D:/work/code_by/Wave/saveWaveToMp3.cpp

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#include <stdio.h>
#include <windows.h> 
#include "bladedll.h"

bool saveWaveToMp3(char *dllFile, char *mp3File, int *wave, int waveSize, int sampleRate, int bitRate, int mp3BitRate, bool mp3Stereo)
{
  FILE *fout;
  BEINITSTREAM beInitStream;
  BEENCODECHUNK beEncodeChunk;
  BEDEINITSTREAM beDeinitStream;
  BECLOSESTREAM beCloseStream;
  HINSTANCE hBladeDLL;
  BE_CONFIG  beConfig;
  DWORD dwSamples, dwMP3Buffer;
  HBE_STREAM hbeStream;
  PBYTE pMP3Buffer;
  PSHORT pBuffer;
  DWORD i, size, done, dwWrite, toread, towrite;
  int bytesShift, multipleShift;

  if (sampleRate != 32000 && sampleRate != 44100 && sampleRate != 48000)  //wav的取樣頻率不符合mp3的格式
    return false;

  if ((hBladeDLL = LoadLibrary(dllFile)) == NULL)  //載入dll
    return false;

  beInitStream = (BEINITSTREAM)GetProcAddress(hBladeDLL, TEXT_BEINITSTREAM);
  beEncodeChunk = (BEENCODECHUNK)GetProcAddress(hBladeDLL, TEXT_BEENCODECHUNK);
  beDeinitStream = (BEDEINITSTREAM)GetProcAddress(hBladeDLL, TEXT_BEDEINITSTREAM);
  beCloseStream = (BECLOSESTREAM)GetProcAddress(hBladeDLL, TEXT_BECLOSESTREAM);
  if (!beInitStream || !beEncodeChunk || !beDeinitStream || !beCloseStream)
    return false;

  if ((fout = fopen(mp3File, "wb")) == NULL)  //建立mp3檔案
  {
    FreeLibrary(hBladeDLL);
    return false;
  }

  beConfig.dwConfig = BE_CONFIG_MP3;
  beConfig.format.mp3.dwSampleRate = sampleRate;  //必須是32000, 44100或48000
  beConfig.format.mp3.byMode = mp3Stereo? BE_MP3_MODE_STEREO : BE_MP3_MODE_MONO;
  beConfig.format.mp3.wBitrate = mp3BitRate;  //必須是32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256或320
  beConfig.format.mp3.bCopyright = false;
  beConfig.format.mp3.bCRC = false;
  beConfig.format.mp3.bOriginal = false;
  beConfig.format.mp3.bPrivate = false;
  beInitStream(&beConfig, &dwSamples, &dwMP3Buffer, &hbeStream);

  pMP3Buffer = new BYTE[dwMP3Buffer];
  pBuffer = new SHORT[dwSamples];

  bytesShift = mp3Stereo? 1 : 0;
  multipleShift = bitRate == 8? 8 : 0;
  size = (unsigned int)waveSize << bytesShift;
  done = 0;
  while (done < size)
  {
    if (done + dwSamples < size)
      toread = dwSamples;
    else
      toread = size - done;
    for (i = 0; i < toread; i++)
      pBuffer[i] = wave[(done + i) >> bytesShift] << multipleShift;
    beEncodeChunk(hbeStream, toread, pBuffer, pMP3Buffer, &towrite);  //壓縮
    fwrite(pMP3Buffer, sizeof(char), towrite, fout);  //寫入mp3檔
    done += toread;
  }

  beDeinitStream(hbeStream, pMP3Buffer, &dwWrite);
  if (dwWrite)
    fwrite(pMP3Buffer, sizeof(char), dwWrite, fout);  //寫入mp3檔

  delete[] pMP3Buffer;
  delete[] pBuffer;

  beCloseStream(hbeStream);
  fclose(fout);  //關閉mp3檔
  FreeLibrary(hBladeDLL);  //釋放dll

  return true;
}

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