blob: 1020621cc1bd2b91340963ac20609688aaacd8f6 [file] [log] [blame]
/*
* Copyright 2014 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#import "ARDAppClient+Internal.h"
#import "WebRTC/RTCAVFoundationVideoSource.h"
#import "WebRTC/RTCAudioTrack.h"
#import "WebRTC/RTCConfiguration.h"
#import "WebRTC/RTCFileLogger.h"
#import "WebRTC/RTCIceServer.h"
#import "WebRTC/RTCLogging.h"
#import "WebRTC/RTCMediaConstraints.h"
#import "WebRTC/RTCMediaStream.h"
#import "WebRTC/RTCPeerConnectionFactory.h"
#import "WebRTC/RTCRtpSender.h"
#import "WebRTC/RTCTracing.h"
#import "ARDAppEngineClient.h"
#import "ARDCEODTURNClient.h"
#import "ARDJoinResponse.h"
#import "ARDMessageResponse.h"
#import "ARDSDPUtils.h"
#import "ARDSignalingMessage.h"
#import "ARDUtilities.h"
#import "ARDWebSocketChannel.h"
#import "RTCIceCandidate+JSON.h"
#import "RTCSessionDescription+JSON.h"
static NSString * const kARDDefaultSTUNServerUrl =
@"stun:stun.l.google.com:19302";
// TODO(tkchin): figure out a better username for CEOD statistics.
static NSString * const kARDTurnRequestUrl =
@"https://computeengineondemand.appspot.com"
@"/turn?username=iapprtc&key=4080218913";
static NSString * const kARDAppClientErrorDomain = @"ARDAppClient";
static NSInteger const kARDAppClientErrorUnknown = -1;
static NSInteger const kARDAppClientErrorRoomFull = -2;
static NSInteger const kARDAppClientErrorCreateSDP = -3;
static NSInteger const kARDAppClientErrorSetSDP = -4;
static NSInteger const kARDAppClientErrorInvalidClient = -5;
static NSInteger const kARDAppClientErrorInvalidRoom = -6;
static NSString * const kARDMediaStreamId = @"ARDAMS";
static NSString * const kARDAudioTrackId = @"ARDAMSa0";
static NSString * const kARDVideoTrackId = @"ARDAMSv0";
// TODO(tkchin): Add these as UI options.
static BOOL const kARDAppClientEnableTracing = NO;
static BOOL const kARDAppClientEnableRtcEventLog = YES;
static int64_t const kARDAppClientAecDumpMaxSizeInBytes = 5e6; // 5 MB.
static int64_t const kARDAppClientRtcEventLogMaxSizeInBytes = 5e6; // 5 MB.
// We need a proxy to NSTimer because it causes a strong retain cycle. When
// using the proxy, |invalidate| must be called before it properly deallocs.
@interface ARDTimerProxy : NSObject
- (instancetype)initWithInterval:(NSTimeInterval)interval
repeats:(BOOL)repeats
timerHandler:(void (^)(void))timerHandler;
- (void)invalidate;
@end
@implementation ARDTimerProxy {
NSTimer *_timer;
void (^_timerHandler)(void);
}
- (instancetype)initWithInterval:(NSTimeInterval)interval
repeats:(BOOL)repeats
timerHandler:(void (^)(void))timerHandler {
NSParameterAssert(timerHandler);
if (self = [super init]) {
_timerHandler = timerHandler;
_timer = [NSTimer scheduledTimerWithTimeInterval:interval
target:self
selector:@selector(timerDidFire:)
userInfo:nil
repeats:repeats];
}
return self;
}
- (void)invalidate {
[_timer invalidate];
}
- (void)timerDidFire:(NSTimer *)timer {
_timerHandler();
}
@end
@implementation ARDAppClient {
RTCFileLogger *_fileLogger;
ARDTimerProxy *_statsTimer;
}
@synthesize shouldGetStats = _shouldGetStats;
@synthesize state = _state;
@synthesize delegate = _delegate;
@synthesize roomServerClient = _roomServerClient;
@synthesize channel = _channel;
@synthesize loopbackChannel = _loopbackChannel;
@synthesize turnClient = _turnClient;
@synthesize peerConnection = _peerConnection;
@synthesize factory = _factory;
@synthesize messageQueue = _messageQueue;
@synthesize isTurnComplete = _isTurnComplete;
@synthesize hasReceivedSdp = _hasReceivedSdp;
@synthesize roomId = _roomId;
