648 for (o = 0; o < FFMIN(am->in_channels, am->out_channels); o++) {
649 int skip = 1;
650
651 for (i = 0; i < am->in_channels; i++) {
652 if ((o != i && matrix[o * stride + i] != 0.0) ||
653 (o == i && matrix[o * stride + i] != 1.0)) {
654 skip = 0;
655 break;
656 }
657 }
658 if (skip) {
659 am->output_skip[o] = 1;
660 am->out_matrix_channels--;
661 }
662 }
663 if (am->out_matrix_channels == 0) {
664 am->in_matrix_channels = 0;
665 return 0;
666 }
667
668 #define CONVERT_MATRIX(type, expr) \
669 am->matrix_## type[0] = av_mallocz(am->out_matrix_channels * \
670 am->in_matrix_channels * \
671 sizeof(*am->matrix_## type[0])); \
672 if (!am->matrix_## type[0]) \
673 return AVERROR(ENOMEM); \
674 for (o = 0, o0 = 0; o < am->out_channels; o++) { \
675 if (am->output_zero[o] || am->output_skip[o]) \
676 continue; \
677 if (o0 > 0) \
678 am->matrix_## type[o0] = am->matrix_## type[o0 - 1] + \
679 am->in_matrix_channels; \
680 for (i = 0, i0 = 0; i < am->in_channels; i++) { \
681 double v; \
682 if (am->input_skip[i]) \
683 continue; \
684 v = matrix[o * stride + i]; \
685 am->matrix_## type[o0][i0] = expr; \
686 i0++; \
687 } \
688 o0++; \
689 } \
690 am->matrix = (void **)am->matrix_## type;
691
692 switch (am->coeff_type) {
693 case AV_MIX_COEFF_TYPE_Q8:
694 CONVERT_MATRIX(q8, av_clip_int16(lrint(256.0 * v)))
695 break;
696 case AV_MIX_COEFF_TYPE_Q15:
697 CONVERT_MATRIX(q15, av_clipl_int32(llrint(32768.0 * v)))
698 break;
699 case AV_MIX_COEFF_TYPE_FLT:
700 CONVERT_MATRIX(flt, v)
701 break;
702 default:
703 av_log(am->avr, AV_LOG_ERROR, "Invalid mix coeff type\n");
704 return AVERROR(EINVAL);
705 }
706
707 return 0;
708 }