[gstreamer-bugs] [Bug 592787] a52dec: Allow liba52 to use djbfft based IMDCT transform

[GStreamer (bugzilla.gnome.org)]

http://bugzilla.gnome.org/show_bug.cgi?id=592787


Sebastian Dröge <slomo> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |slomo at circular-chaos.org
         Resolution|                            |FIXED
   Target Milestone|HEAD                        |0.10.13


--- Comment #3 from Sebastian Dröge <slomo at circular-chaos.org> 2009-08-23 11:37:41 UTC ---
commit f5f10797ffa7d63c9dc5b086ce4e788c528c922c
Author: Sebastian Dröge <sebastian.droege at collabora.co.uk>
Date:   Sun Aug 23 13:35:46 2009 +0200

    a52dec: Only add the MM_ACCEL_DJBFFT flag if it's defined

    It's not defined for older liba52 versions.

commit ebfe6c07467c67c82cdd199903ddd36097564ed5
Author: Mart Raudsepp <leio at gentoo.org>
Date:   Sun Aug 23 13:34:32 2009 +0200

    a52dec: Allow liba52 to use djbfft based IMDCT transform

    liba52 in a52dec-0.7.4 does not have any MMX, MMXEXT or 3DNOW based
    IMDCT transform acceleration. It does however have a software based
    acceleration using the djbfft library (D.J. Bernstein's library for
    fourier transforms - Extremely fast library for floating-point
    convolution). So allow liba52 to use it through the MM_ACCEL_DJBFFT
    flag.
    The liba52 copy in MPlayer sources does have SSE, 3dnowext, 3dnow
    and AltiVec implementations, but those are checked for first, and
    djbfft is chosen only if none of those is available - good in the
    case of some distributions including a port of the MPlayer changes
    in their system a52dec library.

    The down and upmix code in liba52 doesn't seem to be disturbed by
    this additional MM_ACCEL flag and will still use MMX, SSE or 3DNOW
    versions if passed from oil_cpu_get_flags (SSE currently is not).

    Fixes bug #592787.

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