FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/mpeg4video.c
Date: 2024-07-26 21:54:09
Exec Total Coverage
Lines: 81 106 76.4%
Functions: 7 7 100.0%
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 "libavutil/thread.h"
24
25 #include "mpegutils.h"
26 #include "mpegvideo.h"
27 #include "mpeg4video.h"
28 #include "mpeg4data.h"
29
30 160 static av_cold void mpeg4_init_rl_intra(void)
31 {
32 static uint8_t mpeg4_rl_intra_table[2][2 * MAX_RUN + MAX_LEVEL + 3];
33 160 ff_rl_init(&ff_mpeg4_rl_intra, mpeg4_rl_intra_table);
34 160 }
35
36 160 av_cold void ff_mpeg4_init_rl_intra(void)
37 {
38 static AVOnce init_static_once = AV_ONCE_INIT;
39 160 ff_thread_once(&init_static_once, mpeg4_init_rl_intra);
40 160 }
41
42 11368 int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s)
43 {
44
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 11368 switch (s->pict_type) {
45 1445 case AV_PICTURE_TYPE_I:
46 1445 return 16;
47 3818 case AV_PICTURE_TYPE_P:
48 case AV_PICTURE_TYPE_S:
49 3818 return s->f_code + 15;
50 6105 case AV_PICTURE_TYPE_B:
51 6105 return FFMAX3(s->f_code, s->b_code, 2) + 15;
52 ✗ default:
53 ✗ return -1;
54 }
55 }
56
57 7684 void ff_mpeg4_clean_buffers(MpegEncContext *s)
58 {
59 int c_wrap, c_xy, l_wrap, l_xy;
60
61 7684 l_wrap = s->b8_stride;
62 7684 l_xy = (2 * s->mb_y - 1) * l_wrap + s->mb_x * 2 - 1;
63 7684 c_wrap = s->mb_stride;
64 7684 c_xy = (s->mb_y - 1) * c_wrap + s->mb_x - 1;
65
66 /* clean AC */
67 7684 memset(s->ac_val[0] + l_xy, 0, (l_wrap * 2 + 1) * 16 * sizeof(int16_t));
68 7684 memset(s->ac_val[1] + c_xy, 0, (c_wrap + 1) * 16 * sizeof(int16_t));
69 7684 memset(s->ac_val[2] + c_xy, 0, (c_wrap + 1) * 16 * sizeof(int16_t));
70
71 /* clean MV */
72 // we can't clear the MVs as they might be needed by a B-frame
73 7684 s->last_mv[0][0][0] =
74 7684 s->last_mv[0][0][1] =
75 7684 s->last_mv[1][0][0] =
76 7684 s->last_mv[1][0][1] = 0;
77 7684 }
78
79 #define tab_size ((signed)FF_ARRAY_ELEMS(s->direct_scale_mv[0]))
80 #define tab_bias (tab_size / 2)
81
82 // used by MPEG-4 and rv10 decoder
83 2242 void ff_mpeg4_init_direct_mv(MpegEncContext *s)
84 {
85 int i;
86
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 145730 for (i = 0; i < tab_size; i++) {
87 143488 s->direct_scale_mv[0][i] = (i - tab_bias) * s->pb_time / s->pp_time;
88 143488 s->direct_scale_mv[1][i] = (i - tab_bias) * (s->pb_time - s->pp_time) /
89 143488 s->pp_time;
90 }
91 2242 }
92
93 588166 static inline void ff_mpeg4_set_one_direct_mv(MpegEncContext *s, int mx,
94 int my, int i)
95 {
96 588166 int xy = s->block_index[i];
97 588166 uint16_t time_pp = s->pp_time;
98 588166 uint16_t time_pb = s->pb_time;
99 int p_mx, p_my;
100
101 588166 p_mx = s->next_pic.motion_val[0][xy][0];
102
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 588166 if ((unsigned)(p_mx + tab_bias) < tab_size) {
103 567245 s->mv[0][i][0] = s->direct_scale_mv[0][p_mx + tab_bias] + mx;
104 567245 s->mv[1][i][0] = mx ? s->mv[0][i][0] - p_mx
105
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 567245 : s->direct_scale_mv[1][p_mx + tab_bias];
106 } else {
107 20921 s->mv[0][i][0] = p_mx * time_pb / time_pp + mx;
108 20921 s->mv[1][i][0] = mx ? s->mv[0][i][0] - p_mx
109
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 20921 : p_mx * (time_pb - time_pp) / time_pp;
110 }
111 588166 p_my = s->next_pic.motion_val[0][xy][1];
112
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 588166 if ((unsigned)(p_my + tab_bias) < tab_size) {
113 568006 s->mv[0][i][1] = s->direct_scale_mv[0][p_my + tab_bias] + my;
114 568006 s->mv[1][i][1] = my ? s->mv[0][i][1] - p_my
115
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 568006 : s->direct_scale_mv[1][p_my + tab_bias];
116 } else {
117 20160 s->mv[0][i][1] = p_my * time_pb / time_pp + my;
118 20160 s->mv[1][i][1] = my ? s->mv[0][i][1] - p_my
119
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 20160 : p_my * (time_pb - time_pp) / time_pp;
120 }
121 588166 }
122
123 #undef tab_size
124 #undef tab_bias
125
126 /**
127 * @return the mb_type
128 */
129 303535 int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my)
130 {
131 303535 const int mb_index = s->mb_x + s->mb_y * s->mb_stride;
132 303535 const int colocated_mb_type = s->next_pic.mb_type[mb_index];
133 uint16_t time_pp;
134 uint16_t time_pb;
135 int i;
136
137 // FIXME avoid divides
138 // try special case with shifts for 1 and 3 B-frames?
