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Multimedia Software for ATCA Release 1.0 Release Update, Rev 06 — January 23, 2008 31
Dialogic Corporation
unParm1
set to a value from the eIPM_CODER_OPTION_PARMS enumeration
For AMR, set to 0.
For EVRC, where the media type is
MEDIATYPE_AUDIO_REMOTE_CODER_OPTIONS_INFO, valid value is:
• CODER_OPT_INTERLEAVE_LENGTH - Reduce the listener’s perception of data loss
by spreading such a loss over non-consecutive vocoder frames.
• CODER_OPT_CDMA_RATE_REDUC - Rate reduction. Bit rate is varied to achieve a
variety of average bit rates for more flexibility in bandwidth usage.
nValue1
The value set here is for the parameter specified in unParm1.
For AMR, set to 0.
For EVRC, where unParm1=CODER_OPT_INTERLEAVE_LENGTH, possible values are in
the range 0 to 7. The default value is 0.
For EVRC, where unParm1=CODER_OPT_CDMA_RATE_REDUC, possible values are 0
and 4. Default value is 0.
unParm2
For AMR, set to 0.
For EVRC, set to 0.
nValue2
For AMR, set to 0.
For EVRC, set to 0.
Example
The following code example shows how to set options when using an EVRC coder type:
... /* Setup IP address here */
// Local Audio Coder
ipmMediaInfo.MediaData[unCount].eMediaType = MEDIATYPE_AUDIO_LOCAL_CODER_INFO;
ipmMediaInfo.MediaData[unCount].mediaInfo.AudioCoderInfo.eCoderType = CODER_TYPE_EVRC;
ipmMediaInfo.MediaData[unCount].mediaInfo.AudioCoderInfo.eFrameSize = CODER_FRAMESIZE_20;
ipmMediaInfo.MediaData[unCount].mediaInfo.AudioCoderInfo.unFramesPerPkt = 2;
ipmMediaInfo.MediaData[unCount].mediaInfo.AudioCoderInfo.eVadEnable = CODER_VAD_DISABLE;
ipmMediaInfo.MediaData[unCount].mediaInfo.AudioCoderInfo.unCoderPayloadType = 96;
ipmMediaInfo.MediaData[unCount].mediaInfo.AudioCoderInfo.unRedPayloadType = 0;
unCount++;
// Remote Audio Coder
ipmMediaInfo.MediaData[unCount].eMediaType = MEDIATYPE_AUDIO_REMOTE_CODER_INFO;
ipmMediaInfo.MediaData[unCount].mediaInfo.AudioCoderInfo.eCoderType = CODER_TYPE_EVRC;
ipmMediaInfo.MediaData[unCount].mediaInfo.AudioCoderInfo.eFrameSize = CODER_FRAMESIZE_20;
ipmMediaInfo.MediaData[unCount].mediaInfo.AudioCoderInfo.unFramesPerPkt = 2;
ipmMediaInfo.MediaData[unCount].mediaInfo.AudioCoderInfo.eVadEnable = CODER_VAD_DISABLE;
ipmMediaInfo.MediaData[unCount].mediaInfo.AudioCoderInfo.unCoderPayloadType = 96;
ipmMediaInfo.MediaData[unCount].mediaInfo.AudioCoderInfo.unRedPayloadType = 0 ;
unCount++;