[Hackrf-dev] playing back osmocom_fft cfiles

[Mike Walters]

The HackRF format uses interleaved 8-bit signed integers and the cfile
format (from osmocom_fft, GNURadio, etc.) uses interleaved 32-bit floating
point numbers.
By 'interleaved' I mean that it's just I, Q, I, Q, etc.

A quick and easy way I use to convert between them on the command-line is
to use sox:

sox -t f32 osmocom_fft_recording.cfile -t s8 hackrf_transfer_recording.cs8

(to convert from a cfile recorded with osmocom_fft to a file you could
replay with hackrf_transfer)

On 29 March 2016 at 00:55, Brent Thorne <brentathorne at gmail.com> wrote:

> Hi all,
>
> I'd like to be able to playback files captured in osmocom_fft.
> Initially I was thinking I could use hackrf_transfer, but the file
> format appear to be different.  Can anyone help me understand the
> differenced between the two file formats, osmocom_fft cfiles and
> hackrf_transfer files?   I think the hackrf output format is two
> bytes, or I and Q data.  Is that correct?  Not sure what format the
> osmocom tools outputs, gnuradio?
>
> Maybe a transcoder tool already exist or there is a better way to
> playback files captured with osmocom_fft or gnuradio.  I can capture
> and playback files with hackrf_transfer, but often want visualize,
> annotate and playback a select part of the capture.  Is there a better
> way to do this.
>
> Best,
>
> Brent
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