[mpg123-devel] [ mpg123-Bugs-3390838 ] Distorted Sound for MSVC x86 Build

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Bugs item #3390838, was opened at 2011-08-13 05:25
Message generated for change (Comment added) made by nobody
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Category: mpg123
Group: 1.13.3
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: Distorted Sound for MSVC x86 Build

Initial Comment:
When building mpg123 through the Visual Studio 2008 project configurations under ports/msvc++/2008, I hear distorted sound and random noise during simple playback if I build with the `Release_x86_Dll' configuration. This issue does not occur If I build with the `Release_Generic_Dll' configurations, which does not use Yasm.

My testing environment:

Intel Core i7 Q720
Windows 7 Pro 64-bit
Microsoft Visual C++ 2008 or 2010, tried both and had the same problem
Yasm 1.1.0 Windows 32-bit or 64-bit binaries, tried both and had the same problem

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Comment By: Nobody/Anonymous (nobody)
Date: 2011-09-22 00:50

Message:
I can reproduce the problem too. Windows 7, VS2010, Yasm 1.1.0 32bit,
compiled using x86 dll release build. tne ENC_FLOAT_32 format is
unaffected, ENC_SIGNED_16 is affected.

Cheers,
Milan Straka

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Comment By: Su Zhang (s68zhang)
Date: 2011-09-07 23:10

Message:
Hi patr3ck,

I tried the feedseek testing code. It seems that the issue does not occur
when the output format is MPG123_ENC_FLOAT_32. I tried changing the
following line in feedseek.c:

		ret = mpg123_format(m, rates[i], MPG123_MONO | MPG123_STEREO,
MPG123_ENC_FLOAT_32);

to:

		ret = mpg123_format(m, rates[i], MPG123_MONO | MPG123_STEREO,
MPG123_ENC_SIGNED_16);

then I reproduced the problem. I will upload a sample file if you need
one. Thank you very much for looking into this.

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Comment By: Patr3ck (patr3ck)
Date: 2011-09-07 21:43

Message:
Using the feedseek testing code I successfully decoded mp3 using VS2010
with Yasm 1.1.0 32bit, compiled using the x86 dll release build.

Can you try if the feedseek testing code works for you? It is part of the
VS2010 solution and will decode to a wav file.

Patrick


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Comment By: MeikeTalbach (meiketalbach)
Date: 2011-08-29 14:41

Message:
I have this problem too and it is very annoying (VS2010, XP, YASM 1.1.0,
X86).
Could work around by disabling all optimized decoders (MMX, 3DNOW,
3DNOWEXT, SSE) and falling back to the not-optimized ones (GENERIC, I386,
I586).

Whenever I play an MP3 file, it starts with a "bing" sound. I decompressed
an MP3 to WAV and analyzed it with Adobe Audition. The waveform has an
overlay that looks like stairways.

I can provide sample file if required.

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