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Special-case sparse transform

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If the number of non-zero coeffs is <= 3, use a
simplified transform for luma.

Change-Id: I78a1252704228d21720d4bc1221252c84338d9c8
This commit is contained in:
skal
2013-10-08 22:05:38 +02:00
parent 00125196f3
commit f9bbc2a034
6 changed files with 159 additions and 72 deletions
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15
src/dec/vp8i.h
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@ -184,12 +184,15 @@ typedef struct {
uint8_t is_i4x4_; // true if intra4x4
uint8_t imodes_[16]; // one 16x16 mode (#0) or sixteen 4x4 modes
uint8_t uvmode_; // chroma prediction mode
// bit-wise info about the content of each sub-4x4 blocks: there are 16 bits
// for luma (bits #15->#0), then 4 bits for chroma-u (#19->#16) and 4 bits for
// chroma-v (#23->#20), each corresponding to one 4x4 block in decoding order.
// If the bit is set, the 4x4 block contains some non-zero coefficients.
uint32_t non_zero_;
uint32_t non_zero_ac_;
// bit-wise info about the content of each sub-4x4 blocks (in decoding order).
// Each of the 4x4 blocks for y/u/v is associated with a 2b code according to:
// code=0 -> no coefficient
// code=1 -> only DC
// code=2 -> first three coefficients are non-zero
// code=3 -> more than three coefficients are non-zero
// This allows to call specialized transform functions.
uint32_t non_zero_y_;
uint32_t non_zero_uv_;
} VP8MBData;
// Persistent information needed by the parallel processing