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/*
* Copyright (c) 2017, 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 "av1/common/scan.h"
#include "av1/common/idct.h"
#include "av1/common/txb_common.h"
#include "av1/decoder/decodemv.h"
#include "av1/decoder/decodetxb.h"
#include "av1/decoder/dsubexp.h"
#define ACCT_STR __func__
static int read_golomb(MACROBLOCKD *xd, aom_reader *r) {
int x = 1;
int length = 0;
int i = 0;
while (!i) {
i = aom_read_bit(r, ACCT_STR);
++length;
if (length >= 32) {
aom_internal_error(xd->error_info, AOM_CODEC_CORRUPT_FRAME,
"Invalid length in read_golomb");
break;
}
}
for (i = 0; i < length - 1; ++i) {
x <<= 1;
x += aom_read_bit(r, ACCT_STR);
}
return x - 1;
}
uint8_t av1_read_coeffs_txb(const AV1_COMMON *const cm, MACROBLOCKD *xd,
aom_reader *r, int blk_row, int blk_col, int block,
int plane, tran_low_t *tcoeffs, TXB_CTX *txb_ctx,
TX_SIZE tx_size, int16_t *max_scan_line, int *eob) {
FRAME_COUNTS *counts = xd->counts;
TX_SIZE txs_ctx = get_txsize_context(tx_size);
PLANE_TYPE plane_type = get_plane_type(plane);
aom_prob *nz_map = cm->fc->nz_map[txs_ctx][plane_type];
aom_prob *eob_flag = cm->fc->eob_flag[txs_ctx][plane_type];
MB_MODE_INFO *mbmi = &xd->mi[0]->mbmi;
const int seg_eob = tx_size_2d[tx_size];
int c = 0;
int update_eob = -1;
const int16_t *const dequant = xd->plane[plane].seg_dequant[mbmi->segment_id];
const int shift = av1_get_tx_scale(tx_size);
const int bwl = b_width_log2_lookup[txsize_to_bsize[tx_size]] + 2;
const int height = tx_size_high[tx_size];
int cul_level = 0;
unsigned int(*nz_map_count)[SIG_COEF_CONTEXTS][2];
nz_map_count = (counts) ? &counts->nz_map[txs_ctx][plane_type] : NULL;
memset(tcoeffs, 0, sizeof(*tcoeffs) * seg_eob);
int all_zero =
aom_read(r, cm->fc->txb_skip[txs_ctx][txb_ctx->txb_skip_ctx], ACCT_STR);
if (xd->counts)
++xd->counts->txb_skip[txs_ctx][txb_ctx->txb_skip_ctx][all_zero];
*eob = 0;
if (all_zero) {
*max_scan_line = 0;
#if CONFIG_TXK_SEL
if (plane == 0) mbmi->txk_type[(blk_row << 4) + blk_col] = DCT_DCT;
#endif
return 0;
}
(void)blk_row;
(void)blk_col;
#if CONFIG_TXK_SEL
av1_read_tx_type(cm, xd, blk_row, blk_col, block, plane,
get_min_tx_size(tx_size), r);
#endif
const TX_TYPE tx_type =
av1_get_tx_type(plane_type, xd, blk_row, blk_col, block, tx_size);
const SCAN_ORDER *const scan_order = get_scan(cm, tx_size, tx_type, mbmi);
const int16_t *scan = scan_order->scan;
const int16_t *iscan = scan_order->iscan;
for (c = 0; c < seg_eob; ++c) {
int is_nz;
int coeff_ctx = get_nz_map_ctx(tcoeffs, scan[c], bwl, height, iscan);
int eob_ctx = get_eob_ctx(tcoeffs, scan[c], txs_ctx);
if (c < seg_eob - 1)
is_nz = aom_read(r, nz_map[coeff_ctx], ACCT_STR);
else
is_nz = 1;
// set non-zero coefficient map.
