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 "libavutil/log.h"
22 #include "libavutil/mem.h"
23 #include "libavutil/opt.h"
24 #include "libavutil/avstring.h"
25 #include "libavutil/bprint.h"
26
27 #include "avcodec.h"
28 #include "bsf.h"
29
30 struct AVBSFInternal {
31 AVPacket *buffer_pkt;
32 int eof;
33 };
34
av_bsf_free(AVBSFContext ** pctx)35 void av_bsf_free(AVBSFContext **pctx)
36 {
37 AVBSFContext *ctx;
38
39 if (!pctx || !*pctx)
40 return;
41 ctx = *pctx;
42
43 if (ctx->filter->close)
44 ctx->filter->close(ctx);
45 if (ctx->filter->priv_class && ctx->priv_data)
46 av_opt_free(ctx->priv_data);
47
48 av_opt_free(ctx);
49
50 if (ctx->internal)
51 av_packet_free(&ctx->internal->buffer_pkt);
52 av_freep(&ctx->internal);
53 av_freep(&ctx->priv_data);
54
55 avcodec_parameters_free(&ctx->par_in);
56 avcodec_parameters_free(&ctx->par_out);
57
58 av_freep(pctx);
59 }
60
bsf_child_next(void * obj,void * prev)61 static void *bsf_child_next(void *obj, void *prev)
62 {
63 AVBSFContext *ctx = obj;
64 if (!prev && ctx->filter->priv_class)
65 return ctx->priv_data;
66 return NULL;
67 }
68
69 static const AVClass bsf_class = {
70 .class_name = "AVBSFContext",
71 .item_name = av_default_item_name,
72 .version = LIBAVUTIL_VERSION_INT,
73 .child_next = bsf_child_next,
74 .child_class_next = ff_bsf_child_class_next,
75 };
76
av_bsf_get_class(void)77 const AVClass *av_bsf_get_class(void)
78 {
79 return &bsf_class;
80 }
81
av_bsf_alloc(const AVBitStreamFilter * filter,AVBSFContext ** pctx)82 int av_bsf_alloc(const AVBitStreamFilter *filter, AVBSFContext **pctx)
83 {
84 AVBSFContext *ctx;
85 int ret;
86
87 ctx = av_mallocz(sizeof(*ctx));
88 if (!ctx)
89 return AVERROR(ENOMEM);
90
91 ctx->av_class = &bsf_class;
92 ctx->filter = filter;
93
94 ctx->par_in = avcodec_parameters_alloc();
95 ctx->par_out = avcodec_parameters_alloc();
96 if (!ctx->par_in || !ctx->par_out) {
97 ret = AVERROR(ENOMEM);
98 goto fail;
99 }
100
101 ctx->internal = av_mallocz(sizeof(*ctx->internal));
102 if (!ctx->internal) {
103 ret = AVERROR(ENOMEM);
104 goto fail;
105 }
106
107 ctx->internal->buffer_pkt = av_packet_alloc();
108 if (!ctx->internal->buffer_pkt) {
109 ret = AVERROR(ENOMEM);
110 goto fail;
111 }
112
113 av_opt_set_defaults(ctx);
114
115 /* allocate priv data and init private options */
116 if (filter->priv_data_size) {
117 ctx->priv_data = av_mallocz(filter->priv_data_size);
118 if (!ctx->priv_data) {
119 ret = AVERROR(ENOMEM);
120 goto fail;
121 }
122 if (filter->priv_class) {
123 *(const AVClass **)ctx->priv_data = filter->priv_class;
124 av_opt_set_defaults(ctx->priv_data);
125 }
126 }
127
128 *pctx = ctx;
129 return 0;
130 fail:
131 av_bsf_free(&ctx);
132 return ret;
133 }
134
av_bsf_init(AVBSFContext * ctx)135 int av_bsf_init(AVBSFContext *ctx)
136 {
137 int ret, i;
138
139 /* check that the codec is supported */
140 if (ctx->filter->codec_ids) {
141 for (i = 0; ctx->filter->codec_ids[i] != AV_CODEC_ID_NONE; i++)
142 if (ctx->par_in->codec_id == ctx->filter->codec_ids[i])
143 break;
144 if (ctx->filter->codec_ids[i] == AV_CODEC_ID_NONE) {
145 const AVCodecDescriptor *desc = avcodec_descriptor_get(ctx->par_in->codec_id);
