Linphone iOS callkit错误AVAudioSession

Question

我在为Voip Flutter应用程序实现linphone iOS本机时遇到了一个问题。当然，应用程序必须使用callkit来通知正在进行呼叫。当用户接听电话时，音频激活良好。但是，在那之后，我开始呼叫，但没有音频。我尝试了许多解决方案，但都不起作用(延迟开始呼叫，强制设置活动AVAudioSession...)但不走运，请帮我处理这个案子。谢谢!

测试的设备: iPad pro 2020 - iOS 14.1、iPhone 11 - iOS 14.1

2020-11-03 12:27:28:484 liblinphone-error-Failed in creating AVAudioPlayer: The operation couldn’t be completed. (OSStatus error 2003334207.)
Call incoming.

call coming objetc: 
Optional(linphonesw.Call)
2020-11-03 12:27:28.486837+0700 Runner[673:109546] flutter: call click in coming true
2020-11-03 12:27:28.486967+0700 Runner[673:109546] flutter: incoming true
accept call objetc: 
Optional(linphonesw.Call)
2020-11-03 12:27:28:487 ortp-warning-Fail to set IPv4 packet info on RTP socket: Invalid argument.
2020-11-03 12:27:28:487 ortp-warning-Fail to set IPv4 packet info on RTCP socket: Invalid argument.
We are connected !

2020-11-03 12:27:28:487 liblinphone-warning-Advanced adaptive rate control requested but avpf-tmmbr is not activated in this stream. Reverting to basic rate control instead
2020-11-03 12:27:28:487 ortp-warning-Fail to set IPv4 packet info on RTP socket: Invalid argument.
2020-11-03 12:27:28:487 ortp-warning-Fail to set IPv4 packet info on RTCP socket: Invalid argument.
2020-11-03 12:27:28:498 mediastreamer-error-Unable to activate audio session because : The operation couldn’t be completed. (OSStatus error 561017449.)
2020-11-03 12:27:28:570 mediastreamer-warning-MSAudio MSTicker: We are late of 59 miliseconds.
2020-11-03 12:27:28:643 mediastreamer-warning-MSAudio MSTicker: We are late of 62 miliseconds.
2020-11-03 12:27:28:709 mediastreamer-warning-MSAudio MSTicker: We are late of 58 miliseconds.
2020-11-03 12:27:28:786 mediastreamer-warning-MSAudio MSTicker: We are late of 56 miliseconds.
2020-11-03 12:27:28.813295+0700 Runner[673:109315] [aurioc] AURemoteIO.cpp:1095:Initialize: failed: 561017449 (enable 3, outf< 1 ch,  48000 Hz, Int16> inf< 1 ch,  48000 Hz, Int16>)
2020-11-03 12:27:28:813 mediastreamer-error-Cannot start audioUnit because [!pri]
2020-11-03 12:27:28:813 mediastreamer-error-AudioUnit error for AudioUnitInitialize(card->audio_unit): ret=unknown error (561017449) (/Users/belledonne/builds/2jexENcu/2/BC/public/linphone-sdk/mediastreamer2/src/audiofilters/msiounit.m:349)
2020-11-03 12:27:28.822813+0700 Runner[673:109315] [aurioc] AURemoteIO.cpp:1095:Initialize: failed: 561017449 (enable 3, outf< 1 ch,  48000 Hz, Int16> inf< 1 ch,  48000 Hz, Int16>)
2020-11-03 12:27:28:822 mediastreamer-error-Cannot start audioUnit because [!pri]
2020-11-03 12:27:28:822 mediastreamer-error-AudioUnit error for (auresult = AudioOutputUnitStart(card->audio_unit)): ret=unknown error (561017449) (/Users/belledonne/builds/2jexENcu/2/BC/public/linphone-sdk/mediastreamer2/src/audiofilters/msiounit.m:379)
2020-11-03 12:27:28.831621+0700 Runner[673:109315] [aurioc] AURemoteIO.cpp:1095:Initialize: failed: 561017449 (enable 3, outf< 1 ch,  48000 Hz, Int16> inf< 1 ch,  48000 Hz, Int16>)
2020-11-03 12:27:28:831 mediastreamer-error-Cannot start audioUnit because [!pri]
2020-11-03 12:27:28:831 mediastreamer-error-AudioUnit error for AudioUnitInitialize(card->audio_unit): ret=unknown error (561017449) (/Users/belledonne/builds/2jexENcu/2/BC/public/linphone-sdk/mediastreamer2/src/audiofilters/msiounit.m:349)
2020-11-03 12:27:28.839506+0700 Runner[673:109315] [aurioc] AURemoteIO.cpp:1095:Initialize: failed: 561017449 (enable 3, outf< 1 ch,  48000 Hz, Int16> inf< 1 ch,  48000 Hz, Int16>)
2020-11-03 12:27:28:839 mediastreamer-error-Cannot start audioUnit because [!pri]
2020-11-03 12:27:28:839 mediastreamer-error-AudioUnit error for (auresult = AudioOutputUnitStart(card->audio_unit)): ret=unknown error (561017449) (/Users/belledonne/builds/2jexENcu/2/BC/public/linphone-sdk/mediastreamer2/src/audiofilters/msiounit.m:379)

Answer 1

这通常是由于与Callkit的错误集成造成的。实际上，liblinphone和callkit操作必须根据特定的规则进行协调，以便iOS系统授予使用音频设备的权限。请参考liblinphone的相关文档：

https://wiki.linphone.org/xwiki/wiki/public/view/Lib/Getting%20started/iOS/#HCallKitintegration

诚挚的问候,

西蒙