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 COPY_INT_LIST(list_copy, list, type) { \
268 for (count = 0; list[count] != -1; count++) \
270 list_copy = av_calloc(count+1, sizeof(type)); \
272 memcpy(list_copy, list, sizeof(type) * count); \
273 list_copy[count] = -1; \
277 #define MAKE_FORMAT_LIST(type, field, count_field) \
281 for (count = 0; fmts[count] != -1; count++) \
283 formats = av_mallocz(sizeof(*formats)); \
284 if (!formats) return NULL; \
285 formats->count_field = count; \
287 formats->field = av_malloc_array(count, sizeof(*formats->field)); \
288 if (!formats->field) { \
294 AVFilterFormats *ff_make_format_list(const int *fmts)
296 MAKE_FORMAT_LIST(AVFilterFormats, formats, nb_formats);
298 formats->formats[count] = fmts[count];
303 AVFilterChannelLayouts *avfilter_make_format64_list(const int64_t *fmts)
305 MAKE_FORMAT_LIST(AVFilterChannelLayouts,
306 channel_layouts, nb_channel_layouts);
308 memcpy(formats->channel_layouts, fmts,
309 sizeof(*formats->channel_layouts) * count);
314 #define ADD_FORMAT(f, fmt, type, list, nb) \
319 if (!(*f) && !(*f = av_mallocz(sizeof(**f)))) \
320 return AVERROR(ENOMEM); \
322 fmts = av_realloc((*f)->list, \
323 sizeof(*(*f)->list) * ((*f)->nb + 1));\
327 return AVERROR(ENOMEM); \
331 (*f)->list[(*f)->nb++] = fmt; \
334 int ff_add_format(AVFilterFormats **avff, int64_t fmt)
336 ADD_FORMAT(avff, fmt, int, formats, nb_formats);
340 int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout)
342 av_assert1(!(*l && (*l)->all_layouts));
343 ADD_FORMAT(l, channel_layout, uint64_t, channel_layouts, nb_channel_layouts);
347 AVFilterFormats *ff_all_formats(enum AVMediaType type)
349 AVFilterFormats *ret = NULL;
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))
355 ff_add_format(&ret, av_pix_fmt_desc_get_id(desc));
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);
368 const int64_t avfilter_all_channel_layouts[] = {
369 #include "all_channel_layouts.inc"
373 // AVFilterFormats *avfilter_make_all_channel_layouts(void)
375 // return avfilter_make_format64_list(avfilter_all_channel_layouts);
378 AVFilterFormats *ff_planar_sample_fmts(void)
380 AVFilterFormats *ret = NULL;
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);
390 AVFilterFormats *ff_all_samplerates(void)
392 AVFilterFormats *ret = av_mallocz(sizeof(*ret));
396 AVFilterChannelLayouts *ff_all_channel_layouts(void)
398 AVFilterChannelLayouts *ret = av_mallocz(sizeof(*ret));
401 ret->all_layouts = 1;
405 AVFilterChannelLayouts *ff_all_channel_counts(void)
407 AVFilterChannelLayouts *ret = av_mallocz(sizeof(*ret));
410 ret->all_layouts = ret->all_counts = 1;
414 #define FORMATS_REF(f, ref) \
417 f->refs = av_realloc(f->refs, sizeof(*f->refs) * ++f->refcount); \
418 f->refs[f->refcount-1] = ref; \
421 void ff_channel_layouts_ref(AVFilterChannelLayouts *f, AVFilterChannelLayouts **ref)
426 void ff_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
431 #define FIND_REF_INDEX(ref, idx) \
434 for (i = 0; i < (*ref)->refcount; i ++) \
435 if((*ref)->refs[i] == ref) { \
441 #define FORMATS_UNREF(ref, list) \
448 FIND_REF_INDEX(ref, idx); \
451 memmove((*ref)->refs + idx, (*ref)->refs + idx + 1, \
452 sizeof(*(*ref)->refs) * ((*ref)->refcount - idx - 1)); \
454 if(!--(*ref)->refcount) { \
455 av_free((*ref)->list); \
456 av_free((*ref)->refs); \
462 void ff_formats_unref(AVFilterFormats **ref)
464 FORMATS_UNREF(ref, formats);
467 void ff_channel_layouts_unref(AVFilterChannelLayouts **ref)
469 FORMATS_UNREF(ref, channel_layouts);
472 #define FORMATS_CHANGEREF(oldref, newref) \
476 FIND_REF_INDEX(oldref, idx); \
479 (*oldref)->refs[idx] = newref; \
485 void ff_channel_layouts_changeref(AVFilterChannelLayouts **oldref,
486 AVFilterChannelLayouts **newref)
488 FORMATS_CHANGEREF(oldref, newref);
491 void ff_formats_changeref(AVFilterFormats **oldref, AVFilterFormats **newref)
493 FORMATS_CHANGEREF(oldref, newref);
496 #define SET_COMMON_FORMATS(ctx, fmts, in_fmts, out_fmts, ref, list) \
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); \
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); \
514 av_freep(&fmts->list); \
515 av_freep(&fmts->refs); \
520 void ff_set_common_channel_layouts(AVFilterContext *ctx,
521 AVFilterChannelLayouts *layouts)
523 SET_COMMON_FORMATS(ctx, layouts, in_channel_layouts, out_channel_layouts,
524 ff_channel_layouts_ref, channel_layouts);
527 void ff_set_common_samplerates(AVFilterContext *ctx,
528 AVFilterFormats *samplerates)
530 SET_COMMON_FORMATS(ctx, samplerates, in_samplerates, out_samplerates,
531 ff_formats_ref, formats);
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
539 void ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
541 SET_COMMON_FORMATS(ctx, formats, in_formats, out_formats,
542 ff_formats_ref, formats);
545 static int default_query_formats_common(AVFilterContext *ctx,
546 AVFilterChannelLayouts *(layouts)(void))
548 enum AVMediaType type = ctx->inputs && ctx->inputs [0] ? ctx->inputs [0]->type :
549 ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
552 ff_set_common_formats(ctx, ff_all_formats(type));
553 if (type == AVMEDIA_TYPE_AUDIO) {
554 ff_set_common_channel_layouts(ctx, layouts());
555 ff_set_common_samplerates(ctx, ff_all_samplerates());
561 int ff_default_query_formats(AVFilterContext *ctx)
563 return default_query_formats_common(ctx, ff_all_channel_layouts);
566 int ff_query_formats_all(AVFilterContext *ctx)
568 return default_query_formats_common(ctx, ff_all_channel_counts);
571 /* internal functions for parsing audio format arguments */
573 int ff_parse_pixel_format(enum AVPixelFormat *ret, const char *arg, void *log_ctx)
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);
588 int ff_parse_sample_format(int *ret, const char *arg, void *log_ctx)
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);
603 int ff_parse_time_base(AVRational *ret, const char *arg, void *log_ctx)
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);
614 int ff_parse_sample_rate(int *ret, const char *arg, void *log_ctx)
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);
626 int ff_parse_channel_layout(int64_t *ret, int *nret, const char *arg,
630 int64_t chlayout, count;
633 count = strtol(arg, &tail, 10);
634 if (*tail == 'c' && !tail[1] && count > 0 && count < 63) {
640 chlayout = av_get_channel_layout(arg);
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);
650 *nret = av_get_channel_layout_nb_channels(chlayout);
663 for (cl = avfilter_all_channel_layouts; *cl != -1; cl++) {
664 av_get_channel_layout_string(buf, sizeof(buf), -1, *cl);