1/*
2 * Chinese AVS video (AVS1-P2, JiZhun profile) decoder.
3 * Copyright (c) 2006  Stefan Gehrer <stefan.gehrer@gmx.de>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#ifndef AVCODEC_CAVS_H
23#define AVCODEC_CAVS_H
24
25#include "dsputil.h"
26#include "mpegvideo.h"
27
28#define SLICE_MAX_START_CODE    0x000001af
29#define EXT_START_CODE          0x000001b5
30#define USER_START_CODE         0x000001b2
31#define CAVS_START_CODE         0x000001b0
32#define PIC_I_START_CODE        0x000001b3
33#define PIC_PB_START_CODE       0x000001b6
34
35#define A_AVAIL                          1
36#define B_AVAIL                          2
37#define C_AVAIL                          4
38#define D_AVAIL                          8
39#define NOT_AVAIL                       -1
40#define REF_INTRA                       -2
41#define REF_DIR                         -3
42
43#define ESCAPE_CODE                     59
44
45#define FWD0                          0x01
46#define FWD1                          0x02
47#define BWD0                          0x04
48#define BWD1                          0x08
49#define SYM0                          0x10
50#define SYM1                          0x20
51#define SPLITH                        0x40
52#define SPLITV                        0x80
53
54#define MV_BWD_OFFS                     12
55#define MV_STRIDE                        4
56
57enum cavs_mb {
58  I_8X8 = 0,
59  P_SKIP,
60  P_16X16,
61  P_16X8,
62  P_8X16,
63  P_8X8,
64  B_SKIP,
65  B_DIRECT,
66  B_FWD_16X16,
67  B_BWD_16X16,
68  B_SYM_16X16,
69  B_8X8 = 29
70};
71
72enum cavs_sub_mb {
73  B_SUB_DIRECT,
74  B_SUB_FWD,
75  B_SUB_BWD,
76  B_SUB_SYM
77};
78
79enum cavs_intra_luma {
80  INTRA_L_VERT,
81  INTRA_L_HORIZ,
82  INTRA_L_LP,
83  INTRA_L_DOWN_LEFT,
84  INTRA_L_DOWN_RIGHT,
85  INTRA_L_LP_LEFT,
86  INTRA_L_LP_TOP,
87  INTRA_L_DC_128
88};
89
90enum cavs_intra_chroma {
91  INTRA_C_LP,
92  INTRA_C_HORIZ,
93  INTRA_C_VERT,
94  INTRA_C_PLANE,
95  INTRA_C_LP_LEFT,
96  INTRA_C_LP_TOP,
97  INTRA_C_DC_128,
98};
99
100enum cavs_mv_pred {
101  MV_PRED_MEDIAN,
102  MV_PRED_LEFT,
103  MV_PRED_TOP,
104  MV_PRED_TOPRIGHT,
105  MV_PRED_PSKIP,
106  MV_PRED_BSKIP
107};
108
109enum cavs_block {
110  BLK_16X16,
111  BLK_16X8,
112  BLK_8X16,
113  BLK_8X8
114};
115
116enum cavs_mv_loc {
117  MV_FWD_D3 = 0,
118  MV_FWD_B2,
119  MV_FWD_B3,
120  MV_FWD_C2,
121  MV_FWD_A1,
122  MV_FWD_X0,
123  MV_FWD_X1,
124  MV_FWD_A3 = 8,
125  MV_FWD_X2,
126  MV_FWD_X3,
127  MV_BWD_D3 = MV_BWD_OFFS,
128  MV_BWD_B2,
129  MV_BWD_B3,
130  MV_BWD_C2,
131  MV_BWD_A1,
132  MV_BWD_X0,
133  MV_BWD_X1,
134  MV_BWD_A3 = MV_BWD_OFFS+8,
135  MV_BWD_X2,
136  MV_BWD_X3
137};
138
139DECLARE_ALIGNED(8, typedef, struct) {
140    int16_t x;
141    int16_t y;
142    int16_t dist;
143    int16_t ref;
144} cavs_vector;
145
146struct dec_2dvlc {
147  int8_t rltab[59][3];
148  int8_t level_add[27];
149  int8_t golomb_order;
150  int inc_limit;
151  int8_t max_run;
152};
153
154typedef struct {
155    MpegEncContext s;
156    Picture picture; ///< currently decoded frame
157    Picture DPB[2];  ///< reference frames