@synthesize clientId = _clientId;
@synthesize isInitiator = _isInitiator;
@synthesize iceServers = _iceServers;
@synthesize webSocketURL = _websocketURL;
@synthesize webSocketRestURL = _websocketRestURL;
@synthesize defaultPeerConnectionConstraints =
_defaultPeerConnectionConstraints;
@synthesize isLoopback = _isLoopback;
@synthesize isAudioOnly = _isAudioOnly;
@synthesize shouldMakeAecDump = _shouldMakeAecDump;
@synthesize shouldUseLevelControl = _shouldUseLevelControl;
- (instancetype)init {
if (self = [super init]) {
_roomServerClient = [[ARDAppEngineClient alloc] init];
NSURL *turnRequestURL = [NSURL URLWithString:kARDTurnRequestUrl];
_turnClient = [[ARDCEODTURNClient alloc] initWithURL:turnRequestURL];
[self configure];
}
return self;
}
- (instancetype)initWithDelegate:(id<ARDAppClientDelegate>)delegate {
if (self = [super init]) {
_roomServerClient = [[ARDAppEngineClient alloc] init];
_delegate = delegate;
NSURL *turnRequestURL = [NSURL URLWithString:kARDTurnRequestUrl];
_turnClient = [[ARDCEODTURNClient alloc] initWithURL:turnRequestURL];
[self configure];
}
return self;
}
// TODO(tkchin): Provide signaling channel factory interface so we can recreate
// channel if we need to on network failure. Also, make this the default public
// constructor.
- (instancetype)initWithRoomServerClient:(id<ARDRoomServerClient>)rsClient
signalingChannel:(id<ARDSignalingChannel>)channel
turnClient:(id<ARDTURNClient>)turnClient
delegate:(id<ARDAppClientDelegate>)delegate {
NSParameterAssert(rsClient);
NSParameterAssert(channel);
NSParameterAssert(turnClient);
if (self = [super init]) {
_roomServerClient = rsClient;
_channel = channel;
_turnClient = turnClient;
_delegate = delegate;
[self configure];
}
return self;
}
- (void)configure {
_factory = [[RTCPeerConnectionFactory alloc] init];
_messageQueue = [NSMutableArray array];
_iceServers = [NSMutableArray arrayWithObject:[self defaultSTUNServer]];
_fileLogger = [[RTCFileLogger alloc] init];
[_fileLogger start];
}
- (void)dealloc {
self.shouldGetStats = NO;
[self disconnect];
}
- (void)setShouldGetStats:(BOOL)shouldGetStats {
if (_shouldGetStats == shouldGetStats) {
return;
}
if (shouldGetStats) {
__weak ARDAppClient *weakSelf = self;
_statsTimer = [[ARDTimerProxy alloc] initWithInterval:1
repeats:YES
timerHandler:^{
ARDAppClient *strongSelf = weakSelf;
[strongSelf.peerConnection statsForTrack:nil
statsOutputLevel:RTCStatsOutputLevelDebug
completionHandler:^(NSArray *stats) {
dispatch_async(dispatch_get_main_queue(), ^{
ARDAppClient *strongSelf = weakSelf;
[strongSelf.delegate appClient:strongSelf didGetStats:stats];
});
}];
}];
} else {
[_statsTimer invalidate];
_statsTimer = nil;
}
_shouldGetStats = shouldGetStats;
}
- (void)setState:(ARDAppClientState)state {
if (_state == state) {
return;
}
_state = state;
[_delegate appClient:self didChangeState:_state];
}
- (void)connectToRoomWithId:(NSString *)roomId
isLoopback:(BOOL)isLoopback
isAudioOnly:(BOOL)isAudioOnly
shouldMakeAecDump:(BOOL)shouldMakeAecDump
shouldUseLevelControl:(BOOL)shouldUseLevelControl {
NSParameterAssert(roomId.length);
NSParameterAssert(_state == kARDAppClientStateDisconnected);
_isLoopback = isLoopback;
_isAudioOnly = isAudioOnly;
_shouldMakeAecDump = shouldMakeAecDump;
_shouldUseLevelControl = shouldUseLevelControl;
self.state = kARDAppClientStateConnecting;
#if defined(WEBRTC_IOS)
if (kARDAppClientEnableTracing) {
NSString *filePath = [self documentsFilePathForFileName:@"webrtc-trace.txt"];
RTCStartInternalCapture(filePath);
}
#endif
// Request TURN.
