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
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
|
/*
* Sun Rasterfile (.sun/.ras/im{1,8,24}/.sunras) image decoder
* Copyright (c) 2007, 2008 Ivo van Poorten
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "internal.h"
#include "sunrast.h"
typedef struct SUNRASTContext {
AVFrame picture;
} SUNRASTContext;
static av_cold int sunrast_init(AVCodecContext *avctx) {
SUNRASTContext *s = avctx->priv_data;
avcodec_get_frame_defaults(&s->picture);
avctx->coded_frame = &s->picture;
return 0;
}
static int sunrast_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
const uint8_t *buf_end = avpkt->data + avpkt->size;
SUNRASTContext * const s = avctx->priv_data;
AVFrame *picture = data;
AVFrame * const p = &s->picture;
unsigned int w, h, depth, type, maptype, maplength, stride, x, y, len, alen;
uint8_t *ptr;
const uint8_t *bufstart = buf;
int ret;
if (avpkt->size < 32)
return AVERROR_INVALIDDATA;
if (AV_RB32(buf) != RAS_MAGIC) {
av_log(avctx, AV_LOG_ERROR, "this is not sunras encoded data\n");
return AVERROR_INVALIDDATA;
}
w = AV_RB32(buf + 4);
h = AV_RB32(buf + 8);
depth = AV_RB32(buf + 12);
type = AV_RB32(buf + 20);
maptype = AV_RB32(buf + 24);
maplength = AV_RB32(buf + 28);
buf += 32;
if (type == RT_FORMAT_TIFF || type == RT_FORMAT_IFF || type == RT_EXPERIMENTAL) {
av_log_ask_for_sample(avctx, "unsupported (compression) type\n");
return AVERROR_PATCHWELCOME;
}
if (type > RT_FORMAT_IFF) {
av_log(avctx, AV_LOG_ERROR, "invalid (compression) type\n");
return AVERROR_INVALIDDATA;
}
if (av_image_check_size(w, h, 0, avctx)) {
av_log(avctx, AV_LOG_ERROR, "invalid image size\n");
return AVERROR_INVALIDDATA;
}
if (maptype == RMT_RAW) {
av_log_ask_for_sample(avctx, "unsupported colormap type\n");
return AVERROR_PATCHWELCOME;
}
if (maptype > RMT_RAW) {
av_log(avctx, AV_LOG_ERROR, "invalid colormap type\n");
return AVERROR_INVALIDDATA;
}
switch (depth) {
case 1:
avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
break;
case 8:
avctx->pix_fmt = maplength ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_GRAY8;
break;
case 24:
avctx->pix_fmt = (type == RT_FORMAT_RGB) ? AV_PIX_FMT_RGB24 : AV_PIX_FMT_BGR24;
break;
default:
av_log(avctx, AV_LOG_ERROR, "invalid depth\n");
return AVERROR_INVALIDDATA;
}
if (p->data[0])
avctx->release_buffer(avctx, p);
if (w != avctx->width || h != avctx->height)
avcodec_set_dimensions(avctx, w, h);
if ((ret = ff_get_buffer(avctx, p)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return ret;
}
p->pict_type = AV_PICTURE_TYPE_I;
if (buf_end - buf < maplength)
return AVERROR_INVALIDDATA;
if (depth != 8 && maplength) {
av_log(avctx, AV_LOG_WARNING, "useless colormap found or file is corrupted, trying to recover\n");
} else if (maplength) {
unsigned int len = maplength / 3;
if (maplength % 3 || maplength > 768) {
av_log(avctx, AV_LOG_WARNING, "invalid colormap length\n");
return AVERROR_INVALIDDATA;
}
ptr = p->data[1];
for (x = 0; x < len; x++, ptr += 4)
*(uint32_t *)ptr = (buf[x] << 16) + (buf[len + x] << 8) + buf[len + len + x];
}
buf += maplength;
ptr = p->data[0];
stride = p->linesize[0];
/* scanlines are aligned on 16 bit boundaries */
len = (depth * w + 7) >> 3;
alen = len + (len & 1);
if (type == RT_BYTE_ENCODED) {
int value, run;
uint8_t *end = ptr + h * stride;
x = 0;
while (ptr != end && buf < buf_end) {
run = 1;
if (buf_end - buf < 1)
return AVERROR_INVALIDDATA;
if ((value = *buf++) == RLE_TRIGGER) {
run = *buf++ + 1;
if (run != 1)
value = *buf++;
}
while (run--) {
if (x < len)
ptr[x] = value;
if (++x >= alen) {
x = 0;
ptr += stride;
if (ptr == end)
break;
}
}
}
} else {
for (y = 0; y < h; y++) {
if (buf_end - buf < len)
break;
memcpy(ptr, buf, len);
ptr += stride;
buf += alen;
}
}
*picture = s->picture;
*got_frame = 1;
return buf - bufstart;
}
static av_cold int sunrast_end(AVCodecContext *avctx) {
SUNRASTContext *s = avctx->priv_data;
if(s->picture.data[0])
avctx->release_buffer(avctx, &s->picture);
return 0;
}
AVCodec ff_sunrast_decoder = {
.name = "sunrast",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_SUNRAST,
.priv_data_size = sizeof(SUNRASTContext),
.init = sunrast_init,
.close = sunrast_end,
.decode = sunrast_decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"),
};
|
