Opus Interceptor

[MinnDevelopment]

Pull Request Etiquette

• I have checked the PRs for upcoming features/bug fixes.
• I have read the contributing guidelines.

Changes

• Internal code
• Library interface (affecting end-user code)
• Documentation
• Other: _____

Closes Issue: #418

Description

Provide a new receive handling for raw opus packets to lazy decode incoming packages.

Example

class Recorder : AudioSendHandler, AudioReceiveHandler {
    var playback = false
    private val queue = LinkedBlockingQueue<OpusPacket>()

    override fun isOpus() = true // we can just passthrough

    override fun canProvide() = playback && queue.isNotEmpty()

    override fun provide20MsAudio(): ByteBuffer {
        val opus = queue.poll().getOpusAudio() // no decoding needed
        return ByteBuffer.wrap(opus)
    }

    override fun canReceiveEncoded() = !playback

    override fun handleEncodedAudio(packet: OpusPacket) {
        queue += packet
    }

// ignored
    override fun canReceiveCombined() = false
    override fun canReceiveUser() = false

    override fun handleCombinedAudio(combinedAudio: CombinedAudio) {}
    override fun handleUserAudio(userAudio: UserAudio) {}
}

[MinnDevelopment]

Just as a reminder to myself: I haven't updated the AudioEchoExample to use opus because it needs combined audio which isn't supported when only listening for opus.