mirror of
https://github.com/FFmpeg/FFmpeg.git
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843 lines
27 KiB
C
843 lines
27 KiB
C
/*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* @brief IntraX8 (J-Frame) subdecoder, used by WMV2 and VC-1
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*/
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#include "avcodec.h"
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#include "get_bits.h"
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#include "idctdsp.h"
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#include "msmpeg4data.h"
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#include "intrax8huf.h"
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#include "intrax8.h"
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#include "intrax8dsp.h"
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#include "mpegutils.h"
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#define MAX_TABLE_DEPTH(table_bits, max_bits) \
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((max_bits + table_bits - 1) / table_bits)
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#define DC_VLC_BITS 9
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#define AC_VLC_BITS 9
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#define OR_VLC_BITS 7
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#define DC_VLC_MTD MAX_TABLE_DEPTH(DC_VLC_BITS, MAX_DC_VLC_BITS)
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#define AC_VLC_MTD MAX_TABLE_DEPTH(AC_VLC_BITS, MAX_AC_VLC_BITS)
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#define OR_VLC_MTD MAX_TABLE_DEPTH(OR_VLC_BITS, MAX_OR_VLC_BITS)
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static VLC j_ac_vlc[2][2][8]; // [quant < 13], [intra / inter], [select]
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static VLC j_dc_vlc[2][8]; // [quant], [select]
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static VLC j_orient_vlc[2][4]; // [quant], [select]
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static av_cold int x8_vlc_init(void)
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{
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int i;
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int offset = 0;
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int sizeidx = 0;
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static const uint16_t sizes[8 * 4 + 8 * 2 + 2 + 4] = {
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576, 548, 582, 618, 546, 616, 560, 642,
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584, 582, 704, 664, 512, 544, 656, 640,
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512, 648, 582, 566, 532, 614, 596, 648,
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586, 552, 584, 590, 544, 578, 584, 624,
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528, 528, 526, 528, 536, 528, 526, 544,
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544, 512, 512, 528, 528, 544, 512, 544,
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128, 128, 128, 128, 128, 128,
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};
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static VLC_TYPE table[28150][2];
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// set ac tables
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#define init_ac_vlc(dst, src) \
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do { \
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dst.table = &table[offset]; \
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dst.table_allocated = sizes[sizeidx]; \
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offset += sizes[sizeidx++]; \
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init_vlc(&dst, AC_VLC_BITS, 77, &src[1], 4, 2, &src[0], 4, 2, \
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INIT_VLC_USE_NEW_STATIC); \
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} while(0)
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for (i = 0; i < 8; i++) {
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init_ac_vlc(j_ac_vlc[0][0][i], x8_ac0_highquant_table[i][0]);
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init_ac_vlc(j_ac_vlc[0][1][i], x8_ac1_highquant_table[i][0]);
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init_ac_vlc(j_ac_vlc[1][0][i], x8_ac0_lowquant_table[i][0]);
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init_ac_vlc(j_ac_vlc[1][1][i], x8_ac1_lowquant_table[i][0]);
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}
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#undef init_ac_vlc
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// set dc tables
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#define init_dc_vlc(dst, src) \
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do { \
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dst.table = &table[offset]; \
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dst.table_allocated = sizes[sizeidx]; \
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offset += sizes[sizeidx++]; \
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init_vlc(&dst, DC_VLC_BITS, 34, &src[1], 4, 2, &src[0], 4, 2, \
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INIT_VLC_USE_NEW_STATIC); \
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} while(0)
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for (i = 0; i < 8; i++) {
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init_dc_vlc(j_dc_vlc[0][i], x8_dc_highquant_table[i][0]);
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init_dc_vlc(j_dc_vlc[1][i], x8_dc_lowquant_table[i][0]);
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}
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#undef init_dc_vlc
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// set orient tables
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#define init_or_vlc(dst, src) \
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do { \
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dst.table = &table[offset]; \
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dst.table_allocated = sizes[sizeidx]; \
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offset += sizes[sizeidx++]; \
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init_vlc(&dst, OR_VLC_BITS, 12, &src[1], 4, 2, &src[0], 4, 2, \
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INIT_VLC_USE_NEW_STATIC); \
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} while(0)
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for (i = 0; i < 2; i++)
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init_or_vlc(j_orient_vlc[0][i], x8_orient_highquant_table[i][0]);
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for (i = 0; i < 4; i++)
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init_or_vlc(j_orient_vlc[1][i], x8_orient_lowquant_table[i][0]);
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#undef init_or_vlc
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if (offset != sizeof(table) / sizeof(VLC_TYPE) / 2) {
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av_log(NULL, AV_LOG_ERROR, "table size %zd does not match needed %i\n",
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sizeof(table) / sizeof(VLC_TYPE) / 2, offset);
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return AVERROR_INVALIDDATA;
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}
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return 0;
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}
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static void x8_reset_vlc_tables(IntraX8Context *w)
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{
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memset(w->j_dc_vlc, 0, sizeof(w->j_dc_vlc));
