FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/bsf.c
Date: 2026-01-23 19:11:46
Exec Total Coverage
Lines: 195 274 71.2%
Functions: 21 27 77.8%
Branches: 95 156 60.9%
Line Branch Exec Source
1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #include <string.h>
20
21 #include "config_components.h"
22
23 #include "libavutil/avassert.h"
24 #include "libavutil/log.h"
25 #include "libavutil/mem.h"
26 #include "libavutil/opt.h"
27 #include "libavutil/avstring.h"
28 #include "libavutil/bprint.h"
29
30 #include "bsf.h"
31 #include "bsf_internal.h"
32 #include "codec_desc.h"
33 #include "codec_par.h"
34 #include "packet_internal.h"
35
36 1222288 static av_always_inline const FFBitStreamFilter *ff_bsf(const AVBitStreamFilter *bsf)
37 {
38 1222288 return (const FFBitStreamFilter*)bsf;
39 }
40
41 typedef struct FFBSFContext {
42 AVBSFContext pub;
43 AVPacket *buffer_pkt;
44 int eof;
45 } FFBSFContext;
46
47 1599804 static av_always_inline FFBSFContext *ffbsfcontext(AVBSFContext *ctx)
48 {
49 1599804 return (FFBSFContext *)ctx;
50 }
51
52 99344 void av_bsf_free(AVBSFContext **pctx)
53 {
54 AVBSFContext *ctx;
55 FFBSFContext *bsfi;
56
57
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 99344 if (!pctx || !*pctx)
58 82451 return;
59 16893 ctx = *pctx;
60 16893 bsfi = ffbsfcontext(ctx);
61
62
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 16893 if (ctx->priv_data) {
63
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 1478 if (ff_bsf(ctx->filter)->close)
64 1459 ff_bsf(ctx->filter)->close(ctx);
65
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 1478 if (ctx->filter->priv_class)
66 950 av_opt_free(ctx->priv_data);
67 1478 av_freep(&ctx->priv_data);
68 }
69 16893 av_packet_free(&bsfi->buffer_pkt);
70
71 16893 avcodec_parameters_free(&ctx->par_in);
72 16893 avcodec_parameters_free(&ctx->par_out);
73
74 16893 av_freep(pctx);
75 }
76
77 ✗ static void *bsf_child_next(void *obj, void *prev)
78 {
79 ✗ AVBSFContext *ctx = obj;
80 ✗ if (!prev && ctx->filter->priv_class)
81 ✗ return ctx->priv_data;
82 ✗ return NULL;
83 }
84
85 7 static const char *bsf_to_name(void *bsf)
86 {
87 7 return ((AVBSFContext *)bsf)->filter->name;
88 }
89
90 static const AVClass bsf_class = {
91 .class_name = "AVBSFContext",
92 .item_name = bsf_to_name,
93 .version = LIBAVUTIL_VERSION_INT,
94 .child_next = bsf_child_next,
95 .child_class_iterate = ff_bsf_child_class_iterate,
96 .category = AV_CLASS_CATEGORY_BITSTREAM_FILTER,
97 };
98
99 ✗ const AVClass *av_bsf_get_class(void)
100 {
101 ✗ return &bsf_class;
102 }
103
104 16893 int av_bsf_alloc(const AVBitStreamFilter *filter, AVBSFContext **pctx)
105 {
106 AVBSFContext *ctx;
107 FFBSFContext *bsfi;
108 int ret;
109
110 16893 bsfi = av_mallocz(sizeof(*bsfi));
111
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 16893 if (!bsfi)
112 ✗ return AVERROR(ENOMEM);
113 16893 ctx = &bsfi->pub;
114
115 16893 ctx->av_class = &bsf_class;
116 16893 ctx->filter = filter;
117
118 16893 ctx->par_in = avcodec_parameters_alloc();
119 16893 ctx->par_out = avcodec_parameters_alloc();
120
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 16893 if (!ctx->par_in || !ctx->par_out) {
121 ✗ ret = AVERROR(ENOMEM);
122 ✗ goto fail;
123 }
124 /* allocate priv data and init private options */
125
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 16893 if (ff_bsf(filter)->priv_data_size) {
126 1478 ctx->priv_data = av_mallocz(ff_bsf(filter)->priv_data_size);
