public void Dispose() // 使い終わったら必ずDispose()すること。BASSのリソースを握りっぱなしにすると、他の再生に不都合が生じるため。
{
BassFx.BASS_FX_BPM_Free(this.hBassStream);
Bass.BASS_StreamFree(this.hBassStream);
this.hBassStream = -1;
Bass.BASS_Free();
}
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);
}