bool CheckForAudio(string path)
{
FFMpeg ffmpeg = new FFMpeg();
var qa = ffmpeg.QueryAudio(path);
return(qa.IsAudio);
}
public static void Extract(Disc disc, string path, string filebase)
{
var dsr = new DiscSectorReader(disc);
bool confirmed = false;
var tracks = disc.Session1.Tracks;
foreach (var track in tracks)
{
if (!track.IsAudio)
continue;
int trackLength = track.NextTrack.LBA - track.LBA;
var waveData = new byte[trackLength * 2352];
int startLba = track.LBA;
for (int sector = 0; sector < trackLength; sector++)
dsr.ReadLBA_2352(startLba + sector, waveData, sector * 2352);
string mp3Path = string.Format("{0} - Track {1:D2}.mp3", Path.Combine(path, filebase), track.Number);
if (File.Exists(mp3Path))
{
if (!confirmed)
{
var dr = MessageBox.Show("This file already exists. Do you want extraction to proceed overwriting files, or cancel the entire operation immediately?", "File already exists", MessageBoxButtons.OKCancel);
if (dr == DialogResult.Cancel) return;
confirmed = true;
}
File.Delete(mp3Path);
}
string tempfile = Path.GetTempFileName();
try
{
File.WriteAllBytes(tempfile, waveData);
var ffmpeg = new FFMpeg();
ffmpeg.Run("-f", "s16le", "-ar", "44100", "-ac", "2", "-i", tempfile, "-f", "mp3", "-ab", "192k", mp3Path);
}
finally
{
File.Delete(tempfile);
}
}
}
void FromCueInternal(Cue cue, string cueDir, CueBinPrefs prefs)
{
//TODO - add cue directory to CueBinPrefs???? could make things cleaner...
var session = new DiscTOC.Session {num = 1};
TOC.Sessions.Add(session);
var pregap_sector = new Sector_Zero();
int curr_track = 1;
foreach (var cue_file in cue.Files)
{
//structural validation
if (cue_file.Tracks.Count < 1) throw new Cue.CueBrokenException("`You must specify at least one track per file.`");
string blobPath = Path.Combine(cueDir, cue_file.Path);
if (CueFileResolver.ContainsKey(cue_file.Path))
blobPath = CueFileResolver[cue_file.Path];
int blob_sectorsize = Cue.BINSectorSizeForTrackType(cue_file.Tracks[0].TrackType);
int blob_length_aba;
long blob_length_bytes;
IBlob cue_blob;
//try any way we can to acquire a file
if (!File.Exists(blobPath) && prefs.ExtensionAware)
{
blobPath = FindAlternateExtensionFile(blobPath, prefs.CaseSensitive, cueDir);
}
if (!File.Exists(blobPath))
throw new DiscReferenceException(blobPath, "");
//some simple rules to mutate the file type if we received something fishy
string blobPathExt = Path.GetExtension(blobPath).ToLower();
if (blobPathExt == ".ape") cue_file.FileType = Cue.CueFileType.Wave;
if (blobPathExt == ".mp3") cue_file.FileType = Cue.CueFileType.Wave;
if (blobPathExt == ".mpc") cue_file.FileType = Cue.CueFileType.Wave;
if (blobPathExt == ".flac") cue_file.FileType = Cue.CueFileType.Wave;
if (blobPathExt == ".ecm") cue_file.FileType = Cue.CueFileType.ECM;
if (cue_file.FileType == Cue.CueFileType.Binary || cue_file.FileType == Cue.CueFileType.Unspecified)
{
//make a blob for the file
Blob_RawFile blob = new Blob_RawFile {PhysicalPath = blobPath};
Blobs.Add(blob);
blob_length_aba = (int)(blob.Length / blob_sectorsize);
blob_length_bytes = blob.Length;
cue_blob = blob;
}
else if (cue_file.FileType == Cue.CueFileType.ECM)
{
if (!Blob_ECM.IsECM(blobPath))
{
throw new DiscReferenceException(blobPath, "an ECM file was specified or detected, but it isn't a valid ECM file. You've got issues. Consult your iso vendor.");
}
Blob_ECM blob = new Blob_ECM();
Blobs.Add(blob);
blob.Parse(blobPath);
cue_blob = blob;
blob_length_aba = (int)(blob.Length / blob_sectorsize);
blob_length_bytes = blob.Length;
}
else if (cue_file.FileType == Cue.CueFileType.Wave)
{
Blob_WaveFile blob = new Blob_WaveFile();
