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, type, list, nb) \
308 if (!(*f) && !(*f = av_mallocz(sizeof(**f)))) \
309 return AVERROR(ENOMEM); \
311 fmts = av_realloc_array((*f)->list, (*f)->nb + 1, \
312 sizeof(*(*f)->list)); \
316 return AVERROR(ENOMEM); \
320 (*f)->list[(*f)->nb++] = fmt; \
323 int ff_add_format(AVFilterFormats **avff, int64_t fmt)
325 ADD_FORMAT(avff, fmt, int, formats, nb_formats);
329 int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout)
331 av_assert1(!(*l && (*l)->all_layouts));
332 ADD_FORMAT(l, channel_layout, uint64_t, channel_layouts, nb_channel_layouts);
336 AVFilterFormats *ff_all_formats(enum AVMediaType type)
338 AVFilterFormats *ret = NULL;
340 if (type == AVMEDIA_TYPE_VIDEO) {
341 const AVPixFmtDescriptor *desc = NULL;
342 while ((desc = av_pix_fmt_desc_next(desc))) {
343 ff_add_format(&ret, av_pix_fmt_desc_get_id(desc));
345 } else if (type == AVMEDIA_TYPE_AUDIO) {
346 enum AVSampleFormat fmt = 0;
347 while (av_get_sample_fmt_name(fmt)) {
348 ff_add_format(&ret, fmt);
356 const int64_t avfilter_all_channel_layouts[] = {
357 #include "all_channel_layouts.inc"
361 // AVFilterFormats *avfilter_make_all_channel_layouts(void)
363 // return avfilter_make_format64_list(avfilter_all_channel_layouts);
366 AVFilterFormats *ff_planar_sample_fmts(void)
368 AVFilterFormats *ret = NULL;
371 for (fmt = 0; av_get_bytes_per_sample(fmt)>0; fmt++)
372 if (av_sample_fmt_is_planar(fmt))
373 ff_add_format(&ret, fmt);
378 AVFilterFormats *ff_all_samplerates(void)
380 AVFilterFormats *ret = av_mallocz(sizeof(*ret));
384 AVFilterChannelLayouts *ff_all_channel_layouts(void)
386 AVFilterChannelLayouts *ret = av_mallocz(sizeof(*ret));
389 ret->all_layouts = 1;
393 AVFilterChannelLayouts *ff_all_channel_counts(void)
395 AVFilterChannelLayouts *ret = av_mallocz(sizeof(*ret));
398 ret->all_layouts = ret->all_counts = 1;
402 #define FORMATS_REF(f, ref) \
406 return AVERROR_BUG; \
408 tmp = av_realloc_array(f->refs, sizeof(*f->refs), f->refcount + 1); \
410 return AVERROR(ENOMEM); \
412 f->refs[f->refcount++] = ref; \
416 int ff_channel_layouts_ref(AVFilterChannelLayouts *f, AVFilterChannelLayouts **ref)
421 int ff_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
426 #define FIND_REF_INDEX(ref, idx) \
429 for (i = 0; i < (*ref)->refcount; i ++) \
430 if((*ref)->refs[i] == ref) { \
436 #define FORMATS_UNREF(ref, list) \
443 FIND_REF_INDEX(ref, idx); \
446 memmove((*ref)->refs + idx, (*ref)->refs + idx + 1, \
447 sizeof(*(*ref)->refs) * ((*ref)->refcount - idx - 1)); \
449 if(!--(*ref)->refcount) { \
450 av_free((*ref)->list); \
451 av_free((*ref)->refs); \
457 void ff_formats_unref(AVFilterFormats **ref)
459 FORMATS_UNREF(ref, formats);
462 void ff_channel_layouts_unref(AVFilterChannelLayouts **ref)
464 FORMATS_UNREF(ref, channel_layouts);
467 #define FORMATS_CHANGEREF(oldref, newref) \
471 FIND_REF_INDEX(oldref, idx); \
474 (*oldref)->refs[idx] = newref; \
480 void ff_channel_layouts_changeref(AVFilterChannelLayouts **oldref,
481 AVFilterChannelLayouts **newref)
483 FORMATS_CHANGEREF(oldref, newref);
486 void ff_formats_changeref(AVFilterFormats **oldref, AVFilterFormats **newref)
488 FORMATS_CHANGEREF(oldref, newref);
491 #define SET_COMMON_FORMATS(ctx, fmts, in_fmts, out_fmts, ref, list) \
495 return AVERROR_BUG; \
497 for (i = 0; i < ctx->nb_inputs; i++) { \
498 if (ctx->inputs[i] && !ctx->inputs[i]->out_fmts) { \
499 int ret = ref(fmts, &ctx->inputs[i]->out_fmts); \
505 for (i = 0; i < ctx->nb_outputs; i++) { \
506 if (ctx->outputs[i] && !ctx->outputs[i]->in_fmts) { \
507 int ret = ref(fmts, &ctx->outputs[i]->in_fmts); \
