Composers Desktop Project Forum

Hi there,

I'm looking at ways of embedding the CDP programs in an existing system (FScape 2) where they would appear as sort of UGens.
I'm trying to figure out if there is a way to avoid having to write and read temporary audio files for I/O, for example by "piping" the audio input file into the process
and the audio output file from the process. This should work at least on Linux.

Something like this

./modify speed 2 special_in_pipe special_out_pipe 12

I'm pretty optimistic there is some way to get this working in Linux with the existing unmodified shell commands.

For example, I tried to use a named pipe (via mkfifo) as input and write to it from another process, but cdp terminates with

ERROR: INVALID DATA
ERROR: File /data/audio_work/my_pipe.aif either has unredable header, or is a textfile with a CDP reserved extension.

(I double checked that the contents written to the pipe is actually a valid AIFF file).

But then perhaps my idea can't work because certain process will need random access instead of serial stream?

Best, .h.h.

Hi there,

is there any documentation on the cdp shell programs? For example, when I browse through the 'Composers Desktop Project: Tutorial Workshop 1', it's not apparent to me which shell programs are actually invoked. Example:

A. MODIFY SPEED - simple pitch transposition, using semitones
   (SS: Soundfiles > Pitch >Transpose/Speed > semitones)
   (SL: PITCH: SPEED > pitch > tape transpose by semitones)

My guess is this is the `pitch` program, but which mode?

    altharms    octmove    transp    tune    pick    chordf    chord

I.e. where would I find the reference documentation for the pitch program?

Thanks!

Best, .h.h.

Hi,

I'm getting libsndfile errors playing back a generated file with SuperCollider. It looks like this:

File '/data/audio_work/out.wav' could not be opened: Error in WAV file. No 'data' chunk marker.

I can open the file in my own software and rewrite it into a "clean" file, and then it works.

More info:

$ sndfile-info /data/audio_work/out.wav
Error : Not able to open input file /data/audio_work/out.wav.
File : /data/audio_work/out.wav
Length : 2872680
RIFF : 2872672
WAVE
fmt  : 16
  Format        : 0x1 => WAVE_FORMAT_PCM
  Channels      : 2
  Sample Rate   : 48000
  Block Align   : 4
  Bit Width     : 16
  Bytes/sec     : 192000
PEAK : 24
  version    : 1
  time stamp : 1489253433
    Ch   Position       Value
     0   50682          0.518669
     1   30869          0.501828
cue  : 28
  Count : 1
   Cue ID : 1718183539  Pos :     0  Chunk : data  Chk Start : 0  Blk Start : 0  Offset :     0
LIST : 2016
  adtl
  *** note : 2004 (too big)
Have 0 marker at position 2148 (0x864).

Error in WAV file. No 'data' chunk marker.

hi there,

what am I doing wrong here:

$ ./pvoc anal 1 /data/audio_work/reverb-L.wav /data/audio_work/reverb-L.pvoc
ERROR: INVALID DATA
ERROR: Cannot open output file /data/audio_work/reverb-L.pvoc


Input is a 11 seconds monophonic file. Platform is Linux.

Thanks!

best regards, hanns holger