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ffmpeg/libavcodec/vc1data.c
Andreas Rheinhardt e5dcde620d avcodec/vc1: Avoid superfluous VLC structures 
For all VLCs here, the number of bits of the VLC is
write-only, because it is hardcoded at the call site.
Therefore one can replace these VLC structures with
the only thing that is actually used: The pointer
to the VLCElem table. And in some cases one can even
avoid this.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2023-10-31 20:47:00 +01:00

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/*
* VC-1 and WMV3 decoder
* copyright (c) 2011 Mashiat Sarker Shakkhar
* copyright (c) 2006 Konstantin Shishkov
* (c) 2005 anonymous, Alex Beregszaszi, Michael Niedermayer
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* VC-1 tables.
*/
#include "vc1.h"
#include "vc1data.h"
#include "vlc.h"
/** Table for conversion between TTBLK and TTMB */
const int ff_vc1_ttblk_to_tt[3][8] = {
{ TT_8X4, TT_4X8, TT_8X8, TT_4X4, TT_8X4_TOP, TT_8X4_BOTTOM, TT_4X8_RIGHT, TT_4X8_LEFT },
{ TT_8X8, TT_4X8_RIGHT, TT_4X8_LEFT, TT_4X4, TT_8X4, TT_4X8, TT_8X4_BOTTOM, TT_8X4_TOP },
{ TT_8X8, TT_4X8, TT_4X4, TT_8X4_BOTTOM, TT_4X8_RIGHT, TT_4X8_LEFT, TT_8X4, TT_8X4_TOP }
};
const int ff_vc1_ttfrm_to_tt[4] = { TT_8X8, TT_8X4, TT_4X8, TT_4X4 };
/** MV P mode - the 5th element is only used for mode 1 */
const uint8_t ff_vc1_mv_pmode_table[2][5] = {
{ MV_PMODE_1MV_HPEL_BILIN, MV_PMODE_1MV, MV_PMODE_1MV_HPEL, MV_PMODE_INTENSITY_COMP, MV_PMODE_MIXED_MV },
{ MV_PMODE_1MV, MV_PMODE_MIXED_MV, MV_PMODE_1MV_HPEL, MV_PMODE_INTENSITY_COMP, MV_PMODE_1MV_HPEL_BILIN }
};
const uint8_t ff_vc1_mv_pmode_table2[2][4] = {
{ MV_PMODE_1MV_HPEL_BILIN, MV_PMODE_1MV, MV_PMODE_1MV_HPEL, MV_PMODE_MIXED_MV },
{ MV_PMODE_1MV, MV_PMODE_MIXED_MV, MV_PMODE_1MV_HPEL, MV_PMODE_1MV_HPEL_BILIN }
};
/* MBMODE table for interlaced frame P-picture */
const uint8_t ff_vc1_mbmode_intfrp[2][15][4] = {
{ /* 1: 4-MV, 0: non-4-MV */
/* Type, FIELDTX, 1-MV Differential present, Residuals (CBP) present */
/* Table 164 - Table 167 */
{ MV_PMODE_INTFR_1MV , 0, 1, 1 },
{ MV_PMODE_INTFR_1MV , 1, 1, 1 },
{ MV_PMODE_INTFR_1MV , 0, 1, 0 },
{ MV_PMODE_INTFR_1MV , 0, 0, 1 },
{ MV_PMODE_INTFR_1MV , 1, 0, 1 },
{ MV_PMODE_INTFR_2MV_FIELD, 0, 0, 1 },
{ MV_PMODE_INTFR_2MV_FIELD, 1, 0, 1 },
{ MV_PMODE_INTFR_2MV_FIELD, 1, 0, 0 },
{ MV_PMODE_INTFR_INTRA , 0, 0, 0 }
},
{
/* Table 160 - Table 163 */
{ MV_PMODE_INTFR_1MV , 0, 1, 1 },
{ MV_PMODE_INTFR_1MV , 1, 1, 1 },
{ MV_PMODE_INTFR_1MV , 0, 1, 0 },
{ MV_PMODE_INTFR_1MV , 0, 0, 1 },
{ MV_PMODE_INTFR_1MV , 1, 0, 1 },
{ MV_PMODE_INTFR_2MV_FIELD, 0, 0, 1 },
{ MV_PMODE_INTFR_2MV_FIELD, 1, 0, 1 },
{ MV_PMODE_INTFR_2MV_FIELD, 1, 0, 0 },
{ MV_PMODE_INTFR_4MV , 0, 0, 1 },
{ MV_PMODE_INTFR_4MV , 1, 0, 1 },
{ MV_PMODE_INTFR_4MV , 0, 0, 0 },
{ MV_PMODE_INTFR_4MV_FIELD, 0, 0, 1 },
{ MV_PMODE_INTFR_4MV_FIELD, 1, 0, 1 },
{ MV_PMODE_INTFR_4MV_FIELD, 1, 0, 0 },
{ MV_PMODE_INTFR_INTRA , 0, 0, 0 }
}
};
const int ff_vc1_fps_nr[7] = { 24, 25, 30, 50, 60, 48, 72 },
