Dialogic DIALOGIC MULTIMEDIA SOFTWARE FOR ADVANCEDTCA RELEASE 1.0 Manual Do Utilizador

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Dialogic Corporation

AMR and EVRC audio coder options

typedef struct ipm_audio_coder_options_info_tag 
{
      unsigned int unVersion;
      unsigned int unCoderOptions; 
      unsigned int unParm1;
      int nValue1;
      unsigned int unParm2;
      int nValue2;
} IPM_AUDIO_CODER_OPTIONS_INFO; 

„

This data structure provides additional options when using AMR, EVRC, and QCELP audio 
coders. For information about QCELP (available as of Service Update 80), see 

All unused fields in the IPM_AUDIO_CODER_OPTIONS_INFO structure must be set to 0. 

„

The fields of the IPM_AUDIO_CODER_OPTIONS_INFO data structure are described as follows:

For EVRC, where the media type is MEDIATYPE_AUDIO_LOCAL_CODER_OPTIONS_INFO, 
all field values are ignored by the firmware. 

unVersion 

set to IPM_AUDIO_CODER_OPTIONS_INFO_VERSION

unCoderOptions 

For AMR coders where the media type is 
MEDIATYPE_AUDIO_LOCAL_CODER_OPTIONS_INFO, valid values are: 

CODER_OPT_AMR_EFFICIENT - Minimize the amount of network bandwidth
or 
CODER_OPT_AMR_OCTET - Make packet parsing easier for the AMR application

For AMR coders where the media type is 
MEDIATYPE_AUDIO_REMOTE_CODER_OPTIONS_INFO, valid values that can be ORed 
together are: 

CODER_OPT_AMR_EFFICIENT (see description above) 
or 
CODER_OPT_AMR_OCTET (see description above) 

CODER_OPT_AMR_CMR_TRACK - Specify that the transmit bit rate should follow the 
CMR value in the received packet 
or 
CODER_OPT_AMR_CMR_LIMIT - Specify that the transmit bit rate should follow the 
CMR value in the received packet with a maximum value specified by the preferred bit 
rate. 

For EVRC, set to CODER_OPT_SIGNALING_OFF.