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VoIP(Voice over Internet Protocol)即首先数字化语音信号并压缩成帧,转换为IP数据包在网络上传输,以此完成语音通话的业务,是一种利用IP协议传输语音数据的通信技术,VoIP通话中媒体流是走的UDP,一旦网络质量不好,语音的质量就会有延时或者断续,但是速度快。
Linphone是一款基于标准SIP的开源VoIP电话工具,是一款遵循GPL的开源的网络电话系统。它能够让你通过internet来查询朋友的IP,并通过IP给他打电话的软件,功能非常强大,既支持桌面系统,也支持移动终端,还能支持WEB浏览器。使用linphone,我们可以在互联网上随意的通信,通过语音、视频、即时文本消息。
Linphone基于ilbc的编解码;ilbc的编解码压缩比率还是比较大的,大概在1/10至1/9之间。也就是说假如每秒20kb的语音数据,编码后就2kb/s,非常小,非常利于网络传输。它使用了一个C库speex, 来实现回声消除模块。Linphone的最大优势在于全平台支持,android,ios,winphone,windows,linux,mac osx,web 全都支持
Cocoapods 需要引入的开源三方库及版本:'linphone-sdk', ‘4.2’ 'CocoaAsyncSocket', '7.6.5'
linphone-sdk:用于实际的语音通话功能
CocoaAsyncSocket:用于与后台建立链接,分配网络座席和通话状态改变监听(开通多少个座席要注意,这会涉及到不菲的价格...)
因为不是我做的后台,我只能做简要的介绍,我们后台使用的语言是C++,如果不想付出太高的成本,又有比较高的效率, C++无疑是很好的选择。在语音通话过程中,客户端与后台会进行三大类型的交互:
1.向主管账号信息的服务器发送请求交互,获取与第二个服务器进行第二类和第三类交互要使用的数据模型
2.根据第一类与服务器交互获取的数据模型,LinPhoneSDK与服务器进行第二类交互,建立UDP链接,用于语音通话
3.根据第一类与后台交互获取的数据模型,使用客户端基于TCP/IP协议的socket网络库GCDAsyncSocket与后台进行第三类交互,建立链接,保持长链接,用于获取网络坐席和更改通话状态
1.登录
I. 向主管账号信息的服务器发送请求, 传入对应的URL,账号和密码,使用AES加密(key和偏移量与后台协商一致),获取接下来要使用的数据模型
- //向主管账号信息的服务器发送请求,建立链接,获取接下来要用到的数据模型
- YGCallManager *manager = [YGCallManager instance];
- [manager initSdk:model success:^(NSDictionary * _Nullable responseObject) {
- NSLog(@"initSdk:%@", responseObject);
- //与socket服务器和LinPhone服务器建立链接
- [[YGCallManager instance] login];
- } failure:^(NSError * _Nullable error) {
- NSLog(@"initSdk:%@", error);
- }];
II. LinPhoneSDK与服务器建立第二类交互,建立UDP连接,为语音通话服务
- ESSipManager *sipManager = [ESSipManager instance];
- [sipManager login:@"你的LoginNum" password:@"你的pwd" displayName:@"" domain:@"你的sipIP:sipPort" port:@"你的sipPort" withTransport:@"UDP"];
III. 当Linphone登录成功,会调用成功的回调,这时socket与服务器建立第三类链接,为开通网络坐席和切换通话状态服务
- sipManager.linphoneBlock = ^(NSInteger registrationState) {
- if (self.linphoneRegistrationState != registrationState) {
- self.linphoneRegistrationState = registrationState;
- if (registrationState == 2) {
- //2.socket连接
- self.clientSocket = [[GCDAsyncSocket alloc] initWithDelegate:self delegateQueue:dispatch_get_main_queue()];
- NSError *socketError = nil;
- if (![self.clientSocket connectToHost:self.tcpModel.TransferIP onPort:self.tcpModel.TransferPort withTimeout:-1 error:&socketError]) {
- if (socketError) {
- NSLog(@"连接服务器失败:%@", socketError.localizedDescription);
- return;
- }
- }
这里说的切换通话状态服务,也就是说接通和挂断等需要让客户端知道,以做到相应的处理,客户端接受状态的变化主要是通过socket的代理来实现
主要功能代码:
- - (void)socket:(GCDAsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag {
- //接收登录服务消息
- if ([lastString containsString:@"LOGIN_SUCCEED"]) {
- //向app端推送EventLogin成功消息
- if (self.eventBlock) {
- NSDictionary *dic = @{@"msg":@"登录成功"};
- self.eventBlock(EVENTLogin, YES, dic);
- }
- //通知服务器当前账号的通道已经被占用
- NSData *data4 = [self sendMsgWithName:@"" type:@"" targetType:@"" msg:[NSString stringWithFormat:@"与后台协商好的信令服务"]];
