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First pass clean up.

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One of a series of changes to clean up two pass
allocation as precursor to support for multiple arf
or boosted frames per GF/ARF group.

This change pulls out the calculation of the total bits
allocated to a GF/ARF group into a function, to aid
readability and reduce the line count for define_gf_group().

This change should have no material impact on output.

Change-Id: I716fba08e26f9ddde3257e7d9b188453791883a3
This commit is contained in:
Paul Wilkins
2014-05-09 14:38:38 +01:00
parent 3305909bc2
commit 00d54aa331
1 changed files with 30 additions and 17 deletions
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47
vp9/encoder/vp9_firstpass.c
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@@ -1417,6 +1417,34 @@ void define_fixed_arf_period(VP9_COMP *cpi) {
} }
#endif #endif
// Calculate the total bits to allocate in this GF/ARF group.
static int64_t calculate_total_gf_group_bits(VP9_COMP *cpi,
double gf_group_err) {
const RATE_CONTROL *const rc = &cpi->rc;
const struct twopass_rc *const twopass = &cpi->twopass;
const int max_bits = frame_max_bits(rc, &cpi->oxcf);
int64_t total_group_bits;
// Calculate the bits to be allocated to the group as a whole.
if ((twopass->kf_group_bits > 0) && (twopass->kf_group_error_left > 0)) {
total_group_bits = (int64_t)(twopass->kf_group_bits *
(gf_group_err / twopass->kf_group_error_left));
} else {
total_group_bits = 0;
}
// Clamp odd edge cases.
total_group_bits = (total_group_bits < 0) ?
0 : (total_group_bits > twopass->kf_group_bits) ?
twopass->kf_group_bits : total_group_bits;
// Clip based on user supplied data rate variability limit.
if (total_group_bits > (int64_t)max_bits * rc->baseline_gf_interval)
total_group_bits = (int64_t)max_bits * rc->baseline_gf_interval;
return total_group_bits;
}
// Analyse and define a gf/arf group. // Analyse and define a gf/arf group.
static void define_gf_group(VP9_COMP *cpi, FIRSTPASS_STATS *this_frame) { static void define_gf_group(VP9_COMP *cpi, FIRSTPASS_STATS *this_frame) {
RATE_CONTROL *const rc = &cpi->rc; RATE_CONTROL *const rc = &cpi->rc;
@@ -1442,8 +1470,6 @@ static void define_gf_group(VP9_COMP *cpi, FIRSTPASS_STATS *this_frame) {
double mv_in_out_accumulator = 0.0; double mv_in_out_accumulator = 0.0;
double abs_mv_in_out_accumulator = 0.0; double abs_mv_in_out_accumulator = 0.0;
double mv_ratio_accumulator_thresh; double mv_ratio_accumulator_thresh;
// 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 = oxcf->play_alternate && oxcf->lag_in_frames;
int f_boost = 0; int f_boost = 0;
@@ -1658,21 +1684,8 @@ static void define_gf_group(VP9_COMP *cpi, FIRSTPASS_STATS *this_frame) {
#endif #endif
#endif #endif
// Calculate the bits to be allocated to the group as a whole. // Calculate the bits to be allocated to the gf/arf group as a whole
if (twopass->kf_group_bits > 0 && twopass->kf_group_error_left > 0) { twopass->gf_group_bits = calculate_total_gf_group_bits(cpi, gf_group_err);
twopass->gf_group_bits = (int64_t)(twopass->kf_group_bits *
(gf_group_err / twopass->kf_group_error_left));
} else {
twopass->gf_group_bits = 0;
}
twopass->gf_group_bits = (twopass->gf_group_bits < 0) ?
0 : (twopass->gf_group_bits > twopass->kf_group_bits) ?
twopass->kf_group_bits : twopass->gf_group_bits;
// Clip cpi->twopass.gf_group_bits based on user supplied data rate
// variability limit, cpi->oxcf.two_pass_vbrmax_section.
if (twopass->gf_group_bits > (int64_t)max_bits * rc->baseline_gf_interval)
twopass->gf_group_bits = (int64_t)max_bits * rc->baseline_gf_interval;
// Reset the file position. // Reset the file position.
reset_fpf_position(twopass, start_pos); reset_fpf_position(twopass, start_pos);