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Optimize cache estimate logic.

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Optimize 'VP8LCalculateEstimateForCacheSize' for lower quality ranges (Q < 50).
The entropy is generally lower for higher cache_bits, so start searching from
higher cache_bits and settle for a local minima, instead of evaluating all
values.

This speeds up the lossless encoding at lower qualities by 10-15%.

Change-Id: I33c1e958515a2549f2e6f64b1aab3f128660dcec
This commit is contained in:
Vikas Arora
2014-02-11 10:38:47 -08:00
parent 7fb6095b03
commit a7d2ee39be
3 changed files with 31 additions and 23 deletions
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3
src/enc/vp8l.c
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@ -1042,7 +1042,8 @@ WebPEncodingError VP8LEncodeStream(const WebPConfig* const config,
if (enc->cache_bits_ > 0) {
if (!VP8LCalculateEstimateForCacheSize(enc->argb_, enc->current_width_,
height, &enc->cache_bits_)) {
height, quality,
&enc->cache_bits_)) {
err = VP8_ENC_ERROR_INVALID_CONFIGURATION;
goto Error;
}