yading@11: /*
yading@11:  * Tee pesudo-muxer
yading@11:  * Copyright (c) 2012 Nicolas George
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public License
yading@11:  * as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
yading@11:  * GNU Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public License
yading@11:  * along with FFmpeg; if not, write to the Free Software * Foundation, Inc.,
yading@11:  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: 
yading@11: #include "libavutil/avutil.h"
yading@11: #include "libavutil/avstring.h"
yading@11: #include "libavutil/opt.h"
yading@11: #include "avformat.h"
yading@11: 
yading@11: #define MAX_SLAVES 16
yading@11: 
yading@11: typedef struct TeeContext {
yading@11:     const AVClass *class;
yading@11:     unsigned nb_slaves;
yading@11:     AVFormatContext *slaves[MAX_SLAVES];
yading@11: } TeeContext;
yading@11: 
yading@11: static const char *const slave_delim     = "|";
yading@11: static const char *const slave_opt_open  = "[";
yading@11: static const char *const slave_opt_close = "]";
yading@11: static const char *const slave_opt_delim = ":]"; /* must have the close too */
yading@11: 
yading@11: static const AVClass tee_muxer_class = {
yading@11:     .class_name = "Tee muxer",
yading@11:     .item_name  = av_default_item_name,
yading@11:     .version    = LIBAVUTIL_VERSION_INT,
yading@11: };
yading@11: 
yading@11: static int parse_slave_options(void *log, char *slave,
yading@11:                                AVDictionary **options, char **filename)
yading@11: {
yading@11:     const char *p;
yading@11:     char *key, *val;
yading@11:     int ret;
yading@11: 
yading@11:     if (!strspn(slave, slave_opt_open)) {
yading@11:         *filename = slave;
yading@11:         return 0;
yading@11:     }
yading@11:     p = slave + 1;
yading@11:     if (strspn(p, slave_opt_close)) {
yading@11:         *filename = (char *)p + 1;
yading@11:         return 0;
yading@11:     }
yading@11:     while (1) {
yading@11:         ret = av_opt_get_key_value(&p, "=", slave_opt_delim, 0, &key, &val);
yading@11:         if (ret < 0) {
yading@11:             av_log(log, AV_LOG_ERROR, "No option found near \"%s\"\n", p);
yading@11:             goto fail;
yading@11:         }
yading@11:         ret = av_dict_set(options, key, val,
yading@11:                           AV_DICT_DONT_STRDUP_KEY | AV_DICT_DONT_STRDUP_VAL);
yading@11:         if (ret < 0)
yading@11:             goto fail;
yading@11:         if (strspn(p, slave_opt_close))
yading@11:             break;
yading@11:         p++;
yading@11:     }
yading@11:     *filename = (char *)p + 1;
yading@11:     return 0;
yading@11: 
yading@11: fail:
yading@11:     av_dict_free(options);
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: static int open_slave(AVFormatContext *avf, char *slave, AVFormatContext **ravf)
yading@11: {
yading@11:     int i, ret;
yading@11:     AVDictionary *options = NULL;
yading@11:     AVDictionaryEntry *entry;
yading@11:     char *filename;
yading@11:     char *format = NULL;
yading@11:     AVFormatContext *avf2 = NULL;
yading@11:     AVStream *st, *st2;
yading@11: 
yading@11:     if ((ret = parse_slave_options(avf, slave, &options, &filename)) < 0)
yading@11:         return ret;
yading@11:     if ((entry = av_dict_get(options, "f", NULL, 0))) {
yading@11:         format = entry->value;
yading@11:         entry->value = NULL; /* prevent it from being freed */
yading@11:         av_dict_set(&options, "f", NULL, 0);
yading@11:     }
yading@11: 
