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BitTrace: if BITTRACE is > 0, record and print syntax bits used

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* Bittrace decoding is ~3x slower.
* Binary is the same byte-wise if BITTRACE=0
* Example output:
=== Bit traces ===
global-header    :    174 bytes   	[ 0.69%] [count:    1850]
segments         :    246 bytes   	[ 0.98%] [count:    3072]
block-size       :    170 bytes   	[ 0.68%] [count:    1536]
pred-modes       :   3829 bytes   	[15.27%] [count:   51458]
pred-modes-uv    :    279 bytes   	[ 1.11%] [count:    2329]
coeffs           :  20370 bytes   	[81.27%] [count:  212914]
Total: 25065 bytes

Change-Id: Ie32569c4e54a7ec13264e68d2dae2ce45c8536cb
This commit is contained in:
Pascal Massimino
2019-03-12 09:48:37 +01:00
parent 067031eaed
commit fcfd9c71b4
7 changed files with 203 additions and 86 deletions
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11
src/utils/bit_reader_inl_utils.h
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@ -104,7 +104,8 @@ void VP8LoadNewBytes(VP8BitReader* const br) {
}
// Read a bit with proba 'prob'. Speed-critical function!
static WEBP_INLINE int VP8GetBit(VP8BitReader* const br, int prob) {
static WEBP_INLINE int VP8GetBit(VP8BitReader* const br,
int prob, const char label[]) {
// Don't move this declaration! It makes a big speed difference to store
// 'range' *before* calling VP8LoadNewBytes(), even if this function doesn't
// alter br->range_ value.
@ -129,13 +130,14 @@ static WEBP_INLINE int VP8GetBit(VP8BitReader* const br, int prob) {
br->bits_ -= shift;
}
br->range_ = range - 1;
BT_TRACK(br);
return bit;
}
}
// simplified version of VP8GetBit() for prob=0x80 (note shift is always 1 here)
static WEBP_UBSAN_IGNORE_UNSIGNED_OVERFLOW WEBP_INLINE
int VP8GetSigned(VP8BitReader* const br, int v) {
int VP8GetSigned(VP8BitReader* const br, int v, const char label[]) {
if (br->bits_ < 0) {
VP8LoadNewBytes(br);
}
@ -148,11 +150,13 @@ int VP8GetSigned(VP8BitReader* const br, int v) {
br->range_ += mask;
br->range_ |= 1;
br->value_ -= (bit_t)((split + 1) & mask) << pos;
BT_TRACK(br);
return (v ^ mask) - mask;
}
}
static WEBP_INLINE int VP8GetBitAlt(VP8BitReader* const br, int prob) {
static WEBP_INLINE int VP8GetBitAlt(VP8BitReader* const br,
int prob, const char label[]) {
// Don't move this declaration! It makes a big speed difference to store
// 'range' *before* calling VP8LoadNewBytes(), even if this function doesn't
// alter br->range_ value.
@ -179,6 +183,7 @@ static WEBP_INLINE int VP8GetBitAlt(VP8BitReader* const br, int prob) {
br->bits_ -= shift;
}
br->range_ = range;
BT_TRACK(br);
return bit;
}
}