/*
* Tee pseudo-muxer
* 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 {
AVFormatContext *avf;
AVBitStreamFilterContext **bsfs; ///< bitstream filters per stream
/** map from input to output streams indexes,
* disabled output streams are set to -1 */
int *stream_map;
} TeeSlave;
typedef struct TeeContext {
const AVClass *class;
unsigned nb_slaves;
TeeSlave 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 char *const slave_bsfs_spec_sep = "/";
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;
}
/**
* Parse list of bitstream filters and add them to the list of filters
* pointed to by bsfs.
*
* The list must be specified in the form:
* BSFS ::= BSF[,BSFS]
*/
static int parse_bsfs(void *log_ctx, const char *bsfs_spec,
AVBitStreamFilterContext **bsfs)
{
char *bsf_name, *buf, *dup, *saveptr;
int ret = 0;
if (!(dup = buf = av_strdup(bsfs_spec)))
return AVERROR(ENOMEM);
while (bsf_name = av_strtok(buf, ",", &saveptr)) {
AVBitStreamFilterContext *bsf = av_bitstream_filter_init(bsf_name);
if (!bsf) {
av_log(log_ctx, AV_LOG_ERROR,
"Cannot initialize bitstream filter with name '%s', "
"unknown filter or internal error happened\n",
bsf_name);
ret = AVERROR_UNKNOWN;
goto end;
}
/* append bsf context to the list of bsf contexts */
*bsfs = bsf;
bsfs = &bsf->next;
buf = NULL;
}
end:
av_free(dup);
return ret;
}
static int open_slave(AVFormatContext *avf, char *slave, TeeSlave *tee_slave)
{
int i, ret;
AVDictionary *options = NULL;
AVDictionaryEntry *entry;
char *filename;
char *format = NULL, *select = NULL;
AVFormatContext *avf2 = NULL;
AVStream *st, *st2;
int stream_count;
if ((ret = parse_slave_options(avf, slave, &options, &filename)) < 0)
return ret;
#define STEAL_OPTION(option, field) do { \
if ((entry = av_dict_get(options, option, NULL, 0))) { \
field = entry->value; \
entry->value = NULL; /* prevent it from being freed */ \
av_dict_set(&options, option, NULL, 0); \
} \
} while (0)
STEAL_OPTION("f", format);
STEAL_OPTION("select", select);
ret = avformat_alloc_output_context2(&avf2, NULL, format, filename);
if (ret < 0)
goto end;
av_dict_copy(&avf2->metadata, avf->metadata, 0);
tee_slave->stream_map = av_calloc(avf->nb_streams, sizeof(*tee_slave->stream_map));
if (!tee_slave->stream_map) {
ret = AVERROR(ENOMEM);
goto end;
}
stream_count = 0;
for (i = 0; i < avf->nb_streams; i++) {
st = avf->streams[i];
if (select) {
ret = avformat_match_stream_specifier(avf, avf->streams[i], select);
if (ret < 0) {
av_log(avf, AV_LOG_ERROR,
"Invalid stream specifier '%s' for output '%s'\n",
select, slave);
goto end;
}
if (ret == 0) { /* no match */
tee_slave->stream_map[i] = -1;
continue;
}
}
tee_slave->stream_map[i] = stream_count++;
if (!(st2 = avformat_new_stream(avf2, NULL))) {
ret = AVERROR(ENOMEM);
goto end;
}
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 end;
}
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 end;
}
}
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 end;
}
tee_slave->avf = avf2;
tee_slave->bsfs = av_calloc(avf2->nb_streams, sizeof(TeeSlave));
if (!tee_slave->bsfs) {
ret = AVERROR(ENOMEM);
goto end;
}
entry = NULL;
while (entry = av_dict_get(options, "bsfs", NULL, AV_DICT_IGNORE_SUFFIX)) {
const char *spec
= entry
->key
+ strlen("bsfs"); if (*spec) {
if (strspn(spec
, slave_bsfs_spec_sep
) != 1) { av_log(avf, AV_LOG_ERROR,
"Specifier separator in '%s' is '%c', but only characters '%s' "
"are allowed\n", entry->key, *spec, slave_bsfs_spec_sep);
return AVERROR(EINVAL);
}
spec++; /* consume separator */
}
for (i = 0; i < avf2->nb_streams; i++) {
ret = avformat_match_stream_specifier(avf2, avf2->streams[i], spec);
if (ret < 0) {
av_log(avf, AV_LOG_ERROR,
"Invalid stream specifier '%s' in bsfs option '%s' for slave "
"output '%s'\n", spec, entry->key, filename);
goto end;
}
if (ret > 0) {
av_log(avf, AV_LOG_DEBUG, "spec:%s bsfs:%s matches stream %d of slave "
