| maybe i dont understand, but why use the 'ifilename' variable? why not use the output
filename specified in the command line? why give this fout opcode the power to change the
output filename?
just curious
pete
Gabriel Maldonado wrote:
> Santa Claus is arriving!
>
> I've just finished to write some opcodes for multi-channel files.
> The new opcode 'fout' allow the output to a file of any number of audio channels (for now
> the limit is arbitrary locked to 64, bat can be increased). It supports .wav format for
> mono and stereo files in integer, raw format (without header) for 16 bit integer and 32
> bit floating-point with any number of channels. In future, when the standard for
> multichannel files will be definitively defined, it will support any format.
> I will send the sources to JPFF as soon as I can.
> A'vincr' and 'clear' opcodes are new useful tools when using 'fout'.
> A modification of rdorch.c and entry.c files is needed to allow variant argument list at
> a-rate.
>
> fout opcode:
>
> fout "ifilename", iformat, aout1 [, aout2, aout3,....]
>
> DESCRIPTION
>
> Output a list of audio signal to a specified file
>
> INITIALIZATION
>
> ifilename - a double-quote delimited string file name
> iformat - a flag to choose output file format:
> 0 - 16-bit integers without header
> 1 - 32-bit floating point samples without header
> 2 - 16-bit integers with .wav type header
>
> PERFORMANCE
>
> aout1,... aoutN - output signals
>
> This opcode allows to write samples of audio signals to a file with any number of
> channels. Channel number depends by the
> number of aoutN variables (i.e. a mono signal with only an a-rate argument, a stereo
> signal with two a-rate arguments etc.)
> Maximum number of channels is fixed to 64.
>
> More fout opcodes can be present in the same instrument, allowing to open more audio to
> disk streams in parallel.
>
> Notice that, differently by out, outs and outq, fout does not zeroes the audio variable,
> so you must provide a zeroing after calling
> fout is poliphony is used. You can use incr and clear opcodes for this task.
>
> vincr, clear
>
> vincr asig, aincr
> clear avar1 [,avar2, avar3,...,avarN]
>
> DESCRIPTION
>
> vincr increments an audio variable of another signal, i.e. accumulates output.
> clear zeroes a list of audio signals.
>
> PERFORMANCE
>
> asig - audio variable to be incremented
> aincr - incrementation signal
> avar1 [,avar2, avar3,...,avarN] - signals to be zeroed
>
> vincr (variable increment) and clear are thinked to be used togheter. vincr stores the
> result of the sum of two audio variables
> into the first variable itself (which is thinked to be used as accumulator in case of
> polyphony). The accumulator-variable can be
> used for output signal by means of fout opcode. After the disk writing operation, the
> accumulator-variable should be set to zero
> by means of clear opcode (or it will explode).
>
> EXAMPLE OF 'FOUT', 'INCR' AND 'CLEAR':
> -------------------------------------
> ;ORC
> sr = 44100
> kr = 441
> ksmps = 100
> nchnls = 1
>
> ga1 init 0
> ga2 init 0
> ga3 init 0
> ga4 init 0
>
> ;***************************************************
> instr 1
> ;***************************************************
> k1 linseg 0,p3/3,1,p3/6,.5,p3/3,.5,p3/6,0
> a1 oscili 10000,p4,1
> a2 oscili 10000, p4*1.234567,1
> a3 oscili 10000, p4*1.5,1
> a4 oscili 10000, p4*.766,1
>
> vincr ga1,a1*k1
> vincr ga2,a2*k1
> vincr ga3,a3*k1
> vincr ga4,a4*k1
>
> out a1
> endin
>
> ;***************************************************
> instr 2
> ;***************************************************
> fout "fout.wav" ,2,ga1,ga2
> fout "fout2.wav" ,2,ga3,ga4
> clear ga1,ga2,ga3,ga4
> endin
>
> ;-----------------------
> ;SCO
> f1 0 4096 10 1
> i1 0 1.8 106
> i1 1.5 2 123.66
> i1 3.1 2 51.123335
> i2 0 10
>
> --
> Gabriel Maldonado
>
> http://www.agora.stm.it/G.Maldonado/home2.htm |