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 int av_bsf_send_packet(AVBSFContext *ctx, AVPacket *pkt)
177 if (!pkt || (!pkt->data && !pkt->side_data_elems)) {
178 ctx->internal->eof = 1;
182 if (ctx->internal->eof) {
183 av_log(ctx, AV_LOG_ERROR, "A non-NULL packet sent after an EOF.\n");
184 return AVERROR(EINVAL);
187 if (ctx->internal->buffer_pkt->data ||
188 ctx->internal->buffer_pkt->side_data_elems)
189 return AVERROR(EAGAIN);
192 av_packet_move_ref(ctx->internal->buffer_pkt, pkt);
194 int ret = av_packet_ref(ctx->internal->buffer_pkt, pkt);
198 av_packet_unref(pkt);
204 int av_bsf_receive_packet(AVBSFContext *ctx, AVPacket *pkt)
206 return ctx->filter->filter(ctx, pkt);
209 int ff_bsf_get_packet(AVBSFContext *ctx, AVPacket **pkt)
211 AVBSFInternal *in = ctx->internal;
217 if (!ctx->internal->buffer_pkt->data &&
218 !ctx->internal->buffer_pkt->side_data_elems)
219 return AVERROR(EAGAIN);
221 tmp_pkt = av_packet_alloc();
223 return AVERROR(ENOMEM);
225 *pkt = ctx->internal->buffer_pkt;
226 ctx->internal->buffer_pkt = tmp_pkt;
231 int ff_bsf_get_packet_ref(AVBSFContext *ctx, AVPacket *pkt)
233 AVBSFInternal *in = ctx->internal;
238 if (!ctx->internal->buffer_pkt->data &&
239 !ctx->internal->buffer_pkt->side_data_elems)
240 return AVERROR(EAGAIN);
242 av_packet_move_ref(pkt, ctx->internal->buffer_pkt);
247 typedef struct BSFListContext {
248 const AVClass *class;
253 unsigned idx; // index of currently processed BSF
254 unsigned flushed_idx; // index of BSF being flushed
260 static int bsf_list_init(AVBSFContext *bsf)
262 BSFListContext *lst = bsf->priv_data;
264 const AVCodecParameters *cod_par = bsf->par_in;
265 AVRational tb = bsf->time_base_in;
267 for (i = 0; i < lst->nb_bsfs; ++i) {
268 ret = avcodec_parameters_copy(lst->bsfs[i]->par_in, cod_par);
272 lst->bsfs[i]->time_base_in = tb;
274 ret = av_bsf_init(lst->bsfs[i]);
278 cod_par = lst->bsfs[i]->par_out;
279 tb = lst->bsfs[i]->time_base_out;
282 bsf->time_base_out = tb;
283 ret = avcodec_parameters_copy(bsf->par_out, cod_par);
289 static int bsf_list_filter(AVBSFContext *bsf, AVPacket *out)
291 BSFListContext *lst = bsf->priv_data;
295 return ff_bsf_get_packet_ref(bsf, out);
298 if (lst->idx > lst->flushed_idx) {
299 ret = av_bsf_receive_packet(lst->bsfs[lst->idx-1], out);
300 if (ret == AVERROR(EAGAIN)) {
301 /* no more packets from idx-1, try with previous */
305 } else if (ret == AVERROR_EOF) {
306 /* filter idx-1 is done, continue with idx...nb_bsfs */
307 lst->flushed_idx = lst->idx;
310 /* filtering error */
314 ret = ff_bsf_get_packet_ref(bsf, out);
315 if (ret == AVERROR_EOF) {
316 lst->idx = lst->flushed_idx;
321 if (lst->idx < lst->nb_bsfs) {
323 if (ret == AVERROR_EOF && lst->idx == lst->flushed_idx) {
324 /* ff_bsf_get_packet_ref returned EOF and idx is first
325 * filter of yet not flushed filter chain */
330 ret = av_bsf_send_packet(lst->bsfs[lst->idx], pkt);
335 /* The end of filter chain, break to return result */
341 av_packet_unref(out);
346 static void bsf_list_close(AVBSFContext *bsf)
348 BSFListContext *lst = bsf->priv_data;
