3 * Copyright (c) 2012 Nicolas George
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public License
9 * as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with FFmpeg; if not, write to the Free Software * Foundation, Inc.,
19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #include "libavutil/avutil.h"
24 #include "libavutil/avstring.h"
25 #include "libavutil/opt.h"
28 #include "avio_internal.h"
34 AVBitStreamFilterContext **bsfs; ///< bitstream filters per stream
36 /** map from input to output streams indexes,
37 * disabled output streams are set to -1 */
41 typedef struct TeeContext {
44 TeeSlave slaves[MAX_SLAVES];
47 static const char *const slave_delim = "|";
48 static const char *const slave_opt_open = "[";
49 static const char *const slave_opt_close = "]";
50 static const char *const slave_opt_delim = ":]"; /* must have the close too */
51 static const char *const slave_bsfs_spec_sep = "/";
52 static const char *const slave_select_sep = ",";
54 static const AVClass tee_muxer_class = {
55 .class_name = "Tee muxer",
56 .item_name = av_default_item_name,
57 .version = LIBAVUTIL_VERSION_INT,
60 static int parse_slave_options(void *log, char *slave,
61 AVDictionary **options, char **filename)
67 if (!strspn(slave, slave_opt_open)) {
72 if (strspn(p, slave_opt_close)) {
73 *filename = (char *)p + 1;
77 ret = av_opt_get_key_value(&p, "=", slave_opt_delim, 0, &key, &val);
79 av_log(log, AV_LOG_ERROR, "No option found near \"%s\"\n", p);
82 ret = av_dict_set(options, key, val,
83 AV_DICT_DONT_STRDUP_KEY | AV_DICT_DONT_STRDUP_VAL);
86 if (strspn(p, slave_opt_close))
90 *filename = (char *)p + 1;
94 av_dict_free(options);
99 * Parse list of bitstream filters and add them to the list of filters
100 * pointed to by bsfs.
102 * The list must be specified in the form:
103 * BSFS ::= BSF[,BSFS]
105 static int parse_bsfs(void *log_ctx, const char *bsfs_spec,
106 AVBitStreamFilterContext **bsfs)
108 char *bsf_name, *buf, *dup, *saveptr;
111 if (!(dup = buf = av_strdup(bsfs_spec)))
112 return AVERROR(ENOMEM);
114 while (bsf_name = av_strtok(buf, ",", &saveptr)) {
115 AVBitStreamFilterContext *bsf = av_bitstream_filter_init(bsf_name);
118 av_log(log_ctx, AV_LOG_ERROR,
119 "Cannot initialize bitstream filter with name '%s', "
120 "unknown filter or internal error happened\n",
122 ret = AVERROR_UNKNOWN;
126 /* append bsf context to the list of bsf contexts */
138 static void close_slave(TeeSlave *tee_slave)
140 AVFormatContext *avf;
143 avf = tee_slave->avf;
144 for (i = 0; i < avf->nb_streams; ++i) {
145 AVBitStreamFilterContext *bsf_next, *bsf = tee_slave->bsfs[i];
147 bsf_next = bsf->next;
148 av_bitstream_filter_close(bsf);
152 av_freep(&tee_slave->stream_map);
153 av_freep(&tee_slave->bsfs);
155 ff_format_io_close(avf, &avf->pb);
156 avformat_free_context(avf);
157 tee_slave->avf = NULL;
160 static void close_slaves(AVFormatContext *avf)
162 TeeContext *tee = avf->priv_data;
165 for (i = 0; i < tee->nb_slaves; i++) {
166 close_slave(&tee->slaves[i]);
170 static int open_slave(AVFormatContext *avf, char *slave, TeeSlave *tee_slave)
173 AVDictionary *options = NULL;
174 AVDictionaryEntry *entry;
176 char *format = NULL, *select = NULL;
177 AVFormatContext *avf2 = NULL;
181 char *subselect = NULL, *next_subselect = NULL, *first_subselect = NULL, *tmp_select = NULL;
183 if ((ret = parse_slave_options(avf, slave, &options, &filename)) < 0)
186 #define STEAL_OPTION(option, field) do { \
187 if ((entry = av_dict_get(options, option, NULL, 0))) { \
