1 /*
2  * Copyright (c) 2002 The FFmpeg Project
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "avcodec.h"
22 #include "idctdsp.h"
23 #include "mpegvideo.h"
24 #include "msmpeg4data.h"
25 #include "wmv2.h"
26 
27 
ff_wmv2_common_init(MpegEncContext *s)28 av_cold void ff_wmv2_common_init(MpegEncContext *s)
29 {
30     WMV2Context *const w = s->private_ctx;
31 
32     ff_blockdsp_init(&s->bdsp, s->avctx);
33     ff_wmv2dsp_init(&w->wdsp);
34     s->idsp.perm_type = w->wdsp.idct_perm;
35     ff_init_scantable_permutation(s->idsp.idct_permutation,
36                                   w->wdsp.idct_perm);
37     ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable,
38                       ff_wmv1_scantable[1]);
39     ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable,
40                       ff_wmv1_scantable[2]);
41     ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable,
42                       ff_wmv1_scantable[3]);
43     ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable,
44                       ff_wmv1_scantable[0]);
45     s->idsp.idct_put = w->wdsp.idct_put;
46     s->idsp.idct_add = w->wdsp.idct_add;
47     s->idsp.idct     = NULL;
48 }
49 
ff_mspel_motion(MpegEncContext *s, uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr, uint8_t **ref_picture, op_pixels_func (*pix_op)[4], int motion_x, int motion_y, int h)50 void ff_mspel_motion(MpegEncContext *s, uint8_t *dest_y,
51                      uint8_t *dest_cb, uint8_t *dest_cr,
52                      uint8_t **ref_picture, op_pixels_func (*pix_op)[4],
53                      int motion_x, int motion_y, int h)
54 {
55     WMV2Context *const w = s->private_ctx;
56     uint8_t *ptr;
57     int dxy, mx, my, src_x, src_y, v_edge_pos;
58     ptrdiff_t offset, linesize, uvlinesize;
59     int emu = 0;
60 
61     dxy   = ((motion_y & 1) << 1) | (motion_x & 1);
62     dxy   = 2 * dxy + w->hshift;
63     src_x = s->mb_x * 16 + (motion_x >> 1);
64     src_y = s->mb_y * 16 + (motion_y >> 1);
65 
66     /* WARNING: do no forget half pels */
67     v_edge_pos = s->v_edge_pos;
68     src_x      = av_clip(src_x, -16, s->width);
69     src_y      = av_clip(src_y, -16, s->height);
70 
71     if (src_x <= -16 || src_x >= s->width)
72         dxy &= ~3;
73     if (src_y <= -16 || src_y >= s->height)
74         dxy &= ~4;
75 
76     linesize   = s->linesize;
77     uvlinesize = s->uvlinesize;
78     ptr        = ref_picture[0] + (src_y * linesize) + src_x;
79 
80     if (src_x < 1 || src_y < 1 || src_x + 17 >= s->h_edge_pos ||
81         src_y + h + 1 >= v_edge_pos) {
82         s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, ptr - 1 - s->linesize,
83                                  s->linesize, s->linesize, 19, 19,
84                                  src_x - 1, src_y - 1,
85                                  s->h_edge_pos, s->v_edge_pos);
86         ptr = s->sc.edge_emu_buffer + 1 + s->linesize;
87         emu = 1;
88     }
89 
90     w->wdsp.put_mspel_pixels_tab[dxy](dest_y,                    ptr,                    linesize);
91     w->wdsp.put_mspel_pixels_tab[dxy](dest_y     + 8,            ptr     + 8,            linesize);
92     w->wdsp.put_mspel_pixels_tab[dxy](dest_y     + 8 * linesize, ptr     + 8 * linesize, linesize);
93     w->wdsp.put_mspel_pixels_tab[dxy](dest_y + 8 + 8 * linesize, ptr + 8 + 8 * linesize, linesize);
94 
95     if (s->avctx->flags & AV_CODEC_FLAG_GRAY)
96         return;
97 
98     dxy = 0;
99     if ((motion_x & 3) != 0)
100         dxy |= 1;
101     if ((motion_y & 3) != 0)
102         dxy |= 2;
103     mx = motion_x >> 2;
104     my = motion_y >> 2;
105 
106     src_x = s->mb_x * 8 + mx;
107     src_y = s->mb_y * 8 + my;
108     src_x = av_clip(src_x, -8, s->width >> 1);
109     if (src_x == (s->width >> 1))
110         dxy &= ~1;
111     src_y = av_clip(src_y, -8, s->height >> 1);
112     if (src_y == (s->height >> 1))
113         dxy &= ~2;
114     offset = (src_y * uvlinesize) + src_x;
115     ptr    = ref_picture[1] + offset;
116     if (emu) {
117         s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, ptr,
118                                  s->uvlinesize, s->uvlinesize,
119                                  9, 9,
120                                  src_x, src_y,
121                                  s->h_edge_pos >> 1, s->v_edge_pos >> 1);
122         ptr = s->sc.edge_emu_buffer;
123     }
124     pix_op[1][dxy](dest_cb, ptr, uvlinesize, h >> 1);
125 
126     ptr = ref_picture[2] + offset;
127     if (emu) {
128         s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, ptr,
129                                  s->uvlinesize, s->uvlinesize,
130                                  9, 9,
131                                  src_x, src_y,
132                                  s->h_edge_pos >> 1, s->v_edge_pos >> 1);
133         ptr = s->sc.edge_emu_buffer;
134     }
135     pix_op[1][dxy](dest_cr, ptr, uvlinesize, h >> 1);
136 }
137