2 * Filter layer - format negotiation
3 * Copyright (c) 2007 Bobby Bingham
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/avassert.h"
23 #include "libavutil/channel_layout.h"
24 #include "libavutil/common.h"
25 #include "libavutil/eval.h"
26 #include "libavutil/pixdesc.h"
27 #include "libavutil/parseutils.h"
32 #define KNOWN(l) (!FF_LAYOUT2COUNT(l)) /* for readability */
35 * Add all refs from a to ret and destroy a.
37 #define MERGE_REF(ret, a, fmts, type, fail) \
42 if (!(tmp = av_realloc_array(ret->refs, ret->refcount + a->refcount, \
47 for (i = 0; i < a->refcount; i ++) { \
48 ret->refs[ret->refcount] = a->refs[i]; \
49 *ret->refs[ret->refcount++] = ret; \
58 * Add all formats common for a and b to ret, copy the refs and destroy
61 #define MERGE_FORMATS(ret, a, b, fmts, nb, type, fail) \
63 int i, j, k = 0, count = FFMIN(a->nb, b->nb); \
65 if (!(ret = av_mallocz(sizeof(*ret)))) \
69 if (!(ret->fmts = av_malloc_array(count, sizeof(*ret->fmts)))) \
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"); \
80 ret->fmts[k++] = a->fmts[i]; \
84 /* check that there was at least one common format */ \
88 MERGE_REF(ret, a, fmts, type, fail); \
89 MERGE_REF(ret, b, fmts, type, fail); \
92 AVFilterFormats *ff_merge_formats(AVFilterFormats *a, AVFilterFormats *b,
93 enum AVMediaType type)
95 AVFilterFormats *ret = NULL;
97 int alpha1=0, alpha2=0;
98 int chroma1=0, chroma2=0;
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;
123 // If chroma or alpha can be lost through merging then do not merge
124 if (alpha2 > alpha1 || chroma2 > chroma1)
127 MERGE_FORMATS(ret, a, b, formats, nb_formats, AVFilterFormats, fail);
132 av_freep(&ret->refs);
133 av_freep(&ret->formats);
139 AVFilterFormats *ff_merge_samplerates(AVFilterFormats *a,
142 AVFilterFormats *ret = NULL;
144 if (a == b) return a;
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);
152 MERGE_REF(b, a, formats, AVFilterFormats, fail);
159 av_freep(&ret->refs);
160 av_freep(&ret->formats);
166 AVFilterChannelLayouts *ff_merge_channel_layouts(AVFilterChannelLayouts *a,
167 AVFilterChannelLayouts *b)
169 AVFilterChannelLayouts *ret = NULL;
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;
174 if (a == b) return a;
176 /* Put the most generic set in a, to avoid doing everything twice */
178 FFSWAP(AVFilterChannelLayouts *, a, b);
179 FFSWAP(unsigned, a_all, b_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
191 b->nb_channel_layouts = j;
193 MERGE_REF(b, a, channel_layouts, AVFilterChannelLayouts, fail);
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))))
203 /* a[known] intersect b[known] */
204 for (i = 0; i < a->nb_channel_layouts; i++) {
205 if (!KNOWN(a->channel_layouts[i]))
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;
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))
221 bfmt = FF_COUNT2LAYOUT(av_get_channel_layout_nb_channels(fmt));
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];
226 /* 1st round: swap to prepare 2nd round; 2nd round: put it back */
227 FFSWAP(AVFilterChannelLayouts *, a, b);
229 /* a[generic] intersect b[generic] */
230 for (i = 0; i < a->nb_channel_layouts; i++) {
231 if (KNOWN(a->channel_layouts[i]))
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];
238 ret->nb_channel_layouts = ret_nb;
239 if (!ret->nb_channel_layouts)
241 MERGE_REF(ret, a, channel_layouts, AVFilterChannelLayouts, fail);
242 MERGE_REF(ret, b, channel_layouts, AVFilterChannelLayouts, fail);
247 av_freep(&ret->refs);
248 av_freep(&ret->channel_layouts);
254 int ff_fmt_is_in(int fmt, const int *fmts)
258 for (p = fmts; *p != -1; p++) {
265 #define MAKE_FORMAT_LIST(type, field, count_field) \
269 for (count = 0; fmts[count] != -1; count++) \
271 formats = av_mallocz(sizeof(*formats)); \
274 formats->count_field = count; \
276 formats->field = av_malloc_array(count, sizeof(*formats->field)); \
277 if (!formats->field) { \
278 av_freep(&formats); \
