ref: dad8dfe2543a7759c9b05cccd54eb97c8585c700
parent: 347df4ce55a82120944a4e2ee6cdf060b2f8307a
parent: 267daddecca2418b47f60142cee214185d31dce5
author: Yaowu Xu <yaowu@google.com>
date: Mon Dec 9 10:35:00 EST 2013
Merge "Further clean up of estimate_max_q."
--- a/vp9/encoder/vp9_firstpass.c
+++ b/vp9/encoder/vp9_firstpass.c
@@ -1008,10 +1008,8 @@
int target_norm_bits_per_mb;
double section_err = fpstats->coded_error / fpstats->count;
- double sr_correction;
double err_per_mb = section_err / num_mbs;
double err_correction_factor;
- double speed_correction = 1.0;
if (section_target_bandwitdh <= 0)
return cpi->twopass.maxq_max_limit; // Highest value allowed
@@ -1020,25 +1018,7 @@
? (512 * section_target_bandwitdh) / num_mbs
: 512 * (section_target_bandwitdh / num_mbs);
- // Look at the drop in prediction quality between the last frame
- // and the GF buffer (which contained an older frame).
- if (fpstats->sr_coded_error > fpstats->coded_error) {- double sr_err_diff = (fpstats->sr_coded_error - fpstats->coded_error) /
- (fpstats->count * cpi->common.MBs);
- sr_correction = fclamp(pow(sr_err_diff / 32.0, 0.25), 0.75, 1.25);
- } else {- sr_correction = 0.75;
- }
- // Corrections for higher compression speed settings
- // (reduced compression expected)
- // FIXME(jimbankoski): Once we settle on vp9 speed features we need to
- // change this code.
- if (cpi->compressor_speed == 1)
- speed_correction = cpi->oxcf.cpu_used <= 5 ?
- 1.04 + (/*cpi->oxcf.cpu_used*/0 * 0.04) :
- 1.25;
-
// Try and pick a max Q that will be high enough to encode the
// content at the given rate.
for (q = cpi->twopass.maxq_min_limit; q < cpi->twopass.maxq_max_limit; q++) {@@ -1045,8 +1025,7 @@
int bits_per_mb_at_this_q;
err_correction_factor = calc_correction_factor(err_per_mb,
- ERR_DIVISOR, 0.4, 0.90, q) *
- sr_correction * speed_correction;
+ ERR_DIVISOR, 0.4, 0.90, q);
bits_per_mb_at_this_q = vp9_rc_bits_per_mb(INTER_FRAME, q,
err_correction_factor);
@@ -1060,14 +1039,6 @@
q < cpi->cq_target_quality)
q = cpi->cq_target_quality;
- // Adjust maxq_min_limit and maxq_max_limit limits based on
- // average q observed in clip for non kf/gf/arf frames
- // Give average a chance to settle though.
- // PGW TODO.. This code is broken for the extended Q range
- if (cpi->rc.ni_frames > ((int)cpi->twopass.total_stats.count >> 8) &&
- cpi->rc.ni_frames > 25)
- adjust_maxq_qrange(cpi);
-
return q;
}
@@ -1083,9 +1054,6 @@
double section_err = (fpstats->coded_error / fpstats->count);
double err_per_mb = section_err / num_mbs;
double err_correction_factor;
- double sr_err_diff;
- double sr_correction;
- double speed_correction = 1.0;
double clip_iiratio;
double clip_iifactor;
@@ -1094,31 +1062,6 @@
: 512 * (section_target_bandwitdh / num_mbs);
- // Corrections for higher compression speed settings
- // (reduced compression expected)
- if (cpi->compressor_speed == 1) {- if (cpi->oxcf.cpu_used <= 5)
- speed_correction = 1.04 + (/*cpi->oxcf.cpu_used*/ 0 * 0.04);
- else
- speed_correction = 1.25;
- }
-
- // Look at the drop in prediction quality between the last frame
- // and the GF buffer (which contained an older frame).
