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 <[email protected]> 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 <[email protected]> > 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 <[email protected]> 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 <[email protected]> >> 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 <[email protected]> >> 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 <[email protected]> >>> 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 <[email protected]> >>> 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 <[email protected]> >>>> 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 < >>>> [email protected]> wrote: >>>> >>>>> Thank you very much! It worked :) >>>>> >>>>> On Wed, Nov 30, 2016 at 11:04 AM, Garver, Paul W <[email protected]> >>>>> 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 < >>>>>> [email protected]> 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 >>>>>> > [email protected] >>>>>> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>>>>> >>>>>> >>>>> >>>> >>>> >>> >>> >> >> > >
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