ff_vc1_fps_dr[2] = { 1000, 1001 };
const uint8_t ff_vc1_pquant_table[3][32] = {
/* Implicit quantizer */
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 6, 7, 8, 9, 10, 11, 12,
13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 29, 31 },
/* Explicit quantizer, pquantizer uniform */
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31 },
/* Explicit quantizer, pquantizer non-uniform */
{ 0, 1, 1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,
14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 29, 31 }
};
/** @name VC-1 VLC tables
* @todo TODO move this into the context
*/
//@{
VLCElem ff_vc1_imode_vlc[1 << VC1_IMODE_VLC_BITS];
VLCElem ff_vc1_norm2_vlc[1 << VC1_NORM2_VLC_BITS];
VLCElem ff_vc1_norm6_vlc[556];
/* Could be optimized, one table only needs 8 bits */
const VLCElem *ff_vc1_ttmb_vlc[3];
const VLCElem *ff_vc1_mv_diff_vlc[4];
const VLCElem *ff_vc1_cbpcy_p_vlc[4];
const VLCElem *ff_vc1_icbpcy_vlc[8];
const VLCElem *ff_vc1_4mv_block_pattern_vlc[4];
const VLCElem *ff_vc1_2mv_block_pattern_vlc[4];
const VLCElem *ff_vc1_ttblk_vlc[3];
const VLCElem *ff_vc1_subblkpat_vlc[3];
const VLCElem *ff_vc1_intfr_4mv_mbmode_vlc[4];
const VLCElem *ff_vc1_intfr_non4mv_mbmode_vlc[4];
const VLCElem *ff_vc1_if_mmv_mbmode_vlc[8];
const VLCElem *ff_vc1_if_1mv_mbmode_vlc[8];
const VLCElem *ff_vc1_1ref_mvdata_vlc[4];
const VLCElem *ff_vc1_2ref_mvdata_vlc[8];
const VLCElem *ff_vc1_ac_coeff_table[8];
//@}
#if B_FRACTION_DEN == 840 // original bfraction from vc9data.h, not conforming to standard
/* bfraction is fractional, we scale to the GCD 3*5*7*8 = 840 */
const int16_t ff_vc1_bfraction_lut[23] = {
420 /*1/2*/, 280 /*1/3*/, 560 /*2/3*/, 210 /*1/4*/,
630 /*3/4*/, 168 /*1/5*/, 336 /*2/5*/,
504 /*3/5*/, 672 /*4/5*/, 140 /*1/6*/, 700 /*5/6*/,
120 /*1/7*/, 240 /*2/7*/, 360 /*3/7*/, 480 /*4/7*/,
600 /*5/7*/, 720 /*6/7*/, 105 /*1/8*/, 315 /*3/8*/,
525 /*5/8*/, 735 /*7/8*/,
-1 /*inv.*/, 0 /*BI fm*/
};
#else
/* pre-computed scales for all bfractions and base=256 */
const int16_t ff_vc1_bfraction_lut[23] = {
128 /*1/2*/, 85 /*1/3*/, 170 /*2/3*/, 64 /*1/4*/,
192 /*3/4*/, 51 /*1/5*/, 102 /*2/5*/,
153 /*3/5*/, 204 /*4/5*/, 43 /*1/6*/, 215 /*5/6*/,
37 /*1/7*/, 74 /*2/7*/, 111 /*3/7*/, 148 /*4/7*/,
185 /*5/7*/, 222 /*6/7*/, 32 /*1/8*/, 96 /*3/8*/,
160 /*5/8*/, 224 /*7/8*/,
-1 /*inv.*/, 0 /*BI fm*/
};
#endif
//Same as H.264
const AVRational ff_vc1_pixel_aspect[16] = {
{ 0, 1 },
{ 1, 1 },
{ 12, 11 },
{ 10, 11 },
{ 16, 11 },
{ 40, 33 },
{ 24, 11 },
{ 20, 11 },
{ 32, 11 },
{ 80, 33 },
{ 18, 11 },
{ 15, 11 },
{ 64, 33 },
{ 160, 99 },
{ 0, 1 },
{ 0, 1 }
};
const uint8_t ff_wmv3_dc_scale_table[32] = {
0, 2, 4, 8, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13,
14, 14, 15, 15, 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21
};
/* DC differentials low+hi-mo, p217 are the same as in msmpeg4data .h */
/* Table 232 */
const uint8_t ff_vc1_simple_progressive_4x4_zz [16] = {
0, 8, 16, 1,
9, 24, 17, 2,
10, 18, 25, 3,
11, 26, 19, 27
};