Blobs.Add(blob);
try
{
//check whether we can load the wav directly
bool loaded = false;
if (File.Exists(blobPath) && Path.GetExtension(blobPath).ToUpper() == ".WAV")
{
try
{
blob.Load(blobPath);
loaded = true;
}
catch
{
}
}
//if that didnt work or wasnt possible, try loading it through ffmpeg
if (!loaded)
{
FFMpeg ffmpeg = new FFMpeg();
if (!ffmpeg.QueryServiceAvailable())
{
throw new DiscReferenceException(blobPath, "No decoding service was available (make sure ffmpeg.exe is available. even though this may be a wav, ffmpeg is used to load oddly formatted wave files. If you object to this, please send us a note and we'll see what we can do. It shouldn't be too hard.)");
}
AudioDecoder dec = new AudioDecoder();
byte[] buf = dec.AcquireWaveData(blobPath);
blob.Load(new MemoryStream(buf));
WasSlowLoad = true;
}
}
catch (Exception ex)
{
throw new DiscReferenceException(blobPath, ex);
}
blob_length_aba = (int)(blob.Length / blob_sectorsize);
blob_length_bytes = blob.Length;
cue_blob = blob;
}
else throw new Exception("Internal error - Unhandled cue blob type");
//TODO - make CueTimestamp better, and also make it a struct, and also just make it DiscTimestamp
//start timekeeping for the blob. every time we hit an index, this will advance
int blob_timestamp = 0;
//because we can have different size sectors in a blob, we need to keep a file cursor within the blob
long blob_cursor = 0;
//the aba that this cue blob starts on
int blob_disc_aba_start = Sectors.Count;
//for each track within the file, create an index 0 if it is missing.
//also check to make sure there is an index 1
for (int t = 0; t < cue_file.Tracks.Count; t++)
{
var cue_track = cue_file.Tracks[t];
if (!cue_track.Indexes.ContainsKey(1))
throw new Cue.CueBrokenException("Track was missing an index 01");
if (!cue_track.Indexes.ContainsKey(0))
{
//index 0 will default to the same as index 1.
//i am not sure whether it is valid to have two indexes with the same timestamp.
//we will do this to simplify some processing, but we can purge it in a later pass if we need to.
var cti = new Cue.CueTrackIndex(0);
cue_track.Indexes[0] = cti;
cti.Timestamp = cue_track.Indexes[1].Timestamp;
}
}
//validate that the first index in the file is 00:00:00
if (cue_file.Tracks[0].Indexes[0].Timestamp.ABA != 0) throw new Cue.CueBrokenException("`The first index of a blob must start at 00:00:00.`");
//for each track within the file:
for (int t = 0; t < cue_file.Tracks.Count; t++)
{
var cue_track = cue_file.Tracks[t];
//record the disc ABA that this track started on
int track_disc_aba_start = Sectors.Count;
//record the pregap location. it will default to the start of the track unless we supplied a pregap command
int track_disc_pregap_aba = track_disc_aba_start;
int blob_track_start = blob_timestamp;
//once upon a time we had a check here to prevent a single blob from containing variant sector sizes. but we support that now.
//check integrity of track sequence and setup data structures
//TODO - check for skipped tracks in cue parser instead
if (cue_track.TrackNum != curr_track) throw new Cue.CueBrokenException("Found a cue with skipped tracks");
var toc_track = new DiscTOC.Track();
toc_track.num = curr_track;
toc_track.TrackType = cue_track.TrackType;
session.Tracks.Add(toc_track);
if (curr_track == 1)
{
if (cue_track.PreGap.ABA != 0)
throw new InvalidOperationException("not supported (yet): cue files with track 1 pregaps");
//but now we add one anyway, because every existing cue+bin seems to implicitly specify this
cue_track.PreGap = new Timestamp(150);
}
//check whether a pregap is requested.
