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(ret->refs, \
43 sizeof(*tmp) * (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(sizeof(*ret->fmts) * count))) \
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(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(sizeof(*formats->field)*count); \
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) \
318 if (!(*f) && !(*f = av_mallocz(sizeof(**f)))) \
319 return AVERROR(ENOMEM); \
321 fmts = av_realloc((*f)->list, \
322 sizeof(*(*f)->list) * ((*f)->nb + 1));\
324 return AVERROR(ENOMEM); \
327 (*f)->list[(*f)->nb++] = fmt; \
330 int ff_add_format(AVFilterFormats **avff, int64_t fmt)
332 ADD_FORMAT(avff, fmt, int, formats, nb_formats);
336 int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout)
338 av_assert1(!(*l && (*l)->all_layouts));
339 ADD_FORMAT(l, channel_layout, uint64_t, channel_layouts, nb_channel_layouts);
343 AVFilterFormats *ff_all_formats(enum AVMediaType type)
345 AVFilterFormats *ret = NULL;
347 int num_formats = type == AVMEDIA_TYPE_VIDEO ? AV_PIX_FMT_NB :
348 type == AVMEDIA_TYPE_AUDIO ? AV_SAMPLE_FMT_NB : 0;
350 for (fmt = 0; fmt < num_formats; fmt++) {
351 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
352 if ((type != AVMEDIA_TYPE_VIDEO) ||
353 (type == AVMEDIA_TYPE_VIDEO && !(desc->flags & AV_PIX_FMT_FLAG_HWACCEL)))
354 ff_add_format(&ret, fmt);
360 const int64_t avfilter_all_channel_layouts[] = {
361 #include "all_channel_layouts.inc"
365 // AVFilterFormats *avfilter_make_all_channel_layouts(void)
367 // return avfilter_make_format64_list(avfilter_all_channel_layouts);
370 AVFilterFormats *ff_planar_sample_fmts(void)
372 AVFilterFormats *ret = NULL;
375 for (fmt = 0; fmt < AV_SAMPLE_FMT_NB; fmt++)
376 if (av_sample_fmt_is_planar(fmt))
377 ff_add_format(&ret, fmt);
382 AVFilterFormats *ff_all_samplerates(void)
384 AVFilterFormats *ret = av_mallocz(sizeof(*ret));
388 AVFilterChannelLayouts *ff_all_channel_layouts(void)
390 AVFilterChannelLayouts *ret = av_mallocz(sizeof(*ret));
393 ret->all_layouts = 1;
397 AVFilterChannelLayouts *ff_all_channel_counts(void)
399 AVFilterChannelLayouts *ret = av_mallocz(sizeof(*ret));
402 ret->all_layouts = ret->all_counts = 1;
406 #define FORMATS_REF(f, ref) \
409 f->refs = av_realloc(f->refs, sizeof(*f->refs) * ++f->refcount); \
410 f->refs[f->refcount-1] = ref; \
413 void ff_channel_layouts_ref(AVFilterChannelLayouts *f, AVFilterChannelLayouts **ref)
418 void ff_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
423 #define FIND_REF_INDEX(ref, idx) \
426 for (i = 0; i < (*ref)->refcount; i ++) \
427 if((*ref)->refs[i] == ref) { \
433 #define FORMATS_UNREF(ref, list) \
440 FIND_REF_INDEX(ref, idx); \
443 memmove((*ref)->refs + idx, (*ref)->refs + idx + 1, \
444 sizeof(*(*ref)->refs) * ((*ref)->refcount - idx - 1)); \
446 if(!--(*ref)->refcount) { \
447 av_free((*ref)->list); \
448 av_free((*ref)->refs); \
454 void ff_formats_unref(AVFilterFormats **ref)
456 FORMATS_UNREF(ref, formats);
459 void ff_channel_layouts_unref(AVFilterChannelLayouts **ref)
461 FORMATS_UNREF(ref, channel_layouts);
464 #define FORMATS_CHANGEREF(oldref, newref) \
468 FIND_REF_INDEX(oldref, idx); \
471 (*oldref)->refs[idx] = newref; \
477 void ff_channel_layouts_changeref(AVFilterChannelLayouts **oldref,
478 AVFilterChannelLayouts **newref)
480 FORMATS_CHANGEREF(oldref, newref);
483 void ff_formats_changeref(AVFilterFormats **oldref, AVFilterFormats **newref)
485 FORMATS_CHANGEREF(oldref, newref);
488 #define SET_COMMON_FORMATS(ctx, fmts, in_fmts, out_fmts, ref, list) \
