Commit cea11f2a authored by Angie Chiang's avatar Angie Chiang

Add transform coefficient decode function

Change-Id: I222b5ce9ee1a1c1aac5620b94835967dd9a014c1
parent 8cf83640
......@@ -23,6 +23,8 @@ AV1_DX_SRCS-yes += decoder/decodeframe.c
AV1_DX_SRCS-yes += decoder/decodeframe.h
AV1_DX_SRCS-yes += decoder/detokenize.c
AV1_DX_SRCS-yes += decoder/decodemv.h
AV1_DX_SRCS-$(CONFIG_LV_MAP) += decoder/decodetxb.c
AV1_DX_SRCS-$(CONFIG_LV_MAP) += decoder/decodetxb.h
AV1_DX_SRCS-yes += decoder/detokenize.h
AV1_DX_SRCS-yes += decoder/dthread.c
AV1_DX_SRCS-yes += decoder/dthread.h
......
......@@ -95,6 +95,11 @@ static int16_t coeff_band_32x32[1024] = {
22, 23, 23, 23, 23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24,
};
typedef struct txb_ctx {
int txb_skip_ctx;
int dc_sign_ctx;
} TXB_CTX;
#define BASE_CONTEXT_POSITION_NUM 12
static int base_ref_offset[BASE_CONTEXT_POSITION_NUM][2] = {
/* clang-format off*/
......@@ -296,4 +301,10 @@ static INLINE int get_eob_ctx(const tran_low_t *tcoeffs,
exit(0);
}
static INLINE void set_dc_sign(int *cul_level, tran_low_t v) {
if (v < 0)
*cul_level |= 1 << COEFF_CONTEXT_BITS;
else if (v > 0)
*cul_level += 2 << COEFF_CONTEXT_BITS;
}
#endif // AV1_COMMON_TXB_COMMON_H_
/*
* 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/txb_common.h"
#include "av1/decoder/decodetxb.h"
#define ACCT_STR __func__
static int read_golomb(aom_reader *r) {
int x = 1;
int length = 0;
int i = 0;
while (!i) {
i = aom_read_bit(r, ACCT_STR);
++length;
}
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 block, int plane,
tran_low_t *tcoeffs, TXB_CTX *txb_ctx) {
FRAME_COUNTS *counts = xd->counts;
TX_SIZE tx_size = get_tx_size(plane, xd, block);
PLANE_TYPE plane_type = get_plane_type(plane);
aom_prob *nz_map = cm->fc->nz_map[tx_size][plane_type];
aom_prob *eob_flag = cm->fc->eob_flag[tx_size][plane_type];
MB_MODE_INFO *mbmi = &xd->mi[0]->mbmi;
const TX_TYPE tx_type = get_tx_type(plane_type, xd, block, tx_size);
const SCAN_ORDER *const scan_order =
get_scan(cm, tx_size, tx_type, is_inter_block(mbmi));
const int16_t *scan = scan_order->scan;
const int seg_eob = 16 << (tx_size << 1);
int c = 0;
int eob = 0, update_eob = -1;
const int16_t *const dequant = xd->plane[plane].seg_dequant[mbmi->segment_id];
const int shift = (tx_size == TX_32X32);
const int bwl = b_width_log2_lookup[txsize_to_bsize[tx_size]] + 2;
int cul_level = 0;
unsigned int(*nz_map_count)[SIG_COEF_CONTEXTS][2];
uint8_t txb_mask[32 * 32] = { 0 };
nz_map_count = (counts) ? &counts->nz_map[tx_size][plane_type] : NULL;
memset(tcoeffs, 0, sizeof(*tcoeffs) * seg_eob);
for (c = 0; c < seg_eob; ++c) {
int is_nz;
int coeff_ctx = get_nz_map_ctx(tcoeffs, txb_mask, scan[c], bwl);
int eob_ctx = get_eob_ctx(tcoeffs, scan[c], bwl);
if (c < seg_eob - 1)
is_nz = aom_read(r, nz_map[coeff_ctx], tx_size);
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], tx_size);
