summaryrefslogtreecommitdiffstats
path: root/media/libaom/src/av1/encoder/aq_variance.c
diff options
context:
space:
mode:
Diffstat (limited to 'media/libaom/src/av1/encoder/aq_variance.c')
-rw-r--r--media/libaom/src/av1/encoder/aq_variance.c202
1 files changed, 202 insertions, 0 deletions
diff --git a/media/libaom/src/av1/encoder/aq_variance.c b/media/libaom/src/av1/encoder/aq_variance.c
new file mode 100644
index 000000000..58f906bdc
--- /dev/null
+++ b/media/libaom/src/av1/encoder/aq_variance.c
@@ -0,0 +1,202 @@
+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+#include <math.h>
+
+#include "aom_ports/mem.h"
+
+#include "av1/encoder/aq_variance.h"
+#include "av1/common/seg_common.h"
+#include "av1/encoder/encodeframe.h"
+#include "av1/encoder/ratectrl.h"
+#include "av1/encoder/rd.h"
+#include "av1/encoder/segmentation.h"
+#include "av1/encoder/dwt.h"
+#include "aom_ports/system_state.h"
+
+static const double rate_ratio[MAX_SEGMENTS] = { 2.2, 1.7, 1.3, 1.0,
+ 0.9, .8, .7, .6 };
+
+static const double deltaq_rate_ratio[MAX_SEGMENTS] = { 2.5, 2.0, 1.5, 1.0,
+ 0.75, 1.0, 1.0, 1.0 };
+#define ENERGY_MIN (-4)
+#define ENERGY_MAX (1)
+#define ENERGY_SPAN (ENERGY_MAX - ENERGY_MIN + 1)
+#define ENERGY_IN_BOUNDS(energy) \
+ assert((energy) >= ENERGY_MIN && (energy) <= ENERGY_MAX)
+
+DECLARE_ALIGNED(16, static const uint8_t, av1_all_zeros[MAX_SB_SIZE]) = { 0 };
+
+DECLARE_ALIGNED(16, static const uint16_t,
+ av1_highbd_all_zeros[MAX_SB_SIZE]) = { 0 };
+
+static const int segment_id[ENERGY_SPAN] = { 0, 1, 1, 2, 3, 4 };
+
+#define SEGMENT_ID(i) segment_id[(i)-ENERGY_MIN]
+
+void av1_vaq_frame_setup(AV1_COMP *cpi) {
+ AV1_COMMON *cm = &cpi->common;
+ struct segmentation *seg = &cm->seg;
+ int i;
+
+ int resolution_change =
+ cm->prev_frame && (cm->width != cm->prev_frame->width ||
+ cm->height != cm->prev_frame->height);
+ int avg_energy = (int)(cpi->twopass.mb_av_energy - 2);
+ double avg_ratio;
+ if (avg_energy > 7) avg_energy = 7;
+ if (avg_energy < 0) avg_energy = 0;
+ avg_ratio = rate_ratio[avg_energy];
+
+ if (resolution_change) {
+ memset(cpi->segmentation_map, 0, cm->mi_rows * cm->mi_cols);
+ av1_clearall_segfeatures(seg);
+ aom_clear_system_state();
+ av1_disable_segmentation(seg);
+ return;
+ }
+ if (frame_is_intra_only(cm) || cm->error_resilient_mode ||
+ cpi->refresh_alt_ref_frame ||
+ (cpi->refresh_golden_frame && !cpi->rc.is_src_frame_alt_ref)) {
+ cpi->vaq_refresh = 1;
+
+ av1_enable_segmentation(seg);
+ av1_clearall_segfeatures(seg);
+
+ aom_clear_system_state();
+
+ for (i = 0; i < MAX_SEGMENTS; ++i) {
+ // Set up avg segment id to be 1.0 and adjust the other segments around
+ // it.
+ int qindex_delta = av1_compute_qdelta_by_rate(
+ &cpi->rc, cm->frame_type, cm->base_qindex, rate_ratio[i] / avg_ratio,
+ cm->seq_params.bit_depth);
+
+ // We don't allow qindex 0 in a segment if the base value is not 0.
+ // Q index 0 (lossless) implies 4x4 encoding only and in AQ mode a segment
+ // Q delta is sometimes applied without going back around the rd loop.
+ // This could lead to an illegal combination of partition size and q.
+ if ((cm->base_qindex != 0) && ((cm->base_qindex + qindex_delta) == 0)) {
+ qindex_delta = -cm->base_qindex + 1;
+ }
+
+ av1_set_segdata(seg, i, SEG_LVL_ALT_Q, qindex_delta);
+ av1_enable_segfeature(seg, i, SEG_LVL_ALT_Q);
+ }
+ }
+}
+
+int av1_log_block_var(const AV1_COMP *cpi, MACROBLOCK *x, BLOCK_SIZE bs) {
+ // This functions returns a score for the blocks local variance as calculated
+ // by: sum of the log of the (4x4 variances) of each subblock to the current
+ // block (x,bs)
+ // * 32 / number of pixels in the block_size.
