FDK/コード/03.サウンド/Cmp3.cs

   1 using System;
   2 using System.Collections.Generic;
   3 using System.Text;
   4 using System.Runtime.InteropServices;
   5 using System.IO;
   6 using System.Diagnostics;
   7 using System.Threading;
   8 using Un4seen.Bass;
   9 using Un4seen.Bass.Misc;
  10
  11
  12 namespace FDK
  13 {
  14         public unsafe class Cmp3 : SoundDecoder
  15         {
  16                 private int stream_in = -1;
  17                 private bool bBASS_Already_Init = false;
  18
  19                 public override int Open( string filename )
  20                 {
  21                         bBASS_Already_Init = !Bass.BASS_Init(0, 48000, BASSInit.BASS_DEVICE_DEFAULT, IntPtr.Zero);
  22                         // WASAPI/ASIO使用時は(BASS_ERROR_ALREADYとなって)falseが返るので、覚えておく。
  23                         // 後でCmp3.Close()時にBASSを終了させないようにするため。
  24
  25                         stream_in = Bass.BASS_StreamCreateFile(filename, 0, 0, BASSFlag.BASS_DEFAULT | BASSFlag.BASS_STREAM_DECODE);
  26                         if (stream_in == 0)
  27                         {
  28                                 BASSError be = Bass.BASS_ErrorGetCode();
  29                                 Trace.TraceInformation("Cmp3: StreamCreateFile error: " + be.ToString());
  30                         }
  31                         nTotalPCMSize = Bass.BASS_ChannelGetLength(stream_in);
  32
  33                         #region [ Getting WAVEFORMEX info ]
  34                         var chinfo = Bass.BASS_ChannelGetInfo(stream_in);
  35                         wfx = new CWin32.WAVEFORMATEX(
  36                                 (ushort)1,                                                              // wFormatTag
  37                                 (ushort)chinfo.chans,                                   // nChannels
  38                                 (uint)chinfo.freq,                                              // nSamplesPerSec
  39                                 (uint)(chinfo.freq * 2 * chinfo.chans), // nAvgBytesPerSec
  40                                 (ushort)(2 * chinfo.chans),                             // nBlockAlign
  41                                 16,                                                                             // wBitsPerSample
  42                                 0                                                                               // cbSize
  43                         );
  44                         #endregion
  45
  46                         //string fn = Path.GetFileName(filename);
  47                         //Trace.TraceInformation("filename=" + fn + ", size=(decode): " + wavdata.Length + ", channelgetlength=" + _TotalPCMSize2 + ", " + _TotalPCMSize) ;
  48
  49                         return 0;
  50                 }
  51
  52                 public override int Decode(ref byte[] Dest, long offset)
  53                 {
  54                         #region [ decode ]
  55                         int LEN = 65536;
  56                         byte[] data = new byte[LEN]; // 2 x 16-bit and length in is bytes
  57                         long len = 0;
  58                         long p = 0;
  59                         do
  60                         {
  61                                 len = Bass.BASS_ChannelGetData(stream_in, data, LEN);
  62                                 if (len < 0)
  63                                 {
  64                                         BASSError be = Bass.BASS_ErrorGetCode();
  65                                         Trace.TraceInformation("Cmp3: BASS_ChannelGetData Error: " + be.ToString());
  66                                 }
  67                                 if (p + len > nTotalPCMSize)
  68                                 {
  69                                         len = nTotalPCMSize - p;
  70                                 }
  71                                 Array.Copy(data, 0, Dest, p, len);
  72                                 p += len;
  73                         } while (p < nTotalPCMSize);
  74                         #endregion
  75
  76 //SaveWav(filename, Dest);
  77
  78                         data = null;
  79                         return 0;
  80                 }
  81
  82                 public override void Close()
  83                 {
  84                         if (!bBASS_Already_Init)
  85                         {
  86                                 Bass.BASS_StreamFree(stream_in);
  87                                 Bass.BASS_Free();
  88                         }
  89                 }
  90
  91                 /// <summary>
  92                 /// save wav file (for debugging)
  93                 /// </summary>
  94                 /// <param name="filename">input mp3/xa filename</param>
  95                 private void SaveWav(string filename, byte[] Dest)
  96                 {
  97                         string outfile = Path.GetFileName(filename);
  98                         var fs = new FileStream(outfile + ".wav", FileMode.Create);
  99                         var st = new BinaryWriter(fs);
 100
 101                         st.Write(new byte[] { 0x52, 0x49, 0x46, 0x46 });      // 'RIFF'
 102                         st.Write((int)(nTotalPCMSize + 44 - 8));            // RIFF chunk size
 103                         st.Write(new byte[] { 0x57, 0x41, 0x56, 0x45 });      // 'WAVE'
 104                         st.Write(new byte[] { 0x66, 0x6D, 0x74, 0x20 });      // 'fmt '
 105                         st.Write(new byte[] { 0x10, 0x00, 0x00, 0x00 });      // chunk size 16bytes
 106                         st.Write(new byte[] { 0x01, 0x00 }, 0, 2);                  // formatTag 0001 PCM
 107                         st.Write((short)wfx.nChannels);                              // channels
 108                         st.Write((int)wfx.nSamplesPerSec);                             // samples per sec
 109                         st.Write((int)wfx.nAvgBytesPerSec);          // avg bytesper sec
 110                         st.Write((short)wfx.nBlockAlign);                        // blockalign = 16bit * mono/stereo
 111                         st.Write((short)wfx.wBitsPerSample);                  // bitspersample = 16bits
 112
 113                         st.Write(new byte[] { 0x64, 0x61, 0x74, 0x61 });      // 'data'
 114                         st.Write((int) nTotalPCMSize);      // datasize
 115
 116                         st.Write(Dest);
 117 Trace.TraceInformation($"wrote ({outfile}.wav) fsLength=" + fs.Length + ", TotalPCMSize=" + nTotalPCMSize + ", diff=" + (fs.Length - nTotalPCMSize));
 118                         st.Dispose();
 119                         fs.Dispose();
 120                 }
 121         }
 122 }