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1 /*
2  * H.263/MPEG-4 backend for encoder and decoder
3  * Copyright (c) 2000,2001 Fabrice Bellard
4  * H.263+ support.
5  * Copyright (c) 2001 Juan J. Sierralta P
6  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
7  *
8  * This file is part of FFmpeg.
9  *
10  * FFmpeg is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU Lesser General Public
12  * License as published by the Free Software Foundation; either
13  * version 2.1 of the License, or (at your option) any later version.
14  *
15  * FFmpeg is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18  * Lesser General Public License for more details.
19  *
20  * You should have received a copy of the GNU Lesser General Public
21  * License along with FFmpeg; if not, write to the Free Software
22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23  */
24 
25 /**
26  * @file
27  * H.263/MPEG-4 codec.
28  */
29 
30 #include "libavutil/thread.h"
31 #include "mpegvideo.h"
32 #include "h263.h"
33 #include "h263data.h"
34 #include "h263dsp.h"
35 #include "idctdsp.h"
36 #include "mathops.h"
37 #include "mpegpicture.h"
38 #include "mpegutils.h"
39 #include "rl.h"
40 
h263_init_rl_inter(void)41 static av_cold void h263_init_rl_inter(void)
42 {
43     static uint8_t h263_rl_inter_table[2][2 * MAX_RUN + MAX_LEVEL + 3];
44     ff_rl_init(&ff_h263_rl_inter, h263_rl_inter_table);
45 }
46 
ff_h263_init_rl_inter(void)47 av_cold void ff_h263_init_rl_inter(void)
48 {
49     static AVOnce init_static_once = AV_ONCE_INIT;
50     ff_thread_once(&init_static_once, h263_init_rl_inter);
51 }
52 
ff_h263_update_motion_val(MpegEncContext * s)53 void ff_h263_update_motion_val(MpegEncContext * s){
54     const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
55                //FIXME a lot of that is only needed for !low_delay
56     const int wrap = s->b8_stride;
57     const int xy = s->block_index[0];
58 
59     s->current_picture.mbskip_table[mb_xy] = s->mb_skipped;
60 
61     if(s->mv_type != MV_TYPE_8X8){
62         int motion_x, motion_y;
63         if (s->mb_intra) {
64             motion_x = 0;
65             motion_y = 0;
66         } else if (s->mv_type == MV_TYPE_16X16) {
67             motion_x = s->mv[0][0][0];
68             motion_y = s->mv[0][0][1];
69         } else /*if (s->mv_type == MV_TYPE_FIELD)*/ {
70             int i;
71             motion_x = s->mv[0][0][0] + s->mv[0][1][0];
72             motion_y = s->mv[0][0][1] + s->mv[0][1][1];
73             motion_x = (motion_x>>1) | (motion_x&1);
74             for(i=0; i<2; i++){
75                 s->p_field_mv_table[i][0][mb_xy][0]= s->mv[0][i][0];
76                 s->p_field_mv_table[i][0][mb_xy][1]= s->mv[0][i][1];
77             }
78             s->current_picture.ref_index[0][4*mb_xy    ] =
79             s->current_picture.ref_index[0][4*mb_xy + 1] = s->field_select[0][0];
80             s->current_picture.ref_index[0][4*mb_xy + 2] =
81             s->current_picture.ref_index[0][4*mb_xy + 3] = s->field_select[0][1];
82         }
83 
84         /* no update if 8X8 because it has been done during parsing */
85         s->current_picture.motion_val[0][xy][0]            = motion_x;
86         s->current_picture.motion_val[0][xy][1]            = motion_y;
87         s->current_picture.motion_val[0][xy + 1][0]        = motion_x;
88         s->current_picture.motion_val[0][xy + 1][1]        = motion_y;
89         s->current_picture.motion_val[0][xy + wrap][0]     = motion_x;
90         s->current_picture.motion_val[0][xy + wrap][1]     = motion_y;
91         s->current_picture.motion_val[0][xy + 1 + wrap][0] = motion_x;
92         s->current_picture.motion_val[0][xy + 1 + wrap][1] = motion_y;
93     }
94 
95     if(s->encoding){ //FIXME encoding MUST be cleaned up
96         if (s->mv_type == MV_TYPE_8X8)
97             s->current_picture.mb_type[mb_xy] = MB_TYPE_L0 | MB_TYPE_8x8;
98         else if(s->mb_intra)
99             s->current_picture.mb_type[mb_xy] = MB_TYPE_INTRA;
100         else
101             s->current_picture.mb_type[mb_xy] = MB_TYPE_L0 | MB_TYPE_16x16;
102     }
103 }
104 
ff_h263_loop_filter(MpegEncContext * s)105 void ff_h263_loop_filter(MpegEncContext * s){
106     int qp_c;
107     const int linesize  = s->linesize;
108     const int uvlinesize= s->uvlinesize;
109     const int xy = s->mb_y * s->mb_stride + s->mb_x;
110     uint8_t *dest_y = s->dest[0];
111     uint8_t *dest_cb= s->dest[1];
112     uint8_t *dest_cr= s->dest[2];
113 
114     /*
115        Diag Top
116        Left Center
117     */
118     if (!IS_SKIP(s->current_picture.mb_type[xy])) {
119         qp_c= s->qscale;
120         s->h263dsp.h263_v_loop_filter(dest_y + 8 * linesize,     linesize, qp_c);
121         s->h263dsp.h263_v_loop_filter(dest_y + 8 * linesize + 8, linesize, qp_c);
122     }else
123         qp_c= 0;
124 
125     if(s->mb_y){
