mirror of
https://github.com/eliasstepanik/vdo.ninja.git
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727 lines
24 KiB
JavaScript
727 lines
24 KiB
JavaScript
/*
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The MIT License (MIT)
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Copyright (c) 2012-2020 [Muaz Khan](https://github.com/muaz-khan)
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Permission is hereby granted, free of charge, to any person obtaining a copy of
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this software and associated documentation files (the "Software"), to deal in
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the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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the Software, and to permit persons to whom the Software is furnished to do so,
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subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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// Sourced from: https://cdn.webrtc-experiment.com/CodecsHandler.js
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// *FILE HAS BEEN HEAVILY MODIFIED BY STEVE SEGUIN. ALL RIGHTS RESERVED WHERE APPLICABLE *
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var CodecsHandler = (function() {
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function preferCodec(sdp, codecName) {
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if (codecName){
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codecName = codecName.toLowerCase();
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}
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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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} else if (codecName === 'vp8' && info.vp8LineNumber === info.videoCodecNumbers[0]) {
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return sdp;
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} else if (codecName === 'vp9' && info.vp9LineNumber === info.videoCodecNumbers[0]) {
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return sdp;
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} else if (codecName === 'h264' && info.h264LineNumber === info.videoCodecNumbers[0]) {
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return sdp;
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} else if (codecName === 'h265' && info.h265LineNumber === info.videoCodecNumbers[0]) {
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return sdp;
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} else if (codecName === 'av1' && info.av1LineNumber === info.videoCodecNumbers[0]) {
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return sdp;
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}
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//} else if (codecName === 'red' && info.redLineNumber === info.videoCodecNumbers[0]) {
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// return sdp;
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//} else if (codecName === 'fec' && info.fecLineNumber === 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 preferAudioCodec(sdp, codecName) {
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if (codecName){
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codecName = codecName.toLowerCase();
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}
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var info = splitAudioLines(sdp);
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if (!info.audioCodecNumbers) {
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return sdp;
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} else if (codecName === 'opus' && info.opusLineNumber === info.audioCodecNumbers[0]) {
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return sdp;
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} else if (codecName === 'isac' && info.isacLineNumber === info.audioCodecNumbers[0]) {
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return sdp;
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} else if (codecName === 'g722' && info.g722LineNumber === info.audioCodecNumbers[0]) {
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return sdp;
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} else if (codecName === 'pcmu' && info.pcmuLineNumber === info.audioCodecNumbers[0]) {
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return sdp;
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} else if (codecName === 'pcma' && info.pcmaLineNumber === info.audioCodecNumbers[0]) {
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return sdp;
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} else if (codecName === 'red' && info.redLineNumber === info.audioCodecNumbers[0]) {
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return sdp;
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}
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sdp = preferAudioCodecHelper(sdp, codecName, info);
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return sdp;
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}
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function preferCodecHelper(sdp, codec, info) {
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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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} else 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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} else 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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} else if (codec === 'h265') {
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if (!info.h265LineNumber) {
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return sdp;
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}
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preferCodecNumber = info.h265LineNumber;
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} else if (codec === 'av1') {
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if (!info.av1LineNumber) {
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return sdp;
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}
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preferCodecNumber = info.av1LineNumber;
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} else {
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return sdp;
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}
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//} else if (codec === 'red') {
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// if (!info.redLineNumber) {
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// return sdp;
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// }
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// preferCodecNumber = info.redLineNumber;
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//} else if (codec === 'fec') {
