/* * Chinese AVS video (AVS1-P2, JiZhun profile) decoder. * Copyright (c) 2006 Stefan Gehrer * * 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 CAVS_H #define CAVS_H #include "dsputil.h" #include "mpegvideo.h" #define SLICE_MIN_START_CODE 0x00000101 #define SLICE_MAX_START_CODE 0x000001af #define EXT_START_CODE 0x000001b5 #define USER_START_CODE 0x000001b2 #define CAVS_START_CODE 0x000001b0 #define PIC_I_START_CODE 0x000001b3 #define PIC_PB_START_CODE 0x000001b6 #define A_AVAIL 1 #define B_AVAIL 2 #define C_AVAIL 4 #define D_AVAIL 8 #define NOT_AVAIL -1 #define REF_INTRA -2 #define REF_DIR -3 #define ESCAPE_CODE 59 #define FWD0 0x01 #define FWD1 0x02 #define BWD0 0x04 #define BWD1 0x08 #define SYM0 0x10 #define SYM1 0x20 #define SPLITH 0x40 #define SPLITV 0x80 #define MV_BWD_OFFS 12 #define MV_STRIDE 4 enum mb_t { I_8X8 = 0, P_SKIP, P_16X16, P_16X8, P_8X16, P_8X8, B_SKIP, B_DIRECT, B_FWD_16X16, B_BWD_16X16, B_SYM_16X16, B_8X8 = 29 }; enum sub_mb_t { B_SUB_DIRECT, B_SUB_FWD, B_SUB_BWD, B_SUB_SYM }; enum intra_luma_t { INTRA_L_VERT, INTRA_L_HORIZ, INTRA_L_LP, INTRA_L_DOWN_LEFT, INTRA_L_DOWN_RIGHT, INTRA_L_LP_LEFT, INTRA_L_LP_TOP, INTRA_L_DC_128 }; enum intra_chroma_t { INTRA_C_LP, INTRA_C_HORIZ, INTRA_C_VERT, INTRA_C_PLANE, INTRA_C_LP_LEFT, INTRA_C_LP_TOP, INTRA_C_DC_128, }; enum mv_pred_t { MV_PRED_MEDIAN, MV_PRED_LEFT, MV_PRED_TOP, MV_PRED_TOPRIGHT, MV_PRED_PSKIP, MV_PRED_BSKIP }; enum block_t { BLK_16X16, BLK_16X8, BLK_8X16, BLK_8X8 }; enum mv_loc_t { MV_FWD_D3 = 0, MV_FWD_B2, MV_FWD_B3, MV_FWD_C2, MV_FWD_A1, MV_FWD_X0, MV_FWD_X1, MV_FWD_A3 = 8, MV_FWD_X2, MV_FWD_X3, MV_BWD_D3 = MV_BWD_OFFS, MV_BWD_B2, MV_BWD_B3, MV_BWD_C2, MV_BWD_A1, MV_BWD_X0, MV_BWD_X1, MV_BWD_A3 = MV_BWD_OFFS+8, MV_BWD_X2, MV_BWD_X3 }; DECLARE_ALIGNED_8(typedef, struct) { int16_t x; int16_t y; int16_t dist; int16_t ref; } vector_t; typedef struct residual_vlc_t { int8_t rltab[59][3]; int8_t level_add[27]; int8_t golomb_order; int inc_limit; int8_t max_run; } residual_vlc_t; typedef struct { MpegEncContext s; Picture picture; ///< currently decoded frame Picture DPB[2]; ///< reference frames int dist[2]; ///< temporal distances from current frame to ref frames int profile, level; int aspect_ratio; int mb_width, mb_height; int pic_type; int progressive; int pic_structure; int skip_mode_flag; ///< select between skip_count or one skip_flag per MB int loop_filter_disable; int alpha_offset, beta_offset; int ref_flag; int mbx, mby; ///< macroblock coordinates int flags; ///< availability flags of neighbouring macroblocks int stc; ///< last start code uint8_t *cy, *cu, *cv; ///< current MB sample pointers int left_qp; uint8_t *top_qp; /** mv motion vector cache 0: D3 B2 B3 C2 4: A1 X0 X1 - 8: A3 X2 X3 - X are the vectors in the current macroblock (5,6,9,10) A is the macroblock to the left (4,8) B is the macroblock to the top (1,2) C is the macroblock to the top-right (3) D is the macroblock to the top-left (0) the same is repeated for backward motion vectors */ vector_t mv[2*4*3]; vector_t *top_mv[2]; vector_t *col_mv; /** luma pred mode cache 0: -- B2 B3 3: A1 X0 X1 6: A3 X2 X3 */ int pred_mode_Y[3*3]; int *top_pred_Y; int l_stride, c_stride; int luma_scan[4]; int qp; int qp_fixed; int cbp; ScanTable scantable; /** intra prediction is done with un-deblocked samples they are saved here before deblocking the MB */ uint8_t *top_border_y, *top_border_u, *top_border_v; uint8_t left_border_y[26], left_border_u[10], left_border_v[10]; uint8_t