+ // This is used for segmentation because to avoid situations in which a large
+ // block with a gentle gradient gets marked high variance even though each
+ // subblock has a low variance. This allows us to assign the same segment
+ // number for the same sorts of area regardless of how the partitioning goes.
+
+ MACROBLOCKD *xd = &x->e_mbd;
+ double var = 0;
+ unsigned int sse;
+ int i, j;
+
+ int right_overflow =
+ (xd->mb_to_right_edge < 0) ? ((-xd->mb_to_right_edge) >> 3) : 0;
+ int bottom_overflow =
+ (xd->mb_to_bottom_edge < 0) ? ((-xd->mb_to_bottom_edge) >> 3) : 0;
+
+ const int bw = MI_SIZE * mi_size_wide[bs] - right_overflow;
+ const int bh = MI_SIZE * mi_size_high[bs] - bottom_overflow;
+
+ aom_clear_system_state();
+
+ for (i = 0; i < bh; i += 4) {
+ for (j = 0; j < bw; j += 4) {
+ if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
+ var +=
+ log(1.0 + cpi->fn_ptr[BLOCK_4X4].vf(
+ x->plane[0].src.buf + i * x->plane[0].src.stride + j,
+ x->plane[0].src.stride,
+ CONVERT_TO_BYTEPTR(av1_highbd_all_zeros), 0, &sse) /
+ 16);
+ } else {
+ var +=
+ log(1.0 + cpi->fn_ptr[BLOCK_4X4].vf(
+ x->plane[0].src.buf + i * x->plane[0].src.stride + j,
+ x->plane[0].src.stride, av1_all_zeros, 0, &sse) /
+ 16);
+ }
+ }
+ }
+ // Use average of 4x4 log variance. The range for 8 bit 0 - 9.704121561.
+ var /= (bw / 4 * bh / 4);
+ if (var > 7) var = 7;
+
+ aom_clear_system_state();
+ return (int)(var);
+}
+
+#define DEFAULT_E_MIDPOINT 10.0
+
+unsigned int haar_ac_energy(MACROBLOCK *x, BLOCK_SIZE bs) {
+ MACROBLOCKD *xd = &x->e_mbd;
+ int stride = x->plane[0].src.stride;
+ uint8_t *buf = x->plane[0].src.buf;
+ const int bw = MI_SIZE * mi_size_wide[bs];
+ const int bh = MI_SIZE * mi_size_high[bs];
+ int hbd = xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH;
+
+ int var = 0;
+ for (int r = 0; r < bh; r += 8)
+ for (int c = 0; c < bw; c += 8) {
+ var += av1_haar_ac_sad_8x8_uint8_input(buf + c + r * stride, stride, hbd);
+ }
+
+ return (unsigned int)((uint64_t)var * 256) >> num_pels_log2_lookup[bs];
+}
+
+double av1_log_block_wavelet_energy(MACROBLOCK *x, BLOCK_SIZE bs) {
+ unsigned int haar_sad = haar_ac_energy(x, bs);
+ aom_clear_system_state();
+ return log(haar_sad + 1.0);
+}
+
+int av1_block_wavelet_energy_level(const AV1_COMP *cpi, MACROBLOCK *x,
+ BLOCK_SIZE bs) {
+ double energy, energy_midpoint;
+ aom_clear_system_state();
+ energy_midpoint = (cpi->oxcf.pass == 2) ? cpi->twopass.frame_avg_haar_energy
+ : DEFAULT_E_MIDPOINT;
+ energy = av1_log_block_wavelet_energy(x, bs) - energy_midpoint;
+ return clamp((int)round(energy), ENERGY_MIN, ENERGY_MAX);
+}
+
+int av1_compute_deltaq_from_energy_level(const AV1_COMP *const cpi,
+ int block_var_level) {
+ int rate_level;
+ const AV1_COMMON *const cm = &cpi->common;
+
+ if (DELTAQ_MODULATION == 1) {
+ ENERGY_IN_BOUNDS(block_var_level);
+ rate_level = SEGMENT_ID(block_var_level);
+ } else {
+ rate_level = block_var_level;
+ }
+ int qindex_delta = av1_compute_qdelta_by_rate(
+ &cpi->rc, cm->frame_type, cm->base_qindex, deltaq_rate_ratio[rate_level],
+ cm->seq_params.bit_depth);
+
+ if ((cm->base_qindex != 0) && ((cm->base_qindex + qindex_delta) == 0)) {
+ qindex_delta = -cm->base_qindex + 1;
+ }
+ return qindex_delta;
+}