- [self.clientSocket writeData:data4 withTimeout:-1 tag:4];
- }
- }
IV. 做登录功能遇到的问题: 在一开始实现登录的时候发现多次登录会经常报用户正忙,无法登录。后来与后台联调,发现单点登录功能(也就是这次登录会把之前的登录踢下去)还不完善,针对socket接口进行了优化升级.流程修改为: 发送准备状态给语音通话的服务器 => 发送初始化消息给分配座席服务器 => 发送清理通道消息给服务器 =》 发送登录消息给服务器
实现功能的部分代码(主要是发送与后台协商好的socket):
- //登录
- - (void)ygTcpLogin {
- //发送准备状态给服务器
- NSData *data = [self sendMsgWithName:@"" type:@"" targetType:@"" msg:@"与后台约定好的信令服务"];
- [self.clientSocket writeData:data withTimeout:-1 tag:0];
- //发送初始化消息给转发服务器
- NSData *data1 = [self sendMsgWithName:@"" type:@"" targetType:@"" msg:@"与后台约定好的信令服务"];
- [self.clientSocket writeData:data1 withTimeout:-1 tag:1];
- //发送清理通道消息给服务器
- NSData *data2 = [self sendMsgWithName:@"" type:@"" targetType:@"" msg:@"与后台约定好的信令服务"];
- [self.clientSocket writeData:data2 withTimeout:-1 tag:2];
- //发送登录消息给服务器
- NSData *data3 = [self sendMsgWithName:@"" type:@"" targetType:@"" msg:@"与后台约定好的信令服务"];
- [self.clientSocket writeData:data3 withTimeout:-1 tag:3];
- }
V. 做登陆功能遇到的问题2: iOS16以上的版本Linphone与语音通话后台无法建立链接,原因是端口存在被占用的可能。解决方式是每次链接时,给LinPhone分配未被占用的随机端口
实现的功能的部分代码:
- [LinphoneManager.instance resetLinphoneCore];
-
- LinphoneProxyConfig *config = linphone_core_create_proxy_config(LC);
- LinphoneAddress *addr = linphone_address_new([NSString stringWithFormat:@"sip:%@@%@",username, domain].UTF8String);
- LinphoneAddress *tmpAddr = linphone_address_new([NSString stringWithFormat:@"sip:%@",domain].UTF8String);
- linphone_address_set_username(addr, username.UTF8String);
- linphone_address_set_port(addr, linphone_address_get_port(tmpAddr));
- linphone_address_set_domain(addr, linphone_address_get_domain(tmpAddr));
- if (displayName && ![displayName isEqualToString:@""]) {
- linphone_address_set_display_name(addr, displayName.UTF8String);
- }
- linphone_proxy_config_set_identity_address(config, addr);
- if (transport) {
- linphone_proxy_config_set_route(
- config,
- [NSString stringWithFormat:@"%s;transport=%s", domain.UTF8String, transport.lowercaseString.UTF8String]
- .UTF8String);
- linphone_proxy_config_set_server_addr(
- config,
- [NSString stringWithFormat:@"%s;transport=%s", domain.UTF8String, transport.lowercaseString.UTF8String]
- .UTF8String);
- }
-
- linphone_proxy_config_enable_publish(config, FALSE);
- linphone_proxy_config_enable_register(config, TRUE);
-
- LinphoneAuthInfo *info =
- linphone_auth_info_new(linphone_address_get_username(addr), // username
- NULL, // user id
- password.UTF8String, // passwd
- NULL, // ha1
- linphone_address_get_domain(addr), // realm - assumed to be domain
- linphone_address_get_domain(addr) // domain
- );
- linphone_core_add_auth_info(LC, info);
- linphone_address_unref(addr);
- linphone_address_unref(tmpAddr);
- //分配随机端口
- LCSipTransports transportValue = {-1,-1,-1,-1};
-
