mpegvideo: move mpegvideo formats-related defines to mpegutils.h
[ffmpeg.git] / libavcodec / mpeg4video.c
1 /*
2  * MPEG4 decoder / encoder common code.
3  * Copyright (c) 2000,2001 Fabrice Bellard
4  * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of Libav.
7  *
8  * Libav is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * Libav is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with Libav; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22
23 #include "mpegutils.h"
24 #include "mpegvideo.h"
25 #include "mpeg4video.h"
26 #include "mpeg4data.h"
27
28 uint8_t ff_mpeg4_static_rl_table_store[3][2][2 * MAX_RUN + MAX_LEVEL + 3];
29
30 int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s)
31 {
32     switch (s->pict_type) {
33     case AV_PICTURE_TYPE_I:
34         return 16;
35     case AV_PICTURE_TYPE_P:
36     case AV_PICTURE_TYPE_S:
37         return s->f_code + 15;
38     case AV_PICTURE_TYPE_B:
39         return FFMAX3(s->f_code, s->b_code, 2) + 15;
40     default:
41         return -1;
42     }
43 }
44
45 void ff_mpeg4_clean_buffers(MpegEncContext *s)
46 {
47     int c_wrap, c_xy, l_wrap, l_xy;
48
49     l_wrap = s->b8_stride;
50     l_xy   = (2 * s->mb_y - 1) * l_wrap + s->mb_x * 2 - 1;
51     c_wrap = s->mb_stride;
52     c_xy   = (s->mb_y - 1) * c_wrap + s->mb_x - 1;
53
54 #if 0
55     /* clean DC */
56     memsetw(s->dc_val[0] + l_xy, 1024, l_wrap * 2 + 1);
57     memsetw(s->dc_val[1] + c_xy, 1024, c_wrap + 1);
58     memsetw(s->dc_val[2] + c_xy, 1024, c_wrap + 1);
59 #endif
60
61     /* clean AC */
62     memset(s->ac_val[0] + l_xy, 0, (l_wrap * 2 + 1) * 16 * sizeof(int16_t));
63     memset(s->ac_val[1] + c_xy, 0, (c_wrap     + 1) * 16 * sizeof(int16_t));
64     memset(s->ac_val[2] + c_xy, 0, (c_wrap     + 1) * 16 * sizeof(int16_t));
65
66     /* clean MV */
67     // we can't clear the MVs as they might be needed by a b frame
68 //    memset(s->motion_val + l_xy, 0, (l_wrap * 2 + 1) * 2 * sizeof(int16_t));
69 //    memset(s->motion_val, 0, 2 * sizeof(int16_t) * (2 + s->mb_width * 2) *
70 //           (2 + s->mb_height * 2));
71     s->last_mv[0][0][0] =
72     s->last_mv[0][0][1] =
73     s->last_mv[1][0][0] =
74     s->last_mv[1][0][1] = 0;
75 }
76
77 #define tab_size ((signed)FF_ARRAY_ELEMS(s->direct_scale_mv[0]))
78 #define tab_bias (tab_size / 2)
79
80 // used by mpeg4 and rv10 decoder
81 void ff_mpeg4_init_direct_mv(MpegEncContext *s)
82 {
83     int i;
84     for (i = 0; i < tab_size; i++) {
85         s->direct_scale_mv[0][i] = (i - tab_bias) * s->pb_time / s->pp_time;
86         s->direct_scale_mv[1][i] = (i - tab_bias) * (s->pb_time - s->pp_time) /
87                                    s->pp_time;
88     }
89 }
90
91 static inline void ff_mpeg4_set_one_direct_mv(MpegEncContext *s, int mx,
92                                               int my, int i)
93 {
94     int xy           = s->block_index[i];
95     uint16_t time_pp = s->pp_time;
96     uint16_t time_pb = s->pb_time;
97     int p_mx, p_my;
98
99     p_mx = s->next_picture.motion_val[0][xy][0];
100     if ((unsigned)(p_mx + tab_bias) < tab_size) {
101         s->mv[0][i][0] = s->direct_scale_mv[0][p_mx + tab_bias] + mx;
102         s->mv[1][i][0] = mx ? s->mv[0][i][0] - p_mx
103                             : s->direct_scale_mv[1][p_mx + tab_bias];
104     } else {
105         s->mv[0][i][0] = p_mx * time_pb / time_pp + mx;
106         s->mv[1][i][0] = mx ? s->mv[0][i][0] - p_mx
107                             : p_mx * (time_pb - time_pp) / time_pp;
108     }
109     p_my = s->next_picture.motion_val[0][xy][1];
110     if ((unsigned)(p_my + tab_bias) < tab_size) {
111         s->mv[0][i][1] = s->direct_scale_mv[0][p_my + tab_bias] + my;
112         s->mv[1][i][1] = my ? s->mv[0][i][1] - p_my
113                             : s->direct_scale_mv[1][p_my + tab_bias];
114     } else {
115         s->mv[0][i][1] = p_my * time_pb / time_pp + my;
116         s->mv[1][i][1] = my ? s->mv[0][i][1] - p_my
117                             : p_my * (time_pb - time_pp) / time_pp;
118     }
119 }
120
121 #undef tab_size
122 #undef tab_bias
123
124 /**
125  * @return the mb_type
126  */
127 int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my)
128 {
129     const int mb_index          = s->mb_x + s->mb_y * s->mb_stride;
130     const int colocated_mb_type = s->next_picture.mb_type[mb_index];
131     uint16_t time_pp;
132     uint16_t time_pb;
133     int i;
134
135     // FIXME avoid divides
136     // try special case with shifts for 1 and 3 B-frames?
