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formats.c
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1 /*
2  * Filter layer - format negotiation
3  * Copyright (c) 2007 Bobby Bingham
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/avassert.h"
24 #include "libavutil/common.h"
25 #include "libavutil/eval.h"
26 #include "libavutil/pixdesc.h"
27 #include "libavutil/parseutils.h"
28 #include "avfilter.h"
29 #include "internal.h"
30 #include "formats.h"
31 
32 #define KNOWN(l) (!FF_LAYOUT2COUNT(l)) /* for readability */
33 
34 /**
35  * Add all refs from a to ret and destroy a.
36  */
37 #define MERGE_REF(ret, a, fmts, type, fail) \
38 do { \
39  type ***tmp; \
40  int i; \
41  \
42  if (!(tmp = av_realloc_array(ret->refs, ret->refcount + a->refcount, \
43  sizeof(*tmp)))) \
44  goto fail; \
45  ret->refs = tmp; \
46  \
47  for (i = 0; i < a->refcount; i ++) { \
48  ret->refs[ret->refcount] = a->refs[i]; \
49  *ret->refs[ret->refcount++] = ret; \
50  } \
51  \
52  av_freep(&a->refs); \
53  av_freep(&a->fmts); \
54  av_freep(&a); \
55 } while (0)
56 
57 /**
58  * Add all formats common for a and b to ret, copy the refs and destroy
59  * a and b.
60  */
61 #define MERGE_FORMATS(ret, a, b, fmts, nb, type, fail) \
62 do { \
63  int i, j, k = 0, count = FFMIN(a->nb, b->nb); \
64  \
65  if (!(ret = av_mallocz(sizeof(*ret)))) \
66  goto fail; \
67  \
68  if (count) { \
69  if (!(ret->fmts = av_malloc_array(count, sizeof(*ret->fmts)))) \
70  goto fail; \
71  for (i = 0; i < a->nb; i++) \
72  for (j = 0; j < b->nb; j++) \
73  if (a->fmts[i] == b->fmts[j]) { \
74  if(k >= FFMIN(a->nb, b->nb)){ \
75  av_log(NULL, AV_LOG_ERROR, "Duplicate formats in avfilter_merge_formats() detected\n"); \
76  av_free(ret->fmts); \
77  av_free(ret); \
78  return NULL; \
79  } \
80  ret->fmts[k++] = a->fmts[i]; \
81  } \
82  } \
83  ret->nb = k; \
84  /* check that there was at least one common format */ \
85  if (!ret->nb) \
86  goto fail; \
87  \
88  MERGE_REF(ret, a, fmts, type, fail); \
89  MERGE_REF(ret, b, fmts, type, fail); \
90 } while (0)
91 
93  enum AVMediaType type)
94 {
96  int i, j;
97  int alpha1=0, alpha2=0;
98  int chroma1=0, chroma2=0;
99 
100  if (a == b)
101  return a;
102 
103  /* Do not lose chroma or alpha in merging.
104  It happens if both lists have formats with chroma (resp. alpha), but
105  the only formats in common do not have it (e.g. YUV+gray vs.
106  RGB+gray): in that case, the merging would select the gray format,
107  possibly causing a lossy conversion elsewhere in the graph.