158    int dist[2];     ///< temporal distances from current frame to ref frames
159    int profile, level;
160    int aspect_ratio;
161    int mb_width, mb_height;
162    int pic_type;
163    int stream_revision; ///<0 for samples from 2006, 1 for rm52j encoder
164    int progressive;
165    int pic_structure;
166    int skip_mode_flag; ///< select between skip_count or one skip_flag per MB
167    int loop_filter_disable;
168    int alpha_offset, beta_offset;
169    int ref_flag;
170    int mbx, mby, mbidx; ///< macroblock coordinates
171    int flags;         ///< availability flags of neighbouring macroblocks
172    int stc;           ///< last start code
173    uint8_t *cy, *cu, *cv; ///< current MB sample pointers
174    int left_qp;
175    uint8_t *top_qp;
176
177    /** mv motion vector cache
178       0:    D3  B2  B3  C2
179       4:    A1  X0  X1   -
180       8:    A3  X2  X3   -
181
182       X are the vectors in the current macroblock (5,6,9,10)
183       A is the macroblock to the left (4,8)
184       B is the macroblock to the top (1,2)
185       C is the macroblock to the top-right (3)
186       D is the macroblock to the top-left (0)
187
188       the same is repeated for backward motion vectors */
189    cavs_vector mv[2*4*3];
190    cavs_vector *top_mv[2];
191    cavs_vector *col_mv;
192
193    /** luma pred mode cache
194       0:    --  B2  B3
195       3:    A1  X0  X1
196       6:    A3  X2  X3   */
197    int pred_mode_Y[3*3];
198    int *top_pred_Y;
199    int l_stride, c_stride;
200    int luma_scan[4];
201    int qp;
202    int qp_fixed;
203    int cbp;
204    ScanTable scantable;
205
206    /** intra prediction is done with un-deblocked samples
207     they are saved here before deblocking the MB  */
208    uint8_t *top_border_y, *top_border_u, *top_border_v;
209    uint8_t left_border_y[26], left_border_u[10], left_border_v[10];
210    uint8_t intern_border_y[26];
211    uint8_t topleft_border_y, topleft_border_u, topleft_border_v;
212
213    void (*intra_pred_l[8])(uint8_t *d,uint8_t *top,uint8_t *left,int stride);
214    void (*intra_pred_c[7])(uint8_t *d,uint8_t *top,uint8_t *left,int stride);
215    uint8_t *col_type_base;
216
217    /* scaling factors for MV prediction */
218    int sym_factor;    ///< for scaling in symmetrical B block
219    int direct_den[2]; ///< for scaling in direct B block
220    int scale_den[2];  ///< for scaling neighbouring MVs
221
222    int got_keyframe;
223    DCTELEM *block;
224} AVSContext;
225
226extern const uint8_t     ff_cavs_dequant_shift[64];
227extern const uint16_t    ff_cavs_dequant_mul[64];
228extern const struct dec_2dvlc ff_cavs_intra_dec[7];
229extern const struct dec_2dvlc ff_cavs_inter_dec[7];
230extern const struct dec_2dvlc ff_cavs_chroma_dec[5];
231extern const uint8_t     ff_cavs_chroma_qp[64];
232extern const uint8_t     ff_cavs_scan3x3[4];
233extern const uint8_t     ff_cavs_partition_flags[30];
234extern const int_fast8_t ff_left_modifier_l[8];
235extern const int_fast8_t ff_top_modifier_l[8];
236extern const int_fast8_t ff_left_modifier_c[7];
