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| 1 /* | |
| 2 * libjingle | |
| 3 * Copyright 2015 Google Inc. | |
| 4 * | |
| 5 * Redistribution and use in source and binary forms, with or without | |
| 6 * modification, are permitted provided that the following conditions are met: | |
| 7 * | |
| 8 * 1. Redistributions of source code must retain the above copyright notice, | |
| 9 * this list of conditions and the following disclaimer. | |
| 10 * 2. Redistributions in binary form must reproduce the above copyright notice, | |
| 11 * this list of conditions and the following disclaimer in the documentation | |
| 12 * and/or other materials provided with the distribution. | |
| 13 * 3. The name of the author may not be used to endorse or promote products | |
| 14 * derived from this software without specific prior written permission. | |
| 15 * | |
| 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
| 17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
| 18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO | |
| 19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; | |
| 22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, | |
| 23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR | |
| 24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF | |
| 25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 26 */ | |
| 27 | |
| 28 #import "ARDSDPUtils.h" | |
| 29 | |
| 30 #import "RTCLogging.h" | |
| 31 #import "RTCSessionDescription.h" | |
| 32 | |
| 33 @implementation ARDSDPUtils | |
| 34 | |
| 35 + (RTCSessionDescription *) | |
| 36 descriptionForDescription:(RTCSessionDescription *)description | |
| 37 preferredVideoCodec:(NSString *)codec { | |
| 38 NSString *sdpString = description.description; | |
| 39 NSString *lineSeparator = @"\n"; | |
| 40 NSString *mLineSeparator = @" "; | |
| 41 // Copied from PeerConnectionClient.java. | |
| 42 // TODO(tkchin): Move this to a shared C++ file. | |
| 43 NSMutableArray *lines = | |
| 44 [NSMutableArray arrayWithArray: | |
| 45 [sdpString componentsSeparatedByString:lineSeparator]]; | |
| 46 NSInteger mLineIndex = -1; | |
| 47 NSString *codecRtpMap = nil; | |
| 48 // a=rtpmap:<payload type> <encoding name>/<clock rate> | |
| 49 // [/<encoding parameters>] | |
| 50 NSString *pattern = | |
| 51 [NSString stringWithFormat:@"^a=rtpmap:(\\d+) %@(/\\d+)+[\r]?$", codec]; | |
| 52 NSRegularExpression *regex = | |
| 53 [NSRegularExpression regularExpressionWithPattern:pattern | |
| 54 options:0 | |
| 55 error:nil]; | |
| 56 for (NSInteger i = 0; (i < lines.count) && (mLineIndex == -1 || !codecRtpMap); | |
| 57 ++i) { | |
| 58 NSString *line = lines[i]; | |
| 59 if ([line hasPrefix:@"m=video"]) { | |
| 60 mLineIndex = i; | |
| 61 continue; | |
| 62 } | |
| 63 NSTextCheckingResult *codecMatches = | |
| 64 [regex firstMatchInString:line | |
| 65 options:0 | |
| 66 range:NSMakeRange(0, line.length)]; | |
| 67 if (codecMatches) { | |
| 68 codecRtpMap = | |
| 69 [line substringWithRange:[codecMatches rangeAtIndex:1]]; | |
| 70 continue; | |
| 71 } | |
| 72 } | |
| 73 if (mLineIndex == -1) { | |
| 74 RTCLog(@"No m=video line, so can't prefer %@", codec); | |
| 75 return description; | |
| 76 } | |
| 77 if (!codecRtpMap) { | |
| 78 RTCLog(@"No rtpmap for %@", codec); | |
| 79 return description; | |
| 80 } | |
| 81 NSArray *origMLineParts = | |
| 82 [lines[mLineIndex] componentsSeparatedByString:mLineSeparator]; | |
| 83 if (origMLineParts.count > 3) { | |
| 84 NSMutableArray *newMLineParts = | |
| 85 [NSMutableArray arrayWithCapacity:origMLineParts.count]; | |
| 86 NSInteger origPartIndex = 0; | |
| 87 // Format is: m=<media> <port> <proto> <fmt> ... | |
| 88 [newMLineParts addObject:origMLineParts[origPartIndex++]]; | |
| 89 [newMLineParts addObject:origMLineParts[origPartIndex++]]; | |
| 90 [newMLineParts addObject:origMLineParts[origPartIndex++]]; | |
| 91 [newMLineParts addObject:codecRtpMap]; | |
| 92 for (; origPartIndex < origMLineParts.count; ++origPartIndex) { | |
| 93 if (![codecRtpMap isEqualToString:origMLineParts[origPartIndex]]) { | |
| 94 [newMLineParts addObject:origMLineParts[origPartIndex]]; | |
| 95 } | |
| 96 } | |
| 97 NSString *newMLine = | |
| 98 [newMLineParts componentsJoinedByString:mLineSeparator]; | |
| 99 [lines replaceObjectAtIndex:mLineIndex | |
| 100 withObject:newMLine]; | |
| 101 } else { | |
| 102 RTCLogWarning(@"Wrong SDP media description format: %@", lines[mLineIndex]); | |
| 103 } | |
| 104 NSString *mangledSdpString = [lines componentsJoinedByString:lineSeparator]; | |
| 105 return [[RTCSessionDescription alloc] initWithType:description.type | |
| 106 sdp:mangledSdpString]; | |
| 107 } | |
| 108 | |
| 109 @end | |
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Chromium Code Reviews
Issue 1235563006:
Move talk/examples/* to webrtc/examples. (Closed)
Base URL: https://chromium.googlesource.com/external/webrtc.git@master