108  To avoid that, pretend that there are no common formats to force the
109  insertion of a conversion filter. */
110  if (type == AVMEDIA_TYPE_VIDEO)
111  for (i = 0; i < a->nb_formats; i++)
112  for (j = 0; j < b->nb_formats; j++) {
113  const AVPixFmtDescriptor *adesc = av_pix_fmt_desc_get(a->formats[i]);
114  const AVPixFmtDescriptor *bdesc = av_pix_fmt_desc_get(b->formats[j]);
115  alpha2 |= adesc->flags & bdesc->flags & AV_PIX_FMT_FLAG_ALPHA;
116  chroma2|= adesc->nb_components > 1 && bdesc->nb_components > 1;
117  if (a->formats[i] == b->formats[j]) {
118  alpha1 |= adesc->flags & AV_PIX_FMT_FLAG_ALPHA;
119  chroma1|= adesc->nb_components > 1;
120  }
121  }
122 
123  // If chroma or alpha can be lost through merging then do not merge
124  if (alpha2 > alpha1 || chroma2 > chroma1)
125  return NULL;
126 
127  MERGE_FORMATS(ret, a, b, formats, nb_formats, AVFilterFormats, fail);
128 
129  return ret;
130 fail:
131  if (ret) {
132  av_freep(&ret->refs);
133  av_freep(&ret->formats);
134  }
135  av_freep(&ret);
136  return NULL;
137 }
138 
141 {
143 
144  if (a == b) return a;
145 
146  if (a->nb_formats && b->nb_formats) {
147  MERGE_FORMATS(ret, a, b, formats, nb_formats, AVFilterFormats, fail);
148  } else if (a->nb_formats) {
149  MERGE_REF(a, b, formats, AVFilterFormats, fail);
150  ret = a;
151  } else {
152  MERGE_REF(b, a, formats, AVFilterFormats, fail);
153  ret = b;
154  }
155 
156  return ret;
157 fail:
158  if (ret) {
159  av_freep(&ret->refs);
160  av_freep(&ret->formats);
161  }
162  av_freep(&ret);
163  return NULL;
164 }
165 
168 {
170  unsigned a_all = a->all_layouts + a->all_counts;
171  unsigned b_all = b->all_layouts + b->all_counts;
172  int ret_max, ret_nb = 0, i, j, round;
173 
174  if (a == b) return a;
175 
176  /* Put the most generic set in a, to avoid doing everything twice */
177  if (a_all < b_all) {
179  FFSWAP(unsigned, a_all, b_all);
180  }
181  if (a_all) {
182  if (a_all == 1 && !b_all) {
183  /* keep only known layouts in b; works also for b_all = 1 */
184  for (i = j = 0; i < b->nb_channel_layouts; i++)
185  if (KNOWN(b->channel_layouts[i]))
186  b->channel_layouts[j++] = b->channel_layouts[i];
187  /* Not optimal: the unknown layouts of b may become known after
188  another merge. */
189  if (!j)
190  return NULL;
191  b->nb_channel_layouts = j;
192  }
193  MERGE_REF(b, a, channel_layouts, AVFilterChannelLayouts, fail);
194  return b;
195  }
196 
197  ret_max = a->nb_channel_layouts + b->nb_channel_layouts;
198  if (!(ret = av_mallocz(sizeof(*ret))) ||
199  !(ret->channel_layouts = av_malloc_array(ret_max,
200  sizeof(*ret->channel_layouts))))
201  goto fail;
202 
203  /* a[known] intersect b[known] */
204  for (i = 0; i < a->nb_channel_layouts; i++) {
205  if (!KNOWN(a->channel_layouts[i]))
206  continue;
207  for (j = 0; j < b->nb_channel_layouts; j++) {
208  if (a->channel_layouts[i] == b->channel_layouts[j]) {
209  ret->channel_layouts[ret_nb++] = a->channel_layouts[i];
210  a->channel_layouts[i] = b->channel_layouts[j] = 0;
211  }
212  }
213  }
214  /* 1st round: a[known] intersect b[generic]
215  2nd round: a[generic] intersect b[known] */
216  for (round = 0; round < 2; round++) {
217  for (i = 0; i < a->nb_channel_layouts; i++) {
218  uint64_t fmt = a->channel_layouts[i], bfmt;
219  if (!fmt || !KNOWN(fmt))
220  continue;
222  for (j = 0; j < b->nb_channel_layouts; j++)
223  if (b->channel_layouts[j] == bfmt)