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// if (!info.fecLineNumber) {
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// return sdp;
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// }
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// preferCodecNumber = info.fecLineNumber;
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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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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 preferAudioCodecHelper(sdp, codec, info) {
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var preferCodecNumber = '';
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if (codec === 'opus') {
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if (!info.opusLineNumber) {
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return sdp;
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}
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preferCodecNumber = info.opusLineNumber;
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} else if (codec === 'isac') {
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if (!info.isacLineNumber) {
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return sdp;
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}
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preferCodecNumber = info.isacLineNumber;
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} else if (codec === 'g722') {
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if (!info.g722LineNumber) {
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return sdp;
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}
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preferCodecNumber = info.g722LineNumber;
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} else if (codec === 'pcmu') {
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if (!info.pcmuLineNumber) {
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return sdp;
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}
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preferCodecNumber = info.pcmuLineNumber;
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} else if (codec === 'pcma') {
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if (!info.pcmaLineNumber) {
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return sdp;
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}
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preferCodecNumber = info.pcmaLineNumber;
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} else if (codec === 'red') {
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if (!info.redLineNumber) {
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return sdp;
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}
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preferCodecNumber = info.redLineNumber;
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}
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var newLine = info.audioCodecNumbersOriginal.split('SAVPF')[0] + 'SAVPF ';
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var newOrder = [preferCodecNumber];
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info.audioCodecNumbers.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.audioCodecNumbersOriginal, 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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var LINE = line.toUpperCase();
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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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if (LINE.indexOf('H265/90000') !== -1 && !info.h265LineNumber) {
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info.h265LineNumber = line.replace('a=rtpmap:', '').split(' ')[0];
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}
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if (LINE.indexOf('AV1X/90000') !== -1 && !info.av1LineNumber) {
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info.av1LineNumber = line.replace('a=rtpmap:', '').split(' ')[0];
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} else if (LINE.indexOf('AV1/90000') !== -1 && !info.av1LineNumber) {
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info.av1LineNumber = line.replace('a=rtpmap:', '').split(' ')[0];
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}
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//if (LINE.indexOf('RED/90000') !== -1 && !info.redLineNumber) {
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// info.redLineNumber = line.replace('a=rtpmap:', '').split(' ')[0];
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// }
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// if (LINE.indexOf('FEC/90000') !== -1 && !info.fecLineNumber) {
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// info.fecLineNumber = 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 splitAudioLines(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=audio') === 0) {
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info.audioCodecNumbers = [];
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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.audioCodecNumbers.push(codecNumber);
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info.audioCodecNumbersOriginal = line;
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});
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}
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var LINE = line.toLowerCase();
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if (LINE.indexOf('opus/48000') !== -1 && !info.opusLineNumber) {
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info.opusLineNumber = line.replace('a=rtpmap:', '').split(' ')[0];
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}
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if (LINE.indexOf('isac/32000') !== -1 && !info.isacLineNumber) {
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info.isacLineNumber = line.replace('a=rtpmap:', '').split(' ')[0];
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}
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if (LINE.indexOf('g722/8000') !== -1 && !info.g722LineNumber) {
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info.g722LineNumber = line.replace('a=rtpmap:', '').split(' ')[0];
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}
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if (LINE.indexOf('pcmu/8000') !== -1 && !info.pcmuLineNumber) {
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info.pcmuLineNumber = line.replace('a=rtpmap:', '').split(' ')[0];
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}
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if (LINE.indexOf('pcma/8000') !== -1 && !info.pcmaLineNumber) {
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info.pcmaLineNumber = line.replace('a=rtpmap:', '').split(' ')[0];
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}