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memset(w->j_ac_vlc, 0, sizeof(w->j_ac_vlc));
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w->j_orient_vlc = NULL;
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}
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static inline void x8_select_ac_table(IntraX8Context *const w, int mode)
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{
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int table_index;
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assert(mode < 4);
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if (w->j_ac_vlc[mode])
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return;
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table_index = get_bits(w->gb, 3);
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// 2 modes use same tables
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w->j_ac_vlc[mode] = &j_ac_vlc[w->quant < 13][mode >> 1][table_index];
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assert(w->j_ac_vlc[mode]);
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}
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static inline int x8_get_orient_vlc(IntraX8Context *w)
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{
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if (!w->j_orient_vlc) {
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int table_index = get_bits(w->gb, 1 + (w->quant < 13));
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w->j_orient_vlc = &j_orient_vlc[w->quant < 13][table_index];
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}
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assert(w->j_orient_vlc);
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assert(w->j_orient_vlc->table);
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return get_vlc2(w->gb, w->j_orient_vlc->table, OR_VLC_BITS, OR_VLC_MTD);
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}
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#define extra_bits(eb) (eb) // 3 bits
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#define extra_run (0xFF << 8) // 1 bit
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#define extra_level (0x00 << 8) // 1 bit
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#define run_offset(r) ((r) << 16) // 6 bits
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#define level_offset(l) ((l) << 24) // 5 bits
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static const uint32_t ac_decode_table[] = {
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/* 46 */ extra_bits(3) | extra_run | run_offset(16) | level_offset(0),
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/* 47 */ extra_bits(3) | extra_run | run_offset(24) | level_offset(0),
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/* 48 */ extra_bits(2) | extra_run | run_offset(4) | level_offset(1),
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/* 49 */ extra_bits(3) | extra_run | run_offset(8) | level_offset(1),
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/* 50 */ extra_bits(5) | extra_run | run_offset(32) | level_offset(0),
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/* 51 */ extra_bits(4) | extra_run | run_offset(16) | level_offset(1),
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/* 52 */ extra_bits(2) | extra_level | run_offset(0) | level_offset(4),
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/* 53 */ extra_bits(2) | extra_level | run_offset(0) | level_offset(8),
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/* 54 */ extra_bits(2) | extra_level | run_offset(0) | level_offset(12),
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/* 55 */ extra_bits(3) | extra_level | run_offset(0) | level_offset(16),
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/* 56 */ extra_bits(3) | extra_level | run_offset(0) | level_offset(24),
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/* 57 */ extra_bits(2) | extra_level | run_offset(1) | level_offset(3),
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/* 58 */ extra_bits(3) | extra_level | run_offset(1) | level_offset(7),
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/* 59 */ extra_bits(2) | extra_run | run_offset(16) | level_offset(0),
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/* 60 */ extra_bits(2) | extra_run | run_offset(20) | level_offset(0),
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/* 61 */ extra_bits(2) | extra_run | run_offset(24) | level_offset(0),
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/* 62 */ extra_bits(2) | extra_run | run_offset(28) | level_offset(0),
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/* 63 */ extra_bits(4) | extra_run | run_offset(32) | level_offset(0),
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/* 64 */ extra_bits(4) | extra_run | run_offset(48) | level_offset(0),
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/* 65 */ extra_bits(2) | extra_run | run_offset(4) | level_offset(1),
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/* 66 */ extra_bits(3) | extra_run | run_offset(8) | level_offset(1),
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/* 67 */ extra_bits(4) | extra_run | run_offset(16) | level_offset(1),
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/* 68 */ extra_bits(2) | extra_level | run_offset(0) | level_offset(4),
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/* 69 */ extra_bits(3) | extra_level | run_offset(0) | level_offset(8),
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/* 70 */ extra_bits(4) | extra_level | run_offset(0) | level_offset(16),
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/* 71 */ extra_bits(2) | extra_level | run_offset(1) | level_offset(3),
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/* 72 */ extra_bits(3) | extra_level | run_offset(1) | level_offset(7),
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};
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#undef extra_bits
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#undef extra_run
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#undef extra_level
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#undef run_offset
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#undef level_offset
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static void x8_get_ac_rlf(IntraX8Context *const w, const int mode,
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int *const run, int *const level, int *const final)
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{
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int i, e;
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// x8_select_ac_table(w, mode);
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i = get_vlc2(w->gb, w->j_ac_vlc[mode]->table, AC_VLC_BITS, AC_VLC_MTD);
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if (i < 46) { // [0-45]
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int t, l;
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if (i < 0) {
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*level =
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*final = // prevent 'may be used uninitialized'
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*run = 64; // this would cause error exit in the ac loop
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return;
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}
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/*
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* i == 0-15 r = 0-15 l = 0; r = i & %01111
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* i == 16-19 r = 0-3 l = 1; r = i & %00011
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* i == 20-21 r = 0-1 l = 2; r = i & %00001