__weak ARDAppClient *weakSelf = self;
[_turnClient requestServersWithCompletionHandler:^(NSArray *turnServers,
NSError *error) {
if (error) {
RTCLogError("Error retrieving TURN servers: %@",
error.localizedDescription);
}
ARDAppClient *strongSelf = weakSelf;
[strongSelf.iceServers addObjectsFromArray:turnServers];
strongSelf.isTurnComplete = YES;
[strongSelf startSignalingIfReady];
}];
// Join room on room server.
[_roomServerClient joinRoomWithRoomId:roomId
isLoopback:isLoopback
completionHandler:^(ARDJoinResponse *response, NSError *error) {
ARDAppClient *strongSelf = weakSelf;
if (error) {
[strongSelf.delegate appClient:strongSelf didError:error];
return;
}
NSError *joinError =
[[strongSelf class] errorForJoinResultType:response.result];
if (joinError) {
RTCLogError(@"Failed to join room:%@ on room server.", roomId);
[strongSelf disconnect];
[strongSelf.delegate appClient:strongSelf didError:joinError];
return;
}
RTCLog(@"Joined room:%@ on room server.", roomId);
strongSelf.roomId = response.roomId;
strongSelf.clientId = response.clientId;
strongSelf.isInitiator = response.isInitiator;
for (ARDSignalingMessage *message in response.messages) {
if (message.type == kARDSignalingMessageTypeOffer ||
message.type == kARDSignalingMessageTypeAnswer) {
strongSelf.hasReceivedSdp = YES;
[strongSelf.messageQueue insertObject:message atIndex:0];
} else {
[strongSelf.messageQueue addObject:message];
}
}
strongSelf.webSocketURL = response.webSocketURL;
strongSelf.webSocketRestURL = response.webSocketRestURL;
[strongSelf registerWithColliderIfReady];
[strongSelf startSignalingIfReady];
}];
}
- (void)disconnect {
if (_state == kARDAppClientStateDisconnected) {
return;
}
if (self.hasJoinedRoomServerRoom) {
[_roomServerClient leaveRoomWithRoomId:_roomId
clientId:_clientId
completionHandler:nil];
}
if (_channel) {
if (_channel.state == kARDSignalingChannelStateRegistered) {
// Tell the other client we're hanging up.
ARDByeMessage *byeMessage = [[ARDByeMessage alloc] init];
[_channel sendMessage:byeMessage];
}
// Disconnect from collider.
_channel = nil;
}
_clientId = nil;
_roomId = nil;
_isInitiator = NO;
_hasReceivedSdp = NO;
_messageQueue = [NSMutableArray array];
#if defined(WEBRTC_IOS)
[_factory stopAecDump];
[_peerConnection stopRtcEventLog];
#endif
_peerConnection = nil;
self.state = kARDAppClientStateDisconnected;
#if defined(WEBRTC_IOS)
RTCStopInternalCapture();
#endif
}
#pragma mark - ARDSignalingChannelDelegate
- (void)channel:(id<ARDSignalingChannel>)channel
didReceiveMessage:(ARDSignalingMessage *)message {
switch (message.type) {
case kARDSignalingMessageTypeOffer:
case kARDSignalingMessageTypeAnswer:
// Offers and answers must be processed before any other message, so we
// place them at the front of the queue.
_hasReceivedSdp = YES;
[_messageQueue insertObject:message atIndex:0];
break;
case kARDSignalingMessageTypeCandidate:
case kARDSignalingMessageTypeCandidateRemoval:
[_messageQueue addObject:message];
break;
case kARDSignalingMessageTypeBye:
// Disconnects can be processed immediately.
[self processSignalingMessage:message];
return;
}
[self drainMessageQueueIfReady];
}
- (void)channel:(id<ARDSignalingChannel>)channel
didChangeState:(ARDSignalingChannelState)state {
switch (state) {
case kARDSignalingChannelStateOpen:
break;
case kARDSignalingChannelStateRegistered:
break;
case kARDSignalingChannelStateClosed:
case kARDSignalingChannelStateError:
// TODO(tkchin): reconnection scenarios. Right now we just disconnect
// completely if the websocket connection fails.