//this causes empty sectors to get generated without consuming data from the blob
if (cue_track.PreGap.ABA > 0)
{
for (int i = 0; i < cue_track.PreGap.ABA; i++)
{
Sectors.Add(new SectorEntry(pregap_sector));
}
}
//look ahead to the next track's index 1 so we can see how long this track's last index is
//or, for the last track, use the length of the file
int track_length_aba;
if (t == cue_file.Tracks.Count - 1)
track_length_aba = blob_length_aba - blob_timestamp;
else track_length_aba = cue_file.Tracks[t + 1].Indexes[1].Timestamp.ABA - blob_timestamp;
//toc_track.length_aba = track_length_aba; //xxx
//find out how many indexes we have
int num_indexes = 0;
for (num_indexes = 0; num_indexes <= 99; num_indexes++)
if (!cue_track.Indexes.ContainsKey(num_indexes)) break;
//for each index, calculate length of index and then emit it
for (int index = 0; index < num_indexes; index++)
{
bool is_last_index = index == num_indexes - 1;
//install index into hierarchy
var toc_index = new DiscTOC.Index {num = index};
toc_track.Indexes.Add(toc_index);
if (index == 0)
{
toc_index.aba = track_disc_pregap_aba - (cue_track.Indexes[1].Timestamp.ABA - cue_track.Indexes[0].Timestamp.ABA);
}
else toc_index.aba = Sectors.Count;
//calculate length of the index
//if it is the last index then we use our calculation from before, otherwise we check the next index
int index_length_aba;
if (is_last_index)
index_length_aba = track_length_aba - (blob_timestamp - blob_track_start);
else index_length_aba = cue_track.Indexes[index + 1].Timestamp.ABA - blob_timestamp;
//emit sectors
for (int aba = 0; aba < index_length_aba; aba++)
{
bool is_last_aba_in_index = (aba == index_length_aba - 1);
bool is_last_aba_in_track = is_last_aba_in_index && is_last_index;
switch (cue_track.TrackType)
{
case ETrackType.Audio: //all 2352 bytes are present
case ETrackType.Mode1_2352: //2352 bytes are present, containing 2048 bytes of user data as well as ECM
case ETrackType.Mode2_2352: //2352 bytes are present, containing the entirety of a mode2 sector (could be form0,1,2)
{
//these cases are all 2352 bytes
//in all these cases, either no ECM is present or ECM is provided.
//so we just emit a Sector_Raw
Sector_RawBlob sector_rawblob = new Sector_RawBlob
{
Blob = cue_blob,
Offset = blob_cursor
};
blob_cursor += 2352;
Sector_Mode1_or_Mode2_2352 sector_raw;
if(cue_track.TrackType == ETrackType.Mode1_2352)
sector_raw = new Sector_Mode1_2352();
else if (cue_track.TrackType == ETrackType.Audio)
sector_raw = new Sector_Mode1_2352(); //TODO should probably make a new sector adapter which errors if 2048B are requested
else if (cue_track.TrackType == ETrackType.Mode2_2352)
sector_raw = new Sector_Mode2_2352();
else throw new InvalidOperationException();
sector_raw.BaseSector = sector_rawblob;
Sectors.Add(new SectorEntry(sector_raw));
break;
}
case ETrackType.Mode1_2048:
//2048 bytes are present. ECM needs to be generated to create a full sector
{
//ECM needs to know the sector number so we have to record that here
int curr_disc_aba = Sectors.Count;
var sector_2048 = new Sector_Mode1_2048(curr_disc_aba + 150)
{
Blob = new ECMCacheBlob(cue_blob),
Offset = blob_cursor
};
blob_cursor += 2048;
Sectors.Add(new SectorEntry(sector_2048));
break;
}
} //switch(TrackType)
//we've emitted an ABA, so consume it from the blob
blob_timestamp++;
} //aba emit loop
} //index loop
//check whether a postgap is requested. if it is, we need to generate silent sectors
for (int i = 0; i < cue_track.PostGap.ABA; i++)
{
Sectors.Add(new SectorEntry(pregap_sector));
}
//we're done with the track now.
