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Rework partition search skip scheme

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This commit enables the encoder to skip split partition search if
the bigger block size has all non-zero quantized coefficients in low
frequency area and the total rate cost is below a certain threshold.
It logarithmatically scales the rate threshold according to the
current block size. For speed 3, the compression performance loss:
derf  -0.093%
stdhd -0.066%

Local experiments show 4% - 20% encoding speed-up for speed 3.
blue_sky_1080p, 1500 kbps
51051 b/f, 35.891 dB, 67236 ms ->
50554 b/f, 35.857 dB, 59270 ms (12% speed-up)

old_town_cross_720p, 1500 kbps
14431 b/f, 36.249 dB, 57687 ms ->
14108 b/f, 36.172 dB, 46586 ms (19% speed-up)

pedestrian_area_1080p, 1500 kbps
50812 b/f, 40.124 dB, 100439 ms ->
50755 b/f, 40.118 dB,  96549 ms (4% speed-up)

mobile_calendar_720p, 1000 kbps
10352 b/f, 35.055 dB, 51837 ms ->
10172 b/f, 35.003 dB, 44076 ms (15% speed-up)

Change-Id: I412e34db49060775b3b89ba1738522317c3239c8
This commit is contained in:
Jingning Han
2014-10-02 17:49:00 -07:00
parent ba172ff0a5
commit bb260d9076
5 changed files with 36 additions and 10 deletions
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8
vp9/encoder/vp9_rdopt.c
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@@ -1948,11 +1948,17 @@ static void store_coding_context(MACROBLOCK *x, PICK_MODE_CONTEXT *ctx,
int64_t best_filter_diff[SWITCHABLE_FILTER_CONTEXTS],
int skippable) {
MACROBLOCKD *const xd = &x->e_mbd;
int plane, has_high_freq_coeff = 0;
BLOCK_SIZE bsize = xd->mi[0].src_mi->mbmi.sb_type;
if (bsize >= BLOCK_8X8)
for (plane = 0; plane < MAX_MB_PLANE; ++plane)
has_high_freq_coeff |= vp9_has_high_freq_in_plane(x, bsize, plane);
// Take a snapshot of the coding context so it can be
// restored if we decide to encode this way
ctx->skip = x->skip;
ctx->skippable = skippable;
ctx->skippable = skippable || !has_high_freq_coeff;
ctx->best_mode_index = mode_index;
ctx->mic = *xd->mi[0].src_mi;
ctx->single_pred_diff = (int)comp_pred_diff[SINGLE_REFERENCE];