[self disconnect];
break;
}
}
#pragma mark - RTCPeerConnectionDelegate
// Callbacks for this delegate occur on non-main thread and need to be
// dispatched back to main queue as needed.
- (void)peerConnection:(RTCPeerConnection *)peerConnection
didChangeSignalingState:(RTCSignalingState)stateChanged {
RTCLog(@"Signaling state changed: %ld", (long)stateChanged);
}
- (void)peerConnection:(RTCPeerConnection *)peerConnection
didAddStream:(RTCMediaStream *)stream {
dispatch_async(dispatch_get_main_queue(), ^{
RTCLog(@"Received %lu video tracks and %lu audio tracks",
(unsigned long)stream.videoTracks.count,
(unsigned long)stream.audioTracks.count);
if (stream.videoTracks.count) {
RTCVideoTrack *videoTrack = stream.videoTracks[0];
[_delegate appClient:self didReceiveRemoteVideoTrack:videoTrack];
}
});
}
- (void)peerConnection:(RTCPeerConnection *)peerConnection
didRemoveStream:(RTCMediaStream *)stream {
RTCLog(@"Stream was removed.");
}
- (void)peerConnectionShouldNegotiate:(RTCPeerConnection *)peerConnection {
RTCLog(@"WARNING: Renegotiation needed but unimplemented.");
}
- (void)peerConnection:(RTCPeerConnection *)peerConnection
didChangeIceConnectionState:(RTCIceConnectionState)newState {
RTCLog(@"ICE state changed: %ld", (long)newState);
dispatch_async(dispatch_get_main_queue(), ^{
[_delegate appClient:self didChangeConnectionState:newState];
});
}
- (void)peerConnection:(RTCPeerConnection *)peerConnection
didChangeIceGatheringState:(RTCIceGatheringState)newState {
RTCLog(@"ICE gathering state changed: %ld", (long)newState);
}
- (void)peerConnection:(RTCPeerConnection *)peerConnection
didGenerateIceCandidate:(RTCIceCandidate *)candidate {
dispatch_async(dispatch_get_main_queue(), ^{
ARDICECandidateMessage *message =
[[ARDICECandidateMessage alloc] initWithCandidate:candidate];
[self sendSignalingMessage:message];
});
}
- (void)peerConnection:(RTCPeerConnection *)peerConnection
didRemoveIceCandidates:(NSArray<RTCIceCandidate *> *)candidates {
dispatch_async(dispatch_get_main_queue(), ^{
ARDICECandidateRemovalMessage *message =
[[ARDICECandidateRemovalMessage alloc]
initWithRemovedCandidates:candidates];
[self sendSignalingMessage:message];
});
}
- (void)peerConnection:(RTCPeerConnection *)peerConnection
didOpenDataChannel:(RTCDataChannel *)dataChannel {
}
#pragma mark - RTCSessionDescriptionDelegate
// Callbacks for this delegate occur on non-main thread and need to be
// dispatched back to main queue as needed.
- (void)peerConnection:(RTCPeerConnection *)peerConnection
didCreateSessionDescription:(RTCSessionDescription *)sdp
error:(NSError *)error {
dispatch_async(dispatch_get_main_queue(), ^{
if (error) {
RTCLogError(@"Failed to create session description. Error: %@", error);
[self disconnect];
NSDictionary *userInfo = @{
NSLocalizedDescriptionKey: @"Failed to create session description.",
};
NSError *sdpError =
[[NSError alloc] initWithDomain:kARDAppClientErrorDomain
code:kARDAppClientErrorCreateSDP
userInfo:userInfo];
[_delegate appClient:self didError:sdpError];
return;
}
// Prefer H264 if available.
RTCSessionDescription *sdpPreferringH264 =
[ARDSDPUtils descriptionForDescription:sdp
preferredVideoCodec:@"H264"];
__weak ARDAppClient *weakSelf = self;
[_peerConnection setLocalDescription:sdpPreferringH264
completionHandler:^(NSError *error) {
ARDAppClient *strongSelf = weakSelf;
[strongSelf peerConnection:strongSelf.peerConnection
didSetSessionDescriptionWithError:error];
}];
ARDSessionDescriptionMessage *message =
[[ARDSessionDescriptionMessage alloc]
initWithDescription:sdpPreferringH264];
[self sendSignalingMessage:message];
});
}
- (void)peerConnection:(RTCPeerConnection *)peerConnection
didSetSessionDescriptionWithError:(NSError *)error {
dispatch_async(dispatch_get_main_queue(), ^{
if (error) {
RTCLogError(@"Failed to set session description. Error: %@", error);
[self disconnect];
NSDictionary *userInfo = @{
NSLocalizedDescriptionKey: @"Failed to set session description.",
};
NSError *sdpError =
[[NSError alloc] initWithDomain:kARDAppClientErrorDomain
code:kARDAppClientErrorSetSDP
userInfo:userInfo];
[_delegate appClient:self didError:sdpError];
return;
}
// If we're answering and we've just set the remote offer we need to create
// an answer and set the local description.
