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path: root/libavcodec/bsf.c (plain)
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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/avassert.h"
25#include "libavutil/avstring.h"
26#include "libavutil/bprint.h"
27
28#include "avcodec.h"
29#include "bsf.h"
30
31struct AVBSFInternal {
32 AVPacket *buffer_pkt;
33 int eof;
34};
35
36void av_bsf_free(AVBSFContext **pctx)
37{
38 AVBSFContext *ctx;
39
40 if (!pctx || !*pctx)
41 return;
42 ctx = *pctx;
43
44 if (ctx->filter->close)
45 ctx->filter->close(ctx);
46 if (ctx->filter->priv_class && ctx->priv_data)
47 av_opt_free(ctx->priv_data);
48
49 av_opt_free(ctx);
50
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
61static 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
69static 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
77const AVClass *av_bsf_get_class(void)
78{
79 return &bsf_class;
80}
81
82int 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;
130fail:
131 av_bsf_free(&ctx);
132 return ret;
133}
134
135int 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
176int av_bsf_send_packet(AVBSFContext *ctx, AVPacket *pkt)
177{
178 if (!pkt) {
179 ctx->internal->eof = 1;
180 return 0;
181 }
182
183 av_assert0(pkt->data || pkt->side_data);
184
185 if (ctx->internal->eof) {
186 av_log(ctx, AV_LOG_ERROR, "A non-NULL packet sent after an EOF.\n");
187 return AVERROR(EINVAL);
188 }
189
190 if (ctx->internal->buffer_pkt->data ||
191 ctx->internal->buffer_pkt->side_data_elems)
192 return AVERROR(EAGAIN);
193
194 av_packet_move_ref(ctx->internal->buffer_pkt, pkt);
195
196 return 0;
197}
198
199int av_bsf_receive_packet(AVBSFContext *ctx, AVPacket *pkt)
200{
201 return ctx->filter->filter(ctx, pkt);
202}
203
204int ff_bsf_get_packet(AVBSFContext *ctx, AVPacket **pkt)
205{
206 AVBSFInternal *in = ctx->internal;
207 AVPacket *tmp_pkt;
208
209 if (in->eof)
210 return AVERROR_EOF;
211
212 if (!ctx->internal->buffer_pkt->data &&
213 !ctx->internal->buffer_pkt->side_data_elems)
214 return AVERROR(EAGAIN);
215
216 tmp_pkt = av_packet_alloc();
217 if (!tmp_pkt)
218 return AVERROR(ENOMEM);
219
220 *pkt = ctx->internal->buffer_pkt;
221 ctx->internal->buffer_pkt = tmp_pkt;
222
223 return 0;
224}
225
226int ff_bsf_get_packet_ref(AVBSFContext *ctx, AVPacket *pkt)
227{
228 AVBSFInternal *in = ctx->internal;
229
230 if (in->eof)
231 return AVERROR_EOF;
232
233 if (!ctx->internal->buffer_pkt->data &&
234 !ctx->internal->buffer_pkt->side_data_elems)
235 return AVERROR(EAGAIN);
236
237 av_packet_move_ref(pkt, ctx->internal->buffer_pkt);
238
239 return 0;
240}
241
242typedef struct BSFListContext {
243 const AVClass *class;
244
245 AVBSFContext **bsfs;
246 int nb_bsfs;
247
248 unsigned idx; // index of currently processed BSF
249 unsigned flushed_idx; // index of BSF being flushed
250
251 char * item_name;
252} BSFListContext;
253
254
255static int bsf_list_init(AVBSFContext *bsf)
256{
257 BSFListContext *lst = bsf->priv_data;
258 int ret, i;
259 const AVCodecParameters *cod_par = bsf->par_in;
260 AVRational tb = bsf->time_base_in;
261
