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/*
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 * VC-1 and WMV3 decoder
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 * Copyright (c) 2006-2007 Konstantin Shishkov
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 * Partly based on vc9.c (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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#ifndef AVCODEC_VC1_H
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#define AVCODEC_VC1_H
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#include "avcodec.h"
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#include "mpegvideo.h"
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#include "intrax8.h"
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/** Markers used in VC-1 AP frame data */
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//@{
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enum VC1Code{
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    VC1_CODE_RES0       = 0x00000100,
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    VC1_CODE_ENDOFSEQ   = 0x0000010A,
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    VC1_CODE_SLICE,
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    VC1_CODE_FIELD,
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    VC1_CODE_FRAME,
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    VC1_CODE_ENTRYPOINT,
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    VC1_CODE_SEQHDR,
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};
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//@}
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#define IS_MARKER(x) (((x) & ~0xFF) == VC1_CODE_RES0)
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/** Available Profiles */
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//@{
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enum Profile {
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    PROFILE_SIMPLE,
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    PROFILE_MAIN,
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    PROFILE_COMPLEX, ///< TODO: WMV9 specific
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    PROFILE_ADVANCED
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};
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//@}
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/** Sequence quantizer mode */
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//@{
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enum QuantMode {
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    QUANT_FRAME_IMPLICIT,    ///< Implicitly specified at frame level
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    QUANT_FRAME_EXPLICIT,    ///< Explicitly specified at frame level
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    QUANT_NON_UNIFORM,       ///< Non-uniform quant used for all frames
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    QUANT_UNIFORM            ///< Uniform quant used for all frames
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};
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//@}
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/** Where quant can be changed */
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//@{
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enum DQProfile {
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    DQPROFILE_FOUR_EDGES,
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    DQPROFILE_DOUBLE_EDGES,
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    DQPROFILE_SINGLE_EDGE,
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    DQPROFILE_ALL_MBS
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};
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//@}
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/** @name Where quant can be changed
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 */
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//@{
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enum DQSingleEdge {
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    DQSINGLE_BEDGE_LEFT,
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    DQSINGLE_BEDGE_TOP,
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    DQSINGLE_BEDGE_RIGHT,
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    DQSINGLE_BEDGE_BOTTOM
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};
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//@}
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/** Which pair of edges is quantized with ALTPQUANT */
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//@{
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enum DQDoubleEdge {
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    DQDOUBLE_BEDGE_TOPLEFT,
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    DQDOUBLE_BEDGE_TOPRIGHT,
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    DQDOUBLE_BEDGE_BOTTOMRIGHT,
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    DQDOUBLE_BEDGE_BOTTOMLEFT
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};
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//@}
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/** MV modes for P frames */
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//@{
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enum MVModes {
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    MV_PMODE_1MV_HPEL_BILIN,
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    MV_PMODE_1MV,
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    MV_PMODE_1MV_HPEL,
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    MV_PMODE_MIXED_MV,
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    MV_PMODE_INTENSITY_COMP
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};
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//@}
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/** @name MV types for B frames */
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//@{
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enum BMVTypes {
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    BMV_TYPE_BACKWARD,
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    BMV_TYPE_FORWARD,
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    BMV_TYPE_INTERPOLATED
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};
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//@}
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/** @name Block types for P/B frames */
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//@{
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enum TransformTypes {
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    TT_8X8,
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    TT_8X4_BOTTOM,
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    TT_8X4_TOP,
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    TT_8X4, //Both halves
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    TT_4X8_RIGHT,
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    TT_4X8_LEFT,
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    TT_4X8, //Both halves
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    TT_4X4
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};
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//@}
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enum CodingSet {
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    CS_HIGH_MOT_INTRA = 0,
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    CS_HIGH_MOT_INTER,
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    CS_LOW_MOT_INTRA,
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    CS_LOW_MOT_INTER,
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    CS_MID_RATE_INTRA,
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    CS_MID_RATE_INTER,
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    CS_HIGH_RATE_INTRA,
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    CS_HIGH_RATE_INTER
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};
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/** @name Overlap conditions for Advanced Profile */
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//@{
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enum COTypes {
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    CONDOVER_NONE = 0,
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    CONDOVER_ALL,
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    CONDOVER_SELECT
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};
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//@}
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/** The VC1 Context
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 * @todo Change size wherever another size is more efficient
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 * Many members are only used for Advanced Profile
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 */
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typedef struct VC1Context{
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    MpegEncContext s;
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    IntraX8Context x8;