- if (linphone_core_set_sip_transports(LC, &transportValue)) {
- NSLog(@"cannot set transport");
- }
2.外呼
I. 外呼功能流程:客户端拨打 => 通知服务器将当前账号置于繁忙状态并分配座席 => 客户端收到转座席是否成功的socket回调并做相应的处理, 同时服务器(语音后台)发送虚拟号码和被呼叫的号码等相关信息给Lin Phone,通知Linphone拨打网络电话
实现外呼功能的部分代码(客户端主要是把自己和被呼叫者的信息发给后台,LinPhone拨打电话实际是由后台触发的):
- //当前账号置为繁忙
- NSData *data8 = [self sendMsgWithName:@"" type:@"" targetType:@"" msg:@"繁忙信令"];
- [self.clientSocket writeData:data8 withTimeout:-1 tag:8];
-
- //分配座席,并建立语音通话链接
- NSData *data9 = [self sendMsgWithName:@"" type:@"" targetType:@"" msg:@"座席建立链接信令"];
- [self.clientSocket writeData:data9 withTimeout:-1 tag:9];
II.外呼动作完成后,就需要等待被呼叫者,看其是否接听,这就需要监听通话状态的改变,这里是由LinPhone提供的状态变化的宏来实现的,我们需要对这个后果进行通知监听,一旦监听到状态变化,调用LinPhone相关的API来进行接听或挂断。
实现功能的部分代码:
- //监听通话状态变化
- [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(onCallUpdate:) name:kLinphoneCallUpdate object:nil];
-
- - (void) onCallUpdate: (NSNotification*) notification {
- NSDictionary* userInfo = [notification userInfo];
- NSValue* c = [userInfo valueForKey:@"call"];
- // int state = (int)[userInfo valueForKey:@"state"];
- LinphoneCallState state = [[userInfo objectForKey:@"state"] intValue];
- NSString* message = [userInfo valueForKey:@"message"];
- NSLog(@"========== state: %d, message: %@", state, message);
- LinphoneCall* call = c.pointerValue;
-
- NSDictionary *dict = @{@"call" : [NSValue valueWithPointer:call],
- @"state" : [NSNumber numberWithInt:state],
- @"message" : message};
-
- switch (state) {
- //接听
- case LinphoneCallIncomingReceived: {
- [NSNotificationCenter.defaultCenter postNotificationName:ES_ON_CALL_COMMING object: self userInfo:dict];
- if (self.callBlock) {
- self.callBlock((NSInteger)state, dict);
- }
- break;
- }
- case LinphoneCallOutgoingInit:
- case LinphoneCallConnected:
- case LinphoneCallStreamsRunning: {
- // check video
- if (![self isVideoEnabled:call]) {
- const LinphoneCallParams *param = linphone_call_get_current_params(call);
- const LinphoneCallAppData *callAppData =
- (__bridge const LinphoneCallAppData *)(linphone_call_get_user_data(call));
- if (state == LinphoneCallStreamsRunning && callAppData->videoRequested &&
- linphone_call_params_low_bandwidth_enabled(param)) {
- // too bad video was not enabled because low bandwidth
-
- NSLog(@"带宽太低,无法开启视频通话");
-
- callAppData->videoRequested = FALSE; /*reset field*/
- }
- }
- [NSNotificationCenter.defaultCenter postNotificationName:ES_ON_CALL_STREAM_UPDATE object:self userInfo:dict];
- break;
- }
- case LinphoneCallUpdatedByRemote: {
- const LinphoneCallParams *current = linphone_call_get_current_params(call);
- const LinphoneCallParams *remote = linphone_call_get_remote_params(call);
-
- /* remote wants to add video */
- if ((linphone_core_video_display_enabled([LinphoneManager getLc]) && !linphone_call_params_video_enabled(current) &&
