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* Chinese AVS video (AVS1-P2, JiZhun profile) decoder.
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* Copyright (c) 2006 Stefan Gehrer <stefan.gehrer@gmx.de>
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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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#define SLICE_MIN_START_CODE 0x00000101
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#define SLICE_MAX_START_CODE 0x000001af
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#define EXT_START_CODE 0x000001b5
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#define USER_START_CODE 0x000001b2
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#define CAVS_START_CODE 0x000001b0
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#define PIC_I_START_CODE 0x000001b3
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#define PIC_PB_START_CODE 0x000001b6
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#define ESCAPE_CODE 59
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#define MV_BWD_OFFS 12
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MV_BWD_D3 = MV_BWD_OFFS,
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MV_BWD_A3 = MV_BWD_OFFS+8,
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DECLARE_ALIGNED_8(typedef, struct) {
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typedef struct dec_2dvlc_t {
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int8_t level_add[27];
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Picture picture; ///< currently decoded frame
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Picture DPB[2]; ///< reference frames
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int dist[2]; ///< temporal distances from current frame to ref frames
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int mb_width, mb_height;
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int skip_mode_flag; ///< select between skip_count or one skip_flag per MB
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int loop_filter_disable;
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int alpha_offset, beta_offset;
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int mbx, mby; ///< macroblock coordinates
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int flags; ///< availability flags of neighbouring macroblocks
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int stc; ///< last start code
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uint8_t *cy, *cu, *cv; ///< current MB sample pointers
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/** mv motion vector cache
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X are the vectors in the current macroblock (5,6,9,10)
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A is the macroblock to the left (4,8)
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B is the macroblock to the top (1,2)
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C is the macroblock to the top-right (3)
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D is the macroblock to the top-left (0)
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the same is repeated for backward motion vectors */
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/** luma pred mode cache
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int pred_mode_Y[3*3];
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int l_stride, c_stride;
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/** intra prediction is done with un-deblocked samples
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they are saved here before deblocking the MB */
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uint8_t *top_border_y, *top_border_u, *top_border_v;
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uint8_t left_border_y[26], left_border_u[10], left_border_v[10];
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uint8_t intern_border_y[26];
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uint8_t topleft_border_y, topleft_border_u, topleft_border_v;
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void (*intra_pred_l[8])(uint8_t *d,uint8_t *top,uint8_t *left,int stride);
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void (*intra_pred_c[7])(uint8_t *d,uint8_t *top,uint8_t *left,int stride);
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uint8_t *col_type_base;
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/* scaling factors for MV prediction */
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int sym_factor; ///< for scaling in symmetrical B block
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int direct_den[2]; ///< for scaling in direct B block
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int scale_den[2]; ///< for scaling neighbouring MVs
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extern const uint8_t ff_cavs_dequant_shift[64];
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extern const uint16_t ff_cavs_dequant_mul[64];
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extern const dec_2dvlc_t ff_cavs_intra_dec[7];
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extern const dec_2dvlc_t ff_cavs_inter_dec[7];
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extern const dec_2dvlc_t ff_cavs_chroma_dec[5];
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extern const uint8_t ff_cavs_chroma_qp[64];
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extern const uint8_t ff_cavs_scan3x3[4];
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extern const uint8_t ff_cavs_partition_flags[30];
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extern const int_fast8_t ff_left_modifier_l[8];
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extern const int_fast8_t ff_top_modifier_l[8];
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extern const int_fast8_t ff_left_modifier_c[7];
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extern const int_fast8_t ff_top_modifier_c[7];
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extern const vector_t ff_cavs_intra_mv;
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extern const vector_t ff_cavs_un_mv;
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extern const vector_t ff_cavs_dir_mv;
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static inline void modify_pred(const int_fast8_t *mod_table, int *mode) {
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*mode = mod_table[*mode];
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av_log(NULL, AV_LOG_ERROR, "Illegal intra prediction mode\n");
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static inline void set_intra_mode_default(AVSContext *h) {
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h->pred_mode_Y[3] = h->pred_mode_Y[6] = INTRA_L_LP;
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h->top_pred_Y[h->mbx*2+0] = h->top_pred_Y[h->mbx*2+1] = INTRA_L_LP;
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static inline void set_mvs(vector_t *mv, enum block_t size) {
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mv[MV_STRIDE ] = mv[0];
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mv[MV_STRIDE+1] = mv[0];
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mv[MV_STRIDE] = mv[0];
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static inline void set_mv_intra(AVSContext *h) {
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h->mv[MV_FWD_X0] = ff_cavs_intra_mv;
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set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
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h->mv[MV_BWD_X0] = ff_cavs_intra_mv;
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set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);
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if(h->pic_type != FF_B_TYPE)
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*h->col_type = I_8X8;
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static inline int dequant(AVSContext *h, DCTELEM *level_buf, uint8_t *run_buf,
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DCTELEM *dst, int mul, int shift, int coeff_num) {
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int round = 1 << (shift - 1);
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const uint8_t *scantab = h->scantable.permutated;
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/* inverse scan and dequantization */
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while(--coeff_num >= 0){
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pos += run_buf[coeff_num];
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av_log(h->s.avctx, AV_LOG_ERROR,
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"position out of block bounds at pic %d MB(%d,%d)\n",
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h->picture.poc, h->mbx, h->mby);
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dst[scantab[pos]] = (level_buf[coeff_num]*mul + round) >> shift;
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void ff_cavs_filter(AVSContext *h, enum mb_t mb_type);
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void ff_cavs_load_intra_pred_luma(AVSContext *h, uint8_t *top, uint8_t **left,
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void ff_cavs_load_intra_pred_chroma(AVSContext *h);
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void ff_cavs_modify_mb_i(AVSContext *h, int *pred_mode_uv);
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void ff_cavs_inter(AVSContext *h, enum mb_t mb_type);
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void ff_cavs_mv(AVSContext *h, enum mv_loc_t nP, enum mv_loc_t nC,
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enum mv_pred_t mode, enum block_t size, int ref);
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void ff_cavs_init_mb(AVSContext *h);
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int ff_cavs_next_mb(AVSContext *h);
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void ff_cavs_init_pic(AVSContext *h);
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void ff_cavs_init_top_lines(AVSContext *h);
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int ff_cavs_init(AVCodecContext *avctx);
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int ff_cavs_end (AVCodecContext *avctx);