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• Revision 455f2de20b : Tune tokenization/detokenization flow for speed-up This commit optimizes the to

  30 juillet 2013, par Jingning Han

  Changed Paths :
   Modify /vp9/decoder/vp9_detokenize.c

  
   Modify /vp9/encoder/vp9_tokenize.c

  
  
  Tune tokenization/detokenization flow for speed-up

  This commit optimizes the tokenization and detokenization operational
  flow for speed-up. It makes the coding process about 0.3% faster at
  speed 0.

  Change-Id : I28008df7482874e4b5f237f2d418ff82a249dd56

• Revision 56df76bf1b : Merge "Optimize 32x32 2D inverse DCT for speed-up"

  1er août 2013, par Jingning Han

  Merge "Optimize 32x32 2D inverse DCT for speed-up"

• Revision 9d67495f72 : Optimize 32x32 2D inverse DCT for speed-up This commit exploits the sparsity of

  1er août 2013, par Jingning Han

  Changed Paths :
   Modify /vp9/common/x86/vp9_idct_intrin_sse2.c

  
  
  Optimize 32x32 2D inverse DCT for speed-up

  This commit exploits the sparsity of quantized coefficient matrix.
  It detects each 32x8 array and skip the corresponding inverse
  transformation if all entries are zero.

  For ped1080p at 8000 kbps, this on average reduces the runtime of
  32x32 inverse 2D-DCT SSE2 function from 6256 cycles -> 5200
  cycles. It makes the overall encoding process about 2% faster at
  speed 0. The speed-up is more pronounceable for the decoding process.

  Change-Id : If20056c3566bd117642a76f8884c83e8bc8efbcf