- linphone_call_params_video_enabled(remote)) &&
- (!linphone_core_get_video_policy([LinphoneManager getLc])->automatically_accept ||
- (([UIApplication sharedApplication].applicationState != UIApplicationStateActive) &&
- floor(NSFoundationVersionNumber) > NSFoundationVersionNumber_iOS_9_x_Max))) {
- linphone_core_defer_call_update([LinphoneManager getLc], call);
-
-
- [NSNotificationCenter.defaultCenter postNotificationName:ES_ON_REMOTE_OPEN_CEMERA object: self userInfo:dict];
-
- // [self allowToOpenCameraByRemote:call];
-
- } else if (linphone_call_params_video_enabled(current) && !linphone_call_params_video_enabled(remote)) {
-
- }
- break;
- }
- case LinphoneCallUpdating:
- break;
- case LinphoneCallPausing:
- case LinphoneCallPaused:
- break;
- case LinphoneCallPausedByRemote:
- break;
- //挂断
- case LinphoneCallEnd: {//LinphoneCallEnd
- [NSNotificationCenter.defaultCenter postNotificationName:ES_ON_CALL_END object: self userInfo:NULL];
- if (self.callBlock) {
- self.callBlock((NSInteger)state, dict);
- }
- break;
- }
- case LinphoneCallReleased: {
- if (self.callBlock) {
- self.callBlock((NSInteger)state, dict);
- }
- break;
- }
- case LinphoneCallError:
- default:
- break;
- }
- }
当触发callBlock后,就会调用LinPhone相应的接听的方法:
- - (void)acceptCall:(LinphoneCall *)call evenWithVideo:(BOOL)video {
- LinphoneCallParams *lcallParams = linphone_core_create_call_params(theLinphoneCore, call);
- if (!lcallParams) {
- LOGW(@"Could not create call parameters for %p, call has probably already ended.", call);
- return;
- }
-
- if ([self lpConfigBoolForKey:@"edge_opt_preference"]) {
- bool low_bandwidth = self.network == network_2g;
- if (low_bandwidth) {
- LOGI(@"Low bandwidth mode");
- }
- linphone_call_params_enable_low_bandwidth(lcallParams, low_bandwidth);
- }
- linphone_call_params_enable_video(lcallParams, video);
-
- linphone_call_accept_with_params(call, lcallParams);
- linphone_call_params_unref(lcallParams);
- }
此时,一个呼叫-接听的流程就已经建立,接下来就要说到挂断了,因为有接听,必然就有挂断
3.挂断
挂断分为两类,一类是己方主动挂断,另一类是对方挂断,这是两种不同的处理方式
I. 己方挂断
流程: 己方点击挂断 => 通知后台己方挂断,即将执行挂断流程 => 通知LinPhone执行挂断 => LinPhone执行挂断后通知语音服务器执行挂断处理 => 语音服务器通知与socket进行长链接的服务器进行挂断处理 => 与socket进行长链接的服务器会给客户端回调,设置完全通话结束socket信令给socket服务器,并设置己方处于空闲状态 => 语音服务器会给Linphone发送通话完全结束,Linphone清理本次通话数据并通知客户端,进行本地通话数据清理
开始通知后台执行己方挂断,并且通知Linphone结束通话的部分代码:
- NSData *data20 = [self sendMsgWithName:self.tcpModel.PhoneNo type:@"" targetType:@"" msg:[NSString stringWithFormat:@"开始结束通话信令服务"];
-
- LinphoneCore* lc = [LinphoneManager getLc];
- LinphoneCall* currentcall = linphone_core_get_current_call(lc);
- if (linphone_core_is_in_conference(lc) || // In conference
- (linphone_core_get_conference_size(lc) > 0) // Only one conf
- ) {
- linphone_core_terminate_conference(lc);
- } else if(currentcall != NULL) { // In a call
- // linphone_core_terminate_call(lc, currentcall);
