257 строки
8.4 KiB
C
257 строки
8.4 KiB
C
/*
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* Copyright (c) 2001-2016, Alliance for Open Media. All rights reserved
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*
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* This source code is subject to the terms of the BSD 2 Clause License and
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* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
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* was not distributed with this source code in the LICENSE file, you can
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* obtain it at www.aomedia.org/license/software. If the Alliance for Open
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* Media Patent License 1.0 was not distributed with this source code in the
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* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
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*/
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/* clang-format off */
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include "enums.h"
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#include "odintrin.h"
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#include "partition.h"
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#include "zigzag.h"
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OD_EXTERN const index_pair *OD_ZIGZAG4[4] = {
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OD_ZIGZAG4_DCT_DCT,
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OD_ZIGZAG4_ADST_DCT,
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OD_ZIGZAG4_DCT_ADST,
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OD_ZIGZAG4_ADST_ADST
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};
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OD_EXTERN const index_pair *OD_ZIGZAG8[4] = {
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OD_ZIGZAG8_DCT_DCT,
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OD_ZIGZAG8_ADST_DCT,
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OD_ZIGZAG8_DCT_ADST,
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OD_ZIGZAG8_ADST_ADST
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};
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OD_EXTERN const index_pair *OD_ZIGZAG16[4] = {
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OD_ZIGZAG16_DCT_DCT,
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OD_ZIGZAG16_ADST_DCT,
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OD_ZIGZAG16_DCT_ADST,
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OD_ZIGZAG16_ADST_ADST
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};
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OD_EXTERN const index_pair *OD_ZIGZAG32[4] = {
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OD_ZIGZAG32_DCT_DCT,
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OD_ZIGZAG32_DCT_DCT,
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OD_ZIGZAG32_DCT_DCT,
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OD_ZIGZAG32_DCT_DCT
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};
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/* The tables below specify how coefficient blocks are translated to
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and from PVQ partition coding scan order for 4x4, 8x8 and 16x16 */
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static const int OD_LAYOUT32_OFFSETS[4] = { 0, 128, 256, 768 };
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const band_layout OD_LAYOUT32 = {
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OD_ZIGZAG32,
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32,
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3,
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OD_LAYOUT32_OFFSETS
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};
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static const int OD_LAYOUT16_OFFSETS[4] = { 0, 32, 64, 192 };
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const band_layout OD_LAYOUT16 = {
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OD_ZIGZAG16,
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16,
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3,
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OD_LAYOUT16_OFFSETS
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};
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const int OD_LAYOUT8_OFFSETS[4] = { 0, 8, 16, 48 };
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const band_layout OD_LAYOUT8 = {
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OD_ZIGZAG8,
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8,
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3,
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OD_LAYOUT8_OFFSETS
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};
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static const int OD_LAYOUT4_OFFSETS[2] = { 0, 15 };
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const band_layout OD_LAYOUT4 = {
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OD_ZIGZAG4,
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4,
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1,
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OD_LAYOUT4_OFFSETS
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};
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/* First element is the number of bands, followed by the list all the band
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boundaries. */
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static const int OD_BAND_OFFSETS4[] = {1, 1, 16};
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static const int OD_BAND_OFFSETS8[] = {4, 1, 16, 24, 32, 64};
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static const int OD_BAND_OFFSETS16[] = {7, 1, 16, 24, 32, 64, 96, 128, 256};
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static const int OD_BAND_OFFSETS32[] = {10, 1, 16, 24, 32, 64, 96, 128, 256,
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384, 512, 1024};
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static const int OD_BAND_OFFSETS64[] = {13, 1, 16, 24, 32, 64, 96, 128, 256,
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384, 512, 1024, 1536, 2048, 4096};
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const int *const OD_BAND_OFFSETS[OD_TXSIZES + 1] = {
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OD_BAND_OFFSETS4,
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OD_BAND_OFFSETS8,
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OD_BAND_OFFSETS16,
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OD_BAND_OFFSETS32,
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OD_BAND_OFFSETS64
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};
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/** Perform a single stage of conversion from a coefficient block in
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* raster order into coding scan order
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*
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* @param [in] layout scan order specification
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* @param [out] dst destination vector
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* @param [in] src source coefficient block
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* @param [int] int source vector row stride
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*/
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static void od_band_from_raster(const band_layout *layout, tran_low_t *dst,
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const tran_low_t *src, int stride, TX_TYPE tx_type) {
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int i;
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int len;
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len = layout->band_offsets[layout->nb_bands];
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for (i = 0; i < len; i++) {
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dst[i] = src[layout->dst_table[tx_type][i][1]*stride + layout->dst_table[tx_type][i][0]];
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}
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}
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/** Perform a single stage of conversion from a vector in coding scan
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order back into a coefficient block in raster order
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*
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* @param [in] layout scan order specification
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* @param [out] dst destination coefficient block
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* @param [in] src source vector
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* @param [int] stride destination vector row stride
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*/
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static void od_raster_from_band(const band_layout *layout, tran_low_t *dst,
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int stride, TX_TYPE tx_type, const tran_low_t *src) {
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int i;
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int len;
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len = layout->band_offsets[layout->nb_bands];
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for (i = 0; i < len; i++) {
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dst[layout->dst_table[tx_type][i][1]*stride + layout->dst_table[tx_type][i][0]] = src[i];
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}
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}
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static const band_layout *const OD_LAYOUTS[] = {&OD_LAYOUT4, &OD_LAYOUT8,
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&OD_LAYOUT16, &OD_LAYOUT32};
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/** Converts a coefficient block in raster order into a vector in
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* coding scan order with the PVQ partitions laid out one after
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* another. This works in stages; the 4x4 conversion is applied to
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* the coefficients nearest DC, then the 8x8 applied to the 8x8 block
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* nearest DC that was not already coded by 4x4, then 16x16 following
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* the same pattern.