if (counts) ++counts->eob_flag[tx_size][plane_type][eob_ctx][is_eob];
if (is_eob) break;
}
txb_mask[scan[c]] = 1;
}
eob = AOMMIN(seg_eob, c + 1);
int i;
for (i = 0; i < NUM_BASE_LEVELS; ++i) {
aom_prob *coeff_base = cm->fc->coeff_base[tx_size][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, i + 1);
if (aom_read(r, coeff_base[ctx], tx_size)) {
*v = i + 1;
cul_level += i + 1;
if (counts) ++counts->coeff_base[tx_size][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], tx_size);
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[tx_size][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], tx_size);
if (counts) ++counts->dc_sign[plane_type][dc_sign_ctx][sign];
} else {
sign = aom_read_bit(r, ACCT_STR);
}
ctx = get_level_ctx(tcoeffs, scan[c], bwl);
if (cm->fc->coeff_lps[tx_size][plane_type][ctx] == 0) exit(0);
for (idx = 0; idx < COEFF_BASE_RANGE; ++idx) {
if (aom_read(r, cm->fc->coeff_lps[tx_size][plane_type][ctx], tx_size)) {
*v = (idx + 1 + NUM_BASE_LEVELS);
if (sign) *v = -(*v);
cul_level += abs(*v);
if (counts) ++counts->coeff_lps[tx_size][plane_type][ctx][1];
break;
}
if (counts) ++counts->coeff_lps[tx_size][plane_type][ctx][0];
}
if (idx < COEFF_BASE_RANGE) continue;
// decode 0-th order Golomb code
*v = read_golomb(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;
}
/*
* 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.
*/
#ifndef DECODETXB_H_
#define DECODETXB_H_
#include "./aom_config.h"
#include "av1/common/blockd.h"
#include "av1/common/onyxc_int.h"
#include "av1/common/txb_common.h"
#include "aom_dsp/bitreader.h"
uint8_t av1_read_coeffs_txb(const AV1_COMMON *const cm, MACROBLOCKD *xd,
aom_reader *r, int block, int plane,
tran_low_t *tcoeffs, TXB_CTX *txb_ctx);
#endif // DECODETXB_H_
......@@ -10,7 +10,6 @@
*/
#include "av1/common/scan.h"
#include "av1/common/txb_common.h"
#include "av1/encoder/encodetxb.h"
static void write_golomb(aom_writer *w, int level) {
......@@ -36,7 +35,7 @@ void av1_write_coeffs_txb(const AV1_COMMON *const cm, MACROBLOCKD *xd,
aom_prob *nz_map;
aom_prob *eob_flag;
MB_MODE_INFO *mbmi = &xd->mi[0]->mbmi;
const PLANE_TYPE plane_type = (plane == 0) ? PLANE_TYPE_Y : PLANE_TYPE_UV;
const PLANE_TYPE plane_type = get_plane_type(plane);
const TX_SIZE tx_size = get_tx_size(plane, xd, block);
const TX_TYPE tx_type = get_tx_type(plane_type, xd, block, tx_size);
const SCAN_ORDER *const scan_order =
......
......@@ -15,16 +15,12 @@
#include "./aom_config.h"
#include "av1/common/blockd.h"
#include "av1/common/onyxc_int.h"
#include "av1/common/txb_common.h"
#include "aom_dsp/bitwriter.h"
#ifdef __cplusplus
extern "C" {
#endif
typedef struct txb_ctx {
int txb_skip_ctx;
int dc_sign_ctx;
} TXB_CTX;
void av1_write_coeffs_txb(const AV1_COMMON *const cm, MACROBLOCKD *xd,
aom_writer *w, int block, int plane,
const tran_low_t *tcoeff, uint16_t eob,
......
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