const uint8_t ff_vc1_adv_progressive_8x4_zz [32] = { /* Table 233 */
0, 8, 1, 16, 2, 9, 10, 3,
24, 17, 4, 11, 18, 12, 5, 19,
25, 13, 20, 26, 27, 6, 21, 28,
14, 22, 29, 7, 30, 15, 23, 31
};
const uint8_t ff_vc1_adv_progressive_4x8_zz [32] = { /* Table 234 */
0, 1, 8, 2,
9, 16, 17, 24,
10, 32, 25, 18,
40, 3, 33, 26,
48, 11, 56, 41,
34, 49, 57, 42,
19, 50, 27, 58,
35, 43, 51, 59
};
const uint8_t ff_vc1_adv_interlaced_8x8_zz [64] = { /* Table 235 */
0, 8, 1, 16, 24, 9, 2, 32,
40, 48, 56, 17, 10, 3, 25, 18,
11, 4, 33, 41, 49, 57, 26, 34,
42, 50, 58, 19, 12, 5, 27, 20,
13, 6, 35, 28, 21, 14, 7, 15,
22, 29, 36, 43, 51, 59, 60, 52,
44, 37, 30, 23, 31, 38, 45, 53,
61, 62, 54, 46, 39, 47, 55, 63
};
const uint8_t ff_vc1_adv_interlaced_8x4_zz [32] = { /* Table 236 */
0, 8, 16, 24, 1, 9, 2, 17,
25, 10, 3, 18, 26, 4, 11, 19,
12, 5, 13, 20, 27, 6, 21, 28,
14, 22, 29, 7, 30, 15, 23, 31
};
const uint8_t ff_vc1_adv_interlaced_4x8_zz [32] = { /* Table 237 */
0, 1, 2, 8,
16, 9, 24, 17,
10, 3, 32, 40,
48, 56, 25, 18,
33, 26, 41, 34,
49, 57, 11, 42,
19, 50, 27, 58,
35, 43, 51, 59
};
const uint8_t ff_vc1_adv_interlaced_4x4_zz [16] = { /* Table 238 */
0, 8, 16, 24,
1, 9, 17, 2,
25, 10, 18, 3,
26, 11, 19, 27
};
/* DQScale as specified in 8.1.3.9 - almost identical to 0x40000/i */
const int32_t ff_vc1_dqscale[63] = {
0x40000, 0x20000, 0x15555, 0x10000, 0xCCCD, 0xAAAB, 0x9249, 0x8000,
0x71C7, 0x6666, 0x5D17, 0x5555, 0x4EC5, 0x4925, 0x4444, 0x4000,
0x3C3C, 0x38E4, 0x35E5, 0x3333, 0x30C3, 0x2E8C, 0x2C86, 0x2AAB,
0x28F6, 0x2762, 0x25ED, 0x2492, 0x234F, 0x2222, 0x2108, 0x2000,
0x1F08, 0x1E1E, 0x1D42, 0x1C72, 0x1BAD, 0x1AF3, 0x1A42, 0x199A,
0x18FA, 0x1862, 0x17D0, 0x1746, 0x16C1, 0x1643, 0x15CA, 0x1555,
0x14E6, 0x147B, 0x1414, 0x13B1, 0x1352, 0x12F7, 0x129E, 0x1249,
0x11F7, 0x11A8, 0x115B, 0x1111, 0x10C9, 0x1084, 0x1041
};
/* P Interlaced field picture MV predictor scaling values (Table 114) */
const uint16_t ff_vc1_field_mvpred_scales[2][7][4] = {
// Refdist:
// 0 1 2 3 or greater
{ // current field is first
{ 128, 192, 213, 224 }, // SCALEOPP
{ 512, 341, 307, 293 }, // SCALESAME1
{ 219, 236, 242, 245 }, // SCALESAME2
{ 32, 48, 53, 56 }, // SCALEZONE1_X
{ 8, 12, 13, 14 }, // SCALEZONE1_Y
{ 37, 20, 14, 11 }, // ZONE1OFFSET_X
{ 10, 5, 4, 3 } // ZONE1OFFSET_Y
},
{ // current field is second
{ 128, 64, 43, 32 }, // SCALEOPP
{ 512, 1024, 1536, 2048 }, // SCALESAME1
{ 219, 204, 200, 198 }, // SCALESAME2
{ 32, 16, 11, 8 }, // SCALEZONE1_X
{ 8, 4, 3, 2 }, // SCALEZONE1_Y
{ 37, 52, 56, 58 }, // ZONE1OFFSET_X
{ 10, 13, 14, 15 } // ZONE1OFFSET_Y
}
};
/* B Interlaced field picture backward MV predictor scaling values for first field (Table 115) */
const uint16_t ff_vc1_b_field_mvpred_scales[7][4] = {
// BRFD:
// 0 1 2 3 or greater
{ 171, 205, 219, 228 }, // SCALESAME
{ 384, 320, 299, 288 }, // SCALEOPP1
{ 230, 239, 244, 246 }, // SCALEOPP2
{ 43, 51, 55, 57 }, // SCALEZONE1_X
{ 11, 13, 14, 14 }, // SCALEZONE1_Y
{ 26, 17, 12, 10 }, // ZONE1OFFSET_X
{ 7, 4, 3, 3 } // ZONE1OFFSET_Y
};
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