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decoding speed-up (~1%)

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- precompute filtering strength once for all at the beginning
  instead of per-macroblock
- reduce size of VP8MB struct from 8 bytes to 4.
- removed VP8StoreBlock() accordingly

Change-Id: Icf3d329473e21c464770be3d72a04c9ee4c321f2
This commit is contained in:
Pascal Massimino
2012-12-14 10:22:54 -08:00
parent bcec339b01
commit 0f57dcc31f
4 changed files with 68 additions and 69 deletions
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10
src/dec/vp8i.h
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@ -157,7 +157,7 @@ typedef struct { // filter specs
} VP8FInfo;
typedef struct { // used for syntax-parsing
unsigned int nz_; // non-zero AC/DC coeffs
unsigned int nz_:24; // non-zero AC/DC coeffs (24bit)
unsigned int dc_nz_:1; // non-zero DC coeffs
unsigned int skip_:1; // block type
} VP8MB;
@ -269,9 +269,9 @@ struct VP8Decoder {
uint32_t non_zero_ac_;
// Filtering side-info
int filter_type_; // 0=off, 1=simple, 2=complex
int filter_row_; // per-row flag
uint8_t filter_levels_[NUM_MB_SEGMENTS]; // precalculated per-segment
int filter_type_; // 0=off, 1=simple, 2=complex
int filter_row_; // per-row flag
VP8FInfo fstrengths_[NUM_MB_SEGMENTS][2]; // precalculated per-segment/type
// extensions
const uint8_t* alpha_data_; // compressed alpha data (if present)
@ -312,8 +312,6 @@ VP8StatusCode VP8EnterCritical(VP8Decoder* const dec, VP8Io* const io);
int VP8ExitCritical(VP8Decoder* const dec, VP8Io* const io);
// Process the last decoded row (filtering + output)
int VP8ProcessRow(VP8Decoder* const dec, VP8Io* const io);
// Store a block, along with filtering params
void VP8StoreBlock(VP8Decoder* const dec);
// To be called at the start of a new scanline, to initialize predictors.
void VP8InitScanline(VP8Decoder* const dec);
// Decode one macroblock. Returns false if there is not enough data.