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avformat/asfdec_f: Parse ECC byte according to spec

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This should not change anything as the spec requires specific values
for the fields, which where handled previously.

Ask for samples when these values do not match

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-07-22 13:49:31 +02:00
parent 3e35f8efa1
commit 9837d3b068
1 changed files with 21 additions and 7 deletions
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28
libavformat/asfdec_f.c
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@ -958,13 +958,13 @@ static int asf_get_packet(AVFormatContext *s, AVIOContext *pb)
int rsize = 8;
int c, d, e, off;
if (asf->uses_std_ecc >= 0) {
if (asf->uses_std_ecc > 0) {
// if we do not know packet size, allow skipping up to 32 kB
off = 32768;
if (asf->no_resync_search)
off = 3;
else if (s->packet_size > 0 && !asf->uses_std_ecc)
off = (avio_tell(pb) - s->internal->data_offset) % s->packet_size + 3;
// else if (s->packet_size > 0 && !asf->uses_std_ecc)
// off = (avio_tell(pb) - s->internal->data_offset) % s->packet_size + 3;
c = d = e = -1;
while (off-- > 0) {
@ -975,10 +975,6 @@ static int asf_get_packet(AVFormatContext *s, AVIOContext *pb)
break;
}
if (!asf->uses_std_ecc) {
asf->uses_std_ecc = (c == 0x82 && !d && !e) ? 1 : -1;
}
if (c != 0x82) {
/* This code allows handling of -EAGAIN at packet boundaries (i.e.
* if the packet sync code above triggers -EAGAIN). This does not
@ -1004,6 +1000,24 @@ static int asf_get_packet(AVFormatContext *s, AVIOContext *pb)
}
} else {
c = avio_r8(pb);
if (c & 0x80) {
rsize ++;
if (!(c & 0x60)) {
d = avio_r8(pb);
e = avio_r8(pb);
avio_seek(pb, (c & 0xF) - 2, SEEK_CUR);
rsize += c & 0xF;
}
if (c != 0x82)
avpriv_request_sample(s, "Invalid ECC byte\n");
if (!asf->uses_std_ecc)
asf->uses_std_ecc = (c == 0x82 && !d && !e) ? 1 : -1;
c = avio_r8(pb);
} else
asf->uses_std_ecc = -1;
d = avio_r8(pb);
}