Bad audio quality (possibly in resampling) in Linux (thanks Thomas Kluge for the report)

[bennylp]

task: resample from 44.1KHz to 8KHz

cmdline: ./pjsua --null-audio --clock-rate 8000 --play-file nanotech44.wav --rec-file output8.wav

The results:

• Vista, VS6: ok
• Vista, Mingw/gcc-3.4.5: ok
• Linux1, gcc-4.3.2: bad
• Linux2, gcc-4.1.1: bad

I'm somehow still 100% convinced that this is Linux thing, as I don't suppose there's any platform specific processing there. It could also be something specific to gcc 4. If someone has gcc 3, on Linux, to test this with, that will be great.

The corresponding ticket for the 1.0 branch is #767

[bennylp]

Linux with gcc-3.4.x was reported to be okay:

[root@webhost bin]# gcc -v
Reading specs from /usr/lib/gcc/i386-redhat-linux/3.4.6/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --disable-checking --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-java-awt=gtk --host=i386-redhat-linux
Thread model: posix
gcc version 3.4.6 20060404 (Red Hat 3.4.6-10)

[nanang]

Just tried on Ubuntu 8.04 with gcc-4.2.3, audio is fine.

[nanang]

Again, tried on MacOSX 10.5.2 with gcc-4.0.2, audio is fine.

[nanang]

Linux x86 64bit with gcc 4.2.4 reported to be ok:

$ gcc -v
Using built-in specs.
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --enable-languages=c,c++,fortran,objc,obj-c++,treelang --prefix=/usr --enable-shared --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --enable-nls --with-gxx-include-dir=/usr/include/c++/4.2 --program-suffix=-4.2 --enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc --enable-mpfr --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.2.4 (Ubuntu 4.2.4-1ubuntu3)

[nanang]

In r3085:

• Applied patch provided by Bram Kuijvenhoven related to truncation issue in floating-point to integer type-casts in pjmedia components (thanks!).
• Original patch proposal and description can be found ​here.