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(MP3): seek for frame sync in first 256 bytes.

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This commit is contained in:
morkt 2017-01-28 11:17:01 +04:00
parent 75de4663b8
commit 0ca4a04ff7
1 changed files with 10 additions and 1 deletions
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11
ArcFormats/AudioMP3.cs
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@ -98,13 +98,22 @@ namespace GameRes.Formats
{
var header = file.ReadHeader (10).ToArray();
long start_offset = SkipId3Tag (header);
int sync_pos = 0;
if (0 != start_offset)
{
file.Position = start_offset;
if (4 != file.Read (header, 0, 4))
return null;
}
if (0xff != header[0] || 0xe2 != (header[1] & 0xe6) || 0xf0 == (header[2] & 0xf0))
else if (0xFF != header[0])
{
file.Position = 1;
header = file.ReadBytes (0x100);
sync_pos = System.Array.IndexOf<byte> (header, 0xFF, 1, 0xFC);
if (-1 == sync_pos)
return null;
}
if (0xFF != header[sync_pos] || 0xE2 != (header[sync_pos+1] & 0xE6) || 0xF0 == (header[sync_pos+2] & 0xF0))
return null;
file.Position = 0;
return new Mp3Input (file.AsStream);