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      1 /*
      2  * libjingle
      3  * Copyright 2013, 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 #if !defined(__has_feature) || !__has_feature(objc_arc)
     29 #error "This file requires ARC support."
     30 #endif
     31 
     32 #import "RTCSessionDescriptionSyncObserver.h"
     33 
     34 #import "RTCSessionDescription.h"
     35 
     36 @interface RTCSessionDescriptionSyncObserver()
     37 
     38 // CondVar used to wait for, and signal arrival of, an SDP-related callback.
     39 @property(nonatomic, strong) NSCondition *condition;
     40 // Whether an SDP-related callback has fired; cleared before wait returns.
     41 @property(atomic, assign) BOOL signaled;
     42 
     43 @end
     44 
     45 @implementation RTCSessionDescriptionSyncObserver
     46 
     47 - (id)init {
     48   if ((self = [super init])) {
     49     if (!(_condition = [[NSCondition alloc] init]))
     50       self = nil;
     51   }
     52   return self;
     53 }
     54 
     55 - (void)signal {
     56   self.signaled = YES;
     57   [self.condition signal];
     58 }
     59 
     60 - (void)wait {
     61   [self.condition lock];
     62   if (!self.signaled)
     63     [self.condition wait];
     64   self.signaled = NO;
     65   [self.condition unlock];
     66 }
     67 
     68 #pragma mark - RTCSessionDescriptonDelegate methods
     69 - (void)peerConnection:(RTCPeerConnection *)peerConnection
     70     didCreateSessionDescription:(RTCSessionDescription *)sdp
     71                           error:(NSError *)error {
     72   [self.condition lock];
     73   if (error) {
     74     self.success = NO;
     75     self.error = error.description;
     76   } else {
     77     self.success = YES;
     78     self.sessionDescription = sdp;
     79   }
     80   [self signal];
     81   [self.condition unlock];
     82 }
     83 
     84 - (void)peerConnection:(RTCPeerConnection *)peerConnection
     85     didSetSessionDescriptionWithError:(NSError *)error {
     86   [self.condition lock];
     87   if (error) {
     88     self.success = NO;
     89     self.error = error.description;
     90   } else {
     91     self.success = YES;
     92   }
     93   [self signal];
     94   [self.condition unlock];
     95 }
     96 
     97 @end
     98