FFmpeg
wmv2.c
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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 "msmpeg4_vc1_data.h"
25 #include "wmv2.h"
26 
27 
29 {
30  WMV2Context *const w = s->private_ctx;
31 
32  ff_blockdsp_init(&s->bdsp);
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,
39  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable,
41  ff_permute_scantable(s->permutated_intra_h_scantable, ff_wmv1_scantable[2],
42  s->idsp.idct_permutation);
43  ff_permute_scantable(s->permutated_intra_v_scantable, ff_wmv1_scantable[3],
44  s->idsp.idct_permutation);
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 
50 void ff_mspel_motion(MpegEncContext *s, uint8_t *dest_y,
51  uint8_t *dest_cb, uint8_t *dest_cr,
52  uint8_t *const *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  const 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 }
av_clip
#define av_clip
Definition: common.h:95
ff_mspel_motion
void ff_mspel_motion(MpegEncContext *s, uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr, uint8_t *const *ref_picture, op_pixels_func(*pix_op)[4], int motion_x, int motion_y, int h)
Definition: wmv2.c:50
w
uint8_t w
Definition: llviddspenc.c:38
mpegvideo.h
WMV2Context
Definition: wmv2.h:33
ff_permute_scantable
av_cold void ff_permute_scantable(uint8_t dst[64], const uint8_t src[64], const uint8_t permutation[64])
Definition: idctdsp.c:30
av_cold
#define av_cold
Definition: attributes.h:90
ff_blockdsp_init
av_cold void ff_blockdsp_init(BlockDSPContext *c)
Definition: blockdsp.c:58
s
#define s(width, name)
Definition: cbs_vp9.c:256
NULL
#define NULL
Definition: coverity.c:32
ff_wmv2dsp_init
av_cold void ff_wmv2dsp_init(WMV2DSPContext *c)
Definition: wmv2dsp.c:252
op_pixels_func
void(* op_pixels_func)(uint8_t *block, const uint8_t *pixels, ptrdiff_t line_size, int h)
Definition: hpeldsp.h:38
wmv2.h
AV_CODEC_FLAG_GRAY
#define AV_CODEC_FLAG_GRAY
Only decode/encode grayscale.
Definition: avcodec.h:259
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
ff_init_scantable
av_cold void ff_init_scantable(const uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: mpegvideo.c:321
idctdsp.h
avcodec.h
msmpeg4_vc1_data.h
ff_init_scantable_permutation
av_cold void ff_init_scantable_permutation(uint8_t *idct_permutation, enum idct_permutation_type perm_type)
Definition: idctdsp.c:39
h
h
Definition: vp9dsp_template.c:2038
MpegEncContext
MpegEncContext.
Definition: mpegvideo.h:70
ff_wmv1_scantable
const uint8_t ff_wmv1_scantable[WMV1_SCANTABLE_COUNT][64]
Definition: msmpeg4_vc1_data.c:221
ff_wmv2_common_init
av_cold void ff_wmv2_common_init(MpegEncContext *s)
Definition: wmv2.c:28