tcoeffs[scan[c]] = is_nz;
if (c == seg_eob - 1) {
++c;
break;
}
if (counts) ++(*nz_map_count)[coeff_ctx][is_nz];
if (is_nz) {
int is_eob = aom_read(r, eob_flag[eob_ctx], ACCT_STR);
if (counts) ++counts->eob_flag[txs_ctx][plane_type][eob_ctx][is_eob];
if (is_eob) break;
}
}
*eob = AOMMIN(seg_eob, c + 1);
*max_scan_line = *eob;
int i;
for (i = 0; i < NUM_BASE_LEVELS; ++i) {
aom_prob *coeff_base = cm->fc->coeff_base[txs_ctx][plane_type][i];
update_eob = 0;
for (c = *eob - 1; c >= 0; --c) {
tran_low_t *v = &tcoeffs[scan[c]];
int sign;
int ctx;
if (*v <= i) continue;
ctx = get_base_ctx(tcoeffs, scan[c], bwl, height, i + 1);
if (aom_read(r, coeff_base[ctx], ACCT_STR)) {
*v = i + 1;
cul_level += i + 1;
if (counts) ++counts->coeff_base[txs_ctx][plane_type][i][ctx][1];
if (c == 0) {
int dc_sign_ctx = txb_ctx->dc_sign_ctx;
sign =
aom_read(r, cm->fc->dc_sign[plane_type][dc_sign_ctx], ACCT_STR);
if (counts) ++counts->dc_sign[plane_type][dc_sign_ctx][sign];
} else {
sign = aom_read_bit(r, ACCT_STR);
}
if (sign) *v = -(*v);
continue;
}
*v = i + 2;
if (counts) ++counts->coeff_base[txs_ctx][plane_type][i][ctx][0];
// update the eob flag for coefficients with magnitude above 1.
update_eob = AOMMAX(update_eob, c);
}
}
for (c = update_eob; c >= 0; --c) {
tran_low_t *v = &tcoeffs[scan[c]];
int sign;
int idx;
int ctx;
if (*v <= NUM_BASE_LEVELS) continue;
if (c == 0) {
int dc_sign_ctx = txb_ctx->dc_sign_ctx;
sign = aom_read(r, cm->fc->dc_sign[plane_type][dc_sign_ctx], ACCT_STR);
if (counts) ++counts->dc_sign[plane_type][dc_sign_ctx][sign];
} else {
sign = aom_read_bit(r, ACCT_STR);
}
ctx = get_br_ctx(tcoeffs, scan[c], bwl, height);
if (cm->fc->coeff_lps[txs_ctx][plane_type][ctx] == 0) exit(0);
for (idx = 0; idx < COEFF_BASE_RANGE; ++idx) {
if (aom_read(r, cm->fc->coeff_lps[txs_ctx][plane_type][ctx], ACCT_STR)) {
*v = (idx + 1 + NUM_BASE_LEVELS);
if (sign) *v = -(*v);
cul_level += abs(*v);
if (counts) ++counts->coeff_lps[txs_ctx][plane_type][ctx][1];
break;
}
if (counts) ++counts->coeff_lps[txs_ctx][plane_type][ctx][0];
}
if (idx < COEFF_BASE_RANGE) continue;
// decode 0-th order Golomb code
*v = read_golomb(xd, r) + COEFF_BASE_RANGE + 1 + NUM_BASE_LEVELS;
if (sign) *v = -(*v);
cul_level += abs(*v);
}
for (c = 0; c < *eob; ++c) {
int16_t dqv = (c == 0) ? dequant[0] : dequant[1];
tran_low_t *v = &tcoeffs[scan[c]];
int sign = (*v) < 0;
*v = (abs(*v) * dqv) >> shift;
if (sign) *v = -(*v);
}
cul_level = AOMMIN(63, cul_level);
// DC value
set_dc_sign(&cul_level, tcoeffs[0]);
return cul_level;
}
uint8_t av1_read_coeffs_txb_facade(AV1_COMMON *cm, MACROBLOCKD *xd,