351 for (i = 0; i < lst->nb_bsfs; ++i)
352 av_bsf_free(&lst->bsfs[i]);
353 av_freep(&lst->bsfs);
354 av_freep(&lst->item_name);
357 static const char *bsf_list_item_name(void *ctx)
359 static const char *null_filter_name = "null";
360 AVBSFContext *bsf_ctx = ctx;
361 BSFListContext *lst = bsf_ctx->priv_data;
364 return null_filter_name;
366 if (!lst->item_name) {
369 av_bprint_init(&bp, 16, 128);
371 av_bprintf(&bp, "bsf_list(");
372 for (i = 0; i < lst->nb_bsfs; i++)
373 av_bprintf(&bp, i ? ",%s" : "%s", lst->bsfs[i]->filter->name);
374 av_bprintf(&bp, ")");
376 av_bprint_finalize(&bp, &lst->item_name);
379 return lst->item_name;
382 static const AVClass bsf_list_class = {
383 .class_name = "bsf_list",
384 .item_name = bsf_list_item_name,
385 .version = LIBAVUTIL_VERSION_INT,
388 const AVBitStreamFilter ff_list_bsf = {
390 .priv_data_size = sizeof(BSFListContext),
391 .priv_class = &bsf_list_class,
392 .init = bsf_list_init,
393 .filter = bsf_list_filter,
394 .close = bsf_list_close,
402 AVBSFList *av_bsf_list_alloc(void)
404 return av_mallocz(sizeof(AVBSFList));
407 void av_bsf_list_free(AVBSFList **lst)
414 for (i = 0; i < (*lst)->nb_bsfs; ++i)
415 av_bsf_free(&(*lst)->bsfs[i]);
416 av_free((*lst)->bsfs);
420 int av_bsf_list_append(AVBSFList *lst, AVBSFContext *bsf)
422 return av_dynarray_add_nofree(&lst->bsfs, &lst->nb_bsfs, bsf);
425 int av_bsf_list_append2(AVBSFList *lst, const char *bsf_name, AVDictionary ** options)
428 const AVBitStreamFilter *filter;
431 filter = av_bsf_get_by_name(bsf_name);
433 return AVERROR_BSF_NOT_FOUND;
435 ret = av_bsf_alloc(filter, &bsf);
440 ret = av_opt_set_dict2(bsf, options, AV_OPT_SEARCH_CHILDREN);
445 ret = av_bsf_list_append(lst, bsf);
454 int av_bsf_list_finalize(AVBSFList **lst, AVBSFContext **bsf)
459 if ((*lst)->nb_bsfs == 1) {
460 *bsf = (*lst)->bsfs[0];
461 av_freep(&(*lst)->bsfs);
466 ret = av_bsf_alloc(&ff_list_bsf, bsf);
470 ctx = (*bsf)->priv_data;
472 ctx->bsfs = (*lst)->bsfs;
473 ctx->nb_bsfs = (*lst)->nb_bsfs;
480 static int bsf_parse_single(const char *str, AVBSFList *bsf_lst)
482 char *bsf_name, *bsf_options_str, *buf;
483 AVDictionary *bsf_options = NULL;
486 if (!(buf = av_strdup(str)))
487 return AVERROR(ENOMEM);
489 bsf_name = av_strtok(buf, "=", &bsf_options_str);
491 ret = AVERROR(EINVAL);
495 if (bsf_options_str) {
496 ret = av_dict_parse_string(&bsf_options, bsf_options_str, "=", ":", 0);
501 ret = av_bsf_list_append2(bsf_lst, bsf_name, &bsf_options);
503 av_dict_free(&bsf_options);
509 int av_bsf_list_parse_str(const char *str, AVBSFContext **bsf_lst)
512 char *bsf_str, *buf, *dup, *saveptr;
516 return av_bsf_get_null_filter(bsf_lst);
518 lst = av_bsf_list_alloc();
520 return AVERROR(ENOMEM);
522 if (!(dup = buf = av_strdup(str))) {
523 ret = AVERROR(ENOMEM);
528 bsf_str = av_strtok(buf, ",", &saveptr);
532 ret = bsf_parse_single(bsf_str, lst);
539 ret = av_bsf_list_finalize(&lst, bsf_lst);
542 av_bsf_list_free(&lst);
547 int av_bsf_get_null_filter(AVBSFContext **bsf)
549 return av_bsf_alloc(&ff_list_bsf, bsf);