Play audio buffers generated by AVSpeechSynthesizer directly

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Play audio buffers generated by AVSpeechSynthesizer directly

Posted by - Latinos MediaSyndication -

on - May 1, 2023 -

Filed in - Technology -

311 Views - 0 Comments - 0 Likes - 0 Reviews

We have a requirement for audio processing on the output of AVSpeechSynthesizer. So we started with using the write method of AVSpeechSynthesizer class to apply processing on top. of it. What we currently have:

var synthesizer = AVSpeechSynthesizer()
var playerNode: AVAudioPlayerNode = AVAudioPlayerNode()
fun play(audioCue: String){
   let utterance = AVSpeechUtterance(string: audioCue)
   synthesizer.write(utterance, toBufferCallback: {[weak self] buffer in
      // We do our processing including conversion from pcmFormatFloat16 format to pcmFormatFloat32 format which is supported by AVAudioPlayerNode
      self.playerNode.scheduleBuffer(buffer as! AVAudioPCMBuffer, completionCallbackType: .dataPlayedBack)
   }
}

All of it was working fine before iOS 16 but with iOS 16 we started getting this exception:

[AXTTSCommon] TTSPlaybackEnqueueFullAudioQueueBuffer: error -66686 enqueueing buffer

Not sure what this exception means exactly. So we are looking for a way of addressing this exception or may be a better way of playing the buffers.

UPDATE:

Created an empty project for testing and it turns out the write method if called with an empty bloc generates these logs:

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Play audio buffers generated by AVSpeechSynthesizer directly

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