- (void)Wav2Mp3  
{  
    NSString *srcFile = self.srcFilePath;  
    NSString *dstFile = self.dstFilePath;  
      
    long readLen, writeLen;  
    FILEFILE *srcWav = fopen([srcFile UTF8String], "rb");  
    //跳过文件头  
    fseek(srcWav, sizeof(WavFileHeader), SEEK_CUR);  
      
    FILEFILE *destMp3 = fopen([dstFile UTF8String], "wb");  
      
    const int PCM_SIZE = 16384;  
    const int MP3_SIZE = 16384;  
    short pcm_buffer[PCM_SIZE*2];  
    unsigned char mp3_buffer[MP3_SIZE];  
//这里要注意，lame的配置要跟AVAudioRecorder的配置一样，否则会造成转换失败  
    lame_t lame = lame_init();  
    lame_set_in_samplerate(lame, kSampleRate);  
    lame_set_VBR(lame, vbr_default);  
    lame_init_params(lame);  
      
    do  
    {  
        readLen = fread(pcm_buffer, 2*sizeof(short int), PCM_SIZE, srcWav);  
        if (readLen == 0)  
        {  
            writeLen = lame_encode_flush(lame, mp3_buffer, MP3_SIZE);  
        }  
        else  
        {  
            writeLen = lame_encode_buffer_interleaved(lame, pcm_buffer, (int)readLen, mp3_buffer, MP3_SIZE);  
        }  
          
        fwrite(mp3_buffer, writeLen, 1, destMp3);  
          
    } while (readLen != 0);  
      
    lame_close(lame);  
    fclose(destMp3);  
    fclose(srcWav);  
}