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* i == 22 r = 0 l = 3; r = i & %00000
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*/
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*final =
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t = i > 22;
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i -= 23 * t;
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/* l = lut_l[i / 2] = { 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 3 }[i >> 1];
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* 11 10'01 01'00 00'00 00'00 00'00 00 => 0xE50000 */
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l = (0xE50000 >> (i & 0x1E)) & 3; // 0x1E or ~1 or (i >> 1 << 1)
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/* t = lut_mask[l] = { 0x0f, 0x03, 0x01, 0x00 }[l];
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* as i < 256 the higher bits do not matter */
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t = 0x01030F >> (l << 3);
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*run = i & t;
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*level = l;
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} else if (i < 73) { // [46-72]
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uint32_t sm;
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uint32_t mask;
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i -= 46;
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sm = ac_decode_table[i];
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e = get_bits(w->gb, sm & 0xF);
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sm >>= 8; // 3 bits
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mask = sm & 0xff;
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sm >>= 8; // 1 bit
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*run = (sm & 0xff) + (e & mask); // 6 bits
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*level = (sm >> 8) + (e & ~mask); // 5 bits
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*final = i > (58 - 46);
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} else if (i < 75) { // [73-74]
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static const uint8_t crazy_mix_runlevel[32] = {
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0x22, 0x32, 0x33, 0x53, 0x23, 0x42, 0x43, 0x63,
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0x24, 0x52, 0x34, 0x73, 0x25, 0x62, 0x44, 0x83,
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0x26, 0x72, 0x35, 0x54, 0x27, 0x82, 0x45, 0x64,
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0x28, 0x92, 0x36, 0x74, 0x29, 0xa2, 0x46, 0x84,
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};
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*final = !(i & 1);
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e = get_bits(w->gb, 5); // get the extra bits
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*run = crazy_mix_runlevel[e] >> 4;
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*level = crazy_mix_runlevel[e] & 0x0F;
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} else {
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*level = get_bits(w->gb, 7 - 3 * (i & 1));
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*run = get_bits(w->gb, 6);
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*final = get_bits1(w->gb);
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}
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return;
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}
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/* static const uint8_t dc_extra_sbits[] = {
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* 0, 1, 1, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7,
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* }; */
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static const uint8_t dc_index_offset[] = {
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0, 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
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};
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static int x8_get_dc_rlf(IntraX8Context *const w, const int mode,
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int *const level, int *const final)
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{
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int i, e, c;
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assert(mode < 3);
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if (!w->j_dc_vlc[mode]) {
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int table_index = get_bits(w->gb, 3);
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// 4 modes, same table
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w->j_dc_vlc[mode] = &j_dc_vlc[w->quant < 13][table_index];
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}
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assert(w->j_dc_vlc);
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assert(w->j_dc_vlc[mode]->table);
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i = get_vlc2(w->gb, w->j_dc_vlc[mode]->table, DC_VLC_BITS, DC_VLC_MTD);
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/* (i >= 17) { i -= 17; final =1; } */
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c = i > 16;
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*final = c;
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i -= 17 * c;
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if (i <= 0) {
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*level = 0;
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return -i;
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}
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c = (i + 1) >> 1; // hackish way to calculate dc_extra_sbits[]
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c -= c > 1;
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e = get_bits(w->gb, c); // get the extra bits
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i = dc_index_offset[i] + (e >> 1);
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e = -(e & 1); // 0, 0xffffff
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*level = (i ^ e) - e; // (i ^ 0) - 0, (i ^ 0xff) - (-1)
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return 0;
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}
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// end of huffman
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static int x8_setup_spatial_predictor(IntraX8Context *const w, const int chroma)
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{
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int range;
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int sum;
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int quant;
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w->dsp.setup_spatial_compensation(w->dest[chroma], w->scratchpad,
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w->frame->linesize[chroma > 0],
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&range, &sum, w->edges);
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if (chroma) {
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w->orient = w->chroma_orient;
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quant = w->quant_dc_chroma;
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} else {
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quant = w->quant;
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}
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w->flat_dc = 0;
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if (range < quant || range < 3) {
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w->orient = 0;
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// yep you read right, a +-1 idct error may break decoding!
