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-/*
- * VC-1 and WMV3 decoder
- * Copyright (c) 2006-2007 Konstantin Shishkov
- * Partly based on vc9.c (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
- */
-
-#ifndef AVCODEC_VC1_H
-#define AVCODEC_VC1_H
-
-#include "avcodec.h"
-#include "h264chroma.h"
-#include "mpegvideo.h"
-#include "intrax8.h"
-#include "vc1dsp.h"
-
-#define AC_VLC_BITS 9
-
-/** Markers used in VC-1 AP frame data */
-//@{
-enum VC1Code {
- VC1_CODE_RES0 = 0x00000100,
- VC1_CODE_ENDOFSEQ = 0x0000010A,
- VC1_CODE_SLICE,
- VC1_CODE_FIELD,
- VC1_CODE_FRAME,
- VC1_CODE_ENTRYPOINT,
- VC1_CODE_SEQHDR,
-};
-//@}
-
-#define IS_MARKER(x) (((x) & ~0xFF) == VC1_CODE_RES0)
-
-/** Available Profiles */
-//@{
-enum Profile {
- PROFILE_SIMPLE,
- PROFILE_MAIN,
- PROFILE_COMPLEX, ///< TODO: WMV9 specific
- PROFILE_ADVANCED
-};
-//@}
-
-/** Sequence quantizer mode */
-//@{
-enum QuantMode {
- QUANT_FRAME_IMPLICIT, ///< Implicitly specified at frame level
- QUANT_FRAME_EXPLICIT, ///< Explicitly specified at frame level
- QUANT_NON_UNIFORM, ///< Non-uniform quant used for all frames
- QUANT_UNIFORM ///< Uniform quant used for all frames
-};
-//@}
-
-/** Where quant can be changed */
-//@{
-enum DQProfile {
- DQPROFILE_FOUR_EDGES,
- DQPROFILE_DOUBLE_EDGES,
- DQPROFILE_SINGLE_EDGE,
- DQPROFILE_ALL_MBS
-};
-//@}
-
-/** @name Where quant can be changed
- */
-//@{
-enum DQSingleEdge {
- DQSINGLE_BEDGE_LEFT,
- DQSINGLE_BEDGE_TOP,
- DQSINGLE_BEDGE_RIGHT,
- DQSINGLE_BEDGE_BOTTOM
-};
-//@}
-
-/** Which pair of edges is quantized with ALTPQUANT */
-//@{
-enum DQDoubleEdge {
- DQDOUBLE_BEDGE_TOPLEFT,
- DQDOUBLE_BEDGE_TOPRIGHT,
- DQDOUBLE_BEDGE_BOTTOMRIGHT,
- DQDOUBLE_BEDGE_BOTTOMLEFT
-};
-//@}
-
-/** MV modes for P frames */
-//@{
-enum MVModes {
- MV_PMODE_1MV_HPEL_BILIN,
- MV_PMODE_1MV,
- MV_PMODE_1MV_HPEL,
- MV_PMODE_MIXED_MV,
- MV_PMODE_INTENSITY_COMP
-};
-//@}
-
-/** MBMODE for interlaced frame P-picture */
-//@{
-enum MBModesIntfr {
- MV_PMODE_INTFR_1MV,
- MV_PMODE_INTFR_2MV_FIELD,
- MV_PMODE_INTFR_2MV,
- MV_PMODE_INTFR_4MV_FIELD,
- MV_PMODE_INTFR_4MV,
- MV_PMODE_INTFR_INTRA,
-};
-//@}
-
-/** @name MV types for B frames */
-//@{
-enum BMVTypes {
- BMV_TYPE_BACKWARD,
- BMV_TYPE_FORWARD,
- BMV_TYPE_INTERPOLATED,
- BMV_TYPE_DIRECT
-};
-//@}
-
-/** @name Block types for P/B frames */
-//@{
-enum TransformTypes {
- TT_8X8,
- TT_8X4_BOTTOM,
- TT_8X4_TOP,
- TT_8X4, // both halves
- TT_4X8_RIGHT,
- TT_4X8_LEFT,
- TT_4X8, // both halves
- TT_4X4
-};
-//@}
-
-enum CodingSet {
- CS_HIGH_MOT_INTRA = 0,
- CS_HIGH_MOT_INTER,
- CS_LOW_MOT_INTRA,
- CS_LOW_MOT_INTER,
- CS_MID_RATE_INTRA,
- CS_MID_RATE_INTER,
- CS_HIGH_RATE_INTRA,
- CS_HIGH_RATE_INTER
-};
-
-/** @name Overlap conditions for Advanced Profile */
-//@{
-enum COTypes {
- CONDOVER_NONE = 0,
- CONDOVER_ALL,
- CONDOVER_SELECT
-};
-//@}
-
-/**
- * FCM Frame Coding Mode
- * @note some content might be marked interlaced
- * but have fcm set to 0 as well (e.g. HD-DVD)
- */
-enum FrameCodingMode {
- PROGRESSIVE = 0, ///< in the bitstream is reported as 00b
- ILACE_FRAME, ///< in the bitstream is reported as 10b
- ILACE_FIELD ///< in the bitstream is reported as 11b
-};
-
-/** The VC1 Context
- * @todo Change size wherever another size is more efficient
- * Many members are only used for Advanced Profile
- */
-typedef struct VC1Context{
- MpegEncContext s;
