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Re: Audio Function Problem

From: Thomas D. Dean
Subject: Re: Audio Function Problem
Date: Fri, 13 Oct 2017 20:59:31 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0

On 10/13/17 12:16, Thomas D. Dean wrote:
I have a problem with audio functions returning values that seem strange.

getaudiodata () should return values between -1 and 1 but, does not. Seems to be a problem in handling a 24 bit source.

Tom Dean


This is a bug in Octave.  I sent a patch to Savannah.

I used the sources from octave-4.2.1.tar.gz.

This problem in in the callback function, portaudio_record_callback. The same problem exists in the function octave_record_callback.

The variables used to convert from 24 bit to 32 bit are not zero'd inside the loop. Therefore, bits in the high order byte remain, corrupting the data. Fixing portaudio_record_callback fixes my problem, but octave_record_callback should be corrected at the same time.

> diff libinterp/dldfcn/ libinterp/dldfcn/
<           for (int j = 0; j < 3; j++)
>                 // 20171013 tomdean
>                 sample_l32 = 0; sample_r32 = 0;
>                 for (int j = 0; j < 3; j++)
>                 // 20171013 tomdean
>                 sample_l32 = 0; sample_r32 = 0;

Tom Dean

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