362 lines
12 KiB
JavaScript
362 lines
12 KiB
JavaScript
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// CodecsHandler.js
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var CodecsHandler = (function() {
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function preferCodec(sdp, codecName) {
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var info = splitLines(sdp);
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if (!info.videoCodecNumbers) {
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return sdp;
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}
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if (codecName === 'vp8' && info.vp8LineNumber === info.videoCodecNumbers[0]) {
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return sdp;
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}
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if (codecName === 'vp9' && info.vp9LineNumber === info.videoCodecNumbers[0]) {
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return sdp;
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}
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if (codecName === 'h264' && info.h264LineNumber === info.videoCodecNumbers[0]) {
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return sdp;
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}
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sdp = preferCodecHelper(sdp, codecName, info);
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return sdp;
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}
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function preferCodecHelper(sdp, codec, info, ignore) {
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var preferCodecNumber = '';
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if (codec === 'vp8') {
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if (!info.vp8LineNumber) {
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return sdp;
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}
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preferCodecNumber = info.vp8LineNumber;
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}
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if (codec === 'vp9') {
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if (!info.vp9LineNumber) {
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return sdp;
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}
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preferCodecNumber = info.vp9LineNumber;
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}
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if (codec === 'h264') {
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if (!info.h264LineNumber) {
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return sdp;
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}
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preferCodecNumber = info.h264LineNumber;
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}
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var newLine = info.videoCodecNumbersOriginal.split('SAVPF')[0] + 'SAVPF ';
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var newOrder = [preferCodecNumber];
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if (ignore) {
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newOrder = [];
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}
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info.videoCodecNumbers.forEach(function(codecNumber) {
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if (codecNumber === preferCodecNumber) return;
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newOrder.push(codecNumber);
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});
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newLine += newOrder.join(' ');
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sdp = sdp.replace(info.videoCodecNumbersOriginal, newLine);
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return sdp;
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}
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function splitLines(sdp) {
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var info = {};
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sdp.split('\n').forEach(function(line) {
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if (line.indexOf('m=video') === 0) {
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info.videoCodecNumbers = [];
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line.split('SAVPF')[1].split(' ').forEach(function(codecNumber) {
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codecNumber = codecNumber.trim();
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if (!codecNumber || !codecNumber.length) return;
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info.videoCodecNumbers.push(codecNumber);
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info.videoCodecNumbersOriginal = line;
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});
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}
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if (line.indexOf('VP8/90000') !== -1 && !info.vp8LineNumber) {
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info.vp8LineNumber = line.replace('a=rtpmap:', '').split(' ')[0];
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}
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if (line.indexOf('VP9/90000') !== -1 && !info.vp9LineNumber) {
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info.vp9LineNumber = line.replace('a=rtpmap:', '').split(' ')[0];
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}
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if (line.indexOf('H264/90000') !== -1 && !info.h264LineNumber) {
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info.h264LineNumber = line.replace('a=rtpmap:', '').split(' ')[0];
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}
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});
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return info;
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}
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function removeVPX(sdp) {
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var info = splitLines(sdp);
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// last parameter below means: ignore these codecs
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sdp = preferCodecHelper(sdp, 'vp9', info, true);
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sdp = preferCodecHelper(sdp, 'vp8', info, true);
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return sdp;
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}
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function disableNACK(sdp) {
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if (!sdp || typeof sdp !== 'string') {
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throw 'Invalid arguments.';
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}
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sdp = sdp.replace('a=rtcp-fb:126 nack\r\n', '');
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sdp = sdp.replace('a=rtcp-fb:126 nack pli\r\n', 'a=rtcp-fb:126 pli\r\n');
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sdp = sdp.replace('a=rtcp-fb:97 nack\r\n', '');
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sdp = sdp.replace('a=rtcp-fb:97 nack pli\r\n', 'a=rtcp-fb:97 pli\r\n');
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return sdp;
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}
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function prioritize(codecMimeType, peer) {
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if (!peer || !peer.getSenders || !peer.getSenders().length) {
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return;
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}
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if (!codecMimeType || typeof codecMimeType !== 'string') {
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throw 'Invalid arguments.';
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}
