1/*
2 * H263 internal header
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20#ifndef AVCODEC_H263_H
21#define AVCODEC_H263_H
22
23#include <stdint.h>
24#include "libavutil/rational.h"
25#include "get_bits.h"
26#include "mpegvideo.h"
27#include "rl.h"
28
29// The defines below define the number of bits that are read at once for
30// reading vlc values. Changing these may improve speed and data cache needs
31// be aware though that decreasing them may need the number of stages that is
32// passed to get_vlc* to be increased.
33#define INTRA_MCBPC_VLC_BITS 6
34#define INTER_MCBPC_VLC_BITS 7
35#define CBPY_VLC_BITS 6
36#define TEX_VLC_BITS 9
37
38extern const AVRational ff_h263_pixel_aspect[16];
39extern const uint8_t ff_h263_cbpy_tab[16][2];
40
41extern const uint8_t cbpc_b_tab[4][2];
42
43extern const uint8_t mvtab[33][2];
44
45extern const uint8_t ff_h263_intra_MCBPC_code[9];
46extern const uint8_t ff_h263_intra_MCBPC_bits[9];
47
48extern const uint8_t ff_h263_inter_MCBPC_code[28];
49extern const uint8_t ff_h263_inter_MCBPC_bits[28];
50extern const uint8_t h263_mbtype_b_tab[15][2];
51
52extern VLC ff_h263_intra_MCBPC_vlc;
53extern VLC ff_h263_inter_MCBPC_vlc;
54extern VLC ff_h263_cbpy_vlc;
55
56extern RLTable ff_h263_rl_inter;
57
58extern RLTable rl_intra_aic;
59
60extern const uint16_t h263_format[8][2];
61extern const uint8_t modified_quant_tab[2][32];
62extern uint16_t ff_mba_max[6];
63extern uint8_t ff_mba_length[7];
64
65extern uint8_t ff_h263_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
66
67
68int h263_decode_motion(MpegEncContext * s, int pred, int f_code);
69av_const int ff_h263_aspect_to_info(AVRational aspect);
70int ff_h263_decode_init(AVCodecContext *avctx);
71int ff_h263_decode_frame(AVCodecContext *avctx,
72                             void *data, int *data_size,
73                             AVPacket *avpkt);
74int ff_h263_decode_end(AVCodecContext *avctx);
75void h263_encode_mb(MpegEncContext *s,
76                    DCTELEM block[6][64],
77                    int motion_x, int motion_y);
78void h263_encode_picture_header(MpegEncContext *s, int picture_number);
79void h263_encode_gob_header(MpegEncContext * s, int mb_line);
80int16_t *h263_pred_motion(MpegEncContext * s, int block, int dir,
81                        int *px, int *py);
82void h263_encode_init(MpegEncContext *s);
83void h263_decode_init_vlc(MpegEncContext *s);
84int h263_decode_picture_header(MpegEncContext *s);
85int ff_h263_decode_gob_header(MpegEncContext *s);
86void ff_h263_update_motion_val(MpegEncContext * s);
87void ff_h263_loop_filter(MpegEncContext * s);
88int ff_h263_decode_mba(MpegEncContext *s);
89void ff_h263_encode_mba(MpegEncContext *s);
90void ff_init_qscale_tab(MpegEncContext *s);
91int h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr);
92void h263_pred_acdc(MpegEncContext * s, DCTELEM *block, int n);
93
94
95/**
96 * Prints picture info if FF_DEBUG_PICT_INFO is set.
97 */
98void ff_h263_show_pict_info(MpegEncContext *s);
99
100int ff_intel_h263_decode_picture_header(MpegEncContext *s);
101int ff_h263_decode_mb(MpegEncContext *s,
102                      DCTELEM block[6][64]);
103
104/**
105 * Returns the value of the 3bit "source format" syntax element.
106 * that represents some standard picture dimensions or indicates that
107 * width&height are explicitly stored later.