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if (range < 3) {
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w->flat_dc = 1;
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sum += 9;
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// ((1 << 17) + 9) / (8 + 8 + 1 + 2) = 6899
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w->predicted_dc = sum * 6899 >> 17;
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}
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}
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if (chroma)
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return 0;
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assert(w->orient < 3);
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if (range < 2 * w->quant) {
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if ((w->edges & 3) == 0) {
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if (w->orient == 1)
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w->orient = 11;
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if (w->orient == 2)
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w->orient = 10;
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} else {
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w->orient = 0;
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}
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w->raw_orient = 0;
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} else {
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static const uint8_t prediction_table[3][12] = {
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{ 0, 8, 4, 10, 11, 2, 6, 9, 1, 3, 5, 7 },
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{ 4, 0, 8, 11, 10, 3, 5, 2, 6, 9, 1, 7 },
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{ 8, 0, 4, 10, 11, 1, 7, 2, 6, 9, 3, 5 },
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};
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w->raw_orient = x8_get_orient_vlc(w);
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if (w->raw_orient < 0)
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return -1;
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assert(w->raw_orient < 12);
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assert(w->orient < 3);
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w->orient = prediction_table[w->orient][w->raw_orient];
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}
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return 0;
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}
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static void x8_update_predictions(IntraX8Context *const w, const int orient,
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const int est_run)
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{
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w->prediction_table[w->mb_x * 2 + (w->mb_y & 1)] = (est_run << 2) + 1 * (orient == 4) + 2 * (orient == 8);
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/*
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* y = 2n + 0 -> // 0 2 4
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* y = 2n + 1 -> // 1 3 5
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*/
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}