262 for (i = 0; i < lst->nb_bsfs; ++i) {
263 ret = avcodec_parameters_copy(lst->bsfs[i]->par_in, cod_par);
264 if (ret < 0)
265 goto fail;
266
267 lst->bsfs[i]->time_base_in = tb;
268
269 ret = av_bsf_init(lst->bsfs[i]);
270 if (ret < 0)
271 goto fail;
272
273 cod_par = lst->bsfs[i]->par_out;
274 tb = lst->bsfs[i]->time_base_out;
275 }
276
277 bsf->time_base_out = tb;
278 ret = avcodec_parameters_copy(bsf->par_out, cod_par);
279
280fail:
281 return ret;
282}
283
284static int bsf_list_filter(AVBSFContext *bsf, AVPacket *out)
285{
286 BSFListContext *lst = bsf->priv_data;
287 int ret;
288
289 if (!lst->nb_bsfs)
290 return ff_bsf_get_packet_ref(bsf, out);
291
292 while (1) {
293 if (lst->idx > lst->flushed_idx) {
294 ret = av_bsf_receive_packet(lst->bsfs[lst->idx-1], out);
295 if (ret == AVERROR(EAGAIN)) {
296 /* no more packets from idx-1, try with previous */
297 ret = 0;
298 lst->idx--;
299 continue;
300 } else if (ret == AVERROR_EOF) {
301 /* filter idx-1 is done, continue with idx...nb_bsfs */
302 lst->flushed_idx = lst->idx;
303 continue;
304 }else if (ret < 0) {
305 /* filtering error */
306 break;
307 }
308 } else {
309 ret = ff_bsf_get_packet_ref(bsf, out);
310 if (ret == AVERROR_EOF) {
311 lst->idx = lst->flushed_idx;
312 } else if (ret < 0)
313 break;
314 }
315
316 if (lst->idx < lst->nb_bsfs) {
317 AVPacket *pkt;
318 if (ret == AVERROR_EOF && lst->idx == lst->flushed_idx) {
319 /* ff_bsf_get_packet_ref returned EOF and idx is first
320 * filter of yet not flushed filter chain */
321 pkt = NULL;
322 } else {
323 pkt = out;
324 }
325 ret = av_bsf_send_packet(lst->bsfs[lst->idx], pkt);
326 if (ret < 0)
327 break;
328 lst->idx++;
329 } else {
330 /* The end of filter chain, break to return result */
331 break;
332 }
333 }
334
335 if (ret < 0)
336 av_packet_unref(out);
337
338 return ret;
339}
340
341static void bsf_list_close(AVBSFContext *bsf)
342{
343 BSFListContext *lst = bsf->priv_data;
344 int i;
345
346 for (i = 0; i < lst->nb_bsfs; ++i)
347 av_bsf_free(&lst->bsfs[i]);
348 av_freep(&lst->bsfs);
349 av_freep(&lst->item_name);
350}
351
352static const char *bsf_list_item_name(void *ctx)
353{
354 static const char *null_filter_name = "null";
355 AVBSFContext *bsf_ctx = ctx;
356 BSFListContext *lst = bsf_ctx->priv_data;
357
358 if (!lst->nb_bsfs)
359 return null_filter_name;
360
361 if (!lst->item_name) {
362 int i;
363 AVBPrint bp;
364 av_bprint_init(&bp, 16, 128);
365
366 av_bprintf(&bp, "bsf_list(");
367 for (i = 0; i < lst->nb_bsfs; i++)
368 av_bprintf(&bp, i ? ",%s" : "%s", lst->bsfs[i]->filter->name);
369 av_bprintf(&bp, ")");
370
371 av_bprint_finalize(&bp, &lst->item_name);
372 }
373
374 return lst->item_name;
375}
376
377static const AVClass bsf_list_class = {
378 .class_name = "bsf_list",
379 .item_name = bsf_list_item_name,
380 .version = LIBAVUTIL_VERSION_INT,
381};
382
383const AVBitStreamFilter ff_list_bsf = {
384 .name = "bsf_list",
385 .priv_data_size = sizeof(BSFListContext),
386 .priv_class = &bsf_list_class,
387 .init = bsf_list_init,
388 .filter = bsf_list_filter,
389 .close = bsf_list_close,
390};
391
392struct AVBSFList {
393 AVBSFContext **bsfs;
