Commit a40fa1f9 authored by Marco's avatar Marco

vp9: Reset rc flags on some configuration changes.

For large dynamic changes in target avg_frame_bandwidth, or
a change in resolution, via the update in change_config()),
reset the under/overshoot flags (rc_1_frame, rc_2_frame)
to prevent constraining the QP for the first few frames
following the change.

For SVC use the spatial stream avg_frame_bandwidth in
reset condition.

For the avg_frame_bandwidth condition, use fairly large
threshold (~50%) for now in reset.

This allows for better/faster QP response if, for example,
application dynamically changes bitrate by large amount.

Change-Id: Ib6e3761732d956949d79c9247e50dba744a535c0
parent 94eaecaa
......@@ -1853,6 +1853,8 @@ void vp9_change_config(struct VP9_COMP *cpi, const VP9EncoderConfig *oxcf) {
cm->mi_rows * cm->mi_cols * sizeof(*cpi->consec_zero_mv));
if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ)
vp9_cyclic_refresh_reset_resize(cpi);
rc->rc_1_frame = 0;
rc->rc_2_frame = 0;
}
if ((cpi->svc.number_temporal_layers > 1 && cpi->oxcf.rc_mode == VPX_CBR) ||
......@@ -1863,6 +1865,21 @@ void vp9_change_config(struct VP9_COMP *cpi, const VP9EncoderConfig *oxcf) {
(int)cpi->oxcf.target_bandwidth);
}
// Check for resetting the rc flags (rc_1_frame, rc_2_frame) if the
// configuration change has a large change in avg_frame_bandwidth.
// For SVC check for resetting based on spatial layer average bandwidth.
if (cm->current_video_frame > 0) {
if (cpi->use_svc) {
vp9_svc_check_reset_layer_rc_flag(cpi);
} else {
if (rc->avg_frame_bandwidth > (3 * rc->last_avg_frame_bandwidth >> 1) ||
rc->avg_frame_bandwidth < (rc->last_avg_frame_bandwidth >> 1)) {
rc->rc_1_frame = 0;
rc->rc_2_frame = 0;
}
}
}
cpi->alt_ref_source = NULL;
rc->is_src_frame_alt_ref = 0;
......
......@@ -1488,6 +1488,8 @@ void vp9_rc_postencode_update(VP9_COMP *cpi, uint64_t bytes_used) {
cpi->rc.last_frame_is_src_altref = cpi->rc.is_src_frame_alt_ref;
}
if (cm->frame_type != KEY_FRAME) rc->reset_high_source_sad = 0;
rc->last_avg_frame_bandwidth = rc->avg_frame_bandwidth;
}
void vp9_rc_postencode_update_drop_frame(VP9_COMP *cpi) {
......
......@@ -152,6 +152,8 @@ typedef struct {
int rc_2_frame;
int q_1_frame;
int q_2_frame;
// Keep track of the last target average frame bandwidth.
int last_avg_frame_bandwidth;
// Auto frame-scaling variables.
FRAME_SCALE_LEVEL frame_size_selector;
......
......@@ -862,3 +862,26 @@ void vp9_svc_reset_key_frame(VP9_COMP *const cpi) {
vp9_update_temporal_layer_framerate(cpi);
vp9_restore_layer_context(cpi);
}
void vp9_svc_check_reset_layer_rc_flag(VP9_COMP *const cpi) {
SVC *svc = &cpi->svc;
int sl, tl;
for (sl = 0; sl < svc->number_spatial_layers; ++sl) {
// Check for reset based on avg_frame_bandwidth for spatial layer sl.
int layer = LAYER_IDS_TO_IDX(sl, svc->number_temporal_layers - 1,
svc->number_temporal_layers);
LAYER_CONTEXT *lc = &svc->layer_context[layer];
RATE_CONTROL *lrc = &lc->rc;
if (lrc->avg_frame_bandwidth > (3 * lrc->last_avg_frame_bandwidth >> 1) ||
lrc->avg_frame_bandwidth < (lrc->last_avg_frame_bandwidth >> 1)) {
// Reset for all temporal layers with spatial layer sl.
for (tl = 0; tl < svc->number_temporal_layers; ++tl) {
int layer = LAYER_IDS_TO_IDX(sl, tl, svc->number_temporal_layers);
LAYER_CONTEXT *lc = &svc->layer_context[layer];
RATE_CONTROL *lrc = &lc->rc;
lrc->rc_1_frame = 0;
lrc->rc_2_frame = 0;
}
}
}
}
......@@ -154,6 +154,8 @@ void vp9_free_svc_cyclic_refresh(struct VP9_COMP *const cpi);
void vp9_svc_reset_key_frame(struct VP9_COMP *const cpi);
void vp9_svc_check_reset_layer_rc_flag(struct VP9_COMP *const cpi);
#ifdef __cplusplus
} // extern "C"
#endif
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment