FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/mpeg4video.c
Date: 2025-06-01 09:29:47
Exec Total Coverage
Lines: 75 100 75.0%
Functions: 5 5 100.0%
Branches: 25 36 69.4%
Line Branch Exec Source
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 11368 int ff_mpeg4_get_video_packet_prefix_length(enum AVPictureType pict_type,
29 int f_code, int b_code)
30 {
31
3/4
✓ Branch 0 taken 1445 times.
✓ Branch 1 taken 3818 times.
✓ Branch 2 taken 6105 times.
✗ Branch 3 not taken.
 11368 switch (pict_type) {
32 1445 case AV_PICTURE_TYPE_I:
33 1445 return 16;
34 3818 case AV_PICTURE_TYPE_P:
35 case AV_PICTURE_TYPE_S:
36 3818 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 7684 void ff_mpeg4_clean_buffers(MpegEncContext *s)
45 {
46 int c_wrap, c_xy, l_wrap, l_xy;
47
48 7684 l_wrap = s->b8_stride;
49 7684 l_xy = (2 * s->mb_y - 1) * l_wrap + s->mb_x * 2 - 1;
50 7684 c_wrap = s->mb_stride;
51 7684 c_xy = (s->mb_y - 1) * c_wrap + s->mb_x - 1;
52
53 /* clean AC */
54 7684 memset(s->ac_val[0] + l_xy, 0, (l_wrap * 2 + 1) * 16 * sizeof(int16_t));
55 7684 memset(s->ac_val[1] + c_xy, 0, (c_wrap + 1) * 16 * sizeof(int16_t));
56 7684 memset(s->ac_val[2] + c_xy, 0, (c_wrap + 1) * 16 * sizeof(int16_t));
57
58 /* clean MV */
59 // we can't clear the MVs as they might be needed by a B-frame
60 7684 s->last_mv[0][0][0] =
61 7684 s->last_mv[0][0][1] =
62 7684 s->last_mv[1][0][0] =
63 7684 s->last_mv[1][0][1] = 0;
64 7684 }
65
66 #define tab_size ((signed)FF_ARRAY_ELEMS(s->direct_scale_mv[0]))
67 #define tab_bias (tab_size / 2)
68
69 // used by MPEG-4 and rv10 decoder
70 2065 void ff_mpeg4_init_direct_mv(MpegEncContext *s)
71 {
72 int i;
73
2/2
✓ Branch 0 taken 132160 times.
✓ Branch 1 taken 2065 times.
 134225 for (i = 0; i < tab_size; i++) {
74 132160 s->direct_scale_mv[0][i] = (i - tab_bias) * s->pb_time / s->pp_time;
75 132160 s->direct_scale_mv[1][i] = (i - tab_bias) * (s->pb_time - s->pp_time) /
76 132160 s->pp_time;
77 }
78 2065 }
79
80 551257 static inline void ff_mpeg4_set_one_direct_mv(MpegEncContext *s, int mx,
81 int my, int i)
82 {
83 551257 int xy = s->block_index[i];
84 551257 uint16_t time_pp = s->pp_time;
85 551257 uint16_t time_pb = s->pb_time;
86 int p_mx, p_my;
87
88 551257 p_mx = s->next_pic.motion_val[0][xy][0];
89
2/2
✓ Branch 0 taken 532915 times.
✓ Branch 1 taken 18342 times.
 551257 if ((unsigned)(p_mx + tab_bias) < tab_size) {
90 532915 s->mv[0][i][0] = s->direct_scale_mv[0][p_mx + tab_bias] + mx;
91 532915 s->mv[1][i][0] = mx ? s->mv[0][i][0] - p_mx
92
2/2
✓ Branch 0 taken 135813 times.
✓ Branch 1 taken 397102 times.
 532915 : s->direct_scale_mv[1][p_mx + tab_bias];
93 } else {
94 18342 s->mv[0][i][0] = p_mx * time_pb / time_pp + mx;
95 18342 s->mv[1][i][0] = mx ? s->mv[0][i][0] - p_mx
96
2/2
✓ Branch 0 taken 11874 times.
✓ Branch 1 taken 6468 times.
 18342 : p_mx * (time_pb - time_pp) / time_pp;
97 }
98 551257 p_my = s->next_pic.motion_val[0][xy][1];
99
2/2
✓ Branch 0 taken 531680 times.
✓ Branch 1 taken 19577 times.
 551257 if ((unsigned)(p_my + tab_bias) < tab_size) {
100 531680 s->mv[0][i][1] = s->direct_scale_mv[0][p_my + tab_bias] + my;
101 531680 s->mv[1][i][1] = my ? s->mv[0][i][1] - p_my
102
2/2
✓ Branch 0 taken 132962 times.
✓ Branch 1 taken 398718 times.
