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https://github.com/FFmpeg/FFmpeg.git
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e5dcde620d
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>
135 lines
4.6 KiB
C
135 lines
4.6 KiB
C
/*
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* VC-1 and WMV3 decoder
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* copyright (c) 2006 Konstantin Shishkov
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* (c) 2005 anonymous, Alex Beregszaszi, Michael Niedermayer
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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* VC-1 tables.
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*/
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#ifndef AVCODEC_VC1DATA_H
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#define AVCODEC_VC1DATA_H
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#include <stdint.h>
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#include "libavutil/attributes_internal.h"
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#include "libavutil/rational.h"
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#include "vlc.h"
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FF_VISIBILITY_PUSH_HIDDEN
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/** Table for conversion between TTBLK and TTMB */
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extern const int ff_vc1_ttblk_to_tt[3][8];
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extern const int ff_vc1_ttfrm_to_tt[4];
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/** MV P mode - the 5th element is only used for mode 1 */
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extern const uint8_t ff_vc1_mv_pmode_table[2][5];
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extern const uint8_t ff_vc1_mv_pmode_table2[2][4];
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extern const int ff_vc1_fps_nr[7], ff_vc1_fps_dr[2];
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extern const uint8_t ff_vc1_pquant_table[3][32];
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/* MBMODE table for interlaced frame P-picture */
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extern const uint8_t ff_vc1_mbmode_intfrp[2][15][4];
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/** @name VC-1 VLC tables and defines
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* @todo TODO move this into the context
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*/
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//@{
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#define VC1_IMODE_VLC_BITS 4
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extern VLCElem ff_vc1_imode_vlc[1 << VC1_IMODE_VLC_BITS];
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#define VC1_NORM2_VLC_BITS 3
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extern VLCElem ff_vc1_norm2_vlc[1 << VC1_NORM2_VLC_BITS];
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#define VC1_NORM6_VLC_BITS 9
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extern VLCElem ff_vc1_norm6_vlc[556];
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/* Could be optimized, one table only needs 8 bits */
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#define VC1_TTMB_VLC_BITS 9 //12
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extern const VLCElem *ff_vc1_ttmb_vlc[3];
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#define VC1_MV_DIFF_VLC_BITS 9 //15
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extern const VLCElem *ff_vc1_mv_diff_vlc[4];
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#define VC1_CBPCY_P_VLC_BITS 9 //14
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extern const VLCElem *ff_vc1_cbpcy_p_vlc[4];
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#define VC1_ICBPCY_VLC_BITS 9
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extern const VLCElem *ff_vc1_icbpcy_vlc[8];
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#define VC1_4MV_BLOCK_PATTERN_VLC_BITS 6
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extern const VLCElem *ff_vc1_4mv_block_pattern_vlc[4];
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#define VC1_2MV_BLOCK_PATTERN_VLC_BITS 3
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extern const VLCElem *ff_vc1_2mv_block_pattern_vlc[4];
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#define VC1_TTBLK_VLC_BITS 5
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extern const VLCElem *ff_vc1_ttblk_vlc[3];
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#define VC1_SUBBLKPAT_VLC_BITS 6
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extern const VLCElem *ff_vc1_subblkpat_vlc[3];
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#define VC1_INTFR_4MV_MBMODE_VLC_BITS 9
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extern const VLCElem *ff_vc1_intfr_4mv_mbmode_vlc[4];
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#define VC1_INTFR_NON4MV_MBMODE_VLC_BITS 6
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extern const VLCElem *ff_vc1_intfr_non4mv_mbmode_vlc[4];
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#define VC1_IF_MMV_MBMODE_VLC_BITS 5
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extern const VLCElem *ff_vc1_if_mmv_mbmode_vlc[8];
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#define VC1_IF_1MV_MBMODE_VLC_BITS 5
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extern const VLCElem *ff_vc1_if_1mv_mbmode_vlc[8];
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#define VC1_1REF_MVDATA_VLC_BITS 9
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extern const VLCElem *ff_vc1_1ref_mvdata_vlc[4];
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#define VC1_2REF_MVDATA_VLC_BITS 9
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extern const VLCElem *ff_vc1_2ref_mvdata_vlc[8];
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extern const VLCElem *ff_vc1_ac_coeff_table[8];
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#define VC1_IF_MBMODE_VLC_BITS 5 // as a placeholder for VC1_IF_MMV_MBMODE_VLC_BITS
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// or VC1_IF_1MV_MBMODE_VLC_BITS since they are the same
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//@}
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#define B_FRACTION_DEN 256
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/* pre-computed scales for all bfractions and base=256 */
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extern const int16_t ff_vc1_bfraction_lut[23];
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//Same as H.264
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extern const AVRational ff_vc1_pixel_aspect[16];
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extern const uint8_t ff_wmv3_dc_scale_table[32];
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/* DC differentials low+hi-mo, p217 are the same as in msmpeg4data .h */
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/* Scantables/ZZ scan are at 11.9 (p262) and 8.1.1.12 (p10) */
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extern const uint8_t ff_vc1_simple_progressive_4x4_zz [16];
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extern const uint8_t ff_vc1_adv_progressive_8x4_zz [32];
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extern const uint8_t ff_vc1_adv_progressive_4x8_zz [32];
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extern const uint8_t ff_vc1_adv_interlaced_8x8_zz [64];
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extern const uint8_t ff_vc1_adv_interlaced_8x4_zz [32];
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extern const uint8_t ff_vc1_adv_interlaced_4x8_zz [32];
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extern const uint8_t ff_vc1_adv_interlaced_4x4_zz [16];
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/* DQScale as specified in 8.1.3.9 - almost identical to 0x40000/i */
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extern const int32_t ff_vc1_dqscale[63];
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/* P Interlaced field picture MV predictor scaling values (Table 114) */
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extern const uint16_t ff_vc1_field_mvpred_scales[2][7][4];
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/* B Interlaced field picture backward MV predictor scaling values for first field (Table 115) */
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extern const uint16_t ff_vc1_b_field_mvpred_scales[7][4];
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#define AC_MODES 8
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extern const int ff_vc1_ac_sizes[AC_MODES];
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FF_VISIBILITY_POP_HIDDEN
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#endif /* AVCODEC_VC1DATA_H */
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