Commit c8338ebf authored by Paul Wilkins's avatar Paul Wilkins
Browse files

KF/GF Pulsing

This change is designed to try and reduce pulsing effects when moving
with a complex transition like a fade, into an easy or static section in
an otherwise difficult clip in CQ mode.

The active CQ level is relaxed down to the user entered level for frames that
are generating less than the passed in minimum bandwidth.

Change-Id: Id6d8b551daad4f489c087bd742bc95418a95f3f0
parent b082790c
......@@ -2029,7 +2029,7 @@ void vp8_change_config(VP8_PTR ptr, VP8_CONFIG *oxcf)
cpi->buffered_mode = (cpi->oxcf.optimal_buffer_level > 0) ? TRUE : FALSE;
// Experimental cq target value
cpi->cq_target_quality = oxcf->cq_level;
cpi->cq_target_quality = cpi->oxcf.cq_level;
cpi->rolling_target_bits = cpi->av_per_frame_bandwidth;
cpi->rolling_actual_bits = cpi->av_per_frame_bandwidth;
......@@ -3519,14 +3519,29 @@ static BOOL recode_loop_test( VP8_COMP *cpi,
{
// General over and under shoot tests
if ( ((cpi->projected_frame_size > high_limit) && (q < maxq)) ||
((cpi->projected_frame_size < low_limit) && (q > minq)) ||
((cpi->oxcf.end_usage == USAGE_CONSTRAINED_QUALITY) &&
(q > cpi->cq_target_quality) &&
(cpi->projected_frame_size <
((cpi->this_frame_target * 7) >> 3))) )
((cpi->projected_frame_size < low_limit) && (q > minq)) )
{
force_recode = TRUE;
}
// Special Constrained quality tests
else if (cpi->oxcf.end_usage == USAGE_CONSTRAINED_QUALITY)
{
// Undershoot and below auto cq level
if ( (q > cpi->cq_target_quality) &&
(cpi->projected_frame_size <
((cpi->this_frame_target * 7) >> 3)))
{
force_recode = TRUE;
}
// Severe undershoot and between auto and user cq level
else if ( (q > cpi->oxcf.cq_level) &&
(cpi->projected_frame_size < cpi->min_frame_bandwidth) &&
(cpi->active_best_quality > cpi->oxcf.cq_level))
{
force_recode = TRUE;
cpi->active_best_quality = cpi->oxcf.cq_level;
}
}
}
return force_recode;
......@@ -3853,7 +3868,13 @@ static void encode_frame_to_data_rate
if ((cpi->oxcf.end_usage == USAGE_CONSTRAINED_QUALITY) &&
(cpi->active_best_quality < cpi->cq_target_quality) )
{
cpi->active_best_quality = cpi->cq_target_quality;
// If we are strongly undershooting the target rate in the last
// frames then use the user passed in cq value not the auto
// cq value.
if ( cpi->rolling_actual_bits < cpi->min_frame_bandwidth )
cpi->active_best_quality = cpi->oxcf.cq_level;
else
cpi->active_best_quality = cpi->cq_target_quality;
}
}
......@@ -4219,6 +4240,16 @@ static void encode_frame_to_data_rate
Q = vp8_regulate_q(cpi, cpi->this_frame_target);
// Special case reset for qlow for constrained quality.
// This should only trigger where there is very substantial
// undershoot on a frame and the auto cq level is above
// the user passsed in value.
if ( (cpi->oxcf.end_usage == USAGE_CONSTRAINED_QUALITY) &&
(Q < q_low) )
{
q_low = Q;
}
while (((Q > q_high) || (cpi->zbin_over_quant > zbin_oq_high)) && (Retries < 10))
{
vp8_update_rate_correction_factors(cpi, 0);
......
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