283 AVFilterFormats *ff_make_format_list(const int *fmts)
285 MAKE_FORMAT_LIST(AVFilterFormats, formats, nb_formats);
287 formats->formats[count] = fmts[count];
292 AVFilterChannelLayouts *avfilter_make_format64_list(const int64_t *fmts)
294 MAKE_FORMAT_LIST(AVFilterChannelLayouts,
295 channel_layouts, nb_channel_layouts);
297 memcpy(formats->channel_layouts, fmts,
298 sizeof(*formats->channel_layouts) * count);
303 #define ADD_FORMAT(f, fmt, unref_fn, type, list, nb) \
308 if (!(*f) && !(*f = av_mallocz(sizeof(**f)))) { \
310 return AVERROR(ENOMEM); \
313 fmts = av_realloc_array((*f)->list, (*f)->nb + 1, \
314 sizeof(*(*f)->list)); \
319 return AVERROR(ENOMEM); \
323 (*f)->list[(*f)->nb++] = fmt; \
326 int ff_add_format(AVFilterFormats **avff, int64_t fmt)
328 ADD_FORMAT(avff, fmt, ff_formats_unref, int, formats, nb_formats);
332 int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout)
334 av_assert1(!(*l && (*l)->all_layouts));
335 ADD_FORMAT(l, channel_layout, ff_channel_layouts_unref, uint64_t, channel_layouts, nb_channel_layouts);
339 AVFilterFormats *ff_all_formats(enum AVMediaType type)
341 AVFilterFormats *ret = NULL;
343 if (type == AVMEDIA_TYPE_VIDEO) {
344 const AVPixFmtDescriptor *desc = NULL;
345 while ((desc = av_pix_fmt_desc_next(desc))) {
346 if (ff_add_format(&ret, av_pix_fmt_desc_get_id(desc)) < 0)
349 } else if (type == AVMEDIA_TYPE_AUDIO) {
350 enum AVSampleFormat fmt = 0;
351 while (av_get_sample_fmt_name(fmt)) {
352 if (ff_add_format(&ret, fmt) < 0)
361 const int64_t avfilter_all_channel_layouts[] = {
362 #include "all_channel_layouts.inc"
366 // AVFilterFormats *avfilter_make_all_channel_layouts(void)
368 // return avfilter_make_format64_list(avfilter_all_channel_layouts);
371 AVFilterFormats *ff_planar_sample_fmts(void)
373 AVFilterFormats *ret = NULL;
376 for (fmt = 0; av_get_bytes_per_sample(fmt)>0; fmt++)
377 if (av_sample_fmt_is_planar(fmt))
378 if (ff_add_format(&ret, fmt) < 0)
384 AVFilterFormats *ff_all_samplerates(void)
386 AVFilterFormats *ret = av_mallocz(sizeof(*ret));
390 AVFilterChannelLayouts *ff_all_channel_layouts(void)
392 AVFilterChannelLayouts *ret = av_mallocz(sizeof(*ret));
395 ret->all_layouts = 1;
399 AVFilterChannelLayouts *ff_all_channel_counts(void)
401 AVFilterChannelLayouts *ret = av_mallocz(sizeof(*ret));
404 ret->all_layouts = ret->all_counts = 1;
408 #define FORMATS_REF(f, ref, unref_fn) \
412 return AVERROR(ENOMEM); \
414 tmp = av_realloc_array(f->refs, sizeof(*f->refs), f->refcount + 1); \
417 return AVERROR(ENOMEM); \
420 f->refs[f->refcount++] = ref; \
424 int ff_channel_layouts_ref(AVFilterChannelLayouts *f, AVFilterChannelLayouts **ref)
426 FORMATS_REF(f, ref, ff_channel_layouts_unref);
429 int ff_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
431 FORMATS_REF(f, ref, ff_formats_unref);
434 #define FIND_REF_INDEX(ref, idx) \
437 for (i = 0; i < (*ref)->refcount; i ++) \
438 if((*ref)->refs[i] == ref) { \
444 #define FORMATS_UNREF(ref, list) \
451 FIND_REF_INDEX(ref, idx); \
454 memmove((*ref)->refs + idx, (*ref)->refs + idx + 1, \
455 sizeof(*(*ref)->refs) * ((*ref)->refcount - idx - 1)); \
457 if(!--(*ref)->refcount) { \
458 av_free((*ref)->list); \
459 av_free((*ref)->refs); \
465 void ff_formats_unref(AVFilterFormats **ref)
467 FORMATS_UNREF(ref, formats);
470 void ff_channel_layouts_unref(AVFilterChannelLayouts **ref)
472 FORMATS_UNREF(ref, channel_layouts);
475 #define FORMATS_CHANGEREF(oldref, newref) \
479 FIND_REF_INDEX(oldref, idx); \
482 (*oldref)->refs[idx] = newref; \
488 void ff_channel_layouts_changeref(AVFilterChannelLayouts **oldref,
489 AVFilterChannelLayouts **newref)
491 FORMATS_CHANGEREF(oldref, newref);
494 void ff_formats_changeref(AVFilterFormats **oldref, AVFilterFormats **newref)
496 FORMATS_CHANGEREF(oldref, newref);
499 #define SET_COMMON_FORMATS(ctx, fmts, in_fmts, out_fmts, ref_fn, unref_fn, list) \
503 return AVERROR(ENOMEM); \
505 for (i = 0; i < ctx->nb_inputs; i++) { \
506 if (ctx->inputs[i] && !ctx->inputs[i]->out_fmts) { \
507 int ret = ref_fn(fmts, &ctx->inputs[i]->out_fmts); \
515 for (i = 0; i < ctx->nb_outputs; i++) { \
516 if (ctx->outputs[i] && !ctx->outputs[i]->in_fmts) { \
517 int ret = ref_fn(fmts, &ctx->outputs[i]->in_fmts); \
527 av_freep(&fmts->list); \
528 av_freep(&fmts->refs); \
534 int ff_set_common_channel_layouts(AVFilterContext *ctx,
535 AVFilterChannelLayouts *layouts)
537 SET_COMMON_FORMATS(ctx, layouts, in_channel_layouts, out_channel_layouts,
538 ff_channel_layouts_ref, ff_channel_layouts_unref, channel_layouts);
541 int ff_set_common_samplerates(AVFilterContext *ctx,
542 AVFilterFormats *samplerates)
544 SET_COMMON_FORMATS(ctx, samplerates, in_samplerates, out_samplerates,
545 ff_formats_ref, ff_formats_unref, formats);
549 * A helper for query_formats() which sets all links to the same list of
550 * formats. If there are no links hooked to this filter, the list of formats is
553 int ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
555 SET_COMMON_FORMATS(ctx, formats, in_formats, out_formats,
556 ff_formats_ref, ff_formats_unref, formats);
559 static int default_query_formats_common(AVFilterContext *ctx,
560 AVFilterChannelLayouts *(layouts)(void))
563 enum AVMediaType type = ctx->inputs && ctx->inputs [0] ? ctx->inputs [0]->type :
564 ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
567 ret = ff_set_common_formats(ctx, ff_all_formats(type));
570 if (type == AVMEDIA_TYPE_AUDIO) {
571 ret = ff_set_common_channel_layouts(ctx, layouts());
574 ret = ff_set_common_samplerates(ctx, ff_all_samplerates());
582 int ff_default_query_formats(AVFilterContext *ctx)
584 return default_query_formats_common(ctx, ff_all_channel_layouts);
587 int ff_query_formats_all(AVFilterContext *ctx)
589 return default_query_formats_common(ctx, ff_all_channel_counts);
592 /* internal functions for parsing audio format arguments */
594 int ff_parse_pixel_format(enum AVPixelFormat *ret, const char *arg, void *log_ctx)
597 int pix_fmt = av_get_pix_fmt(arg);
598 if (pix_fmt == AV_PIX_FMT_NONE) {
599 pix_fmt = strtol(arg, &tail, 0);
600 if (*tail || !av_pix_fmt_desc_get(pix_fmt)) {
601 av_log(log_ctx, AV_LOG_ERROR, "Invalid pixel format '%s'\n", arg);
602 return AVERROR(EINVAL);
609 int ff_parse_sample_format(int *ret, const char *arg, void *log_ctx)
612 int sfmt = av_get_sample_fmt(arg);
613 if (sfmt == AV_SAMPLE_FMT_NONE) {
614 sfmt = strtol(arg, &tail, 0);
615 if (*tail || av_get_bytes_per_sample(sfmt)<=0) {
616 av_log(log_ctx, AV_LOG_ERROR, "Invalid sample format '%s'\n", arg);
617 return AVERROR(EINVAL);
624 int ff_parse_time_base(AVRational *ret, const char *arg, void *log_ctx)
627 if(av_parse_ratio(&r, arg, INT_MAX, 0, log_ctx) < 0 ||r.num<=0 ||r.den<=0) {
628 av_log(log_ctx, AV_LOG_ERROR, "Invalid time base '%s'\n", arg);
629 return AVERROR(EINVAL);
635 int ff_parse_sample_rate(int *ret, const char *arg, void *log_ctx)
638 double srate = av_strtod(arg, &tail);
639 if (*tail || srate < 1 || (int)srate != srate || srate > INT_MAX) {
640 av_log(log_ctx, AV_LOG_ERROR, "Invalid sample rate '%s'\n", arg);
641 return AVERROR(EINVAL);
647 int ff_parse_channel_layout(int64_t *ret, int *nret, const char *arg,
653 chlayout = av_get_channel_layout(arg);
655 chlayout = strtol(arg, &tail, 10);
656 if (!(*tail == '\0' || *tail == 'c' && *(tail + 1) == '\0') || chlayout <= 0 || chlayout > 63) {
657 av_log(log_ctx, AV_LOG_ERROR, "Invalid channel layout '%s'\n", arg);
658 return AVERROR(EINVAL);
668 *nret = av_get_channel_layout_nb_channels(chlayout);
681 const char *teststrings[] ={
701 for (cl = avfilter_all_channel_layouts; *cl != -1; cl++) {
702 av_get_channel_layout_string(buf, sizeof(buf), -1, *cl);
706 for ( i = 0; i<FF_ARRAY_ELEMS(teststrings); i++) {
710 ret = ff_parse_channel_layout(&layout, &count, teststrings[i], NULL);
712 printf ("%d = ff_parse_channel_layout(%016"PRIX64", %2d, %s);\n", ret ? -1 : 0, layout, count, teststrings[i]);