GEN49 — Transfers data from an MP3 soundfile into a function table.
size -- number of points in the table. Ordinarily a power of 2 or a power-of-2 plus 1 (see f statement); the maximum tablesize is 16777216 (224) points. The allocation of table memory can be deferred by setting this parameter to 0; the size allocated is then the number of points in the file (probably not a power-of-2), and the table is not usable by normal oscillators, but it is usable by a loscil unit. The soundfile can also be mono or stereo.
filcod -- integer or character-string denoting the source soundfile name. An integer denotes the file soundin.filcod ; a character-string (in double quotes, spaces permitted) gives the filename itself, optionally a full pathname. If not a full path, the file is sought first in the current directory, then in that given by the environment variable SSDIR (if defined) then by SFDIR. See also soundin.
skiptime -- begin reading at skiptime seconds into the file.
format -- specifies the audio data-file format required:
1 - Mono file 3 - First channel (left)
2 - Stereo file 4 - Second channel (right)
If format = 0 the sample format is taken from the soundfile header.
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Here is a simple example of the GEN49 routine. It uses the files gen49.csd, and beats.mp3. It uses the MP3 file “beats.mp3”.
Example 728. A simple example of the GEN49 routine.
<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 gen01.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> ; Initialize the global variables. sr = 44100 kr = 4410 ksmps = 10 nchnls = 1 ; Instrument #1. instr 1 kamp = 30000 kcps = 1 ifn = 1 ; Play the audio sample stored in Table #1. a1 oscil kamp, kcps, ifn out a1 endin </CsInstruments> <CsScore> ; Table #1: read an audio file (using GEN49). f 1 0 131072 49 "beats.mp3" 0 1 ; Play Instrument #1 for 2 seconds. i 1 0 2 e </CsScore> </CsoundSynthesizer>