static int
rdt_load_mdpr (PayloadContext *rdt, AVStream *st, int rule_nr)
{
AVIOContext pb;
int size;
uint32_t tag;
/**
* Layout of the MLTI chunk:
* 4: MLTI
* 2: number of streams
* Then for each stream ([number_of_streams] times):
* 2: mdpr index
* 2: number of mdpr chunks
* Then for each mdpr chunk ([number_of_mdpr_chunks] times):
* 4: size
* [size]: data
* we skip MDPR chunks until we reach the one of the stream
* we're interested in, and forward that ([size]+[data]) to
* the RM demuxer to parse the stream-specific header data.
*/
if (!rdt->mlti_data)
return -1;
ffio_init_context(&pb, rdt->mlti_data, rdt->mlti_data_size, 0,
NULL, NULL, NULL, NULL);
tag = avio_rl32(&pb);
if (tag == MKTAG('M', 'L', 'T', 'I'))
{
int num, chunk_nr;
/* read index of MDPR chunk numbers */
num = avio_rb16(&pb);
if (rule_nr < 0 || rule_nr >= num)
return -1;
avio_skip(&pb, rule_nr * 2);
chunk_nr = avio_rb16(&pb);
avio_skip(&pb, (num - 1 - rule_nr) * 2);
/* read MDPR chunks */
num = avio_rb16(&pb);
if (chunk_nr >= num)
return -1;
while (chunk_nr--)
avio_skip(&pb, avio_rb32(&pb));
size = avio_rb32(&pb);
}
else
{
size = rdt->mlti_data_size;
avio_seek(&pb, 0, SEEK_SET);
}
if (ff_rm_read_mdpr_codecdata(rdt->rmctx, &pb, st, rdt->rmst[st->index], size) < 0)
return -1;
return 0;
}
static int rm_read_header(AVFormatContext *s)
{
RMDemuxContext *rm = s->priv_data;
AVStream *st;
AVIOContext *pb = s->pb;
unsigned int tag;
int tag_size;
unsigned int start_time, duration;
unsigned int data_off = 0, indx_off = 0;
char buf[128], mime[128];
int flags = 0;
tag = avio_rl32(pb);
if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
/* very old .ra format */
return rm_read_header_old(s);
} else if (tag != MKTAG('.', 'R', 'M', 'F')) {
return AVERROR(EIO);
}
tag_size = avio_rb32(pb);
avio_skip(pb, tag_size - 8);
for(;;) {
if (avio_feof(pb))
return -1;
tag = avio_rl32(pb);
tag_size = avio_rb32(pb);
avio_rb16(pb);
av_dlog(s, "tag=%c%c%c%c (%08x) size=%d\n",
(tag ) & 0xff,
(tag >> 8) & 0xff,
(tag >> 16) & 0xff,
(tag >> 24) & 0xff,
tag,
tag_size);
if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
return -1;
switch(tag) {
case MKTAG('P', 'R', 'O', 'P'):
/* file header */
avio_rb32(pb); /* max bit rate */
avio_rb32(pb); /* avg bit rate */
avio_rb32(pb); /* max packet size */
avio_rb32(pb); /* avg packet size */
avio_rb32(pb); /* nb packets */
duration = avio_rb32(pb); /* duration */
s->duration = av_rescale(duration, AV_TIME_BASE, 1000);
avio_rb32(pb); /* preroll */
indx_off = avio_rb32(pb); /* index offset */
data_off = avio_rb32(pb); /* data offset */
avio_rb16(pb); /* nb streams */
flags = avio_rb16(pb); /* flags */
break;
case MKTAG('C', 'O', 'N', 'T'):
rm_read_metadata(s, pb, 1);
break;
case MKTAG('M', 'D', 'P', 'R'):
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->id = avio_rb16(pb);
avio_rb32(pb); /* max bit rate */
st->codec->bit_rate = avio_rb32(pb); /* bit rate */
avio_rb32(pb); /* max packet size */
avio_rb32(pb); /* avg packet size */
start_time = avio_rb32(pb); /* start time */
avio_rb32(pb); /* preroll */
duration = avio_rb32(pb); /* duration */
st->start_time = start_time;
st->duration = duration;
if(duration>0)
s->duration = AV_NOPTS_VALUE;
get_str8(pb, buf, sizeof(buf)); /* desc */
get_str8(pb, mime, sizeof(mime)); /* mimetype */
st->codec->codec_type = AVMEDIA_TYPE_DATA;
st->priv_data = ff_rm_alloc_rmstream();
if (ff_rm_read_mdpr_codecdata(s, s->pb, st, st->priv_data,
avio_rb32(pb), mime) < 0)
return -1;
break;
case MKTAG('D', 'A', 'T', 'A'):
goto header_end;
default:
/* unknown tag: skip it */
avio_skip(pb, tag_size - 10);
break;
}
}
header_end:
rm->nb_packets = avio_rb32(pb); /* number of packets */
if (!rm->nb_packets && (flags & 4))
rm->nb_packets = 3600 * 25;
avio_rb32(pb); /* next data header */
if (!data_off)
data_off = avio_tell(pb) - 18;
if (indx_off && pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
avio_seek(pb, indx_off, SEEK_SET) >= 0) {
rm_read_index(s);
avio_seek(pb, data_off + 18, SEEK_SET);
}
return 0;
}