Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / mpeg4video.c
CommitLineData
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
28uint8_t ff_mpeg4_static_rl_table_store[3][2][2 * MAX_RUN + MAX_LEVEL + 3];
29
30int 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
45void 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
81void 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
91static 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 */
127int 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}