mirror of
https://git.ffmpeg.org/ffmpeg.git
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279 lines
8.0 KiB
C
279 lines
8.0 KiB
C
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/*
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* Tee pesudo-muxer
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* Copyright (c) 2012 Nicolas George
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with FFmpeg; if not, write to the Free Software * Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/avutil.h"
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#include "libavutil/avstring.h"
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#include "libavutil/opt.h"
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#include "avformat.h"
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#define MAX_SLAVES 16
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typedef struct TeeContext {
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const AVClass *class;
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unsigned nb_slaves;
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AVFormatContext *slaves[MAX_SLAVES];
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} TeeContext;
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static const char *const slave_delim = "|";
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static const char *const slave_opt_open = "[";
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static const char *const slave_opt_close = "]";
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static const char *const slave_opt_delim = ":]"; /* must have the close too */
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static const AVClass tee_muxer_class = {
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.class_name = "Tee muxer",
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.item_name = av_default_item_name,
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.version = LIBAVUTIL_VERSION_INT,
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};
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static int parse_slave_options(void *log, char *slave,
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AVDictionary **options, char **filename)
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{
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const char *p;
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char *key, *val;
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int ret;
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if (!strspn(slave, slave_opt_open)) {
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*filename = slave;
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return 0;
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}
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p = slave + 1;
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if (strspn(p, slave_opt_close)) {
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*filename = (char *)p + 1;
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return 0;
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}
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while (1) {
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ret = av_opt_get_key_value(&p, "=", slave_opt_delim, 0, &key, &val);
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if (ret < 0) {
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av_log(log, AV_LOG_ERROR, "No option found near \"%s\"\n", p);
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goto fail;
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}
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ret = av_dict_set(options, key, val,
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AV_DICT_DONT_STRDUP_KEY | AV_DICT_DONT_STRDUP_VAL);
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if (ret < 0)
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goto fail;
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if (strspn(p, slave_opt_close))
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break;
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p++;
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}
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*filename = (char *)p + 1;
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return 0;
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fail:
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av_dict_free(options);
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return ret;
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}
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static int open_slave(AVFormatContext *avf, char *slave, AVFormatContext **ravf)
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{
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int i, ret;
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AVDictionary *options = NULL;
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AVDictionaryEntry *entry;
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char *filename;
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char *format = NULL;
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AVFormatContext *avf2 = NULL;
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AVStream *st, *st2;
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if ((ret = parse_slave_options(avf, slave, &options, &filename)) < 0)
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return ret;
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if ((entry = av_dict_get(options, "f", NULL, 0))) {
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format = entry->value;
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entry->value = NULL; /* prevent it from being freed */
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av_dict_set(&options, "f", NULL, 0);
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}
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avformat_alloc_output_context2(&avf2, NULL, format, filename);
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if (ret < 0)
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goto fail;
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av_free(format);
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for (i = 0; i < avf->nb_streams; i++) {
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st = avf->streams[i];
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if (!(st2 = avformat_new_stream(avf2, NULL))) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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st2->id = st->id;
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st2->r_frame_rate = st->r_frame_rate;
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st2->time_base = st->time_base;
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st2->start_time = st->start_time;
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st2->duration = st->duration;
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st2->nb_frames = st->nb_frames;
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st2->disposition = st->disposition;
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st2->sample_aspect_ratio = st->sample_aspect_ratio;
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st2->avg_frame_rate = st->avg_frame_rate;
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av_dict_copy(&st2->metadata, st->metadata, 0);
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if ((ret = avcodec_copy_context(st2->codec, st->codec)) < 0)
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goto fail;
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}
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if (!(avf2->oformat->flags & AVFMT_NOFILE)) {
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if ((ret = avio_open(&avf2->pb, filename, AVIO_FLAG_WRITE)) < 0) {
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av_log(avf, AV_LOG_ERROR, "Slave '%s': error opening: %s\n",
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slave, av_err2str(ret));
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goto fail;
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}
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}
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if ((ret = avformat_write_header(avf2, &options)) < 0) {
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av_log(avf, AV_LOG_ERROR, "Slave '%s': error writing header: %s\n",
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slave, av_err2str(ret));
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goto fail;
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}
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if (options) {
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entry = NULL;
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while ((entry = av_dict_get(options, "", entry, AV_DICT_IGNORE_SUFFIX)))
