pvsfread — Read a selected channel from a PVOC-EX analysis file.
Create an fsig stream by reading a selected channel from a PVOC-EX analysis file loaded into memory, with frame interpolation. Only format 0 files (amplitude+frequency) are currently supported. The operation of this opcode mirrors that of pvoc, but outputs an fsig instead of a resynthesized signal.
ifn -- Name of the analysis file. This must have the .pvx file extension.
A multi-channel PVOC-EX file can be generated using the extended pvanal utility.
ichan -- (optional) The channel to read (counting from 0). Default is 0.
ktimpt -- Time pointer into analysis file, in seconds. See the description of the same parameter of pvoc for usage.
Note that analysis files can be very large, especially if multi-channel. Reading such files into memory will very likely incur breaks in the audio during real-time performance. As the file is read only once, and is then available to all other interested opcodes, it can be expedient to arrange for a dedicated instrument to preload all such analysis files at startup.
idur filelen "test.pvx" ; find dur of (stereo) analysis file
kpos line 0,p3,idur ; to ensure we process whole file
fsigr pvsfread kpos,"test.pvx",1 ; create fsig from R channel
(NB: as this example shows, the filelen opcode has been extended to accept both old and new analysis file formats).