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peer.getSenders().forEach(function(sender) {
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var params = sender.getParameters();
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for (var i = 0; i < params.codecs.length; i++) {
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if (params.codecs[i].mimeType == codecMimeType) {
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params.codecs.unshift(params.codecs.splice(i, 1));
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break;
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}
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}
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sender.setParameters(params);
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});
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}
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function removeNonG722(sdp) {
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return sdp.replace(/m=audio ([0-9]+) RTP\/SAVPF ([0-9 ]*)/g, 'm=audio $1 RTP\/SAVPF 9');
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}
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function setBAS(sdp, bandwidth, isScreen) {
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if (!bandwidth) {
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return sdp;
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}
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if (typeof isFirefox !== 'undefined' && isFirefox) {
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return sdp;
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}
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if (isScreen) {
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if (!bandwidth.screen) {
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console.warn('It seems that you are not using bandwidth for screen. Screen sharing is expected to fail.');
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} else if (bandwidth.screen < 300) {
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console.warn('It seems that you are using wrong bandwidth value for screen. Screen sharing is expected to fail.');
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}
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}
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// if screen; must use at least 300kbs
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if (bandwidth.screen && isScreen) {
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sdp = sdp.replace(/b=AS([^\r\n]+\r\n)/g, '');
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sdp = sdp.replace(/a=mid:video\r\n/g, 'a=mid:video\r\nb=AS:' + bandwidth.screen + '\r\n');
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}
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// remove existing bandwidth lines
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if (bandwidth.audio || bandwidth.video) {
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sdp = sdp.replace(/b=AS([^\r\n]+\r\n)/g, '');
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}
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if (bandwidth.audio) {
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sdp = sdp.replace(/a=mid:audio\r\n/g, 'a=mid:audio\r\nb=AS:' + bandwidth.audio + '\r\n');
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}
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if (bandwidth.screen) {
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sdp = sdp.replace(/a=mid:video\r\n/g, 'a=mid:video\r\nb=AS:' + bandwidth.screen + '\r\n');
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} else if (bandwidth.video) {
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sdp = sdp.replace(/a=mid:video\r\n/g, 'a=mid:video\r\nb=AS:' + bandwidth.video + '\r\n');
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}
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return sdp;
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}
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// Find the line in sdpLines that starts with |prefix|, and, if specified,
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// contains |substr| (case-insensitive search).
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function findLine(sdpLines, prefix, substr) {
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return findLineInRange(sdpLines, 0, -1, prefix, substr);
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}
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// Find the line in sdpLines[startLine...endLine - 1] that starts with |prefix|
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// and, if specified, contains |substr| (case-insensitive search).
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function findLineInRange(sdpLines, startLine, endLine, prefix, substr) {
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var realEndLine = endLine !== -1 ? endLine : sdpLines.length;
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for (var i = startLine; i < realEndLine; ++i) {
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if (sdpLines[i].indexOf(prefix) === 0) {
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if (!substr ||
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sdpLines[i].toLowerCase().indexOf(substr.toLowerCase()) !== -1) {
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return i;
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}
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}
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}
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return null;
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}
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// Gets the codec payload type from an a=rtpmap:X line.
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function getCodecPayloadType(sdpLine) {
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var pattern = new RegExp('a=rtpmap:(\\d+) \\w+\\/\\d+');
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var result = sdpLine.match(pattern);
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return (result && result.length === 2) ? result[1] : null;
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}
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function setVideoBitrates(sdp, params) {
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params = params || {};
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var xgoogle_min_bitrate = params.min;
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var xgoogle_max_bitrate = params.max;
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var sdpLines = sdp.split('\r\n');
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// VP8
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var vp8Index = findLine(sdpLines, 'a=rtpmap', 'VP8/90000');
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var vp8Payload;
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if (vp8Index) {
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vp8Payload = getCodecPayloadType(sdpLines[vp8Index]);
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}
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if (!vp8Payload) {
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return sdp;
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}
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var rtxIndex = findLine(sdpLines, 'a=rtpmap', 'rtx/90000');
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var rtxPayload;
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if (rtxIndex) {
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rtxPayload = getCodecPayloadType(sdpLines[rtxIndex]);
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}
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if (!rtxIndex) {
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return sdp;
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}
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var rtxFmtpLineIndex = findLine(sdpLines, 'a=fmtp:' + rtxPayload.toString());
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if (rtxFmtpLineIndex !== null) {