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*
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* @param [out] dst destination vector
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* @param [in] n block size (along one side)
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* @param [in] ty_type transfrom type
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* @param [in] src source coefficient block
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* @param [in] stride source vector row stride
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*/
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void od_raster_to_coding_order(tran_low_t *dst, int n, TX_TYPE ty_type,
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const tran_low_t *src, int stride) {
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int bs;
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/* dst + 1 because DC is not included for 4x4 blocks. */
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od_band_from_raster(OD_LAYOUTS[0], dst + 1, src, stride, ty_type);
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for (bs = 1; bs < OD_TXSIZES; bs++) {
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int size;
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int offset;
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/* Length of block size > 4. */
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size = 1 << (OD_LOG_BSIZE0 + bs);
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/* Offset is the size of the previous block squared. */
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offset = 1 << 2*(OD_LOG_BSIZE0 - 1 + bs);
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if (n >= size) {
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/* 3 16x16 bands come after 3 8x8 bands, which come after 2 4x4 bands. */
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od_band_from_raster(OD_LAYOUTS[bs], dst + offset, src, stride, ty_type);
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}
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}
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dst[0] = src[0];
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}
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/** Converts a vector in coding scan order witht he PVQ partitions
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* laid out one after another into a coefficient block in raster
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* order. This works in stages in the reverse order of raster->scan
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* order; the 16x16 conversion is applied to the coefficients that
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* don't appear in an 8x8 block, then the 8x8 applied to the 8x8 block
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* sans the 4x4 block it contains, then 4x4 is converted sans DC.
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*
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* @param [out] dst destination coefficient block
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* @param [in] stride destination vector row stride
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* @param [in] src source vector
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* @param [in] n block size (along one side)
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*/
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void od_coding_order_to_raster(tran_low_t *dst, int stride, TX_TYPE ty_type,
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const tran_low_t *src, int n) {
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int bs;
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/* src + 1 because DC is not included for 4x4 blocks. */
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od_raster_from_band(OD_LAYOUTS[0], dst, stride, ty_type, src + 1);
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for (bs = 1; bs < OD_TXSIZES; bs++) {
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int size;
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int offset;
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/* Length of block size > 4 */
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size = 1 << (OD_LOG_BSIZE0 + bs);
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/* Offset is the size of the previous block squared. */
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offset = 1 << 2*(OD_LOG_BSIZE0 - 1 + bs);
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if (n >= size) {
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/* 3 16x16 bands come after 3 8x8 bands, which come after 2 4x4 bands. */
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od_raster_from_band(OD_LAYOUTS[bs], dst, stride, ty_type, src + offset);
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}
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}
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dst[0] = src[0];
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}
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/** Perform a single stage of conversion from a coefficient block in
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* raster order into coding scan order
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*
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* @param [in] layout scan order specification
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* @param [out] dst destination vector
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* @param [in] src source coefficient block
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* @param [int] int source vector row stride
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*/
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static void od_band_from_raster_16(const band_layout *layout, int16_t *dst,
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const int16_t *src, int stride) {
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int i;
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int len;
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len = layout->band_offsets[layout->nb_bands];
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for (i = 0; i < len; i++) {
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dst[i] = src[layout->dst_table[DCT_DCT][i][1]*stride + layout->dst_table[DCT_DCT][i][0]];
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}
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}
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/** Converts a coefficient block in raster order into a vector in
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* coding scan order with the PVQ partitions laid out one after
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* another. This works in stages; the 4x4 conversion is applied to
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* the coefficients nearest DC, then the 8x8 applied to the 8x8 block
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* nearest DC that was not already coded by 4x4, then 16x16 following
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* the same pattern.
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*
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* @param [out] dst destination vector
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* @param [in] n block size (along one side)
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* @param [in] src source coefficient block
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* @param [in] stride source vector row stride
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*/
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void od_raster_to_coding_order_16(int16_t *dst, int n, const int16_t *src,
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int stride) {
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int bs;
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/* dst + 1 because DC is not included for 4x4 blocks. */
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od_band_from_raster_16(OD_LAYOUTS[0], dst + 1, src, stride);
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for (bs = 1; bs < OD_TXSIZES; bs++) {
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int size;
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int offset;
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/* Length of block size > 4. */
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size = 1 << (OD_LOG_BSIZE0 + bs);
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/* Offset is the size of the previous block squared. */
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offset = 1 << 2*(OD_LOG_BSIZE0 - 1 + bs);
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if (n >= size) {
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/* 3 16x16 bands come after 3 8x8 bands, which come after 2 4x4 bands. */
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od_band_from_raster_16(OD_LAYOUTS[bs], dst + offset, src, stride);
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}
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}
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dst[0] = src[0];
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}
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