But how would that triggering work, and what would be triggered?
There's no other way than looking at the file itself to know how much has been
written already; this boils down to the very Unix discussion of how atomic
write() system calls should be in effect.
Best regards,
Marcus
Am 19. September 2016 03:57:59 GMT-07:00, schrieb Hasini Abeywickrama
<hva...@gmail.com>:
>Hi Marcus,
>
>That's what I'm currently doing. It's not very efficient as I have to
>constantly check the file size. If I can have a counter that is
>increments each time an FFT is written to the file by the flow graph I
>would be able to trigger an event based on the counter value. That was
>my concern.
>
>Regards,
>Hasini
>
>> On Sep 19, 2016, at 3:29 PM, Marcus Müller <marcus.muel...@ettus.com>
>wrote:
>>
>> If you need to do that externally, I'd just watch the file size and
>divide it by the item size (4B per floating point number) and by the
>FFT length.
>>
>>
>> Best regards,
>>
>> Marcus
>>
>>> On 09/18/2016 11:21 PM, Hasini Abeywickrama wrote:
>>> Hi Marcus,
>>>
>>> It's like I need to start reading and processing the file after a
>certain number of FFTs are being written to the file. For that I would
>need to maintain a counter and I'm trying to figure out how to do it.
>>>
>>> Regards,
>>> Hasini
>>>
>>>> On Mon, Sep 19, 2016 at 2:58 PM, Marcus Müller
><marcus.muel...@ettus.com> wrote:
>>>> What would you need that counter for? There's the 1/(FFT length)
>fixed relation between samples processed and numbers of FFTs done, so
>this is pretty much a redundant piece of info, but maybe I'm just
>missing the use case.
>>>>
>>>> Best regards,
>>>>
>>>> Marcus
>>>>
>>>> On 09/18/2016 10:23 PM, Hasini Abeywickrama wrote:
>>>>> Hi all,
>>>>>
>>>>> I have a GNU Radio flowgraph which uses a USRP to receive a
>signal, converts it to log power FFT and then writes the result to a
>file, using File Sink. I want to have a counter which increments with
>each FFT written to the file.
>>>>>
>>>>> Is there a way of maintaining and increasing count of the FFTs
>written to the file, while the flowgraph is still running?
>>>>>
>>>>>
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