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Diffstat (limited to 'ffmpeg/libavcodec/vc1.h')
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1 files changed, 462 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/vc1.h b/ffmpeg/libavcodec/vc1.h new file mode 100644 index 0000000..596d4d3 --- /dev/null +++ b/ffmpeg/libavcodec/vc1.h @@ -0,0 +1,462 @@ +/* + * 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 */ |