//record its length:
toc_track.length_aba = Sectors.Count - toc_track.Indexes[1].aba;
curr_track++;
//if we ran off the end of the blob, pad it with zeroes, I guess
if (blob_cursor > blob_length_bytes)
{
//mutate the blob to an encapsulating Blob_ZeroPadAdapter
Blobs[Blobs.Count - 1] = new Blob_ZeroPadAdapter(Blobs[Blobs.Count - 1], blob_length_bytes, blob_cursor - blob_length_bytes);
}
} //track loop
} //file loop
//finally, analyze the length of the sessions and the entire disc by summing the lengths of the tracks
//this is a little more complex than it looks, because the length of a thing is not determined by summing it
//but rather by the difference in abas between start and end
TOC.length_aba = 0;
foreach (var toc_session in TOC.Sessions)
{
var firstTrack = toc_session.Tracks[0];
//track 0, index 0 is actually -150. but cue sheets will never say that
//firstTrack.Indexes[0].aba -= 150;
var lastTrack = toc_session.Tracks[toc_session.Tracks.Count - 1];
session.length_aba = lastTrack.Indexes[1].aba + lastTrack.length_aba - firstTrack.Indexes[0].aba;
TOC.length_aba += toc_session.length_aba;
}
}
bool CheckForAudio(string path)
{
FFMpeg ffmpeg = new FFMpeg();
var qa = ffmpeg.QueryAudio(path);
return qa.IsAudio;
}
void FromCueInternal(Cue cue, string cueDir, CueBinPrefs prefs)
{
//TODO - add cue directory to CueBinPrefs???? could make things cleaner...
var session = new DiscTOC.Session {
num = 1
};
TOC.Sessions.Add(session);
var pregap_sector = new Sector_Zero();
int curr_track = 1;
foreach (var cue_file in cue.Files)
{
//structural validation
if (cue_file.Tracks.Count < 1)
{
throw new Cue.CueBrokenException("`You must specify at least one track per file.`");
}
string blobPath = Path.Combine(cueDir, cue_file.Path);
if (CueFileResolver.ContainsKey(cue_file.Path))
{
blobPath = CueFileResolver[cue_file.Path];
}
int blob_sectorsize = Cue.BINSectorSizeForTrackType(cue_file.Tracks[0].TrackType);
int blob_length_aba;
long blob_length_bytes;
IBlob cue_blob;
//try any way we can to acquire a file
if (!File.Exists(blobPath) && prefs.ExtensionAware)
{
blobPath = FindAlternateExtensionFile(blobPath, prefs.CaseSensitive, cueDir);
}
if (!File.Exists(blobPath))
{
throw new DiscReferenceException(blobPath, "");
}
//some simple rules to mutate the file type if we received something fishy
string blobPathExt = Path.GetExtension(blobPath).ToLower();
if (blobPathExt == ".ape")
{
cue_file.FileType = Cue.CueFileType.Wave;
}
if (blobPathExt == ".mp3")
{
cue_file.FileType = Cue.CueFileType.Wave;
}
if (blobPathExt == ".mpc")
{
cue_file.FileType = Cue.CueFileType.Wave;
}
if (blobPathExt == ".flac")
{
cue_file.FileType = Cue.CueFileType.Wave;
}
if (blobPathExt == ".ecm")
{
cue_file.FileType = Cue.CueFileType.ECM;
}
if (cue_file.FileType == Cue.CueFileType.Binary || cue_file.FileType == Cue.CueFileType.Unspecified)
{
//make a blob for the file
Blob_RawFile blob = new Blob_RawFile {
PhysicalPath = blobPath
};
Blobs.Add(blob);
blob_length_aba = (int)(blob.Length / blob_sectorsize);
blob_length_bytes = blob.Length;
cue_blob = blob;
}
else if (cue_file.FileType == Cue.CueFileType.ECM)
{
if (!Blob_ECM.IsECM(blobPath))
{
throw new DiscReferenceException(blobPath, "an ECM file was specified or detected, but it isn't a valid ECM file. You've got issues. Consult your iso vendor.");
}
Blob_ECM blob = new Blob_ECM();
Blobs.Add(blob);
blob.Parse(blobPath);
cue_blob = blob;
blob_length_aba = (int)(blob.Length / blob_sectorsize);
blob_length_bytes = blob.Length;
}
else if (cue_file.FileType == Cue.CueFileType.Wave)
{
Blob_WaveFile blob = new Blob_WaveFile();
Blobs.Add(blob);
try
{
//check whether we can load the wav directly
bool loaded = false;
if (File.Exists(blobPath) && Path.GetExtension(blobPath).ToUpper() == ".WAV")
{
try
{
blob.Load(blobPath);
loaded = true;
}
catch
{
}
}
//if that didnt work or wasnt possible, try loading it through ffmpeg
if (!loaded)
{
FFMpeg ffmpeg = new FFMpeg();
if (!ffmpeg.QueryServiceAvailable())
{
throw new DiscReferenceException(blobPath, "No decoding service was available (make sure ffmpeg.exe is available. even though this may be a wav, ffmpeg is used to load oddly formatted wave files. If you object to this, please send us a note and we'll see what we can do. It shouldn't be too hard.)");
}
AudioDecoder dec = new AudioDecoder();
byte[] buf = dec.AcquireWaveData(blobPath);
blob.Load(new MemoryStream(buf));
WasSlowLoad = true;
}
}
catch (Exception ex)
{
throw new DiscReferenceException(blobPath, ex);
}
blob_length_aba = (int)(blob.Length / blob_sectorsize);
blob_length_bytes = blob.Length;
cue_blob = blob;
}
else
{
throw new Exception("Internal error - Unhandled cue blob type");
}
//TODO - make CueTimestamp better, and also make it a struct, and also just make it DiscTimestamp
//start timekeeping for the blob. every time we hit an index, this will advance
int blob_timestamp = 0;
//because we can have different size sectors in a blob, we need to keep a file cursor within the blob
long blob_cursor = 0;
//the aba that this cue blob starts on
int blob_disc_aba_start = Sectors.Count;
//for each track within the file, create an index 0 if it is missing.
