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FFmpeg/libavcodec/vc1.h

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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 Libav.
*
* Libav 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.
*
* Libav 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 Libav; 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 color_prim; ///< 8bits, chroma coordinates of the color primaries
int transfer_char; ///< 8bits, Opto-electronic transfer characteristics
int matrix_coef; ///< 8bits, Color primaries->YCbCr transform matrix
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 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;
int8_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 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);
av_cold int ff_vc1_decode_init_alloc_tables(VC1Context *v);
av_cold void ff_vc1_init_transposed_scantables(VC1Context *v);
av_cold int ff_vc1_decode_end(AVCodecContext *avctx);
void ff_vc1_decode_blocks(VC1Context *v);
#endif /* AVCODEC_VC1_H */