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VP9_resizing: add limitation to the downsacling resolution.

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Width and height of downscaling resolution should not be lower
than min_width and min_height which can be set as needed, both
are 180 for now.

Change-Id: I34d06704ea51affbdd814246e22ee8d41d991f00
This commit is contained in:
jackychen
2015-10-28 12:30:45 -07:00
parent f5f19a1fbd
commit dba2d5b3f3
1 changed files with 19 additions and 1 deletions
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20
vp9/encoder/vp9_ratectrl.c
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@@ -1835,6 +1835,9 @@ int vp9_resize_one_pass_cbr(VP9_COMP *cpi) {
RESIZE_ACTION resize_action = NO_RESIZE;
int avg_qp_thr1 = 70;
int avg_qp_thr2 = 50;
int min_width = 180;
int min_height = 180;
int down_size_on = 1;
cpi->resize_scale_num = 1;
cpi->resize_scale_den = 1;
// Don't resize on key frame; reset the counters on key frame.
@@ -1843,6 +1846,21 @@ int vp9_resize_one_pass_cbr(VP9_COMP *cpi) {
cpi->resize_count = 0;
return 0;
}
// Check current frame reslution to avoid generating frames smaller than
// the minimum resolution.
if (ONEHALFONLY_RESIZE) {
if ((cm->width >> 1) < min_width || (cm->height >> 1) < min_height)
down_size_on = 0;
} else {
if (cpi->resize_state == ORIG &&
(cm->width * 3 / 4 < min_width ||
cm->height * 3 / 4 < min_height))
return 0;
else if (cpi->resize_state == THREE_QUARTER &&
((cpi->oxcf.width >> 1) < min_width ||
(cpi->oxcf.height >> 1) < min_height))
down_size_on = 0;
}
#if CONFIG_VP9_TEMPORAL_DENOISING
// If denoiser is on, apply a smaller qp threshold.
@@ -1869,7 +1887,7 @@ int vp9_resize_one_pass_cbr(VP9_COMP *cpi) {
// down state, i.e. 1/2 or 3/4 of original resolution.
// Currently, use a flag to turn 3/4 resizing feature on/off.
if (cpi->resize_buffer_underflow > (cpi->resize_count >> 2)) {
if (cpi->resize_state == THREE_QUARTER) {
if (cpi->resize_state == THREE_QUARTER && down_size_on) {
resize_action = DOWN_ONEHALF;
cpi->resize_state = ONE_HALF;
} else if (cpi->resize_state == ORIG) {