"output '%s'\n", spec, entry->value, i, filename);
if (tee_slave->bsfs[i]) {
av_log(avf, AV_LOG_WARNING,
"Duplicate bsfs specification associated to stream %d of slave "
"output '%s', filters will be ignored\n", i, filename);
continue;
}
ret = parse_bsfs(avf, entry->value, &tee_slave->bsfs[i]);
if (ret < 0) {
av_log(avf, AV_LOG_ERROR,
"Error parsing bitstream filter sequence '%s' associated to "
"stream %d of slave output '%s'\n", entry->value, i, filename);
goto end;
}
}
}
av_dict_set(&options, entry->key, NULL, 0);
}
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 end;
}
end:
av_free(format);
av_free(select);
av_dict_free(&options);
return ret;
}
static void close_slaves(AVFormatContext *avf)
{
TeeContext *tee = avf->priv_data;
AVFormatContext *avf2;
unsigned i, j;
for (i = 0; i < tee->nb_slaves; i++) {
avf2 = tee->slaves[i].avf;
for (j = 0; j < avf2->nb_streams; j++) {
AVBitStreamFilterContext *bsf_next, *bsf = tee->slaves[i].bsfs[j];
while (bsf) {
bsf_next = bsf->next;
av_bitstream_filter_close(bsf);
bsf = bsf_next;
}
}
av_freep(&tee->slaves[i].stream_map);
av_freep(&tee->slaves[i].bsfs);
avio_close(avf2->pb);
avf2->pb = NULL;
avformat_free_context(avf2);
tee->slaves[i].avf = NULL;
}
}
static void log_slave(TeeSlave *slave, void *log_ctx, int log_level)
{
int i;
av_log(log_ctx, log_level, "filename:'%s' format:%s\n",
slave->avf->filename, slave->avf->oformat->name);
for (i = 0; i < slave->avf->nb_streams; i++) {
AVStream *st = slave->avf->streams[i];
AVBitStreamFilterContext *bsf = slave->bsfs[i];
av_log(log_ctx, log_level, " stream:%d codec:%s type:%s",
i, avcodec_get_name(st->codec->codec_id),
av_get_media_type_string(st->codec->codec_type));
if (bsf) {
av_log(log_ctx, log_level, " bsfs:");
while (bsf) {
av_log(log_ctx, log_level, "%s%s",
bsf->filter->name, bsf->next ? "," : "");
bsf = bsf->next;
}
}
av_log(log_ctx, log_level, "\n");
}
}
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;
log_slave(&tee->slaves[i], avf, AV_LOG_VERBOSE);
av_freep(&slaves[i]);
}
tee->nb_slaves = nb_slaves;
for (i = 0; i < avf->nb_streams; i++) {
int j, mapped = 0;
for (j = 0; j < tee->nb_slaves; j++)
mapped += tee->slaves[j].stream_map[i] >= 0;
if (!mapped)
av_log(avf, AV_LOG_WARNING, "Input stream #%d is not mapped "
"to any slave.\n", i);
}
return 0;
fail:
for (i = 0; i < nb_slaves; i++)
av_freep(&slaves[i]);
close_slaves(avf);
return ret;
}
static int filter_packet(void *log_ctx, AVPacket *pkt,
AVFormatContext *fmt_ctx, AVBitStreamFilterContext *bsf_ctx)
{
AVCodecContext *enc_ctx = fmt_ctx->streams[pkt->stream_index]->codec;
int ret = 0;
while (bsf_ctx) {
AVPacket new_pkt = *pkt;
ret = av_bitstream_filter_filter(bsf_ctx, enc_ctx, NULL,
&new_pkt.data, &new_pkt.size,
pkt->data, pkt->size,
pkt->flags & AV_PKT_FLAG_KEY);
if (ret == 0 && new_pkt.data != pkt->data && new_pkt.destruct) {
if ((ret = av_copy_packet(&new_pkt, pkt)) < 0)
break;
ret = 1;
}
if (ret > 0) {
av_free_packet(pkt);
new_pkt.buf = av_buffer_create(new_pkt.data, new_pkt.size,
av_buffer_default_free, NULL, 0);
if (!new_pkt.buf)
break;
}
*pkt = new_pkt;
bsf_ctx = bsf_ctx->next;
}
if (ret < 0) {
av_log(log_ctx, AV_LOG_ERROR,
"Failed to filter bitstream with filter %s for stream %d in file '%s' with codec %s\n",
bsf_ctx->filter->name, pkt->stream_index, fmt_ctx->filename,
avcodec_get_name(enc_ctx->codec_id));
}
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].avf;
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;
int s2;
AVRational tb, tb2;
for (i = 0; i < tee->nb_slaves; i++) {
avf2 = tee->slaves[i].avf;
s = pkt->stream_index;
s2 = tee->slaves[i].stream_map[s];
if (s2 < 0)
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[s2]->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);
pkt2.stream_index = s2;
filter_packet(avf2, &pkt2, avf2, tee->slaves[i].bsfs[s2]);
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,
};