public static string MakeSnaps(ref _song_profile sp, int _snapsize, int _snapcount, string _path, bool doConsecutive)
{
var SR = new SoundReader();
SR.OpenFile(_path);
int samplesDesired = _snapsize; //Math.Max(_snapsize, 65536);
sp.snap_size = _snapsize;
sp.snap_count = _snapcount;
sp.total_samples = SR.FR.Length;
sp.length = SR.FR.TotalTime.Seconds;
sp.path = _path;
long blockscount = (long)(_snapcount * ((float)sp.total_samples / 50000000));
if (!SR.CheckFile())
{
SR.CloseFile();
return "Wrong format";
}
SR.CloseFile();
using (SR.FR = new Mp3FileReader(_path))
{
for (int i = 0; i < blockscount; i++)
{
var data = SR.GetNextChunk(samplesDesired, SR.FR);
double[] leftd = data[0];
double[] rightd = data[1];
//for (int j = 0; j < 1; j++) ///////////
int seek_counter = 0;
//seek: pcm.Seek((i + 1) * (i + 1) * (i + 1) * blockscount * samplesDesired % (total_samples - samplesDesired), SeekOrigin.Begin);
seek:
if (!doConsecutive)
SR.SetPosition((long)(0.20 * sp.total_samples) + (long)(0.70 * sp.total_samples * i / blockscount));
else
SR.SetPosition((long)(0.20 * sp.total_samples) + i * _snapsize);
seek_counter++;
if ((leftd.Max(t => Math.Abs(t)) == 0) && (rightd.Max(t => Math.Abs(t)) == 0))
if (seek_counter > 4)
return "Too much silence";
else
{
blockscount++;
i++;
goto seek;
}
var pow_re_im = SoundProcessing.AmplitudeFromLR(_snapsize, leftd, rightd, 4.0, MWPreCalc);
sp.fft_snaps.Add(pow_re_im);
}
SR.CloseFile();
}
return "OK";
}
public static string MakeSnaps2(ref _song_profile sp, int _snapsize, int _snapcount, string _path, int overlap = 2, double lowpass = 4.0, bool fullnormalize = false)
{
var SR = new SoundReader();
var result = SR.OpenFile(_path);
if (result != "OK")
return result;
int samplesDesired = _snapsize;
sp.snap_size = _snapsize;
sp.snap_count = _snapcount;
sp.total_samples = SR.FR.Length;
sp.length = SR.FR.TotalTime.Seconds;
sp.path = _path;
int blockscount = (int)(_snapcount * ((float)sp.total_samples / (4 * 5 * 60 * 44100))); // 5 minutes song equivalent
blockscount = Math.Min(blockscount, 5 * 60 * 44100 / _snapsize); // haircut to 5 minutes long (maximum)
blockscount = Math.Min(blockscount, (int)(0.8 * _snapcount * ((float)sp.total_samples / (4 * 5 * 60 * 44100)))); // haircut to no more than 80% of song
if (!SR.CheckFile())
{
SR.CloseFile();
return "Wrong format";
}
SR.CloseFile();
using (SR.FR = new Mp3FileReader(_path))
{
SR.SetPosition((long)(0.20 * sp.total_samples));
double[][] alldata;
try
{
alldata = SR.GetNextChunk(samplesDesired * blockscount, SR.FR, fullnormalize);
}
catch (Exception E)
{
return E.Message;
}
for (int i = 0; i < (blockscount - 1) * overlap; i++)
{
double[] leftd = alldata[0];
double[] rightd = leftd;
var pow_re_im = SoundProcessing.AmplitudeFromLR2(_snapsize, leftd, Math.Max((int)(i * samplesDesired / overlap)-1, 0), samplesDesired, lowpass, MWPreCalc);
sp.fft_snaps.Add(pow_re_im);
}
SR.CloseFile();
}
return "OK";
}
