2.2.19. Audio Inputs

Feeds accepting a AudioInputFeedComponent argument during construction can accept audio input from a variety of sources:

providing the ability to capture and transmit audio from, respectively:

an audio device (e.g. a microphone)
a test signal generator
an output from another feed, via AudioOutputFeedInter

For example, to test audio through a speaker:

    PxMedia::AudioInputFeedTestSignal inputAudio;
    auto feed = PxMedia::PeerLocalAudioFeed::create(session, props, inputAudio, localOut);

    input_audio = media.AudioInputFeedTestSignal()
    feed = media.PeerLocalAudioFeed.create(session, props, input_audio, local_out)

To visualize audio sourced from the output of another feed:

    PxMedia::AudioInputFeedInter inputAudio = outputInter.makeInput();
    auto feed = PxMedia::PeerLocalAudioFeed::create(session, props, inputAudio, localOut);

    input_audio = output_inter.make_input()
    feed = media.PeerLocalAudioFeed.create(session, props, input_audio, local_out)

AudioInputFeedInter instances must be obtained via makeInput() before the associated output is passed to a feed create() call. Each instance can only be used in a single feed — violating either constraint is detected and surfaces as a PipelineElementBadProps error when the affected feed is created.