FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/mpeg4video.c
Date: 2026-09-26 20:14:34
Exec Total Coverage
Lines: 78 103 75.7%
Functions: 5 5 100.0%
Branches: 25 36 69.4%
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1 /*
2 * MPEG-4 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 11420 int ff_mpeg4_get_video_packet_prefix_length(enum AVPictureType pict_type,
29 int f_code, int b_code)
30 {
31
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 11420 switch (pict_type) {
32 1473 case AV_PICTURE_TYPE_I:
33 1473 return 16;
34 3842 case AV_PICTURE_TYPE_P:
35 case AV_PICTURE_TYPE_S:
36 3842 return f_code + 15;
37 6105 case AV_PICTURE_TYPE_B:
38 6105 return FFMAX3(f_code, b_code, 2) + 15;
39 ✗ default:
40 ✗ return -1;
41 }
42 }
43
44 7736 void ff_mpeg4_clean_buffers(MpegEncContext *s)
45 {
46 7736 const int mb_height = s->mb_height;
47 int c_wrap, l_wrap, l_xy;
48
49 7736 l_wrap = s->b8_stride;
50 7736 l_xy = (2 * s->mb_y - 1) * l_wrap + s->mb_x * 2 - 1;
51 7736 c_wrap = s->mb_stride;
52 7736 int u_xy = 2 * mb_height * l_wrap + s->mb_y * c_wrap + s->mb_x - 1;
53 7736 int v_xy = u_xy + c_wrap * (mb_height + 1);
54 7736 int16_t (*ac_val)[16] = s->ac_val;
55
56 /* clean AC */
57 7736 memset(ac_val + l_xy, 0, (l_wrap * 2 + 1) * sizeof(*ac_val));
58 7736 memset(ac_val + u_xy, 0, (c_wrap + 1) * sizeof(*ac_val));
59 7736 memset(ac_val + v_xy, 0, (c_wrap + 1) * sizeof(*ac_val));
60
61 /* clean MV */
62 // we can't clear the MVs as they might be needed by a B-frame
63 7736 s->last_mv[0][0][0] =
64 7736 s->last_mv[0][0][1] =
65 7736 s->last_mv[1][0][0] =
66 7736 s->last_mv[1][0][1] = 0;
67 7736 }
68
69 #define tab_size ((signed)FF_ARRAY_ELEMS(s->direct_scale_mv[0]))
70 #define tab_bias (tab_size / 2)
71
72 // used by MPEG-4 and rv10 decoder
73 2084 void ff_mpeg4_init_direct_mv(MpegEncContext *s)
74 {
75 int i;
76
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 135460 for (i = 0; i < tab_size; i++) {
77 133376 s->direct_scale_mv[0][i] = (i - tab_bias) * s->pb_time / s->pp_time;
78 133376 s->direct_scale_mv[1][i] = (i - tab_bias) * (s->pb_time - s->pp_time) /
79 133376 s->pp_time;
80 }
81 2084 }
82
83 562578 static inline void ff_mpeg4_set_one_direct_mv(MpegEncContext *s, int mx,
84 int my, int i)
85 {
86 562578 int xy = s->block_index[i];
87 562578 uint16_t time_pp = s->pp_time;
88 562578 uint16_t time_pb = s->pb_time;
89 int p_mx, p_my;
90
91 562578 p_mx = s->next_pic.motion_val[0][xy][0];
92
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 562578 if ((unsigned)(p_mx + tab_bias) < tab_size) {
93 544190 s->mv[0][i][0] = s->direct_scale_mv[0][p_mx + tab_bias] + mx;
94 544190 s->mv[1][i][0] = mx ? s->mv[0][i][0] - p_mx
95
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 544190 : s->direct_scale_mv[1][p_mx + tab_bias];
96 } else {
97 18388 s->mv[0][i][0] = p_mx * time_pb / time_pp + mx;
98 18388 s->mv[1][i][0] = mx ? s->mv[0][i][0] - p_mx
99
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 18388 : p_mx * (time_pb - time_pp) / time_pp;
100 }
101 562578 p_my = s->next_pic.motion_val[0][xy][1];
102
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 562578 if ((unsigned)(p_my + tab_bias) < tab_size) {
103 543001 s->mv[0][i][1] = s->direct_scale_mv[0][p_my + tab_bias] + my;
104 543001 s->mv[1][i][1] = my ? s->mv[0][i][1] - p_my
105
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 543001 : s->direct_scale_mv[1][p_my + tab_bias];
106 } else {
107 19577 s->mv[0][i][1] = p_my * time_pb / time_pp + my;
108 19577 s->mv[1][i][1] = my ? s->mv[0][i][1] - p_my
109
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 19577 : p_my * (time_pb - time_pp) / time_pp;
110 }
111 562578 }
112
113 #undef tab_size
114 #undef tab_bias
115
116 /**
117 * @return the mb_type
118 */
119 288015 int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my)
120 {
121 288015 const int mb_index = s->mb_x + s->mb_y * s->mb_stride;
122 288015 const int colocated_mb_type = s->next_pic.mb_type[mb_index];
123 uint16_t time_pp;
124 uint16_t time_pb;
125 int i;
126
127 // FIXME avoid divides
128 // try special case with shifts for 1 and 3 B-frames?