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if (LINE.indexOf('red/48000') !== -1 && !info.redLineNumber) {
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info.redLineNumber = 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 extractSdp(sdpLine, pattern) {
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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 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:(\d+) nack\r\n/g, '');
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sdp = sdp.replace(/a=rtcp-fb:(\d+) nack pli\r\n/g, 'a=rtcp-fb:$1 pli\r\n');
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sdp = sdp.replace(/a=rtcp-fb:(\d+) pli nack\r\n/g, 'a=rtcp-fb:$1 pli\r\n');
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return sdp;
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}
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function disableREMB(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:(\d+) goog-remb\r\n/g, '');
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return sdp;
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}
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function disablePLI(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:(\d+) pli\r\n/g, '');
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sdp = sdp.replace(/a=rtcp-fb:(\d+) nack pli\r\n/g, 'a=rtcp-fb:$1 nack\r\n');
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sdp = sdp.replace(/a=rtcp-fb:(\d+) pli nack\r\n/g, 'a=rtcp-fb:$1 nack\r\n');
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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 getVideoBitrates(sdp) {
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var defaultBitrate = false;
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var sdpLines = sdp.split('\r\n');
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var mLineIndex = findLine(sdpLines, 'm=', 'video');
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if (mLineIndex === null) {
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return defaultBitrate;
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}
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var videoMLine = sdpLines[mLineIndex];
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var pattern = new RegExp('m=video\\s\\d+\\s[A-Z/]+\\s');
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var sendPayloadType = videoMLine.split(pattern)[1].split(' ')[0];
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var fmtpLine = sdpLines[findLine(sdpLines, 'a=rtpmap', sendPayloadType)];
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var codec = fmtpLine.split('a=rtpmap:' + sendPayloadType)[1].split('/')[0];
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var codecIndex = findLine(sdpLines, 'a=rtpmap', codec+'/90000');
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var codecPayload;
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if (codecIndex) {
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codecPayload = getCodecPayloadType(sdpLines[codecIndex]);
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}
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if (!codecPayload) {
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return defaultBitrate;
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}
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var codecDetails = findLine(sdpLines, 'a=fmtp:'+codecPayload);
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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 defaultBitrate;
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}
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var rtxFmtpLineIndex = findLine(sdpLines, 'a=fmtp:' + codecPayload.toString());
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if (rtxFmtpLineIndex !== null) {
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try {
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var maxBitrate = parseInt(sdpLines[rtxFmtpLineIndex].split("x-google-max-bitrate=")[1].split(";")[0]);
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var minBitrate = parseInt(sdpLines[rtxFmtpLineIndex].split("x-google-min-bitrate=")[1].split(";")[0]);
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} catch(e){
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rtxFmtpLineIndex = findLine(sdpLines, 'a=fmtp:' + codecPayload.toString());
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if (rtxFmtpLineIndex !== null) {
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try {
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var maxBitrate = parseInt(sdpLines[rtxFmtpLineIndex].split("x-google-max-bitrate=")[1].split(";")[0]);
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var minBitrate = parseInt(sdpLines[rtxFmtpLineIndex].split("x-google-min-bitrate=")[1].split(";")[0]);
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} catch(e){
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return defaultBitrate;
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}
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} else {
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return defaultBitrate;
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}
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}
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if (minBitrate>maxBitrate){
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maxBitrate = minBitrate;
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}
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if (maxBitrate<1){maxBitrate=1;}
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return maxBitrate
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} else {
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return defaultBitrate;
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}
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}
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function setVideoBitrates(sdp, params = false, codec=false) { // modified + Improved by Steve.
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if (codec){
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codec = codec.toUpperCase();
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} else{
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codec="VP8";
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}
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var sdpLines = sdp.split('\r\n');
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// Search for m line.
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var mLineIndex = findLine(sdpLines, 'm=', 'video');
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if (mLineIndex === null) {
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return sdp;
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}
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// Figure out the first codec payload type on the m=video SDP line.