yading@11:     ret = avformat_alloc_output_context2(&avf2, NULL, format, filename);
yading@11:     if (ret < 0)
yading@11:         goto fail;
yading@11:     av_free(format);
yading@11: 
yading@11:     for (i = 0; i < avf->nb_streams; i++) {
yading@11:         st = avf->streams[i];
yading@11:         if (!(st2 = avformat_new_stream(avf2, NULL))) {
yading@11:             ret = AVERROR(ENOMEM);
yading@11:             goto fail;
yading@11:         }
yading@11:         st2->id = st->id;
yading@11:         st2->r_frame_rate        = st->r_frame_rate;
yading@11:         st2->time_base           = st->time_base;
yading@11:         st2->start_time          = st->start_time;
yading@11:         st2->duration            = st->duration;
yading@11:         st2->nb_frames           = st->nb_frames;
yading@11:         st2->disposition         = st->disposition;
yading@11:         st2->sample_aspect_ratio = st->sample_aspect_ratio;
yading@11:         st2->avg_frame_rate      = st->avg_frame_rate;
yading@11:         av_dict_copy(&st2->metadata, st->metadata, 0);
yading@11:         if ((ret = avcodec_copy_context(st2->codec, st->codec)) < 0)
yading@11:             goto fail;
yading@11:     }
yading@11: 
yading@11:     if (!(avf2->oformat->flags & AVFMT_NOFILE)) {
yading@11:         if ((ret = avio_open(&avf2->pb, filename, AVIO_FLAG_WRITE)) < 0) {
yading@11:             av_log(avf, AV_LOG_ERROR, "Slave '%s': error opening: %s\n",
yading@11:                    slave, av_err2str(ret));
yading@11:             goto fail;
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     if ((ret = avformat_write_header(avf2, &options)) < 0) {
yading@11:         av_log(avf, AV_LOG_ERROR, "Slave '%s': error writing header: %s\n",
yading@11:                slave, av_err2str(ret));
yading@11:         goto fail;
yading@11:     }
yading@11:     if (options) {
yading@11:         entry = NULL;
yading@11:         while ((entry = av_dict_get(options, "", entry, AV_DICT_IGNORE_SUFFIX)))
yading@11:             av_log(avf2, AV_LOG_ERROR, "Unknown option '%s'\n", entry->key);
yading@11:         ret = AVERROR_OPTION_NOT_FOUND;
yading@11:         goto fail;
yading@11:     }
yading@11: 
yading@11:     *ravf = avf2;
yading@11:     return 0;
yading@11: 
yading@11: fail:
yading@11:     av_dict_free(&options);
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: static void close_slaves(AVFormatContext *avf)
yading@11: {
yading@11:     TeeContext *tee = avf->priv_data;
yading@11:     AVFormatContext *avf2;
yading@11:     unsigned i;
yading@11: 
yading@11:     for (i = 0; i < tee->nb_slaves; i++) {
yading@11:         avf2 = tee->slaves[i];
yading@11:         avio_close(avf2->pb);
yading@11:         avf2->pb = NULL;
yading@11:         avformat_free_context(avf2);
yading@11:         tee->slaves[i] = NULL;
yading@11:     }
yading@11: }
yading@11: 
yading@11: static int tee_write_header(AVFormatContext *avf)
yading@11: {
yading@11:     TeeContext *tee = avf->priv_data;
yading@11:     unsigned nb_slaves = 0, i;
yading@11:     const char *filename = avf->filename;
yading@11:     char *slaves[MAX_SLAVES];
yading@11:     int ret;
yading@11: 
yading@11:     while (*filename) {
yading@11:         if (nb_slaves == MAX_SLAVES) {
yading@11:             av_log(avf, AV_LOG_ERROR, "Maximum %d slave muxers reached.\n",
yading@11:                    MAX_SLAVES);
yading@11:             ret = AVERROR_PATCHWELCOME;
yading@11:             goto fail;
yading@11:         }
yading@11:         if (!(slaves[nb_slaves++] = av_get_token(&filename, slave_delim))) {