if (!_isInitiator && !_peerConnection.localDescription) {
RTCMediaConstraints *constraints = [self defaultAnswerConstraints];
__weak ARDAppClient *weakSelf = self;
[_peerConnection answerForConstraints:constraints
completionHandler:^(RTCSessionDescription *sdp,
NSError *error) {
ARDAppClient *strongSelf = weakSelf;
[strongSelf peerConnection:strongSelf.peerConnection
didCreateSessionDescription:sdp
error:error];
}];
}
});
}
#pragma mark - Private
#if defined(WEBRTC_IOS)
- (NSString *)documentsFilePathForFileName:(NSString *)fileName {
NSParameterAssert(fileName.length);
NSArray *paths = NSSearchPathForDirectoriesInDomains(
NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirPath = paths.firstObject;
NSString *filePath =
[documentsDirPath stringByAppendingPathComponent:fileName];
return filePath;
}
#endif
- (BOOL)hasJoinedRoomServerRoom {
return _clientId.length;
}
// Begins the peer connection connection process if we have both joined a room
// on the room server and tried to obtain a TURN server. Otherwise does nothing.
// A peer connection object will be created with a stream that contains local
// audio and video capture. If this client is the caller, an offer is created as
// well, otherwise the client will wait for an offer to arrive.
- (void)startSignalingIfReady {
if (!_isTurnComplete || !self.hasJoinedRoomServerRoom) {
return;
}
self.state = kARDAppClientStateConnected;
// Create peer connection.
RTCMediaConstraints *constraints = [self defaultPeerConnectionConstraints];
RTCConfiguration *config = [[RTCConfiguration alloc] init];
config.iceServers = _iceServers;
_peerConnection = [_factory peerConnectionWithConfiguration:config
constraints:constraints
delegate:self];
// Create AV senders.
[self createAudioSender];
[self createVideoSender];
if (_isInitiator) {
// Send offer.
__weak ARDAppClient *weakSelf = self;
[_peerConnection offerForConstraints:[self defaultOfferConstraints]
completionHandler:^(RTCSessionDescription *sdp,
NSError *error) {
ARDAppClient *strongSelf = weakSelf;
[strongSelf peerConnection:strongSelf.peerConnection
didCreateSessionDescription:sdp
error:error];
}];
} else {
// Check if we've received an offer.
[self drainMessageQueueIfReady];
}
#if defined(WEBRTC_IOS)
// Start event log.
if (kARDAppClientEnableRtcEventLog) {
NSString *filePath = [self documentsFilePathForFileName:@"webrtc-rtceventlog"];
if (![_peerConnection startRtcEventLogWithFilePath:filePath
maxSizeInBytes:kARDAppClientRtcEventLogMaxSizeInBytes]) {
RTCLogError(@"Failed to start event logging.");
}
}
// Start aecdump diagnostic recording.
if (_shouldMakeAecDump) {
NSString *filePath = [self documentsFilePathForFileName:@"webrtc-audio.aecdump"];
if (![_factory startAecDumpWithFilePath:filePath
maxSizeInBytes:kARDAppClientAecDumpMaxSizeInBytes]) {
RTCLogError(@"Failed to start aec dump.");
}
}
#endif
}
// Processes the messages that we've received from the room server and the
// signaling channel. The offer or answer message must be processed before other
// signaling messages, however they can arrive out of order. Hence, this method
// only processes pending messages if there is a peer connection object and
// if we have received either an offer or answer.
- (void)drainMessageQueueIfReady {
if (!_peerConnection || !_hasReceivedSdp) {
return;
}
for (ARDSignalingMessage *message in _messageQueue) {
[self processSignalingMessage:message];
}
[_messageQueue removeAllObjects];
}
// Processes the given signaling message based on its type.