aom_reader *r, int row, int col, int block,
int plane, tran_low_t *tcoeffs,
TX_SIZE tx_size, int16_t *max_scan_line,
int *eob) {
MB_MODE_INFO *mbmi = &xd->mi[0]->mbmi;
struct macroblockd_plane *pd = &xd->plane[plane];
const BLOCK_SIZE bsize = mbmi->sb_type;
#if CONFIG_CHROMA_SUB8X8
const BLOCK_SIZE plane_bsize =
AOMMAX(BLOCK_4X4, get_plane_block_size(bsize, pd));
#elif CONFIG_CB4X4
const BLOCK_SIZE plane_bsize = get_plane_block_size(bsize, pd);
#else // CONFIG_CB4X4
const BLOCK_SIZE plane_bsize =
get_plane_block_size(AOMMAX(BLOCK_8X8, bsize), pd);
#endif // CONFIG_CB4X4
TXB_CTX txb_ctx;
get_txb_ctx(plane_bsize, tx_size, plane, pd->above_context + col,
pd->left_context + row, &txb_ctx);
uint8_t cul_level =
av1_read_coeffs_txb(cm, xd, r, row, col, block, plane, tcoeffs, &txb_ctx,
tx_size, max_scan_line, eob);
#if CONFIG_ADAPT_SCAN
PLANE_TYPE plane_type = get_plane_type(plane);
TX_TYPE tx_type = av1_get_tx_type(plane_type, xd, row, col, block, tx_size);
if (xd->counts && *eob > 0)
av1_update_scan_count_facade(cm, xd->counts, tx_size, tx_type, pd->dqcoeff,
*eob);
#endif
av1_set_contexts(xd, pd, plane, tx_size, cul_level, col, row);
return cul_level;
}
static void read_txb_probs(FRAME_CONTEXT *fc, const TX_SIZE tx_size,
aom_reader *r) {
int plane, ctx, level;
if (aom_read_bit(r, ACCT_STR) == 0) return;
for (ctx = 0; ctx < TXB_SKIP_CONTEXTS; ++ctx)
av1_diff_update_prob(r, &fc->txb_skip[tx_size][ctx], ACCT_STR);
for (plane = 0; plane < PLANE_TYPES; ++plane)
for (ctx = 0; ctx < SIG_COEF_CONTEXTS; ++ctx)
av1_diff_update_prob(r, &fc->nz_map[tx_size][plane][ctx], ACCT_STR);
for (plane = 0; plane < PLANE_TYPES; ++plane)
for (ctx = 0; ctx < EOB_COEF_CONTEXTS; ++ctx)
av1_diff_update_prob(r, &fc->eob_flag[tx_size][plane][ctx], ACCT_STR);
for (level = 0; level < NUM_BASE_LEVELS; ++level)
for (plane = 0; plane < PLANE_TYPES; ++plane)
for (ctx = 0; ctx < COEFF_BASE_CONTEXTS; ++ctx)
av1_diff_update_prob(r, &fc->coeff_base[tx_size][plane][level][ctx],
ACCT_STR);
for (plane = 0; plane < PLANE_TYPES; ++plane)
for (ctx = 0; ctx < LEVEL_CONTEXTS; ++ctx)
av1_diff_update_prob(r, &fc->coeff_lps[tx_size][plane][ctx], ACCT_STR);
}
void av1_read_txb_probs(FRAME_CONTEXT *fc, TX_MODE tx_mode, aom_reader *r) {
const TX_SIZE max_tx_size = tx_mode_to_biggest_tx_size[tx_mode];
TX_SIZE tx_size;
int ctx, plane;
for (plane = 0; plane < PLANE_TYPES; ++plane)
for (ctx = 0; ctx < DC_SIGN_CONTEXTS; ++ctx)
av1_diff_update_prob(r, &fc->dc_sign[plane][ctx], ACCT_STR);
for (tx_size = TX_4X4; tx_size <= max_tx_size; ++tx_size)
read_txb_probs(fc, tx_size, r);
}