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var videoMLine = sdpLines[mLineIndex];
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var pattern = new RegExp('m=video\\s\\d+\\s[A-Z/]+\\s');
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var sendPayloadType = videoMLine.split(pattern)[1].split(' ')[0];
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var fmtpLine = sdpLines[findLine(sdpLines, 'a=rtpmap', sendPayloadType)];
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var codecName = fmtpLine.split('a=rtpmap:' + sendPayloadType)[1].split('/')[0];
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codec = codecName || codec; // Try to find first Codec; else use expected/default
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params = params || {};
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var min_bitrate = "30";
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if (params.min){
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min_bitrate = params.min.toString() || '30';
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}
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var max_bitrate = "2500";
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if (params.max){
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max_bitrate = params.max.toString() || '2500';
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}
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var codecIndex = findLine(sdpLines, 'a=rtpmap', codec+'/90000');
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var codecPayload;
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if (codecIndex) {
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codecPayload = getCodecPayloadType(sdpLines[codecIndex]);
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}
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if (!codecPayload) {
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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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sdpLines[mLineIndex] += '\r\nb=AS:' + max_bitrate;
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sdp = sdpLines.join('\r\n');
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return sdp;
|
|
}
|
|
|
|
|
|
var rtxFmtpLineIndexChromium = findLine(sdpLines, 'a=fmtp:' + rtxPayload.toString());
|
|
|
|
if (rtxFmtpLineIndexChromium !== null){
|
|
var appendrtxNext = '\r\n';
|
|
appendrtxNext += 'a=fmtp:' + codecPayload + ' x-google-min-bitrate=' + min_bitrate + '; x-google-max-bitrate=' + max_bitrate;
|
|
sdpLines[rtxFmtpLineIndexChromium] = sdpLines[rtxFmtpLineIndexChromium].concat(appendrtxNext);
|
|
sdp = sdpLines.join('\r\n');
|
|
}
|
|
|
|
return sdp;
|
|
}
|
|
|
|
function setOpusAttributes(sdp, params, debug=false) {
|
|
params = params || {};
|
|
|
|
var sdpLines = sdp.split('\r\n');
|
|
|
|
var opusIndex = findLine(sdpLines, 'a=rtpmap', 'opus/48000');
|
|
var opusPayload;
|
|
if (opusIndex) {
|
|
opusPayload = getCodecPayloadType(sdpLines[opusIndex]);
|
|
}
|
|
|
|
if (!opusPayload) {
|
|
return sdp;
|
|
}
|
|
|
|
var opusFmtpLineIndex = findLine(sdpLines, 'a=fmtp:' + opusPayload.toString());
|
|
if (opusFmtpLineIndex === null) {
|
|
return sdp;
|
|
}
|
|
|
|
var appendOpusNext = '';
|
|
|
|
// Please see https://tools.ietf.org/html/rfc7587 for more details on OPUS settings
|
|
|
|
|
|
if (typeof params.minptime != 'undefined') { // max packet size in milliseconds
|
|
if (params.minptime != false) {
|
|
appendOpusNext += ';minptime:' + params.minptime; // 3, 5, 10, 20, 40, 60 and the default is 120. (20 is minimum recommended for webrtc)
|
|
}
|
|
}
|
|
|
|
if (typeof params.maxptime != 'undefined') { // max packet size in milliseconds
|
|
if (params.maxptime != false) {
|
|
appendOpusNext += ';maxptime:' + params.maxptime; // 3, 5, 10, 20, 40, 60 and the default is 120. (20 is minimum recommended for webrtc)
|
|
}
|
|
}
|
|
|
|
if (typeof params.ptime != 'undefined') { // packet size; webrtc doesn't support less than 10 or 20 I think.
|
|
if (params.ptime != false) {
|
|
appendOpusNext += ';ptime:' + params.ptime;
|
|
}
|
|
}
|
|
|
|
if (typeof params.stereo != 'undefined'){
|
|
