1. 28 Feb, 2014 2 commits
    • Christophe Gisquet's avatar
      dcadec: simplify decoding of VQ high frequencies · 4cb69642
      Christophe Gisquet authored
      The vector dequantization has a test in a loop preventing effective SIMD
      implementation. By moving it out of the loop, this loop can be DSPized.
      
      Therefore, modify the current DSP implementation. In particular, the
      DSP implementation no longer has to handle null loop sizes.
      
      The decode_hf implementations have following timings:
      
      For x86 Arrandale:
              C  SSE SSE2 SSE4
      win32: 260 162  119  104
      win64: 242 N/A   89   72
      
      The arm NEON optimizations follow in a later patch as external asm. The
      now unused check for the y modifier in arm inline asm is removed from
      configure.
      4cb69642
    • Christophe Gisquet's avatar
      dcadec: remove scaling in lfe_interpolation_fir · 87ec849f
      Christophe Gisquet authored
      The scaling factor is constant so it is faster to scale the
      FIR coefficients in the tables during compilation.
      Signed-off-by: 's avatarJanne Grunau <janne-libav@jannau.net>
      87ec849f
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