127
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 1478 if (!ctx->priv_data) {
128 ✗ ret = AVERROR(ENOMEM);
129 ✗ goto fail;
130 }
131
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 1478 if (filter->priv_class) {
132 950 *(const AVClass **)ctx->priv_data = filter->priv_class;
133 950 av_opt_set_defaults(ctx->priv_data);
134 }
135 }
136 16893 bsfi->buffer_pkt = av_packet_alloc();
137
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 16893 if (!bsfi->buffer_pkt) {
138 ✗ ret = AVERROR(ENOMEM);
139 ✗ goto fail;
140 }
141
142 16893 *pctx = ctx;
143 16893 return 0;
144 ✗ fail:
145 ✗ av_bsf_free(&ctx);
146 ✗ return ret;
147 }
148
149 16893 int av_bsf_init(AVBSFContext *ctx)
150 {
151 int ret, i;
152
153 /* check that the codec is supported */
154
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 16893 if (ctx->filter->codec_ids) {
155
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 6207 for (i = 0; ctx->filter->codec_ids[i] != AV_CODEC_ID_NONE; i++)
156
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 6207 if (ctx->par_in->codec_id == ctx->filter->codec_ids[i])
157 1470 break;
158
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 1470 if (ctx->filter->codec_ids[i] == AV_CODEC_ID_NONE) {
159 ✗ const AVCodecDescriptor *desc = avcodec_descriptor_get(ctx->par_in->codec_id);
160 ✗ av_log(ctx, AV_LOG_ERROR, "Codec '%s' (%d) is not supported by the "
161 "bitstream filter '%s'. Supported codecs are: ",
162 ✗ desc ? desc->name : "unknown", ctx->par_in->codec_id, ctx->filter->name);
163 ✗ for (i = 0; ctx->filter->codec_ids[i] != AV_CODEC_ID_NONE; i++) {
164 ✗ enum AVCodecID codec_id = ctx->filter->codec_ids[i];
165 ✗ av_log(ctx, AV_LOG_ERROR, "%s (%d) ",
166 avcodec_get_name(codec_id), codec_id);
167 }
168 ✗ av_log(ctx, AV_LOG_ERROR, "\n");
169 ✗ return AVERROR(EINVAL);
170 }
171 }
172
173 /* initialize output parameters to be the same as input
174 * init below might overwrite that */
175 16893 ret = avcodec_parameters_copy(ctx->par_out, ctx->par_in);
176
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 16893 if (ret < 0)
177 ✗ return ret;
178
179 16893 ctx->time_base_out = ctx->time_base_in;
180
181
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 16893 if (ff_bsf(ctx->filter)->init) {
182 1473 ret = ff_bsf(ctx->filter)->init(ctx);
183
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 1473 if (ret < 0)
184 ✗ return ret;
185 }
186
187 16893 return 0;
188 }
189
190 114 void av_bsf_flush(AVBSFContext *ctx)
191 {
192 114 FFBSFContext *const bsfi = ffbsfcontext(ctx);
193
194 114 bsfi->eof = 0;
195
196 114 av_packet_unref(bsfi->buffer_pkt);
197
198
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 114 if (ff_bsf(ctx->filter)->flush)
199 ✗ ff_bsf(ctx->filter)->flush(ctx);
200 114 }
201
202 400436 int av_bsf_send_packet(AVBSFContext *ctx, AVPacket *pkt)
203 {
204 400436 FFBSFContext *const bsfi = ffbsfcontext(ctx);
205 int ret;
206
207
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 400436 if (!pkt || AVPACKET_IS_EMPTY(pkt)) {
208
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 3686 if (pkt)
209 3531 av_packet_unref(pkt);
210 3686 bsfi->eof = 1;
211 3686 return 0;
212 }
213
214
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 396750 if (bsfi->eof) {
215 ✗ av_log(ctx, AV_LOG_ERROR, "A non-NULL packet sent after an EOF.\n");
216 ✗ return AVERROR(EINVAL);
217 }
218
219
