1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
|
/*
* Autodesk RLE Decoder
* Copyright (C) 2005 The FFmpeg project
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Autodesk RLE Video Decoder by Konstantin Shishkov
*/
#include <string.h>
#include "avcodec.h"
#include "codec_internal.h"
#include "decode.h"
#include "msrledec.h"
typedef struct AascContext {
AVCodecContext *avctx;
GetByteContext gb;
AVFrame *frame;
uint32_t palette[AVPALETTE_COUNT];
int palette_size;
} AascContext;
static av_cold int aasc_decode_init(AVCodecContext *avctx)
{
AascContext *s = avctx->priv_data;
uint8_t *ptr;
int i;
s->avctx = avctx;
switch (avctx->bits_per_coded_sample) {
case 8:
avctx->pix_fmt = AV_PIX_FMT_PAL8;
ptr = avctx->extradata;
s->palette_size = FFMIN(avctx->extradata_size, AVPALETTE_SIZE);
for (i = 0; i < s->palette_size / 4; i++) {
s->palette[i] = 0xFFU << 24 | AV_RL32(ptr);
ptr += 4;
}
break;
case 16:
avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
break;
case 24:
avctx->pix_fmt = AV_PIX_FMT_BGR24;
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unsupported bit depth: %d\n", avctx->bits_per_coded_sample);
return -1;
}
s->frame = av_frame_alloc();
if (!s->frame)
return AVERROR(ENOMEM);
return 0;
}
static int aasc_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
int *got_frame, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
AascContext *s = avctx->priv_data;
int compr, i, stride, psize, ret;
if (buf_size < 4) {
av_log(avctx, AV_LOG_ERROR, "frame too short\n");
return AVERROR_INVALIDDATA;
}
if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
return ret;
compr = AV_RL32(buf);
buf += 4;
buf_size -= 4;
psize = avctx->bits_per_coded_sample / 8;
switch (avctx->codec_tag) {
case MKTAG('A', 'A', 'S', '4'):
bytestream2_init(&s->gb, buf - 4, buf_size + 4);
ff_msrle_decode(avctx, s->frame, 8, &s->gb);
break;
case MKTAG('A', 'A', 'S', 'C'):
switch (compr) {
case 0:
stride = (avctx->width * psize + psize) & ~psize;
if (buf_size < stride * avctx->height)
return AVERROR_INVALIDDATA;
for (i = avctx->height - 1; i >= 0; i--) {
memcpy(s->frame->data[0] + i * s->frame->linesize[0], buf, avctx->width * psize);
buf += stride;
buf_size -= stride;
}
break;
case 1:
bytestream2_init(&s->gb, buf, buf_size);
ff_msrle_decode(avctx, s->frame, 8, &s->gb);
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unknown compression type %d\n", compr);
return AVERROR_INVALIDDATA;
}
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unknown FourCC: %X\n", avctx->codec_tag);
return -1;
}
if (avctx->pix_fmt == AV_PIX_FMT_PAL8)
memcpy(s->frame->data[1], s->palette, s->palette_size);
*got_frame = 1;
if ((ret = av_frame_ref(rframe, s->frame)) < 0)
return ret;
/* report that the buffer was completely consumed */
return avpkt->size;
}
static av_cold int aasc_decode_end(AVCodecContext *avctx)
{
AascContext *s = avctx->priv_data;
av_frame_free(&s->frame);
return 0;
}
const FFCodec ff_aasc_decoder = {
.p.name = "aasc",
CODEC_LONG_NAME("Autodesk RLE"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_AASC,
.priv_data_size = sizeof(AascContext),
.init = aasc_decode_init,
.close = aasc_decode_end,
FF_CODEC_DECODE_CB(aasc_decode_frame),
.p.capabilities = AV_CODEC_CAP_DR1,
};
|
