resize-refacor: Remove changing of scale by rate control
This patch removes resize triggering by rate control and also removes
pending resizes causing recodes in encode_with_recode_loop. The removed
functionality will be replaced in the future, but it is simply being
removed for now to simplify the work to do.
Change-Id: Ia4a5840dcb463faab5aab1c08f640a7bcf5e6c5a
diff --git a/av1/encoder/ratectrl.c b/av1/encoder/ratectrl.c
index 8500b83..efca371 100644
--- a/av1/encoder/ratectrl.c
+++ b/av1/encoder/ratectrl.c
@@ -1509,10 +1509,7 @@
target = calc_pframe_target_size_one_pass_cbr(cpi);
av1_rc_set_frame_target(cpi, target);
- if (cpi->oxcf.resize_mode == RESIZE_DYNAMIC)
- cpi->resize_pending = av1_resize_one_pass_cbr(cpi);
- else
- cpi->resize_pending = 0;
+ // TODO(afergs): Decide whether to scale up, down, or not at all
}
int av1_compute_qdelta(const RATE_CONTROL *rc, double qstart, double qtarget,
@@ -1678,90 +1675,3 @@
vbr_rate_correction(cpi, &target_rate);
av1_rc_set_frame_target(cpi, target_rate);
}
-
-// Check if we should resize, based on average QP from past x frames.
-// Only allow for resize at most one scale down for now, scaling factor is 2.
-int av1_resize_one_pass_cbr(AV1_COMP *cpi) {
- const AV1_COMMON *const cm = &cpi->common;
- RATE_CONTROL *const rc = &cpi->rc;
- int resize_now = 0;
- cpi->resize_scale_num = 1;
- cpi->resize_scale_den = 1;
- // Don't resize on key frame; reset the counters on key frame.
- if (cm->frame_type == KEY_FRAME) {
- cpi->resize_avg_qp = 0;
- cpi->resize_count = 0;
- return 0;
- }
- // Resize based on average buffer underflow and QP over some window.
- // Ignore samples close to key frame, since QP is usually high after key.
- if (cpi->rc.frames_since_key > 2 * cpi->framerate) {
- const int window = (int)(5 * cpi->framerate);
- cpi->resize_avg_qp += cm->base_qindex;
- if (cpi->rc.buffer_level < (int)(30 * rc->optimal_buffer_level / 100))
- ++cpi->resize_buffer_underflow;
- ++cpi->resize_count;
- // Check for resize action every "window" frames.
- if (cpi->resize_count >= window) {
- int avg_qp = cpi->resize_avg_qp / cpi->resize_count;
- // Resize down if buffer level has underflowed sufficent amount in past
- // window, and we are at original resolution.
- // Resize back up if average QP is low, and we are currently in a resized
- // down state.
- if (cpi->resize_state == 0 &&
- cpi->resize_buffer_underflow > (cpi->resize_count >> 2)) {
- resize_now = 1;
- cpi->resize_state = 1;
- } else if (cpi->resize_state == 1 &&
- avg_qp < 40 * cpi->rc.worst_quality / 100) {
- resize_now = -1;
- cpi->resize_state = 0;
- }
- // Reset for next window measurement.
- cpi->resize_avg_qp = 0;
- cpi->resize_count = 0;
- cpi->resize_buffer_underflow = 0;
- }
- }
- // If decision is to resize, reset some quantities, and check is we should
- // reduce rate correction factor,
- if (resize_now != 0) {
- int target_bits_per_frame;
- int active_worst_quality;
- int qindex;
- int tot_scale_change;
- // For now, resize is by 1/2 x 1/2.
- cpi->resize_scale_num = 1;
- cpi->resize_scale_den = 2;
- tot_scale_change = (cpi->resize_scale_den * cpi->resize_scale_den) /
- (cpi->resize_scale_num * cpi->resize_scale_num);
- // Reset buffer level to optimal, update target size.
- rc->buffer_level = rc->optimal_buffer_level;
- rc->bits_off_target = rc->optimal_buffer_level;
- rc->this_frame_target = calc_pframe_target_size_one_pass_cbr(cpi);
- // Reset cyclic refresh parameters.
- if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cm->seg.enabled)
- av1_cyclic_refresh_reset_resize(cpi);
- // Get the projected qindex, based on the scaled target frame size (scaled
- // so target_bits_per_mb in av1_rc_regulate_q will be correct target).
- target_bits_per_frame = (resize_now == 1)
- ? rc->this_frame_target * tot_scale_change
- : rc->this_frame_target / tot_scale_change;
- active_worst_quality = calc_active_worst_quality_one_pass_cbr(cpi);
- qindex = av1_rc_regulate_q(cpi, target_bits_per_frame, rc->best_quality,
- active_worst_quality);
- // If resize is down, check if projected q index is close to worst_quality,
- // and if so, reduce the rate correction factor (since likely can afford
- // lower q for resized frame).
- if (resize_now == 1 && qindex > 90 * cpi->rc.worst_quality / 100) {
- rc->rate_correction_factors[INTER_NORMAL] *= 0.85;
- }
- // If resize is back up, check if projected q index is too much above the
- // current base_qindex, and if so, reduce the rate correction factor
- // (since prefer to keep q for resized frame at least close to previous q).
- if (resize_now == -1 && qindex > 130 * cm->base_qindex / 100) {
- rc->rate_correction_factors[INTER_NORMAL] *= 0.9;
- }
- }
- return resize_now;
-}
