Audio Device Out CHOP
The Audio Device Out CHOP sends audio to any of the attached audio output devices using DirectSound or ASIO. The audio channels can be routed to any speaker location. See Outputs section below.
The second input on the Audio Device Out CHOP can be used for volume control.
Tip: If you get audio popping or audio dropouts, it may be caused by your actual frame rate of your main
timeline - some frames may take too long to compute/render. See Time Slicing. There are four possible remedies:
- The global CHOP Maximum Time Slice Size may be shorter than your worst-case time steps. Its default is .2 seconds set in Edit -> Preferences -> CHOPs -> Maximum Time Slice Size). If any frame takes longer than the Maximum Time Slice Size time to draw, audio will pop.
- Then the audio buffer size can be increased (the Buffer Length parameter defaults to .15 seconds) up to the Maximum Time Slice Size.
- Optimize your networks so under no condition your frame time exceeds the audio buffer size or the maximum time slice size. You can monitor this precisely with the Perform CHOP.
- Put audio in a separate TouchDesigner process.
Parameters - Audio Device Out Page
active - Turns the audio output on or off.
driver - ⊞ - Select between DirectSound and ASIO drivers.
directsound- The default Windows audio driver (a.k.a. WDM).
asio- Low-latency drivers which usually come from the hardware's manufacturer.
device - A menu of available audio devices to output to. Selecting default sets the audio device to that which is selected in Windows Control Panel>Sounds and Audio Devices>Audio>Sound Playback.
outputs - When Driver is set to ASIO, this parameter lets you pick which output channels to use.
bufferlength - The length of the audio buffer in seconds. Audio output is delayed by this amount. For example, if the Buffer Length is 0.25 then the sound will occur 250ms = 0.25 seconds later than this CHOP received it (to keep the buffer full). If you hear crackling or popping in the audio output, try increasing this value.
volume - 0 = mute, 1 = full volume.
pan - 0 = left, 0.5 = centered, 1 = right.
clampoutput - Clamps the output between -1 and 1 to avoid clipping and overdriving of the audio system.
Cook Every Frame
cookalways - Forces the CHOP to cook every frame. This should be checked on at all times when outputing audio. It can be turned off when the CHOP is not in use.
Parameters - Output 1 Page
The outputs on this page and the following Output 2 page are for routing to an audio device's different speaker outputs. Not all devices will support all outputs.
When the Audio Device Out CHOP has multiple input channels, the channels are applied to the checked speaker outputs in order. The first input channel is output to the first speaker checked, the second input channel is output to the second speaker checked, and so on.
The following speaker outputs are found on this parameter page:
Front Left of Center
Front Right of Center
Parameters - Output 2 Page
The following speaker outputs are found on this parameter page:
Top Front Left
Top Front Center
Top Front Right
Top Back Left
Top Back Center
Top Back Right
Parameters - Common Page
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 - To determine which channels get affected, some CHOPs use a Scope string on the Common page.
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.
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
autoexportroot - This path points to the root node where all of the paths that exporting by Channel Name is Path:Parameter are relative to.
exporttable - The DAT used to hold the export information when using the DAT Table Export Methods (See above).
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A Time Slice is the time between the last cook frame and the current cook frame. In CHOPs it is a set of short channels that only contain the CHOP channels' samples between the last and the current cook frame.
A custom interactive control panel built within TouchDesigner. Panels are created using Panel Components whose look is created entirely with TOPs.
To re-compute the output data of the Operators. An operator cooks when (1) its inputs change, (2) its Parameters change, (3) when the timeline moves forward in some cases, or (4) Scripting commands are run on the node. When the operator is a Gadget, it also cooks when a user interacts with it. When an operator cooks, it usually causes operators connected to its output to re-cook. When TouchDesigner draws the screen, it re-cooks all the necessary operators in all Networks, contributing to a frame's total "cook time".
The term "Frame" is used (1) in the Timeline, (2) as a time-unit in CHOPs, (3) as a time-unit in TOPs, and (4) with movies images which are read and created with TOPs.
A parameter in most CHOPs that restricts which channels of that CHOP will be affected. Normally all channels of a CHOP are affected by the operator.
samples-per-second of a CHOP. Each CHOP in your network has a sample rate, whether it is used or not. The overall timeline has a "frame rate", which is the number of animation frames per second, generally your monitor display frequency.
Exporting is the connection of CHOP channels to parameters of operators. The output of each exporting CHOP is one or more channels, active only while the CHOP Viewer is on. The current value of a channel can be exported to a parameter of any operator, overriding that parameter's value. See Parameter.
Parameters in TouchDesigner are an operator's settings (numbers, menus, flags, strings, paths) which the user can alter. Parameters for any operator can be opened by right-clicking on the operator and selecting "Parameters..." A currently selected operator's parameters can be viewed in a Network Editor by pressing the keyboard shortcut 'p'.