# Difficulty with File Meta Source block

**URL:** <https://www.ruby-forum.com/t/difficulty-with-file-meta-source-block/230503>\
**Category:** GNU Radio\
**Created:** [June 20, 2014, 3:23pm UTC](https://www.ruby-forum.com/t/difficulty-with-file-meta-source-block/230503 "2014-06-20T15:23:53Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![jason\_sam](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/7993a0/32.png) [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\
**Post date:** [June 20, 2014, 3:23pm UTC](https://www.ruby-forum.com/t/difficulty-with-file-meta-source-block/230503/1 "2014-06-20T15:23:53Z")

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Hi all,

I want to use “File Meta source” & “File Meta sink” block from Gnu  
Radio.

My flow graph configuration is as follows : signal source (sine wave) →   
throttle → Meta file sink (Output.out)

Using above configuration I am able to write meta file (Output.out) with  
header information.  
But I want to see / separate the header information & data from this  
file  
(Output.out). I am not able to do so.

To do this, I tried to use “File Meta source” block but I am finding  
difficult to understand it.

Please help me out with “File Meta source” block & how to separate the  
header & data from meta file ?

My objective is to separate out header and data/samples from .wav file.

Thanks & Regards,  
Dushyant

–  
View this message in context:  
[http://gnuradio.4.n7.nabble.com/Difficulty-with-File-Meta-Source-block-tp49025.html](http://gnuradio.4.n7.nabble.com/Difficulty-with-File-Meta-Source-block-tp49025.html)  
Sent from the GnuRadio mailing list archive at [Nabble.com](http://Nabble.com).

---

<div class="post-metadata">

**Author:** ![dushyant.marathe](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/5f8ce5/32.png) [@dushyant.marathe](https://www.ruby-forum.com/u/dushyant.marathe)\
**Post date:** [June 20, 2014, 3:37pm UTC](https://www.ruby-forum.com/t/difficulty-with-file-meta-source-block/230503/2 "2014-06-20T15:37:34Z")

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On Fri, Jun 20, 2014 at 9:22 AM, dushyant.marathe  
\<[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)

> wrote:

> (Output.out). I am not able to do so.  
> Dushyant

Have you looked at the manual page describing the metadata file  
structure?

[http://gnuradio.org/doc/doxygen/page\_metadata.html](http://gnuradio.org/doc/doxygen/page_metadata.html)

It shows you how to use a tool that comes with GNU Radio that reads the  
header information out.

Tom