- if (fpstats->sr_coded_error > fpstats->coded_error) {- sr_err_diff =
- (fpstats->sr_coded_error - fpstats->coded_error) /
- (fpstats->count * cpi->common.MBs);
- sr_correction = (sr_err_diff / 32.0);
- sr_correction = pow(sr_correction, 0.25);
- if (sr_correction < 0.75)
- sr_correction = 0.75;
- else if (sr_correction > 1.25)
- sr_correction = 1.25;
- } else {- sr_correction = 0.75;
- }
-
// II ratio correction factor for clip as a whole
clip_iiratio = cpi->twopass.total_stats.intra_error /
DOUBLE_DIVIDE_CHECK(cpi->twopass.total_stats.coded_error);
@@ -1132,8 +1075,7 @@
// Error per MB based correction factor
err_correction_factor =
- calc_correction_factor(err_per_mb, 100.0, 0.4, 0.90, q) *
- sr_correction * speed_correction * clip_iifactor;
+ calc_correction_factor(err_per_mb, 100.0, 0.4, 0.90, q) * clip_iifactor;
bits_per_mb_at_this_q =
vp9_rc_bits_per_mb(INTER_FRAME, q, err_correction_factor);
@@ -2146,53 +2088,28 @@
if (cpi->oxcf.end_usage == USAGE_CONSTANT_QUALITY) {cpi->rc.active_worst_quality = cpi->oxcf.cq_level;
- } else {+ } else if (cpi->common.current_video_frame == 0) {// Special case code for first frame.
- if (cpi->common.current_video_frame == 0) {- int section_target_bandwidth =
- (int)(cpi->twopass.bits_left / frames_left);
+ int section_target_bandwidth =
+ (int)(cpi->twopass.bits_left / frames_left);
- // guess at maxq needed in 2nd pass
- cpi->twopass.maxq_max_limit = cpi->rc.worst_quality;
- cpi->twopass.maxq_min_limit = cpi->rc.best_quality;
+ // guess at maxq needed in 2nd pass
+ cpi->twopass.maxq_max_limit = cpi->rc.worst_quality;
+ cpi->twopass.maxq_min_limit = cpi->rc.best_quality;
- tmp_q = estimate_max_q(cpi, &cpi->twopass.total_left_stats,
- section_target_bandwidth);
+ tmp_q = estimate_max_q(cpi, &cpi->twopass.total_left_stats,
+ section_target_bandwidth);
- cpi->rc.active_worst_quality = tmp_q;
- cpi->rc.ni_av_qi = tmp_q;
- cpi->rc.avg_q = vp9_convert_qindex_to_q(tmp_q);
+ cpi->rc.active_worst_quality = tmp_q;
+ cpi->rc.ni_av_qi = tmp_q;
+ cpi->rc.avg_q = vp9_convert_qindex_to_q(tmp_q);
- // Limit the maxq value returned subsequently.
- // This increases the risk of overspend or underspend if the initial
- // estimate for the clip is bad, but helps prevent excessive
- // variation in Q, especially near the end of a clip
- // where for example a small overspend may cause Q to crash
- adjust_maxq_qrange(cpi);
- }
-
- // The last few frames of a clip almost always have to few or too many
- // bits and for the sake of over exact rate control we dont want to make
- // radical adjustments to the allowed quantizer range just to use up a
- // few surplus bits or get beneath the target rate.
- else if ((cpi->common.current_video_frame <
- (((unsigned int)cpi->twopass.total_stats.count * 255) >> 8)) &&
- ((cpi->common.current_video_frame + cpi->rc.baseline_gf_interval) <
- (unsigned int)cpi->twopass.total_stats.count)) {- int section_target_bandwidth =
- (int)(cpi->twopass.bits_left / frames_left);
- if (frames_left < 1)
- frames_left = 1;
-
- tmp_q = estimate_max_q(
- cpi,
- &cpi->twopass.total_left_stats,
- section_target_bandwidth);
-
- // Make a damped adjustment to active max Q
- cpi->rc.active_worst_quality =
- adjust_active_maxq(cpi->rc.active_worst_quality, tmp_q);
- }
+ // Limit the maxq value returned subsequently.
+ // This increases the risk of overspend or underspend if the initial
+ // estimate for the clip is bad, but helps prevent excessive
+ // variation in Q, especially near the end of a clip
+ // where for example a small overspend may cause Q to crash
+ adjust_maxq_qrange(cpi);
}
vp9_zero(this_frame);
if (EOF == input_stats(cpi, &this_frame))
--
⑨