internal static float calculateBpm()
{
int audioStreamDecode = Bass.BASS_StreamCreateFile(audioFilename, 0, 0,
BASSFlag.BASS_STREAM_DECODE);
tmpCount = 0;
BassFx.BASS_FX_BPM_BeatCallbackSet(audioStreamDecode, bpmOffset, new IntPtr(1));
float bpm = BassFx.BASS_FX_BPM_DecodeGet(audioStreamDecode, 20, 80, 0, BASSFXBpm.BASS_FX_BPM_MULT2, null);
return(bpm);
}
/// <summary>
/// 曲の一部分のテンポを取得する
/// </summary>
/// <param name="startSec">開始位置</param>
/// <param name="endSec">終了位置</param>
/// <returns>テンポ値</returns>
/// <remarks>テンポ値の範囲は70-300</remarks>
public float GetTempo(double startSec, double endSec)
{
fTempo = BassFx.BASS_FX_BPM_DecodeGet(
this.hBassStream,
startSec,
endSec,
(300 << 16) + 70, // MAX BPM=320, MIN BPM=70
//0,
BASSFXBpm.BASS_FX_BPM_DEFAULT, //BASSFXBpm.BASS_FX_BPM_MULT2,
null,
IntPtr.Zero);
return(fTempo);
}
/// <summary>
/// 曲全体のテンポを取得する
/// </summary>
/// <returns>テンポ値</returns>
/// <remarks>テンポ値の範囲は70-300</remarks>
public float GetTempo()
{
fTempo = BassFx.BASS_FX_BPM_DecodeGet(
this.hBassStream,
0,
nTotalSeconds,
(300 << 16) + 70, // MAX BPM=320, MIN BPM=70
//0,
BASSFXBpm.BASS_FX_BPM_DEFAULT, //BASSFXBpm.BASS_FX_BPM_MULT2,
null,
IntPtr.Zero);
return(fTempo);
}
public override async Task <(bool Changed, SongData song)> Execute(SongData song)
{
int stream = Bass.BASS_StreamCreateFile(song.FullFileName, 0, 0, BASSFlag.BASS_STREAM_DECODE);
if (stream == 0)
{
log.Error("BPM: Could not create stream for {0}. {1}", song.FullFileName, Bass.BASS_ErrorGetCode().ToString());
return(false, song);
}
_bpmProc = BpmProgressProc;
double len = Bass.BASS_ChannelBytes2Seconds(stream, Bass.BASS_ChannelGetLength(stream));
float bpm = BassFx.BASS_FX_BPM_DecodeGet(stream, 0.0, len, 0, BASSFXBpm.BASS_FX_BPM_BKGRND | BASSFXBpm.BASS_FX_FREESOURCE | BASSFXBpm.BASS_FX_BPM_MULT2,
_bpmProc, IntPtr.Zero);
song.BPM = Convert.ToInt32(bpm);
BassFx.BASS_FX_BPM_Free(stream);
return(true, song);
}
private void buttonPlay_Click(object sender, System.EventArgs e)
{
this.checkBoxSwap.Checked = false;
this.checkBoxFlanger.Checked = false;
this.checkBoxEcho.Checked = false;
Bass.BASS_StreamFree(_StreamFX);
if (_FileName != String.Empty)
{
// create the decoding stream
_Stream = Bass.BASS_StreamCreateFile(_FileName, 0, 0, BASSFlag.BASS_STREAM_DECODE | BASSFlag.BASS_SAMPLE_FLOAT | BASSFlag.BASS_STREAM_PRESCAN);
if (_Stream != 0)
{
_20mslength = (int)Bass.BASS_ChannelSeconds2Bytes(_Stream, 0.02f); // 20ms window
// and start to get the BPM...BEFORE! playing
bpmProc = new BPMPROCESSPROC(MyBPMProc);
float bpm = BassFx.BASS_FX_BPM_DecodeGet(_Stream, 1f, 180f, Utils.MakeLong(50, 180), BASSFXBpm.BASS_FX_BPM_BKGRND | BASSFXBpm.BASS_FX_FREESOURCE | BASSFXBpm.BASS_FX_BPM_MULT2, bpmProc, IntPtr.Zero);
this.labelBPM.Text = String.Format("BPM={0}", bpm);
// and set the position back...so that we hear the playback from the beginning...
// never get the BPM from '_Stream' while playing...this will steel the data from the decoding channel
Bass.BASS_ChannelSetPosition(_Stream, 0);
// now we create a Tempo channel...the actual playing channel
_StreamFX = BassFx.BASS_FX_TempoCreate(_Stream, BASSFlag.BASS_FX_FREESOURCE | BASSFlag.BASS_SAMPLE_FLOAT | BASSFlag.BASS_SAMPLE_LOOP);
}
if (_StreamFX != 0 && Bass.BASS_ChannelPlay(_StreamFX, false))
{
this.timerUpdate.Start();
// real-time beat position
beatProc = new BPMBEATPROC(MyBeatProc);
BassFx.BASS_FX_BPM_BeatCallbackSet(_StreamFX, beatProc, IntPtr.Zero);
}
else
{
Console.WriteLine("Error = {0}", Bass.BASS_ErrorGetCode());
}
}
}
