FFmpeg
wmv2.c
Go to the documentation of this file.
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 "simple_idct.h"
27 #include "wmv2.h"
28 #include "wmv2data.h"
29 
30 
31 av_cold void ff_wmv2_common_init(Wmv2Context *w)
32 {
33  MpegEncContext *const s = &w->s;
34 
35  ff_blockdsp_init(&s->bdsp, s->avctx);
36  ff_wmv2dsp_init(&w->wdsp);
37  s->idsp.perm_type = w->wdsp.idct_perm;
38  ff_init_scantable_permutation(s->idsp.idct_permutation,
39  w->wdsp.idct_perm);
40  ff_init_scantable(s->idsp.idct_permutation, &w->abt_scantable[0],
41  ff_wmv2_scantableA);
42  ff_init_scantable(s->idsp.idct_permutation, &w->abt_scantable[1],
43  ff_wmv2_scantableB);
44  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable,
45  ff_wmv1_scantable[1]);
46  ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable,
47  ff_wmv1_scantable[2]);
48  ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable,
49  ff_wmv1_scantable[3]);
50  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable,
51  ff_wmv1_scantable[0]);
52  s->idsp.idct_put = w->wdsp.idct_put;
53  s->idsp.idct_add = w->wdsp.idct_add;
54  s->idsp.idct = NULL;
55 }
56 
57 static void wmv2_add_block(Wmv2Context *w, int16_t *block1,
58  uint8_t *dst, int stride, int n)
59 {
60  MpegEncContext *const s = &w->s;
61 
62  if (s->block_last_index[n] >= 0) {
63  switch (w->abt_type_table[n]) {
64  case 0:
65  w->wdsp.idct_add(dst, stride, block1);
66  break;
67  case 1:
68  ff_simple_idct84_add(dst, stride, block1);
69  ff_simple_idct84_add(dst + 4 * stride, stride, w->abt_block2[n]);
70  s->bdsp.clear_block(w->abt_block2[n]);
71  break;
72  case 2:
73  ff_simple_idct48_add(dst, stride, block1);
74  ff_simple_idct48_add(dst + 4, stride, w->abt_block2[n]);
75  s->bdsp.clear_block(w->abt_block2[n]);
76  break;
77  default:
78  av_log(s->avctx, AV_LOG_ERROR, "internal error in WMV2 abt\n");
79  }
80  }
81 }
82 
83 void ff_wmv2_add_mb(MpegEncContext *s, int16_t block1[6][64],
84  uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr)
85 {
86  Wmv2Context *const w = (Wmv2Context *) s;
87 
88  wmv2_add_block(w, block1[0], dest_y, s->linesize, 0);
89  wmv2_add_block(w, block1[1], dest_y + 8, s->linesize, 1);
90  wmv2_add_block(w, block1[2], dest_y + 8 * s->linesize, s->linesize, 2);
91  wmv2_add_block(w, block1[3], dest_y + 8 + 8 * s->linesize, s->linesize, 3);
92 
93  if (s->avctx->flags & AV_CODEC_FLAG_GRAY)
94  return;
95 
96  wmv2_add_block(w, block1[4], dest_cb, s->uvlinesize, 4);
97  wmv2_add_block(w, block1[5], dest_cr, s->uvlinesize, 5);
98 }
99 
100 void ff_mspel_motion(MpegEncContext *s, uint8_t *dest_y,
101  uint8_t *dest_cb, uint8_t *dest_cr,
102  uint8_t **ref_picture, op_pixels_func (*pix_op)[4],
103  int motion_x, int motion_y, int h)
104 {
105  Wmv2Context *const w = (Wmv2Context *) s;
106  uint8_t *ptr;
107  int dxy, mx, my, src_x, src_y, v_edge_pos;
108  ptrdiff_t offset, linesize, uvlinesize;
109  int emu = 0;
110 
111  dxy = ((motion_y & 1) << 1) | (motion_x & 1);
112  dxy = 2 * dxy + w->hshift;
113  src_x = s->mb_x * 16 + (motion_x >> 1);
114  src_y = s->mb_y * 16 + (motion_y >> 1);
115 
116  /* WARNING: do no forget half pels */
117  v_edge_pos = s->v_edge_pos;
118  src_x = av_clip(src_x, -16, s->width);
119  src_y = av_clip(src_y, -16, s->height);
120 
121  if (src_x <= -16 || src_x >= s->width)
122  dxy &= ~3;
123  if (src_y <= -16 || src_y >= s->height)
124  dxy &= ~4;
125 
126  linesize = s->linesize;
127  uvlinesize = s->uvlinesize;
128  ptr = ref_picture[0] + (src_y * linesize) + src_x;
129 
130  if (src_x < 1 || src_y < 1 || src_x + 17 >= s->h_edge_pos ||
131  src_y + h + 1 >= v_edge_pos) {
132  s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, ptr - 1 - s->linesize,
