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IPP G.723.1 speech codec is compliant with ITU-T G.723.1 and Annex A specifications. Pjmedia_codec_mgr_set_default_param(., ¶m) Note The difference of Annex B status in SDP offer/answer may be considered as incompatible codec in SDP negotiation. Here is an example of modifying default setting of Annex B to be disabled using pjmedia_codec_mgr_set_default_param(): When this parameter is omitted in the SDP, the value will be "yes" (RFC 4856 Section 2.1.9). Valid values are "yes" and "no", the implementation default is "yes". In pjmedia_codec_param, Annex B is configured via VAD setting and format parameter "annexb" in the SDP "a=fmtp" attribute in decoding fmtp field. This default setting of Annex B can be modified using pjmedia_codec_mgr_set_default_param(). The capability of VAD/DTX is specified in Annex B.īy default, Annex B is enabled. Note that G.729 VAD status should be signalled in SDP, see more description below. Please see the documentation of pjmedia_codec_param for more info. General codec settings for this codec such as VAD and PLC can be manipulated through the setting field in pjmedia_codec_param. IPP G.729 supports 16-bit PCM audio signal with sampling rate 8000Hz, frame length 10ms, and resulting in bitrate 8000bps (annexes D and E introduce bitrates 6400bps and 11800bps). However, currently the pjmedia implementation is using Annexes A and B only. IPP G.729 is compliant with ITU-T G.729 and Annexes A, B, C, C+, D, E, I specifications.
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After the codec factory has been registered, application can use Codec Framework API to manipulate the codec. This section describes functions to initialize and register IPP codec factory to the codec manager. Pjmedia_codec_ipp_init ( pjmedia_endpt *endpt)