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 396750 if (!AVPACKET_IS_EMPTY(bsfi->buffer_pkt))
220 ✗ return AVERROR(EAGAIN);
221
222 396750 ret = av_packet_make_refcounted(pkt);
223
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 396750 if (ret < 0)
224 ✗ return ret;
225 396750 av_packet_move_ref(bsfi->buffer_pkt, pkt);
226
227 396750 return 0;
228 }
229
230 1182500 int av_bsf_receive_packet(AVBSFContext *ctx, AVPacket *pkt)
231 {
232 1182500 return ff_bsf(ctx->filter)->filter(ctx, pkt);
233 }
234
235 2213 int ff_bsf_get_packet(AVBSFContext *ctx, AVPacket **pkt)
236 {
237 2213 FFBSFContext *const bsfi = ffbsfcontext(ctx);
238 AVPacket *tmp_pkt;
239
240
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 2213 if (bsfi->eof)
241 19 return AVERROR_EOF;
242
243
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 2194 if (AVPACKET_IS_EMPTY(bsfi->buffer_pkt))
244 1098 return AVERROR(EAGAIN);
245
246 1096 tmp_pkt = av_packet_alloc();
247
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 1096 if (!tmp_pkt)
248 ✗ return AVERROR(ENOMEM);
249
250 1096 *pkt = bsfi->buffer_pkt;
251 1096 bsfi->buffer_pkt = tmp_pkt;
252
253 1096 return 0;
254 }
255
256 1180148 int ff_bsf_get_packet_ref(AVBSFContext *ctx, AVPacket *pkt)
257 {
258 1180148 FFBSFContext *const bsfi = ffbsfcontext(ctx);
259
260
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 1180148 if (bsfi->eof)
261 3683 return AVERROR_EOF;
262
263
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 1176465 if (AVPACKET_IS_EMPTY(bsfi->buffer_pkt))
264 780811 return AVERROR(EAGAIN);
265
266 395654 av_packet_move_ref(pkt, bsfi->buffer_pkt);
267
268 395654 return 0;
269 }
270
271 typedef struct BSFListContext {
272 const AVClass *class;
273
274 AVBSFContext **bsfs;
275 int nb_bsfs;
276
277 unsigned idx; // index of currently processed BSF
278
279 char * item_name;
280 } BSFListContext;
281
282
283 4 static int bsf_list_init(AVBSFContext *bsf)
284 {
285 4 BSFListContext *lst = bsf->priv_data;
286 int ret, i;
287 4 const AVCodecParameters *cod_par = bsf->par_in;
288 4 AVRational tb = bsf->time_base_in;
289
290
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 12 for (i = 0; i < lst->nb_bsfs; ++i) {
291 8 ret = avcodec_parameters_copy(lst->bsfs[i]->par_in, cod_par);
292
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 8 if (ret < 0)
293 ✗ goto fail;
294
295 8 lst->bsfs[i]->time_base_in = tb;
296
297 8 ret = av_bsf_init(lst->bsfs[i]);
298
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 8 if (ret < 0)
299 ✗ goto fail;
300
301 8 cod_par = lst->bsfs[i]->par_out;
302 8 tb = lst->bsfs[i]->time_base_out;
303 }
304
305 4 bsf->time_base_out = tb;
306 4 ret = avcodec_parameters_copy(bsf->par_out, cod_par);
307
308 4 fail:
309 4 return ret;
310 }
311
312 76 static int bsf_list_filter(AVBSFContext *bsf, AVPacket *out)
313 {
314 76 BSFListContext *lst = bsf->priv_data;
315 76 int ret, eof = 0;
316
317
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 76 if (!lst->nb_bsfs)
318 ✗ return ff_bsf_get_packet_ref(bsf, out);
319
320 while (1) {
321 /* get a packet from the previous filter up the chain */
322
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 230 if (lst->idx)
323 146 ret = av_bsf_receive_packet(lst->bsfs[lst->idx-1], out);
324 else
325 84 ret = ff_bsf_get_packet_ref(bsf, out);
326
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 230 if (ret == AVERROR(EAGAIN)) {
327
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 113 if (!lst->idx)
