FDK/コード/06.Tempo/CBeatDetect.cs

   1 using System;
   2 using System.Collections.Generic;
   3 using System.Text;
   4 using System.Diagnostics;
   5 using System.Threading;
   6 using Un4seen.Bass;
   7 //using Un4seen.BassAsio;
   8 //using Un4seen.BassWasapi;
   9 //using Un4seen.Bass.AddOn.Mix;
  10 using Un4seen.Bass.AddOn.Fx;
  11
  12 namespace FDK
  13 {
  14         public class CBeatDetect : IDisposable
  15         {
  16                 public struct stBeatPos
  17                 {
  18                         public float fBeatTime;
  19                         public int n小節番号;
  20                         public int nGrid;
  21                         public int n小節内Grid;
  22                         public bool b無効;                                    //
  23                         public bool bレーン表示する;             // 未使用
  24
  25                         public stBeatPos( float _fBeatTime, int _n小節番号, int _nGrid, int _n小節内Grid, bool _b無効, bool _bレーン表示する )
  26                         {
  27                                 fBeatTime = _fBeatTime;
  28                                 n小節番号 = _n小節番号;
  29                                 nGrid = _nGrid;
  30                                 n小節内Grid = _n小節内Grid;
  31                                 b無効 = _b無効;
  32                                 bレーン表示する= _bレーン表示する;
  33                         }
  34                 }
  35
  36                 #region [ コンストラクタ ]
  37                 public CBeatDetect()
  38                 {
  39                         Initialize();
  40                 }
  41                 public CBeatDetect( string _filename )
  42                 {
  43                         this.filename = _filename;
  44                         Initialize();
  45                 }
  46                 #endregion
  47                 #region [ 初期化(コンストラクタから呼び出される) ]
  48                 private void Initialize()
  49                 {
  50                         if ( this.listBeatPositions == null )
  51                         {
  52                                 this.listBeatPositions = new List<stBeatPos>();
  53                         }
  54
  55                         #region [ BASS registration ]
  56                         // BASS.NET ユーザ登録（BASSスプラッシュが非表示になる）。
  57
  58                         BassNet.Registration( "dtx2013@gmail.com", "2X9181017152222" );
  59                         #endregion
  60                         #region [ BASS Version Check ]
  61                         // BASS のバージョンチェック。
  62                         int nBASSVersion = Utils.HighWord( Bass.BASS_GetVersion() );
  63                         if ( nBASSVersion != Bass.BASSVERSION )
  64                                 throw new DllNotFoundException( string.Format( "bass.dll のバージョンが異なります({0})。このプログラムはバージョン{1}で動作します。", nBASSVersion, Bass.BASSVERSION ) );
  65
  66                         int nBASSFXVersion = Utils.HighWord( BassFx.BASS_FX_GetVersion() );
  67                         if ( nBASSFXVersion != BassFx.BASSFXVERSION )
  68                                 throw new DllNotFoundException( string.Format( "bass_fx.dll のバージョンが異なります({0})。このプログラムはバージョン{1}で動作します。", nBASSFXVersion, BassFx.BASSFXVERSION ) );
  69                         #endregion
  70
  71                         #region [ BASS の設定。]
  72                         //this.bIsBASSFree = true;
  73                         //Debug.Assert( Bass.BASS_SetConfig( BASSConfig.BASS_CONFIG_UPDATEPERIOD, 0 ),          // 0:BASSストリームの自動更新を行わない。(サウンド出力しないため)
  74                         //    string.Format( "BASS_SetConfig() に失敗しました。[{0}", Bass.BASS_ErrorGetCode() ) );
  75                         #endregion
  76                         #region [ BASS の初期化。]
  77                         int nデバイス = 0;          // 0:"no sound" … BASS からはデバイスへアクセスさせない。
  78                         //int nデバイス = -1;               // 0:"no sound" … BASS からはデバイスへアクセスさせない。
  79                         int n周波数 = 44100; // 仮決め。lデバイス（≠ドライバ）がネイティブに対応している周波数であれば何でもいい？ようだ。いずれにしろBASSMXで自動的にリサンプリングされる。
  80                         if ( !Bass.BASS_Init( nデバイス, n周波数, BASSInit.BASS_DEVICE_DEFAULT, IntPtr.Zero ) )
