Intel IPP + GSM

[Gast (Gast)]

Hallo
Vielleicht kann mir ja jemand von euch helfen. Ich will mit Hilfe der 
Intel IPP einen Alaw stream in einen GSMFR umwandeln. Das decoden geht 
bereits aber beim encoden macht er probleme. Er codiert nicht richtig 
zumindest höre ich am Telefon nichts und ich weiß das er aber ein wave 
File vorspielt. Selbst wenn ich immer den selben Buffer zum encoden gebe 
kommt immer was anderes raus.

  LoadedCodec gsm_codec;
  gsm_codec.lIsVad = 0;
  int gsm_available = 1;
  
  // Load the used codec
  codec_status = LoadUSCCodecByNumber(&gsm_codec, 3);
  if(codec_status < 0)
  {
    T.Trace(TraceInfo, __FUNCTION__"++. GSM: Unable to load codec\n");
    gsm_available = -1;
  }
  // Allocate memory for the codec
  codec_status = USCCodecAllocInfo(&gsm_codec.uscParams);
  if(codec_status < 0)
  {
    T.Trace(TraceInfo, __FUNCTION__"++. GSM: Could not allocate CodecInfo\n");
    gsm_available = -1;
  }
  // Get CodecInfo
  codec_status = USCCodecGetInfo(&gsm_codec.uscParams);
  if(codec_status < 0)
  {  
    T.Trace(TraceInfo, __FUNCTION__"++. GSM: Could not get CodecInfo\n");
    gsm_available = -1;
  }
  // Get Params by format
  codec_status = GetUSCCodecParamsByFormat(&gsm_codec,BY_NAME);
  if(codec_status < 0)
  {
    T.Trace(TraceInfo, __FUNCTION__"++. GSM: CodecInfoByFormat got successful\n");
    gsm_available = -1;
  }
  SetUSCEncoderParams(&gsm_codec.uscParams);
  gsm_codec.uscParams.nChannels = 1;
  // allocate memory for the codec
  codec_status = USCCodecAlloc(&gsm_codec.uscParams);
  if(codec_status < 0)
  {
    T.Trace(TraceInfo, __FUNCTION__"++. GSM: USCCodecAlloc() failed\n");
    gsm_available = -1;
  }
  // init the Encoder
  codec_status = USCEncoderInit(&gsm_codec.uscParams);
  if(codec_status < 0)
  {
    T.Trace(TraceInfo, __FUNCTION__"++. GSM: EncoderInit not successful\n");
    gsm_available = -1;
  }

  char outbuffer_lin[1000];
  char outbuffer[1000];
  char* p_out = outbuffer_lin;
  char* p_in = (char*)(datalist->item[tmp_session->data_index].data);
  int cvtLen = 160;//RTP_PACKETSIZE * tmp_session->packetsize;
  int outlen = 0;
        
  codec_status = USC_CvtToLiniar(&gsm_codec.uscParams, 6, &p_in, &cvtLen, &p_out, &outlen);
  if(codec_status < 0)
    T.Trace(TraceInfo, __FUNCTION__"++. GSM: USC_CvtToLinear was not successful\n");
  
  outlen = encode(&gsm_codec.uscParams, (char*)(outbuffer_lin), outbuffer, outlen, 500);

Danke im vorhinein!

MFG Gast