gsm06_10_codec.c

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};

static const unsigned char msGSMHeader[] = 
{
  // unknown data
  0x02, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x40, 0x01, 
  0x00, 0x00, 0x40, 0x01, 
  0x02, 0x00, 0x08, 0x00, 
  0x00, 0x00, 0x00, 0x00,

#define	GSM_FIXED_START 20  // Offset to this point in header

  // standard MS waveformatex structure follows
  0x31, 0x00,                 //    WORD    wFormatTag;        /* format type */
  0x01, 0x00,                 //    WORD    nChannels;         /* number of channels (i.e. mono, stereo...) */
  0x40, 0x1f, 0x00, 0x00,     //    DWORD   nSamplesPerSec;    /* sample rate */  
  0x59, 0x06, 0x00, 0x00,     //    DWORD   nAvgBytesPerSec;   /* for buffer estimation */
  0x41, 0x00,                 //    WORD    nBlockAlign;       /* block size of data */
  0x00, 0x00,                 //    WORD    wBitsPerSample;    /* Number of bits per sample of mono data */
  0x02, 0x00,                 //    WORD    cbSize;            /* The count in bytes of the size of 

#define	GSM_FIXED_LEN 18  // Number of bytes from GSM_FIXED_START to here 

  // extra GSM information
  0x40, 0x01,                 //    WORD    numberOfSamples    /* 320 */
  
  // unknown data
  0x00, 0x00  
};

#define	MICROSOFT_COUNTRY_CODE	181
#define	MICROSOFT_T35EXTENSION	0
#define	MICROSOFT_MANUFACTURER	21324

int msgsmCompareFunc(struct PluginCodec_H323NonStandardCodecData * data)
{
  int val;

  if ((data == NULL) || (data->objectId != NULL) || (data->data == NULL))
    return -1;

  val = MICROSOFT_COUNTRY_CODE - data->t35CountryCode;
  if (val != 0)
    return val;

  val = MICROSOFT_T35EXTENSION - data->t35Extension;
  if (val != 0)
    return val;

  val = MICROSOFT_MANUFACTURER - data->manufacturerCode;
  if (val != 0)
    return val;

  val = sizeof(msGSMHeader) - data->dataLength;
  if (val != 0)
    return val;

  return memcmp(data->data+GSM_FIXED_START, msGSMHeader+GSM_FIXED_START, GSM_FIXED_LEN);
}

static struct PluginCodec_H323NonStandardCodecData msgsmCap =
{
  NULL,
  MICROSOFT_COUNTRY_CODE, MICROSOFT_T35EXTENSION, MICROSOFT_MANUFACTURER,
  msGSMHeader, sizeof(msGSMHeader),
  msgsmCompareFunc
};


/////////////////////////////////////////////////////////////////////////////


static struct PluginCodec_Definition gsmCodecDefn[4] = {

{ 
  // encoder
  PLUGIN_CODEC_VERSION,               // codec API version
  &licenseInfo,                       // license information

  PluginCodec_MediaTypeAudio |        // audio codec
  PluginCodec_InputTypeRaw |          // raw input data
  PluginCodec_OutputTypeRaw |         // raw output data
  PluginCodec_RTPTypeExplicit,        // specified RTP type

  gsm0610,                            // text decription
  L16Desc,                            // source format
  gsm0610,                            // destination format

  0,                                  // user data (no WAV49)

  8000,                               // samples per second
  BITS_PER_SECOND,                    // raw bits per second
  20000,                              // nanoseconds per frame
  SAMPLES_PER_FRAME,                  // samples per frame
  BYTES_PER_FRAME,                    // bytes per frame
  PREF_FRAMES_PER_PACKET,             // recommended number of frames per packet
  MAX_FRAMES_PER_PACKET,              // maximum number of frames per packe
  PAYLOAD_CODE,                       // IANA RTP payload code
  sdpGSM,                             // RTP payload name

  create_codec,                       // create codec function
  destroy_codec,                      // destroy codec
  codec_encoder,                      // encode/decode
  NULL,                               // codec controls

  PluginCodec_H323AudioCodec_gsmFullRate,  // h323CapabilityType 
  &gsmCaps                             // h323CapabilityData
},

{ 
  // decoder
  PLUGIN_CODEC_VERSION,               // codec API version
  &licenseInfo,                       // license information