intern_border_y[26]; uint8_t topleft_border_y, topleft_border_u, topleft_border_v; void (*intra_pred_l[8])(uint8_t *d,uint8_t *top,uint8_t *left,int stride); void (*intra_pred_c[7])(uint8_t *d,uint8_t *top,uint8_t *left,int stride); uint8_t *col_type_base; uint8_t *col_type; /* scaling factors for MV prediction */ int sym_factor; ///< for scaling in symmetrical B block int direct_den[2]; ///< for scaling in direct B block int scale_den[2]; ///< for scaling neighbouring MVs int got_keyframe; DCTELEM *block; } AVSContext; extern const int_fast8_t ff_left_modifier_l[8]; extern const int_fast8_t ff_top_modifier_l[8]; extern const int_fast8_t ff_left_modifier_c[7]; extern const int_fast8_t ff_top_modifier_c[7]; extern const vector_t ff_cavs_intra_mv; extern const vector_t ff_cavs_un_mv; static inline void load_intra_pred_luma(AVSContext *h, uint8_t *top, uint8_t **left, int block) { int i; switch(block) { case 0: *left = h->left_border_y; h->left_border_y[0] = h->left_border_y[1]; memset(&h->left_border_y[17],h->left_border_y[16],9); memcpy(&top[1],&h->top_border_y[h->mbx*16],16); top[17] = top[16]; top[0] = top[1]; if((h->flags & A_AVAIL) && (h->flags & B_AVAIL)) h->left_border_y[0] = top[0] = h->topleft_border_y; break; case 1: *left = h->intern_border_y; for(i=0;i<8;i++) h->intern_border_y[i+1] = *(h->cy + 7 + i*h->l_stride); memset(&h->intern_border_y[9],h->intern_border_y[8],9); h->intern_border_y[0] = h->intern_border_y[1]; memcpy(&top[1],&h->top_border_y[h->mbx*16+8],8); if(h->flags & C_AVAIL) memcpy(&top[9],&h->top_border_y[(h->mbx + 1)*16],8); else memset(&top[9],top[8],9); top[17] = top[16]; top[0] = top[1]; if(h->flags & B_AVAIL) h->intern_border_y[0] = top[0] = h->top_border_y[h->mbx*16+7]; break; case 2: *left = &h->left_border_y[8]; memcpy(&top[1],h->cy + 7*h->l_stride,16); top[17] = top[16]; top[0] = top[1]; if(h->flags & A_AVAIL) top[0] = h->left_border_y[8]; break; case 3: *left = &h->intern_border_y[8]; for(i=0;i<8;i++) h->intern_border_y[i+9] = *(h->cy + 7 + (i+8)*h->l_stride); memset(&h->intern_border_y[17],h->intern_border_y[16],9); memcpy(&top[0],h->cy + 7 + 7*h->l_stride,9); memset(&top[9],top[8],9); break; } } static inline void load_intra_pred_chroma(AVSContext *h) { /* extend borders by one pixel */ h->left_border_u[9] = h->left_border_u[8]; h->left_border_v[9] = h->left_border_v[8]; h->top_border_u[h->mbx*10+9] = h->top_border_u[h->mbx*10+8]; h->top_border_v[h->mbx*10+9] = h->top_border_v[h->mbx*10+8]; if(h->mbx && h->mby) { h->top_border_u[h->mbx*10] = h->left_border_u[0] = h->topleft_border_u; h->top_border_v[h->mbx*10] = h->left_border_v[0] = h->topleft_border_v; } else { h->left_border_u[0] = h->left_border_u[1]; h->left_border_v[0] = h->left_border_v[1]; h->top_border_u[h->mbx*10] = h->top_border_u[h->mbx*10+1]; h->top_border_v[h->mbx*10] = h->top_border_v[h->mbx*10+1]; } } static inline void modify_pred(const int_fast8_t *mod_table, int *mode) { *mode = mod_table[*mode]; if(*mode < 0) { av_log(NULL, AV_LOG_ERROR, "Illegal intra prediction mode\n"); *mode = 0; } } static inline void modify_mb_i(AVSContext *h, int *pred_mode_uv) { /* save pred modes before they get modified */ h->pred_mode_Y[3] = h->pred_mode_Y[5]; h->pred_mode_Y[6] = h->pred_mode_Y[8]; h->top_pred_Y[h->mbx*2+0] = h->pred_mode_Y[7]; h->top_pred_Y[h->mbx*2+1] = h->pred_mode_Y[8]; /* modify pred modes according to availability of neighbour samples */ if(!