Hello Paul,

Indeed it's working now :) I successfully converted my 16-bit IQ sample
file to a Cfile :) Thanks for all your help!!

On Thu, Dec 1, 2016 at 4:04 PM, Garver, Paul W <garv...@gatech.edu> wrote:

> I think you found an error in gr_mkheader! In truth, it isn’t particularly
> well tested so I’m glad you are using it. I just pushed a commit to fix
> this to github. git pull the changes, rebuild, and try again. Let me know
> if it solves the issue for you.
>
> PWG
>
> On Dec 1, 2016, at 11:46 AM, AndroidT Tester <itestandroid2...@gmail.com>
> wrote:
>
> Thank you once again Paul.
>
> ls -la
> drwx------ 1 Username Username       4096 Dec  1 13:40 .
> drwx------ 1 Username Username      12288 Nov 30 16:21 ..
> -rwx------ 1 Username Username 7683964928 Nov 20 18:23 Sample-408MHz
>
> gr_mkheader -r 1.8e6 -t sc16 -f 408e6 -l 1920991232 Sample-408MHz
>
>
> Now I have Sample-408MHz.hdr:
> gr_read_file_metadata Sample-408MHz.hdr -D
> HEADER 0
> Version Number: 0
> Sample Rate: 1800000.00 sps
> Seconds: 0.000000
> Item size: 4
> Data Type: short (1)
> .....
> .....
> ....
>
>
> etc.
>
> Now when I do
>
> gr_fileman Sample-408MHz Sample.cfile -o fc32
>
> I get
> sample_cnt_end=500000,final_index=1920991232
> Empty Header, quitting.
>
>
>
>
> On Thu, Dec 1, 2016 at 1:35 PM, Garver, Paul W <garv...@gatech.edu> wrote:
>
>> It probably can’t find the header. The command
>>
>> # gr_mkheader -r 1.8e6 -t sc16 -f 408e6 -l 1920991232 Sample-408MHz
>>
>> should produce the file "Sample-408MHz.hdr"
>>
>> Check that the file Sample-408MHz.hdr is produced. You can read it with
>>
>> # gr_read_file_metadata Sample-408MHz.hdr -D
>>
>> Then,
>>
>> # gr_fileman Sample-408MHz Sample-408MHz.cfile -o fc32
>>
>> Sample-408MHz should be the raw data, and Sample-408MHz.hdr the metadata
>> produced with gr_mkheader.  This should produce
>> Sample-408MHz.cfile and Sample-408MHz.cfile.hdr.
>>
>> On your copied command it appears you didn’t add the -o fc32 to specify
>> you want a file type conversion.
>>
>> PWG
>>
>>
>>
>>
>> On Dec 1, 2016, at 11:20 AM, AndroidT Tester <itestandroid2...@gmail.com>
>> wrote:
>>
>> Thank you Paul,
>>
>> I got this;
>> sample_cnt_end=500000,final_index=1920991232
>> Empty Header, quitting.
>>
>> I followed all your instructions and double checked all parameters. I did
>> filesize / 4 for sample count.
>> I did this first:
>>
>> gr_mkheader -r 1.8e6 -t sc16 -f 408e6 -l 1920991232 Sample-408MHz
>>
>>
>> Then when I try to do:
>>
>> gr_fileman Sample-408MHz Sample.cfile
>>
>> I got the error above, what am I missing?
>>
>> On Thu, Dec 1, 2016 at 12:07 PM, Garver, Paul W <garv...@gatech.edu>
>> wrote:
>>
>>> There are two different metadata types:
>>> 1) Inline
>>> 2) Detached
>>>
>>> Here, you are using the detached headers. With detached, the raw samples
>>> are in a file, say myfile.sc16, and the metadata in myfile.sc16.hdr. See
>>> [1] for more information on GNURadio metadata.
>>> So suppose you have myfile.sc16 as your raw sample file. Then you
>>> generate headers for it, since you didn’t record it with any. You also need
>>> to give gr_mkheader -l num_samps so it knows how long the file is. For sc16
>>> you just do file_size_bytes/4 to get # of samples in a file.
