ref: 231ef057c47caad6490204b140d724f5b937393e
parent: 7e7c95a291c70680d6ec3bc499fe745362b27659
author: Dmitry Kovalev <[email protected]>
date: Tue Apr 8 11:21:30 EDT 2014
Cleaning up vp9_firstpass.c Change-Id: Ie5723690f7c0bfa29a7ccef5da0c6c6326600ee6
--- a/vp9/encoder/vp9_firstpass.c
+++ b/vp9/encoder/vp9_firstpass.c
@@ -258,13 +258,14 @@
static double calculate_modified_err(const VP9_COMP *cpi,
const FIRSTPASS_STATS *this_frame) {const struct twopass_rc *twopass = &cpi->twopass;
+ const SVC *const svc = &cpi->svc;
const FIRSTPASS_STATS *stats;
double av_err;
double modified_error;
- if (cpi->svc.number_spatial_layers > 1 &&
- cpi->svc.number_temporal_layers == 1) {- twopass = &cpi->svc.layer_context[cpi->svc.spatial_layer_id].twopass;
+ if (svc->number_spatial_layers > 1 &&
+ svc->number_temporal_layers == 1) {+ twopass = &svc->layer_context[svc->spatial_layer_id].twopass;
}
stats = &twopass->total_stats;
@@ -335,15 +336,13 @@
}
// This function returns the maximum target rate per frame.
-static int frame_max_bits(const VP9_COMP *cpi) {- int64_t max_bits =
- ((int64_t)cpi->rc.av_per_frame_bandwidth *
- (int64_t)cpi->oxcf.two_pass_vbrmax_section) / 100;
-
+static int frame_max_bits(const RATE_CONTROL *rc, const VP9_CONFIG *oxcf) {+ int64_t max_bits = ((int64_t)rc->av_per_frame_bandwidth *
+ (int64_t)oxcf->two_pass_vbrmax_section) / 100;
if (max_bits < 0)
max_bits = 0;
- else if (max_bits > cpi->rc.max_frame_bandwidth)
- max_bits = cpi->rc.max_frame_bandwidth;
+ else if (max_bits > rc->max_frame_bandwidth)
+ max_bits = rc->max_frame_bandwidth;
return (int)max_bits;
}
@@ -1058,8 +1057,8 @@
// Function to test for a condition where a complex transition is followed
// by a static section. For example in slide shows where there is a fade
// between slides. This is to help with more optimal kf and gf positioning.
-static int detect_transition_to_still(VP9_COMP *cpi, int frame_interval,
- int still_interval,
+static int detect_transition_to_still(struct twopass_rc *twopass,
+ int frame_interval, int still_interval,
double loop_decay_rate,
double last_decay_rate) {int trans_to_still = 0;
@@ -1071,12 +1070,12 @@
loop_decay_rate >= 0.999 &&
last_decay_rate < 0.9) {int j;
- const FIRSTPASS_STATS *position = cpi->twopass.stats_in;
+ const FIRSTPASS_STATS *position = twopass->stats_in;
FIRSTPASS_STATS tmp_next_frame;
// Look ahead a few frames to see if static condition persists...
for (j = 0; j < still_interval; ++j) {- if (EOF == input_stats(&cpi->twopass, &tmp_next_frame))
+ if (EOF == input_stats(twopass, &tmp_next_frame))
break;
if (tmp_next_frame.pcnt_inter - tmp_next_frame.pcnt_motion < 0.999)
@@ -1083,7 +1082,7 @@
break;
}
- reset_fpf_position(&cpi->twopass, position);
+ reset_fpf_position(twopass, position);
// Only if it does do we signal a transition to still.
if (j == still_interval)
@@ -1405,9 +1404,11 @@
// Analyse and define a gf/arf group.
static void define_gf_group(VP9_COMP *cpi, FIRSTPASS_STATS *this_frame) {+ RATE_CONTROL *const rc = &cpi->rc;
+ VP9_CONFIG *const oxcf = &cpi->oxcf;
+ struct twopass_rc *const twopass = &cpi->twopass;
FIRSTPASS_STATS next_frame = { 0 };const FIRSTPASS_STATS *start_pos;
- struct twopass_rc *const twopass = &cpi->twopass;
int i;
double boost_score = 0.0;
double old_boost_score = 0.0;
@@ -1426,16 +1427,14 @@
double mv_in_out_accumulator = 0.0;
double abs_mv_in_out_accumulator = 0.0;
double mv_ratio_accumulator_thresh;
- const int max_bits = frame_max_bits(cpi); // Max bits for a single frame.
+ // Max bits for a single frame.
