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Merge "Adjust some parameters for cyclic refresh for low bitrates."

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This commit is contained in:
Marco
2015-06-09 23:22:28 +00:00
committed by Gerrit Code Review
parent 2fd31bbba7 997ac14c6a
commit 61c5c96ae1
2 changed files with 20 additions and 4 deletions
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21
vp9/encoder/vp9_aq_cyclicrefresh.c
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@@ -48,6 +48,8 @@ struct CYCLIC_REFRESH {
int16_t motion_thresh;
// Rate target ratio to set q delta.
double rate_ratio_qdelta;
// Boost factor for rate target ratio, for segment CR_SEGMENT_ID_BOOST2.
double rate_boost_fac;
double low_content_avg;
int qindex_delta_seg1;
int qindex_delta_seg2;
@@ -93,6 +95,19 @@ static int apply_cyclic_refresh_bitrate(const VP9_COMMON *cm,
return 1;
}
static void adjust_cyclic_refresh_parameters(VP9_COMP *const cpi) {
const VP9_COMMON *const cm = &cpi->common;
const RATE_CONTROL *const rc = &cpi->rc;
CYCLIC_REFRESH *const cr = cpi->cyclic_refresh;
// Adjust some parameters, currently only for low resolutions at low bitrates.
if (cm->width <= 352 &&
cm->height <= 288 &&
rc->avg_frame_bandwidth < 3400) {
cr->motion_thresh = 4;
cr->rate_boost_fac = 1.25;
}
}
// Check if this coding block, of size bsize, should be considered for refresh
// (lower-qp coding). Decision can be based on various factors, such as
// size of the coding block (i.e., below min_block size rejected), coding
@@ -462,6 +477,7 @@ void vp9_cyclic_refresh_setup(VP9_COMP *const cpi) {
vp9_clear_system_state();
cr->max_qdelta_perc = 50;
cr->time_for_refresh = 0;
cr->rate_boost_fac = 1.7;
// Set rate threshold to some multiple (set to 2 for now) of the target
// rate (target is given by sb64_target_rate and scaled by 256).
cr->thresh_rate_sb = ((int64_t)(rc->sb64_target_rate) << 8) << 2;
@@ -470,6 +486,9 @@ void vp9_cyclic_refresh_setup(VP9_COMP *const cpi) {
// vp9_convert_qindex_to_q(), vp9_ac_quant(), ac_qlookup*[].
cr->thresh_dist_sb = ((int64_t)(q * q)) << 2;
cr->motion_thresh = 32;
adjust_cyclic_refresh_parameters(cpi);
// Set up segmentation.
// Clear down the segment map.
vp9_enable_segmentation(&cm->seg);
@@ -505,7 +524,7 @@ void vp9_cyclic_refresh_setup(VP9_COMP *const cpi) {
// Set a more aggressive (higher) q delta for segment BOOST2.
qindex_delta = compute_deltaq(cpi, cm->base_qindex,
MIN(CR_MAX_RATE_TARGET_RATIO,
CR_BOOST2_FAC * cr->rate_ratio_qdelta));
cr->rate_boost_fac * cr->rate_ratio_qdelta));
cr->qindex_delta_seg2 = qindex_delta;
vp9_set_segdata(seg, CR_SEGMENT_ID_BOOST2, SEG_LVL_ALT_Q, qindex_delta);

3
vp9/encoder/vp9_aq_cyclicrefresh.h
View File

@@ -27,9 +27,6 @@ extern "C" {
// Maximum rate target ratio for setting segment delta-qp.
#define CR_MAX_RATE_TARGET_RATIO 4.0
// Boost factor for rate target ratio, for segment CR_SEGMENT_ID_BOOST2.
#define CR_BOOST2_FAC 1.7
struct VP9_COMP;
struct CYCLIC_REFRESH;