146 av_log(ctx, AV_LOG_ERROR, "Codec '%s' (%d) is not supported by the "
147 "bitstream filter '%s'. Supported codecs are: ",
148 desc ? desc->name : "unknown", ctx->par_in->codec_id, ctx->filter->name);
149 for (i = 0; ctx->filter->codec_ids[i] != AV_CODEC_ID_NONE; i++) {
150 desc = avcodec_descriptor_get(ctx->filter->codec_ids[i]);
151 av_log(ctx, AV_LOG_ERROR, "%s (%d) ",
152 desc ? desc->name : "unknown", ctx->filter->codec_ids[i]);
153 }
154 av_log(ctx, AV_LOG_ERROR, "\n");
155 return AVERROR(EINVAL);
156 }
157 }
158
159 /* initialize output parameters to be the same as input
160 * init below might overwrite that */
161 ret = avcodec_parameters_copy(ctx->par_out, ctx->par_in);
162 if (ret < 0)
163 return ret;
164
165 ctx->time_base_out = ctx->time_base_in;
166
167 if (ctx->filter->init) {
168 ret = ctx->filter->init(ctx);
169 if (ret < 0)
170 return ret;
171 }
172
173 return 0;
174 }
175
av_bsf_flush(AVBSFContext * ctx)176 void av_bsf_flush(AVBSFContext *ctx)
177 {
178 ctx->internal->eof = 0;
179
180 av_packet_unref(ctx->internal->buffer_pkt);
181
182 if (ctx->filter->flush)
183 ctx->filter->flush(ctx);
184 }
185
av_bsf_send_packet(AVBSFContext * ctx,AVPacket * pkt)186 int av_bsf_send_packet(AVBSFContext *ctx, AVPacket *pkt)
187 {
188 int ret;
189
190 if (!pkt || (!pkt->data && !pkt->side_data_elems)) {
191 ctx->internal->eof = 1;
192 return 0;
193 }
194
195 if (ctx->internal->eof) {
196 av_log(ctx, AV_LOG_ERROR, "A non-NULL packet sent after an EOF.\n");
197 return AVERROR(EINVAL);
198 }
199
200 if (ctx->internal->buffer_pkt->data ||
201 ctx->internal->buffer_pkt->side_data_elems)
202 return AVERROR(EAGAIN);
203
204 ret = av_packet_make_refcounted(pkt);
205 if (ret < 0)
206 return ret;
207 av_packet_move_ref(ctx->internal->buffer_pkt, pkt);
208
209 return 0;
210 }
211
av_bsf_receive_packet(AVBSFContext * ctx,AVPacket * pkt)212 int av_bsf_receive_packet(AVBSFContext *ctx, AVPacket *pkt)
213 {
214 return ctx->filter->filter(ctx, pkt);
215 }
216
ff_bsf_get_packet(AVBSFContext * ctx,AVPacket ** pkt)217 int ff_bsf_get_packet(AVBSFContext *ctx, AVPacket **pkt)
218 {
219 AVBSFInternal *in = ctx->internal;
220 AVPacket *tmp_pkt;
221
222 if (in->eof)
223 return AVERROR_EOF;
224
225 if (!ctx->internal->buffer_pkt->data &&
226 !ctx->internal->buffer_pkt->side_data_elems)
227 return AVERROR(EAGAIN);
228
229 tmp_pkt = av_packet_alloc();
230 if (!tmp_pkt)
231 return AVERROR(ENOMEM);
232
233 *pkt = ctx->internal->buffer_pkt;
234 ctx->internal->buffer_pkt = tmp_pkt;
235
236 return 0;
237 }
238
ff_bsf_get_packet_ref(AVBSFContext * ctx,AVPacket * pkt)239 int ff_bsf_get_packet_ref(AVBSFContext *ctx, AVPacket *pkt)
240 {
241 AVBSFInternal *in = ctx->internal;
242
243 if (in->eof)
244 return AVERROR_EOF;
245
246 if (!ctx->internal->buffer_pkt->data &&
247 !ctx->internal->buffer_pkt->side_data_elems)
248 return AVERROR(EAGAIN);
249
250 av_packet_move_ref(pkt, ctx->internal->buffer_pkt);
251
252 return 0;
253 }
254
255 typedef struct BSFListContext {
256 const AVClass *class;
257
258 AVBSFContext **bsfs;
259 int nb_bsfs;
260
261 unsigned idx; // index of currently processed BSF