+ const int max_bits = frame_max_bits(rc, oxcf);
+ unsigned int allow_alt_ref = oxcf->play_alternate && oxcf->lag_in_frames;
- unsigned int allow_alt_ref = cpi->oxcf.play_alternate &&
- cpi->oxcf.lag_in_frames;
-
int f_boost = 0;
int b_boost = 0;
int flash_detected;
int active_max_gf_interval;
- RATE_CONTROL *const rc = &cpi->rc;
twopass->gf_group_bits = 0;
@@ -1507,7 +1506,7 @@
// Break clause to detect very still sections after motion. For example,
// a static image after a fade or other transition.
- if (detect_transition_to_still(cpi, i, 5, loop_decay_rate,
+ if (detect_transition_to_still(twopass, i, 5, loop_decay_rate,
last_loop_decay_rate)) {allow_alt_ref = 0;
break;
@@ -1791,36 +1790,36 @@
// Allocate bits to a normal frame that is neither a gf an arf or a key frame.
static void assign_std_frame_bits(VP9_COMP *cpi, FIRSTPASS_STATS *this_frame) {+ struct twopass_rc *twopass = &cpi->twopass;
+ // For a single frame.
+ const int max_bits = frame_max_bits(&cpi->rc, &cpi->oxcf);
+ // Calculate modified prediction error used in bit allocation.
+ const double modified_err = calculate_modified_err(cpi, this_frame);
int target_frame_size;
- double modified_err;
double err_fraction;
- const int max_bits = frame_max_bits(cpi); // Max for a single frame.
- // Calculate modified prediction error used in bit allocation.
- modified_err = calculate_modified_err(cpi, this_frame);
-
- if (cpi->twopass.gf_group_error_left > 0)
+ if (twopass->gf_group_error_left > 0)
// What portion of the remaining GF group error is used by this frame.
- err_fraction = modified_err / cpi->twopass.gf_group_error_left;
+ err_fraction = modified_err / twopass->gf_group_error_left;
else
err_fraction = 0.0;
// How many of those bits available for allocation should we give it?
- target_frame_size = (int)((double)cpi->twopass.gf_group_bits * err_fraction);
+ target_frame_size = (int)((double)twopass->gf_group_bits * err_fraction);
// Clip target size to 0 - max_bits (or cpi->twopass.gf_group_bits) at
// the top end.
target_frame_size = clamp(target_frame_size, 0,
- MIN(max_bits, (int)cpi->twopass.gf_group_bits));
+ MIN(max_bits, (int)twopass->gf_group_bits));
// Adjust error and bits remaining.
- cpi->twopass.gf_group_error_left -= (int64_t)modified_err;
+ twopass->gf_group_error_left -= (int64_t)modified_err;
// Per frame bit target for this frame.
vp9_rc_set_frame_target(cpi, target_frame_size);
}
-static int test_candidate_kf(VP9_COMP *cpi,
+static int test_candidate_kf(struct twopass_rc *twopass,
const FIRSTPASS_STATS *last_frame,
const FIRSTPASS_STATS *this_frame,
const FIRSTPASS_STATS *next_frame) {@@ -1841,7 +1840,7 @@
((next_frame->intra_error /
DOUBLE_DIVIDE_CHECK(next_frame->coded_error)) > 3.5))))) {int i;
- const FIRSTPASS_STATS *start_pos = cpi->twopass.stats_in;
+ const FIRSTPASS_STATS *start_pos = twopass->stats_in;
FIRSTPASS_STATS local_next_frame = *next_frame;
double boost_score = 0.0;
double old_boost_score = 0.0;
@@ -1878,7 +1877,7 @@
old_boost_score = boost_score;
// Get the next frame details
- if (EOF == input_stats(&cpi->twopass, &local_next_frame))
+ if (EOF == input_stats(twopass, &local_next_frame))
break;
}
@@ -1888,7 +1887,7 @@
is_viable_kf = 1;
} else {// Reset the file position
- reset_fpf_position(&cpi->twopass, start_pos);
+ reset_fpf_position(twopass, start_pos);
is_viable_kf = 0;
}
@@ -1901,16 +1900,13 @@
int i, j;
RATE_CONTROL *const rc = &cpi->rc;
struct twopass_rc *const twopass = &cpi->twopass;
- FIRSTPASS_STATS last_frame;
const FIRSTPASS_STATS first_frame = *this_frame;
- FIRSTPASS_STATS next_frame;
const FIRSTPASS_STATS *start_position = twopass->stats_in;
-
+ FIRSTPASS_STATS next_frame;
+ FIRSTPASS_STATS last_frame;
double decay_accumulator = 1.0;
double zero_motion_accumulator = 1.0;
- double boost_score = 0;
- double loop_decay_rate;
-
+ double boost_score = 0.0;
double kf_mod_err = 0.0;
double kf_group_err = 0.0;
double recent_loop_decay[8] = {1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0};@@ -1948,8 +1944,10 @@
// Provided that we are not at the end of the file...
if (cpi->oxcf.auto_key &&
lookup_next_frame_stats(twopass, &next_frame) != EOF) {+ double loop_decay_rate;
+
// Check for a scene cut.