 531680 : s->direct_scale_mv[1][p_my + tab_bias];
103 } else {
104 19577 s->mv[0][i][1] = p_my * time_pb / time_pp + my;
105 19577 s->mv[1][i][1] = my ? s->mv[0][i][1] - p_my
106
2/2
✓ Branch 0 taken 9739 times.
✓ Branch 1 taken 9838 times.
 19577 : p_my * (time_pb - time_pp) / time_pp;
107 }
108 551257 }
109
110 #undef tab_size
111 #undef tab_bias
112
113 /**
114 * @return the mb_type
115 */
116 279436 int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my)
117 {
118 279436 const int mb_index = s->mb_x + s->mb_y * s->mb_stride;
119 279436 const int colocated_mb_type = s->next_pic.mb_type[mb_index];
120 uint16_t time_pp;
121 uint16_t time_pb;
122 int i;
123
124 // FIXME avoid divides
125 // try special case with shifts for 1 and 3 B-frames?
126
127
2/2
✓ Branch 0 taken 90607 times.
✓ Branch 1 taken 188829 times.
 279436 if (IS_8X8(colocated_mb_type)) {
128 90607 s->mv_type = MV_TYPE_8X8;
129
2/2
✓ Branch 0 taken 362428 times.
✓ Branch 1 taken 90607 times.
 453035 for (i = 0; i < 4; i++)
130 362428 ff_mpeg4_set_one_direct_mv(s, mx, my, i);
131 90607 return MB_TYPE_DIRECT2 | MB_TYPE_8x8 | MB_TYPE_BIDIR_MV;
132
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 188829 times.
 188829 } else if (IS_INTERLACED(colocated_mb_type)) {
133 ✗ s->mv_type = MV_TYPE_FIELD;
134 ✗ for (i = 0; i < 2; i++) {
135 ✗ int field_select = s->next_pic.ref_index[0][4 * mb_index + 2 * i];
136 ✗ s->field_select[0][i] = field_select;
137 ✗ s->field_select[1][i] = i;
138 ✗ if (s->top_field_first) {
139 ✗ time_pp = s->pp_field_time - field_select + i;
140 ✗ time_pb = s->pb_field_time - field_select + i;
141 } else {
142 ✗ time_pp = s->pp_field_time + field_select - i;
143 ✗ time_pb = s->pb_field_time + field_select - i;
144 }
145 ✗ s->mv[0][i][0] = s->p_field_mv_table[i][0][mb_index][0] *
146 ✗ time_pb / time_pp + mx;
147 ✗ s->mv[0][i][1] = s->p_field_mv_table[i][0][mb_index][1] *
148 ✗ time_pb / time_pp + my;
149 ✗ s->mv[1][i][0] = mx ? s->mv[0][i][0] -
150 ✗ s->p_field_mv_table[i][0][mb_index][0]
151 ✗ : s->p_field_mv_table[i][0][mb_index][0] *
152 ✗ (time_pb - time_pp) / time_pp;
153 ✗ s->mv[1][i][1] = my ? s->mv[0][i][1] -
154 ✗ s->p_field_mv_table[i][0][mb_index][1]
155 ✗ : s->p_field_mv_table[i][0][mb_index][1] *
156 ✗ (time_pb - time_pp) / time_pp;
157 }
158 ✗ return MB_TYPE_DIRECT2 | MB_TYPE_16x8 |
159 MB_TYPE_BIDIR_MV | MB_TYPE_INTERLACED;
160 } else {
161 188829 ff_mpeg4_set_one_direct_mv(s, mx, my, 0);
162 188829 s->mv[0][1][0] =
163 188829 s->mv[0][2][0] =
164 188829 s->mv[0][3][0] = s->mv[0][0][0];
165 188829 s->mv[0][1][1] =
166 188829 s->mv[0][2][1] =
167 188829 s->mv[0][3][1] = s->mv[0][0][1];
168 188829 s->mv[1][1][0] =
169 188829 s->mv[1][2][0] =
170 188829 s->mv[1][3][0] = s->mv[1][0][0];
171 188829 s->mv[1][1][1] =
172 188829 s->mv[1][2][1] =
173 188829 s->mv[1][3][1] = s->mv[1][0][1];
174
1/2
✓ Branch 0 taken 188829 times.
✗ Branch 1 not taken.
 188829 if ((s->avctx->workaround_bugs & FF_BUG_DIRECT_BLOCKSIZE) ||
175
2/2
✓ Branch 0 taken 159671 times.
✓ Branch 1 taken 29158 times.
 188829 !s->quarter_sample)
176 159671 s->mv_type = MV_TYPE_16X16;
177 else
178 29158 s->mv_type = MV_TYPE_8X8;
179 // Note see prev line
180 188829 return MB_TYPE_DIRECT2 | MB_TYPE_16x16 | MB_TYPE_BIDIR_MV;
181 }
182 }
183