129
130
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 288015 if (IS_8X8(colocated_mb_type)) {
131 91521 s->mv_type = MV_TYPE_8X8;
132
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 457605 for (i = 0; i < 4; i++)
133 366084 ff_mpeg4_set_one_direct_mv(s, mx, my, i);
134 91521 return MB_TYPE_DIRECT2 | MB_TYPE_8x8 | MB_TYPE_BIDIR_MV;
135
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 196494 } else if (IS_INTERLACED(colocated_mb_type)) {
136 ✗ s->mv_type = MV_TYPE_FIELD;
137 ✗ for (i = 0; i < 2; i++) {
138 ✗ int field_select = s->next_pic.ref_index[0][4 * mb_index + 2 * i];
139 ✗ s->field_select[0][i] = field_select;
140 ✗ s->field_select[1][i] = i;
141 ✗ if (s->top_field_first) {
142 ✗ time_pp = s->pp_field_time - field_select + i;
143 ✗ time_pb = s->pb_field_time - field_select + i;
144 } else {
145 ✗ time_pp = s->pp_field_time + field_select - i;
146 ✗ time_pb = s->pb_field_time + field_select - i;
147 }
148 ✗ s->mv[0][i][0] = s->p_field_mv_table[i][0][mb_index][0] *
149 ✗ time_pb / time_pp + mx;
150 ✗ s->mv[0][i][1] = s->p_field_mv_table[i][0][mb_index][1] *
151 ✗ time_pb / time_pp + my;
152 ✗ s->mv[1][i][0] = mx ? s->mv[0][i][0] -
153 ✗ s->p_field_mv_table[i][0][mb_index][0]
154 ✗ : s->p_field_mv_table[i][0][mb_index][0] *
155 ✗ (time_pb - time_pp) / time_pp;
156 ✗ s->mv[1][i][1] = my ? s->mv[0][i][1] -
157 ✗ s->p_field_mv_table[i][0][mb_index][1]
158 ✗ : s->p_field_mv_table[i][0][mb_index][1] *
159 ✗ (time_pb - time_pp) / time_pp;
160 }
161 ✗ return MB_TYPE_DIRECT2 | MB_TYPE_16x8 |
162 MB_TYPE_BIDIR_MV | MB_TYPE_INTERLACED;
163 } else {
164 196494 ff_mpeg4_set_one_direct_mv(s, mx, my, 0);
165 196494 s->mv[0][1][0] =
166 196494 s->mv[0][2][0] =
167 196494 s->mv[0][3][0] = s->mv[0][0][0];
168 196494 s->mv[0][1][1] =
169 196494 s->mv[0][2][1] =
170 196494 s->mv[0][3][1] = s->mv[0][0][1];
171 196494 s->mv[1][1][0] =
172 196494 s->mv[1][2][0] =
173 196494 s->mv[1][3][0] = s->mv[1][0][0];
174 196494 s->mv[1][1][1] =
175 196494 s->mv[1][2][1] =
176 196494 s->mv[1][3][1] = s->mv[1][0][1];
177
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 196494 if ((s->avctx->workaround_bugs & FF_BUG_DIRECT_BLOCKSIZE) ||
178
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 196494 !s->quarter_sample)
179 167336 s->mv_type = MV_TYPE_16X16;
180 else
181 29158 s->mv_type = MV_TYPE_8X8;
182 // Note see prev line
183 196494 return MB_TYPE_DIRECT2 | MB_TYPE_16x16 | MB_TYPE_BIDIR_MV;
184 }
185 }
186