dumpk — Periodically writes an orchestra control-signal value to an external file.
Periodically writes an orchestra control-signal value to a named external file in a specific format.
ifilname -- character string (in double quotes, spaces permitted) denoting the external file name. May either be a full path name with target directory specified or a simple filename to be created within the current directory
iformat -- specifies the output data format:
1 = 8-bit signed char(high order 8 bits of a 16-bit integer
4 = 16-bit short integers
5 = 32-bit long integers
6 = 32-bit floats
7 = ASCII long integers
8 = ASCII floats (2 decimal places)
Note that A-law and U-law output are not available, and that all formats except the last two are binary. The output file contains no header information.
iprd -- the period of ksig output in seconds, rounded to the nearest orchestra control period. A value of 0 implies one control period (the enforced minimum), which will create an output file sampled at the orchestra control rate.
ksig -- a control-rate signal
This opcode allows a generated control signal value to be saved in a named external file. The file contains no self-defining header information. But it contains a regularly sampled time series, suitable for later input or analysis. There may be any number of dumpk opcodes in an instrument or orchestra but each must write to a different file.
Here is an example of the dumpk opcode. It uses the file dumpk.csd. Note that the example must be run from a directory for which the user has write access.
Example 253. Example of the dumpk opcode.
See the sections Real-time Audio and Command Line Flags for more information on using command line flags.
<CsoundSynthesizer> <CsOptions> ; Select audio/midi flags here according to platform ; Audio out Audio in -odac -iadc ;;;RT audio I/O ; For Non-realtime ouput leave only the line below: ; -o dumpk.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> ; Initialize the global variables. sr = 44100 kr = 20 nchnls = 1 ; By Andres Cabrera 2008 instr 1 ; Write fibonacci numbers to file "fibonacci.txt" ; as ascii long integers (mode 7), using the orchestra's ; control rate (iprd = 0) knumber init 0 koldnumber init 1 ktrans init 1 ktrans = knumber knumber = knumber + koldnumber koldnumber = ktrans dumpk knumber, "fibonacci.txt", 7, 0 printk2 knumber endin </CsInstruments> <CsScore> ;Write to the file for 1 second. Since control rate is 20, 20 values will be written i 1 0 1 </CsScore> </CsoundSynthesizer>
Here is another example of the dumpk opcode. It uses the file dumpk-2.csd.
Example 254. Example 2 of the dumpk opcode.
<CsoundSynthesizer> <CsOptions> ; Select audio/midi flags here according to platform -odac ;;;realtime audio out ;-iadc ;;;uncomment -iadc if realtime audio input is needed too ; For Non-realtime ouput leave only the line below: ; -o dumpk-2.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 44100 ksmps = 32 nchnls = 2 0dbfs = 1 giSine ftgen 0, 0, 2^10, 10, 1 instr 1 ;writes a control signal to a file kfreq randh 100, 1, 2, 1, 500 ;generates one random number between 400 and 600 per second dumpk kfreq, "dumpk.txt", 8, 1 ;writes the control signal printk 1, kfreq ;prints it endin instr 2 ;reads the file written by instr 1 kfreq readk "dumpk.txt", 8, 1 printk 1, kfreq ;prints it aout poscil .2, kfreq, giSine outs aout, aout endin </CsInstruments> <CsScore> i 1 0 5 i 2 5 5 e </CsScore> </CsoundSynthesizer>
Its output should include lines like this:
WARNING: Seeding from current time 683384022 i 1 time 1.00033: 463.64510 i 1 time 2.00000: 463.64510 i 1 time 3.00000: 483.14200 i 1 time 4.00000: 567.55973 i 1 time 5.00000: 576.37060 i 1 time 6.00000: 460.66550 i 2 time 6.00033: 463.64510 i 2 time 7.00000: 463.64510 i 2 time 8.00000: 483.14200 i 2 time 9.00000: 567.55970 i 2 time 10.00000: 576.37060 i 2 time 11.00000: 460.66550