Hi, i construct very simple scheme Audio Source --> Wav Sink gr generates non-null wav file -rw-rw-r-- 1 anton anton 24M . 27 00:46 freq2.wav but when i try to play it or fetch info about file with soxi (sox plugin) i got nothing aplay freq2.wav WAVE 'freq2.wav' : Signed 16 bit Little Endian, 44100 , <imidiate stop> and soxi freq2.wav shows $ soxi freq2.wav Input File : 'freq2.wav' Channels : 1 Sample Rate : 44100 Precision : 16-bit Sample Encoding: 16-bit Signed Integer PCM so it seems to me wav sink produces corrupted wav files or ... what am i doing wrong? 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.
on 2012-09-26 22:52
on 2012-09-27 16:43
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. > 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
on 2012-09-27 16:56
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. On Thu, Sep 27, 2012 at 6:42 PM, Martin Braun (CEL)
on 2012-09-27 17:09
On Thu, Sep 27, 2012 at 06:55:08PM +0400, Anton Komarov wrote: > 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 > >> -rw-rw-r-- 1 anton anton 24M сент. 27 00:46 freq2.wav > > > >> Precision : 8-bit > > signal source for further tests. > > Kaiserstraße 12 > > _______________________________________________ > > Discuss-gnuradio mailing list > > Discuss-gnuradio@gnu.org > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio -- 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
on 2012-09-27 17:14
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)
on 2012-09-27 17:18
I recall running into this issue myself now, with multimode and simple_fm_rcv. What I do in those two apps is that when I turn "off" recording, I change the wavfile filename to /dev/null, which causes a formal cleanup-and-close of the previous file. On 27 Sep 2012 11:13, Anton Komarov wrote: > 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 2012-09-27 17:29
So it can programmed with GRC, or i supposed to make some stuff in python script?
on 2012-09-27 17:32
On 27 Sep 2012 11:28, Anton Komarov wrote: > So it can programmed with GRC, or i supposed to make some stuff in > python script? > > On Thu, Sep 27, 2012 at 7:17 PM, <mleech@ripnet.com> wrote: > >> I recall running into this issue myself now, with multimode and simple_fm_rcv. What I do in those two apps is that when I turn "off" recording, I change the wavfile filename to /dev/null, which causes a formal cleanup-and-close of the previous file. On 27 Sep 2012 11:13, Anton Komarov wrote: 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? O _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org [1] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio [2] Use a conditional expression in the "filename" field of the wavefile sink, and then have a "checkbox" control to control recording. Make the expression conditional on the state of the checkbox, and if "recording" isn't checked, make the file /dev/null, otherwise make it the file you want. Links:
on 2012-09-27 17:59
Ok i see. And, if i want to run script from shell to record audio files and rotate them every hour, how to make start/stop recording procedure in this case?
on 2012-09-27 18:05
On 27 Sep 2012 11:58, Anton Komarov wrote: > Ok i see. > > And, if i want to run script from shell to record audio files and > rotate them every hour, how to make start/stop recording procedure in > this case? > > On Thu, Sep 27, 2012 at 7:31 PM, <mleech@ripnet.com> wrote: > >> On 27 Sep 2012 11:28, Anton Komarov wrote: So it can programmed with GRC, or i supposed to make some stuff in python script? On Thu, Sep 27, 2012 at 7:17 PM, <mleech@ripnet.com [1]> wrote: I recall running into this issue myself now, with multimode and simple_fm_rcv. What I do in those two apps is that when I turn "off" recording, I change the wavfile filename to /dev/null, which causes a formal cleanup-and-close of the previous file. On 27 Sep 2012 11:13, Anton Komarov wrote: 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? O _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org [2] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio [3] Use a conditional expression in the "filename" field of the wavefile sink, and then have a "checkbox" control to control recording. Make the expression conditional on the state of the checkbox, and if "recording" isn't checked, make the file /dev/null, otherwise make it the file you want. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org [4] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio [5] You can use the XMLRPC server that GRC provides to change any flow-graph variables you want from outside. Links: ------ [1] mailto:mleech@ripnet.com [2] mailto:Discuss-gnuradio@gnu.org [3] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio [4] mailto:Discuss-gnuradio@gnu.org [5] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
on 2012-09-27 21:12
Ok, tried with selector and check box. I started script, check box appeared, i cheched it and recording to wav file started. Wait a bit and unchecked it, got file 2.7 Mbytes, not growing more, then stopped the script. FIle is corrupted. Here is links on my grc scheme - http://db.tt/ACl4nLNy and wav file i got - http://db.tt/87PIVwCy Any help will be appreciated, i dont believe wav sink is so buggy....
on 2012-09-27 23:48
> Ok, tried with selector and check box. > I started script, check box appeared, i cheched it and recording to > wav file started. > Wait a bit and unchecked it, got file 2.7 Mbytes, not growing more, > then stopped the script. > FIle is corrupted. > > > Looked at your flow-graph. You have to make the *filename* on the WAV sink change depending on recording/not-recording. Just use a conditional expression as the filename parameter in the filename sink "myfile" if recording_on else "/dev/null" -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org
on 2012-09-28 06:55
ok! with conditional filename works like a charm! thank you very much! sorry that i did get for the first time ;-)
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