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Apple Developer Documentation

    https://developer.apple.com/documentation/audiotoolbox/kaudiosessioncategory_playandrecord
    kAudioSessionCategory_PlayAndRecord | Apple Developer Documentation Global Variable k Audio Session Category _Play And Record Allows recording (input) and playback (output) of audio, such as for a VOIP (voice over IP) app. Declaration var kAudioSessionCategory_PlayAndRecord: Int { get } Discussion

Apple Developer Documentation

    https://developer.apple.com/documentation/audiotoolbox/1618427-audio_session_categories/kaudiosessioncategory_playandrecord
    kAudioSessionCategory_PlayAndRecord = 'plar' Discussion. Your audio continues with the Silent switch set to silent and with the screen locked. (The switch is called the Ring/Silent switch on iPhone.) This category is appropriate for simultaneous recording and playback, and also for apps that record and play back but not simultaneously.

setting audio session property to kAudioSessionCategory ...

    https://stackoverflow.com/questions/1336553/setting-audio-session-property-to-kaudiosessioncategory-playandrecord-why-i-m-no
    i m setting session with kAudioSessionCategory_PlayAndRecord property but still i m not able to play both ipod music as well as recording???? how …

Apple Developer Documentation

    https://developer.apple.com/documentation/audiotoolbox/audio_session_support
    Audio Session Services lets you specify the intended audio behavior for your iOS app. For example, you can specify whether you intend for your app’s audio to silence other apps or to mix with their audio. You also use this API to specify your app’s behavior when it is interrupted, such as by a phone call.

UInt32 sessionCategory = kAudioSessionCategory ...

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How to do realtime recording with effect processing on iOS

    http://teragonaudio.com/article/How-to-do-realtime-recording-with-effect-processing-on-iOS.html
    int initAudioStreams(AudioUnit *audioUnit) { UInt32 audioCategory = kAudioSessionCategory_PlayAndRecord; if(AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof(UInt32), &audioCategory) != noErr) { return 1; } UInt32 overrideCategory = 1; …

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