224  ret->channel_layouts[ret_nb++] = a->channel_layouts[i];
225  }
226  /* 1st round: swap to prepare 2nd round; 2nd round: put it back */
228  }
229  /* a[generic] intersect b[generic] */
230  for (i = 0; i < a->nb_channel_layouts; i++) {
231  if (KNOWN(a->channel_layouts[i]))
232  continue;
233  for (j = 0; j < b->nb_channel_layouts; j++)
234  if (a->channel_layouts[i] == b->channel_layouts[j])
235  ret->channel_layouts[ret_nb++] = a->channel_layouts[i];
236  }
237 
238  ret->nb_channel_layouts = ret_nb;
239  if (!ret->nb_channel_layouts)
240  goto fail;
241  MERGE_REF(ret, a, channel_layouts, AVFilterChannelLayouts, fail);
242  MERGE_REF(ret, b, channel_layouts, AVFilterChannelLayouts, fail);
243  return ret;
244 
245 fail:
246  if (ret) {
247  av_freep(&ret->refs);
248  av_freep(&ret->channel_layouts);
249  }
250  av_freep(&ret);
251  return NULL;
252 }
253 
254 int ff_fmt_is_in(int fmt, const int *fmts)
255 {
256  const int *p;
257 
258  for (p = fmts; *p != -1; p++) {
259  if (fmt == *p)
260  return 1;
261  }
262  return 0;
263 }
264 
265 #define COPY_INT_LIST(list_copy, list, type) { \
266  int count = 0; \
267  if (list) \
268  for (count = 0; list[count] != -1; count++) \
269  ; \
270  list_copy = av_calloc(count+1, sizeof(type)); \
271  if (list_copy) { \
272  memcpy(list_copy, list, sizeof(type) * count); \
273  list_copy[count] = -1; \
274  } \
275 }
276 
277 #define MAKE_FORMAT_LIST(type, field, count_field) \
278  type *formats; \
279  int count = 0; \
280  if (fmts) \
281  for (count = 0; fmts[count] != -1; count++) \
282  ; \
283  formats = av_mallocz(sizeof(*formats)); \
284  if (!formats) return NULL; \
285  formats->count_field = count; \
286  if (count) { \
287  formats->field = av_malloc_array(count, sizeof(*formats->field)); \
288  if (!formats->field) { \
289  av_free(formats); \
290  return NULL; \
291  } \
292  }
293 
295 {
297  while (count--)
298  formats->formats[count] = fmts[count];
299 
300  return formats;
301 }
302 
304 {
306  channel_layouts, nb_channel_layouts);
307  if (count)
308  memcpy(formats->channel_layouts, fmts,
309  sizeof(*formats->channel_layouts) * count);
310 
311  return formats;
312 }
313 
314 #define ADD_FORMAT(f, fmt, type, list, nb) \
315 do { \
316  type *fmts; \
317  void *oldf = *f; \
318  \
319  if (!(*f) && !(*f = av_mallocz(sizeof(**f)))) \
320  return AVERROR(ENOMEM); \
321  \
322  fmts = av_realloc((*f)->list, \
323  sizeof(*(*f)->list) * ((*f)->nb + 1));\
324  if (!fmts) { \
325  if (!oldf) \
326  av_freep(f); \
327  return AVERROR(ENOMEM); \
328  } \
329  \
330  (*f)->list = fmts; \
331  (*f)->list[(*f)->nb++] = fmt; \
332 } while (0)
333 
334 int ff_add_format(AVFilterFormats **avff, int64_t fmt)
335 {
336  ADD_FORMAT(avff, fmt, int, formats, nb_formats);
337  return 0;
338 }
339 
340 int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout)
341 {
342  av_assert1(!(*l && (*l)->all_layouts));
343  ADD_FORMAT(l, channel_layout, uint64_t, channel_layouts, nb_channel_layouts);
344  return 0;
345 }
346 
348 {
350 
351  if (type == AVMEDIA_TYPE_VIDEO) {
352  const AVPixFmtDescriptor *desc = NULL;
353  while ((desc = av_pix_fmt_desc_next(desc))) {
354  if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
356  }
357  } else if (type == AVMEDIA_TYPE_AUDIO) {
358  enum AVSampleFormat fmt = 0;
359  while (av_get_sample_fmt_name(fmt)) {
360  ff_add_format(&ret, fmt);
361  fmt++;
362  }
363  }
364 
365  return ret;
366 }
367 
