ffmpeg/libavformat/tee.c

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2013-02-09 19:50:11 +00:00
/*
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* Tee pseudo-muxer
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* Copyright (c) 2012 Nicolas George
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with FFmpeg; if not, write to the Free Software * Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/avutil.h"
#include "libavutil/avstring.h"
#include "libavutil/opt.h"
#include "avformat.h"
#define MAX_SLAVES 16
typedef struct TeeContext {
const AVClass *class;
unsigned nb_slaves;
AVFormatContext *slaves[MAX_SLAVES];
} TeeContext;
static const char *const slave_delim = "|";
static const char *const slave_opt_open = "[";
static const char *const slave_opt_close = "]";
static const char *const slave_opt_delim = ":]"; /* must have the close too */
static const AVClass tee_muxer_class = {
.class_name = "Tee muxer",
.item_name = av_default_item_name,
.version = LIBAVUTIL_VERSION_INT,
};
static int parse_slave_options(void *log, char *slave,
AVDictionary **options, char **filename)
{
const char *p;
char *key, *val;
int ret;
if (!strspn(slave, slave_opt_open)) {
*filename = slave;
return 0;
}
p = slave + 1;
if (strspn(p, slave_opt_close)) {
*filename = (char *)p + 1;
return 0;
}
while (1) {
ret = av_opt_get_key_value(&p, "=", slave_opt_delim, 0, &key, &val);
if (ret < 0) {
av_log(log, AV_LOG_ERROR, "No option found near \"%s\"\n", p);
goto fail;
}
ret = av_dict_set(options, key, val,
AV_DICT_DONT_STRDUP_KEY | AV_DICT_DONT_STRDUP_VAL);
if (ret < 0)
goto fail;
if (strspn(p, slave_opt_close))
break;
p++;
}
*filename = (char *)p + 1;
return 0;
fail:
av_dict_free(options);
return ret;
}
static int open_slave(AVFormatContext *avf, char *slave, AVFormatContext **ravf)
{
int i, ret;
AVDictionary *options = NULL;
AVDictionaryEntry *entry;
char *filename;
char *format = NULL;
AVFormatContext *avf2 = NULL;
AVStream *st, *st2;
if ((ret = parse_slave_options(avf, slave, &options, &filename)) < 0)
return ret;
if ((entry = av_dict_get(options, "f", NULL, 0))) {
format = entry->value;
entry->value = NULL; /* prevent it from being freed */
av_dict_set(&options, "f", NULL, 0);
}
ret = avformat_alloc_output_context2(&avf2, NULL, format, filename);
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if (ret < 0)
goto fail;
av_free(format);
for (i = 0; i < avf->nb_streams; i++) {
st = avf->streams[i];
if (!(st2 = avformat_new_stream(avf2, NULL))) {
ret = AVERROR(ENOMEM);
goto fail;
}
st2->id = st->id;
st2->r_frame_rate = st->r_frame_rate;
st2->time_base = st->time_base;
st2->start_time = st->start_time;
st2->duration = st->duration;
st2->nb_frames = st->nb_frames;
st2->disposition = st->disposition;
st2->sample_aspect_ratio = st->sample_aspect_ratio;
st2->avg_frame_rate = st->avg_frame_rate;
av_dict_copy(&st2->metadata, st->metadata, 0);
if ((ret = avcodec_copy_context(st2->codec, st->codec)) < 0)
goto fail;
}
if (!(avf2->oformat->flags & AVFMT_NOFILE)) {
if ((ret = avio_open(&avf2->pb, filename, AVIO_FLAG_WRITE)) < 0) {
av_log(avf, AV_LOG_ERROR, "Slave '%s': error opening: %s\n",
slave, av_err2str(ret));
goto fail;
}
}
if ((ret = avformat_write_header(avf2, &options)) < 0) {
av_log(avf, AV_LOG_ERROR, "Slave '%s': error writing header: %s\n",
slave, av_err2str(ret));
goto fail;
}
if (options) {
entry = NULL;
while ((entry = av_dict_get(options, "", entry, AV_DICT_IGNORE_SUFFIX)))
av_log(avf2, AV_LOG_ERROR, "Unknown option '%s'\n", entry->key);
ret = AVERROR_OPTION_NOT_FOUND;
goto fail;
}
*ravf = avf2;
return 0;
fail:
av_dict_free(&options);
return ret;
}
static void close_slaves(AVFormatContext *avf)
{
TeeContext *tee = avf->priv_data;
AVFormatContext *avf2;
unsigned i;
for (i = 0; i < tee->nb_slaves; i++) {
avf2 = tee->slaves[i];
avio_close(avf2->pb);
avf2->pb = NULL;
avformat_free_context(avf2);
tee->slaves[i] = NULL;
}
}
static int tee_write_header(AVFormatContext *avf)
{
TeeContext *tee = avf->priv_data;
unsigned nb_slaves = 0, i;
const char *filename = avf->filename;
char *slaves[MAX_SLAVES];
int ret;
while (*filename) {
if (nb_slaves == MAX_SLAVES) {
av_log(avf, AV_LOG_ERROR, "Maximum %d slave muxers reached.\n",
MAX_SLAVES);
ret = AVERROR_PATCHWELCOME;
goto fail;
}
if (!(slaves[nb_slaves++] = av_get_token(&filename, slave_delim))) {
ret = AVERROR(ENOMEM);
goto fail;
}
if (strspn(filename, slave_delim))
filename++;
}
for (i = 0; i < nb_slaves; i++) {
if ((ret = open_slave(avf, slaves[i], &tee->slaves[i])) < 0)
goto fail;
av_freep(&slaves[i]);
}
tee->nb_slaves = nb_slaves;
return 0;
fail:
for (i = 0; i < nb_slaves; i++)
av_freep(&slaves[i]);
close_slaves(avf);
return ret;
}
static int tee_write_trailer(AVFormatContext *avf)
{
TeeContext *tee = avf->priv_data;
AVFormatContext *avf2;
int ret_all = 0, ret;
unsigned i;
for (i = 0; i < tee->nb_slaves; i++) {
avf2 = tee->slaves[i];
if ((ret = av_write_trailer(avf2)) < 0)
if (!ret_all)
ret_all = ret;
if (!(avf2->oformat->flags & AVFMT_NOFILE)) {
if ((ret = avio_close(avf2->pb)) < 0)
if (!ret_all)
ret_all = ret;
avf2->pb = NULL;
}
}
close_slaves(avf);
return ret_all;
}
static int tee_write_packet(AVFormatContext *avf, AVPacket *pkt)
{
TeeContext *tee = avf->priv_data;
AVFormatContext *avf2;
AVPacket pkt2;
int ret_all = 0, ret;
unsigned i, s;
AVRational tb, tb2;
for (i = 0; i < tee->nb_slaves; i++) {
avf2 = tee->slaves[i];
s = pkt->stream_index;
if (s >= avf2->nb_streams) {
if (!ret_all)
ret_all = AVERROR(EINVAL);
continue;
}
if ((ret = av_copy_packet(&pkt2, pkt)) < 0 ||
(ret = av_dup_packet(&pkt2))< 0)
if (!ret_all) {
ret = ret_all;
continue;
}
tb = avf ->streams[s]->time_base;
tb2 = avf2->streams[s]->time_base;
pkt2.pts = av_rescale_q(pkt->pts, tb, tb2);
pkt2.dts = av_rescale_q(pkt->dts, tb, tb2);
pkt2.duration = av_rescale_q(pkt->duration, tb, tb2);
if ((ret = av_interleaved_write_frame(avf2, &pkt2)) < 0)
if (!ret_all)
ret_all = ret;
}
return ret_all;
}
AVOutputFormat ff_tee_muxer = {
.name = "tee",
.long_name = NULL_IF_CONFIG_SMALL("Multiple muxer tee"),
.priv_data_size = sizeof(TeeContext),
.write_header = tee_write_header,
.write_trailer = tee_write_trailer,
.write_packet = tee_write_packet,
.priv_class = &tee_muxer_class,
.flags = AVFMT_NOFILE,
};