133  s->linesize, s->linesize, 19, 19,
134  src_x - 1, src_y - 1,
135  s->h_edge_pos, s->v_edge_pos);
136  ptr = s->sc.edge_emu_buffer + 1 + s->linesize;
137  emu = 1;
138  }
139 
140  w->wdsp.put_mspel_pixels_tab[dxy](dest_y, ptr, linesize);
141  w->wdsp.put_mspel_pixels_tab[dxy](dest_y + 8, ptr + 8, linesize);
142  w->wdsp.put_mspel_pixels_tab[dxy](dest_y + 8 * linesize, ptr + 8 * linesize, linesize);
143  w->wdsp.put_mspel_pixels_tab[dxy](dest_y + 8 + 8 * linesize, ptr + 8 + 8 * linesize, linesize);
144 
145  if (s->avctx->flags & AV_CODEC_FLAG_GRAY)
146  return;
147 
148  dxy = 0;
149  if ((motion_x & 3) != 0)
150  dxy |= 1;
151  if ((motion_y & 3) != 0)
152  dxy |= 2;
153  mx = motion_x >> 2;
154  my = motion_y >> 2;
155 
156  src_x = s->mb_x * 8 + mx;
157  src_y = s->mb_y * 8 + my;
158  src_x = av_clip(src_x, -8, s->width >> 1);
159  if (src_x == (s->width >> 1))
160  dxy &= ~1;
161  src_y = av_clip(src_y, -8, s->height >> 1);
162  if (src_y == (s->height >> 1))
163  dxy &= ~2;
164  offset = (src_y * uvlinesize) + src_x;
165  ptr = ref_picture[1] + offset;
166  if (emu) {
167  s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, ptr,
168  s->uvlinesize, s->uvlinesize,
169  9, 9,
170  src_x, src_y,
171  s->h_edge_pos >> 1, s->v_edge_pos >> 1);
172  ptr = s->sc.edge_emu_buffer;
173  }
174  pix_op[1][dxy](dest_cb, ptr, uvlinesize, h >> 1);
175 
176  ptr = ref_picture[2] + offset;
177  if (emu) {
178  s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, ptr,
179  s->uvlinesize, s->uvlinesize,
180  9, 9,
181  src_x, src_y,
182  s->h_edge_pos >> 1, s->v_edge_pos >> 1);
183  ptr = s->sc.edge_emu_buffer;
184  }
185  pix_op[1][dxy](dest_cr, ptr, uvlinesize, h >> 1);
186 }
stride
int stride
Definition: mace.c:144
ff_init_scantable
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: idctdsp.c:29
n
int n
Definition: avisynth_c.h:760
ff_wmv1_scantable
const uint8_t ff_wmv1_scantable[WMV1_SCANTABLE_COUNT][64]
Definition: msmpeg4data.c:1809
w
uint8_t w
Definition: llviddspenc.c:38
ff_simple_idct84_add
void ff_simple_idct84_add(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
Definition: simple_idct.c:195
ff_wmv2_common_init
av_cold void ff_wmv2_common_init(Wmv2Context *w)
Definition: wmv2.c:31
mpegvideo.h
mpegutils.h
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
av_cold
#define av_cold
Definition: attributes.h:84
msmpeg4data.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
wmv2data.h
ff_simple_idct48_add
void ff_simple_idct48_add(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
Definition: simple_idct.c:210
simple_idct.h
NULL
#define NULL
Definition: coverity.c:32
ff_wmv2dsp_init
av_cold void ff_wmv2dsp_init(WMV2DSPContext *c)
Definition: wmv2dsp.c:251
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:883
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
wmv2_add_block
static void wmv2_add_block(Wmv2Context *w, int16_t *block1, uint8_t *dst, int stride, int n)
Definition: wmv2.c:57
uint8_t
uint8_t
Definition: audio_convert.c:194
ff_wmv2_add_mb
void ff_wmv2_add_mb(MpegEncContext *s, int16_t block1[6][64], uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr)
Definition: wmv2.c:83
idctdsp.h
avcodec.h
Wmv2Context
Definition: wmv2.h:35
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
h
h
Definition: vp9dsp_template.c:2038
ff_blockdsp_init
av_cold void ff_blockdsp_init(BlockDSPContext *c, AVCodecContext *avctx)
Definition: blockdsp.c:60
MpegEncContext
MpegEncContext.
Definition: mpegvideo.h:81
block1
static int16_t block1[64]
Definition: dct.c:116
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:100
Generated on Wed Aug 24 2022 21:27:04 for FFmpeg by   doxygen 1.8.17