//also check to make sure there is an index 1
for (int t = 0; t < cue_file.Tracks.Count; t++)
{
var cue_track = cue_file.Tracks[t];
if (!cue_track.Indexes.ContainsKey(1))
{
throw new Cue.CueBrokenException("Track was missing an index 01");
}
if (!cue_track.Indexes.ContainsKey(0))
{
//index 0 will default to the same as index 1.
//i am not sure whether it is valid to have two indexes with the same timestamp.
//we will do this to simplify some processing, but we can purge it in a later pass if we need to.
var cti = new Cue.CueTrackIndex(0);
cue_track.Indexes[0] = cti;
cti.Timestamp = cue_track.Indexes[1].Timestamp;
}
}
//validate that the first index in the file is 00:00:00
if (cue_file.Tracks[0].Indexes[0].Timestamp.ABA != 0)
{
throw new Cue.CueBrokenException("`The first index of a blob must start at 00:00:00.`");
}
//for each track within the file:
for (int t = 0; t < cue_file.Tracks.Count; t++)
{
var cue_track = cue_file.Tracks[t];
//record the disc ABA that this track started on
int track_disc_aba_start = Sectors.Count;
//record the pregap location. it will default to the start of the track unless we supplied a pregap command
int track_disc_pregap_aba = track_disc_aba_start;
int blob_track_start = blob_timestamp;
//once upon a time we had a check here to prevent a single blob from containing variant sector sizes. but we support that now.
//check integrity of track sequence and setup data structures
//TODO - check for skipped tracks in cue parser instead
if (cue_track.TrackNum != curr_track)
{
throw new Cue.CueBrokenException("Found a cue with skipped tracks");
}
var toc_track = new DiscTOC.Track();
toc_track.num = curr_track;
toc_track.TrackType = cue_track.TrackType;
session.Tracks.Add(toc_track);
if (curr_track == 1)
{
if (cue_track.PreGap.ABA != 0)
{
throw new InvalidOperationException("not supported (yet): cue files with track 1 pregaps");
}
//but now we add one anyway, because every existing cue+bin seems to implicitly specify this
cue_track.PreGap = new Timestamp(150);
}
//check whether a pregap is requested.
