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Change to update of rate control factors.

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Remove damping parameter and use the damping
formula introduced by Yaowu Xu in all cases.

Change-Id: I18db7e0d0f262d5140102f259ab07821d374d285
This commit is contained in:
Paul Wilkins
2015-01-26 18:17:14 -08:00
parent c29c613400
commit f752da8ce2
3 changed files with 11 additions and 24 deletions
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12
vp9/encoder/vp9_encoder.c
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@@ -2955,18 +2955,18 @@ static void encode_with_recode_loop(VP9_COMP *cpi,
if (undershoot_seen || loop_count > 1) {
// Update rate_correction_factor unless
vp9_rc_update_rate_correction_factors(cpi, 1);
vp9_rc_update_rate_correction_factors(cpi);
q = (q_high + q_low + 1) / 2;
} else {
// Update rate_correction_factor unless
vp9_rc_update_rate_correction_factors(cpi, 0);
vp9_rc_update_rate_correction_factors(cpi);
q = vp9_rc_regulate_q(cpi, rc->this_frame_target,
bottom_index, MAX(q_high, top_index));
while (q < q_low && retries < 10) {
vp9_rc_update_rate_correction_factors(cpi, 0);
vp9_rc_update_rate_correction_factors(cpi);
q = vp9_rc_regulate_q(cpi, rc->this_frame_target,
bottom_index, MAX(q_high, top_index));
retries++;
@@ -2979,10 +2979,10 @@ static void encode_with_recode_loop(VP9_COMP *cpi,
q_high = q > q_low ? q - 1 : q_low;
if (overshoot_seen || loop_count > 1) {
vp9_rc_update_rate_correction_factors(cpi, 1);
vp9_rc_update_rate_correction_factors(cpi);
q = (q_high + q_low) / 2;
} else {
vp9_rc_update_rate_correction_factors(cpi, 0);
vp9_rc_update_rate_correction_factors(cpi);
q = vp9_rc_regulate_q(cpi, rc->this_frame_target,
bottom_index, top_index);
// Special case reset for qlow for constrained quality.
@@ -2995,7 +2995,7 @@ static void encode_with_recode_loop(VP9_COMP *cpi,
}
while (q > q_high && retries < 10) {
vp9_rc_update_rate_correction_factors(cpi, 0);
vp9_rc_update_rate_correction_factors(cpi);
q = vp9_rc_regulate_q(cpi, rc->this_frame_target,
bottom_index, top_index);
retries++;

21
vp9/encoder/vp9_ratectrl.c
View File

@@ -396,7 +396,7 @@ static void set_rate_correction_factor(VP9_COMP *cpi, double factor) {
}
}
void vp9_rc_update_rate_correction_factors(VP9_COMP *cpi, int damp_var) {
void vp9_rc_update_rate_correction_factors(VP9_COMP *cpi) {
const VP9_COMMON *const cm = &cpi->common;
int correction_factor = 100;
double rate_correction_factor = get_rate_correction_factor(cpi);
@@ -431,19 +431,8 @@ void vp9_rc_update_rate_correction_factors(VP9_COMP *cpi, int damp_var) {
// More heavily damped adjustment used if we have been oscillating either side
// of target.
switch (damp_var) {
case 0:
adjustment_limit = 0.75;
break;
case 1:
adjustment_limit = 0.25 +
0.5 * MIN(1, fabs(log10(0.01 * correction_factor)));
break;
case 2:
default:
adjustment_limit = 0.25;
break;
}
adjustment_limit = 0.25 +
0.5 * MIN(1, fabs(log10(0.01 * correction_factor)));
cpi->rc.q_2_frame = cpi->rc.q_1_frame;
cpi->rc.q_1_frame = cm->base_qindex;
@@ -1222,9 +1211,7 @@ void vp9_rc_postencode_update(VP9_COMP *cpi, uint64_t bytes_used) {
rc->projected_frame_size = (int)(bytes_used << 3);
// Post encode loop adjustment of Q prediction.
vp9_rc_update_rate_correction_factors(
cpi, (cpi->sf.recode_loop >= ALLOW_RECODE_KFARFGF) ? 2 :
((oxcf->rc_mode == VPX_CBR) ? 1 : 0));
vp9_rc_update_rate_correction_factors(cpi);
// Keep a record of last Q and ambient average Q.
if (cm->frame_type == KEY_FRAME) {

2
vp9/encoder/vp9_ratectrl.h
View File

@@ -160,7 +160,7 @@ void vp9_rc_postencode_update_drop_frame(struct VP9_COMP *cpi);
// Updates rate correction factors
// Changes only the rate correction factors in the rate control structure.
void vp9_rc_update_rate_correction_factors(struct VP9_COMP *cpi, int damp_var);
void vp9_rc_update_rate_correction_factors(struct VP9_COMP *cpi);
// Decide if we should drop this frame: For 1-pass CBR.
// Changes only the decimation count in the rate control structure