71f6f4405c
First step towards supporting H264 on iOS. More tuning/experimentation required in future CLs. Tested using AppRTCDemo on iPhone6 + iPad Mini. Future work to get it working on OS/X, simulator (renders black screen currently) and with the Android AppRTCDemo. Currently protected with a compile time guard. BUG=4081 R=andrew@webrtc.org, haysc@webrtc.org, holmer@google.com, jiayl@webrtc.org, kjellander@webrtc.org, pbos@webrtc.org, phoglund@webrtc.org, stefan@webrtc.org Review URL: https://codereview.webrtc.org/1187573004. Cr-Commit-Position: refs/heads/master@{#9515}
109 lines
4.4 KiB
Objective-C
109 lines
4.4 KiB
Objective-C
/*
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* libjingle
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* Copyright 2015 Google Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#import "ARDSDPUtils.h"
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#import "RTCSessionDescription.h"
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@implementation ARDSDPUtils
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+ (RTCSessionDescription *)
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descriptionForDescription:(RTCSessionDescription *)description
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preferredVideoCodec:(NSString *)codec {
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NSString *sdpString = description.description;
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NSString *lineSeparator = @"\n";
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NSString *mLineSeparator = @" ";
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// Copied from PeerConnectionClient.java.
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// TODO(tkchin): Move this to a shared C++ file.
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NSMutableArray *lines =
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[NSMutableArray arrayWithArray:
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[sdpString componentsSeparatedByString:lineSeparator]];
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int mLineIndex = -1;
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NSString *codecRtpMap = nil;
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// a=rtpmap:<payload type> <encoding name>/<clock rate>
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// [/<encoding parameters>]
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NSString *pattern =
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[NSString stringWithFormat:@"^a=rtpmap:(\\d+) %@(/\\d+)+[\r]?$", codec];
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NSRegularExpression *regex =
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[NSRegularExpression regularExpressionWithPattern:pattern
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options:0
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error:nil];
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for (NSInteger i = 0; (i < lines.count) && (mLineIndex == -1 || !codecRtpMap);
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++i) {
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NSString *line = lines[i];
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if ([line hasPrefix:@"m=video"]) {
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mLineIndex = i;
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continue;
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}
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NSTextCheckingResult *codecMatches =
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[regex firstMatchInString:line
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options:0
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range:NSMakeRange(0, line.length)];
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if (codecMatches) {
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codecRtpMap =
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[line substringWithRange:[codecMatches rangeAtIndex:1]];
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continue;
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}
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}
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if (mLineIndex == -1) {
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NSLog(@"No m=video line, so can't prefer %@", codec);
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return description;
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}
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if (!codecRtpMap) {
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NSLog(@"No rtpmap for %@", codec);
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return description;
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}
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NSArray *origMLineParts =
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[lines[mLineIndex] componentsSeparatedByString:mLineSeparator];
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if (origMLineParts.count > 3) {
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NSMutableArray *newMLineParts =
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[NSMutableArray arrayWithCapacity:origMLineParts.count];
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NSInteger origPartIndex = 0;
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// Format is: m=<media> <port> <proto> <fmt> ...
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[newMLineParts addObject:origMLineParts[origPartIndex++]];
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[newMLineParts addObject:origMLineParts[origPartIndex++]];
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[newMLineParts addObject:origMLineParts[origPartIndex++]];
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[newMLineParts addObject:codecRtpMap];
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for (; origPartIndex < origMLineParts.count; ++origPartIndex) {
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if (![codecRtpMap isEqualToString:origMLineParts[origPartIndex]]) {
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[newMLineParts addObject:origMLineParts[origPartIndex]];
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}
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}
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NSString *newMLine =
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[newMLineParts componentsJoinedByString:mLineSeparator];
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[lines replaceObjectAtIndex:mLineIndex
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withObject:newMLine];
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} else {
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NSLog(@"Wrong SDP media description format: %@", lines[mLineIndex]);
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}
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NSString *mangledSdpString = [lines componentsJoinedByString:lineSeparator];
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return [[RTCSessionDescription alloc] initWithType:description.type
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sdp:mangledSdpString];
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}
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@end
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