126         int qp_dt, qp_tt, qp_tc;
127 
128         if (IS_SKIP(s->current_picture.mb_type[xy - s->mb_stride]))
129             qp_tt=0;
130         else
131             qp_tt = s->current_picture.qscale_table[xy - s->mb_stride];
132 
133         if(qp_c)
134             qp_tc= qp_c;
135         else
136             qp_tc= qp_tt;
137 
138         if(qp_tc){
139             const int chroma_qp= s->chroma_qscale_table[qp_tc];
140             s->h263dsp.h263_v_loop_filter(dest_y,     linesize, qp_tc);
141             s->h263dsp.h263_v_loop_filter(dest_y + 8, linesize, qp_tc);
142 
143             s->h263dsp.h263_v_loop_filter(dest_cb, uvlinesize, chroma_qp);
144             s->h263dsp.h263_v_loop_filter(dest_cr, uvlinesize, chroma_qp);
145         }
146 
147         if(qp_tt)
148             s->h263dsp.h263_h_loop_filter(dest_y - 8 * linesize + 8, linesize, qp_tt);
149 
150         if(s->mb_x){
151             if (qp_tt || IS_SKIP(s->current_picture.mb_type[xy - 1 - s->mb_stride]))
152                 qp_dt= qp_tt;
153             else
154                 qp_dt = s->current_picture.qscale_table[xy - 1 - s->mb_stride];
155 
156             if(qp_dt){
157                 const int chroma_qp= s->chroma_qscale_table[qp_dt];
158                 s->h263dsp.h263_h_loop_filter(dest_y  - 8 * linesize,   linesize,   qp_dt);
159                 s->h263dsp.h263_h_loop_filter(dest_cb - 8 * uvlinesize, uvlinesize, chroma_qp);
160                 s->h263dsp.h263_h_loop_filter(dest_cr - 8 * uvlinesize, uvlinesize, chroma_qp);
161             }
162         }
163     }
164 
165     if(qp_c){
166         s->h263dsp.h263_h_loop_filter(dest_y + 8, linesize, qp_c);
167         if(s->mb_y + 1 == s->mb_height)
168             s->h263dsp.h263_h_loop_filter(dest_y + 8 * linesize + 8, linesize, qp_c);
169     }
170 
171     if(s->mb_x){
172         int qp_lc;
173         if (qp_c || IS_SKIP(s->current_picture.mb_type[xy - 1]))
174             qp_lc= qp_c;
175         else
176             qp_lc = s->current_picture.qscale_table[xy - 1];
177 
178         if(qp_lc){
179             s->h263dsp.h263_h_loop_filter(dest_y, linesize, qp_lc);
180             if(s->mb_y + 1 == s->mb_height){
181                 const int chroma_qp= s->chroma_qscale_table[qp_lc];
182                 s->h263dsp.h263_h_loop_filter(dest_y + 8 * linesize, linesize, qp_lc);
183                 s->h263dsp.h263_h_loop_filter(dest_cb, uvlinesize, chroma_qp);
184                 s->h263dsp.h263_h_loop_filter(dest_cr, uvlinesize, chroma_qp);
185             }
186         }
187     }
188 }
189 
ff_h263_pred_motion(MpegEncContext * s,int block,int dir,int * px,int * py)190 int16_t *ff_h263_pred_motion(MpegEncContext * s, int block, int dir,
191                              int *px, int *py)
192 {
193     int wrap;
194     int16_t *A, *B, *C, (*mot_val)[2];
195     static const int off[4]= {2, 1, 1, -1};
196 
197     wrap = s->b8_stride;
198     mot_val = s->current_picture.motion_val[dir] + s->block_index[block];
199 
200     A = mot_val[ - 1];
201     /* special case for first (slice) line */
202     if (s->first_slice_line && block<3) {
203         // we can't just change some MVs to simulate that as we need them for the B-frames (and ME)
204         // and if we ever support non rectangular objects than we need to do a few ifs here anyway :(
205         if(block==0){ //most common case
206             if(s->mb_x  == s->resync_mb_x){ //rare
207                 *px= *py = 0;
208             }else if(s->mb_x + 1 == s->resync_mb_x && s->h263_pred){ //rare
209                 C = mot_val[off[block] - wrap];
210                 if(s->mb_x==0){
211                     *px = C[0];
212                     *py = C[1];
213                 }else{
214                     *px = mid_pred(A[0], 0, C[0]);
215                     *py = mid_pred(A[1], 0, C[1]);
216                 }
217             }else{
218                 *px = A[0];
219                 *py = A[1];
220             }
221         }else if(block==1){
222             if(s->mb_x + 1 == s->resync_mb_x && s->h263_pred){ //rare
223                 C = mot_val[off[block] - wrap];
224                 *px = mid_pred(A[0], 0, C[0]);
225                 *py = mid_pred(A[1], 0, C[1]);
226             }else{
227                 *px = A[0];
228                 *py = A[1];
229             }
230         }else{ /* block==2*/
231             B = mot_val[ - wrap];
232             C = mot_val[off[block] - wrap];
233             if(s->mb_x == s->resync_mb_x) //rare
234                 A[0]=A[1]=0;
235 
236             *px = mid_pred(A[0], B[0], C[0]);
237             *py = mid_pred(A[1], B[1], C[1]);
238         }
239     } else {
240         B = mot_val[ - wrap];
241         C = mot_val[off[block] - wrap];
242         *px = mid_pred(A[0], B[0], C[0]);
243         *py = mid_pred(A[1], B[1], C[1]);
244     }
245     return *mot_val;
246 }
247