328 40 return ret;
329 73 lst->idx--;
330 73 continue;
331
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 117 } else if (ret == AVERROR_EOF) {
332 12 eof = 1;
333
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 105 } else if (ret < 0)
334 ✗ return ret;
335
336 /* send it to the next filter down the chain */
337
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 117 if (lst->idx < lst->nb_bsfs) {
338
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 81 ret = av_bsf_send_packet(lst->bsfs[lst->idx], eof ? NULL : out);
339 av_assert1(ret != AVERROR(EAGAIN));
340
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 81 if (ret < 0) {
341 ✗ av_packet_unref(out);
342 ✗ return ret;
343 }
344 81 lst->idx++;
345 81 eof = 0;
346
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 36 } else if (eof) {
347 4 return ret;
348 } else {
349 32 return 0;
350 }
351 }
352 }
353
354 ✗ static void bsf_list_flush(AVBSFContext *bsf)
355 {
356 ✗ BSFListContext *lst = bsf->priv_data;
357
358 ✗ for (int i = 0; i < lst->nb_bsfs; i++)
359 ✗ av_bsf_flush(lst->bsfs[i]);
360 ✗ lst->idx = 0;
361 ✗ }
362
363 4 static void bsf_list_close(AVBSFContext *bsf)
364 {
365 4 BSFListContext *lst = bsf->priv_data;
366 int i;
367
368
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 12 for (i = 0; i < lst->nb_bsfs; ++i)
369 8 av_bsf_free(&lst->bsfs[i]);
370 4 av_freep(&lst->bsfs);
371 4 av_freep(&lst->item_name);
372 4 }
373
374 ✗ static const char *bsf_list_item_name(void *ctx)
375 {
376 static const char *null_filter_name = "null";
377 ✗ AVBSFContext *bsf_ctx = ctx;
378 ✗ BSFListContext *lst = bsf_ctx->priv_data;
379
380 ✗ if (!lst->nb_bsfs)
381 ✗ return null_filter_name;
382
383 ✗ if (!lst->item_name) {
384 int i;
385 AVBPrint bp;
386 ✗ av_bprint_init(&bp, 16, 128);
387
388 ✗ av_bprintf(&bp, "bsf_list(");
389 ✗ for (i = 0; i < lst->nb_bsfs; i++)
390 ✗ av_bprintf(&bp, i ? ",%s" : "%s", lst->bsfs[i]->filter->name);
391 ✗ av_bprintf(&bp, ")");
392
393 ✗ av_bprint_finalize(&bp, &lst->item_name);
394 }
395
396 ✗ return lst->item_name;
397 }
398
399 static const AVClass bsf_list_class = {
400 .class_name = "bsf_list",
401 .item_name = bsf_list_item_name,
402 .version = LIBAVUTIL_VERSION_INT,
403 };
404
405 static const FFBitStreamFilter list_bsf = {
406 .p.name = "bsf_list",
407 .p.priv_class = &bsf_list_class,
408 .priv_data_size = sizeof(BSFListContext),
409 .init = bsf_list_init,
410 .filter = bsf_list_filter,
411 .flush = bsf_list_flush,
412 .close = bsf_list_close,
413 };
414
415 struct AVBSFList {
416 AVBSFContext **bsfs;
417 int nb_bsfs;
418 };
419
420 633 AVBSFList *av_bsf_list_alloc(void)
421 {
422 633 return av_mallocz(sizeof(AVBSFList));
423 }
424
425 ✗ void av_bsf_list_free(AVBSFList **lst)
426 {
427 int i;
428
429 ✗ if (!*lst)
430 ✗ return;
431
432 ✗ for (i = 0; i < (*lst)->nb_bsfs; ++i)
433 ✗ av_bsf_free(&(*lst)->bsfs[i]);
434 ✗ av_free((*lst)->bsfs);
435 ✗ av_freep(lst);
436 }
437
438 637 int av_bsf_list_append(AVBSFList *lst, AVBSFContext *bsf)
439 {
440 637 return av_dynarray_add_nofree(&lst->bsfs, &lst->nb_bsfs, bsf);
441 }
442
443 637 static int bsf_list_append_internal(AVBSFList *lst, const char *bsf_name, const char *options, AVDictionary ** options_dict)
444 {
445 int ret;
446 const AVBitStreamFilter *filter;
447 AVBSFContext *bsf;
448
449 637 filter = av_bsf_get_by_name(bsf_name);
450
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 637 if (!filter)
