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1.5x-2x faster encoding for method 3 and up

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using token-buffer (that is: slightly more memory. O(output_size))

This change is ON by default. To return to previous behaviour, use
'cwebp -low_memory' or set config.low_memory to true.

Side-effect of this new mode: it forces 1 partition only (which was
default anyway), and makes some statistics about the bitstream
no longer available. cwebp will no longer report 'intra4-coeffs', etc.

This mode also doesn't work (yet) with multi-pass, and -low_memory
is currently forced for multi-pass.

also: reversed the flag: USE_TOKEN_BUFFER -> DISABLE_TOKEN_BUFFER
also: fixed the kAverageBytesPerMB estimate

Change-Id: I4ea80382038d6df4309663e0cb7bd88d9bca9cf1
This commit is contained in:
skal
2013-03-12 00:37:42 +01:00
committed by James Zern
parent be2fd1735a
commit 9bfbdd144f
10 changed files with 346 additions and 184 deletions
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28
src/enc/webpenc.c
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@ -109,14 +109,17 @@ static void ResetBoundaryPredictions(VP8Encoder* const enc) {
//-------------------+---+---+---+---+---+---+---+
// rd-opt i4/16 | | | ~ | x | x | x | x |
//-------------------+---+---+---+---+---+---+---+
// token buffer (opt)| | | | x | x | x | x |
//-------------------+---+---+---+---+---+---+---+
// Trellis | | | | | | x |Ful|
//-------------------+---+---+---+---+---+---+---+
// full-SNS | | | | | x | x | x |
//-------------------+---+---+---+---+---+---+---+
static void MapConfigToTools(VP8Encoder* const enc) {
const int method = enc->config_->method;
const int limit = 100 - enc->config_->partition_limit;
const WebPConfig* const config = enc->config_;
const int method = config->method;
const int limit = 100 - config->partition_limit;
enc->method_ = method;
enc->rd_opt_level_ = (method >= 6) ? RD_OPT_TRELLIS_ALL
: (method >= 5) ? RD_OPT_TRELLIS
@ -126,7 +129,17 @@ static void MapConfigToTools(VP8Encoder* const enc) {
256 * 16 * 16 * // upper bound: up to 16bit per 4x4 block
(limit * limit) / (100 * 100); // ... modulated with a quadratic curve.
enc->thread_level_ = enc->config_->thread_level;
enc->thread_level_ = config->thread_level;
enc->do_search_ = (config->target_size > 0 || config->target_PSNR > 0);
if (!config->low_memory) {
#if !defined(DISABLE_TOKEN_BUFFER)
enc->use_tokens_ = (method >= 3) && !enc->do_search_;
#endif
if (enc->use_tokens_) {
enc->num_parts_ = 1; // doesn't work with multi-partition
}
}
}
// Memory scaling with dimensions:
@ -265,6 +278,7 @@ static VP8Encoder* InitVP8Encoder(const WebPConfig* const config,
VP8EncInitLayer(enc);
#endif
VP8TBufferInit(&enc->tokens_);
return enc;
}
@ -275,6 +289,7 @@ static int DeleteVP8Encoder(VP8Encoder* enc) {
#ifdef WEBP_EXPERIMENTAL_FEATURES
VP8EncDeleteLayer(enc);
#endif
VP8TBufferClear(&enc->tokens_);
free(enc);
}
return ok;
@ -373,11 +388,16 @@ int WebPEncode(const WebPConfig* config, WebPPicture* pic) {
// Analysis is done, proceed to actual coding.
ok = ok && VP8EncStartAlpha(enc); // possibly done in parallel
ok = ok && VP8StatLoop(enc) && VP8EncLoop(enc);
if (!enc->use_tokens_) {
ok = VP8EncLoop(enc);
} else {
ok = VP8EncTokenLoop(enc);
}
ok = ok && VP8EncFinishAlpha(enc);
#ifdef WEBP_EXPERIMENTAL_FEATURES
ok = ok && VP8EncFinishLayer(enc);
#endif
ok = ok && VP8EncWrite(enc);
StoreStats(enc);
if (!ok) {