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(OGG): added fix checksums setting.

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This commit is contained in:
morkt
2018-01-30 09:30:34 +04:00
parent 0a702c5c5d
commit ebbac01c40
10 changed files with 137 additions and 1 deletions
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93
ArcFormats/AudioOGG.cs
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@@ -27,6 +27,7 @@ using System;
using System.ComponentModel.Composition;
using System.IO;
using System.Linq;
using GameRes.Utility;
using NVorbis;
namespace GameRes.Formats
@@ -124,16 +125,19 @@ namespace GameRes.Formats
}
[Export(typeof(AudioFormat))]
public class OggAudio : AudioFormat
public sealed class OggAudio : AudioFormat
{
public override string Tag { get { return "OGG"; } }
public override string Description { get { return "Ogg/Vorbis audio format"; } }
public override uint Signature { get { return 0x5367674f; } } // 'OggS'
public override bool CanWrite { get { return false; } }
LocalResourceSetting FixCrc = new LocalResourceSetting ("OGGFixCrc");
public OggAudio ()
{
Signatures = new uint[] { 0x5367674F, 0 };
Settings = new[] { FixCrc };
}
public override SoundInput TryOpen (IBinaryStream file)
@@ -169,6 +173,8 @@ namespace GameRes.Formats
}
else if (file.Signature != this.Signature)
return null;
if (FixCrc.Get<bool>())
input = new SeekableStream (new OggRestoreStream (input));
return new OggInput (input);
}
@@ -176,4 +182,89 @@ namespace GameRes.Formats
static readonly ResourceInstance<AudioFormat> s_OggFormat = new ResourceInstance<AudioFormat> ("OGG");
}
/// <summary>
/// Restore CRC checksums of the OGG stream pages.
/// </summary>
internal class OggRestoreStream : InputProxyStream
{
bool m_eof;
bool m_ogg_ended;
byte[] m_page = new byte[0x10000];
int m_page_pos = 0;
int m_page_length = 0;
public override bool CanSeek { get { return false; } }
public OggRestoreStream (Stream input) : base (input)
{
}
public override int Read (byte[] buffer, int offset, int count)
{
int total_read = 0;
while (count > 0 && !m_eof)
{
if (m_page_pos == m_page_length)
{
if (m_ogg_ended)
{
int read = BaseStream.Read (buffer, offset, count);
total_read += read;
m_eof = 0 == read;
break;
}
NextPage();
}
if (m_eof)
break;
int available = Math.Min (m_page_length - m_page_pos, count);
Buffer.BlockCopy (m_page, m_page_pos, buffer, offset, available);
m_page_pos += available;
offset += available;
count -= available;
total_read += available;
}
return total_read;
}
void NextPage ()
{
m_page_pos = 0;
m_page_length = BaseStream.Read (m_page, 0, 0x1B);
if (0 == m_page_length)
{
m_eof = true;
return;
}
if (m_page_length < 0x1B || !m_page.AsciiEqual ("OggS"))
{
m_ogg_ended = true;
return;
}
int segment_count = m_page[0x1A];
m_page[0x16] = 0;
m_page[0x17] = 0;
m_page[0x18] = 0;
m_page[0x19] = 0;
if (segment_count != 0)
{
int table_length = BaseStream.Read (m_page, 0x1B, segment_count);
m_page_length += table_length;
if (table_length != segment_count)
{
m_ogg_ended = true;
return;
}
int segments_length = 0;
int segment_table = 0x1B;
for (int i = 0; i < segment_count; ++i)
segments_length += m_page[segment_table++];
m_page_length += BaseStream.Read (m_page, 0x1B+segment_count, segments_length);
}
uint crc = Crc32Normal.UpdateCrc (0, m_page, 0, m_page_length);
LittleEndian.Pack (crc, m_page, 0x16);
}
}
}