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static void x8_get_prediction_chroma(IntraX8Context *const w)
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{
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w->edges = 1 * !(w->mb_x >> 1);
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w->edges |= 2 * !(w->mb_y >> 1);
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w->edges |= 4 * (w->mb_x >= (2 * w->mb_width - 1)); // mb_x for chroma would always be odd
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w->raw_orient = 0;
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// lut_co[8] = {inv,4,8,8, inv,4,8,8} <- => {1,1,0,0;1,1,0,0} => 0xCC
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if (w->edges & 3) {
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w->chroma_orient = 4 << ((0xCC >> w->edges) & 1);
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return;
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}
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// block[x - 1][y | 1 - 1)]
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w->chroma_orient = (w->prediction_table[2 * w->mb_x - 2] & 0x03) << 2;
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}
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static void x8_get_prediction(IntraX8Context *const w)
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{
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int a, b, c, i;
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w->edges = 1 * !w->mb_x;
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w->edges |= 2 * !w->mb_y;
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w->edges |= 4 * (w->mb_x >= (2 * w->mb_width - 1));
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switch (w->edges & 3) {
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case 0:
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break;
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case 1:
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// take the one from the above block[0][y - 1]
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w->est_run = w->prediction_table[!(w->mb_y & 1)] >> 2;
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w->orient = 1;
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return;
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case 2:
|
|
// take the one from the previous block[x - 1][0]
|
|
w->est_run = w->prediction_table[2 * w->mb_x - 2] >> 2;
|
|
w->orient = 2;
|
|
return;
|
|
case 3:
|
|
w->est_run = 16;
|
|
w->orient = 0;
|
|
return;
|
|
}
|
|
// no edge cases
|
|
b = w->prediction_table[2 * w->mb_x + !(w->mb_y & 1)]; // block[x ][y - 1]
|
|
a = w->prediction_table[2 * w->mb_x - 2 + (w->mb_y & 1)]; // block[x - 1][y ]
|
|
c = w->prediction_table[2 * w->mb_x - 2 + !(w->mb_y & 1)]; // block[x - 1][y - 1]
|
|
|
|
w->est_run = FFMIN(b, a);
|
|
/* This condition has nothing to do with w->edges, even if it looks
|
|
* similar it would trigger if e.g. x = 3; y = 2;
|
|
* I guess somebody wrote something wrong and it became standard. */
|
|
if ((w->mb_x & w->mb_y) != 0)
|
|
w->est_run = FFMIN(c, w->est_run);
|
|
w->est_run >>= 2;
|
|
|
|
a &= 3;
|
|
b &= 3;
|
|
c &= 3;
|
|
|
|
i = (0xFFEAF4C4 >> (2 * b + 8 * a)) & 3;
|
|
if (i != 3)
|
|
w->orient = i;
|
|
else
|
|
