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Improve accuracy of rate control in CQ mode

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Modifies a special handling that improves rate control accuracy in
the constrained quality mode, when the undershoot and overshoot
limits are set tighter.

Change-Id: If62103f0ef3ed1cac92807400678c93da50cf046
This commit is contained in:
Debargha Mukherjee
2015-04-07 16:15:11 -07:00
parent 5eee2a88f8
commit 60bd744c88
1 changed files with 2 additions and 1 deletions
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3
vp9/encoder/vp9_firstpass.c
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@@ -2612,6 +2612,7 @@ void vp9_rc_get_second_pass_params(VP9_COMP *cpi) {
}
#define MINQ_ADJ_LIMIT 48
#define MINQ_ADJ_LIMIT_CQ 20
void vp9_twopass_postencode_update(VP9_COMP *cpi) {
TWO_PASS *const twopass = &cpi->twopass;
RATE_CONTROL *const rc = &cpi->rc;
@@ -2651,7 +2652,7 @@ void vp9_twopass_postencode_update(VP9_COMP *cpi) {
const int maxq_adj_limit =
rc->worst_quality - twopass->active_worst_quality;
const int minq_adj_limit =
(cpi->oxcf.rc_mode == VPX_CQ) ? 0 : MINQ_ADJ_LIMIT;
(cpi->oxcf.rc_mode == VPX_CQ ? MINQ_ADJ_LIMIT_CQ : MINQ_ADJ_LIMIT);
// Undershoot.
if (rc->rate_error_estimate > cpi->oxcf.under_shoot_pct) {