public Project Load(string filename, int songIndex, int duration, int patternLength, int startFrame, bool removeIntroSilence, bool reverseDpcm, bool preserveDpcmPad)
{
nsf = NsfOpen(filename);
if (nsf == IntPtr.Zero)
{
Log.LogMessage(LogSeverity.Error, "Error opening NSF. File may be corrupted or may be a NSF2 using advanced features such as IRQ which are not supported at the moment.");
return(null);
}
var trackCount = NsfGetTrackCount(nsf);
if (songIndex < 0 || songIndex > trackCount)
{
return(null);
}
preserveDpcmPadding = preserveDpcmPad;
var palSource = (NsfIsPal(nsf) & 1) == 1;
var numFrames = duration * (palSource ? 50 : 60);
project = new Project();
project.Name = Marshal.PtrToStringAnsi(NsfGetTitle(nsf));
project.Author = Marshal.PtrToStringAnsi(NsfGetArtist(nsf));
project.Copyright = Marshal.PtrToStringAnsi(NsfGetCopyright(nsf));
project.PalMode = palSource;
// Our expansion mask is the same as NSF.
var expansionMask = NsfGetExpansion(nsf);
// The 2 upper bits of the mask need to be zero, we dont support these.
if (expansionMask != (expansionMask & ExpansionType.AllMask))
{
Log.LogMessage(LogSeverity.Error, "NSF uses unknown or unsupported expansion chips, aborting.");
NsfClose(nsf);
return(null);
}
var numN163Channels = (expansionMask & ExpansionType.N163Mask) != 0 ? GetNumNamcoChannels(filename, songIndex, numFrames) : 1;
project.SetExpansionAudioMask(expansionMask, numN163Channels);
var songName = Marshal.PtrToStringAnsi(NsfGetTrackName(nsf, songIndex));
song = project.CreateSong(string.IsNullOrEmpty(songName) ? $"Song {songIndex + 1}" : songName);
channelStates = new ChannelState[song.Channels.Length];
NsfSetTrack(nsf, songIndex);
song.ChangeFamiStudioTempoGroove(new[] { 1 }, false);
song.SetDefaultPatternLength(patternLength);
for (int i = 0; i < song.Channels.Length; i++)
{
channelStates[i] = new ChannelState();
}
var foundFirstNote = !removeIntroSilence;
var p = 0;
var n = 0;
var f = startFrame;
for (int i = 0; i < numFrames; i++)
{
p = f / song.PatternLength;
n = f % song.PatternLength;
if (p >= Song.MaxLength - 1)
{
break;
}
var playCalled = 0;
var waitFrameCount = 0;
do
{
playCalled = NsfRunFrame(nsf);
if (++waitFrameCount == 1000)
{
Log.LogMessage(LogSeverity.Error, "NSF did not call PLAY after 1000 frames, aborting.");
NsfClose(nsf);
return(null);
}
}while (playCalled == 0);
for (int c = 0; c < song.Channels.Length; c++)
{
foundFirstNote |= UpdateChannel(p, n, song.Channels[c], channelStates[c]);
}
if (foundFirstNote)
{
f++;
}
else
{
// Reset everything until we find our first note.
project.DeleteAllInstruments();
project.DeleteAllSamples();
for (int c = 0; c < song.Channels.Length; c++)
{
channelStates[c] = new ChannelState();
}
}
}
song.SetLength(p + 1);
NsfClose(nsf);
var factors = Utils.GetFactors(song.PatternLength, FamiStudioTempoUtils.MaxNoteLength);
if (factors.Length > 0)
{
var noteLen = factors[0];
// Look for a factor that generates a note length < 10 and gives a pattern length that is a multiple of 16.
foreach (var factor in factors)
{
if (factor <= 10)
{
noteLen = factor;
if (((song.PatternLength / noteLen) % 16) == 0)
{
break;
}
}
}
song.ChangeFamiStudioTempoGroove(new[] { noteLen }, false);
}
else
{
song.ChangeFamiStudioTempoGroove(new[] { 1 }, false);
}
song.SetSensibleBeatLength();
song.ConvertToCompoundNotes();
song.DeleteEmptyPatterns();
song.UpdatePatternStartNotes();
song.InvalidateCumulativePatternCache();
project.DeleteUnusedInstruments();
foreach (var sample in project.Samples)
{
sample.ReverseBits = reverseDpcm;
}
return(project);
}