  PluginCodec_MediaTypeAudio |        // audio codec
  PluginCodec_InputTypeRaw |          // raw input data
  PluginCodec_OutputTypeRaw |         // raw output data
  PluginCodec_RTPTypeExplicit,        // dynamic RTP type

  gsm0610,                            // text decription
  gsm0610,                            // source format
  L16Desc,                            // destination format

  0,                                  // user data (no WAV49)

  8000,                               // samples per second
  BITS_PER_SECOND,                    // raw bits per second
  20000,                              // nanoseconds per frame
  SAMPLES_PER_FRAME,                  // samples per frame
  BYTES_PER_FRAME,                    // bytes per frame
  PREF_FRAMES_PER_PACKET,             // recommended number of frames per packet
  MAX_FRAMES_PER_PACKET,              // maximum number of frames per packe
  PAYLOAD_CODE,                       // IANA RTP payload code
  sdpGSM,                             // RTP payload name

  create_codec,                       // create codec function
  destroy_codec,                      // destroy codec
  codec_decoder,                      // encode/decode
  NULL,                               // codec controls

  PluginCodec_H323AudioCodec_gsmFullRate,  // h323CapabilityType 
  &gsmCaps                             // h323CapabilityData
},


// MS-GSM

  { 
  // encoder
  PLUGIN_CODEC_VERSION,               // codec API version
  &licenseInfo,                       // license information

  PluginCodec_MediaTypeAudio |        // audio codec
  PluginCodec_InputTypeRaw |          // raw input data
  PluginCodec_OutputTypeRaw |         // raw output data
  PluginCodec_RTPTypeDynamic,         // specified RTP type

  msGSM,                              // text decription
  L16Desc,                            // source format
  msGSM,                              // destination format

  (const void *)1,                    // user data (enable WAV49)

  8000,                               // samples per second
  BITS_PER_SECOND,                    // raw bits per second
  40000,                              // nanoseconds per frame
  MSGSM_SAMPLES_PER_FRAME,            // samples per frame
  MSGSM_BYTES_PER_FRAME,              // bytes per frame
  1,                                  // recommended number of frames per packet
  1,                                  // maximum number of frames per packe
  0,                                  // IANA RTP payload code
  sdpMSGSM,                           // RTP payload name

  create_codec,                       // create codec function
  destroy_codec,                      // destroy codec
  codec_msgsm_encoder,                // encode/decode
  NULL,                               // codec controls

  PluginCodec_H323Codec_nonStandard,  // h323CapabilityType 
  &msgsmCap                           // h323CapabilityData
},

{ 
  // decoder
  PLUGIN_CODEC_VERSION,               // codec API version
  &licenseInfo,                       // license information

  PluginCodec_MediaTypeAudio |        // audio codec
  PluginCodec_InputTypeRaw |          // raw input data
  PluginCodec_OutputTypeRaw |         // raw output data
  PluginCodec_RTPTypeDynamic,         // dynamic RTP type

  msGSM,                              // text decription
  msGSM,                              // source format
  L16Desc,                            // destination format

  (const void *)1,                    // user data (enable WAV49)

  8000,                               // samples per second
  BITS_PER_SECOND,                    // raw bits per second
  40000,                              // nanoseconds per frame
  MSGSM_SAMPLES_PER_FRAME,            // samples per frame
  MSGSM_BYTES_PER_FRAME,              // bytes per frame
  1,                                  // recommended number of frames per packet
  1,                                  // maximum number of frames per packe
  0,                                  // IANA RTP payload code
  sdpMSGSM,                           // RTP payload name

  create_codec,                       // create codec function
  destroy_codec,                      // destroy codec
  codec_msgsm_decoder,                // encode/decode
  NULL,                               // codec controls

  PluginCodec_H323Codec_nonStandard,  // h323CapabilityType 
  &msgsmCap                           // h323CapabilityData
},


};

#define NUM_DEFNS   (sizeof(gsmCodecDefn) / sizeof(struct PluginCodec_Definition))

/////////////////////////////////////////////////////////////////////////////

PLUGIN_CODEC_DLL_API struct PluginCodec_Definition * PLUGIN_CODEC_GET_CODEC_FN(unsigned * count, unsigned version)
{
  *count = NUM_DEFNS;
  return gsmCodecDefn;
}