RE: Wav source: playing speed and playing startup instant

[Jim Melton]

My apologies; wavfile_source does not inherit from file_source, so my answer does not apply.

 

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Jim Melton

 

From: Jim Melton
Sent: Monday, February 13, 2023 10:23
To: 'discuss-gnuradio@gnu.org' <discuss-gnuradio@gnu.org>
Subject: RE: [EXTERNAL] Wav source: playing speed and playing startup instant

 

I would add that “playback speed” will be determined either by upstream blocks, or a Throttle block that you add after the file.

 

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Jim Melton

 

 

From: Jim Melton
Sent: Monday, February 13, 2023 10:20
To: discuss-gnuradio@gnu.org
Subject: RE: [EXTERNAL] Wav source: playing speed and playing startup instant

 

If your question is how to subset the file, see https://wiki.gnuradio.org/index.php/File_Source Offset and Length parameters.

 

If your question is how to use a GUI slider to accomplish this, I’ll defer to others.

 

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Jim Melton

 

From: discuss-gnuradio-bounces+jim.melton=sncorp.com@gnu.org <discuss-gnuradio-bounces+jim.melton=sncorp.com@gnu.org> On Behalf Of Giovanni Parodi
Sent: Monday, February 13, 2023 06:00
To: discuss-gnuradio@gnu.org
Subject: [EXTERNAL] Wav source: playing speed and playing startup instant

 

Good morning, 

I'm a gnuradio beginner, and I'm trying to better understand some topics related to source and sink.

 

I implemented a very easy SW that allows me selecting a file from filesystem and then I provide the filename to the C++ source implementation, by calling the function:

   blocks::wavfile_source::make

 

The implementation works fine, but I have an issue.

 

Since sometimes I need to perform audio analysis on files that are quite long, I would like to have a way to use something like a timeslider to move on a specific time instant on the wav file, or at least to change playing speed of file. 

I found no property (looking both in C++ and Python generated code) to achieve this target.

Is there any way to perform this operation? 

Best regards

 

 

 

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