188 field = entry->value; \
189 entry->value = NULL; /* prevent it from being freed */ \
190 av_dict_set(&options, option, NULL, 0); \
194 STEAL_OPTION("f", format);
195 STEAL_OPTION("select", select);
197 ret = avformat_alloc_output_context2(&avf2, NULL, format, filename);
200 av_dict_copy(&avf2->metadata, avf->metadata, 0);
201 avf2->opaque = avf->opaque;
202 avf2->io_open = avf->io_open;
203 avf2->io_close = avf->io_close;
205 tee_slave->stream_map = av_calloc(avf->nb_streams, sizeof(*tee_slave->stream_map));
206 if (!tee_slave->stream_map) {
207 ret = AVERROR(ENOMEM);
212 for (i = 0; i < avf->nb_streams; i++) {
213 st = avf->streams[i];
215 tmp_select = av_strdup(select); // av_strtok is destructive so we regenerate it in each loop
217 ret = AVERROR(ENOMEM);
221 first_subselect = tmp_select;
222 next_subselect = NULL;
223 while (subselect = av_strtok(first_subselect, slave_select_sep, &next_subselect)) {
224 first_subselect = NULL;
226 ret = avformat_match_stream_specifier(avf, avf->streams[i], subselect);
228 av_log(avf, AV_LOG_ERROR,
229 "Invalid stream specifier '%s' for output '%s'\n",
234 fullret = 1; // match
238 av_freep(&tmp_select);
240 if (fullret == 0) { /* no match */
241 tee_slave->stream_map[i] = -1;
245 tee_slave->stream_map[i] = stream_count++;
247 if (!(st2 = avformat_new_stream(avf2, NULL))) {
248 ret = AVERROR(ENOMEM);
252 st2->r_frame_rate = st->r_frame_rate;
253 st2->time_base = st->time_base;
254 st2->start_time = st->start_time;
255 st2->duration = st->duration;
256 st2->nb_frames = st->nb_frames;
257 st2->disposition = st->disposition;
258 st2->sample_aspect_ratio = st->sample_aspect_ratio;
259 st2->avg_frame_rate = st->avg_frame_rate;
260 av_dict_copy(&st2->metadata, st->metadata, 0);
261 if ((ret = avcodec_parameters_copy(st2->codecpar, st->codecpar)) < 0)
265 if (!(avf2->oformat->flags & AVFMT_NOFILE)) {
266 if ((ret = avf2->io_open(avf2, &avf2->pb, filename, AVIO_FLAG_WRITE, NULL)) < 0) {
267 av_log(avf, AV_LOG_ERROR, "Slave '%s': error opening: %s\n",
268 slave, av_err2str(ret));
273 if ((ret = avformat_write_header(avf2, &options)) < 0) {
274 av_log(avf, AV_LOG_ERROR, "Slave '%s': error writing header: %s\n",
275 slave, av_err2str(ret));
279 tee_slave->avf = avf2;
280 tee_slave->bsfs = av_calloc(avf2->nb_streams, sizeof(TeeSlave));
281 if (!tee_slave->bsfs) {
282 ret = AVERROR(ENOMEM);
287 while (entry = av_dict_get(options, "bsfs", NULL, AV_DICT_IGNORE_SUFFIX)) {
288 const char *spec = entry->key + strlen("bsfs");
290 if (strspn(spec, slave_bsfs_spec_sep) != 1) {
291 av_log(avf, AV_LOG_ERROR,
292 "Specifier separator in '%s' is '%c', but only characters '%s' "
293 "are allowed\n", entry->key, *spec, slave_bsfs_spec_sep);
294 return AVERROR(EINVAL);
296 spec++; /* consume separator */
299 for (i = 0; i < avf2->nb_streams; i++) {
300 ret = avformat_match_stream_specifier(avf2, avf2->streams[i], spec);
302 av_log(avf, AV_LOG_ERROR,
303 "Invalid stream specifier '%s' in bsfs option '%s' for slave "
304 "output '%s'\n", spec, entry->key, filename);
309 av_log(avf, AV_LOG_DEBUG, "spec:%s bsfs:%s matches stream %d of slave "
310 "output '%s'\n", spec, entry->value, i, filename);
311 if (tee_slave->bsfs[i]) {
312 av_log(avf, AV_LOG_WARNING,
313 "Duplicate bsfs specification associated to stream %d of slave "
314 "output '%s', filters will be ignored\n", i, filename);
317 ret = parse_bsfs(avf, entry->value, &tee_slave->bsfs[i]);
319 av_log(avf, AV_LOG_ERROR,
320 "Error parsing bitstream filter sequence '%s' associated to "
