There was discussion once about file formats for saved data.
I just used Jim Cooley’s file headers to put timestamps in my
shortwave radio data so when I play back a pirate radio broadcast
I can see that, hey, that was on last Saturday at 8:15PM. The
gui now sports a clock showing either current or playback time.
gr.file_hdr_sink|source seem pretty flexible, just an arbitrary
length of int’s that can mean anything you want to define. Anyway,
if they were made an integral part or gnuradio I will update the
gnuradio-examples/python/apps/hf_explorer to include the new feature.
On Tue, 2006-09-19 at 11:45 -0400, Charles S. wrote:
I just used Jim Cooley’s file headers to put timestamps in my
shortwave radio data so when I play back a pirate radio broadcast
I can see that, hey, that was on last Saturday at 8:15PM. The
gui now sports a clock showing either current or playback time.
gr.file_hdr_sink|source seem pretty flexible, just an arbitrary
length of int’s that can mean anything you want to define. Anyway,
Oh well - unfortunately, it’s a case of gaining on thing, metadata, but
losing another, the ability to SEEK around in the data file!
On Tue, Sep 19, 2006 at 06:04:15PM -0400, Chuck Swiger wrote:
Oh well - unfortunately, it’s a case of gaining on thing, metadata, but
losing another, the ability to SEEK around in the data file!
Actually, best I can do with header timestamps is a ‘fast forward’ by
connecting the file src to a null_sink, that does about a minute every 3
seconds Rewind is still impossible, but de-headering to raw data
is easy.
–Chuck
Chuck,
gr.file_source has a seek method which will allow you to seek
instantly anywhere in the file.
[Actually, I note that it’s defined with a long instead of int64_t
offset, so to move more than 4GB, you have to do it in multiple steps]
On Tue, 2006-09-19 at 13:28 -0400, Charles S. wrote:
losing another, the ability to SEEK around in the data file!
Actually, best I can do with header timestamps is a ‘fast forward’ by
connecting the file src to a null_sink, that does about a minute every 3
seconds Rewind is still impossible, but de-headering to raw data
is easy.
that uses a header-size and data-size that can’t just
be skipped over w/o everything getting out of sync.
Anyway, mission (mostly) accomplished - and being able to embed
information like decimation, center frequency, time of day, gps
position, etc is pretty handy.
–Chuck
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Rewind is still impossible, but de-headering to raw data