yading@11:             ret = AVERROR(ENOMEM);
yading@11:             goto fail;
yading@11:         }
yading@11:         if (strspn(filename, slave_delim))
yading@11:             filename++;
yading@11:     }
yading@11: 
yading@11:     for (i = 0; i < nb_slaves; i++) {
yading@11:         if ((ret = open_slave(avf, slaves[i], &tee->slaves[i])) < 0)
yading@11:             goto fail;
yading@11:         av_freep(&slaves[i]);
yading@11:     }
yading@11: 
yading@11:     tee->nb_slaves = nb_slaves;
yading@11:     return 0;
yading@11: 
yading@11: fail:
yading@11:     for (i = 0; i < nb_slaves; i++)
yading@11:         av_freep(&slaves[i]);
yading@11:     close_slaves(avf);
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: static int tee_write_trailer(AVFormatContext *avf)
yading@11: {
yading@11:     TeeContext *tee = avf->priv_data;
yading@11:     AVFormatContext *avf2;
yading@11:     int ret_all = 0, ret;
yading@11:     unsigned i;
yading@11: 
yading@11:     for (i = 0; i < tee->nb_slaves; i++) {
yading@11:         avf2 = tee->slaves[i];
yading@11:         if ((ret = av_write_trailer(avf2)) < 0)
yading@11:             if (!ret_all)
yading@11:                 ret_all = ret;
yading@11:         if (!(avf2->oformat->flags & AVFMT_NOFILE)) {
yading@11:             if ((ret = avio_close(avf2->pb)) < 0)
yading@11:                 if (!ret_all)
yading@11:                     ret_all = ret;
yading@11:             avf2->pb = NULL;
yading@11:         }
yading@11:     }
yading@11:     close_slaves(avf);
yading@11:     return ret_all;
yading@11: }
yading@11: 
yading@11: static int tee_write_packet(AVFormatContext *avf, AVPacket *pkt)
yading@11: {
yading@11:     TeeContext *tee = avf->priv_data;
yading@11:     AVFormatContext *avf2;
yading@11:     AVPacket pkt2;
yading@11:     int ret_all = 0, ret;
yading@11:     unsigned i, s;
yading@11:     AVRational tb, tb2;
yading@11: 
yading@11:     for (i = 0; i < tee->nb_slaves; i++) {
yading@11:         avf2 = tee->slaves[i];
yading@11:         s = pkt->stream_index;
yading@11:         if (s >= avf2->nb_streams) {
yading@11:             if (!ret_all)
yading@11:                 ret_all = AVERROR(EINVAL);
yading@11:             continue;
yading@11:         }
yading@11:         if ((ret = av_copy_packet(&pkt2, pkt)) < 0 ||
yading@11:             (ret = av_dup_packet(&pkt2))< 0)
yading@11:             if (!ret_all) {
yading@11:                 ret = ret_all;
yading@11:                 continue;
yading@11:             }
yading@11:         tb  = avf ->streams[s]->time_base;
yading@11:         tb2 = avf2->streams[s]->time_base;
yading@11:         pkt2.pts      = av_rescale_q(pkt->pts,      tb, tb2);
yading@11:         pkt2.dts      = av_rescale_q(pkt->dts,      tb, tb2);
yading@11:         pkt2.duration = av_rescale_q(pkt->duration, tb, tb2);
yading@11:         if ((ret = av_interleaved_write_frame(avf2, &pkt2)) < 0)
yading@11:             if (!ret_all)
yading@11:                 ret_all = ret;
yading@11:     }
yading@11:     return ret_all;
yading@11: }
yading@11: 
yading@11: AVOutputFormat ff_tee_muxer = {
yading@11:     .name              = "tee",
yading@11:     .long_name         = NULL_IF_CONFIG_SMALL("Multiple muxer tee"),
yading@11:     .priv_data_size    = sizeof(TeeContext),
yading@11:     .write_header      = tee_write_header,
yading@11:     .write_trailer     = tee_write_trailer,
yading@11:     .write_packet      = tee_write_packet,
yading@11:     .priv_class        = &tee_muxer_class,
yading@11:     .flags             = AVFMT_NOFILE,
yading@11: };