- if (test_candidate_kf(cpi, &last_frame, this_frame, &next_frame))
+ if (test_candidate_kf(twopass, &last_frame, this_frame, &next_frame))
break;
// How fast is the prediction quality decaying?
@@ -1965,7 +1963,7 @@
// Special check for transition or high motion followed by a
// static scene.
- if (detect_transition_to_still(cpi, i, cpi->key_frame_frequency - i,
+ if (detect_transition_to_still(twopass, i, cpi->key_frame_frequency - i,
loop_decay_rate, decay_accumulator))
break;
@@ -2018,7 +2016,7 @@
// Calculate the number of bits that should be assigned to the kf group.
if (twopass->bits_left > 0 && twopass->modified_error_left > 0.0) {// Maximum number of bits for a single normal frame (not key frame).
- const int max_bits = frame_max_bits(cpi);
+ const int max_bits = frame_max_bits(rc, &cpi->oxcf);
// Maximum number of bits allocated to the key frame group.
int64_t max_grp_bits;
@@ -2070,10 +2068,10 @@
// How fast is prediction quality decaying.
if (!detect_flash(twopass, 0)) {- loop_decay_rate = get_prediction_decay_rate(&cpi->common, &next_frame);
+ const double loop_decay_rate = get_prediction_decay_rate(&cpi->common,
+ &next_frame);
decay_accumulator *= loop_decay_rate;
- decay_accumulator = decay_accumulator < MIN_DECAY_FACTOR
- ? MIN_DECAY_FACTOR : decay_accumulator;
+ decay_accumulator = MAX(decay_accumulator, MIN_DECAY_FACTOR);
}
boost_score += (decay_accumulator * r);
@@ -2104,7 +2102,6 @@
if (1) {int kf_boost = (int)boost_score;
int allocation_chunks;
- int alt_kf_bits;
if (kf_boost < (rc->frames_to_key * 3))
kf_boost = (rc->frames_to_key * 3);
@@ -2138,14 +2135,12 @@
// Prevent overflow.
if (kf_boost > 1028) {- int divisor = kf_boost >> 10;
+ const int divisor = kf_boost >> 10;
kf_boost /= divisor;
allocation_chunks /= divisor;
}
- twopass->kf_group_bits = (twopass->kf_group_bits < 0) ? 0
- : twopass->kf_group_bits;
-
+ twopass->kf_group_bits = MAX(0, twopass->kf_group_bits);
// Calculate the number of bits to be spent on the key frame.
twopass->kf_bits = (int)((double)kf_boost *
((double)twopass->kf_group_bits / allocation_chunks));
@@ -2155,11 +2150,11 @@
// then use an alternate calculation based on the kf error score
// which should give a smaller key frame.
if (kf_mod_err < kf_group_err / rc->frames_to_key) {- double alt_kf_grp_bits = ((double)twopass->bits_left *
+ double alt_kf_grp_bits = ((double)twopass->bits_left *
(kf_mod_err * (double)rc->frames_to_key) /
DOUBLE_DIVIDE_CHECK(twopass->modified_error_left));
- alt_kf_bits = (int)((double)kf_boost *
+ const int alt_kf_bits = (int)((double)kf_boost *
(alt_kf_grp_bits / (double)allocation_chunks));
if (twopass->kf_bits > alt_kf_bits)
@@ -2168,12 +2163,11 @@
// Else if it is much harder than other frames in the group make sure
// it at least receives an allocation in keeping with its relative
// error score.
- alt_kf_bits = (int)((double)twopass->bits_left * (kf_mod_err /
+ const int alt_kf_bits = (int)((double)twopass->bits_left * (kf_mod_err /
DOUBLE_DIVIDE_CHECK(twopass->modified_error_left)));
- if (alt_kf_bits > twopass->kf_bits) {+ if (alt_kf_bits > twopass->kf_bits)
twopass->kf_bits = alt_kf_bits;
- }
}
twopass->kf_group_bits -= twopass->kf_bits;
// Per frame bit target for this frame.