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Merge "Revert "Skip the last frame update for some frame repeats.""

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paulwilkins 2015-05-15 09:17:17 +00:00 committed by Gerrit Code Review
commit 4f569e8485
1 changed files with 0 additions and 34 deletions
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34
vp9/encoder/vp9_encoder.c
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@ -3423,32 +3423,6 @@ int setup_interp_filter_search_mask(VP9_COMP *cpi) {
return mask;
}
#define EXTREME_UNDERSHOOT_RATIO 10
#define LOW_ABSOLUTE_RATE_PER_MB 2
static int frame_repeat_detected(VP9_COMP *cpi) {
RATE_CONTROL *const rc = &cpi->rc;
int repeat_detected = 0;
int low_rate = LOW_ABSOLUTE_RATE_PER_MB * cpi->common.MBs;
// Detects an "unexpected frame buffer repeat".
// This status is not strictly a frame repeat but is triggered when
// a frame hugely undershoots the expected first pass target and in
// absolute terms the rate is very low. A typical situation where this may
// occurr is if the frame, whilst not matching the previous frame, DOES very
// closely match the contents of one of the other frame buffers. A genuinely
// static scene should not normally trigger this case as the last frame
// will also match and the predicted rate will thus be low.
if (!frame_is_kf_gf_arf(cpi) && !cpi->rc.is_src_frame_alt_ref &&
rc->projected_frame_size) {
if ((rc->projected_frame_size < low_rate) &&
((rc->base_frame_target / rc->projected_frame_size) >=
EXTREME_UNDERSHOOT_RATIO)) {
repeat_detected = 1;
}
}
return repeat_detected;
}
static void encode_frame_to_data_rate(VP9_COMP *cpi,
size_t *size,
uint8_t *dest,
@ -3592,14 +3566,6 @@ static void encode_frame_to_data_rate(VP9_COMP *cpi,
cm->frame_to_show = get_frame_new_buffer(cm);
// Test for special case where the frame appears to be a repeat of an earlier
// encoded frame buffer but this was not predicted by the first pass.
// In this case do not update the last frame buffer.
if ((cpi->oxcf.pass == 2) && (frame_is_intra_only(cm) == 0) &&
frame_repeat_detected(cpi)) {
cpi->refresh_last_frame = 0;
}
// Pick the loop filter level for the frame.
loopfilter_frame(cpi, cm);