368 const int64_t avfilter_all_channel_layouts[] = {
369 #include "all_channel_layouts.inc"
370  -1
371 };
372 
373 // AVFilterFormats *avfilter_make_all_channel_layouts(void)
374 // {
375 // return avfilter_make_format64_list(avfilter_all_channel_layouts);
376 // }
377 
379 {
381  int fmt;
382 
383  for (fmt = 0; av_get_bytes_per_sample(fmt)>0; fmt++)
384  if (av_sample_fmt_is_planar(fmt))
385  ff_add_format(&ret, fmt);
386 
387  return ret;
388 }
389 
391 {
392  AVFilterFormats *ret = av_mallocz(sizeof(*ret));
393  return ret;
394 }
395 
397 {
398  AVFilterChannelLayouts *ret = av_mallocz(sizeof(*ret));
399  if (!ret)
400  return NULL;
401  ret->all_layouts = 1;
402  return ret;
403 }
404 
406 {
407  AVFilterChannelLayouts *ret = av_mallocz(sizeof(*ret));
408  if (!ret)
409  return NULL;
410  ret->all_layouts = ret->all_counts = 1;
411  return ret;
412 }
413 
414 #define FORMATS_REF(f, ref) \
415 do { \
416  *ref = f; \
417  f->refs = av_realloc(f->refs, sizeof(*f->refs) * ++f->refcount); \
418  f->refs[f->refcount-1] = ref; \
419 } while (0)
420 
422 {
423  FORMATS_REF(f, ref);
424 }
425 
427 {
428  FORMATS_REF(f, ref);
429 }
430 
431 #define FIND_REF_INDEX(ref, idx) \
432 do { \
433  int i; \
434  for (i = 0; i < (*ref)->refcount; i ++) \
435  if((*ref)->refs[i] == ref) { \
436  idx = i; \
437  break; \
438  } \
439 } while (0)
440 
441 #define FORMATS_UNREF(ref, list) \
442 do { \
443  int idx = -1; \
444  \
445  if (!*ref) \
446  return; \
447  \
448  FIND_REF_INDEX(ref, idx); \
449  \
450  if (idx >= 0) \
451  memmove((*ref)->refs + idx, (*ref)->refs + idx + 1, \
452  sizeof(*(*ref)->refs) * ((*ref)->refcount - idx - 1)); \
453  \
454  if(!--(*ref)->refcount) { \
455  av_free((*ref)->list); \
456  av_free((*ref)->refs); \
457  av_free(*ref); \
458  } \
459  *ref = NULL; \
460 } while (0)
461 
463 {
464  FORMATS_UNREF(ref, formats);
465 }
466 
468 {
469  FORMATS_UNREF(ref, channel_layouts);
470 }
471 
472 #define FORMATS_CHANGEREF(oldref, newref) \
473 do { \
474  int idx = -1; \
475  \
476  FIND_REF_INDEX(oldref, idx); \
477  \
478  if (idx >= 0) { \
479  (*oldref)->refs[idx] = newref; \
480  *newref = *oldref; \
481  *oldref = NULL; \
482  } \
483 } while (0)
484 
486  AVFilterChannelLayouts **newref)
487 {
488  FORMATS_CHANGEREF(oldref, newref);
489 }
490 
492 {
493  FORMATS_CHANGEREF(oldref, newref);
494 }
495 
496 #define SET_COMMON_FORMATS(ctx, fmts, in_fmts, out_fmts, ref, list) \
497 if (fmts) { \
498  int count = 0, i; \
499  \
500  for (i = 0; i < ctx->nb_inputs; i++) { \
501  if (ctx->inputs[i] && !ctx->inputs[i]->out_fmts) { \
502  ref(fmts, &ctx->inputs[i]->out_fmts); \
503  count++; \
504  } \
505  } \
506  for (i = 0; i < ctx->nb_outputs; i++) { \
507  if (ctx->outputs[i] && !ctx->outputs[i]->in_fmts) { \
508  ref(fmts, &ctx->outputs[i]->in_fmts); \
509  count++; \
510  } \
511  } \
512  \
513  if (!count) { \
514  av_freep(&fmts->list); \
515  av_freep(&fmts->refs); \
516  av_freep(&fmts); \
517  } \
518 }
519 
522 {
523  SET_COMMON_FORMATS(ctx, layouts, in_channel_layouts, out_channel_layouts,
524  ff_channel_layouts_ref, channel_layouts);
525 }
526 
528  AVFilterFormats *samplerates)
529 {
530  SET_COMMON_FORMATS(ctx, samplerates, in_samplerates, out_samplerates,
532 }
533 
534 /**
535  * A helper for query_formats() which sets all links to the same list of
536  * formats. If there are no links hooked to this filter, the list of formats is
537  * freed.