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var appendrtxNext = '\r\n';
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appendrtxNext += 'a=fmtp:' + vp8Payload + ' x-google-min-bitrate=' + (xgoogle_min_bitrate || '228') + '; x-google-max-bitrate=' + (xgoogle_max_bitrate || '228');
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sdpLines[rtxFmtpLineIndex] = sdpLines[rtxFmtpLineIndex].concat(appendrtxNext);
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sdp = sdpLines.join('\r\n');
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}
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return sdp;
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}
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function setOpusAttributes(sdp, params) {
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params = params || {};
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var sdpLines = sdp.split('\r\n');
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// Opus
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var opusIndex = findLine(sdpLines, 'a=rtpmap', 'opus/48000');
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var opusPayload;
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if (opusIndex) {
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opusPayload = getCodecPayloadType(sdpLines[opusIndex]);
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}
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if (!opusPayload) {
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return sdp;
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}
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var opusFmtpLineIndex = findLine(sdpLines, 'a=fmtp:' + opusPayload.toString());
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if (opusFmtpLineIndex === null) {
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return sdp;
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}
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var appendOpusNext = '';
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appendOpusNext += '; stereo=' + (typeof params.stereo != 'undefined' ? params.stereo : '1');
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appendOpusNext += '; sprop-stereo=' + (typeof params['sprop-stereo'] != 'undefined' ? params['sprop-stereo'] : '1');
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if (typeof params.maxaveragebitrate != 'undefined') {
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appendOpusNext += '; maxaveragebitrate=' + (params.maxaveragebitrate || 128 * 1024 * 8);
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}
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if (typeof params.maxplaybackrate != 'undefined') {
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appendOpusNext += '; maxplaybackrate=' + (params.maxplaybackrate || 128 * 1024 * 8);
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}
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if (typeof params.cbr != 'undefined') {
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appendOpusNext += '; cbr=' + (typeof params.cbr != 'undefined' ? params.cbr : '1');
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}
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if (typeof params.useinbandfec != 'undefined') {
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appendOpusNext += '; useinbandfec=' + params.useinbandfec;
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}
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if (typeof params.usedtx != 'undefined') {
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appendOpusNext += '; usedtx=' + params.usedtx;
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}
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if (typeof params.maxptime != 'undefined') {
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appendOpusNext += '\r\na=maxptime:' + params.maxptime;
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}
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sdpLines[opusFmtpLineIndex] = sdpLines[opusFmtpLineIndex].concat(appendOpusNext);
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sdp = sdpLines.join('\r\n');
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return sdp;
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}
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// forceStereoAudio => via webrtcexample.com
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// requires getUserMedia => echoCancellation:false
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function forceStereoAudio(sdp) {
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var sdpLines = sdp.split('\r\n');
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var fmtpLineIndex = null;
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for (var i = 0; i < sdpLines.length; i++) {
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if (sdpLines[i].search('opus/48000') !== -1) {
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var opusPayload = extractSdp(sdpLines[i], /:(\d+) opus\/48000/i);
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break;
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}
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}
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for (var i = 0; i < sdpLines.length; i++) {
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if (sdpLines[i].search('a=fmtp') !== -1) {
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var payload = extractSdp(sdpLines[i], /a=fmtp:(\d+)/);
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if (payload === opusPayload) {
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fmtpLineIndex = i;
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break;
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}
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}
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}
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if (fmtpLineIndex === null) return sdp;
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sdpLines[fmtpLineIndex] = sdpLines[fmtpLineIndex].concat('; stereo=1; sprop-stereo=1');
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sdp = sdpLines.join('\r\n');
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return sdp;
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}
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return {
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removeVPX: removeVPX,
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disableNACK: disableNACK,
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prioritize: prioritize,
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removeNonG722: removeNonG722,
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setApplicationSpecificBandwidth: function(sdp, bandwidth, isScreen) {
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return setBAS(sdp, bandwidth, isScreen);
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},
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setVideoBitrates: function(sdp, params) {
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return setVideoBitrates(sdp, params);
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},
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setOpusAttributes: function(sdp, params) {
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return setOpusAttributes(sdp, params);
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},
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preferVP9: function(sdp) {
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return preferCodec(sdp, 'vp9');
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},
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preferCodec: preferCodec,
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forceStereoAudio: forceStereoAudio
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};
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})();
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// backward compatibility
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window.BandwidthHandler = CodecsHandler;
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