515 av_freep(&fmts->list); \
516 av_freep(&fmts->refs); \
522 int ff_set_common_channel_layouts(AVFilterContext *ctx,
523 AVFilterChannelLayouts *layouts)
525 SET_COMMON_FORMATS(ctx, layouts, in_channel_layouts, out_channel_layouts,
526 ff_channel_layouts_ref, channel_layouts);
529 int ff_set_common_samplerates(AVFilterContext *ctx,
530 AVFilterFormats *samplerates)
532 SET_COMMON_FORMATS(ctx, samplerates, in_samplerates, out_samplerates,
533 ff_formats_ref, formats);
537 * A helper for query_formats() which sets all links to the same list of
538 * formats. If there are no links hooked to this filter, the list of formats is
541 int ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
543 SET_COMMON_FORMATS(ctx, formats, in_formats, out_formats,
544 ff_formats_ref, formats);
547 static int default_query_formats_common(AVFilterContext *ctx,
548 AVFilterChannelLayouts *(layouts)(void))
551 enum AVMediaType type = ctx->inputs && ctx->inputs [0] ? ctx->inputs [0]->type :
552 ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
555 ret = ff_set_common_formats(ctx, ff_all_formats(type));
558 if (type == AVMEDIA_TYPE_AUDIO) {
559 ret = ff_set_common_channel_layouts(ctx, layouts());
562 ret = ff_set_common_samplerates(ctx, ff_all_samplerates());
570 int ff_default_query_formats(AVFilterContext *ctx)
572 return default_query_formats_common(ctx, ff_all_channel_layouts);
575 int ff_query_formats_all(AVFilterContext *ctx)
577 return default_query_formats_common(ctx, ff_all_channel_counts);
580 /* internal functions for parsing audio format arguments */
582 int ff_parse_pixel_format(enum AVPixelFormat *ret, const char *arg, void *log_ctx)
585 int pix_fmt = av_get_pix_fmt(arg);
586 if (pix_fmt == AV_PIX_FMT_NONE) {
587 pix_fmt = strtol(arg, &tail, 0);
588 if (*tail || !av_pix_fmt_desc_get(pix_fmt)) {
589 av_log(log_ctx, AV_LOG_ERROR, "Invalid pixel format '%s'\n", arg);
590 return AVERROR(EINVAL);
597 int ff_parse_sample_format(int *ret, const char *arg, void *log_ctx)
600 int sfmt = av_get_sample_fmt(arg);
601 if (sfmt == AV_SAMPLE_FMT_NONE) {
602 sfmt = strtol(arg, &tail, 0);
603 if (*tail || av_get_bytes_per_sample(sfmt)<=0) {
604 av_log(log_ctx, AV_LOG_ERROR, "Invalid sample format '%s'\n", arg);
605 return AVERROR(EINVAL);
612 int ff_parse_time_base(AVRational *ret, const char *arg, void *log_ctx)
615 if(av_parse_ratio(&r, arg, INT_MAX, 0, log_ctx) < 0 ||r.num<=0 ||r.den<=0) {
616 av_log(log_ctx, AV_LOG_ERROR, "Invalid time base '%s'\n", arg);
617 return AVERROR(EINVAL);
623 int ff_parse_sample_rate(int *ret, const char *arg, void *log_ctx)
626 double srate = av_strtod(arg, &tail);
627 if (*tail || srate < 1 || (int)srate != srate || srate > INT_MAX) {
628 av_log(log_ctx, AV_LOG_ERROR, "Invalid sample rate '%s'\n", arg);
629 return AVERROR(EINVAL);
635 int ff_parse_channel_layout(int64_t *ret, int *nret, const char *arg,
641 chlayout = av_get_channel_layout(arg);
643 chlayout = strtol(arg, &tail, 10);
644 if (!(*tail == '\0' || *tail == 'c' && *(tail + 1) == '\0') || chlayout <= 0 || chlayout > 63) {
645 av_log(log_ctx, AV_LOG_ERROR, "Invalid channel layout '%s'\n", arg);
646 return AVERROR(EINVAL);
656 *nret = av_get_channel_layout_nb_channels(chlayout);
669 const char *teststrings[] ={
689 for (cl = avfilter_all_channel_layouts; *cl != -1; cl++) {
690 av_get_channel_layout_string(buf, sizeof(buf), -1, *cl);
694 for ( i = 0; i<FF_ARRAY_ELEMS(teststrings); i++) {
698 ret = ff_parse_channel_layout(&layout, &count, teststrings[i], NULL);
700 printf ("%d = ff_parse_channel_layout(%016"PRIX64", %2d, %s);\n", ret ? -1 : 0, layout, count, teststrings[i]);