(h->flags & A_AVAIL)) { modify_pred(ff_left_modifier_l, &h->pred_mode_Y[4] ); modify_pred(ff_left_modifier_l, &h->pred_mode_Y[7] ); modify_pred(ff_left_modifier_c, pred_mode_uv ); } if(!(h->flags & B_AVAIL)) { modify_pred(ff_top_modifier_l, &h->pred_mode_Y[4] ); modify_pred(ff_top_modifier_l, &h->pred_mode_Y[5] ); modify_pred(ff_top_modifier_c, pred_mode_uv ); } } static inline void set_intra_mode_default(AVSContext *h) { h->pred_mode_Y[3] = h->pred_mode_Y[6] = INTRA_L_LP; h->top_pred_Y[h->mbx*2+0] = h->top_pred_Y[h->mbx*2+1] = INTRA_L_LP; } static inline void set_mvs(vector_t *mv, enum block_t size) { switch(size) { case BLK_16X16: mv[MV_STRIDE ] = mv[0]; mv[MV_STRIDE+1] = mv[0]; case BLK_16X8: mv[1] = mv[0]; break; case BLK_8X16: mv[MV_STRIDE] = mv[0]; break; } } static inline void set_mv_intra(AVSContext *h) { h->mv[MV_FWD_X0] = ff_cavs_intra_mv; set_mvs(&h->mv[MV_FWD_X0], BLK_16X16); h->mv[MV_BWD_X0] = ff_cavs_intra_mv; set_mvs(&h->mv[MV_BWD_X0], BLK_16X16); if(h->pic_type != FF_B_TYPE) *h->col_type = I_8X8; } /** * initialise predictors for motion vectors and intra prediction */ static inline void init_mb(AVSContext *h) { int i; /* copy predictors from top line (MB B and C) into cache */ for(i=0;i<3;i++) { h->mv[MV_FWD_B2+i] = h->top_mv[0][h->mbx*2+i]; h->mv[MV_BWD_B2+i] = h->top_mv[1][h->mbx*2+i]; } h->pred_mode_Y[1] = h->top_pred_Y[h->mbx*2+0]; h->pred_mode_Y[2] = h->top_pred_Y[h->mbx*2+1]; /* clear top predictors if MB B is not available */ if(!(h->flags & B_AVAIL)) { h->mv[MV_FWD_B2] = ff_cavs_un_mv; h->mv[MV_FWD_B3] = ff_cavs_un_mv; h->mv[MV_BWD_B2] = ff_cavs_un_mv; h->mv[MV_BWD_B3] = ff_cavs_un_mv; h->pred_mode_Y[1] = h->pred_mode_Y[2] = NOT_AVAIL; h->flags &= ~(C_AVAIL|D_AVAIL); } else if(h->mbx) { h->flags |= D_AVAIL; } if(h->mbx == h->mb_width-1) //MB C not available h->flags &= ~C_AVAIL; /* clear top-right predictors if MB C is not available */ if(!(h->flags & C_AVAIL)) { h->mv[MV_FWD_C2] = ff_cavs_un_mv; h->mv[MV_BWD_C2] = ff_cavs_un_mv; } /* clear top-left predictors if MB D is not available */ if(!(h->flags & D_AVAIL)) { h->mv[MV_FWD_D3] = ff_cavs_un_mv; h->mv[MV_BWD_D3] = ff_cavs_un_mv; } /* set pointer for co-located macroblock type */ h->col_type = &h->col_type_base[h->mby*h->mb_width + h->mbx]; } static inline void check_for_slice(AVSContext *h); /** * save predictors for later macroblocks and increase * macroblock address * @returns 0 if end of frame is reached, 1 otherwise */ static inline int next_mb(AVSContext *h) { int i; h->flags |= A_AVAIL; h->cy += 16; h->cu += 8; h->cv += 8; /* copy mvs as predictors to the left */ for(i=0;i<=20;i+=4) h->mv[i] = h->mv[i+2]; /* copy bottom mvs from cache to top line */ h->top_mv[0][h->mbx*2+0] = h->mv[MV_FWD_X2]; h->top_mv[0][h->mbx*2+1] = h->mv[MV_FWD_X3]; h->top_mv[1][h->mbx*2+0] = h->mv[MV_BWD_X2]; h->top_mv[1][h->mbx*2+1] = h->mv[MV_BWD_X3]; /* next MB address */ h->mbx++; if(h->mbx == h->mb_width) { //new mb line h->flags = B_AVAIL|C_AVAIL; /* clear left pred_modes */ h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL; /* clear left mv predictors */ for(i=0;i<=20;i+=4) h->mv[i] = ff_cavs_un_mv; h->mbx = 0; h->mby++; /* re-calculate sample pointers */ h->cy = h->picture.data[0] + h->mby*16*h->l_stride; h->cu = h->picture.data[1] + h->mby*8*h->c_stride; h->cv = h->picture.data[2] + h->mby*8*h->c_stride; if(h->mby == h->mb_height) { //frame end return 0; } else { //check_for_slice(h); } } return 1; } #endif /* CAVS_H */