AUDIO Extension
for the X Window System
Contents

Not yet complete, but covers majority of functions useful for audio applications.

Initialization

Before making use of any of these extensions, client applications should check that they are present on the server:

Clocks

Schedulers

  • XtimeCreateScheduler: Create a server-side scheduler; a scheduler is bound to a clock and allows deferred execution of X requests
  • XtimeFreeScheduler: Free a server-side scheduler
  • XtimeBegin: Start a new batch of requests that are submitted to a scheduler
  • XtimeGroupSetNotification: Indicate that the client would like to be informed about the execution status of this batch of requests
  • XtimeEnd: Finish and submit a batch of requests to a scheduler
  • XtimeAbort: Finish a batch of requests, but don't submit them
  • XtimeBeginReplace: Start a batch of requests that are submitted to a scheduler; this batch may replace a previously submitted batch (the client identifies which batch to replace)
  • XtimeCancelGroup: Cancel a previously submitted batch of requests

Sample buffers

Sample compositing

  • XaudioMultiply: Multiply samples and put into destination buffer
  • XaudioMultiplyAccumalte: Multiply samples and accumulate into destination buffer
  • XaudioMultiplyConstant: Scale (multiply with constant) samples and put into destination buffer
  • XaudioMultiplyConstantAccumalte: Scale (multiply with constant) samples and accumulate into destination buffer
  • XaudioConvolute: Compute generalized discrete convolution of source samples and put result into destination sample buffer
  • XaudioConvoluteAccumulate: Compute generalized discrete convolution of source samples and put result into destination sample buffer
  • XaudioClamp (man-page missing): Clamp sample values to desired range

All of the above operations can also be submitted to a server-side scheduler for deferred execution

PCM Contexts

Helge Bahmann <hcb@chaoticmind.net>