2 * This file is part of FFmpeg.
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.
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.
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
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"
30 struct AVBSFInternal {
35 void av_bsf_free(AVBSFContext **pctx)
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);
49 av_packet_free(&ctx->internal->buffer_pkt);
50 av_freep(&ctx->internal);
51 av_freep(&ctx->priv_data);
53 avcodec_parameters_free(&ctx->par_in);
54 avcodec_parameters_free(&ctx->par_out);
59 static void *bsf_child_next(void *obj, void *prev)
61 AVBSFContext *ctx = obj;
62 if (!prev && ctx->filter->priv_class)
63 return ctx->priv_data;
67 static const char *bsf_to_name(void *bsf)
69 return ((AVBSFContext *)bsf)->filter->name;
72 static const AVClass bsf_class = {
73 .class_name = "AVBSFContext",
74 .item_name = bsf_to_name,
75 .version = LIBAVUTIL_VERSION_INT,
76 .child_next = bsf_child_next,
77 .child_class_next = ff_bsf_child_class_next,
78 .category = AV_CLASS_CATEGORY_BITSTREAM_FILTER,
81 const AVClass *av_bsf_get_class(void)
86 int av_bsf_alloc(const AVBitStreamFilter *filter, AVBSFContext **pctx)
92 ctx = av_mallocz(sizeof(*ctx));
94 return AVERROR(ENOMEM);
96 ctx->av_class = &bsf_class;
99 ctx->par_in = avcodec_parameters_alloc();
100 ctx->par_out = avcodec_parameters_alloc();
101 if (!ctx->par_in || !ctx->par_out) {
102 ret = AVERROR(ENOMEM);
106 bsfi = av_mallocz(sizeof(*bsfi));
108 ret = AVERROR(ENOMEM);
111 ctx->internal = bsfi;
113 bsfi->buffer_pkt = av_packet_alloc();
114 if (!bsfi->buffer_pkt) {
115 ret = AVERROR(ENOMEM);
119 /* allocate priv data and init private options */
120 if (filter->priv_data_size) {
121 ctx->priv_data = av_mallocz(filter->priv_data_size);
122 if (!ctx->priv_data) {
123 ret = AVERROR(ENOMEM);
126 if (filter->priv_class) {
127 *(const AVClass **)ctx->priv_data = filter->priv_class;
128 av_opt_set_defaults(ctx->priv_data);
139 int av_bsf_init(AVBSFContext *ctx)
143 /* check that the codec is supported */
144 if (ctx->filter->codec_ids) {
145 for (i = 0; ctx->filter->codec_ids[i] != AV_CODEC_ID_NONE; i++)
146 if (ctx->par_in->codec_id == ctx->filter->codec_ids[i])
148 if (ctx->filter->codec_ids[i] == AV_CODEC_ID_NONE) {
149 const AVCodecDescriptor *desc = avcodec_descriptor_get(ctx->par_in->codec_id);
150 av_log(ctx, AV_LOG_ERROR, "Codec '%s' (%d) is not supported by the "
151 "bitstream filter '%s'. Supported codecs are: ",
152 desc ? desc->name : "unknown", ctx->par_in->codec_id, ctx->filter->name);
153 for (i = 0; ctx->filter->codec_ids[i] != AV_CODEC_ID_NONE; i++) {
154 desc = avcodec_descriptor_get(ctx->filter->codec_ids[i]);
155 av_log(ctx, AV_LOG_ERROR, "%s (%d) ",
156 desc ? desc->name : "unknown", ctx->filter->codec_ids[i]);
158 av_log(ctx, AV_LOG_ERROR, "\n");
159 return AVERROR(EINVAL);
163 /* initialize output parameters to be the same as input
164 * init below might overwrite that */
165 ret = avcodec_parameters_copy(ctx->par_out, ctx->par_in);
169 ctx->time_base_out = ctx->time_base_in;
171 if (ctx->filter->init) {
172 ret = ctx->filter->init(ctx);
180 void av_bsf_flush(AVBSFContext *ctx)
