Hello Alan,
Well done.
I think Jeroen added the general functionality you want with functions
like freedv_codecrx(). freedv_rx has an example of using this function.
However looking at freedv_api.c, freedv_codecrx() doesn't appear to
support the 700D demodulator yet, I think it just needs something like:
if (f->mode == FREEDV_MODE_700D) {
nout = freedv_comprx_700d(f, demod_in, &valid);
}
Cheers,
David
On 04/07/18 16:55, Alan Beard wrote:
> Hi all,
>
> I'm no c++ programmer but with the aid or the "system("do shell")"
> function, I have modified the freeBeacon code and it's up running.
>
> I now need to read the FreeDV api to find if there's a way to capture
> the ofdm decoded data during reception.
> At present, after the radio audio is captured, I decode it with "ofdm_decode"
> and regenerate Tx audio with "ofdm_mod". Then convert that to a 16bit WAV
> file.
> This decode and encode regenerates a "perfect" Tx audio. Looks beautiful
> on the spectrum display of FreeDV GUI. Though when played with "aplay" on
> this here Linux box's motherboard audio sounds glitchy.
>
> All this is running on my Pi with a 120Gb SSD.
>
> 14236KHz is a bit busy here with SSB traffic. 14150 and 14153 are beset with
> switchmode hash. 7177 is often even worse with S9 hash from the Optus HFC
> cable box.
>
> === Living in the suburbs ===
>
> MRFE6S9160 Can I ask who has ever used a 73 valve in ham radio?
>
> Alan VK2ZIW
>
>
>
>
> On Fri, 29 Jun 2018 17:27:37 +0930, David Rowe wrote
>> Hello Alan,
>>
>>> I tried:
>>> ./build1/src/c2enc 700D ./wav/vk5qi.wav /tmp/test2.tst --bitsperchar
>>>
>>> Only to find mode 700D is not in "c2enc".
>>
>> Yes the nomenclature is a bit confusing. Codec 2 has various modes that
>> don't always map directly to FreeDV waveforms with similar names. So
>> FreeDV 1600 uses Codec 2 1300 and FreeDV 700D uses Codec 2 700C.
>>
>> So you want something like:
>>
>> $ ./build1/src/c2enc 700C ./wav/vk5qi.wav /tmp/test2.tst --bitsperchar
>>
>>> I think I'm ready to write a Repeater script. Anybody have any thoughts?
>>
>> You might need a C application to handle things like a state machine
>> for loss of sync, but see how you go with a script. The FreeDV
>> beacon C code would be very close to what you need for a parrot repeater.
>>
>>> Notes/Corrections:
>>>
>>> README_fdmdv.txt mentions "src/fdmdv.h" that is perhaps "src/fdmdv_api.h"
>>
>> Thanks
>>
>>> ./cohpsk_ch Can't find slow fading file:
>>> ../../raw/slow_fading_samples.float
>>
>> When cohpsk_ch chokes it prints out instructions on how to generate this
>> file (if not present) with some Octave commands. Also see
>> cohpsk_ch.c source.
>>
>>> I haven't yet found a way to command line play a 700D "raw" file. This
>>> I'd like for monitoring:
>>
>> $ ./freedv_rx 700D test.raw - | aplay -f S16
>>
>> Many examples in README_ofdm.txt
>>
>> - David
>>
>> ------------------------------------------------------------------------------
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>
>
> Alan
>
> Evil flourishes when good men do nothing.
> Consider the Christmas child.
> ---------------------------------------------------------------------------
> Alan Beard Unix Support Technician from 1984 to today
> 70 Wedmore Rd. Sun Solaris, AIX, HP/UX, Linux, SCO, MIPS
> Emu Heights N.S.W. 2750 Routers, terminal servers, printers, terminals etc..
> +61 2 47353013 (h) Support Programming, shell scripting, "C", assembler
> 0414 353013 (mobile) After uni, electronics tech
>
>
> ------------------------------------------------------------------------------
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