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);
50 av_packet_free(&ctx->internal->buffer_pkt);
51 av_freep(&ctx->internal);
52 av_freep(&ctx->priv_data);
54 avcodec_parameters_free(&ctx->par_in);
55 avcodec_parameters_free(&ctx->par_out);
60 static void *bsf_child_next(void *obj, void *prev)
62 AVBSFContext *ctx = obj;
63 if (!prev && ctx->filter->priv_class)
64 return ctx->priv_data;
68 static const AVClass bsf_class = {
69 .class_name = "AVBSFContext",
70 .item_name = av_default_item_name,
71 .version = LIBAVUTIL_VERSION_INT,
72 .child_next = bsf_child_next,
73 .child_class_next = ff_bsf_child_class_next,
76 const AVClass *av_bsf_get_class(void)
81 int av_bsf_alloc(const AVBitStreamFilter *filter, AVBSFContext **pctx)
86 ctx = av_mallocz(sizeof(*ctx));
88 return AVERROR(ENOMEM);
90 ctx->av_class = &bsf_class;
93 ctx->par_in = avcodec_parameters_alloc();
94 ctx->par_out = avcodec_parameters_alloc();
95 if (!ctx->par_in || !ctx->par_out) {
96 ret = AVERROR(ENOMEM);
100 ctx->internal = av_mallocz(sizeof(*ctx->internal));
101 if (!ctx->internal) {
102 ret = AVERROR(ENOMEM);
106 ctx->internal->buffer_pkt = av_packet_alloc();
107 if (!ctx->internal->buffer_pkt) {
108 ret = AVERROR(ENOMEM);
112 av_opt_set_defaults(ctx);
114 /* allocate priv data and init private options */
115 if (filter->priv_data_size) {
116 ctx->priv_data = av_mallocz(filter->priv_data_size);
117 if (!ctx->priv_data) {
118 ret = AVERROR(ENOMEM);
121 if (filter->priv_class) {
122 *(const AVClass **)ctx->priv_data = filter->priv_class;
123 av_opt_set_defaults(ctx->priv_data);
134 int av_bsf_init(AVBSFContext *ctx)
138 /* check that the codec is supported */
139 if (ctx->filter->codec_ids) {
140 for (i = 0; ctx->filter->codec_ids[i] != AV_CODEC_ID_NONE; i++)
141 if (ctx->par_in->codec_id == ctx->filter->codec_ids[i])
143 if (ctx->filter->codec_ids[i] == AV_CODEC_ID_NONE) {
144 const AVCodecDescriptor *desc = avcodec_descriptor_get(ctx->par_in->codec_id);
145 av_log(ctx, AV_LOG_ERROR, "Codec '%s' (%d) is not supported by the "
146 "bitstream filter '%s'. Supported codecs are: ",
147 desc ? desc->name : "unknown", ctx->par_in->codec_id, ctx->filter->name);
148 for (i = 0; ctx->filter->codec_ids[i] != AV_CODEC_ID_NONE; i++) {
149 desc = avcodec_descriptor_get(ctx->filter->codec_ids[i]);
150 av_log(ctx, AV_LOG_ERROR, "%s (%d) ",
151 desc ? desc->name : "unknown", ctx->filter->codec_ids[i]);
153 av_log(ctx, AV_LOG_ERROR, "\n");
154 return AVERROR(EINVAL);
158 /* initialize output parameters to be the same as input
159 * init below might overwrite that */
160 ret = avcodec_parameters_copy(ctx->par_out, ctx->par_in);
164 ctx->time_base_out = ctx->time_base_in;
166 if (ctx->filter->init) {
167 ret = ctx->filter->init(ctx);
175 void av_bsf_flush(AVBSFContext *ctx)
177 ctx->internal->eof = 0;
179 av_packet_unref(ctx->internal->buffer_pkt);
181 if (ctx->filter->flush)
182 ctx->filter->flush(ctx);
185 int av_bsf_send_packet(AVBSFContext *ctx, AVPacket *pkt)
