Javascript function snippet. It can use for remove video codec from your WebRTC SDP. When you want to test particular video codec, it's very useful!
WebRTCのSDPから特定のコーデックを削除する関数です。 特定のコーデックで試験を行いたい場合、非常に便利にご利用になれます。
- Firefox 44.0.2
- Chrome 48.0.2564.116
- Chrome 51.0.2665.0 canary with H.264 Option!
Like this!
peer_connection.createOffer(function(offer) {
offer.sdp = removeCodec(offer.sdp, "H264");
offer.sdp = removeCodec(offer.sdp, "VP9");
peer_connection.setLocalDescription(offer);
}, function(e) {}, media_constraints);＃ removeCodec function
Sorry! multistream IS NOT supported.
function removeCodec(orgsdp, codec) {
var internalFunc = function(sdp) {
var codecre = new RegExp('(a=rtpmap:(\\d*) ' + codec + '\/90000\\r\\n)');
var rtpmaps = sdp.match(codecre);
if(rtpmaps == null || rtpmaps.length <= 2) {
return sdp;
}
var rtpmap = rtpmaps[2];
var modsdp = sdp.replace(codecre, "");
var rtcpre = new RegExp('(a=rtcp-fb:' + rtpmap + '.*\r\n)', 'g');
modsdp = modsdp.replace(rtcpre, "");
var fmtpre = new RegExp('(a=fmtp:' + rtpmap + '.*\r\n)', 'g');
modsdp = modsdp.replace(fmtpre, "");
var aptpre = new RegExp('(a=fmtp:(\\d*) apt=' + rtpmap + '\\r\\n)');
var aptmaps = modsdp.match(aptpre);
var fmtpmap = "";
if(aptmaps != null && aptmaps.length >= 3) {
fmtpmap = aptmaps[2];
modsdp = modsdp.replace(aptpre, "");
var rtppre = new RegExp('(a=rtpmap:' + fmtpmap + '.*\r\n)', 'g');
modsdp = modsdp.replace(rtppre, "");
}
var videore = /(m=video.*\r\n)/;
var videolines = modsdp.match(videore);
if(videolines != null) {
//If many m=video are found in SDP, this program doesn't work.
var videoline = videolines[0].substring(0, videolines[0].length - 2);
var videoelem = videoline.split(" ");
var modvideoline = videoelem[0];
for(var i = 1; i < videoelem.length; i++) {
if(videoelem[i] == rtpmap || videoelem[i] == fmtpmap) {
continue;
}
modvideoline += " " + videoelem[i];
}
modvideoline += "\r\n";
modsdp = modsdp.replace(videore, modvideoline);
}
return internalFunc(modsdp);
};
return internalFunc(orgsdp);
}CC0