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self.synthesizer.write(utterance) { buffer in DispatchQueue.main.async { guard let pcmBuffer = buffer as? AVAudioPCMBuffer, pcmBuffer.frameLength > 0 else { return } // Need to convert the buffer to different format because AVAudioEngine does not support the format returned from AVSpeechSynthesizer guard self.converter != nil, let pcmFormat = AVAudioFormat(commonFormat: AVAudioCommonFormat.pcmFormatFloat32, sampleRate: pcmBuffer.format.sampleRate, channels: pcmBuffer.format.channelCount, interleaved: false), let convertedBuffer = AVAudioPCMBuffer(pcmFormat: pcmFormat, frameCapacity: pcmBuffer.frameCapacity) else { return } do { try self.converter?.convert(to: convertedBuffer, from: pcmBuffer) self.bufferCounter += 1 self.scheduleNextBuffer(convertedBuffer) self.converter?.reset() } catch { self.handleTextToSpeechError() } } }

1. I have an unknown bug-free iOS project.2. I want to add a new feature.3. Need to set up minimal dependancy to the actual project source.4. The feature should be reusable to another project.5. Will be safe switching between multiple modules.