w->orient = (0xFFEAD8 >> (2 * c + 8 * (w->quant > 12))) & 3;
|
|
/*
|
|
* lut1[b][a] = {
|
|
* ->{ 0, 1, 0, pad },
|
|
* { 0, 1, X, pad },
|
|
* { 2, 2, 2, pad }
|
|
* }
|
|
* pad 2 2 2;
|
|
* pad X 1 0;
|
|
* pad 0 1 0 <-
|
|
* -> 11 10 '10 10 '11 11'01 00 '11 00'01 00 => 0xEAF4C4
|
|
*
|
|
* lut2[q>12][c] = {
|
|
* ->{ 0, 2, 1, pad},
|
|
* { 2, 2, 2, pad}
|
|
* }
|
|
* pad 2 2 2;
|
|
* pad 1 2 0 <-
|
|
* -> 11 10'10 10 '11 01'10 00 => 0xEAD8
|
|
*/
|
|
}
|
|
|
|
static void x8_ac_compensation(IntraX8Context *const w, const int direction,
|
|
const int dc_level)
|
|
{
|
|
int t;
|
|
#define B(x, y) w->block[0][w->idsp.idct_permutation[(x) + (y) * 8]]
|
|
#define T(x) ((x) * dc_level + 0x8000) >> 16;
|
|
switch (direction) {
|
|
case 0:
|
|
t = T(3811); // h
|
|
B(1, 0) -= t;
|
|
B(0, 1) -= t;
|
|
|
|
t = T(487); // e
|
|
B(2, 0) -= t;
|
|
B(0, 2) -= t;
|
|
|
|
t = T(506); // f
|
|
B(3, 0) -= t;
|
|
B(0, 3) -= t;
|
|
|
|
t = T(135); // c
|
|
B(4, 0) -= t;
|
|
B(0, 4) -= t;
|
|
B(2, 1) += t;
|
|
B(1, 2) += t;
|
|
B(3, 1) += t;
|
|
B(1, 3) += t;
|
|
|
|
t = T(173); // d
|
|
B(5, 0) -= t;
|
|
B(0, 5) -= t;
|
|
|
|
t = T(61); // b
|
|
B(6, 0) -= t;
|
|
B(0, 6) -= t;
|
|
B(5, 1) += t;
|
|
B(1, 5) += t;
|
|
|
|
t = T(42); // a
|
|
B(7, 0) -= t;
|
|
B(0, 7) -= t;
|
|
B(4, 1) += t;
|
|
B(1, 4) += t;
|
|
B(4, 4) += t;
|
|
|
|
t = T(1084); // g
|
|
B(1, 1) += t;
|
|
|
|
w->block_last_index[0] = FFMAX(w->block_last_index[0], 7 * 8);
|
|
break;
|
|
case 1:
|
|
B(0, 1) -= T(6269);
|
|
B(0, 3) -= T(708);
|
|
B(0, 5) -= T(172);
|
|
B(0, 7) -= T(73);
|
|
|
|
w->block_last_index[0] = FFMAX(w->block_last_index[0], 7 * 8);
|
|
break;
|
|
case 2:
|
|
B(1, 0) -= T(6269);
|
|
B(3, 0) -= T(708);
|
|
B(5, 0) -= T(172);
|
|
B(7, 0) -= T(73);
|
|
|
|
w->block_last_index[0] = FFMAX(w->block_last_index[0], 7);
|
|
break;
|
|
}
|
|
#undef B
|
|
#undef T
|
|
}
|
|
|
|
static void dsp_x8_put_solidcolor(const uint8_t pix, uint8_t *dst,
|
|
const ptrdiff_t linesize)
|
|
{
|
|
int k;
|
|
for (k = 0; k < 8; k++) {
|
|
memset(dst, pix, 8);
|
|
dst += linesize;
|
|
}
|
|
}
|
|
|
|
static const int16_t quant_table[64] = {
|
|
256, 256, 256, 256, 256, 256, 259, 262,
|
|
265, 269, 272, 275, 278, 282, 285, 288,
|
|
292, 295, 299, 303, 306, 310, 314, 317,
|
|
321, 325, 329, 333, 337, 341, 345, 349,
|
|
353, 358, 362, 366, 371, 375, 379, 384,
|
|
389, 393, 398, 403, 408, 413, 417, 422,
|
|
428, 433, 438, 443, 448, 454, 459, 465,
|
|
470, 476, 482, 488, 493, 499, 505, 511,
|
|
};
|
|
|
|
static int x8_decode_intra_mb(IntraX8Context *const w, const int chroma)
|
|
{
|
|
uint8_t *scantable;
|
|
int final, run, level;
|
|
int ac_mode, dc_mode, est_run, dc_level;
|
|
int pos, n;
|
|
int zeros_only;
|
|
int use_quant_matrix;
|
|
int sign;
|
|
|
|
assert(w->orient < 12);
|
|
w->bdsp.clear_block(w->block[0]);
|
|
|
|
if (chroma)
|
|
dc_mode = 2;
|
|
else
|
|
dc_mode = !!w->est_run; // 0, 1
|
|
|
|
if (x8_get_dc_rlf(w, dc_mode, &dc_level, &final))
|
|
return -1;
|
|
n = 0;
|
|
zeros_only = 0;
|
|
if (!final) { // decode ac
|
|
use_quant_matrix = w->use_quant_matrix;
|
|
if (chroma) {
|
|
ac_mode = 1;
|
|
est_run = 64; // not used
|
|
} else {
|
|
if (w->raw_orient < 3)
|
|
use_quant_matrix = 0;
|
|
|
|
if (w->raw_orient > 4) {
|
|
ac_mode = 0;
|
|
est_run = 64;
|
|
} else {
|
|
if (w->est_run > 1) {
|
|
ac_mode = 2;
|
|
est_run = w->est_run;
|
|
} else {
