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 "mpegutils.h"
24 #include "mpegvideo.h"
25 #include "msmpeg4data.h"
26 #include "wmv2.h"
27 #include "wmv2data.h"
28 
29 
31 {
32  MpegEncContext *const s = &w->s;
33 
34  ff_blockdsp_init(&s->bdsp, s->avctx);
35  ff_wmv2dsp_init(&w->wdsp);
36  s->idsp.perm_type = w->wdsp.idct_perm;
37  ff_init_scantable_permutation(s->idsp.idct_permutation,
38  w->wdsp.idct_perm);
39  ff_init_scantable(s->idsp.idct_permutation, &w->abt_scantable[0],
41  ff_init_scantable(s->idsp.idct_permutation, &w->abt_scantable[1],
43  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable,
45  ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable,
47  ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable,
49  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable,
51  s->idsp.idct_put = w->wdsp.idct_put;
52  s->idsp.idct_add = w->wdsp.idct_add;
53  s->idsp.idct = NULL;
54 }
55 
56 void ff_mspel_motion(MpegEncContext *s, uint8_t *dest_y,
57  uint8_t *dest_cb, uint8_t *dest_cr,
58  uint8_t **ref_picture, op_pixels_func (*pix_op)[4],
59  int motion_x, int motion_y, int h)
60 {
61  Wmv2Context *const w = (Wmv2Context *) s;
62  uint8_t *ptr;
63  int dxy, mx, my, src_x, src_y, v_edge_pos;
64  ptrdiff_t offset, linesize, uvlinesize;
65  int emu = 0;
66 
67  dxy = ((motion_y & 1) << 1) | (motion_x & 1);
68  dxy = 2 * dxy + w->hshift;
69  src_x = s->mb_x * 16 + (motion_x >> 1);
70  src_y = s->mb_y * 16 + (motion_y >> 1);
71 
72  /* WARNING: do no forget half pels */
73  v_edge_pos = s->v_edge_pos;
74  src_x = av_clip(src_x, -16, s->width);
75  src_y = av_clip(src_y, -16, s->height);
76 
77  if (src_x <= -16 || src_x >= s->width)
78  dxy &= ~3;
79  if (src_y <= -16 || src_y >= s->height)
80  dxy &= ~4;
81 
82  linesize = s->linesize;
83  uvlinesize = s->uvlinesize;
84  ptr = ref_picture[0] + (src_y * linesize) + src_x;
85 
86  if (src_x < 1 || src_y < 1 || src_x + 17 >= s->h_edge_pos ||
87  src_y + h + 1 >= v_edge_pos) {
88  s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, ptr - 1 - s->linesize,
89  s->linesize, s->linesize, 19, 19,
90  src_x - 1, src_y - 1,
91  s->h_edge_pos, s->v_edge_pos);
92  ptr = s->sc.edge_emu_buffer + 1 + s->linesize;
93  emu = 1;
94  }
95 
96  w->wdsp.put_mspel_pixels_tab[dxy](dest_y, ptr, linesize);
97  w->wdsp.put_mspel_pixels_tab[dxy](dest_y + 8, ptr + 8, linesize);
98  w->wdsp.put_mspel_pixels_tab[dxy](dest_y + 8 * linesize, ptr + 8 * linesize, linesize);
99  w->wdsp.put_mspel_pixels_tab[dxy](dest_y + 8 + 8 * linesize, ptr + 8 + 8 * linesize, linesize);
100 
101  if (s->avctx->flags & AV_CODEC_FLAG_GRAY)
102  return;
103 
104  dxy = 0;
105  if ((motion_x & 3) != 0)
106  dxy |= 1;
107  if ((motion_y & 3) != 0)
108  dxy |= 2;
109  mx = motion_x >> 2;
110  my = motion_y >> 2;
111 
112  src_x = s->mb_x * 8 + mx;
113  src_y = s->mb_y * 8 + my;
114  src_x = av_clip(src_x, -8, s->width >> 1);
115  if (src_x == (s->width >> 1))
116  dxy &= ~1;
117  src_y = av_clip(src_y, -8, s->height >> 1);
118  if (src_y == (s->height >> 1))
119  dxy &= ~2;
120  offset = (src_y * uvlinesize) + src_x;
121  ptr = ref_picture[1] + offset;
122  if (emu) {
123  s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, ptr,
124  s->uvlinesize, s->uvlinesize,
125  9, 9,
126  src_x, src_y,
127  s->h_edge_pos >> 1, s->v_edge_pos >> 1);
128  ptr = s->sc.edge_emu_buffer;
129  }
130  pix_op[1][dxy](dest_cb, ptr, uvlinesize, h >> 1);
131 
132  ptr = ref_picture[2] + offset;
133  if (emu) {
134  s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, ptr,
135  s->uvlinesize, s->uvlinesize,
136  9, 9,
137  src_x, src_y,
138  s->h_edge_pos >> 1, s->v_edge_pos >> 1);
139  ptr = s->sc.edge_emu_buffer;
140  }
141  pix_op[1][dxy](dest_cr, ptr, uvlinesize, h >> 1);
142 }
ff_init_scantable
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: idctdsp.c:29
av_clip
#define av_clip
Definition: common.h:96
ff_wmv1_scantable
const uint8_t ff_wmv1_scantable[WMV1_SCANTABLE_COUNT][64]
Definition: msmpeg4data.c:1806
w
uint8_t w
Definition: llviddspenc.c:38
ff_wmv2_common_init
av_cold void ff_wmv2_common_init(Wmv2Context *w)
Definition: wmv2.c:30
mpegvideo.h
mpegutils.h
av_cold
#define av_cold
Definition: attributes.h:90
msmpeg4data.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
wmv2data.h
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:243
ff_wmv2_scantableB
const uint8_t ff_wmv2_scantableB[64]
Definition: wmv2data.c:30
ff_wmv2_scantableA
const uint8_t ff_wmv2_scantableA[64]
Definition: wmv2data.c:23
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_permutation
av_cold void ff_init_scantable_permutation(uint8_t *idct_permutation, enum idct_permutation_type perm_type)
Definition: idctdsp.c:50
idctdsp.h
avcodec.h
Wmv2Context
Definition: wmv2.h:36
h
h
Definition: vp9dsp_template.c:2038
ff_blockdsp_init
av_cold void ff_blockdsp_init(BlockDSPContext *c, AVCodecContext *avctx)
Definition: blockdsp.c:59
MpegEncContext
MpegEncContext.
Definition: mpegvideo.h:69
ff_mspel_motion
void 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)
Definition: wmv2.c:56