182 AVBSFInternal *bsfi = ctx->internal;
186 av_packet_unref(bsfi->buffer_pkt);
188 if (ctx->filter->flush)
189 ctx->filter->flush(ctx);
192 int av_bsf_send_packet(AVBSFContext *ctx, AVPacket *pkt)
194 AVBSFInternal *bsfi = ctx->internal;
197 if (!pkt || (!pkt->data && !pkt->side_data_elems)) {
203 av_log(ctx, AV_LOG_ERROR, "A non-NULL packet sent after an EOF.\n");
204 return AVERROR(EINVAL);
207 if (bsfi->buffer_pkt->data ||
208 bsfi->buffer_pkt->side_data_elems)
209 return AVERROR(EAGAIN);
211 ret = av_packet_make_refcounted(pkt);
214 av_packet_move_ref(bsfi->buffer_pkt, pkt);
219 int av_bsf_receive_packet(AVBSFContext *ctx, AVPacket *pkt)
221 return ctx->filter->filter(ctx, pkt);
224 int ff_bsf_get_packet(AVBSFContext *ctx, AVPacket **pkt)
226 AVBSFInternal *bsfi = ctx->internal;
232 if (!bsfi->buffer_pkt->data &&
233 !bsfi->buffer_pkt->side_data_elems)
234 return AVERROR(EAGAIN);
236 tmp_pkt = av_packet_alloc();
238 return AVERROR(ENOMEM);
240 *pkt = bsfi->buffer_pkt;
241 bsfi->buffer_pkt = tmp_pkt;
246 int ff_bsf_get_packet_ref(AVBSFContext *ctx, AVPacket *pkt)
248 AVBSFInternal *bsfi = ctx->internal;
253 if (!bsfi->buffer_pkt->data &&
254 !bsfi->buffer_pkt->side_data_elems)
255 return AVERROR(EAGAIN);
257 av_packet_move_ref(pkt, bsfi->buffer_pkt);
262 typedef struct BSFListContext {
263 const AVClass *class;
268 unsigned idx; // index of currently processed BSF
269 unsigned flushed_idx; // index of BSF being flushed
275 static int bsf_list_init(AVBSFContext *bsf)
277 BSFListContext *lst = bsf->priv_data;
279 const AVCodecParameters *cod_par = bsf->par_in;
280 AVRational tb = bsf->time_base_in;
282 for (i = 0; i < lst->nb_bsfs; ++i) {
283 ret = avcodec_parameters_copy(lst->bsfs[i]->par_in, cod_par);
287 lst->bsfs[i]->time_base_in = tb;
289 ret = av_bsf_init(lst->bsfs[i]);
293 cod_par = lst->bsfs[i]->par_out;
294 tb = lst->bsfs[i]->time_base_out;
297 bsf->time_base_out = tb;
298 ret = avcodec_parameters_copy(bsf->par_out, cod_par);
304 static int bsf_list_filter(AVBSFContext *bsf, AVPacket *out)
306 BSFListContext *lst = bsf->priv_data;
310 return ff_bsf_get_packet_ref(bsf, out);
313 if (lst->idx > lst->flushed_idx) {
314 ret = av_bsf_receive_packet(lst->bsfs[lst->idx-1], out);
315 if (ret == AVERROR(EAGAIN)) {
316 /* no more packets from idx-1, try with previous */
319 } else if (ret == AVERROR_EOF) {
320 /* filter idx-1 is done, continue with idx...nb_bsfs */
321 lst->flushed_idx = lst->idx;
324 /* filtering error */
328 ret = ff_bsf_get_packet_ref(bsf, out);
329 if (ret == AVERROR_EOF) {
330 lst->idx = lst->flushed_idx;
335 if (lst->idx < lst->nb_bsfs) {
337 if (ret == AVERROR_EOF && lst->idx == lst->flushed_idx) {
338 /* ff_bsf_get_packet_ref returned EOF and idx is first
339 * filter of yet not flushed filter chain */
344 ret = av_bsf_send_packet(lst->bsfs[lst->idx], pkt);
349 /* The end of filter chain, break to return result */
355 av_packet_unref(out);
360 static void bsf_list_flush(AVBSFContext *bsf)
362 BSFListContext *lst = bsf->priv_data;
364 for (int i = 0; i < lst->nb_bsfs; i++)
365 av_bsf_flush(lst->bsfs[i]);
366 lst->idx = lst->flushed_idx = 0;
