Re: [Discuss-gnuradio] Wav sink problem

[Anton Komarov]

Martin,
actually no, i am not sure.
i am just pushing stop button in gnuradio companion.

from grc perspective view, what method is supposed to be used for
graceful script termination?

On Thu, Sep 27, 2012 at 7:07 PM, Martin Braun (CEL)
<address@hidden> wrote:
> On Thu, Sep 27, 2012 at 06:55:08PM +0400, Anton Komarov wrote:
>> Hi, Martin, thanks for reply.
>>
>> In Audacity i see only gray background and no signal.
>>
>> Actually i have started with nbfm reciever and tried to save audio in
>> wav file. That i tried to redirect it to audio sink and audio was ok.
>> Than i tried to use very simple scheme with audio source to wav sink
>> and realize that wav file is broken.
>>
>> I do not think it is good when soxi not shoing time length for the
>> file - that means file is broken.
>
> Are you making sure the flow graph is terminated correctly? If you
> simply kill the flow graph, the WAV block has no chance to write a
> correct file header. This happens in the block destructor, or when you
> call close().
> If you can't do that, you must use gr_file_sink.
>
> MB
>
>>
>> On Thu, Sep 27, 2012 at 6:42 PM, Martin Braun (CEL)
>> <address@hidden> wrote:
>> > Hi Anton,
>> >
>> > I'd rather look if your audio source is producing the correct samples.
>> >
>> > On Thu, Sep 27, 2012 at 12:51:20AM +0400, Anton Komarov wrote:
>> >> i construct very simple scheme Audio Source --> Wav Sink
>> >> gr generates non-null wav file
>> >> -rw-rw-r-- 1 anton anton 24M сент. 27 00:46 freq2.wav
>> >
>> > Looks good.
>> >
>> >> $ soxi freq2.wav
>> >>
>> >> Input File     : 'freq2.wav'
>> >> Channels       : 1
>> >> Sample Rate    : 44100
>> >> Precision      : 16-bit
>> >> Sample Encoding: 16-bit Signed Integer PCM
>> >
>> > Looks good, too.
>> >
>> >> e.g.
>> >> soxi info on good wav file
>> >>
>> >> $ soxi arecord.wav
>> >>
>> >> Input File     : 'arecord.wav'
>> >> Channels       : 1
>> >> Sample Rate    : 8000
>> >> Precision      : 8-bit
>> >> Duration       : 00:00:02.38 = 19000 samples ~ 178.125 CDDA sectors
>> >> File Size      : 19.0k
>> >> Bit Rate       : 64.1k
>> >> Sample Encoding: 8-bit Unsigned Integer PCM
>> >>
>> >> look at Sample Encoding - it is Signed for gnuradio and Unsigned for all 
>> >> others.
>> >
>> > You're comparing 16- with 8-Bit. They're different.
>> >
>> > Check the WAV file with Audacity. You can also connect the WAV sink to a
>> > signal source for further tests.
>> >
>> > M
>> >
>> > --
>> > Karlsruhe Institute of Technology (KIT)
>> > Communications Engineering Lab (CEL)
>> >
>> > Dipl.-Ing. Martin Braun
>> > Research Associate
>> >
>> > Kaiserstraße 12
>> > Building 05.01
>> > 76131 Karlsruhe
>> >
>> > Phone: +49 721 608-43790
>> > Fax: +49 721 608-46071
>> > www.cel.kit.edu
>> >
>> > KIT -- University of the State of Baden-Württemberg and
>> > National Laboratory of the Helmholtz Association
>> >
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>>
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> --
> Karlsruhe Institute of Technology (KIT)
> Communications Engineering Lab (CEL)
>
> Dipl.-Ing. Martin Braun
> Research Associate
>
> Kaiserstraße 12
> Building 05.01
> 76131 Karlsruhe
>
> Phone: +49 721 608-43790
> Fax: +49 721 608-46071
> www.cel.kit.edu
>
> KIT -- University of the State of Baden-Württemberg and
> National Laboratory of the Helmholtz Association
>
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