189 if (!pkt || (!pkt->data && !pkt->side_data_elems)) {
190 ctx->internal->eof = 1;
194 if (ctx->internal->eof) {
195 av_log(ctx, AV_LOG_ERROR, "A non-NULL packet sent after an EOF.\n");
196 return AVERROR(EINVAL);
199 if (ctx->internal->buffer_pkt->data ||
200 ctx->internal->buffer_pkt->side_data_elems)
201 return AVERROR(EAGAIN);
203 ret = av_packet_make_refcounted(pkt);
206 av_packet_move_ref(ctx->internal->buffer_pkt, pkt);
211 int av_bsf_receive_packet(AVBSFContext *ctx, AVPacket *pkt)
213 return ctx->filter->filter(ctx, pkt);
216 int ff_bsf_get_packet(AVBSFContext *ctx, AVPacket **pkt)
218 AVBSFInternal *in = ctx->internal;
224 if (!ctx->internal->buffer_pkt->data &&
225 !ctx->internal->buffer_pkt->side_data_elems)
226 return AVERROR(EAGAIN);
228 tmp_pkt = av_packet_alloc();
230 return AVERROR(ENOMEM);
232 *pkt = ctx->internal->buffer_pkt;
233 ctx->internal->buffer_pkt = tmp_pkt;
238 int ff_bsf_get_packet_ref(AVBSFContext *ctx, AVPacket *pkt)
240 AVBSFInternal *in = ctx->internal;
245 if (!ctx->internal->buffer_pkt->data &&
246 !ctx->internal->buffer_pkt->side_data_elems)
247 return AVERROR(EAGAIN);
249 av_packet_move_ref(pkt, ctx->internal->buffer_pkt);
254 typedef struct BSFListContext {
255 const AVClass *class;
260 unsigned idx; // index of currently processed BSF
261 unsigned flushed_idx; // index of BSF being flushed
267 static int bsf_list_init(AVBSFContext *bsf)
269 BSFListContext *lst = bsf->priv_data;
271 const AVCodecParameters *cod_par = bsf->par_in;
272 AVRational tb = bsf->time_base_in;
274 for (i = 0; i < lst->nb_bsfs; ++i) {
275 ret = avcodec_parameters_copy(lst->bsfs[i]->par_in, cod_par);
279 lst->bsfs[i]->time_base_in = tb;
281 ret = av_bsf_init(lst->bsfs[i]);
285 cod_par = lst->bsfs[i]->par_out;
286 tb = lst->bsfs[i]->time_base_out;
289 bsf->time_base_out = tb;
290 ret = avcodec_parameters_copy(bsf->par_out, cod_par);
296 static int bsf_list_filter(AVBSFContext *bsf, AVPacket *out)
298 BSFListContext *lst = bsf->priv_data;
302 return ff_bsf_get_packet_ref(bsf, out);
305 if (lst->idx > lst->flushed_idx) {
306 ret = av_bsf_receive_packet(lst->bsfs[lst->idx-1], out);
307 if (ret == AVERROR(EAGAIN)) {
308 /* no more packets from idx-1, try with previous */
312 } else if (ret == AVERROR_EOF) {
313 /* filter idx-1 is done, continue with idx...nb_bsfs */
314 lst->flushed_idx = lst->idx;
317 /* filtering error */
321 ret = ff_bsf_get_packet_ref(bsf, out);
322 if (ret == AVERROR_EOF) {
323 lst->idx = lst->flushed_idx;
328 if (lst->idx < lst->nb_bsfs) {
330 if (ret == AVERROR_EOF && lst->idx == lst->flushed_idx) {
331 /* ff_bsf_get_packet_ref returned EOF and idx is first
332 * filter of yet not flushed filter chain */
337 ret = av_bsf_send_packet(lst->bsfs[lst->idx], pkt);
342 /* The end of filter chain, break to return result */
348 av_packet_unref(out);
353 static void bsf_list_close(AVBSFContext *bsf)
355 BSFListContext *lst = bsf->priv_data;
358 for (i = 0; i < lst->nb_bsfs; ++i)
359 av_bsf_free(&lst->bsfs[i]);