  81                                 throw new Exception( string.Format( "BASS の初期化に失敗しました。(BASS_Init)[{0}]", Bass.BASS_ErrorGetCode().ToString() ) );
  82                         #endregion
  83
  84                         #region [ 指定されたサウンドファイルをBASSでオープンし、必要最小限の情報を取得する。]
  85                         //this.hBassStream = Bass.BASS_StreamCreateFile( this.filename, 0, 0, BASSFlag.BASS_STREAM_PRESCAN | BASSFlag.BASS_STREAM_DECODE );
  86                         this.hBassStream = Bass.BASS_StreamCreateFile( this.filename, 0, 0, BASSFlag.BASS_STREAM_DECODE );
  87                         //this.hBassStream = Bass.BASS_StreamCreateFile( this.filename, 0, 0, BASSFlag.BASS_SAMPLE_FLOAT | BASSFlag.BASS_STREAM_PRESCAN );
  88                         if ( this.hBassStream == 0 )
  89                                 throw new Exception( string.Format( "{0}: サウンドストリームの生成に失敗しました。(BASS_StreamCreateFile)[{1}]", filename, Bass.BASS_ErrorGetCode().ToString() ) );
  90
  91                         this.nTotalBytes = Bass.BASS_ChannelGetLength( this.hBassStream );
  92
  93                         this.nTotalSeconds = Bass.BASS_ChannelBytes2Seconds( this.hBassStream, nTotalBytes );
  94                         if ( !Bass.BASS_ChannelGetAttribute( this.hBassStream, BASSAttribute.BASS_ATTRIB_FREQ, ref fFreq ) )
  95                         {
  96                                 string errmes = string.Format( "サウンドストリームの周波数取得に失敗しました。(BASS_ChannelGetAttribute)[{0}]", Bass.BASS_ErrorGetCode().ToString() );
  97                                 Bass.BASS_Free();
  98                                 throw new Exception( errmes );
  99                         }
 100
 101
 102
 103                         int bs = Bass.BASS_ChannelSetFX( this.hBassStream, BASSFXType.BASS_FX_BFX_BQF, 1 );
 104
 105                         BASS_BFX_BQF param = new BASS_BFX_BQF(
 106                                 BASSBFXBQF.BASS_BFX_BQF_LOWPASS,        // filter
 107                                 800.0f,                                                         // center       default=200
 108                                 15,                                                                     // gain deafult=0
 109                                 0,                                                                      // bandwidth
 110                                 1,      //0.67f,                                                                        // Q
 111                                 0,                                                                      // s
 112                                 BASSFXChan.BASS_BFX_CHANALL                     //chans
 113                         );
 114
 115                         bool b = Bass.BASS_FXSetParameters( bs, param );
 116                         if ( b == false )
 117                         {
 118                                 Debug.WriteLine( "effect set failed: " + Bass.BASS_ErrorGetCode().ToString() );
 119                         }
 120                         //bool b2 = Bass.BASS_ChannelPlay( this.hBassStream, false );
 121                         //if ( b2 == false )
 122                         //{
 123                         //    Debug.WriteLine( "plyback failed: " + Bass.BASS_ErrorGetCode().ToString() );
 124                         //}
 125                         #endregion
 126                 }
 127                 #endregion
 128
 129                 /// <summary>
 130                 /// 曲全体のテンポを取得する
 131                 /// </summary>
 132                 /// <returns>テンポ値</returns>
 133                 /// <remarks>テンポ値の範囲は70-300</remarks>
 134                 public float GetTempo()
 135                 {
 136                         fTempo = BassFx.BASS_FX_BPM_DecodeGet(
 137                                 this.hBassStream,
 138                                 0,
 139                                 nTotalSeconds,
 140                                 ( 300 << 16 ) + 70,             // MAX BPM=320, MIN BPM=70
 141                                 //0,
 142                                 BASSFXBpm.BASS_FX_BPM_DEFAULT,          //BASSFXBpm.BASS_FX_BPM_MULT2,
 143                                 null,
 144                                 IntPtr.Zero );