if (params.stereo==0){
|
|
appendOpusNext += ';stereo=0;sprop-stereo=0'; // defaults to 0
|
|
} else if (params.stereo==1){
|
|
appendOpusNext += ';stereo=1;sprop-stereo=1'; // defaults to 0
|
|
} else if (params.stereo==2){
|
|
sdpLines[opusIndex] = sdpLines[opusIndex].replace("opus/48000/2", "multiopus/48000/6");
|
|
appendOpusNext += ';channel_mapping=0,4,1,2,3,5;num_streams=4;coupled_streams=2'; // Multi-channel 5.1 audio
|
|
}
|
|
}
|
|
|
|
if (typeof params.maxaveragebitrate != 'undefined') {
|
|
if (sdpLines[opusFmtpLineIndex].split("maxaveragebitrate=").length==1){
|
|
appendOpusNext += ';maxaveragebitrate=' + params.maxaveragebitrate; // default 32000? (kbps)
|
|
}
|
|
}
|
|
|
|
if (typeof params.maxplaybackrate != 'undefined') {
|
|
if (sdpLines[opusFmtpLineIndex].split("maxplaybackrate=").length==1){
|
|
appendOpusNext += ';maxplaybackrate=' + params.maxplaybackrate; // Default should be 48000 (hz) , 8000 to 48000 are valid options
|
|
}
|
|
}
|
|
|
|
if (typeof params.cbr != 'undefined') {
|
|
if (sdpLines[opusFmtpLineIndex].split("cbr=").length==1){
|
|
appendOpusNext += ';cbr=' + params.cbr; // default is 0 (vbr)
|
|
}
|
|
}
|
|
|
|
if (typeof params.dtx != 'undefined') {
|
|
if (params.dtx){
|
|
if (sdpLines[opusFmtpLineIndex].split("usedtx=").length==1){
|
|
appendOpusNext += ';usedtx=1';
|
|
}
|
|
}
|
|
}
|
|
|
|
if (typeof params.useinbandfec != 'undefined') { // useful for handling packet loss
|
|
if (sdpLines[opusFmtpLineIndex].split("useinbandfec=").length==1){
|
|
appendOpusNext += ';useinbandfec=' + params.useinbandfec; // Defaults to 0
|
|
} else {
|
|
sdpLines[opusFmtpLineIndex] = sdpLines[opusFmtpLineIndex].replace("useinbandfec="+(params.useinbandfec ? 0 : 1), "useinbandfec="+params.useinbandfec);
|
|
}
|
|
}
|
|
|
|
if (debug){
|
|
console.log();
|
|
}
|
|
|
|
sdpLines[opusFmtpLineIndex] = sdpLines[opusFmtpLineIndex].concat(appendOpusNext);
|
|
|
|
if (debug){
|
|
console.log("Adding to SDP (audio): "+appendOpusNext+" --> Result: "+sdpLines[opusFmtpLineIndex]);
|
|
}
|
|
|
|
sdp = sdpLines.join('\r\n');
|
|
return sdp;
|
|
}
|
|
|
|
|
|
function getOpusBitrate(sdp) {
|
|
|
|
var sdpLines = sdp.split('\r\n');
|
|
|
|
var opusIndex = findLine(sdpLines, 'a=rtpmap', 'opus/48000');
|
|
var opusPayload;
|
|
if (opusIndex) {
|
|
opusPayload = getCodecPayloadType(sdpLines[opusIndex]);
|
|
}
|
|
|
|
if (!opusPayload) {
|
|
return 0;
|
|
}
|
|
|
|
var opusFmtpLineIndex = findLine(sdpLines, 'a=fmtp:' + opusPayload.toString());
|
|
if (opusFmtpLineIndex === null) {
|
|
return 0;
|
|
}
|
|
|
|
var appendOpusNext = '';
|
|
|
|
if (sdpLines[opusFmtpLineIndex].split("maxaveragebitrate=").length>1){
|
|
var tmp = sdpLines[opusFmtpLineIndex].split("maxaveragebitrate=")[1];
|
|
tmp = tmp.split('\r')[0];
|
|
tmp = tmp.split('\n')[0];
|
|
tmp = tmp.split(';')[0];
|
|
tmp = parseInt(tmp);
|
|
return tmp;
|
|
}
|
|
return 32768;
|
|
}
|
|
|
|
function modifyDescLyra(modifiedSDP) { // WIP
|
|
if (!modifiedSDP.includes("m=audio")){ // don't bother modifying if no audio line found
|
|
return modifiedSDP;
|
|
}
|
|
///// Snippet based on Apache 2.0 licenced code. Source: https://github.com/Flash-Meeting/lyra-webrtc //////////
|
|
modifiedSDP = modifiedSDP.replace("SAVPF 111", "SAVPF 109 111").replace("a=rtpmap:111", "a=rtpmap:109 L16/16000/1\r\na=fmtp:109 ptime=20\r\na=rtpmap:111");
|
|
modifiedSDP = modifiedSDP.replace("a=rtpmap:106 CN/32000\r\n", "").replace("a=rtpmap:105 CN/16000\r\n", "").replace("a=rtpmap:13 CN/8000\r\n", "").replace(" 106 105 13", "");
|
|
///////////////////////////////
|
|
return modifiedSDP;
|
|
}
|
|
|
|
function modifyDescPCM(modifiedSDP, rate=32000, stereo=false, ptimeOverride=false) {
|
|
if (!modifiedSDP.includes("m=audio")){ // don't bother modifying if no audio line found
|
|
return modifiedSDP;
|
|
}
|
|
var ptime = 10;
|
|
if (ptimeOverride){
|
|
ptime = parseInt(ptimeOverride); // 10 seems to work with 48000, so might as well make it default
|
|
}
|
|
ptime = parseInt(ptime/10)*10;
|
|
if (ptime<10){
|
|
ptime = 10;
|
|
}
|
|
rate = parseInt(rate) || 32000;
|
|
|
|
|
|
if (!stereo && (rate>=48000)){
|
|
rate = 48000; // 44100 doesn't want to work for me, so we'll skip it.