- IntraX8Context x8;
- H264ChromaContext h264chroma;
- VC1DSPContext vc1dsp;
-
- int bits;
-
- /** Simple/Main Profile sequence header */
- //@{
- int res_sprite; ///< reserved, sprite mode
- int res_y411; ///< reserved, old interlaced mode
- int res_x8; ///< reserved
- int multires; ///< frame-level RESPIC syntax element present
- int res_fasttx; ///< reserved, always 1
- int res_transtab; ///< reserved, always 0
- int rangered; ///< RANGEREDFRM (range reduction) syntax element present
- ///< at frame level
- int res_rtm_flag; ///< reserved, set to 1
- int reserved; ///< reserved
- //@}
-
- /** Advanced Profile */
- //@{
- int level; ///< 3bits, for Advanced/Simple Profile, provided by TS layer
- int chromaformat; ///< 2bits, 2=4:2:0, only defined
- int postprocflag; ///< Per-frame processing suggestion flag present
- int broadcast; ///< TFF/RFF present
- int interlace; ///< Progressive/interlaced (RPTFTM syntax element)
- int tfcntrflag; ///< TFCNTR present
- int panscanflag; ///< NUMPANSCANWIN, TOPLEFT{X,Y}, BOTRIGHT{X,Y} present
- int refdist_flag; ///< REFDIST syntax element present in II, IP, PI or PP field picture headers
- int extended_dmv; ///< Additional extended dmv range at P/B frame-level
- int hrd_param_flag; ///< Presence of Hypothetical Reference
- ///< Decoder parameters
- int psf; ///< Progressive Segmented Frame
- //@}
-
- /** Sequence header data for all Profiles
- * TODO: choose between ints, uint8_ts and monobit flags
- */
- //@{
- int profile; ///< 2bits, Profile
- int frmrtq_postproc; ///< 3bits,
- int bitrtq_postproc; ///< 5bits, quantized framerate-based postprocessing strength
- int max_coded_width, max_coded_height;
- int fastuvmc; ///< Rounding of qpel vector to hpel ? (not in Simple)
- int extended_mv; ///< Ext MV in P/B (not in Simple)
- int dquant; ///< How qscale varies with MBs, 2bits (not in Simple)
- int vstransform; ///< variable-size [48]x[48] transform type + info
- int overlap; ///< overlapped transforms in use
- int quantizer_mode; ///< 2bits, quantizer mode used for sequence, see QUANT_*
- int finterpflag; ///< INTERPFRM present
- //@}
-
- /** Frame decoding info for all profiles */
- //@{
- uint8_t mv_mode; ///< MV coding monde
- uint8_t mv_mode2; ///< Secondary MV coding mode (B frames)
- int k_x; ///< Number of bits for MVs (depends on MV range)
- int k_y; ///< Number of bits for MVs (depends on MV range)
- int range_x, range_y; ///< MV range
- uint8_t pq, altpq; ///< Current/alternate frame quantizer scale
- uint8_t zz_8x8[4][64]; ///< Zigzag table for TT_8x8, permuted for IDCT
- int left_blk_sh, top_blk_sh; ///< Either 3 or 0, positions of l/t in blk[]
- const uint8_t* zz_8x4; ///< Zigzag scan table for TT_8x4 coding mode
- const uint8_t* zz_4x8; ///< Zigzag scan table for TT_4x8 coding mode
- /** pquant parameters */
- //@{
- uint8_t dquantfrm;
- uint8_t dqprofile;
- uint8_t dqsbedge;
- uint8_t dqbilevel;
- //@}
- /** AC coding set indexes
- * @see 8.1.1.10, p(1)10
- */
- //@{
- int c_ac_table_index; ///< Chroma index from ACFRM element
- int y_ac_table_index; ///< Luma index from AC2FRM element
- //@}
- int ttfrm; ///< Transform type info present at frame level
- uint8_t ttmbf; ///< Transform type flag
- int *ttblk_base, *ttblk; ///< Transform type at the block level
- int codingset; ///< index of current table set from 11.8 to use for luma block decoding
