public unsafe static void Save(Song song, string filename, int sampleRate)
{
var advance = true;
var tempoCounter = 0;
var playPattern = 0;
var playNote = 0;
var speed = song.Speed;
var wavBytes = new List <byte>();
var apuIndex = NesApu.APU_WAV_EXPORT;
var dmcCallback = new NesApu.DmcReadDelegate(NesApu.DmcReadCallback);
NesApu.NesApuInit(apuIndex, sampleRate, dmcCallback);
NesApu.Reset(apuIndex);
var channels = new ChannelState[5]
{
new SquareChannelState(apuIndex, 0),
new SquareChannelState(apuIndex, 1),
new TriangleChannelState(apuIndex, 2),
new NoiseChannelState(apuIndex, 3),
new DPCMChannelState(apuIndex, 4)
};
for (int i = 0; i < 5; i++)
{
NesApu.NesApuEnableChannel(apuIndex, i, 1);
}
while (true)
{
// Advance to next note.
if (advance)
{
foreach (var channel in channels)
{
channel.ProcessEffects(song, ref playPattern, ref playNote, ref speed, false);
}
foreach (var channel in channels)
{
channel.Advance(song, playPattern, playNote);
}
advance = false;
}
// Update envelopes + APU registers.
foreach (var channel in channels)
{
channel.UpdateEnvelopes();
channel.UpdateAPU();
}
NesApu.NesApuEndFrame(apuIndex);
int numTotalSamples = NesApu.NesApuSamplesAvailable(apuIndex);
byte[] samples = new byte[numTotalSamples * 2];
fixed(byte *ptr = &samples[0])
{
NesApu.NesApuReadSamples(apuIndex, new IntPtr(ptr), numTotalSamples);
}
wavBytes.AddRange(samples);
int dummy1 = 0;
if (!PlayerBase.AdvanceTempo(song, speed, LoopMode.None, ref tempoCounter, ref playPattern, ref playNote, ref dummy1, ref advance))
{
break;
}
}
using (var file = new FileStream(filename, FileMode.Create))
{
var header = new WaveHeader();
// RIFF WAVE Header
header.chunkId[0] = (byte)'R';
header.chunkId[1] = (byte)'I';
header.chunkId[2] = (byte)'F';
header.chunkId[3] = (byte)'F';
header.format[0] = (byte)'W';
header.format[1] = (byte)'A';
header.format[2] = (byte)'V';
header.format[3] = (byte)'E';
// Format subchunk
header.subChunk1Id[0] = (byte)'f';
header.subChunk1Id[1] = (byte)'m';
header.subChunk1Id[2] = (byte)'t';
header.subChunk1Id[3] = (byte)' ';
header.audioFormat = 1; // FOR PCM
header.numChannels = 1; // 1 for MONO, 2 for stereo
header.sampleRate = sampleRate; // ie 44100 hertz, cd quality audio
header.bitsPerSample = 16; //
header.byteRate = header.sampleRate * header.numChannels * header.bitsPerSample / 8;
header.blockAlign = (short)(header.numChannels * header.bitsPerSample / 8);
// Data subchunk
header.subChunk2Id[0] = (byte)'d';
header.subChunk2Id[1] = (byte)'a';
header.subChunk2Id[2] = (byte)'t';
header.subChunk2Id[3] = (byte)'a';
// All sizes for later:
// chuckSize = 4 + (8 + subChunk1Size) + (8 + subChubk2Size)
// subChunk1Size is constanst, i'm using 16 and staying with PCM
// subChunk2Size = nSamples * nChannels * bitsPerSample/8
// Whenever a sample is added:
// chunkSize += (nChannels * bitsPerSample/8)
// subChunk2Size += (nChannels * bitsPerSample/8)
header.subChunk1Size = 16;
header.subChunk2Size = wavBytes.Count;
header.chunkSize = 4 + (8 + header.subChunk1Size) + (8 + header.subChunk2Size);
var headerBytes = new byte[sizeof(WaveHeader)];
Marshal.Copy(new IntPtr(&header), headerBytes, 0, headerBytes.Length);
file.Write(headerBytes, 0, headerBytes.Length);
file.Write(wavBytes.ToArray(), 0, wavBytes.Count);
}
}
unsafe void PlayerThread(object o)
{
var channels = new ChannelState[5]
{
new SquareChannelState(apuIndex, 0),
new SquareChannelState(apuIndex, 1),
new TriangleChannelState(apuIndex, 2),
new NoiseChannelState(apuIndex, 3),
new DPCMChannelState(apuIndex, 4)
};
var startInfo = (SongPlayerStartInfo)o;
var song = startInfo.song;
bool advance = true;
int tempoCounter = 0;
int playPattern = 0;
int playNote = 0;
int speed = song.Speed;
NesApu.Reset(apuIndex);
if (startInfo.frame != 0)
{
foreach (var channel in channels)
{
channel.StartSeeking();
}
while (playPattern * song.PatternLength + playNote != startInfo.frame)
{
foreach (var channel in channels)
{
channel.ProcessEffects(song, ref playPattern, ref playNote, ref speed);
channel.Advance(song, playPattern, playNote);
channel.UpdateEnvelopes();
channel.UpdateAPU();
}
// Tempo/speed logic.
tempoCounter += song.Tempo * 256 / 150; // NTSC
if ((tempoCounter >> 8) == speed)
{
tempoCounter -= (speed << 8);
if (++playNote == song.PatternLength)
{
playNote = 0;
if (++playPattern == song.Length)
{
playPattern = 0;
}
}
}
}
foreach (var channel in channels)
{
channel.StopSeeking();
}
}
var waitEvents = new WaitHandle[] { stopEvent, frameEvent };
while (true)
{
int idx = WaitHandle.WaitAny(waitEvents);
if (idx == 0)
{
break;
}
// Advance to next note.
