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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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* This file is part of FFmpeg.
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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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* 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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* 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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#include "mpegvideo.h"
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/** Markers used in VC-1 AP frame data */
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VC1_CODE_RES0 = 0x00000100,
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VC1_CODE_ENDOFSEQ = 0x0000010A,
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#define IS_MARKER(x) (((x) & ~0xFF) == VC1_CODE_RES0)
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/** Available Profiles */
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PROFILE_COMPLEX, ///< TODO: WMV9 specific
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/** Sequence quantizer mode */
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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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/** Where quant can be changed */
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DQPROFILE_DOUBLE_EDGES,
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DQPROFILE_SINGLE_EDGE,
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/** @name Where quant can be changed
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/** Which pair of edges is quantized with ALTPQUANT */
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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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/** MV modes for P frames */
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MV_PMODE_1MV_HPEL_BILIN,
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MV_PMODE_INTENSITY_COMP
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/** @name MV types for B frames */
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BMV_TYPE_INTERPOLATED
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/** @name Block types for P/B frames */
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enum TransformTypes {
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TT_8X4, //Both halves
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TT_4X8, //Both halves
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CS_HIGH_MOT_INTRA = 0,
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/** @name Overlap conditions for Advanced Profile */
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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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typedef struct VC1Context{
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/** Simple/Main Profile sequence header */
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int res_sm; ///< reserved, 2b
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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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int res_rtm_flag; ///< reserved, set to 1
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int reserved; ///< reserved
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/** Advanced Profile */
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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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/** Sequence header data for all Profiles
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* TODO: choose between ints, uint8_ts and monobit flags
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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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/** Frame decoding info for all profiles */
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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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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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/** AC coding set indexes
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* @see 8.1.1.10, p(1)10
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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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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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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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* -# 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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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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uint8_t rangeredfrm; ///< out_sample = CLIP((in_sample-128)*2+128)
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/** Frame decoding info for Advanced profile */
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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 rptfrm, tff, rff;
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uint16_t bottomrightx;
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uint16_t bottomrighty;
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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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uint8_t* over_flags_plane; ///< Overflags bitplane
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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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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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/** 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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static av_always_inline const uint8_t* find_next_marker(const uint8_t *src, const uint8_t *end)
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uint32_t mrk = 0xFFFFFFFF;
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if(end-src < 4) return end;
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mrk = (mrk << 8) | *src++;
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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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for(dsize = 0; dsize < size; dsize++) *dst++ = *src++;
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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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* 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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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 */
added
removed
libavcodec/vc1.h