 145                         return fTempo;
 146                 }
 147                 /// <summary>
 148                 /// 曲の一部分のテンポを取得する
 149                 /// </summary>
 150                 /// <param name="startSec">開始位置</param>
 151                 /// <param name="endSec">終了位置</param>
 152                 /// <returns>テンポ値</returns>
 153                 /// <remarks>テンポ値の範囲は70-300</remarks>
 154                 public float GetTempo( double startSec, double endSec )
 155                 {
 156                         fTempo = BassFx.BASS_FX_BPM_DecodeGet(
 157                                 this.hBassStream,
 158                                 startSec,
 159                                 endSec,
 160                                 ( 300 << 16 ) + 70,             // MAX BPM=320, MIN BPM=70
 161                                 //0,
 162                                 BASSFXBpm.BASS_FX_BPM_DEFAULT,          //BASSFXBpm.BASS_FX_BPM_MULT2,
 163                                 null,
 164                                 IntPtr.Zero );
 165                         return fTempo;
 166                 }
 167
 168
 169                 /// <summary>
 170                 /// Beatの検出位置をListで返す
 171                 /// </summary>
 172                 /// <returns>Beat検出位置群</returns>
 173                 public List<stBeatPos> GetBeatPositions()
 174                 {
 175                         #region [  BeatPosition格納リストの初期化 ]
 176                         if ( this.listBeatPositions != null )
 177                         {
 178                                 this.listBeatPositions.Clear();
 179                         }
 180                         else
 181                         {
 182                                 this.listBeatPositions = new List<stBeatPos>();
 183                         }
 184                         #endregion
 185
 186                         BPMBEATPROC _beatProc = new BPMBEATPROC( GetBeat_ProgressCallback );
 187
 188                         //
 189                         //
 190                         // LPFを通してから、BeatDecodeGetしてみること。
 191                         //
 192                         //
 193
 194                         bool ret = BassFx.BASS_FX_BPM_BeatDecodeGet(
 195                                 this.hBassStream,
 196                                 0,
 197                                 nTotalSeconds,
 198                                 //0,
 199                                 BASSFXBpm.BASS_FX_BPM_DEFAULT,          //BASSFXBpm.BASS_FX_BPM_MULT2,
 200                                 _beatProc,
 201                                 IntPtr.Zero );
 202
 203                         return this.listBeatPositions;
 204                 }
 205
 206                 private void GetBeat_ProgressCallback( int channel, double beatpos, IntPtr user )
 207                 {
 208                         stBeatPos sbp = new stBeatPos(
 209                                 (float) beatpos,
 210                                 0,
 211                                 0,
 212                                 0,
 213                                 false,
 214                                 true
 215                         );
 216
 217
 218                         listBeatPositions.Add( sbp );
 219 //                      Debug.WriteLine( "Beat at: " + beatpos.ToString() );
 220                 }
 221
 222
 223
 224
 225                 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。
 226                 {
 227                         BassFx.BASS_FX_BPM_Free( this.hBassStream );
 228                         Bass.BASS_StreamFree( this.hBassStream );
 229                         this.hBassStream = -1;
 230                         Bass.BASS_Free();
 231                 }
 232
 233                 // =============
 234                 private string filename = "";
 235                 private int hBassStream = -1;
 236                 private long nTotalBytes = 0;
 237                 private double nTotalSeconds = 0.0f;
 238                 private float fFreq = 0.0f;
 239                 private float fTempo;
 240                 private List<stBeatPos> listBeatPositions = null;
 241         }
 242 }