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  2. Audio Stream Out CHOP

    Audio Stream Out CHOP

    Summary

    The Audio Stream Out CHOP can stream audio out to any rtsp client such as VideoLAN's VLC media player and Apple's Quicktime, or to a WebRTC peer.

    To access the stream in one of these players, open a "Network Stream" or "URL" under the File menu.


    Below is an example of a URL used to access the stream in a rtsp client.

    • IP Address = IP address of computer running TouchDesigner with the Audio Stream Out CHOP.
    • Port = number set in the Port parameter.
    • Stream Name = name given to stream in the Stream Name parameter.

    The URL required is rtsp://<IP address>:<Port>/<Stream Name>

    PythonIcon.pngaudiostreamoutCHOP_Class


    Parameters - Audio Stream Out Page

    Active active - Toggle's the rtsp server on or off.

    Mode mode - ⊞ - Select the stream out mode: either RTSP or WebRTC.
    • RTSP rtsp -
    • WebRTC webrtc -
    Port port - Port number used to transmit the audio stream. This number is needed in the URL supplied to the client receiving the stream. See example in Summary at top.

    Stream Name streamname - Name assigned to the stream. This stream name is needed in the URL supplied to the client receiving the stream. See example in Summary at top.


    Parameters - WebRTC Page

    WebRTC webrtc - Set the WebRTC DAT (ie. peer) to send the audio stream over. Setting this will automatically populate the WebRTC Connection parameter menu with available connections.

    WebRTC Connection webrtcconnection - Select the WebRTC peer-to-peer connection. Selecting this will automatically population the WebRTC Track parameter menu with available audio output tracks.

    WebRTC Track webrtctrack - Select the audio output track that's a part of the WebRTC peer-to-peer connection. The audio stream will be sent over this track.


    Parameters - Common Page

    Time Slice timeslice - Turning this on forces the channels to be "Time Sliced". A Time Slice is the time between the last cook frame and the current cook frame.

    Scope scope - To determine which channels get affected, some CHOPs use a Scope string on the Common page. See Pattern Matching.

    Sample Rate Match srselect - ⊞ - Handle cases where multiple input CHOPs' sample rates are different. When Resampling occurs, the curves are interpolated according to the Interpolation Method Option, or "Linear" if the Interpolate Options are not available.
    • Resample At First Input's Rate first - Use rate of first input to resample others.
    • Resample At Maximum Rate max - Resample to the highest sample rate.
    • Resample At Minimum Rate min - Resample to the lowest sample rate.
    • Error If Rates Differ err - Doesn't accept conflicting sample rates.
    Export Method exportmethod - ⊞ - This will determine how to connect the CHOP channel to the parameter. Refer to the Export article for more information.
    • DAT Table by Index datindex - Uses the docked DAT table and references the channel via the index of the channel in the CHOP.
    • DAT Table by Name datname - Uses the docked DAT table and references the channel via the name of the channel in the CHOP.
    • Channel Name is Path:Parameter autoname - The channel is the full destination of where to export to, such has geo1/transform1:tx.
    Export Root autoexportroot - This path points to the root node where all of the paths that exporting by Channel Name is Path:Parameter are relative to.

    Export Table exporttable - The DAT used to hold the export information when using the DAT Table Export Methods (See above).


    Operator Inputs

    • Input 0: -


    Info CHOP Channels

    Extra Information for the Audio Stream Out CHOP can be accessed via an Info CHOP.

    Specific Audio Stream Out CHOP Info Channels

    • packet_loss_ratio -

    Common CHOP Info Channels

    • start - Start of the CHOP interval in samples.
    • length - Number of samples in the CHOP.
    • sample_rate - The samplerate of the channels in frames per second.
    • num_channels - Number of channels in the CHOP.
    • time_slice - 1 if CHOP is Time Slice enabled, 0 otherwise.
    • export_sernum - A count of how often the export connections have been updated.

    Common Operator Info Channels

    • total_cooks - Number of times the operator has cooked since the process started.
    • cook_time - Duration of the last cook in milliseconds.
    • cook_frame - Frame number when this operator was last cooked relative to the component timeline.
    • cook_abs_frame - Frame number when this operator was last cooked relative to the absolute time.
    • cook_start_time - Time in milliseconds at which the operator started cooking in the frame it was cooked.
    • cook_end_time - Time in milliseconds at which the operator finished cooking in the frame it was cooked.
    • cooked_this_frame - 1 if operator was cooked this frame.
    • warnings - Number of warnings in this operator if any.
    • errors - Number of errors in this operator if any.


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