|
|
ac_mode = 3;
|
|
est_run = 64;
|
|
}
|
|
}
|
|
}
|
|
x8_select_ac_table(w, ac_mode);
|
|
/* scantable_selector[12] = { 0, 2, 0, 1, 1, 1, 0, 2, 2, 0, 1, 2 }; <-
|
|
* -> 10'01' 00'10' 10'00' 01'01' 01'00' 10'00 => 0x928548 */
|
|
scantable = w->scantable[(0x928548 >> (2 * w->orient)) & 3].permutated;
|
|
pos = 0;
|
|
do {
|
|
n++;
|
|
if (n >= est_run) {
|
|
ac_mode = 3;
|
|
x8_select_ac_table(w, 3);
|
|
}
|
|
|
|
x8_get_ac_rlf(w, ac_mode, &run, &level, &final);
|
|
|
|
pos += run + 1;
|
|
if (pos > 63) {
|
|
// this also handles vlc error in x8_get_ac_rlf
|
|
return -1;
|
|
}
|
|
level = (level + 1) * w->dquant;
|
|
level += w->qsum;
|
|
|
|
sign = -get_bits1(w->gb);
|
|
level = (level ^ sign) - sign;
|
|
|
|
if (use_quant_matrix)
|
|
level = (level * quant_table[pos]) >> 8;
|
|
|
|
w->block[0][scantable[pos]] = level;
|
|
} while (!final);
|
|
|
|
w->block_last_index[0] = pos;
|
|
} else { // DC only
|
|
w->block_last_index[0] = 0;
|
|
if (w->flat_dc && ((unsigned) (dc_level + 1)) < 3) { // [-1; 1]
|
|
int32_t divide_quant = !chroma ? w->divide_quant_dc_luma
|
|
: w->divide_quant_dc_chroma;
|
|
int32_t dc_quant = !chroma ? w->quant
|
|
: w->quant_dc_chroma;
|
|
|
|
// original intent dc_level += predicted_dc/quant;
|
|
// but it got lost somewhere in the rounding
|
|
dc_level += (w->predicted_dc * divide_quant + (1 << 12)) >> 13;
|
|
|
|
dsp_x8_put_solidcolor(av_clip_uint8((dc_level * dc_quant + 4) >> 3),
|
|
w->dest[chroma],
|
|
w->frame->linesize[!!chroma]);
|
|
|
|
goto block_placed;
|
|
}
|
|
zeros_only = dc_level == 0;
|
|
}
|
|
if (!chroma)
|
|
w->block[0][0] = dc_level * w->quant;
|
|
else
|
|
w->block[0][0] = dc_level * w->quant_dc_chroma;
|
|
|
|
// there is !zero_only check in the original, but dc_level check is enough
|
|
if ((unsigned int) (dc_level + 1) >= 3 && (w->edges & 3) != 3) {
|
|
int direction;
|
|
/* ac_comp_direction[orient] = { 0, 3, 3, 1, 1, 0, 0, 0, 2, 2, 2, 1 }; <-
|
|
* -> 01'10' 10'10' 00'00' 00'01' 01'11' 11'00 => 0x6A017C */
|
|
direction = (0x6A017C >> (w->orient * 2)) & 3;
|
|
if (direction != 3) {
|
|
// modify block_last[]
|
|
x8_ac_compensation(w, direction, w->block[0][0]);
|
|
}
|
|
}
|
|
|
|
if (w->flat_dc) {
|
|
dsp_x8_put_solidcolor(w->predicted_dc, w->dest[chroma],
|
|
w->frame->linesize[!!chroma]);
|
|
} else {
|
|
w->dsp.spatial_compensation[w->orient](w->scratchpad,
|
|
w->dest[chroma],
|
|
w->frame->linesize[!!chroma]);
|
|
}
|
|
if (!zeros_only)
|
|
w->idsp.idct_add(w->dest[chroma],
|
|
w->frame->linesize[!!chroma],
|
|
w->block[0]);
|
|
|
|
block_placed:
|
|
if (!chroma)
|
|
x8_update_predictions(w, w->orient, n);
|
|
|
|
if (w->loopfilter) {
|
|
uint8_t *ptr = w->dest[chroma];
|
|
ptrdiff_t linesize = w->frame->linesize[!!chroma];
|
|
|
|
if (!((w->edges & 2) || (zeros_only && (w->orient | 4) == 4)))
|
|
w->dsp.h_loop_filter(ptr, linesize, w->quant);
|
|
|
|
if (!((w->edges & 1) || (zeros_only && (w->orient | 8) == 8)))
|
|
w->dsp.v_loop_filter(ptr, linesize, w->quant);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
// FIXME maybe merge with ff_*
|
|
static void x8_init_block_index(IntraX8Context *w, AVFrame *frame)
|
|
{
|
|
// not parent codec linesize as this would be wrong for field pics
|
|
// not that IntraX8 has interlacing support ;)
|
|
const ptrdiff_t linesize = frame->linesize[0];
|
|