- linphone_call_terminate(currentcall);
- } else {
- const MSList* calls = linphone_core_get_calls(lc);
- if (ms_list_size(calls) == 1) { // Only one call
- // linphone_core_terminate_call(lc,(LinphoneCall*)(calls->data));
- linphone_call_terminate((LinphoneCall *)(calls->data));
- }
- }
后台收到结束通话信令,并且通知客户端传送结束的socket信息,客户端向后台发送己方置为空闲的部分代码:
- //设置话后
- NSData *data11 = [self sendMsgWithName:@"" type:@"" targetType:@"FlyCcs" msg:[NSString stringWithFormat:@"话后信令"]];
- [self.clientSocket writeData:data11 withTimeout:-1 tag:11];
- //设置话后提交
- NSData *data12 = [self sendMsgWithName:@"" type:@"" targetType:@"FlyCcs" msg:[NSString stringWithFormat:@"话后提交信令"]];
- [self.clientSocket writeData:data12 withTimeout:-1 tag:12];
- //空闲
- NSData *data19 = [self sendMsgWithName:self.tcpModel.PhoneNo type:@"FlyCcs" targetType:@"FlyCcs" msg:[NSString stringWithFormat:@"空闲信令"]];
- [self.clientSocket writeData:data19 withTimeout:-1 tag:19];
LinPhone发送彻底消除通话的通知,客户端执行本地通话的数据清理的部分代码:
- case LinphoneCallReleased: {
- if (self.callBlock) {
- self.callBlock((NSInteger)state, dict);
- }
- break;
- }
-
-
- sipManager.callBlock = ^(NSInteger callState, NSDictionary *dict) {
- if (self->_ISDIALOUT == 0) {
- return;
- }
- if (callState == 1) {
- NSLog(@"接听--callState == 1");
- LinphoneCall *call = [dict[@"call"] pointerValue];
- [weakManager acceptCall:(ESCall *)call];
- } else if (callState == 18) {
- NSLog(@"挂断--callState == 18");
- //向app端推送EventHangup
- // if (self.eventBlock) {
- // NSDictionary *dic = @{@"CallId":@"",
- // @"CallTime":@"",
- // @"CodeCause":@"",
- // @"ConnectTime":@"",
- // @"EndTime":@"",
- // @"Rebark":self.Rebark ? self.Rebark : @"",
- // @"SignalIng":@"",
- // @"WavFile":self.WavFile ? self.WavFile : @""
- // };
- // self.eventBlock(EVENTHangup, YES, dic);
- // }
- //清空本地数据
- self->_callModel = nil;
- self->_CallId = nil;
- self->_ConnectTime = nil;
- self->_Rebark = nil;
- self->_WavFile = nil;
- self->_ISDIALOUT = 10;
- }
II. 对方挂断
流程;对方挂断 => LinPhone通知客户端挂断 => LinPhone通知服务器通话挂断 => 服务器通知客户端发动结束通话,置为空闲的信令 => 服务器通知LinPhone消除本次通话数据 => LinPhone通知客户端消除本次通话数据
实现功能的关键代码与己方挂断代码是相同的,所以就不列举了
4.来电
流程: LinPhone收到来电通知 => 通知服务器和客户端回调收到来电 => 服务器通过socket代理通知客户端来电和相关来电消息 => 客户端发送繁忙信令和转发分配座席信令 =>通话信道建立完毕
实现功能的部分代码(与上面重复的部分省略):
-
- //繁忙信令
- NSData *data13 = [self sendMsgWithName:@"" type:@"" targetType:@"" msg:[NSString stringWithFormat:@"当前账号置为繁忙的信令"]]; //与data10一样;
- [self.clientSocket writeData:data13 withTimeout:-1 tag:13];
-
- //分配座席信令
- NSData *data14 = [self sendMsgWithName:@"" type:@"" targetType:@"FlyCn" msg:[NSString stringWithFormat:@"转发分配座席的信令"]; //与data10一样
- [self.clientSocket writeData:data14 withTimeout:-1 tag:14];
4.接听
实现主要功能的部分代码:
- LinphoneCallParams *lcallParams = linphone_core_create_call_params(theLinphoneCore, call);
- if (!lcallParams) {