108 */
109int av_const h263_get_picture_format(int width, int height);
110
111void ff_clean_h263_qscales(MpegEncContext *s);
112int ff_h263_resync(MpegEncContext *s);
113const uint8_t *ff_h263_find_resync_marker(const uint8_t *p, const uint8_t *end);
114int ff_h263_get_gob_height(MpegEncContext *s);
115void ff_h263_encode_motion(MpegEncContext * s, int val, int f_code);
116
117
118static inline int h263_get_motion_length(MpegEncContext * s, int val, int f_code){
119    int l, bit_size, code;
120
121    if (val == 0) {
122        return mvtab[0][1];
123    } else {
124        bit_size = f_code - 1;
125        /* modulo encoding */
126        l= INT_BIT - 6 - bit_size;
127        val = (val<<l)>>l;
128        val--;
129        code = (val >> bit_size) + 1;
130
131        return mvtab[code][1] + 1 + bit_size;
132    }
133}
134
135static inline void ff_h263_encode_motion_vector(MpegEncContext * s, int x, int y, int f_code){
136    if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
137        skip_put_bits(&s->pb,
138            h263_get_motion_length(s, x, f_code)
139           +h263_get_motion_length(s, y, f_code));
140    }else{
141        ff_h263_encode_motion(s, x, f_code);
142        ff_h263_encode_motion(s, y, f_code);
143    }
144}
145
146static inline int get_p_cbp(MpegEncContext * s,
147                      DCTELEM block[6][64],
148                      int motion_x, int motion_y){
149    int cbp, i;
150
151    if(s->flags & CODEC_FLAG_CBP_RD){
152        int best_cbpy_score= INT_MAX;
153        int best_cbpc_score= INT_MAX;
154        int cbpc = (-1), cbpy= (-1);
155        const int offset= (s->mv_type==MV_TYPE_16X16 ? 0 : 16) + (s->dquant ? 8 : 0);
156        const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
157
158        for(i=0; i<4; i++){
159            int score= ff_h263_inter_MCBPC_bits[i + offset] * lambda;
160            if(i&1) score += s->coded_score[5];
161            if(i&2) score += s->coded_score[4];
162
163            if(score < best_cbpc_score){
164                best_cbpc_score= score;
165                cbpc= i;
166            }
167        }
168
169        for(i=0; i<16; i++){
170            int score= ff_h263_cbpy_tab[i ^ 0xF][1] * lambda;
171            if(i&1) score += s->coded_score[3];
172            if(i&2) score += s->coded_score[2];
173            if(i&4) score += s->coded_score[1];
174            if(i&8) score += s->coded_score[0];
175
176            if(score < best_cbpy_score){
177                best_cbpy_score= score;
178                cbpy= i;
179            }
180        }
181        cbp= cbpc + 4*cbpy;
182        if ((motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16){
183            if(best_cbpy_score + best_cbpc_score + 2*lambda >= 0)
184                cbp= 0;
185        }
186
187        for (i = 0; i < 6; i++) {
188            if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){
189                s->block_last_index[i]= -1;
190                s->dsp.clear_block(s->block[i]);
191            }
192        }
193    }else{
194        cbp= 0;
195        for (i = 0; i < 6; i++) {
196            if (s->block_last_index[i] >= 0)
197                cbp |= 1 << (5 - i);
198        }
199    }
200    return cbp;
201}
202
203static inline int get_b_cbp(MpegEncContext * s, DCTELEM block[6][64],
204                            int motion_x, int motion_y, int mb_type){
205    int cbp=0, i;
206
207    if(s->flags & CODEC_FLAG_CBP_RD){
208        int score=0;
209        const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
210
211        for(i=0; i<6; i++){
212            if(s->coded_score[i] < 0){
213                score += s->coded_score[i];
214                cbp |= 1 << (5 - i);
215            }
216        }
217
218        if(cbp){
219            int zero_score= -6;
220            if ((motion_x | motion_y | s->dquant | mb_type) == 0){
221                zero_score-= 4; //2*MV + mb_type + cbp bit
222            }
223
224            zero_score*= lambda;
225            if(zero_score <= score){
226                cbp=0;
227            }
228        }
229
230        for (i = 0; i < 6; i++) {
231            if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){
232                s->block_last_index[i]= -1;
233                s->dsp.clear_block(s->block[i]);
234            }
235        }
236    }else{
237        for (i = 0; i < 6; i++) {
238            if (s->block_last_index[i] >= 0)
239                cbp |= 1 << (5 - i);
240        }
241    }
242    return cbp;
243}
244
245static inline void memsetw(short *tab, int val, int n)
246{
247    int i;
248    for(i=0;i<n;i++)
249        tab[i] = val;
250}
251#endif
252