On Tue, 21 Apr 2009, Tzafrir Cohen wrote:
> WAV is a pretty simple container format. The length is written in a very
> expected place in the header:
>
> http://en.wikipedia.org/wiki/.wav
> http://ccrma.stanford.edu/courses/422/projects/WaveFormat/
>
> E.g. the following:
>
> wav_size() {
> LANG=C cut -b 41-44 "$1" | head -n 1 | hexdump -e "\"$1:"'$1: %u\n"' |
> head -n 1
> }
Or:
wav_size()
{
dd bs=1 count=4 if="$1" skip=40 2>/dev/null\
| hexdump -e "\"$1:"'$1: %u\n"'
}
Or, if hexdump's "-s" did what the man page says it did:
wav_size()
{
dd count=1 if="$1" 2>/dev/null\
| hexdump -s 40 -n 4 -e "\"$1:"'$1: %u\n"'
}
but "-s" does a "seek" not a "skip" as documented thus seeking on stdin
fails.
I always learn something new from Tzafrir's postings :)
I still haven't figured out the format string...
Thanks in advance,
------------------------------------------------------------------------
Steve Edwards [email protected] Voice: +1-760-468-3867 PST
Newline Fax: +1-760-731-3000
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