394 int nb_bsfs;
395};
396
397AVBSFList *av_bsf_list_alloc(void)
398{
399 return av_mallocz(sizeof(AVBSFList));
400}
401
402void av_bsf_list_free(AVBSFList **lst)
403{
404 int i;
405
406 if (!*lst)
407 return;
408
409 for (i = 0; i < (*lst)->nb_bsfs; ++i)
410 av_bsf_free(&(*lst)->bsfs[i]);
411 av_free((*lst)->bsfs);
412 av_freep(lst);
413}
414
415int av_bsf_list_append(AVBSFList *lst, AVBSFContext *bsf)
416{
417 return av_dynarray_add_nofree(&lst->bsfs, &lst->nb_bsfs, bsf);
418}
419
420int av_bsf_list_append2(AVBSFList *lst, const char *bsf_name, AVDictionary ** options)
421{
422 int ret;
423 const AVBitStreamFilter *filter;
424 AVBSFContext *bsf;
425
426 filter = av_bsf_get_by_name(bsf_name);
427 if (!filter)
428 return AVERROR_BSF_NOT_FOUND;
429
430 ret = av_bsf_alloc(filter, &bsf);
431 if (ret < 0)
432 return ret;
433
434 if (options) {
435 ret = av_opt_set_dict2(bsf, options, AV_OPT_SEARCH_CHILDREN);
436 if (ret < 0)
437 goto end;
438 }
439
440 ret = av_bsf_list_append(lst, bsf);
441
442end:
443 if (ret < 0)
444 av_bsf_free(&bsf);
445
446 return ret;
447}
448
449int av_bsf_list_finalize(AVBSFList **lst, AVBSFContext **bsf)
450{
451 int ret = 0;
452 BSFListContext *ctx;
453
454 if ((*lst)->nb_bsfs == 1) {
455 *bsf = (*lst)->bsfs[0];
456 av_freep(&(*lst)->bsfs);
457 (*lst)->nb_bsfs = 0;
458 goto end;
459 }
460
461 ret = av_bsf_alloc(&ff_list_bsf, bsf);
462 if (ret < 0)
463 return ret;
464
465 ctx = (*bsf)->priv_data;
466
467 ctx->bsfs = (*lst)->bsfs;
468 ctx->nb_bsfs = (*lst)->nb_bsfs;
469
470end:
471 av_freep(lst);
472 return ret;
473}
474
475static int bsf_parse_single(const char *str, AVBSFList *bsf_lst)
476{
477 char *bsf_name, *bsf_options_str, *buf;
478 AVDictionary *bsf_options = NULL;
479 int ret = 0;
480
481 if (!(buf = av_strdup(str)))
482 return AVERROR(ENOMEM);
483
484 bsf_name = av_strtok(buf, "=", &bsf_options_str);
485 if (!bsf_name) {
486 ret = AVERROR(EINVAL);
487 goto end;
488 }
489
490 if (bsf_options_str) {
491 ret = av_dict_parse_string(&bsf_options, bsf_options_str, "=", ":", 0);
492 if (ret < 0)
493 goto end;
494 }
495
496 ret = av_bsf_list_append2(bsf_lst, bsf_name, &bsf_options);
497
498 av_dict_free(&bsf_options);
499end:
500 av_free(buf);
501 return ret;
502}
503
504int av_bsf_list_parse_str(const char *str, AVBSFContext **bsf_lst)
505{
506 AVBSFList *lst;
507 char *bsf_str, *buf, *dup, *saveptr;
508 int ret;
509
510 if (!str)
511 return av_bsf_get_null_filter(bsf_lst);
512
513 lst = av_bsf_list_alloc();
514 if (!lst)
515 return AVERROR(ENOMEM);
516
517 if (!(dup = buf = av_strdup(str))) {
518 ret = AVERROR(ENOMEM);
519 goto end;
520 }
521
522 while (1) {
523 bsf_str = av_strtok(buf, ",", &saveptr);
524 if (!bsf_str)
525 break;
526
527 ret = bsf_parse_single(bsf_str, lst);
528 if (ret < 0)
529 goto end;
530
531 buf = NULL;
532 }
533
534 ret = av_bsf_list_finalize(&lst, bsf_lst);
535end:
536 if (ret < 0)
537 av_bsf_list_free(&lst);
538 av_free(dup);
539 return ret;
540}
541
542int av_bsf_get_null_filter(AVBSFContext **bsf)
543{
544 return av_bsf_alloc(&ff_list_bsf, bsf);
545}
546
generated by cgit at 2024-05-17 06:08:21 (GMT)