Commit 587f0cd3 authored by Yaowu Xu's avatar Yaowu Xu Committed by Gerrit Code Review
Browse files

Merge "Prevent severe rate control errors in CBR mode"

parents 3c715863 ffa06b37
......@@ -430,7 +430,8 @@ void vp9_rc_update_rate_correction_factors(VP9_COMP *cpi, int damp_var) {
adjustment_limit = 0.75;
break;
case 1:
adjustment_limit = 0.125 + 0.5 * MIN(1, fabs(log10(0.01 * correction_factor)));
adjustment_limit = 0.25 +
0.5 * MIN(1, fabs(log10(0.01 * correction_factor)));
break;
case 2:
default:
......@@ -438,12 +439,21 @@ void vp9_rc_update_rate_correction_factors(VP9_COMP *cpi, int damp_var) {
break;
}
cpi->rc.q_2_frame = cpi->rc.q_1_frame;
cpi->rc.q_1_frame = cm->base_qindex;
cpi->rc.rc_2_frame = cpi->rc.rc_1_frame;
if (correction_factor > 110)
cpi->rc.rc_1_frame = -1;
else if (correction_factor < 90)
cpi->rc.rc_1_frame = 1;
else
cpi->rc.rc_1_frame = 0;
if (correction_factor > 102) {
// We are not already at the worst allowable quality
correction_factor = (int)(100 + ((correction_factor - 100) *
adjustment_limit));
rate_correction_factor = (rate_correction_factor * correction_factor) / 100;
// Keep rate_correction_factor within limits
if (rate_correction_factor > MAX_BPB_FACTOR)
rate_correction_factor = MAX_BPB_FACTOR;
......@@ -494,6 +504,14 @@ int vp9_rc_regulate_q(const VP9_COMP *cpi, int target_bits_per_frame,
}
} while (++i <= active_worst_quality);
// In CBR mode, this makes sure q is between oscillating Qs to prevent
// resonance.
if (cpi->oxcf.rc_mode == VPX_CBR &&
(cpi->rc.rc_1_frame * cpi->rc.rc_2_frame == -1) &&
cpi->rc.q_1_frame != cpi->rc.q_2_frame) {
q = clamp(q, MIN(cpi->rc.q_1_frame, cpi->rc.q_2_frame),
MAX(cpi->rc.q_1_frame, cpi->rc.q_2_frame));
}
return q;
}
......
......@@ -99,7 +99,14 @@ typedef struct {
int64_t starting_buffer_level;
int64_t optimal_buffer_level;
int64_t maximum_buffer_size;
// int active_best_quality;
// rate control history for last frame(1) and the frame before(2).
// -1: undershot
// 1: overshoot
// 0: not initialized.
int rc_1_frame;
int rc_2_frame;
int q_1_frame;
int q_2_frame;
} RATE_CONTROL;
struct VP9_COMP;
......
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