- LOGW(@"Could not create call parameters for %p, call has probably already ended.", call);
- return;
- }
-
- if ([self lpConfigBoolForKey:@"edge_opt_preference"]) {
- bool low_bandwidth = self.network == network_2g;
- if (low_bandwidth) {
- LOGI(@"Low bandwidth mode");
- }
- linphone_call_params_enable_low_bandwidth(lcallParams, low_bandwidth);
- }
- linphone_call_params_enable_video(lcallParams, video);
-
- linphone_call_accept_with_params(call, lcallParams);
- linphone_call_params_unref(lcallParams);
还有就是一些比较细小的功能,比如听筒/扬声器切换,静音切换
- //听筒/扬声器切换
- - (void)speakerToggle {
- //true:开启扬声器; false:关闭扬声器
- [LinphoneManager.instance setSpeakerEnabled:self->speaker];
- self->speaker = !self->speaker;
- }
-
- //静音切换
- - (void)muteToggle {
- //true:开启静音; false:关闭静音
- linphone_core_enable_mic(LC, self->mute);
- self->mute = !self->mute;
- }
还有就是先忙其他事,保持当前通话,对方听不到声音:
流程:客户端向服务器发送保持当前通话信令 => 客户端向服务器发送保持繁忙状态信令 => 语音服务区通知LinPhone进入保持当前通话状态
- //保持
- - (void)holdCall {
- NSData *data30 = [self sendMsgWithName:@"" type:@"" targetType:@"" msg:[NSString stringWithFormat:@"保持通话信令"];
- [self.clientSocket writeData:data30 withTimeout:-1 tag:30];
-
- NSData *data31 = [self sendMsgWithName:@"" type:@"" targetType:@"" msg:[NSString stringWithFormat:@"保持繁忙状态信令"];
- [self.clientSocket writeData:data31 withTimeout:-1 tag:31];
-
- //向app端推送状态事件EventAgentState
- if (self.eventBlock) {
-
- }
-
- self.flag = ([self.flag isEqualToString:@"HOLDCALL"]) ? @"REHOLDCALL" : @"HOLDCALL";
- }
通话过程中的保活已经由LinPhone底层实现,但是没有通话还处于后台模式,怎么保活来保证收到来电和播放响铃呢,这里的响铃不是微信里的通知短暂响铃,而是长时间的响铃,我这边的实现方式主要是基于播放无声音乐
I. LinPhone给客户端状态回调,通知来电,在来电的回调里调用播放长时间响铃 ,挂断电话时,在回调里通知挂断,然后结束播放铃声
- manager.eventBlock = ^(EVENT event, BOOL result, NSDictionary * _Nonnull resultMsg) {
- switch (event) {
- case EVENTAgentState: {
- //状态变化事件,下一行注释均为回调具体参数
- [[NSNotificationCenter defaultCenter] postNotificationName:kEVENTAgentState object:nil userInfo:resultMsg];
- }
- break;
- case EVENTLogin: {
- //登录成功事件
- if (result) {
- ViewController *vc = [[ViewController alloc] init];
- [self.navigationController pushViewController:vc animated:YES];
- } else {
- sender.enabled = YES;
- [self alertWithMessage:@"登录失败,请重新登录"];
- }
- }
- break;
- case EVENTQuitLogin: {
- //退出登录或工号异处登录事件
- [[NSNotificationCenter defaultCenter] postNotificationName:kEVENTQuitLogin object:nil userInfo:resultMsg];
- }
- break;
- case EVENTMakeCall: {
- //外呼事件
- }
- break;
- case EVENTComeCall: {
- //来电事件
- [[NSNotificationCenter defaultCenter] postNotificationName:kComeCallUpdate object:nil userInfo:resultMsg];
- AVAudioSession *audioSession = [AVAudioSession sharedInstance];
- // 设置多声道播放
- NSError *error = nil;
- [audioSession setCategory:AVAudioSessionCategoryMultiRoute withOptions:AVAudioSessionCategoryOptionMixWithOthers error:&error];
- [[ZSAVPlayerInstance sharedInstance] start];
- }
- break;
- case EVENTCalling: {