|
|
ptime = 10; // 48000 only works with ptime=10
|
|
} else if (!stereo && rate>=44100){
|
|
rate = 44100; // 44100 doesn't want to work for me, so we'll skip it.
|
|
ptime = 10;
|
|
} else if (rate>=32000){
|
|
rate = 32000;
|
|
if (stereo){
|
|
ptime=10; // can be ptime = 20 if not stereo
|
|
} else if (ptime>20){
|
|
ptime=20;
|
|
}
|
|
} else if (rate>=16000){
|
|
rate = 16000;
|
|
if (stereo){
|
|
if (ptime>20){
|
|
ptime=20; // can be ptime = 20 if not stereo
|
|
}
|
|
} else if (ptime>40){
|
|
ptime=40;
|
|
}
|
|
} else {
|
|
rate = 8000;
|
|
if (stereo){
|
|
if (ptime>40){
|
|
ptime=40; // can be ptime = 20 if not stereo
|
|
}
|
|
}
|
|
}
|
|
|
|
if (stereo){
|
|
modifiedSDP = modifiedSDP.replace("SAVPF 111", "SAVPF 109 111").replace("a=rtpmap:111", "a=rtpmap:109 L16/"+rate+"/2\r\na=fmtp:109 ptime="+ptime+"\r\na=rtpmap:111");
|
|
} else {
|
|
modifiedSDP = modifiedSDP.replace("SAVPF 111", "SAVPF 109 111").replace("a=rtpmap:111", "a=rtpmap:109 L16/"+rate+"/1\r\na=fmtp:109 ptime="+ptime+"\r\na=rtpmap:111");
|
|
}
|
|
|
|
modifiedSDP = modifiedSDP.replace("a=rtpmap:106 CN/32000\r\n", "").replace("a=rtpmap:105 CN/16000\r\n", "").replace("a=rtpmap:13 CN/8000\r\n", "").replace(" 106 105 13", "");
|
|
return modifiedSDP;
|
|
}
|
|
|
|
|
|
return {
|
|
disableNACK: disableNACK,
|
|
|
|
disablePLI: disablePLI,
|
|
|
|
disableREMB: disableREMB,
|
|
|
|
modifyDescPCM: modifyDescPCM,
|
|
|
|
modifyDescLyra: modifyDescLyra,
|
|
|
|
getVideoBitrates: function(sdp) {
|
|
return getVideoBitrates(sdp);
|
|
},
|
|
|
|
setVideoBitrates: function(sdp, params, codec) {
|
|
return setVideoBitrates(sdp, params, codec);
|
|
},
|
|
setOpusAttributes: function(sdp, params, debug=false) {
|
|
return setOpusAttributes(sdp, params, debug);
|
|
},
|
|
|
|
getOpusBitrate: function(sdp){
|
|
return getOpusBitrate(sdp);
|
|
},
|
|
|
|
preferCodec: preferCodec,
|
|
|
|
preferAudioCodec: preferAudioCodec
|
|
};
|
|
})();
|
|
|