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Merge "Fast feedback of bits on undershoot."

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This commit is contained in:
paulwilkins
2015-06-01 18:15:09 +00:00
committed by Gerrit Code Review
parent 71e88f903d 883fdd45cf
commit dbd3760712
5 changed files with 61 additions and 9 deletions
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6
vp9/encoder/vp9_encoder.c
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@@ -2804,7 +2804,8 @@ static void output_frame_level_debug_stats(VP9_COMP *cpi) {
if (cpi->twopass.total_left_stats.coded_error != 0.0)
fprintf(f, "%10u %dx%d %d %d %10d %10d %10d %10d"
"%10"PRId64" %10"PRId64" %10"PRId64" %10"PRId64" %10d "
"%10"PRId64" %10"PRId64" %5d %5d %10"PRId64" "
"%10"PRId64" %10"PRId64" %10d "
"%7.2lf %7.2lf %7.2lf %7.2lf %7.2lf"
"%6d %6d %5d %5d %5d "
"%10"PRId64" %10.3lf"
@@ -2818,6 +2819,9 @@ static void output_frame_level_debug_stats(VP9_COMP *cpi) {
cpi->rc.projected_frame_size / cpi->common.MBs,
(cpi->rc.projected_frame_size - cpi->rc.this_frame_target),
cpi->rc.vbr_bits_off_target,
cpi->rc.vbr_bits_off_target_fast,
cpi->twopass.extend_minq,
cpi->twopass.extend_minq_fast,
cpi->rc.total_target_vs_actual,
(cpi->rc.starting_buffer_level - cpi->rc.bits_off_target),
cpi->rc.total_actual_bits, cm->base_qindex,

31
vp9/encoder/vp9_firstpass.c
View File

@@ -1248,8 +1248,9 @@ void vp9_init_second_pass(VP9_COMP *cpi) {
twopass->modified_error_left = modified_error_total;
}
// Reset the vbr bits off target counter
// Reset the vbr bits off target counters
cpi->rc.vbr_bits_off_target = 0;
cpi->rc.vbr_bits_off_target_fast = 0;
cpi->rc.rate_error_estimate = 0;
@@ -2650,6 +2651,7 @@ void vp9_rc_get_second_pass_params(VP9_COMP *cpi) {
#define MINQ_ADJ_LIMIT 48
#define MINQ_ADJ_LIMIT_CQ 20
#define HIGH_UNDERSHOOT_RATIO 2
void vp9_twopass_postencode_update(VP9_COMP *cpi) {
TWO_PASS *const twopass = &cpi->twopass;
RATE_CONTROL *const rc = &cpi->rc;
@@ -2716,5 +2718,32 @@ void vp9_twopass_postencode_update(VP9_COMP *cpi) {
twopass->extend_minq = clamp(twopass->extend_minq, 0, minq_adj_limit);
twopass->extend_maxq = clamp(twopass->extend_maxq, 0, maxq_adj_limit);
// If there is a big and undexpected undershoot then feed the extra
// bits back in quickly. One situation where this may happen is if a
// frame is unexpectedly almost perfectly predicted by the ARF or GF
// but not very well predcited by the previous frame.
if (!frame_is_kf_gf_arf(cpi) && !cpi->rc.is_src_frame_alt_ref) {
int fast_extra_thresh = rc->base_frame_target / HIGH_UNDERSHOOT_RATIO;
if (rc->projected_frame_size < fast_extra_thresh) {
rc->vbr_bits_off_target_fast +=
fast_extra_thresh - rc->projected_frame_size;
rc->vbr_bits_off_target_fast =
MIN(rc->vbr_bits_off_target_fast, (4 * rc->avg_frame_bandwidth));
// Fast adaptation of minQ if necessary to use up the extra bits.
if (rc->avg_frame_bandwidth) {
twopass->extend_minq_fast =
(int)(rc->vbr_bits_off_target_fast * 8 / rc->avg_frame_bandwidth);
}
twopass->extend_minq_fast = MIN(twopass->extend_minq_fast,
minq_adj_limit - twopass->extend_minq);
} else if (rc->vbr_bits_off_target_fast) {
twopass->extend_minq_fast = MIN(twopass->extend_minq_fast,
minq_adj_limit - twopass->extend_minq);
} else {
twopass->extend_minq_fast = 0;
}
}
}
}