- (void)processSignalingMessage:(ARDSignalingMessage *)message {
NSParameterAssert(_peerConnection ||
message.type == kARDSignalingMessageTypeBye);
switch (message.type) {
case kARDSignalingMessageTypeOffer:
case kARDSignalingMessageTypeAnswer: {
ARDSessionDescriptionMessage *sdpMessage =
(ARDSessionDescriptionMessage *)message;
RTCSessionDescription *description = sdpMessage.sessionDescription;
// Prefer H264 if available.
RTCSessionDescription *sdpPreferringH264 =
[ARDSDPUtils descriptionForDescription:description
preferredVideoCodec:@"H264"];
__weak ARDAppClient *weakSelf = self;
[_peerConnection setRemoteDescription:sdpPreferringH264
completionHandler:^(NSError *error) {
ARDAppClient *strongSelf = weakSelf;
[strongSelf peerConnection:strongSelf.peerConnection
didSetSessionDescriptionWithError:error];
}];
break;
}
case kARDSignalingMessageTypeCandidate: {
ARDICECandidateMessage *candidateMessage =
(ARDICECandidateMessage *)message;
[_peerConnection addIceCandidate:candidateMessage.candidate];
break;
}
case kARDSignalingMessageTypeCandidateRemoval: {
ARDICECandidateRemovalMessage *candidateMessage =
(ARDICECandidateRemovalMessage *)message;
[_peerConnection removeIceCandidates:candidateMessage.candidates];
break;
}
case kARDSignalingMessageTypeBye:
// Other client disconnected.
// TODO(tkchin): support waiting in room for next client. For now just
// disconnect.
[self disconnect];
break;
}
}
// Sends a signaling message to the other client. The caller will send messages
// through the room server, whereas the callee will send messages over the
// signaling channel.
- (void)sendSignalingMessage:(ARDSignalingMessage *)message {
if (_isInitiator) {
__weak ARDAppClient *weakSelf = self;
[_roomServerClient sendMessage:message
forRoomId:_roomId
clientId:_clientId
completionHandler:^(ARDMessageResponse *response,
NSError *error) {
ARDAppClient *strongSelf = weakSelf;
if (error) {
[strongSelf.delegate appClient:strongSelf didError:error];
return;
}
NSError *messageError =
[[strongSelf class] errorForMessageResultType:response.result];
if (messageError) {
[strongSelf.delegate appClient:strongSelf didError:messageError];
return;
}
}];
} else {
[_channel sendMessage:message];
}
}
- (RTCRtpSender *)createVideoSender {
RTCRtpSender *sender =
[_peerConnection senderWithKind:kRTCMediaStreamTrackKindVideo
streamId:kARDMediaStreamId];
RTCVideoTrack *track = [self createLocalVideoTrack];
if (track) {
sender.track = track;
[_delegate appClient:self didReceiveLocalVideoTrack:track];
}
return sender;
}
- (RTCRtpSender *)createAudioSender {
RTCMediaConstraints *constraints = [self defaultMediaAudioConstraints];
RTCAudioSource *source = [_factory audioSourceWithConstraints:constraints];
RTCAudioTrack *track = [_factory audioTrackWithSource:source
trackId:kARDAudioTrackId];
RTCRtpSender *sender =
[_peerConnection senderWithKind:kRTCMediaStreamTrackKindAudio
streamId:kARDMediaStreamId];
sender.track = track;
return sender;
}
- (RTCVideoTrack *)createLocalVideoTrack {
RTCVideoTrack* localVideoTrack = nil;
// The iOS simulator doesn't provide any sort of camera capture
// support or emulation (http://goo.gl/rHAnC1) so don't bother
// trying to open a local stream.
#if !TARGET_IPHONE_SIMULATOR
if (!_isAudioOnly) {
RTCMediaConstraints *mediaConstraints =
[self defaultMediaStreamConstraints];
RTCAVFoundationVideoSource *source =
[_factory avFoundationVideoSourceWithConstraints:mediaConstraints];
localVideoTrack =
[_factory videoTrackWithSource:source
trackId:kARDVideoTrackId];
}
#endif
return localVideoTrack;
}
#pragma mark - Collider methods
- (void)registerWithColliderIfReady {
if (!self.hasJoinedRoomServerRoom) {
return;
}
// Open WebSocket connection.
