1 /*
2 * ATI VCR1 codec
3 * Copyright (c) 2003 Michael Niedermayer
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * ATI VCR1 codec
25 */
26
32
37
39 {
41
45 }
46
47 return 0;
48 }
49
52 {
54 const uint8_t *bytestream = avpkt->
data;
55 const uint8_t *bytestream_end = bytestream + avpkt->
size;
57
61 }
62
65
66 for (
i = 0;
i < 16;
i++) {
67 a->delta[
i] = *bytestream++;
68 bytestream++;
69 }
70
71 for (y = 0; y < avctx->
height; y++) {
73 uint8_t *luma = &
p->data[0][y *
p->linesize[0]];
74
75 if ((y & 3) == 0) {
76 uint8_t *
cb = &
p->data[1][(y >> 2) *
p->linesize[1]];
77 uint8_t *
cr = &
p->data[2][(y >> 2) *
p->linesize[2]];
78
80
81 for (
i = 0;
i < 4;
i++)
82 a->offset[
i] = *bytestream++;
83
84 offset =
a->offset[0] -
a->delta[bytestream[2] & 0xF];
85 for (x = 0; x < avctx->
width; x += 4) {
86 luma[0] =
offset +=
a->delta[bytestream[2] & 0xF];
87 luma[1] =
offset +=
a->delta[bytestream[2] >> 4];
88 luma[2] =
offset +=
a->delta[bytestream[0] & 0xF];
89 luma[3] =
offset +=
a->delta[bytestream[0] >> 4];
90 luma += 4;
91
92 *
cb++ = bytestream[3];
93 *
cr++ = bytestream[1];
94
95 bytestream += 4;
96 }
97 } else {
99
100 offset =
a->offset[y & 3] -
a->delta[bytestream[2] & 0xF];
101
102 for (x = 0; x < avctx->
width; x += 8) {
103 luma[0] =
offset +=
a->delta[bytestream[2] & 0xF];
104 luma[1] =
offset +=
a->delta[bytestream[2] >> 4];
105 luma[2] =
offset +=
a->delta[bytestream[3] & 0xF];
106 luma[3] =
offset +=
a->delta[bytestream[3] >> 4];
107 luma[4] =
offset +=
a->delta[bytestream[0] & 0xF];
108 luma[5] =
offset +=
a->delta[bytestream[0] >> 4];
109 luma[6] =
offset +=
a->delta[bytestream[1] & 0xF];
110 luma[7] =
offset +=
a->delta[bytestream[1] >> 4];
111 luma += 8;
112 bytestream += 4;
113 }
114 }
115 }
116
117 *got_frame = 1;
118
119 return bytestream - avpkt->
data;
120 }
121
131 };