360 av_freep(&lst->bsfs);
361 av_freep(&lst->item_name);
364 static const char *bsf_list_item_name(void *ctx)
366 static const char *null_filter_name = "null";
367 AVBSFContext *bsf_ctx = ctx;
368 BSFListContext *lst = bsf_ctx->priv_data;
371 return null_filter_name;
373 if (!lst->item_name) {
376 av_bprint_init(&bp, 16, 128);
378 av_bprintf(&bp, "bsf_list(");
379 for (i = 0; i < lst->nb_bsfs; i++)
380 av_bprintf(&bp, i ? ",%s" : "%s", lst->bsfs[i]->filter->name);
381 av_bprintf(&bp, ")");
383 av_bprint_finalize(&bp, &lst->item_name);
386 return lst->item_name;
389 static const AVClass bsf_list_class = {
390 .class_name = "bsf_list",
391 .item_name = bsf_list_item_name,
392 .version = LIBAVUTIL_VERSION_INT,
395 const AVBitStreamFilter ff_list_bsf = {
397 .priv_data_size = sizeof(BSFListContext),
398 .priv_class = &bsf_list_class,
399 .init = bsf_list_init,
400 .filter = bsf_list_filter,
401 .close = bsf_list_close,
409 AVBSFList *av_bsf_list_alloc(void)
411 return av_mallocz(sizeof(AVBSFList));
414 void av_bsf_list_free(AVBSFList **lst)
421 for (i = 0; i < (*lst)->nb_bsfs; ++i)
422 av_bsf_free(&(*lst)->bsfs[i]);
423 av_free((*lst)->bsfs);
427 int av_bsf_list_append(AVBSFList *lst, AVBSFContext *bsf)
429 return av_dynarray_add_nofree(&lst->bsfs, &lst->nb_bsfs, bsf);
432 int av_bsf_list_append2(AVBSFList *lst, const char *bsf_name, AVDictionary ** options)
435 const AVBitStreamFilter *filter;
438 filter = av_bsf_get_by_name(bsf_name);
440 return AVERROR_BSF_NOT_FOUND;
442 ret = av_bsf_alloc(filter, &bsf);
447 ret = av_opt_set_dict2(bsf, options, AV_OPT_SEARCH_CHILDREN);
452 ret = av_bsf_list_append(lst, bsf);
461 int av_bsf_list_finalize(AVBSFList **lst, AVBSFContext **bsf)
466 if ((*lst)->nb_bsfs == 1) {
467 *bsf = (*lst)->bsfs[0];
468 av_freep(&(*lst)->bsfs);
473 ret = av_bsf_alloc(&ff_list_bsf, bsf);
477 ctx = (*bsf)->priv_data;
479 ctx->bsfs = (*lst)->bsfs;
480 ctx->nb_bsfs = (*lst)->nb_bsfs;
487 static int bsf_parse_single(const char *str, AVBSFList *bsf_lst)
489 char *bsf_name, *bsf_options_str, *buf;
490 AVDictionary *bsf_options = NULL;
493 if (!(buf = av_strdup(str)))
494 return AVERROR(ENOMEM);
496 bsf_name = av_strtok(buf, "=", &bsf_options_str);
498 ret = AVERROR(EINVAL);
502 if (bsf_options_str) {
503 ret = av_dict_parse_string(&bsf_options, bsf_options_str, "=", ":", 0);
508 ret = av_bsf_list_append2(bsf_lst, bsf_name, &bsf_options);
510 av_dict_free(&bsf_options);
516 int av_bsf_list_parse_str(const char *str, AVBSFContext **bsf_lst)
519 char *bsf_str, *buf, *dup, *saveptr;
523 return av_bsf_get_null_filter(bsf_lst);
525 lst = av_bsf_list_alloc();
527 return AVERROR(ENOMEM);
529 if (!(dup = buf = av_strdup(str))) {
530 ret = AVERROR(ENOMEM);
535 bsf_str = av_strtok(buf, ",", &saveptr);
539 ret = bsf_parse_single(bsf_str, lst);
546 ret = av_bsf_list_finalize(&lst, bsf_lst);
549 av_bsf_list_free(&lst);
554 int av_bsf_get_null_filter(AVBSFContext **bsf)
556 return av_bsf_alloc(&ff_list_bsf, bsf);