//this causes empty sectors to get generated without consuming data from the blob
if (cue_track.PreGap.ABA > 0)
{
for (int i = 0; i < cue_track.PreGap.ABA; i++)
{
Sectors.Add(new SectorEntry(pregap_sector));
}
}
//look ahead to the next track's index 1 so we can see how long this track's last index is
//or, for the last track, use the length of the file
int track_length_aba;
if (t == cue_file.Tracks.Count - 1)
{
track_length_aba = blob_length_aba - blob_timestamp;
}
else
{
track_length_aba = cue_file.Tracks[t + 1].Indexes[1].Timestamp.ABA - blob_timestamp;
}
//toc_track.length_aba = track_length_aba; //xxx
//find out how many indexes we have
int num_indexes = 0;
for (num_indexes = 0; num_indexes <= 99; num_indexes++)
{
if (!cue_track.Indexes.ContainsKey(num_indexes))
{
break;
}
}
//for each index, calculate length of index and then emit it
for (int index = 0; index < num_indexes; index++)
{
bool is_last_index = index == num_indexes - 1;
//install index into hierarchy
var toc_index = new DiscTOC.Index {
num = index
};
toc_track.Indexes.Add(toc_index);
if (index == 0)
{
toc_index.aba = track_disc_pregap_aba - (cue_track.Indexes[1].Timestamp.ABA - cue_track.Indexes[0].Timestamp.ABA);
}
else
{
toc_index.aba = Sectors.Count;
}
//calculate length of the index
//if it is the last index then we use our calculation from before, otherwise we check the next index
int index_length_aba;
if (is_last_index)
{
index_length_aba = track_length_aba - (blob_timestamp - blob_track_start);
}
else
{
index_length_aba = cue_track.Indexes[index + 1].Timestamp.ABA - blob_timestamp;
}
//emit sectors
for (int aba = 0; aba < index_length_aba; aba++)
{
bool is_last_aba_in_index = (aba == index_length_aba - 1);
bool is_last_aba_in_track = is_last_aba_in_index && is_last_index;
switch (cue_track.TrackType)
{
case ETrackType.Audio: //all 2352 bytes are present
case ETrackType.Mode1_2352: //2352 bytes are present, containing 2048 bytes of user data as well as ECM
case ETrackType.Mode2_2352: //2352 bytes are present, containing the entirety of a mode2 sector (could be form0,1,2)
{
//these cases are all 2352 bytes
//in all these cases, either no ECM is present or ECM is provided.
//so we just emit a Sector_Raw
Sector_RawBlob sector_rawblob = new Sector_RawBlob
{
Blob = cue_blob,
Offset = blob_cursor
};
blob_cursor += 2352;
Sector_Mode1_or_Mode2_2352 sector_raw;
if (cue_track.TrackType == ETrackType.Mode1_2352)
{
sector_raw = new Sector_Mode1_2352();
}
else if (cue_track.TrackType == ETrackType.Audio)
{
sector_raw = new Sector_Mode1_2352(); //TODO should probably make a new sector adapter which errors if 2048B are requested
}
else if (cue_track.TrackType == ETrackType.Mode2_2352)
{
sector_raw = new Sector_Mode2_2352();
}
else
{
throw new InvalidOperationException();
}
sector_raw.BaseSector = sector_rawblob;
Sectors.Add(new SectorEntry(sector_raw));
break;
}
case ETrackType.Mode1_2048:
//2048 bytes are present. ECM needs to be generated to create a full sector
{
//ECM needs to know the sector number so we have to record that here
int curr_disc_aba = Sectors.Count;
var sector_2048 = new Sector_Mode1_2048(curr_disc_aba + 150)
{
Blob = new ECMCacheBlob(cue_blob),
Offset = blob_cursor
};
blob_cursor += 2048;
Sectors.Add(new SectorEntry(sector_2048));
break;
}
} //switch(TrackType)
//we've emitted an ABA, so consume it from the blob
blob_timestamp++;
} //aba emit loop
} //index loop
//check whether a postgap is requested. if it is, we need to generate silent sectors
for (int i = 0; i < cue_track.PostGap.ABA; i++)
{
Sectors.Add(new SectorEntry(pregap_sector));
}
//we're done with the track now.
//record its length:
toc_track.length_aba = Sectors.Count - toc_track.Indexes[1].aba;
curr_track++;
//if we ran off the end of the blob, pad it with zeroes, I guess
if (blob_cursor > blob_length_bytes)
{
//mutate the blob to an encapsulating Blob_ZeroPadAdapter
Blobs[Blobs.Count - 1] = new Blob_ZeroPadAdapter(Blobs[Blobs.Count - 1], blob_length_bytes, blob_cursor - blob_length_bytes);
}
} //track loop
} //file loop
//finally, analyze the length of the sessions and the entire disc by summing the lengths of the tracks
//this is a little more complex than it looks, because the length of a thing is not determined by summing it
//but rather by the difference in abas between start and end
TOC.length_aba = 0;
foreach (var toc_session in TOC.Sessions)
{
var firstTrack = toc_session.Tracks[0];
//track 0, index 0 is actually -150. but cue sheets will never say that
//firstTrack.Indexes[0].aba -= 150;
var lastTrack = toc_session.Tracks[toc_session.Tracks.Count - 1];
session.length_aba = lastTrack.Indexes[1].aba + lastTrack.length_aba - firstTrack.Indexes[0].aba;
TOC.length_aba += toc_session.length_aba;
}
}