262 unsigned flushed_idx; // index of BSF being flushed
263
264 char * item_name;
265 } BSFListContext;
266
267
bsf_list_init(AVBSFContext * bsf)268 static int bsf_list_init(AVBSFContext *bsf)
269 {
270 BSFListContext *lst = bsf->priv_data;
271 int ret, i;
272 const AVCodecParameters *cod_par = bsf->par_in;
273 AVRational tb = bsf->time_base_in;
274
275 for (i = 0; i < lst->nb_bsfs; ++i) {
276 ret = avcodec_parameters_copy(lst->bsfs[i]->par_in, cod_par);
277 if (ret < 0)
278 goto fail;
279
280 lst->bsfs[i]->time_base_in = tb;
281
282 ret = av_bsf_init(lst->bsfs[i]);
283 if (ret < 0)
284 goto fail;
285
286 cod_par = lst->bsfs[i]->par_out;
287 tb = lst->bsfs[i]->time_base_out;
288 }
289
290 bsf->time_base_out = tb;
291 ret = avcodec_parameters_copy(bsf->par_out, cod_par);
292
293 fail:
294 return ret;
295 }
296
bsf_list_filter(AVBSFContext * bsf,AVPacket * out)297 static int bsf_list_filter(AVBSFContext *bsf, AVPacket *out)
298 {
299 BSFListContext *lst = bsf->priv_data;
300 int ret;
301
302 if (!lst->nb_bsfs)
303 return ff_bsf_get_packet_ref(bsf, out);
304
305 while (1) {
306 if (lst->idx > lst->flushed_idx) {
307 ret = av_bsf_receive_packet(lst->bsfs[lst->idx-1], out);
308 if (ret == AVERROR(EAGAIN)) {
309 /* no more packets from idx-1, try with previous */
310 ret = 0;
311 lst->idx--;
312 continue;
313 } else if (ret == AVERROR_EOF) {
314 /* filter idx-1 is done, continue with idx...nb_bsfs */
315 lst->flushed_idx = lst->idx;
316 continue;
317 }else if (ret < 0) {
318 /* filtering error */
319 break;
320 }
321 } else {
322 ret = ff_bsf_get_packet_ref(bsf, out);
323 if (ret == AVERROR_EOF) {
324 lst->idx = lst->flushed_idx;
325 } else if (ret < 0)
326 break;
327 }
328
329 if (lst->idx < lst->nb_bsfs) {
330 AVPacket *pkt;
331 if (ret == AVERROR_EOF && lst->idx == lst->flushed_idx) {
332 /* ff_bsf_get_packet_ref returned EOF and idx is first
333 * filter of yet not flushed filter chain */
334 pkt = NULL;
335 } else {
336 pkt = out;
337 }
338 ret = av_bsf_send_packet(lst->bsfs[lst->idx], pkt);
339 if (ret < 0)
340 break;
341 lst->idx++;
342 } else {
343 /* The end of filter chain, break to return result */
344 break;
345 }
346 }
347
348 if (ret < 0)
349 av_packet_unref(out);
350
351 return ret;
352 }
353
bsf_list_flush(AVBSFContext * bsf)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 = lst->flushed_idx = 0;
361 }
362
bsf_list_close(AVBSFContext * bsf)363 static void bsf_list_close(AVBSFContext *bsf)
364 {
365 BSFListContext *lst = bsf->priv_data;
366 int i;
367
368 for (i = 0; i < lst->nb_bsfs; ++i)
369 av_bsf_free(&lst->bsfs[i]);
370 av_freep(&lst->bsfs);
371 av_freep(&lst->item_name);
372 }
373
bsf_list_item_name(void * ctx)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 const AVBitStreamFilter ff_list_bsf = {
406 .name = "bsf_list",
407 .priv_data_size = sizeof(BSFListContext),
408 .priv_class = &bsf_list_class,
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
av_bsf_list_alloc(void)420 AVBSFList *av_bsf_list_alloc(void)
421 {
422 return av_mallocz(sizeof(AVBSFList));
423 }
424
av_bsf_list_free(AVBSFList ** lst)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