538  */
540 {
541  SET_COMMON_FORMATS(ctx, formats, in_formats, out_formats,
542  ff_formats_ref, formats);
543 }
544 
547 {
548  enum AVMediaType type = ctx->inputs && ctx->inputs [0] ? ctx->inputs [0]->type :
549  ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
551 
553  if (type == AVMEDIA_TYPE_AUDIO) {
556  }
557 
558  return 0;
559 }
560 
562 {
564 }
565 
567 {
569 }
570 
571 /* internal functions for parsing audio format arguments */
572 
573 int ff_parse_pixel_format(enum AVPixelFormat *ret, const char *arg, void *log_ctx)
574 {
575  char *tail;
576  int pix_fmt = av_get_pix_fmt(arg);
577  if (pix_fmt == AV_PIX_FMT_NONE) {
578  pix_fmt = strtol(arg, &tail, 0);
579  if (*tail || !av_pix_fmt_desc_get(pix_fmt)) {
580  av_log(log_ctx, AV_LOG_ERROR, "Invalid pixel format '%s'\n", arg);
581  return AVERROR(EINVAL);
582  }
583  }
584  *ret = pix_fmt;
585  return 0;
586 }
587 
588 int ff_parse_sample_format(int *ret, const char *arg, void *log_ctx)
589 {
590  char *tail;
591  int sfmt = av_get_sample_fmt(arg);
592  if (sfmt == AV_SAMPLE_FMT_NONE) {
593  sfmt = strtol(arg, &tail, 0);
594  if (*tail || av_get_bytes_per_sample(sfmt)<=0) {
595  av_log(log_ctx, AV_LOG_ERROR, "Invalid sample format '%s'\n", arg);
596  return AVERROR(EINVAL);
597  }
598  }
599  *ret = sfmt;
600  return 0;
601 }
602 
603 int ff_parse_time_base(AVRational *ret, const char *arg, void *log_ctx)
604 {
605  AVRational r;
606  if(av_parse_ratio(&r, arg, INT_MAX, 0, log_ctx) < 0 ||r.num<=0 ||r.den<=0) {
607  av_log(log_ctx, AV_LOG_ERROR, "Invalid time base '%s'\n", arg);
608  return AVERROR(EINVAL);
609  }
610  *ret = r;
611  return 0;
612 }
613 
614 int ff_parse_sample_rate(int *ret, const char *arg, void *log_ctx)
615 {
616  char *tail;
617  double srate = av_strtod(arg, &tail);
618  if (*tail || srate < 1 || (int)srate != srate || srate > INT_MAX) {
619  av_log(log_ctx, AV_LOG_ERROR, "Invalid sample rate '%s'\n", arg);
620  return AVERROR(EINVAL);
621  }
622  *ret = srate;
623  return 0;
624 }
625 
626 int ff_parse_channel_layout(int64_t *ret, int *nret, const char *arg,
627  void *log_ctx)
628 {
629  char *tail;
630  int64_t chlayout, count;
631 
632  if (nret) {
633  count = strtol(arg, &tail, 10);
634  if (*tail == 'c' && !tail[1] && count > 0 && count < 63) {
635  *nret = count;
636  *ret = 0;
637  return 0;
638  }
639  }
640  chlayout = av_get_channel_layout(arg);
641  if (chlayout == 0) {
642  chlayout = strtol(arg, &tail, 10);
643  if (*tail || chlayout == 0) {
644  av_log(log_ctx, AV_LOG_ERROR, "Invalid channel layout '%s'\n", arg);
645  return AVERROR(EINVAL);
646  }
647  }
648  *ret = chlayout;
649  if (nret)
650  *nret = av_get_channel_layout_nb_channels(chlayout);
651  return 0;
652 }
653 
654 #ifdef TEST
655 
656 #undef printf
657 
658 int main(void)
659 {
660  const int64_t *cl;
661  char buf[512];
662 
663  for (cl = avfilter_all_channel_layouts; *cl != -1; cl++) {
664  av_get_channel_layout_string(buf, sizeof(buf), -1, *cl);
665  printf("%s\n", buf);
666  }
667 
668  return 0;
669 }
670 
671 #endif
672