public TimingAnalyzeData AnalyzeSong(string songPath, double blockLength)
{
_channel = Bass.CreateStream(songPath, 0, 0, BassFlags.Decode);
if (_channel == 0)
{
_channel = Bass.MusicLoad(songPath, 0, 0, BassFlags.Decode | BassFlags.Prescan, 0);
}
var songLength = Bass.ChannelBytes2Seconds(_channel, Bass.ChannelGetLength(_channel));
var ret = new TimingAnalyzeData();
for (var p = 0.0; (p + blockLength) < songLength; p += blockLength)
{
var bpm = AnalyzeBpm(p, p + blockLength);
while (bpm > 360 | bpm < 60)
{
if (bpm > 360)
{
bpm /= 2;
}
else if (bpm < 60)
{
bpm *= 2;
}
}
ret.AddBpm(new TimingPoint(p, bpm));
}
BassFx.BPMFree(_channel);
Bass.MusicFree(_channel);
Bass.StreamFree(_channel);
return(ret);
}
void OpenFile()
{
if (!_ofd.ShowDialog().Value)
{
return;
}
// free decode bpm stream and resources
BassFx.BPMFree(_bpmchan);
// free tempo, stream, music & bpm/beat callbacks
Bass.StreamFree(_chan);
Bass.MusicFree(_chan);
// create decode channel
_chan = Bass.CreateStream(_ofd.FileName, 0, 0, BassFlags.Decode);
if (_chan == 0)
{
_chan = Bass.MusicLoad(_ofd.FileName, 0, 0, BassFlags.MusicRamp | BassFlags.Prescan | BassFlags.Decode, 0);
}
if (_chan == 0)
{
// not a WAV/MP3 or MOD
Status = "Click Here to Open and Play a File...";
MessageBox.Show("Selected file couldn't be loaded!");
return;
}
// get channel info
Bass.ChannelGetInfo(_chan, out _info);
// create a new stream - decoded & resampled :)
if ((_chan = BassFx.TempoCreate(_chan, BassFlags.Loop | BassFlags.FxFreeSource)) == 0)
{
Status = "Click Here to Open and Play a File...";
MessageBox.Show("Couldn't create a resampled stream!");
Bass.StreamFree(_chan);
Bass.MusicFree(_chan);
return;
}
// update the button to show the loaded file name (without path)
Status = Path.GetFileName(_ofd.FileName);
SampleRate = _info.Frequency;
OnPropertyChanged(nameof(MinSampleRate));
OnPropertyChanged(nameof(MaxSampleRate));
// update tempo view
Tempo = 0;
// set the callback bpm and beat
IsBpmPeriod = _isBpmPeriod;
IsBeatPosition = _isBeatPosition;
// play new created stream
Bass.ChannelPlay(_chan);
// create bpmChan stream and get bpm value for BpmPeriod seconds from current position
var pos = Bass.ChannelBytes2Seconds(_chan, Bass.ChannelGetPosition(_chan));
var maxpos = Bass.ChannelBytes2Seconds(_chan, Bass.ChannelGetLength(_chan));
DecodingBPM(true, pos, pos + BpmPeriod >= maxpos ? maxpos - 1 : pos + BpmPeriod, _ofd.FileName);
}