av_bsf_list_append(AVBSFList * lst,AVBSFContext * bsf)438 int av_bsf_list_append(AVBSFList *lst, AVBSFContext *bsf)
439 {
440 return av_dynarray_add_nofree(&lst->bsfs, &lst->nb_bsfs, bsf);
441 }
442
av_bsf_list_append2(AVBSFList * lst,const char * bsf_name,AVDictionary ** options)443 int av_bsf_list_append2(AVBSFList *lst, const char *bsf_name, AVDictionary ** options)
444 {
445 int ret;
446 const AVBitStreamFilter *filter;
447 AVBSFContext *bsf;
448
449 filter = av_bsf_get_by_name(bsf_name);
450 if (!filter)
451 return AVERROR_BSF_NOT_FOUND;
452
453 ret = av_bsf_alloc(filter, &bsf);
454 if (ret < 0)
455 return ret;
456
457 if (options) {
458 ret = av_opt_set_dict2(bsf, options, AV_OPT_SEARCH_CHILDREN);
459 if (ret < 0)
460 goto end;
461 }
462
463 ret = av_bsf_list_append(lst, bsf);
464
465 end:
466 if (ret < 0)
467 av_bsf_free(&bsf);
468
469 return ret;
470 }
471
av_bsf_list_finalize(AVBSFList ** lst,AVBSFContext ** bsf)472 int av_bsf_list_finalize(AVBSFList **lst, AVBSFContext **bsf)
473 {
474 int ret = 0;
475 BSFListContext *ctx;
476
477 if ((*lst)->nb_bsfs == 1) {
478 *bsf = (*lst)->bsfs[0];
479 av_freep(&(*lst)->bsfs);
480 (*lst)->nb_bsfs = 0;
481 goto end;
482 }
483
484 ret = av_bsf_alloc(&ff_list_bsf, bsf);
485 if (ret < 0)
486 return ret;
487
488 ctx = (*bsf)->priv_data;
489
490 ctx->bsfs = (*lst)->bsfs;
491 ctx->nb_bsfs = (*lst)->nb_bsfs;
492
493 end:
494 av_freep(lst);
495 return ret;
496 }
497
bsf_parse_single(const char * str,AVBSFList * bsf_lst)498 static int bsf_parse_single(const char *str, AVBSFList *bsf_lst)
499 {
500 char *bsf_name, *bsf_options_str, *buf;
501 AVDictionary *bsf_options = NULL;
502 int ret = 0;
503
504 if (!(buf = av_strdup(str)))
505 return AVERROR(ENOMEM);
506
507 bsf_name = av_strtok(buf, "=", &bsf_options_str);
508 if (!bsf_name) {
509 ret = AVERROR(EINVAL);
510 goto end;
511 }
512
513 if (bsf_options_str) {
514 ret = av_dict_parse_string(&bsf_options, bsf_options_str, "=", ":", 0);
515 if (ret < 0)
516 goto end;
517 }
518
519 ret = av_bsf_list_append2(bsf_lst, bsf_name, &bsf_options);
520
521 av_dict_free(&bsf_options);
522 end:
523 av_free(buf);
524 return ret;
525 }
526
av_bsf_list_parse_str(const char * str,AVBSFContext ** bsf_lst)527 int av_bsf_list_parse_str(const char *str, AVBSFContext **bsf_lst)
528 {
529 AVBSFList *lst;
530 char *bsf_str, *buf, *dup, *saveptr;
531 int ret;
532
533 if (!str)
534 return av_bsf_get_null_filter(bsf_lst);
535
536 lst = av_bsf_list_alloc();
537 if (!lst)
538 return AVERROR(ENOMEM);
539
540 if (!(dup = buf = av_strdup(str))) {
541 ret = AVERROR(ENOMEM);
542 goto end;
543 }
544
545 while (1) {
546 bsf_str = av_strtok(buf, ",", &saveptr);
547 if (!bsf_str)
548 break;
549
550 ret = bsf_parse_single(bsf_str, lst);
551 if (ret < 0)
552 goto end;
553
554 buf = NULL;
555 }
556
557 ret = av_bsf_list_finalize(&lst, bsf_lst);
558 end:
559 if (ret < 0)
560 av_bsf_list_free(&lst);
561 av_free(dup);
562 return ret;
563 }
564
av_bsf_get_null_filter(AVBSFContext ** bsf)565 int av_bsf_get_null_filter(AVBSFContext **bsf)
566 {
567 return av_bsf_alloc(&ff_list_bsf, bsf);
568 }
569