if (!_channel) {
_channel =
[[ARDWebSocketChannel alloc] initWithURL:_websocketURL
restURL:_websocketRestURL
delegate:self];
if (_isLoopback) {
_loopbackChannel =
[[ARDLoopbackWebSocketChannel alloc] initWithURL:_websocketURL
restURL:_websocketRestURL];
}
}
[_channel registerForRoomId:_roomId clientId:_clientId];
if (_isLoopback) {
[_loopbackChannel registerForRoomId:_roomId clientId:@"LOOPBACK_CLIENT_ID"];
}
}
#pragma mark - Defaults
- (RTCMediaConstraints *)defaultMediaAudioConstraints {
NSString *valueLevelControl = _shouldUseLevelControl ?
kRTCMediaConstraintsValueTrue : kRTCMediaConstraintsValueFalse;
NSDictionary *mandatoryConstraints = @{ kRTCMediaConstraintsLevelControl : valueLevelControl };
RTCMediaConstraints* constraints =
[[RTCMediaConstraints alloc] initWithMandatoryConstraints:mandatoryConstraints
optionalConstraints:nil];
return constraints;
}
- (RTCMediaConstraints *)defaultMediaStreamConstraints {
RTCMediaConstraints* constraints =
[[RTCMediaConstraints alloc]
initWithMandatoryConstraints:nil
optionalConstraints:nil];
return constraints;
}
- (RTCMediaConstraints *)defaultAnswerConstraints {
return [self defaultOfferConstraints];
}
- (RTCMediaConstraints *)defaultOfferConstraints {
NSDictionary *mandatoryConstraints = @{
@"OfferToReceiveAudio" : @"true",
@"OfferToReceiveVideo" : @"true"
};
RTCMediaConstraints* constraints =
[[RTCMediaConstraints alloc]
initWithMandatoryConstraints:mandatoryConstraints
optionalConstraints:nil];
return constraints;
}
- (RTCMediaConstraints *)defaultPeerConnectionConstraints {
if (_defaultPeerConnectionConstraints) {
return _defaultPeerConnectionConstraints;
}
NSString *value = _isLoopback ? @"false" : @"true";
NSDictionary *optionalConstraints = @{ @"DtlsSrtpKeyAgreement" : value };
RTCMediaConstraints* constraints =
[[RTCMediaConstraints alloc]
initWithMandatoryConstraints:nil
optionalConstraints:optionalConstraints];
return constraints;
}
- (RTCIceServer *)defaultSTUNServer {
return [[RTCIceServer alloc] initWithURLStrings:@[kARDDefaultSTUNServerUrl]
username:@""
credential:@""];
}
#pragma mark - Errors
+ (NSError *)errorForJoinResultType:(ARDJoinResultType)resultType {
NSError *error = nil;
switch (resultType) {
case kARDJoinResultTypeSuccess:
break;
case kARDJoinResultTypeUnknown: {
error = [[NSError alloc] initWithDomain:kARDAppClientErrorDomain
code:kARDAppClientErrorUnknown
userInfo:@{
NSLocalizedDescriptionKey: @"Unknown error.",
}];
break;
}
case kARDJoinResultTypeFull: {
error = [[NSError alloc] initWithDomain:kARDAppClientErrorDomain
code:kARDAppClientErrorRoomFull
userInfo:@{
NSLocalizedDescriptionKey: @"Room is full.",
}];
break;
}
}
return error;
}
+ (NSError *)errorForMessageResultType:(ARDMessageResultType)resultType {
NSError *error = nil;
switch (resultType) {
case kARDMessageResultTypeSuccess:
break;
case kARDMessageResultTypeUnknown:
error = [[NSError alloc] initWithDomain:kARDAppClientErrorDomain
code:kARDAppClientErrorUnknown
userInfo:@{
NSLocalizedDescriptionKey: @"Unknown error.",
}];
break;
case kARDMessageResultTypeInvalidClient:
error = [[NSError alloc] initWithDomain:kARDAppClientErrorDomain
code:kARDAppClientErrorInvalidClient
userInfo:@{
NSLocalizedDescriptionKey: @"Invalid client.",
}];
break;
case kARDMessageResultTypeInvalidRoom:
error = [[NSError alloc] initWithDomain:kARDAppClientErrorDomain
code:kARDAppClientErrorInvalidRoom
userInfo:@{
NSLocalizedDescriptionKey: @"Invalid room.",
}];
break;
}
return error;
}
@end