const ptrdiff_t uvlinesize = frame->linesize[1];
|
|
|
|
w->dest[0] = frame->data[0];
|
|
w->dest[1] = frame->data[1];
|
|
w->dest[2] = frame->data[2];
|
|
|
|
w->dest[0] += w->mb_y * linesize << 3;
|
|
// chroma blocks are on add rows
|
|
w->dest[1] += (w->mb_y & ~1) * uvlinesize << 2;
|
|
w->dest[2] += (w->mb_y & ~1) * uvlinesize << 2;
|
|
}
|
|
|
|
av_cold int ff_intrax8_common_init(AVCodecContext *avctx,
|
|
IntraX8Context *w, IDCTDSPContext *idsp,
|
|
int16_t (*block)[64],
|
|
int block_last_index[12],
|
|
int mb_width, int mb_height)
|
|
{
|
|
int ret = x8_vlc_init();
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
w->avctx = avctx;
|
|
w->idsp = *idsp;
|
|
w->mb_width = mb_width;
|
|
w->mb_height = mb_height;
|
|
w->block = block;
|
|
w->block_last_index = block_last_index;
|
|
|
|
// two rows, 2 blocks per cannon mb
|
|
w->prediction_table = av_mallocz(w->mb_width * 2 * 2);
|
|
if (!w->prediction_table)
|
|
return AVERROR(ENOMEM);
|
|
|
|
ff_init_scantable(w->idsp.idct_permutation, &w->scantable[0],
|
|
ff_wmv1_scantable[0]);
|
|
ff_init_scantable(w->idsp.idct_permutation, &w->scantable[1],
|
|
ff_wmv1_scantable[2]);
|
|
ff_init_scantable(w->idsp.idct_permutation, &w->scantable[2],
|
|
ff_wmv1_scantable[3]);
|
|
|
|
ff_intrax8dsp_init(&w->dsp);
|
|
ff_blockdsp_init(&w->bdsp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
av_cold void ff_intrax8_common_end(IntraX8Context *w)
|
|
{
|
|
av_freep(&w->prediction_table);
|
|
}
|
|
|
|
int ff_intrax8_decode_picture(IntraX8Context *w, Picture *pict,
|
|
GetBitContext *gb, int *mb_x, int *mb_y,
|
|
int dquant, int quant_offset,
|
|
int loopfilter, int lowdelay)
|
|
{
|
|
int mb_xy;
|
|
|
|
w->gb = gb;
|
|
w->dquant = dquant;
|
|
w->quant = dquant >> 1;
|
|
w->qsum = quant_offset;
|
|
w->frame = pict->f;
|
|
w->loopfilter = loopfilter;
|
|
w->use_quant_matrix = get_bits1(w->gb);
|
|
|
|
w->mb_x = *mb_x;
|
|
w->mb_y = *mb_y;
|
|
|
|
w->divide_quant_dc_luma = ((1 << 16) + (w->quant >> 1)) / w->quant;
|
|
if (w->quant < 5) {
|
|
w->quant_dc_chroma = w->quant;
|
|
w->divide_quant_dc_chroma = w->divide_quant_dc_luma;
|
|
} else {
|
|
w->quant_dc_chroma = w->quant + ((w->quant + 3) >> 3);
|
|
w->divide_quant_dc_chroma = ((1 << 16) + (w->quant_dc_chroma >> 1)) / w->quant_dc_chroma;
|
|
}
|
|
x8_reset_vlc_tables(w);
|
|
|
|
for (w->mb_y = 0; w->mb_y < w->mb_height * 2; w->mb_y++) {
|
|
x8_init_block_index(w, w->frame);
|
|
mb_xy = (w->mb_y >> 1) * (w->mb_width + 1);
|
|
for (w->mb_x = 0; w->mb_x < w->mb_width * 2; w->mb_x++) {
|
|
x8_get_prediction(w);
|
|
if (x8_setup_spatial_predictor(w, 0))
|
|
goto error;
|
|
if (x8_decode_intra_mb(w, 0))
|
|
goto error;
|
|
|
|
if (w->mb_x & w->mb_y & 1) {
|
|
x8_get_prediction_chroma(w);
|
|
|
|
/* when setting up chroma, no vlc is read,
|
|
* so no error condition can be reached */
|
|
x8_setup_spatial_predictor(w, 1);
|
|
if (x8_decode_intra_mb(w, 1))
|
|
goto error;
|
|
|
|
x8_setup_spatial_predictor(w, 2);
|
|
if (x8_decode_intra_mb(w, 2))
|
|
goto error;
|
|
|
|
w->dest[1] += 8;
|
|
w->dest[2] += 8;
|
|
|
|
pict->qscale_table[mb_xy] = w->quant;
|
|
mb_xy++;
|
|
}
|
|
w->dest[0] += 8;
|
|
}
|
|
if (w->mb_y & 1)
|
|
ff_draw_horiz_band(w->avctx, w->frame, w->frame,
|
|
(w->mb_y - 1) * 8, 16,
|
|
PICT_FRAME, 0, lowdelay);
|
|
}
|
|
|
|
error:
|
|
*mb_x = w->mb_x;
|
|
*mb_y = w->mb_y;
|
|
|
|
return 0;
|
|
}
|