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    int bits;
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    /** Simple/Main Profile sequence header */
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    //@{
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    int res_sprite;       ///< reserved, sprite mode
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    int res_y411;         ///< reserved, old interlaced mode
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    int res_x8;           ///< reserved
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    int multires;         ///< frame-level RESPIC syntax element present
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    int res_fasttx;       ///< reserved, always 1
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    int res_transtab;     ///< reserved, always 0
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    int rangered;         ///< RANGEREDFRM (range reduction) syntax element present
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                          ///< at frame level
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    int res_rtm_flag;     ///< reserved, set to 1
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    int reserved;         ///< reserved
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    //@}
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    /** Advanced Profile */
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    //@{
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    int level;            ///< 3bits, for Advanced/Simple Profile, provided by TS layer
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    int chromaformat;     ///< 2bits, 2=4:2:0, only defined
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    int postprocflag;     ///< Per-frame processing suggestion flag present
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    int broadcast;        ///< TFF/RFF present
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    int interlace;        ///< Progressive/interlaced (RPTFTM syntax element)
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    int tfcntrflag;       ///< TFCNTR present
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    int panscanflag;      ///< NUMPANSCANWIN, TOPLEFT{X,Y}, BOTRIGHT{X,Y} present
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    int refdist_flag;     ///< REFDIST syntax element present in II, IP, PI or PP field picture headers
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    int extended_dmv;     ///< Additional extended dmv range at P/B frame-level
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    int color_prim;       ///< 8bits, chroma coordinates of the color primaries
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    int transfer_char;    ///< 8bits, Opto-electronic transfer characteristics
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    int matrix_coef;      ///< 8bits, Color primaries->YCbCr transform matrix
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    int hrd_param_flag;   ///< Presence of Hypothetical Reference
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                          ///< Decoder parameters
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    int psf;              ///< Progressive Segmented Frame
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    //@}
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    /** Sequence header data for all Profiles
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     * TODO: choose between ints, uint8_ts and monobit flags
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     */
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    //@{
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    int profile;          ///< 2bits, Profile
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    int frmrtq_postproc;  ///< 3bits,
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    int bitrtq_postproc;  ///< 5bits, quantized framerate-based postprocessing strength
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    int fastuvmc;         ///< Rounding of qpel vector to hpel ? (not in Simple)
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    int extended_mv;      ///< Ext MV in P/B (not in Simple)
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    int dquant;           ///< How qscale varies with MBs, 2bits (not in Simple)
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    int vstransform;      ///< variable-size [48]x[48] transform type + info
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    int overlap;          ///< overlapped transforms in use
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    int quantizer_mode;   ///< 2bits, quantizer mode used for sequence, see QUANT_*
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    int finterpflag;      ///< INTERPFRM present
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    //@}
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    /** Frame decoding info for all profiles */
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    //@{
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    uint8_t mv_mode;      ///< MV coding monde
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    uint8_t mv_mode2;     ///< Secondary MV coding mode (B frames)
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    int k_x;              ///< Number of bits for MVs (depends on MV range)
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    int k_y;              ///< Number of bits for MVs (depends on MV range)
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    int range_x, range_y; ///< MV range
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    uint8_t pq, altpq;    ///< Current/alternate frame quantizer scale
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    uint8_t zz_8x8[4][64];///< Zigzag table for TT_8x8, permuted for IDCT
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    const uint8_t* zz_8x4;///< Zigzag scan table for TT_8x4 coding mode
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    const uint8_t* zz_4x8;///< Zigzag scan table for TT_4x8 coding mode
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    /** pquant parameters */
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    //@{
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    uint8_t dquantfrm;
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    uint8_t dqprofile;
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    uint8_t dqsbedge;
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    uint8_t dqbilevel;
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    //@}
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    /** AC coding set indexes
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     * @see 8.1.1.10, p(1)10
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     */
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    //@{
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    int c_ac_table_index; ///< Chroma index from ACFRM element
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    int y_ac_table_index; ///< Luma index from AC2FRM element
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    //@}
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    int ttfrm;            ///< Transform type info present at frame level
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    uint8_t ttmbf;        ///< Transform type flag
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    uint8_t ttblk4x4;     ///< Value of ttblk which indicates a 4x4 transform
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    int codingset;        ///< index of current table set from 11.8 to use for luma block decoding
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    int codingset2;       ///< index of current table set from 11.8 to use for chroma block decoding
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    int pqindex;          ///< raw pqindex used in coding set selection
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    int a_avail, c_avail;
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    uint8_t *mb_type_base, *mb_type[3];
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    /** Luma compensation parameters */
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    //@{
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    uint8_t lumscale;
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    uint8_t lumshift;
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    //@}
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    int16_t bfraction;    ///< Relative position % anchors=> how to scale MVs
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    uint8_t halfpq;       ///< Uniform quant over image and qp+.5
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    uint8_t respic;       ///< Frame-level flag for resized images
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    int buffer_fullness;  ///< HRD info
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    /** Ranges:
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     * -# 0 -> [-64n 63.f] x [-32, 31.f]
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     * -# 1 -> [-128, 127.f] x [-64, 63.f]
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     * -# 2 -> [-512, 511.f] x [-128, 127.f]
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     * -# 3 -> [-1024, 1023.f] x [-256, 255.f]
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     */
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    uint8_t mvrange;
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    uint8_t pquantizer;           ///< Uniform (over sequence) quantizer in use
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    VLC *cbpcy_vlc;               ///< CBPCY VLC table
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    int tt_index;                 ///< Index for Transform Type tables
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    uint8_t* mv_type_mb_plane;    ///< bitplane for mv_type == (4MV)
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    uint8_t* direct_mb_plane;     ///< bitplane for "direct" MBs
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    int mv_type_is_raw;           ///< mv type mb plane is not coded
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    int dmb_is_raw;               ///< direct mb plane is raw
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    int skip_is_raw;              ///< skip mb plane is not coded
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    uint8_t luty[256], lutuv[256]; // lookup tables used for intensity compensation
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    int use_ic;                   ///< use intensity compensation in B-frames
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    int rnd;                      ///< rounding control
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    /** Frame decoding info for S/M profiles only */
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    //@{
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    uint8_t rangeredfrm; ///< out_sample = CLIP((in_sample-128)*2+128)
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    uint8_t interpfrm;
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    //@}
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    /** Frame decoding info for Advanced profile */
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    //@{
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    uint8_t fcm; ///< 0->Progressive, 2->Frame-Interlace, 3->Field-Interlace
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    uint8_t numpanscanwin;
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    uint8_t tfcntr;
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    uint8_t rptfrm, tff, rff;
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    uint16_t topleftx;
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    uint16_t toplefty;
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    uint16_t bottomrightx;
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    uint16_t bottomrighty;
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    uint8_t uvsamp;
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    uint8_t postproc;
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    int hrd_num_leaky_buckets;
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    uint8_t bit_rate_exponent;
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    uint8_t buffer_size_exponent;
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    uint8_t* acpred_plane;       ///< AC prediction flags bitplane
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    int acpred_is_raw;
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    uint8_t* over_flags_plane;   ///< Overflags bitplane
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    int overflg_is_raw;
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    uint8_t condover;
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    uint16_t *hrd_rate, *hrd_buffer;
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    uint8_t *hrd_fullness;
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    uint8_t range_mapy_flag;
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    uint8_t range_mapuv_flag;
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    uint8_t range_mapy;
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    uint8_t range_mapuv;
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    //@}
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    int p_frame_skipped;
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    int bi_type;
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    int x8_type;
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    uint32_t *cbp_base, *cbp;
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    uint8_t bfraction_lut_index;///< Index for BFRACTION value (see Table 40, reproduced into ff_vc1_bfraction_lut[])
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    uint8_t broken_link;        ///< Broken link flag (BROKEN_LINK syntax element)
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    uint8_t closed_entry;       ///< Closed entry point flag (CLOSED_ENTRY syntax element)
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    int parse_only;             ///< Context is used within parser
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    int warn_interlaced;
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} VC1Context;
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/** Find VC-1 marker in buffer
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 * @return position where next marker starts or end of buffer if no marker found
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 */
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static av_always_inline const uint8_t* find_next_marker(const uint8_t *src, const uint8_t *end)
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{
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    uint32_t mrk = 0xFFFFFFFF;
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    if(end-src < 4) return end;
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    while(src < end){
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        mrk = (mrk << 8) | *src++;
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        if(IS_MARKER(mrk))
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            return src-4;
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    }
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    return end;
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}
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static av_always_inline int vc1_unescape_buffer(const uint8_t *src, int size, uint8_t *dst)
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{
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    int dsize = 0, i;
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    if(size < 4){
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        for(dsize = 0; dsize < size; dsize++) *dst++ = *src++;
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        return size;
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    }
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    for(i = 0; i < size; i++, src++) {
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        if(src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) {
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            dst[dsize++] = src[1];
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            src++;
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            i++;
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        } else
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            dst[dsize++] = *src;
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    }
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    return dsize;
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}
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/**
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 * Decode Simple/Main Profiles sequence header
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 * @see Figure 7-8, p16-17
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 * @param avctx Codec context
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 * @param gb GetBit context initialized from Codec context extra_data
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 * @return Status
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 */
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int vc1_decode_sequence_header(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb);
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int vc1_decode_entry_point(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb);
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int vc1_parse_frame_header    (VC1Context *v, GetBitContext *gb);
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int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext *gb);
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#endif /* AVCODEC_VC1_H */