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av_log(avf2, AV_LOG_ERROR, "Unknown option '%s'\n", entry->key);
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ret = AVERROR_OPTION_NOT_FOUND;
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goto fail;
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}
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*ravf = avf2;
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return 0;
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fail:
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av_dict_free(&options);
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return ret;
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}
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static void close_slaves(AVFormatContext *avf)
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{
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TeeContext *tee = avf->priv_data;
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AVFormatContext *avf2;
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unsigned i;
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for (i = 0; i < tee->nb_slaves; i++) {
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avf2 = tee->slaves[i];
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avio_close(avf2->pb);
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avf2->pb = NULL;
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avformat_free_context(avf2);
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tee->slaves[i] = NULL;
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}
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}
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static int tee_write_header(AVFormatContext *avf)
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{
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TeeContext *tee = avf->priv_data;
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unsigned nb_slaves = 0, i;
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const char *filename = avf->filename;
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char *slaves[MAX_SLAVES];
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int ret;
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while (*filename) {
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if (nb_slaves == MAX_SLAVES) {
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av_log(avf, AV_LOG_ERROR, "Maximum %d slave muxers reached.\n",
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MAX_SLAVES);
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ret = AVERROR_PATCHWELCOME;
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goto fail;
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}
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if (!(slaves[nb_slaves++] = av_get_token(&filename, slave_delim))) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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if (strspn(filename, slave_delim))
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filename++;
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}
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for (i = 0; i < nb_slaves; i++) {
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if ((ret = open_slave(avf, slaves[i], &tee->slaves[i])) < 0)
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goto fail;
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av_freep(&slaves[i]);
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}
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tee->nb_slaves = nb_slaves;
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return 0;
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fail:
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for (i = 0; i < nb_slaves; i++)
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av_freep(&slaves[i]);
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close_slaves(avf);
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return ret;
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}
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static int tee_write_trailer(AVFormatContext *avf)
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{
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TeeContext *tee = avf->priv_data;
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AVFormatContext *avf2;
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int ret_all = 0, ret;
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unsigned i;
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for (i = 0; i < tee->nb_slaves; i++) {
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avf2 = tee->slaves[i];
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if ((ret = av_write_trailer(avf2)) < 0)
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if (!ret_all)
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ret_all = ret;
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if (!(avf2->oformat->flags & AVFMT_NOFILE)) {
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if ((ret = avio_close(avf2->pb)) < 0)
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if (!ret_all)
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ret_all = ret;
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avf2->pb = NULL;
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}
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}
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close_slaves(avf);
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return ret_all;
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}
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static int tee_write_packet(AVFormatContext *avf, AVPacket *pkt)
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{
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TeeContext *tee = avf->priv_data;
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AVFormatContext *avf2;
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AVPacket pkt2;
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int ret_all = 0, ret;
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unsigned i, s;
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AVRational tb, tb2;
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for (i = 0; i < tee->nb_slaves; i++) {
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avf2 = tee->slaves[i];
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s = pkt->stream_index;
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if (s >= avf2->nb_streams) {
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if (!ret_all)
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ret_all = AVERROR(EINVAL);
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continue;
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}
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if ((ret = av_copy_packet(&pkt2, pkt)) < 0 ||
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(ret = av_dup_packet(&pkt2))< 0)
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if (!ret_all) {
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ret = ret_all;
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continue;
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}
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tb = avf ->streams[s]->time_base;
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tb2 = avf2->streams[s]->time_base;
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pkt2.pts = av_rescale_q(pkt->pts, tb, tb2);
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pkt2.dts = av_rescale_q(pkt->dts, tb, tb2);
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pkt2.duration = av_rescale_q(pkt->duration, tb, tb2);
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if ((ret = av_interleaved_write_frame(avf2, &pkt2)) < 0)
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if (!ret_all)
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ret_all = ret;
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}
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return ret_all;
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}
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AVOutputFormat ff_tee_muxer = {
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.name = "tee",
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.long_name = NULL_IF_CONFIG_SMALL("Multiple muxer tee"),
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.priv_data_size = sizeof(TeeContext),
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.write_header = tee_write_header,
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.write_trailer = tee_write_trailer,
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.write_packet = tee_write_packet,
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.priv_class = &tee_muxer_class,
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.flags = AVFMT_NOFILE,
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};
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