Townshend Computer Tools DAT-Link - 5.9 Playing Multiple Files; 5.10 Using Standard Input

5.9 Playing Multiple Files 57
For example, the command:
naplay -e ieee file
plays back a le of oating p ointnumbers. For the linear enco ding, the number of
bits/sample can also be specied using the -p option. To playback a le containing
20-bit samples use:
naplay -p20 file
Note that the data is assumed to be packed such that every pair of samples will
occupy 5 bytes. Valid choices of the precision are 4, 8, 12, 16, 20, 24, 28, or 32
bits/sample.
Note that not all combinations of the -f , -e , and -p options are valid. Certain le
formats support only particular enco dings and precisions. Attempting to playback
a le with an enco ding or precision dierent from that with whichitwas recorded
will either be rejected or result in incorrect playback. Also, if sample-rate conversion
is being used, the software currently supp orts 16 bit/sample, linear encoding only.
5.9 Playing Multiple Files
Multiple les maybeplayed without anyintervening gap by listing each le on the
command line:
naplay file1 file2 file3
The same settings (sampling rate, precision, etc. ) are used for playback of each
le. If a space is required b etween each le, then additional les containing zero es
can be created and inserted between each le. For example, for stereo playback
at 48,000 samples/second, the following commands will create a le containing one
second of silence and insert it between each le
2
:
dd if=/dev/zero bs=4 count=48000 of=gap
naplay file1 gap file2 gap file3
5.10 Using Standard Input
If no lename is given on the command line, then the audio input data is taken
from the standard input. This allows another program which generates sampled
2
/dev/zero does not exist on all versions of UNIX