- int codingset2; ///< index of current table set from 11.8 to use for chroma block decoding
- int pqindex; ///< raw pqindex used in coding set selection
- int a_avail, c_avail;
- uint8_t *mb_type_base, *mb_type[3];
-
-
- /** Luma compensation parameters */
- //@{
- uint8_t lumscale;
- uint8_t lumshift;
- //@}
- int16_t bfraction; ///< Relative position % anchors=> how to scale MVs
- uint8_t halfpq; ///< Uniform quant over image and qp+.5
- uint8_t respic; ///< Frame-level flag for resized images
- int buffer_fullness; ///< HRD info
- /** Ranges:
- * -# 0 -> [-64n 63.f] x [-32, 31.f]
- * -# 1 -> [-128, 127.f] x [-64, 63.f]
- * -# 2 -> [-512, 511.f] x [-128, 127.f]
- * -# 3 -> [-1024, 1023.f] x [-256, 255.f]
- */
- uint8_t mvrange; ///< Extended MV range flag
- uint8_t pquantizer; ///< Uniform (over sequence) quantizer in use
- VLC *cbpcy_vlc; ///< CBPCY VLC table
- int tt_index; ///< Index for Transform Type tables (to decode TTMB)
- uint8_t* mv_type_mb_plane; ///< bitplane for mv_type == (4MV)
- uint8_t* direct_mb_plane; ///< bitplane for "direct" MBs
- uint8_t* forward_mb_plane; ///< bitplane for "forward" MBs
- int mv_type_is_raw; ///< mv type mb plane is not coded
- int dmb_is_raw; ///< direct mb plane is raw
- int fmb_is_raw; ///< forward mb plane is raw
- int skip_is_raw; ///< skip mb plane is not coded
- uint8_t luty[256], lutuv[256]; ///< lookup tables used for intensity compensation
- int use_ic; ///< use intensity compensation in B-frames
- int rnd; ///< rounding control
-
- /** Frame decoding info for S/M profiles only */
- //@{
- uint8_t rangeredfrm; ///< out_sample = CLIP((in_sample-128)*2+128)
- uint8_t interpfrm;
- //@}
-
- /** Frame decoding info for Advanced profile */
- //@{
- enum FrameCodingMode fcm;
- uint8_t numpanscanwin;
- uint8_t tfcntr;
- uint8_t rptfrm, tff, rff;
- uint16_t topleftx;
- uint16_t toplefty;
- uint16_t bottomrightx;
- uint16_t bottomrighty;
- uint8_t uvsamp;
- uint8_t postproc;
- int hrd_num_leaky_buckets;
- uint8_t bit_rate_exponent;
- uint8_t buffer_size_exponent;
- uint8_t* acpred_plane; ///< AC prediction flags bitplane
- int acpred_is_raw;
- uint8_t* over_flags_plane; ///< Overflags bitplane
- int overflg_is_raw;
- uint8_t condover;
- uint16_t *hrd_rate, *hrd_buffer;
- uint8_t *hrd_fullness;
- uint8_t range_mapy_flag;
- uint8_t range_mapuv_flag;
- uint8_t range_mapy;
- uint8_t range_mapuv;
- //@}
-
- /** Frame decoding info for interlaced picture */
- uint8_t dmvrange; ///< Extended differential MV range flag
- int fourmvswitch;
- int intcomp;
- uint8_t lumscale2; ///< for interlaced field P picture
- uint8_t lumshift2;
- uint8_t luty2[256], lutuv2[256]; // lookup tables used for intensity compensation
- VLC* mbmode_vlc;
- VLC* imv_vlc;
- VLC* twomvbp_vlc;
- VLC* fourmvbp_vlc;
- uint8_t twomvbp;
- uint8_t fourmvbp;
- uint8_t* fieldtx_plane;
- int fieldtx_is_raw;
- uint8_t zzi_8x8[64];
- uint8_t *blk_mv_type_base, *blk_mv_type; ///< 0: frame MV, 1: field MV (interlaced frame)
- uint8_t *mv_f_base, *mv_f[2]; ///< 0: MV obtained from same field, 1: opposite field
- uint8_t *mv_f_last_base, *mv_f_last[2];
- uint8_t *mv_f_next_base, *mv_f_next[2];
- int field_mode; ///< 1 for interlaced field pictures
- int fptype;
- int second_field;
- int refdist; ///< distance of the current picture from reference
- int numref; ///< number of past field pictures used as reference
