// http://dvd.sourceforge.net/dvdinfo/ifo.html#audatt
public static AudioValues ReadAudioSpecs(byte b0, byte b1, byte b5)
{
int byte0_high = (b0 & 0xF0) >> 4;
int byte0_low = (b0 & 0x0F);
int byte1_high = (b1 & 0xF0) >> 4;
int byte1_low = (b1 & 0x0F);
AudioValues result = new AudioValues();
switch (b5)
{
case 0: result.Extension = AudioExtension.Unspecified; break;
case 1: result.Extension = AudioExtension.Normal; break;
case 2: result.Extension = AudioExtension.For_visually_impaired; break;
case 3: result.Extension = AudioExtension.Director_s_comments; break;
case 4: result.Extension = AudioExtension.Alternate_director_s_comments; break;
}
result.LanguageTypePresent = (byte0_low & 0x04) == 0x04;
result.Channels = (byte1_low & 0x07) + 1;
if ((byte1_high & 0x03) == 0)
{
result.SampleRate = 0x30;
}
switch (byte0_high >> 1)
{
case 0: result.Encoding = AudioEncoding.AC3; break;
case 1: result.Encoding = AudioEncoding.Undefined; break;
case 2: result.Encoding = AudioEncoding.MPEG1; break;
case 3: result.Encoding = AudioEncoding.MPEG2; break;
case 4: result.Encoding = AudioEncoding.LPCM; break;
case 5: result.Encoding = AudioEncoding.Undefined; break;
case 6: result.Encoding = AudioEncoding.DTS; break;
case 7: result.Encoding = AudioEncoding.Undefined; break;
}
return(result);
}
internal static List <DVDAudioTrack> AudioTracks(string ifoFile)
{
List <DVDAudioTrack> ret = new List <DVDAudioTrack>();
int audioStreams = IFOUtilities.GetFileBlock(ifoFile, 0x203, 1)[0];
for (int currentAudioStream = 1; currentAudioStream <= audioStreams; currentAudioStream++)
{
byte[] bytes = IFOUtilities.GetFileBlock(ifoFile, (long)(0x204 + (8 * (currentAudioStream - 1))), 8);
AudioValues audioValues = AudioValues.ReadAudioSpecs(bytes[0], bytes[1], bytes[5]);
string languageCode = "";
if (audioValues.LanguageTypePresent)
{
languageCode = "" + (char)bytes[2] + (char)bytes[3];
}
// audio channel
// - MPEG: 0-31
// - VOB(AC3): 128-159
// - VOB(LPCM): 160-191
int id = currentAudioStream - 1;
if (audioValues.Encoding == AudioEncoding.AC3)
{
id = 127 + currentAudioStream;
}
else if (audioValues.Encoding == AudioEncoding.DTS)
{
id = 135 + currentAudioStream;
}
else if (audioValues.Encoding == AudioEncoding.LPCM)
{
id = 159 + currentAudioStream;
}
ret.Add(new DVDAudioTrack()
{
Frequency = audioValues.SampleRate * 1000,
LanguageID = languageCode,
TrackNumber = currentAudioStream,
ID = id,
Channels = audioValues.Channels,
Format = audioValues.Encoding,
Extension = audioValues.Extension,
// Bitrate = ,
});
}
return(ret);
}
// http://dvd.sourceforge.net/dvdinfo/ifo.html#audatt
public static AudioValues ReadAudioSpecs(byte b0, byte b1, byte b5)
{
int byte0_high = (b0 & 0xF0) >> 4;
int byte0_low = (b0 & 0x0F);
int byte1_high = (b1 & 0xF0) >> 4;
int byte1_low = (b1 & 0x0F);
AudioValues result = new AudioValues();
switch (b5)
{
case 0: result.Extension = AudioExtension.Unspecified; break;
case 1: result.Extension = AudioExtension.Normal; break;
case 2: result.Extension = AudioExtension.For_visually_impaired; break;
case 3: result.Extension = AudioExtension.Director_s_comments; break;
case 4: result.Extension = AudioExtension.Alternate_director_s_comments; break;
}
result.LanguageTypePresent = (byte0_low & 0x04) == 0x04;
result.Channels = (byte1_low & 0x07) + 1;
if ((byte1_high & 0x03) == 0)
result.SampleRate = 0x30;
switch (byte0_high >> 1)
{
case 0: result.Encoding = AudioEncoding.AC3; break;
case 1: result.Encoding = AudioEncoding.Undefined; break;
case 2: result.Encoding = AudioEncoding.MPEG1; break;
case 3: result.Encoding = AudioEncoding.MPEG2; break;
case 4: result.Encoding = AudioEncoding.LPCM; break;
case 5: result.Encoding = AudioEncoding.Undefined; break;
case 6: result.Encoding = AudioEncoding.DTS; break;
case 7: result.Encoding = AudioEncoding.Undefined; break;
}
return result;
}