if (advance)
{
foreach (var channel in channels)
{
channel.ProcessEffects(song, ref playPattern, ref playNote, ref speed);
channel.Advance(song, playPattern, playNote);
}
advance = false;
}
// Update envelopes + APU registers.
foreach (var channel in channels)
{
channel.UpdateEnvelopes();
channel.UpdateAPU();
}
// Mute.
for (int i = 0; i < 5; i++)
{
NesApu.NesApuEnableChannel(apuIndex, i, (channelMask & (1 << i)));
}
EndFrameAndQueueSamples();
// Tempo/speed logic.
tempoCounter += song.Tempo * 256 / 150; // NTSC
if ((tempoCounter >> 8) == speed)
{
tempoCounter -= (speed << 8);
if (++playNote == song.PatternLength)
{
playNote = 0;
if (loopMode != LoopMode.Pattern)
{
if (++playPattern == song.Length)
{
if (loopMode == LoopMode.None)
{
break;
}
playPattern = 0;
}
}
}
playFrame = playPattern * song.PatternLength + playNote;
advance = true;
}
}
xaudio2Stream.Stop();
while (sampleQueue.TryDequeue(out _))
{
;
}
}
unsafe void PlayerThread(object o)
{
var channels = new ChannelState[5]
{
new SquareChannelState(apuIndex, 0),
new SquareChannelState(apuIndex, 1),
new TriangleChannelState(apuIndex, 2),
new NoiseChannelState(apuIndex, 3),
new DPCMChannelState(apuIndex, 4)
};
var startInfo = (SongPlayerStartInfo)o;
var song = startInfo.song;
bool advance = true;
int tempoCounter = 0;
int playPattern = 0;
int playNote = 0;
int speed = song.Speed;
NesApu.Reset(apuIndex);
if (startInfo.frame != 0)
{
foreach (var channel in channels)
{
channel.StartSeeking();
}
while (playPattern * song.PatternLength + playNote != startInfo.frame)
{
foreach (var channel in channels)
{
channel.ProcessEffects(song, ref playPattern, ref playNote, ref speed);
}
foreach (var channel in channels)
{
channel.Advance(song, playPattern, playNote);
channel.UpdateEnvelopes();
channel.UpdateAPU();
}
int dummy1 = 0;
bool dummy2 = false;
if (!AdvanceTempo(song, speed, LoopMode.None, ref tempoCounter, ref playPattern, ref playNote, ref dummy1, ref dummy2))
{
break;
}
}
foreach (var channel in channels)
{
channel.StopSeeking();
}
}
var waitEvents = new WaitHandle[] { stopEvent, frameEvent };
while (true)
{
int idx = WaitHandle.WaitAny(waitEvents);
if (idx == 0)
{
break;
}
// Advance to next note.
if (advance)
{
// We process the effects before since one channel may have
// a skip/jump and we need to process that first before advancing
// the song.
foreach (var channel in channels)
{
channel.ProcessEffects(song, ref playPattern, ref playNote, ref speed);
}
foreach (var channel in channels)
{
channel.Advance(song, playPattern, playNote);
}
advance = false;
}
// Update envelopes + APU registers.
foreach (var channel in channels)
{
channel.UpdateEnvelopes();
channel.UpdateAPU();
}
// Mute.
for (int i = 0; i < 5; i++)
{
NesApu.NesApuEnableChannel(apuIndex, i, (channelMask & (1 << i)));
}
EndFrameAndQueueSamples();
if (!AdvanceTempo(song, speed, loopMode, ref tempoCounter, ref playPattern, ref playNote, ref playFrame, ref advance))
{
break;
}
}
audioStream.Stop();
while (sampleQueue.TryDequeue(out _))
{
;
}
}
unsafe void PlayerThread(object o)
{
var channels = new ChannelState[5]
{
new SquareChannelState(apuIndex, 0),
new SquareChannelState(apuIndex, 1),
new TriangleChannelState(apuIndex, 2),
new NoiseChannelState(apuIndex, 3),
new DPCMChannelState(apuIndex, 4)
};
var activeChannel = -1;
var waitEvents = new WaitHandle[] { stopEvent, frameEvent };
NesApu.Reset(apuIndex);
for (int i = 0; i < 5; i++)
{
NesApu.NesApuEnableChannel(apuIndex, i, 0);
}
while (true)
{
int idx = WaitHandle.WaitAny(waitEvents);
if (idx == 0)
{
break;
}
if (!noteQueue.IsEmpty)
{
PlayerNote lastNote = new PlayerNote();
while (noteQueue.TryDequeue(out PlayerNote note))
{
lastNote = note;
}
activeChannel = lastNote.channel;
if (activeChannel >= 0)
{
channels[activeChannel].PlayNote(lastNote.note);
}
for (int i = 0; i < 5; i++)
{
NesApu.NesApuEnableChannel(apuIndex, i, i == activeChannel ? 1 : 0);
}
}
if (activeChannel >= 0)
{
channels[activeChannel].UpdateEnvelopes();
channels[activeChannel].UpdateAPU();
for (int i = 0; i < Envelope.Max; i++)
{
envelopeFrames[i] = channels[activeChannel].GetEnvelopeFrame(i);
}
}
else
{
for (int i = 0; i < Envelope.Max; i++)
{
envelopeFrames[i] = 0;
}
foreach (var channel in channels)
{
channel.ClearNote();
}
}
EndFrameAndQueueSamples();
}
xaudio2Stream.Stop();
while (sampleQueue.TryDequeue(out _))
{
;
}
}