>>>
>>> # gr_mkheader -r 1.8e6 -t sc16 -f 408e6 myfile.sc16
>>>
>>> This generates the file: myfile.sc16.hdr containing the file type,
>>> center frequency, sample rate, etc. This is simply my convention, but the
>>> metadata is “linked” to the raw samples by the filename
>>> raw data: myfile.sc16, where sc16 specifies the file format.
>>> metadata: myfile.sc16.hdr
>>>
>>> Then, you can give this to gr_fileman to convert the type:
>>>
>>> # gr_fileman myfile.sc16 myfile.fc32 -o fc32
>>>
>>> gr_fileman looks for filename.hdr for the detached header info. So in
>>> this case, it files myfile.sc16.hdr, and should happily convert for you.
>>>
>>> PWG
>>>
>>>
>>>
>>>
>>>
>>> [1] http://gnuradio.org/doc/doxygen/page_metadata.html
>>>
>>> On Dec 1, 2016, at 9:45 AM, AndroidT Tester <itestandroid2...@gmail.com>
>>> wrote:
>>>
>>> Thank you Paul, I never heard of gr-analysis before.
>>> So I tried this:
>>>
>>> gr_mkheader -r 1.8e6 -t sc16 -f 408e6 myheader
>>>
>>> This only created myheader.hdr file. How can I link this to my actual
>>> recording sample which is 16-bit IQ pair and then convert it to CFile?
>>> Do I concatenate the files? put myheader.hdr at top of my recording?
>>> Sorry again for these newbie questions
>>>
>>>
>>>
>>> On Thu, Dec 1, 2016 at 11:32 AM, Garver, Paul W <garv...@gatech.edu>
>>> wrote:
>>>
>>>> Please copy the list next time so other folks can respond besides me.
>>>>
>>>> Just attach a file sink to the ishort to complex block. There’s also a
>>>> command-line tool called gr_fileman in gr-analysis [1] which will do this,
>>>> but the file needs headers. If you don’t have them, you can generate with
>>>> gr_mkheader in gr-analysis.
>>>>
>>>> [1] https://github.com/garverp/gr-analysis
>>>>
>>>> Hope this helps,
>>>> PWG
>>>>
>>>> On Dec 1, 2016, at 9:22 AM, AndroidT Tester <itestandroid2...@gmail.com>
>>>> wrote:
>>>>
>>>> Now, how can I convert this to a CFILE format where I can play it in
>>>> Gqrx? Thank you
>>>>
>>>> On Wed, Nov 30, 2016 at 11:34 AM, AndroidT Tester <
>>>> itestandroid2...@gmail.com> wrote:
>>>>
>>>>> Thank you very much! It worked :)
>>>>>
>>>>> On Wed, Nov 30, 2016 at 11:04 AM, Garver, Paul W <garv...@gatech.edu>
>>>>> wrote:
>>>>>
>>>>>> Use a file source block with “short” type into an “Ishort to Complex”
>>>>>> block. The Ishort to Complex block will de-interleave the shorts into
>>>>>> complex samples.
>>>>>>
>>>>>> PWG
>>>>>> > On Nov 30, 2016, at 8:55 AM, AndroidT Tester <
>>>>>> itestandroid2...@gmail.com> wrote:
>>>>>> >
>>>>>> > Hey guys,
>>>>>> >
>>>>>> > I have a sample file with IQ pairs, each I and Q is 16-bits, I want
>>>>>> to load this in GNURadio companion using File source sink, but I'm not 
>>>>>> sure
>>>>>> how can I specify 16-bit format for I and 16-bit for Q in Gnuradio
>>>>>> companion and then connect it to lets say FFT or Waterfall widget. Can
>>>>>> someone advise a bit?
>>>>>> >
>>>>>> > Thank you!
>>>>>> > _______________________________________________
>>>>>> > Discuss-gnuradio mailing list
>>>>>> > Discuss-gnuradio@gnu.org
>>>>>> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>>>>>>
>>>>>>
>>>>>
>>>>
>>>>
>>>
>>>
>>
>>
>
>
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