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Fast computation path for forward transform and quantization

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This commit enables a fast path computational flow for forward
transformation. It checks the sse and variance of prediction
residuals and decides if the quantized coefficients are all
zero, dc only, or more. It then selects the corresponding coding
path in the forward transformation and quantization stage.

It is currently enabled in rtc coding mode. Will do it for rd
coding mode next.

In speed -6, the runtime for pedestrian_area 1080p at 1000 kbps
goes down from 14234 ms to 13704 ms, i.e., about 4% speed-up.
Overall coding performance for rtc set is changed by -0.18%.

Change-Id: I0452da1786d59bc8bcbe0a35fdae9f623d1d44e1
This commit is contained in:
Jingning Han
2014-05-29 18:14:17 -07:00
parent 5556d11841
commit ccba289f8d
11 changed files with 421 additions and 8 deletions
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vp9/encoder/vp9_context_tree.h
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@@ -33,6 +33,7 @@ typedef struct {
int is_coded;
int num_4x4_blk;
int skip;
int skip_txfm;
int best_mode_index;
int hybrid_pred_diff;
int comp_pred_diff;