private static IEnumerable <int> LoadRleData(WavStreamReader reader)
{
var list = new List <int>();
var smpCounter = 0;
var state = reader.ReadNext();
for (var i = 0; i < reader.Count; i++)
{
var sample = reader.ReadNext();
smpCounter++;
if ((state < 0 && sample < 0) ||
(state >= 0 && sample >= 0))
{
continue;
}
list.Add(smpCounter);
smpCounter = 0;
state = sample;
}
return(list);
}
private static IEnumerable <ITapeBlock> Load(Stream stream, int tactsPerSecond)
{
var reader = new WavStreamReader(stream);
var ratio = tactsPerSecond / (double)reader.Header.FmtSampleRate; // usually 3.5mhz / 44khz
var rleData = LoadRleData(reader);
var list = new List <TapeBlock>();
var pulses = new List <int>();
var blockTime = 0;
var blockCounter = 0;
foreach (var rle in rleData)
{
var len = (int)Math.Round(rle * ratio, MidpointRounding.AwayFromZero);
pulses.Add(len);
blockTime += len;
if (blockTime >= tactsPerSecond * 2)
{
var tb = new TapeBlock();
tb.Description = string.Format("WAV-{0:D3}", blockCounter++);
tb.Periods = new List <int>(pulses);
list.Add(tb);
blockTime = 0;
pulses.Clear();
}
}
if (pulses.Count > 0)
{
var tb = new TapeBlock();
tb.Description = string.Format("WAV-{0:D3}", blockCounter++);
tb.Periods = new List <int>(pulses);
list.Add(tb);
}
return(list);
}
public override void Deserialize(Stream stream)
{
m_tape.Blocks.Clear();
List<int> pulses = new List<int>();
WavStreamReader reader = new WavStreamReader(stream);
int rate = m_tape.TactsPerSecond / reader.Header.sampleRate; // usually 3.5mhz / 44khz
int smpCounter = 0;
int state = reader.ReadNext();
for (int i = 0; i < reader.Count; i++)
{
int sample = reader.ReadNext();
smpCounter++;
if ((state < 0 && sample < 0) || (state >= 0 && sample >= 0))
continue;
pulses.Add(smpCounter * rate);
smpCounter = 0;
state = sample;
}
pulses.Add(m_tape.TactsPerSecond / 10);
TapeBlock tb = new TapeBlock();
tb.Description = "WAV tape image";
tb.Periods = pulses;
m_tape.Blocks.Add(tb);
m_tape.Reset();
}
