Re: [Discuss-gnuradio] wav file source question

[Chris Kuethe]

Here's an example that generates a wave file that is playable by both
gnuradio and mplayer

On Tue, Jun 9, 2015 at 2:49 PM, Fernando <address@hidden> wrote:
> You can address me by Fernando, it's easier to pronounce  ;-)
> I'm trying to save audio from the audio source to a file or from a signal
> source 1Khz for instance.
> I've tryed different things, and different data rate (I've tried 44100 also)
> and is always the same eror
>
> Generating: "/home/ubuntu/top_block.py"
>
> Executing: "/home/ubuntu/top_block.py"
>
> Traceback (most recent call last):
>   File "/home/ubuntu/top_block.py", line 51, in <module>
>     tb = top_block()
>   File "/home/ubuntu/top_block.py", line 33, in __init__
>     self.blocks_wavfile_source_0 =
>  blocks.wavfile_source("/home/ubuntu/prueba.wav", True)
>   File
>  "/usr/local/lib/python2.7/dist-packages/gnuradio/blocks/blocks_swig0.py",
>  line 1418, in make
>     return _blocks_swig0.wavfile_source_make(*args, **kwargs)
> RuntimeError: WAV file does not contain any samples
>
>>>> Done
>
>
> But i have converted a mp3 file to wav with mpg123 and the file plays well
> using wav file source.
> Moreover: i've converted a file with mpg123 to a wav file at 22Ksps and it
> works too.
> And The file wav generated in gnuradio with wav file source is a valid wav
> file which I can play with amarok.
> So the problem is that wav file source does not recognice the files created
> by wav file sink altough they seem to be fully valid files.
>
>
> regards
>
>
>
>
>
>
>
>
>
>
> Marcus Müller-3 wrote
>> Hi fffdddoo (is that really the name by which we should address you?),
>>
>> I'm guessing you try to save audio directly from the audio source to a
>> wav file, right?
>>
>> So, my blind guess is that Baokum wrongly configured the audio source
>> and simply nothing came out of it.
>> For example, no soundcard normally uses a sampling rate of 32kHz. A
>> typical rate is 44.1kHz.
>>
>> You might want to check your console output for errors. Most of the
>> time, the audio sink complains about things like the device name not
>> working or something else going wrong; this all depends very much on
>> which operating system you use GNU Radio.
>> Do you get any errors?
>>
>> Of course, when using a file_sink you don't generate a wav file, that's
>> why we have the WAV sink :)
>>
>> Best regards,
>> Marcus
>>
>> On 06/09/2015 09:34 PM, fffdddooo wrote:
>>> Well. I read the workaround. The problem is if you use file source and
>>> file
>>> sink instead of wav file source and wav file sink, you are not generating
>>> a
>>> wav file. You can name it *.wav, but it isn't a wav file at all.
>>> What I want to do is generating a wav file wich can be playd with any wav
>>> player (that I can do with wav file sink) and been able to use it again
>>> in
>>> gnu radio (wich does not work with file wav file source).
>>> I've tried 8 and 16 bits and different data rate
>>>
>>>
>>>
>>>
>>>
>>> Marcus Müller-3 wrote
>>>> Hi fffdddooo,
>>>>
>>>> Baokum Liu asked that two years ago. Some things have changed since
>>>> then; do you have a question that we might help you answer?
>>>>
>>>> Best regards,
>>>> Marcus
>>>>
>>>> On 06/09/2015 08:46 PM, fffdddooo wrote:
>>>>> Did you find the solution?
>>>>>
>>>>> regards
>>>>>
>>>>> Baokun Liu wrote
>>>>>> Hi guys,
>>>>>>
>>>>>> I am playing with gnuradio companion. I have a question on wav file.
>>>>>>
>>>>>> I play like this first (the samp_rate set to 32k)
>>>>>>
>>>>>> *Audio Source ---> Wav File Sink;*
>>>>>>
>>>>>> I save the file as test.wav. It sound well.
>>>>>>
>>>>>> Then, I play the file back (samp_rate is 32k).
>>>>>>
>>>>>> *Wave File Source ---> Audio Sink; *
>>>>>>
>>>>>> The error comes as: WAV file does not contain any samples.
>>>>>>
>>>>>> Could anyone point out the problem? How could I use the 'wav file
>>>>>> source'
>>>>>> block?
>>>>>>
>>>>>> Thanks,
>>>>>>
>>>>>> Baokun
>>>>>>
>>>>>> _______________________________________________
>>>>>> Discuss-gnuradio mailing list
>>>>>> Discuss-gnuradio@
>>>>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> View this message in context:
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>>>>>
>>>>> _______________________________________________
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>>>>>
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-- 
GDB has a 'break' feature; why doesn't it have 'fix' too?

wav_generator.py
Description: Text Data

wav_playback.py
Description: Text Data

wavfile.grc
Description: Binary data