137
138     if (IS_8X8(colocated_mb_type)) {
139         s->mv_type = MV_TYPE_8X8;
140         for (i = 0; i < 4; i++)
141             ff_mpeg4_set_one_direct_mv(s, mx, my, i);
142         return MB_TYPE_DIRECT2 | MB_TYPE_8x8 | MB_TYPE_L0L1;
143     } else if (IS_INTERLACED(colocated_mb_type)) {
144         s->mv_type = MV_TYPE_FIELD;
145         for (i = 0; i < 2; i++) {
146             int field_select = s->next_picture.ref_index[0][4 * mb_index + 2 * i];
147             s->field_select[0][i] = field_select;
148             s->field_select[1][i] = i;
149             if (s->top_field_first) {
150                 time_pp = s->pp_field_time - field_select + i;
151                 time_pb = s->pb_field_time - field_select + i;
152             } else {
153                 time_pp = s->pp_field_time + field_select - i;
154                 time_pb = s->pb_field_time + field_select - i;
155             }
156             s->mv[0][i][0] = s->p_field_mv_table[i][0][mb_index][0] *
157                              time_pb / time_pp + mx;
158             s->mv[0][i][1] = s->p_field_mv_table[i][0][mb_index][1] *
159                              time_pb / time_pp + my;
160             s->mv[1][i][0] = mx ? s->mv[0][i][0] -
161                                   s->p_field_mv_table[i][0][mb_index][0]
162                                 : s->p_field_mv_table[i][0][mb_index][0] *
163                                   (time_pb - time_pp) / time_pp;
164             s->mv[1][i][1] = my ? s->mv[0][i][1] -
165                                   s->p_field_mv_table[i][0][mb_index][1]
166                                 : s->p_field_mv_table[i][0][mb_index][1] *
167                                   (time_pb - time_pp) / time_pp;
168         }
169         return MB_TYPE_DIRECT2 | MB_TYPE_16x8 |
170                MB_TYPE_L0L1    | MB_TYPE_INTERLACED;
171     } else {
172         ff_mpeg4_set_one_direct_mv(s, mx, my, 0);
173         s->mv[0][1][0] =
174         s->mv[0][2][0] =
175         s->mv[0][3][0] = s->mv[0][0][0];
176         s->mv[0][1][1] =
177         s->mv[0][2][1] =
178         s->mv[0][3][1] = s->mv[0][0][1];
179         s->mv[1][1][0] =
180         s->mv[1][2][0] =
181         s->mv[1][3][0] = s->mv[1][0][0];
182         s->mv[1][1][1] =
183         s->mv[1][2][1] =
184         s->mv[1][3][1] = s->mv[1][0][1];
185         if ((s->avctx->workaround_bugs & FF_BUG_DIRECT_BLOCKSIZE) ||
186             !s->quarter_sample)
187             s->mv_type = MV_TYPE_16X16;
188         else
189             s->mv_type = MV_TYPE_8X8;
190         // Note see prev line
191         return MB_TYPE_DIRECT2 | MB_TYPE_16x16 | MB_TYPE_L0L1;
192     }
193 }