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(OGG): recognize Ogg streams embedded into WAVE files.

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This commit is contained in:
morkt 2018-01-11 20:25:50 +04:00
parent 2d389ec528
commit 0d43484e34
1 changed files with 35 additions and 1 deletions
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36
ArcFormats/AudioOGG.cs
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@ -131,9 +131,43 @@ namespace GameRes.Formats
public override uint Signature { get { return 0x5367674f; } } // 'OggS'
public override bool CanWrite { get { return false; } }
public OggAudio ()
{
Signatures = new uint[] { 0x5367674F, 0 };
}
public override SoundInput TryOpen (IBinaryStream file)
{
return new OggInput (file.AsStream);
Stream input = file.AsStream;
if (file.Signature == Wav.Signature)
{
var header = file.ReadHeader (0x14);
if (!header.AsciiEqual (8, "WAVEfmt "))
return null;
uint fmt_size = header.ToUInt32 (0x10);
long fmt_pos = file.Position;
ushort format = file.ReadUInt16();
if (format != 0x6770 && format != 0x6771)
return null;
// interpret WAVE 'data' section as Ogg stream
file.Position = fmt_pos + ((fmt_size + 1) & ~1);
for (;;) // ended by end-of-stream exception
{
uint section_id = file.ReadUInt32();
uint section_size = file.ReadUInt32();
if (section_id == 0x61746164) // 'data'
{
long ogg_pos = file.Position;
uint id = file.ReadUInt32();
if (id != Signature)
return null;
input = new StreamRegion (input, ogg_pos, section_size);
break;
}
file.Seek ((section_size + 1) & ~1, SeekOrigin.Current);
}
}
return new OggInput (input);
}
public static AudioFormat Instance { get { return s_OggFormat.Value; } }