451 ✗ return AVERROR_BSF_NOT_FOUND;
452
453 637 ret = av_bsf_alloc(filter, &bsf);
454
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 637 if (ret < 0)
455 ✗ return ret;
456
457
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 637 if (options && filter->priv_class) {
458 31 const AVOption *opt = av_opt_next(bsf->priv_data, NULL);
459 31 const char * shorthand[2] = {NULL};
460
461
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 31 if (opt)
462 31 shorthand[0] = opt->name;
463
464 31 ret = av_opt_set_from_string(bsf->priv_data, options, shorthand, "=", ":");
465
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 31 if (ret < 0)
466 ✗ goto end;
467 }
468
469
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 637 if (options_dict) {
470 ✗ ret = av_opt_set_dict2(bsf, options_dict, AV_OPT_SEARCH_CHILDREN);
471 ✗ if (ret < 0)
472 ✗ goto end;
473 }
474
475 637 ret = av_bsf_list_append(lst, bsf);
476
477 637 end:
478
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 637 if (ret < 0)
479 ✗ av_bsf_free(&bsf);
480
481 637 return ret;
482 }
483
484 ✗ int av_bsf_list_append2(AVBSFList *lst, const char *bsf_name, AVDictionary ** options)
485 {
486 ✗ return bsf_list_append_internal(lst, bsf_name, NULL, options);
487 }
488
489 633 int av_bsf_list_finalize(AVBSFList **lst, AVBSFContext **bsf)
490 {
491 633 int ret = 0;
492 BSFListContext *ctx;
493
494
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 633 if ((*lst)->nb_bsfs == 1) {
495 629 *bsf = (*lst)->bsfs[0];
496 629 av_freep(&(*lst)->bsfs);
497 629 (*lst)->nb_bsfs = 0;
498 629 goto end;
499 }
500
501 4 ret = av_bsf_alloc(&list_bsf.p, bsf);
502
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 4 if (ret < 0)
503 ✗ return ret;
504
505 4 ctx = (*bsf)->priv_data;
506
507 4 ctx->bsfs = (*lst)->bsfs;
508 4 ctx->nb_bsfs = (*lst)->nb_bsfs;
509
510 633 end:
511 633 av_freep(lst);
512 633 return ret;
513 }
514
515 637 static int bsf_parse_single(char *str, AVBSFList *bsf_lst)
516 {
517 char *bsf_name, *bsf_options_str;
518
519 637 bsf_name = av_strtok(str, "=", &bsf_options_str);
520
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 637 if (!bsf_name)
521 ✗ return AVERROR(EINVAL);
522
523 637 return bsf_list_append_internal(bsf_lst, bsf_name, bsf_options_str, NULL);
524 }
525
526 16041 int av_bsf_list_parse_str(const char *str, AVBSFContext **bsf_lst)
527 {
528 AVBSFList *lst;
529 int ret;
530
531
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 16041 if (!str)
532 15408 return av_bsf_get_null_filter(bsf_lst);
533
534 633 lst = av_bsf_list_alloc();
535
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 633 if (!lst)
536 ✗ return AVERROR(ENOMEM);
537
538 do {
539 637 char *bsf_str = av_get_token(&str, ",");
540 637 ret = bsf_parse_single(bsf_str, lst);
541 637 av_free(bsf_str);
542
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 637 if (ret < 0)
543 ✗ goto end;
544
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 637 } while (*str && *++str);
545
546 633 ret = av_bsf_list_finalize(&lst, bsf_lst);
547 633 end:
548
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 633 if (ret < 0)
549 ✗ av_bsf_list_free(&lst);
550 633 return ret;
551 }
552
553 15408 int av_bsf_get_null_filter(AVBSFContext **bsf)
554 {
555 #if CONFIG_NULL_BSF
556 extern const FFBitStreamFilter ff_null_bsf;
557 15408 return av_bsf_alloc(&ff_null_bsf.p, bsf);
558 #else
559 return av_bsf_alloc(&list_bsf.p, bsf);
560 #endif
561 }
562