369 static void bsf_list_close(AVBSFContext *bsf)
371 BSFListContext *lst = bsf->priv_data;
374 for (i = 0; i < lst->nb_bsfs; ++i)
375 av_bsf_free(&lst->bsfs[i]);
376 av_freep(&lst->bsfs);
377 av_freep(&lst->item_name);
380 static const char *bsf_list_item_name(void *ctx)
382 static const char *null_filter_name = "null";
383 AVBSFContext *bsf_ctx = ctx;
384 BSFListContext *lst = bsf_ctx->priv_data;
387 return null_filter_name;
389 if (!lst->item_name) {
392 av_bprint_init(&bp, 16, 128);
394 av_bprintf(&bp, "bsf_list(");
395 for (i = 0; i < lst->nb_bsfs; i++)
396 av_bprintf(&bp, i ? ",%s" : "%s", lst->bsfs[i]->filter->name);
397 av_bprintf(&bp, ")");
399 av_bprint_finalize(&bp, &lst->item_name);
402 return lst->item_name;
405 static const AVClass bsf_list_class = {
406 .class_name = "bsf_list",
407 .item_name = bsf_list_item_name,
408 .version = LIBAVUTIL_VERSION_INT,
411 const AVBitStreamFilter ff_list_bsf = {
413 .priv_data_size = sizeof(BSFListContext),
414 .priv_class = &bsf_list_class,
415 .init = bsf_list_init,
416 .filter = bsf_list_filter,
417 .flush = bsf_list_flush,
418 .close = bsf_list_close,
426 AVBSFList *av_bsf_list_alloc(void)
428 return av_mallocz(sizeof(AVBSFList));
431 void av_bsf_list_free(AVBSFList **lst)
438 for (i = 0; i < (*lst)->nb_bsfs; ++i)
439 av_bsf_free(&(*lst)->bsfs[i]);
440 av_free((*lst)->bsfs);
444 int av_bsf_list_append(AVBSFList *lst, AVBSFContext *bsf)
446 return av_dynarray_add_nofree(&lst->bsfs, &lst->nb_bsfs, bsf);
449 int av_bsf_list_append2(AVBSFList *lst, const char *bsf_name, AVDictionary ** options)
452 const AVBitStreamFilter *filter;
455 filter = av_bsf_get_by_name(bsf_name);
457 return AVERROR_BSF_NOT_FOUND;
459 ret = av_bsf_alloc(filter, &bsf);
464 ret = av_opt_set_dict2(bsf, options, AV_OPT_SEARCH_CHILDREN);
469 ret = av_bsf_list_append(lst, bsf);
478 int av_bsf_list_finalize(AVBSFList **lst, AVBSFContext **bsf)
483 if ((*lst)->nb_bsfs == 1) {
484 *bsf = (*lst)->bsfs[0];
485 av_freep(&(*lst)->bsfs);
490 ret = av_bsf_alloc(&ff_list_bsf, bsf);
494 ctx = (*bsf)->priv_data;
496 ctx->bsfs = (*lst)->bsfs;
497 ctx->nb_bsfs = (*lst)->nb_bsfs;
504 static int bsf_parse_single(const char *str, AVBSFList *bsf_lst)
506 char *bsf_name, *bsf_options_str, *buf;
507 AVDictionary *bsf_options = NULL;
510 if (!(buf = av_strdup(str)))
511 return AVERROR(ENOMEM);
513 bsf_name = av_strtok(buf, "=", &bsf_options_str);
515 ret = AVERROR(EINVAL);
519 if (bsf_options_str) {
520 ret = av_dict_parse_string(&bsf_options, bsf_options_str, "=", ":", 0);
525 ret = av_bsf_list_append2(bsf_lst, bsf_name, &bsf_options);
528 av_dict_free(&bsf_options);
533 int av_bsf_list_parse_str(const char *str, AVBSFContext **bsf_lst)
536 char *bsf_str, *buf, *dup, *saveptr;
540 return av_bsf_get_null_filter(bsf_lst);
542 lst = av_bsf_list_alloc();
544 return AVERROR(ENOMEM);
546 if (!(dup = buf = av_strdup(str))) {
547 ret = AVERROR(ENOMEM);
552 bsf_str = av_strtok(buf, ",", &saveptr);
556 ret = bsf_parse_single(bsf_str, lst);
563 ret = av_bsf_list_finalize(&lst, bsf_lst);
566 av_bsf_list_free(&lst);
571 int av_bsf_get_null_filter(AVBSFContext **bsf)
573 return av_bsf_alloc(&ff_list_bsf, bsf);