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use 16bit counters for recording proba counts

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This proved being ok, even for large pictures, provided one
takes care of overflow. When an overflow is bound to occur, the
counters are renormalized.
Overall, shaves ~12k of memory.

Change-Id: I2ba21a407964fe1a34c352371cba15166e0c4548
This commit is contained in:
Pascal Massimino
2012-01-23 17:50:58 -08:00
parent 7f23678da0
commit 0de3096b3a
3 changed files with 46 additions and 36 deletions
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5
src/enc/vp8enci.h
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@ -165,8 +165,9 @@ extern const uint8_t VP8Zigzag[16];
//------------------------------------------------------------------------------
// Headers
typedef uint32_t proba_t; // 16b + 16b
typedef uint8_t ProbaArray[NUM_CTX][NUM_PROBAS];
typedef uint64_t StatsArray[NUM_CTX][NUM_PROBAS][2];
typedef proba_t StatsArray[NUM_CTX][NUM_PROBAS];
typedef uint16_t CostArray[NUM_CTX][MAX_VARIABLE_LEVEL + 1];
typedef double LFStats[NUM_MB_SEGMENTS][MAX_LF_LEVELS]; // filter stats
@ -185,7 +186,7 @@ typedef struct {
uint8_t segments_[3]; // probabilities for segment tree
uint8_t skip_proba_; // final probability of being skipped.
ProbaArray coeffs_[NUM_TYPES][NUM_BANDS]; // 924 bytes
StatsArray stats_[NUM_TYPES][NUM_BANDS]; // 7.4k
StatsArray stats_[NUM_TYPES][NUM_BANDS]; // 4224 bytes
CostArray level_cost_[NUM_TYPES][NUM_BANDS]; // 11.4k
int use_skip_proba_; // Note: we always use skip_proba for now.
int nb_skip_; // number of skipped blocks