How can I add new codec to PJMEDIA? ?<http://trac.pjsip.org/repos/wiki/FAQ#adding-codec> First of all, read the Codec Framework<http://www.pjsip.org/pjmedia/docs/html/group__PJMEDIA__CODEC.htm>documentation. Then, the easiest is to take other codec source file in pjmedia-codec directory, such as gsm.c<http://www.pjsip.org/trac/browser/pjproject/trunk/pjmedia/src/pjmedia-codec/gsm.c>, and replace GSM specific function calls with the functions that are provided by your codec library. There are two "classes" to implement: - The codec factory (pjmedia_codec_factory<http://www.pjsip.org/pjmedia/docs/html/structpjmedia__codec__factory.htm>) - Codec factory will be queried by PJMEDIA to see if it can instantiate a codec instance based on a codec descriptor (pjmedia_codec_info<http://www.pjsip.org/pjmedia/docs/html/structpjmedia__codec__info.htm>). Codec factory also provides information about what particular codecs it supports, so that PJMEDIA can list these codecs in the local SDP capability descriptor. - The codec itself (pjmedia_codec<http://www.pjsip.org/pjmedia/docs/html/structpjmedia__codec.htm>) - The codec instance provides functions to parse, encode and decode audio frames. Optionally it may provide a function to recover lost frames (known as *Packet Lost Concealment* feature, or PLC). Once it's finished, you should end up with just two public APIs exported by the implementation: an initialization function, and a deinitialization function. The initialization function's primary task is to register the codec factory to PJMEDIA's codec manager, so that PJMEDIA knows about this new codec. While the deinitialization function is to unregister the codec factory, and to release resources, if any. Then call the codec initialization function in the application. After this, the codec should be picked up automagically by the rest of PJMEDIA framework (that is, PJSIP should advertise the codec in outgoing SDP and negotiate it with remote's SDP, and encode/decode audio frames with the codec, if the codec is selected for the session). I'm not able to add EVRC specific code instead of GSM Specific code.Because in GSM, gsm_state is defined with several parameters.How could I define evrc_state? Is it really required? Because in GSM, open( ),encode( ),decode()..........these functions are having gsm_state and somehow getting values. http://www.pjsip.org/pjmedia/docs/html/structpjmedia__codec__op.htm Can anyone please temme how open() is working? gsm_state is structure which defines parameters like struct gsm_state { word dp0[ 280 ]; word e[ 50 ]; /* code.c */ word z1; /* preprocessing.c, Offset_com. */ longword L_z2; /* Offset_com. */ int mp; /* Preemphasis */ word u[8]; /* short_term_aly_filter.c */ word LARpp[2][8]; /* */ word j; /* */ word ltp_cut; /* long_term.c, LTP crosscorr. */ word nrp; /* 40 */ /* long_term.c, synthesis */ word v[9]; /* short_term.c, synthesis */ word msr; /* decoder.c, Postprocessing */ char verbose; /* only used if !NDEBUG */ char fast; /* only used if FAST */ char wav_fmt; /* only used if WAV49 defined */ unsigned char frame_index; /* odd/even chaining */ unsigned char frame_chain; /* half-byte to carry forward */ }; what are these variables? What would be the similarity with EVRC_STATE? Please help! -- Thanks and Regards. Sameer Prajapati Final year Undergraduate Student IIIT,Allahabad. #91-9999708959 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20090206/5393e4ac/attachment.html>
