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by-pass Analysis pass in case segments=1

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10-15% faster encoding.

Almost same output, binary wise. The main difference is
that we can't compute uv_alpha susceptibility, means there
can be subtle differences with different -sns values.

Change-Id: Id1b1a50929bf125b6372212fee1ed75a3bed975f
This commit is contained in:
Pascal Massimino 2012-11-06 22:53:13 -08:00
parent d2ad4450ce
commit d9c5fbefa4
1 changed files with 35 additions and 13 deletions
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24
src/enc/analysis.c
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@ -344,6 +344,14 @@ static void MBAnalyze(VP8EncIterator* const it,
it->mb_->alpha_ = best_alpha; // for later remapping.
}
static void DefaultMBInfo(VP8MBInfo* const mb) {
mb->type_ = 1; // I16x16
mb->uv_mode_ = 0;
mb->skip_ = 0; // not skipped
mb->segment_ = 0; // default segment
mb->alpha_ = 0;
}
//------------------------------------------------------------------------------
// Main analysis loop:
// Collect all susceptibilities for each macroblock and record their
@ -356,6 +364,10 @@ static void MBAnalyze(VP8EncIterator* const it,
int VP8EncAnalyze(VP8Encoder* const enc) {
int ok = 1;
const int do_segments =
(enc->segment_hdr_.num_segments_ > 1) ||
(enc->method_ <= 2); // for methods 0,1,2, we need preds_[] to be filled.
if (do_segments) {
int alphas[MAX_ALPHA + 1] = { 0 };
VP8EncIterator it;
@ -369,7 +381,17 @@ int VP8EncAnalyze(VP8Encoder* const enc) {
} while (ok && VP8IteratorNext(&it, it.yuv_in_));
enc->uv_alpha_ /= enc->mb_w_ * enc->mb_h_;
if (ok) AssignSegments(enc, alphas);
} else { // Use only one default segment.
int n;
for (n = 0; n < enc->mb_w_ * enc->mb_h_; ++n) {
DefaultMBInfo(&enc->mb_info_[n]);
}
// Default susceptibilities.
enc->dqm_[0].alpha_ = 0;
enc->dqm_[0].beta_ = 0;
enc->uv_alpha_ = 0; // we can't compute this one.
WebPReportProgress(enc->pic_, enc->percent_ + 20, &enc->percent_);
}
return ok;
}