237extern const int_fast8_t ff_top_modifier_c[7];
238extern const cavs_vector ff_cavs_intra_mv;
239extern const cavs_vector ff_cavs_un_mv;
240extern const cavs_vector ff_cavs_dir_mv;
241
242static inline void modify_pred(const int_fast8_t *mod_table, int *mode) {
243    *mode = mod_table[*mode];
244    if(*mode < 0) {
245        av_log(NULL, AV_LOG_ERROR, "Illegal intra prediction mode\n");
246        *mode = 0;
247    }
248}
249
250static inline void set_intra_mode_default(AVSContext *h) {
251    if(h->stream_revision > 0) {
252        h->pred_mode_Y[3] =  h->pred_mode_Y[6] = NOT_AVAIL;
253        h->top_pred_Y[h->mbx*2+0] = h->top_pred_Y[h->mbx*2+1] = NOT_AVAIL;
254    } else {
255        h->pred_mode_Y[3] =  h->pred_mode_Y[6] = INTRA_L_LP;
256        h->top_pred_Y[h->mbx*2+0] = h->top_pred_Y[h->mbx*2+1] = INTRA_L_LP;
257    }
258}
259
260static inline void set_mvs(cavs_vector *mv, enum cavs_block size) {
261    switch(size) {
262    case BLK_16X16:
263        mv[MV_STRIDE  ] = mv[0];
264        mv[MV_STRIDE+1] = mv[0];
265    case BLK_16X8:
266        mv[1] = mv[0];
267        break;
268    case BLK_8X16:
269        mv[MV_STRIDE] = mv[0];
270        break;
271    }
272}
273
274static inline void set_mv_intra(AVSContext *h) {
275    h->mv[MV_FWD_X0] = ff_cavs_intra_mv;
276    set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
277    h->mv[MV_BWD_X0] = ff_cavs_intra_mv;
278    set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);
279    if(h->pic_type != FF_B_TYPE)
280        h->col_type_base[h->mbidx] = I_8X8;
281}
282
283static inline int dequant(AVSContext *h, DCTELEM *level_buf, uint8_t *run_buf,
284                          DCTELEM *dst, int mul, int shift, int coeff_num) {
285    int round = 1 << (shift - 1);
286    int pos = -1;
287    const uint8_t *scantab = h->scantable.permutated;
288
289    /* inverse scan and dequantization */
290    while(--coeff_num >= 0){
291        pos += run_buf[coeff_num];
292        if(pos > 63) {
293            av_log(h->s.avctx, AV_LOG_ERROR,
294                "position out of block bounds at pic %d MB(%d,%d)\n",
295                h->picture.poc, h->mbx, h->mby);
296            return -1;
297        }
298        dst[scantab[pos]] = (level_buf[coeff_num]*mul + round) >> shift;
299    }
300    return 0;
301}
302
303void ff_cavs_filter(AVSContext *h, enum cavs_mb mb_type);
304void ff_cavs_load_intra_pred_luma(AVSContext *h, uint8_t *top, uint8_t **left,
305                                  int block);
306void ff_cavs_load_intra_pred_chroma(AVSContext *h);
307void ff_cavs_modify_mb_i(AVSContext *h, int *pred_mode_uv);
308void ff_cavs_inter(AVSContext *h, enum cavs_mb mb_type);
309void ff_cavs_mv(AVSContext *h, enum cavs_mv_loc nP, enum cavs_mv_loc nC,
310                enum cavs_mv_pred mode, enum cavs_block size, int ref);
311void ff_cavs_init_mb(AVSContext *h);
312int  ff_cavs_next_mb(AVSContext *h);
313void ff_cavs_init_pic(AVSContext *h);
314void ff_cavs_init_top_lines(AVSContext *h);
315int ff_cavs_init(AVCodecContext *avctx);
316int ff_cavs_end (AVCodecContext *avctx);
317
318#endif /* AVCODEC_CAVS_H */
319