2
vp9/encoder/vp9_firstpass.h
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@@ -122,6 +122,7 @@ typedef struct {
int baseline_active_worst_quality;
int extend_minq;
int extend_maxq;
int extend_minq_fast;
GF_GROUP gf_group;
} TWO_PASS;
@@ -135,6 +136,7 @@ void vp9_end_first_pass(struct VP9_COMP *cpi);
void vp9_init_second_pass(struct VP9_COMP *cpi);
void vp9_rc_get_second_pass_params(struct VP9_COMP *cpi);
void vp9_twopass_postencode_update(struct VP9_COMP *cpi);
// Post encode update of the rate control parameters for 2-pass
void vp9_twopass_postencode_update(struct VP9_COMP *cpi);

28
vp9/encoder/vp9_ratectrl.c
View File

@@ -1061,10 +1061,12 @@ static int rc_pick_q_and_bounds_two_pass(const VP9_COMP *cpi,
if (frame_is_intra_only(cm) ||
(!rc->is_src_frame_alt_ref &&
(cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame))) {
active_best_quality -= cpi->twopass.extend_minq;
active_best_quality -=
(cpi->twopass.extend_minq + cpi->twopass.extend_minq_fast);
active_worst_quality += (cpi->twopass.extend_maxq / 2);
} else {
active_best_quality -= cpi->twopass.extend_minq / 2;
active_best_quality -=
(cpi->twopass.extend_minq + cpi->twopass.extend_minq_fast) / 2;
active_worst_quality += cpi->twopass.extend_maxq;
}
}
@@ -1671,9 +1673,9 @@ void vp9_rc_update_framerate(VP9_COMP *cpi) {
#define VBR_PCT_ADJUSTMENT_LIMIT 50
// For VBR...adjustment to the frame target based on error from previous frames
static void vbr_rate_correction(VP9_COMP *cpi,
int *this_frame_target,
int64_t vbr_bits_off_target) {
static void vbr_rate_correction(VP9_COMP *cpi, int *this_frame_target) {
RATE_CONTROL *const rc = &cpi->rc;
int64_t vbr_bits_off_target = rc->vbr_bits_off_target;
int max_delta;
double position_factor = 1.0;
@@ -1697,6 +1699,20 @@ static void vbr_rate_correction(VP9_COMP *cpi,
(vbr_bits_off_target < -max_delta) ? max_delta
: (int)-vbr_bits_off_target;
}
// Fast redistribution of bits arising from massive local undershoot.
// Dont do it for kf,arf,gf or overlay frames.
if (!frame_is_kf_gf_arf(cpi) && !rc->is_src_frame_alt_ref &&
rc->vbr_bits_off_target_fast) {
int one_frame_bits = MAX(rc->avg_frame_bandwidth, *this_frame_target);
int fast_extra_bits;
fast_extra_bits =
(int)MIN(rc->vbr_bits_off_target_fast, one_frame_bits);
fast_extra_bits = (int)MIN(fast_extra_bits,
MAX(one_frame_bits / 8, rc->vbr_bits_off_target_fast / 8));
*this_frame_target += (int)fast_extra_bits;
rc->vbr_bits_off_target_fast -= fast_extra_bits;
}
}
void vp9_set_target_rate(VP9_COMP *cpi) {
@@ -1705,6 +1721,6 @@ void vp9_set_target_rate(VP9_COMP *cpi) {
// Correction to rate target based on prior over or under shoot.
if (cpi->oxcf.rc_mode == VPX_VBR || cpi->oxcf.rc_mode == VPX_CQ)
vbr_rate_correction(cpi, &target_rate, rc->vbr_bits_off_target);
vbr_rate_correction(cpi, &target_rate);
vp9_rc_set_frame_target(cpi, target_rate);
}

1
vp9/encoder/vp9_ratectrl.h
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@@ -100,6 +100,7 @@ typedef struct {
int64_t buffer_level;
int64_t bits_off_target;
int64_t vbr_bits_off_target;
int64_t vbr_bits_off_target_fast;
int decimation_factor;
int decimation_count;