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2ba45a60 DM |
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 FFmpeg. | |
7 | * | |
8 | * FFmpeg 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 | * FFmpeg 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 FFmpeg; 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 | } |