139
140
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 303535 if (IS_8X8(colocated_mb_type)) {
141 94877 s->mv_type = MV_TYPE_8X8;
142
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 474385 for (i = 0; i < 4; i++)
143 379508 ff_mpeg4_set_one_direct_mv(s, mx, my, i);
144 94877 return MB_TYPE_DIRECT2 | MB_TYPE_8x8 | MB_TYPE_BIDIR_MV;
145
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 208658 } else if (IS_INTERLACED(colocated_mb_type)) {
146 ✗ s->mv_type = MV_TYPE_FIELD;
147 ✗ for (i = 0; i < 2; i++) {
148 ✗ int field_select = s->next_pic.ref_index[0][4 * mb_index + 2 * i];
149 ✗ s->field_select[0][i] = field_select;
150 ✗ s->field_select[1][i] = i;
151 ✗ if (s->top_field_first) {
152 ✗ time_pp = s->pp_field_time - field_select + i;
153 ✗ time_pb = s->pb_field_time - field_select + i;
154 } else {
155 ✗ time_pp = s->pp_field_time + field_select - i;
156 ✗ time_pb = s->pb_field_time + field_select - i;
157 }
158 ✗ s->mv[0][i][0] = s->p_field_mv_table[i][0][mb_index][0] *
159 ✗ time_pb / time_pp + mx;
160 ✗ s->mv[0][i][1] = s->p_field_mv_table[i][0][mb_index][1] *
161 ✗ time_pb / time_pp + my;
162 ✗ s->mv[1][i][0] = mx ? s->mv[0][i][0] -
163 ✗ s->p_field_mv_table[i][0][mb_index][0]
164 ✗ : s->p_field_mv_table[i][0][mb_index][0] *
165 ✗ (time_pb - time_pp) / time_pp;
166 ✗ s->mv[1][i][1] = my ? s->mv[0][i][1] -
167 ✗ s->p_field_mv_table[i][0][mb_index][1]
168 ✗ : s->p_field_mv_table[i][0][mb_index][1] *
169 ✗ (time_pb - time_pp) / time_pp;
170 }
171 ✗ return MB_TYPE_DIRECT2 | MB_TYPE_16x8 |
172 MB_TYPE_BIDIR_MV | MB_TYPE_INTERLACED;
173 } else {
174 208658 ff_mpeg4_set_one_direct_mv(s, mx, my, 0);
175 208658 s->mv[0][1][0] =
176 208658 s->mv[0][2][0] =
177 208658 s->mv[0][3][0] = s->mv[0][0][0];
178 208658 s->mv[0][1][1] =
179 208658 s->mv[0][2][1] =
180 208658 s->mv[0][3][1] = s->mv[0][0][1];
181 208658 s->mv[1][1][0] =
182 208658 s->mv[1][2][0] =
183 208658 s->mv[1][3][0] = s->mv[1][0][0];
184 208658 s->mv[1][1][1] =
185 208658 s->mv[1][2][1] =
186 208658 s->mv[1][3][1] = s->mv[1][0][1];
187
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 208658 if ((s->avctx->workaround_bugs & FF_BUG_DIRECT_BLOCKSIZE) ||
188
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 208658 !s->quarter_sample)
189 179500 s->mv_type = MV_TYPE_16X16;
190 else
191 29158 s->mv_type = MV_TYPE_8X8;
192 // Note see prev line
193 208658 return MB_TYPE_DIRECT2 | MB_TYPE_16x16 | MB_TYPE_BIDIR_MV;
194 }
195 }
196