- //通话中事件
- [[ZSAVPlayerInstance sharedInstance] stop];
- AVAudioSession *audioSession = [AVAudioSession sharedInstance];
- // 设置后台播放
- NSError *error = nil;
- [audioSession setCategory:AVAudioSessionCategoryPlayAndRecord withOptions:AVAudioSessionCategoryOptionMixWithOthers error:&error];
- }
- break;
- case EVENTHangup: {
- //挂机事件
- [[NSNotificationCenter defaultCenter] postNotificationName:kEVENTHangup object:nil userInfo:resultMsg];
- [[ZSAVPlayerInstance sharedInstance] stop];
- AVAudioSession *audioSession = [AVAudioSession sharedInstance];
- // 设置后台播放
- NSError *error = nil;
- [audioSession setCategory:AVAudioSessionCategoryPlayback withOptions:AVAudioSessionCategoryOptionMixWithOthers error:&error];
- }
- break;
- default:
- break;
- }
- [resultMsg enumerateKeysAndObjectsUsingBlock:^(id key,id obj, BOOL *stop) {
- NSLog(@"event:%d key:%@ value:%@", (int)event, key, obj);
- }];
- };
II.问题:
在这个过程中,遇到的问题是后台保活音乐和铃声播放存在冲突,后台保活音乐要设置AVAudioSession为AVAudioSessionCategoryPlayback后台播放模式,铃声在这种模式下无法播放,播放铃声要设置为AVAudioSessionCategoryMultiRoute多声道模式, 等到接听铃声播放结束再设置为AVAudioSessionCategoryPlayback后台播放模式,
播放器部分代码:
- static ZSAVPlayerInstance *instance;
- static dispatch_once_t onceToken;
- + (instancetype)sharedInstance {
- dispatch_once(&onceToken, ^{
- instance = [ZSAVPlayerInstance new];
- });
- return instance;
- }
-
-
- - (void)setup {
- [self setupAudioSession];
- [self setupAudioPlayer];
- }
-
- - (void)setupAudioSession {
- // 新建AudioSession会话
- AVAudioSession *audioSession = [AVAudioSession sharedInstance];
- // 设置多声道混合播放
- NSError *error = nil;
- [audioSession setCategory:AVAudioSessionCategoryMultiRoute withOptions:AVAudioSessionCategoryOptionMixWithOthers error:&error];
- if (error) {
- NSLog(@"Error setCategory AVAudioSession: %@", error);
- }
- NSLog(@"%d", audioSession.isOtherAudioPlaying);
- NSError *activeSetError = nil;
- // 启动AudioSession,如果一个前台app正在播放音频则可能会启动失败
- [audioSession setActive:YES error:&activeSetError];
- if (activeSetError) {
- NSLog(@"Error activating AVAudioSession: %@", activeSetError);
- }
- }
-
- - (void)setupAudioPlayer {
- //铃声文件
- self.audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:[[NSBundle mainBundle] URLForResource:@"notes_of_the_optimistic" withExtension:@"caf"] error:nil];
- //音量
- self.audioPlayer.volume = 1.0;
- //播放多次
- self.audioPlayer.numberOfLoops = -1;
- [self.audioPlayer prepareToPlay];
- }
-
- #pragma mark - public method
-
- - (void)start {
- NSLog(@"--ringUrl:%@", self.ringUrl.absoluteString);
- [self setupAudioSession];
- [self setupAudioPlayer];
- if (!self.audioPlayer.isPlaying) {
- [self.audioPlayer play];
- }
- }
-
- - (void)stop {
- [self.audioPlayer stop];
- }
语音通话的主要知识点就是这些,还有一些其他的就需要结合具体业务流程就不方便说了,视频通话也可以使用LinPhone,有时间再写吧,感觉有帮助的话给个star吧!
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