- // 0 corresponds to 1 and 1 corresponds to 2 references
- int reffield; ///< if numref = 0 (1 reference) then reffield decides which
- // field to use among the two fields from previous frame
- int intcompfield; ///< which of the two fields to be intensity compensated
- // 0: both fields, 1: bottom field, 2: top field
- int cur_field_type; ///< 0: top, 1: bottom
- int ref_field_type[2]; ///< forward and backward reference field type (top or bottom)
- int blocks_off, mb_off;
- int qs_last; ///< if qpel has been used in the previous (tr.) picture
- int bmvtype;
- int frfd, brfd; ///< reference frame distance (forward or backward)
- int first_pic_header_flag;
- int pic_header_flag;
-
- /** Frame decoding info for sprite modes */
- //@{
- int new_sprite;
- int two_sprites;
- AVFrame sprite_output_frame;
- int output_width, output_height, sprite_width, sprite_height;
- uint8_t* sr_rows[2][2]; ///< Sprite resizer line cache
- //@}
-
- int p_frame_skipped;
- int bi_type;
- int x8_type;
-
- int16_t (*block)[6][64];
- int n_allocated_blks, cur_blk_idx, left_blk_idx, topleft_blk_idx, top_blk_idx;
- uint32_t *cbp_base, *cbp;
- uint8_t *is_intra_base, *is_intra;
- int16_t (*luma_mv_base)[2], (*luma_mv)[2];
- uint8_t bfraction_lut_index; ///< Index for BFRACTION value (see Table 40, reproduced into ff_vc1_bfraction_lut[])
- uint8_t broken_link; ///< Broken link flag (BROKEN_LINK syntax element)
- uint8_t closed_entry; ///< Closed entry point flag (CLOSED_ENTRY syntax element)
-
- int end_mb_x; ///< Horizontal macroblock limit (used only by mss2)
-
- int parse_only; ///< Context is used within parser
-
- int warn_interlaced;
-} VC1Context;
-
-/** Find VC-1 marker in buffer
- * @return position where next marker starts or end of buffer if no marker found
- */
-static av_always_inline const uint8_t* find_next_marker(const uint8_t *src, const uint8_t *end)
-{
- uint32_t mrk = 0xFFFFFFFF;
-
- if (end-src < 4)
- return end;
- while (src < end) {
- mrk = (mrk << 8) | *src++;
- if (IS_MARKER(mrk))
- return src - 4;
- }
- return end;
-}
-
-static av_always_inline int vc1_unescape_buffer(const uint8_t *src, int size, uint8_t *dst)
-{
- int dsize = 0, i;
-
- if (size < 4) {
- for (dsize = 0; dsize < size; dsize++)
- *dst++ = *src++;
- return size;
- }
- for (i = 0; i < size; i++, src++) {
- if (src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) {
- dst[dsize++] = src[1];
- src++;
- i++;
- } else
- dst[dsize++] = *src;
- }
- return dsize;
-}
-
-/**
- * Decode Simple/Main Profiles sequence header
- * @see Figure 7-8, p16-17
- * @param avctx Codec context
- * @param gb GetBit context initialized from Codec context extra_data
- * @return Status
- */
-int ff_vc1_decode_sequence_header(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb);
-
-int ff_vc1_decode_entry_point(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb);
-
-int ff_vc1_parse_frame_header (VC1Context *v, GetBitContext *gb);
-int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext *gb);
-int ff_vc1_init_common(VC1Context *v);
-
-int ff_vc1_decode_init_alloc_tables(VC1Context *v);
-void ff_vc1_init_transposed_scantables(VC1Context *v);
-int ff_vc1_decode_end(AVCodecContext *avctx);
-void ff_vc1_decode_blocks(VC1Context *v);
-
-#endif /* AVCODEC_VC1_H */
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