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

[GStreamer (bugzilla.gnome.org)]

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

           Summary: a52dec: Allow liba52 to use djbfft based IMDCT
                    transform
    Classification: Desktop
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: minor
          Priority: Normal
         Component: gst-plugins-ugly
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: leio at gentoo.org
         QAContact: gstreamer-bugs at lists.sourceforge.net
      GNOME target: ---
     GNOME version: ---


--- Comment #0 from Mart Raudsepp <leio at gentoo.org> 2009-08-23 09:59:13 UTC ---
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).

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