Libav
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00001 /* 00002 * Chinese AVS video (AVS1-P2, JiZhun profile) decoder. 00003 * Copyright (c) 2006 Stefan Gehrer <stefan.gehrer@gmx.de> 00004 * 00005 * This file is part of FFmpeg. 00006 * 00007 * FFmpeg is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * FFmpeg is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with FFmpeg; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00022 #ifndef AVCODEC_CAVS_H 00023 #define AVCODEC_CAVS_H 00024 00025 #include "dsputil.h" 00026 #include "mpegvideo.h" 00027 00028 #define SLICE_MAX_START_CODE 0x000001af 00029 #define EXT_START_CODE 0x000001b5 00030 #define USER_START_CODE 0x000001b2 00031 #define CAVS_START_CODE 0x000001b0 00032 #define PIC_I_START_CODE 0x000001b3 00033 #define PIC_PB_START_CODE 0x000001b6 00034 00035 #define A_AVAIL 1 00036 #define B_AVAIL 2 00037 #define C_AVAIL 4 00038 #define D_AVAIL 8 00039 #define NOT_AVAIL -1 00040 #define REF_INTRA -2 00041 #define REF_DIR -3 00042 00043 #define ESCAPE_CODE 59 00044 00045 #define FWD0 0x01 00046 #define FWD1 0x02 00047 #define BWD0 0x04 00048 #define BWD1 0x08 00049 #define SYM0 0x10 00050 #define SYM1 0x20 00051 #define SPLITH 0x40 00052 #define SPLITV 0x80 00053 00054 #define MV_BWD_OFFS 12 00055 #define MV_STRIDE 4 00056 00057 enum cavs_mb { 00058 I_8X8 = 0, 00059 P_SKIP, 00060 P_16X16, 00061 P_16X8, 00062 P_8X16, 00063 P_8X8, 00064 B_SKIP, 00065 B_DIRECT, 00066 B_FWD_16X16, 00067 B_BWD_16X16, 00068 B_SYM_16X16, 00069 B_8X8 = 29 00070 }; 00071 00072 enum cavs_sub_mb { 00073 B_SUB_DIRECT, 00074 B_SUB_FWD, 00075 B_SUB_BWD, 00076 B_SUB_SYM 00077 }; 00078 00079 enum cavs_intra_luma { 00080 INTRA_L_VERT, 00081 INTRA_L_HORIZ, 00082 INTRA_L_LP, 00083 INTRA_L_DOWN_LEFT, 00084 INTRA_L_DOWN_RIGHT, 00085 INTRA_L_LP_LEFT, 00086 INTRA_L_LP_TOP, 00087 INTRA_L_DC_128 00088 }; 00089 00090 enum cavs_intra_chroma { 00091 INTRA_C_LP, 00092 INTRA_C_HORIZ, 00093 INTRA_C_VERT, 00094 INTRA_C_PLANE, 00095 INTRA_C_LP_LEFT, 00096 INTRA_C_LP_TOP, 00097 INTRA_C_DC_128, 00098 }; 00099 00100 enum cavs_mv_pred { 00101 MV_PRED_MEDIAN, 00102 MV_PRED_LEFT, 00103 MV_PRED_TOP, 00104 MV_PRED_TOPRIGHT, 00105 MV_PRED_PSKIP, 00106 MV_PRED_BSKIP 00107 }; 00108 00109 enum cavs_block { 00110 BLK_16X16, 00111 BLK_16X8, 00112 BLK_8X16, 00113 BLK_8X8 00114 }; 00115 00116 enum cavs_mv_loc { 00117 MV_FWD_D3 = 0, 00118 MV_FWD_B2, 00119 MV_FWD_B3, 00120 MV_FWD_C2, 00121 MV_FWD_A1, 00122 MV_FWD_X0, 00123 MV_FWD_X1, 00124 MV_FWD_A3 = 8, 00125 MV_FWD_X2, 00126 MV_FWD_X3, 00127 MV_BWD_D3 = MV_BWD_OFFS, 00128 MV_BWD_B2, 00129 MV_BWD_B3, 00130 MV_BWD_C2, 00131 MV_BWD_A1, 00132 MV_BWD_X0, 00133 MV_BWD_X1, 00134 MV_BWD_A3 = MV_BWD_OFFS+8, 00135 MV_BWD_X2, 00136 MV_BWD_X3 00137 }; 00138 00139 DECLARE_ALIGNED(8, typedef, struct) { 00140 int16_t x; 00141 int16_t y; 00142 int16_t dist; 00143 int16_t ref; 00144 } cavs_vector; 00145 00146 struct dec_2dvlc { 00147 int8_t rltab[59][3]; 00148 int8_t level_add[27]; 00149 int8_t golomb_order; 00150 int inc_limit; 00151 int8_t max_run; 00152 }; 00153 00154 typedef struct { 00155 MpegEncContext s; 00156 Picture picture; 00157 Picture DPB[2]; 00158 int dist[2]; 00159 int profile, level; 00160 int aspect_ratio; 00161 int mb_width, mb_height; 00162 int pic_type; 00163 int stream_revision; 00164 int progressive; 00165 int pic_structure; 00166 int skip_mode_flag; 00167 int loop_filter_disable; 00168 int alpha_offset, beta_offset; 00169 int ref_flag; 00170 int mbx, mby, mbidx; 00171 int flags; 00172 int stc; 00173 uint8_t *cy, *cu, *cv; 00174 int left_qp; 00175 uint8_t *top_qp; 00176 00189 cavs_vector mv[2*4*3]; 00190 cavs_vector *top_mv[2]; 00191 cavs_vector *col_mv; 00192 00197 int pred_mode_Y[3*3]; 00198 int *top_pred_Y; 00199 int l_stride, c_stride; 00200 int luma_scan[4]; 00201 int qp; 00202 int qp_fixed; 00203 int cbp; 00204 ScanTable scantable; 00205 00208 uint8_t *top_border_y, *top_border_u, *top_border_v; 00209 uint8_t left_border_y[26], left_border_u[10], left_border_v[10]; 00210 uint8_t intern_border_y[26]; 00211 uint8_t topleft_border_y, topleft_border_u, topleft_border_v; 00212 00213 void (*intra_pred_l[8])(uint8_t *d,uint8_t *top,uint8_t *left,int stride); 00214 void (*intra_pred_c[7])(uint8_t *d,uint8_t *top,uint8_t *left,int stride); 00215 uint8_t *col_type_base; 00216 00217 /* scaling factors for MV prediction */ 00218 int sym_factor; 00219 int direct_den[2]; 00220 int scale_den[2]; 00221 00222 int got_keyframe; 00223 DCTELEM *block; 00224 } AVSContext; 00225 00226 extern const uint8_t ff_cavs_dequant_shift[64]; 00227 extern const uint16_t ff_cavs_dequant_mul[64]; 00228 extern const struct dec_2dvlc ff_cavs_intra_dec[7]; 00229 extern const struct dec_2dvlc ff_cavs_inter_dec[7]; 00230 extern const struct dec_2dvlc ff_cavs_chroma_dec[5]; 00231 extern const uint8_t ff_cavs_chroma_qp[64]; 00232 extern const uint8_t ff_cavs_scan3x3[4]; 00233 extern const uint8_t ff_cavs_partition_flags[30]; 00234 extern const int_fast8_t ff_left_modifier_l[8]; 00235 extern const int_fast8_t ff_top_modifier_l[8]; 00236 extern const int_fast8_t ff_left_modifier_c[7]; 00237 extern const int_fast8_t ff_top_modifier_c[7]; 00238 extern const cavs_vector ff_cavs_intra_mv; 00239 extern const cavs_vector ff_cavs_un_mv; 00240 extern const cavs_vector ff_cavs_dir_mv; 00241 00242 static inline void modify_pred(const int_fast8_t *mod_table, int *mode) { 00243 *mode = mod_table[*mode]; 00244 if(*mode < 0) { 00245 av_log(NULL, AV_LOG_ERROR, "Illegal intra prediction mode\n"); 00246 *mode = 0; 00247 } 00248 } 00249 00250 static inline void set_intra_mode_default(AVSContext *h) { 00251 if(h->stream_revision > 0) { 00252 h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL; 00253 h->top_pred_Y[h->mbx*2+0] = h->top_pred_Y[h->mbx*2+1] = NOT_AVAIL; 00254 } else { 00255 h->pred_mode_Y[3] = h->pred_mode_Y[6] = INTRA_L_LP; 00256 h->top_pred_Y[h->mbx*2+0] = h->top_pred_Y[h->mbx*2+1] = INTRA_L_LP; 00257 } 00258 } 00259 00260 static inline void set_mvs(cavs_vector *mv, enum cavs_block size) { 00261 switch(size) { 00262 case BLK_16X16: 00263 mv[MV_STRIDE ] = mv[0]; 00264 mv[MV_STRIDE+1] = mv[0]; 00265 case BLK_16X8: 00266 mv[1] = mv[0]; 00267 break; 00268 case BLK_8X16: 00269 mv[MV_STRIDE] = mv[0]; 00270 break; 00271 } 00272 } 00273 00274 static inline void set_mv_intra(AVSContext *h) { 00275 h->mv[MV_FWD_X0] = ff_cavs_intra_mv; 00276 set_mvs(&h->mv[MV_FWD_X0], BLK_16X16); 00277 h->mv[MV_BWD_X0] = ff_cavs_intra_mv; 00278 set_mvs(&h->mv[MV_BWD_X0], BLK_16X16); 00279 if(h->pic_type != FF_B_TYPE) 00280 h->col_type_base[h->mbidx] = I_8X8; 00281 } 00282 00283 static inline int dequant(AVSContext *h, DCTELEM *level_buf, uint8_t *run_buf, 00284 DCTELEM *dst, int mul, int shift, int coeff_num) { 00285 int round = 1 << (shift - 1); 00286 int pos = -1; 00287 const uint8_t *scantab = h->scantable.permutated; 00288 00289 /* inverse scan and dequantization */ 00290 while(--coeff_num >= 0){ 00291 pos += run_buf[coeff_num]; 00292 if(pos > 63) { 00293 av_log(h->s.avctx, AV_LOG_ERROR, 00294 "position out of block bounds at pic %d MB(%d,%d)\n", 00295 h->picture.poc, h->mbx, h->mby); 00296 return -1; 00297 } 00298 dst[scantab[pos]] = (level_buf[coeff_num]*mul + round) >> shift; 00299 } 00300 return 0; 00301 } 00302 00303 void ff_cavs_filter(AVSContext *h, enum cavs_mb mb_type); 00304 void ff_cavs_load_intra_pred_luma(AVSContext *h, uint8_t *top, uint8_t **left, 00305 int block); 00306 void ff_cavs_load_intra_pred_chroma(AVSContext *h); 00307 void ff_cavs_modify_mb_i(AVSContext *h, int *pred_mode_uv); 00308 void ff_cavs_inter(AVSContext *h, enum cavs_mb mb_type); 00309 void ff_cavs_mv(AVSContext *h, enum cavs_mv_loc nP, enum cavs_mv_loc nC, 00310 enum cavs_mv_pred mode, enum cavs_block size, int ref); 00311 void ff_cavs_init_mb(AVSContext *h); 00312 int ff_cavs_next_mb(AVSContext *h); 00313 void ff_cavs_init_pic(AVSContext *h); 00314 void ff_cavs_init_top_lines(AVSContext *h); 00315 int ff_cavs_init(AVCodecContext *avctx); 00316 int ff_cavs_end (AVCodecContext *avctx); 00317 00318 #endif /* AVCODEC_CAVS_H */