Linphone iOS callkit 錯誤 AVAudioSession

Question

為 Voip Flutter 應用程序實現 linphone iOS 本機時遇到問題。 當然，應用程序必須使用 callkit 來通知有來電。 當用戶接聽電話時，音頻活動良好。 但是，在那之后，我開始呼叫並且沒有聲音。 我嘗試了很多解決方案，但沒有奏效（延遲啟動呼叫，強制設置活動 AVAudioSession...）但沒有運氣，請幫我處理這種情況。 謝謝！

測試設備：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

這通常是由於與 Callkit 的錯誤集成造成的。 實際上，liblinphone 和 callkit 的操作必須按照一定的規則進行協調，以便 iOS 系統授予使用音頻設備的權限。 請參考 liblinphone 的相關文檔：

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

此致，

西蒙