Write two channel (stereo) immediately Wav file

    Recently completed dual channel （ Stereo is also called dual track ） Voice file recording , I will write my experience here . The format of the two channel file I recorded is PCM,16K,16Bit Of ,blockAlign Set up 2. Stereo voice adopts 0 channel （ Left ） 1 channel （ Right ） 0 channel （ Left ） 1 channel （ Right ）. The specific Settings are as follows ：

audioCodec by 1,channels by 2,samplesPerSec by 8000（ It's very important ）.samplesPerSec Set to 8000 The reason for this is to use 16000/2, That is, divide the sampling rate by the number of channels . The reason for this is that when setting the voice content in stereo, the voice data of the left and right channels will be scattered and placed in the content .

void TWavMediaFile::Close()
{
   /* write wav head */
   if(m_fp && m_modified)
   {
      m_modified = false;
      rewind(m_fp);
		LOG(DETAIL, "m_fp postion:%d", ftell(m_fp));
      char buffer[44], *p = buffer;
      int32_t a;
      int16_t b;
      sprintf(p, "RIFF");
      p+=4;
      a = htolel(m_length + 44 - 8);
      memcpy(p, &a, 4);
      p+=4;
      sprintf(p, "WAVEfmt ");
      p+=8;
      a = htolel(16);
      memcpy(p, &a, 4);
      p+=4;
      LOG(DETAIL, "m_audioCodec: %d", m_audioCodec);
      b = htoles((int16_t)m_audioCodec);
      memcpy(p, &b, 2);
      p+=2;
      LOG(DETAIL, "m_channels: %d", m_channels);
      b = htoles((int16_t)m_channels);
      memcpy(p, &b, 2);
      p+=2;
      LOG(DETAIL, "m_samplesPerSec: %d", m_samplesPerSec);
      a = htolel((int32_t)m_samplesPerSec/2);
      memcpy(p, &a, 4);
      p+=4;
      LOG(DETAIL, "m_avgBytesPerSec: %d", m_avgBytesPerSec);
      a =  ((int32_t)m_avgBytesPerSec*m_channels);
      memcpy(p, &a, 4);
      p+=4;
      LOG(DETAIL, "m_blockAlign: %d", m_blockAlign);
      b = htoles((int16_t)m_blockAlign * m_channels );
      memcpy(p, &b, 2);
      p+=2;
      LOG(DETAIL, "m_bitsPerSample: %d", m_bitsPerSample);
      b = htoles((int16_t)m_bitsPerSample);
      memcpy(p, &b, 2);
      p+=2;
      sprintf(p, "data");
      p+=4;
      LOG(DETAIL, "m_length: %d", m_length);
      a = htolel(m_length);
      memcpy(p, &a, 4);

      fwrite(buffer, 1, 44, m_fp);
   }

   if(m_fp)
      fclose(m_fp);
   m_fp = 0;
   m_length = 0;
}

Set the speech synthesis of two channels to one BUFFER The code of the implementation in is as follows ：

void TRecord::feedG711Stero(const char* buffer1, int length1, const char *buffer2, int length2 )
{
    char *p = (char*)buffer1;

    char twoChannelBuffer[MAXAUDIOBUFFERSIZE] = {0};
    /* this only for 8bit per sample */
	int i = 0;
	int j = 0;
    for ( j = 0, j = 0; i != PCMFRAMELEN; i++ )
    {
        twoChannelBuffer[j++] = m_buffer[i];
        twoChannelBuffer[j++] = m_buffer2[i];
    }

    m_mediaFile->putAudioData(twoChannelBuffer, j );
}