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Digitized Audio Utility for Linux ver. 0.3
============================================
This directory contains vplay.c, a modified version of recplay.c.
vrec and vplay
--------------
These programs can be used for recording and playing:
CREATIVE LABS VOICE files
MICROSOFT WAVE file (old format only (new format is handled as raw data))
NeXT sound files (similar to Sun's .au format)
raw audio data.
Both programs accept the same options:
vrec [-qvwrS] [-s speed] [-t seconds] -b bits [filename1 ...]
vplay [-qvwrS] [-s speed] [-t seconds] -b bits [filename1 ...]
-S Stereo (default is mono).
-s speed Sets the speed (default is 8 kHz). If the speed is
less than 300, it will be multiplied by 1000.
-t seconds Sets the recording (or playback) time in seconds.
(Default is no time limit).
-t bits Sets sample size (bits/sample). Possible values are
8 and 16 (default 8).
-v record a CREATIVE LABS VOICE file (default)
-w record a MICROSOFT WAVE file
-r record raw data without header
-a record a NeXT sound file
-q quiet mode
The options for speed, time etc. take only effect if you playing
raw data files (or recording). VOC and WAVE-files include this
information in their headers/internal structure.
If no filenames are given, stdout (vrec) or stdin (vplay) is used.
The -t parameter applies to each files. For example
vrec -r -t 1 a b c
records one second of audio data to each of the files a, b, and c and
vplay -t 1 a b c
plays the first second of each of the files a, b and c (if its
raw audio).
Don't use higher recording speeds than your card supports. This error is not
always detected by the driver.
vplay supports:
- the full CREATIVE LABS VOICE structure:
Silence, Repeat loops (on seekable input), Stereo, ASCII blocks,
blocks with different sampling rate
- on non-stereo cards (SB 1.0 - 2.0) 8 bit stereo files will be
played as mono (the first channel is used)
- on non-16-bit cards, 16 bit WAVE files will be played as 8 bit
(you can really play on a SB 1.0 a 16 bit stereo WAVE file, or
buy ...)
unsupported:
- packed VOC files (because /dev/dsp can't it (yet ?))
- multi block WAVE files (if there exists like VOC files, my specs
says no but RIFF definition yes ???)
- not PCM coded WAVE files (because I don't know other methods)
- more channel WAVE files (somebody has a quadrophonic sample?)
- alaw- or mulaw-encoded NeXt sound files
Michael Beck beck@informatik.hu-berlin.de
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