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oggdemux: enhance flac packet duration calculation

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This commit is contained in:
Mark Nauwelaerts 2010-01-05 14:11:06 +01:00
parent fe970cb856
commit 8fb183c7c9
1 changed files with 26 additions and 1 deletions
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27
ext/ogg/gstoggstream.c
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@ -637,6 +637,31 @@ packet_duration_flac (GstOggStream * pad, ogg_packet * packet)
if (block_size_index >= 8) {
return 256 << (block_size_index - 8);
}
if (block_size_index == 6 || block_size_index == 7) {
guint len, bytes = (block_size_index - 6) + 1;
guint8 tmp;
if (packet->bytes < 4 + 1 + bytes)
return -1;
tmp = packet->packet[4];
/* utf-8 prefix */
len = 0;
while (tmp & 0x80) {
len++;
tmp <<= 1;
}
if (len == 2)
return -1;
if (len == 0)
len++;
if (packet->bytes < 4 + len + bytes)
return -1;
if (bytes == 1) {
return packet->packet[4 + len] + 1;
} else {
return GST_READ_UINT16_BE (packet->packet + 4 + len) + 1;
}
}
return -1;
}
@ -1156,7 +1181,7 @@ static const GstOggMap mappers[] = {
NULL
},
{
"\177FLAC", 4, 36,
"\177FLAC", 5, 36,
"audio/x-flac",
setup_flac_mapper,
granulepos_to_granule_default,