492 for (i = 0; i < ctx->nb_inputs; i++) { \
493 if (ctx->inputs[i] && !ctx->inputs[i]->out_fmts) { \
494 ref(fmts, &ctx->inputs[i]->out_fmts); \
498 for (i = 0; i < ctx->nb_outputs; i++) { \
499 if (ctx->outputs[i] && !ctx->outputs[i]->in_fmts) { \
500 ref(fmts, &ctx->outputs[i]->in_fmts); \
506 av_freep(&fmts->list); \
507 av_freep(&fmts->refs); \
512 void ff_set_common_channel_layouts(AVFilterContext *ctx,
513 AVFilterChannelLayouts *layouts)
515 SET_COMMON_FORMATS(ctx, layouts, in_channel_layouts, out_channel_layouts,
516 ff_channel_layouts_ref, channel_layouts);
519 void ff_set_common_samplerates(AVFilterContext *ctx,
520 AVFilterFormats *samplerates)
522 SET_COMMON_FORMATS(ctx, samplerates, in_samplerates, out_samplerates,
523 ff_formats_ref, formats);
527 * A helper for query_formats() which sets all links to the same list of
528 * formats. If there are no links hooked to this filter, the list of formats is
531 void ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
533 SET_COMMON_FORMATS(ctx, formats, in_formats, out_formats,
534 ff_formats_ref, formats);
537 static int default_query_formats_common(AVFilterContext *ctx,
538 AVFilterChannelLayouts *(layouts)(void))
540 enum AVMediaType type = ctx->inputs && ctx->inputs [0] ? ctx->inputs [0]->type :
541 ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
544 ff_set_common_formats(ctx, ff_all_formats(type));
545 if (type == AVMEDIA_TYPE_AUDIO) {
546 ff_set_common_channel_layouts(ctx, layouts());
547 ff_set_common_samplerates(ctx, ff_all_samplerates());
553 int ff_default_query_formats(AVFilterContext *ctx)
555 return default_query_formats_common(ctx, ff_all_channel_layouts);
558 int ff_query_formats_all(AVFilterContext *ctx)
560 return default_query_formats_common(ctx, ff_all_channel_counts);
563 /* internal functions for parsing audio format arguments */
565 int ff_parse_pixel_format(enum AVPixelFormat *ret, const char *arg, void *log_ctx)
568 int pix_fmt = av_get_pix_fmt(arg);
569 if (pix_fmt == AV_PIX_FMT_NONE) {
570 pix_fmt = strtol(arg, &tail, 0);
571 if (*tail || (unsigned)pix_fmt >= AV_PIX_FMT_NB) {
572 av_log(log_ctx, AV_LOG_ERROR, "Invalid pixel format '%s'\n", arg);
573 return AVERROR(EINVAL);
580 int ff_parse_sample_format(int *ret, const char *arg, void *log_ctx)
583 int sfmt = av_get_sample_fmt(arg);
584 if (sfmt == AV_SAMPLE_FMT_NONE) {
585 sfmt = strtol(arg, &tail, 0);
586 if (*tail || (unsigned)sfmt >= AV_SAMPLE_FMT_NB) {
587 av_log(log_ctx, AV_LOG_ERROR, "Invalid sample format '%s'\n", arg);
588 return AVERROR(EINVAL);
595 int ff_parse_time_base(AVRational *ret, const char *arg, void *log_ctx)
598 if(av_parse_ratio(&r, arg, INT_MAX, 0, log_ctx) < 0 ||r.num<=0 ||r.den<=0) {
599 av_log(log_ctx, AV_LOG_ERROR, "Invalid time base '%s'\n", arg);
600 return AVERROR(EINVAL);
606 int ff_parse_sample_rate(int *ret, const char *arg, void *log_ctx)
609 double srate = av_strtod(arg, &tail);
610 if (*tail || srate < 1 || (int)srate != srate || srate > INT_MAX) {
611 av_log(log_ctx, AV_LOG_ERROR, "Invalid sample rate '%s'\n", arg);
612 return AVERROR(EINVAL);
618 int ff_parse_channel_layout(int64_t *ret, const char *arg, void *log_ctx)
621 int64_t chlayout = av_get_channel_layout(arg);
623 chlayout = strtol(arg, &tail, 10);
624 if (*tail || chlayout == 0) {
625 av_log(log_ctx, AV_LOG_ERROR, "Invalid channel layout '%s'\n", arg);
626 return AVERROR(EINVAL);
642 for (cl = avfilter_all_channel_layouts; *cl != -1; cl++) {
643 av_get_channel_layout_string(buf, sizeof(buf), -1, *cl);