321 "stream %d of slave output '%s'\n", entry->value, i, filename);
327 av_dict_set(&options, entry->key, NULL, 0);
332 while ((entry = av_dict_get(options, "", entry, AV_DICT_IGNORE_SUFFIX)))
333 av_log(avf2, AV_LOG_ERROR, "Unknown option '%s'\n", entry->key);
334 ret = AVERROR_OPTION_NOT_FOUND;
341 av_dict_free(&options);
342 av_freep(&tmp_select);
346 static void log_slave(TeeSlave *slave, void *log_ctx, int log_level)
349 av_log(log_ctx, log_level, "filename:'%s' format:%s\n",
350 slave->avf->filename, slave->avf->oformat->name);
351 for (i = 0; i < slave->avf->nb_streams; i++) {
352 AVStream *st = slave->avf->streams[i];
353 AVBitStreamFilterContext *bsf = slave->bsfs[i];
355 av_log(log_ctx, log_level, " stream:%d codec:%s type:%s",
356 i, avcodec_get_name(st->codecpar->codec_id),
357 av_get_media_type_string(st->codecpar->codec_type));
359 av_log(log_ctx, log_level, " bsfs:");
361 av_log(log_ctx, log_level, "%s%s",
362 bsf->filter->name, bsf->next ? "," : "");
366 av_log(log_ctx, log_level, "\n");
370 static int tee_write_header(AVFormatContext *avf)
372 TeeContext *tee = avf->priv_data;
373 unsigned nb_slaves = 0, i;
374 const char *filename = avf->filename;
375 char *slaves[MAX_SLAVES];
379 if (nb_slaves == MAX_SLAVES) {
380 av_log(avf, AV_LOG_ERROR, "Maximum %d slave muxers reached.\n",
382 ret = AVERROR_PATCHWELCOME;
385 if (!(slaves[nb_slaves++] = av_get_token(&filename, slave_delim))) {
386 ret = AVERROR(ENOMEM);
389 if (strspn(filename, slave_delim))
393 for (i = 0; i < nb_slaves; i++) {
394 if ((ret = open_slave(avf, slaves[i], &tee->slaves[i])) < 0)
396 log_slave(&tee->slaves[i], avf, AV_LOG_VERBOSE);
397 av_freep(&slaves[i]);
400 tee->nb_slaves = nb_slaves;
402 for (i = 0; i < avf->nb_streams; i++) {
404 for (j = 0; j < tee->nb_slaves; j++)
405 mapped += tee->slaves[j].stream_map[i] >= 0;
407 av_log(avf, AV_LOG_WARNING, "Input stream #%d is not mapped "
408 "to any slave.\n", i);
413 for (i = 0; i < nb_slaves; i++)
414 av_freep(&slaves[i]);
419 static int tee_write_trailer(AVFormatContext *avf)
421 TeeContext *tee = avf->priv_data;
422 AVFormatContext *avf2;
423 int ret_all = 0, ret;
426 for (i = 0; i < tee->nb_slaves; i++) {
427 avf2 = tee->slaves[i].avf;
428 if ((ret = av_write_trailer(avf2)) < 0)
431 if (!(avf2->oformat->flags & AVFMT_NOFILE))
432 ff_format_io_close(avf2, &avf2->pb);
438 static int tee_write_packet(AVFormatContext *avf, AVPacket *pkt)
440 TeeContext *tee = avf->priv_data;
441 AVFormatContext *avf2;
443 int ret_all = 0, ret;
448 for (i = 0; i < tee->nb_slaves; i++) {
449 avf2 = tee->slaves[i].avf;
450 s = pkt->stream_index;
451 s2 = tee->slaves[i].stream_map[s];
455 if ((ret = av_copy_packet(&pkt2, pkt)) < 0 ||
456 (ret = av_dup_packet(&pkt2))< 0)
461 tb = avf ->streams[s ]->time_base;
462 tb2 = avf2->streams[s2]->time_base;
463 pkt2.pts = av_rescale_q(pkt->pts, tb, tb2);
464 pkt2.dts = av_rescale_q(pkt->dts, tb, tb2);
465 pkt2.duration = av_rescale_q(pkt->duration, tb, tb2);
466 pkt2.stream_index = s2;
468 if ((ret = av_apply_bitstream_filters(avf2->streams[s2]->codec, &pkt2,
469 tee->slaves[i].bsfs[s2])) < 0 ||
470 (ret = av_interleaved_write_frame(avf2, &pkt2)) < 0)
477 AVOutputFormat ff_tee_muxer = {
479 .long_name = NULL_IF_CONFIG_SMALL("Multiple muxer tee"),
480 .priv_data_size = sizeof(TeeContext),
481 .write_header = tee_write_header,
482 .write_trailer = tee_write_trailer,
483 .write_packet = tee_write_packet,
484 .priv_class = &tee_muxer_class,
485 .flags = AVFMT_NOFILE,