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+/*
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+ * Nextcloud Talk application
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+ *
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+ * @author Mario Danic
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+ * Copyright (C) 2017 Mario Danic <mario@lovelyhq.com>
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+ *
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+ * This program is free software: you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation, either version 3 of the License, or
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+ * at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
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+ *
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+ * Original code:
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+ *
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+ *
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+ * Copyright 2016 The WebRTC Project Authors. All rights reserved.
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+ *
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+ * Use of this source code is governed by a BSD-style license
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+ * that can be found in the LICENSE file in the root of the source
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+ * tree. An additional intellectual property rights grant can be found
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+ * in the file PATENTS. All contributing project authors may
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+ * be found in the AUTHORS file in the root of the source tree.
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+ */
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+
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+package com.nextcloud.talk.webrtc;
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+
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+import android.util.Log;
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+
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+import java.util.ArrayList;
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+import java.util.Arrays;
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+import java.util.Iterator;
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+import java.util.List;
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+import java.util.regex.Matcher;
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+import java.util.regex.Pattern;
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+
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+public class MagicWebRTCUtils {
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+ private static final String TAG = "MagicWebRTCUtils";
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+
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+ public static String preferCodec(String sdpDescription, String codec, boolean isAudio) {
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+ final String[] lines = sdpDescription.split("\r\n");
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+ final int mLineIndex = findMediaDescriptionLine(isAudio, lines);
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+ if (mLineIndex == -1) {
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+ Log.w(TAG, "No mediaDescription line, so can't prefer " + codec);
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+ return sdpDescription;
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+ }
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+ // A list with all the payload types with name |codec|. The payload types are integers in the
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+ // range 96-127, but they are stored as strings here.
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+ final List<String> codecPayloadTypes = new ArrayList<String>();
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+ // a=rtpmap:<payload type> <encoding name>/<clock rate> [/<encoding parameters>]
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+ final Pattern codecPattern = Pattern.compile("^a=rtpmap:(\\d+) " + codec + "(/\\d+)+[\r]?$");
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+ for (int i = 0; i < lines.length; ++i) {
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+ Matcher codecMatcher = codecPattern.matcher(lines[i]);
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+ if (codecMatcher.matches()) {
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+ codecPayloadTypes.add(codecMatcher.group(1));
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+ }
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+ }
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+ if (codecPayloadTypes.isEmpty()) {
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+ Log.w(TAG, "No payload types with name " + codec);
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+ return sdpDescription;
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+ }
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+
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+ final String newMLine = movePayloadTypesToFront(codecPayloadTypes, lines[mLineIndex]);
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+ if (newMLine == null) {
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+ return sdpDescription;
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+ }
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+ Log.d(TAG, "Change media description from: " + lines[mLineIndex] + " to " + newMLine);
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+ lines[mLineIndex] = newMLine;
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+ return joinString(Arrays.asList(lines), "\r\n", true /* delimiterAtEnd */);
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+ }
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+
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+ /** Returns the line number containing "m=audio|video", or -1 if no such line exists. */
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+ private static int findMediaDescriptionLine(boolean isAudio, String[] sdpLines) {
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+ final String mediaDescription = isAudio ? "m=audio " : "m=video ";
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+ for (int i = 0; i < sdpLines.length; ++i) {
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+ if (sdpLines[i].startsWith(mediaDescription)) {
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+ return i;
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+ }
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+ }
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+ return -1;
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+ }
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+
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+ private static String movePayloadTypesToFront(List<String> preferredPayloadTypes, String mLine) {
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+ // The format of the media description line should be: m=<media> <port> <proto> <fmt> ...
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+ final List<String> origLineParts = Arrays.asList(mLine.split(" "));
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+ if (origLineParts.size() <= 3) {
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+ Log.e(TAG, "Wrong SDP media description format: " + mLine);
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+ return null;
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+ }
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+ final List<String> header = origLineParts.subList(0, 3);
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+ final List<String> unpreferredPayloadTypes =
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+ new ArrayList<String>(origLineParts.subList(3, origLineParts.size()));
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+ unpreferredPayloadTypes.removeAll(preferredPayloadTypes);
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+ // Reconstruct the line with |preferredPayloadTypes| moved to the beginning of the payload
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+ // types.
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+ final List<String> newLineParts = new ArrayList<String>();
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+ newLineParts.addAll(header);
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+ newLineParts.addAll(preferredPayloadTypes);
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+ newLineParts.addAll(unpreferredPayloadTypes);
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+ return joinString(newLineParts, " ", false /* delimiterAtEnd */);
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+ }
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+
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+ private static String joinString(
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+ Iterable<? extends CharSequence> s, String delimiter, boolean delimiterAtEnd) {
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+ Iterator<? extends CharSequence> iter = s.iterator();
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+ if (!iter.hasNext()) {
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+ return "";
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+ }
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+ StringBuilder buffer = new StringBuilder(iter.next());
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+ while (iter.hasNext()) {
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+ buffer.append(delimiter).append(iter.next());
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+ }
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+ if (delimiterAtEnd) {
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+ buffer.append(delimiter);
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+ }
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+ return buffer.toString();
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+ }
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+
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+}
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Mario Danic