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
|
/*
* PGX image format
* Copyright (c) 2020 Gautam Ramakrishnan
*
* 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
*/
#include "avcodec.h"
#include "internal.h"
#include "bytestream.h"
#include "codec_internal.h"
#include "libavutil/imgutils.h"
static int pgx_get_number(AVCodecContext *avctx, GetByteContext *g, int *number) {
int ret = AVERROR_INVALIDDATA;
char digit;
*number = 0;
while (1) {
uint64_t temp;
if (!bytestream2_get_bytes_left(g))
return AVERROR_INVALIDDATA;
digit = bytestream2_get_byte(g);
if (digit == ' ' || digit == 0xA || digit == 0xD)
break;
else if (digit < '0' || digit > '9')
return AVERROR_INVALIDDATA;
temp = (uint64_t)10 * (*number) + (digit - '0');
if (temp > INT_MAX)
return AVERROR_INVALIDDATA;
*number = temp;
ret = 0;
}
return ret;
}
static int pgx_decode_header(AVCodecContext *avctx, GetByteContext *g,
int *depth, int *width, int *height,
int *sign)
{
int byte;
if (bytestream2_get_bytes_left(g) < 6) {
return AVERROR_INVALIDDATA;
}
bytestream2_skip(g, 6);
// Is the component signed?
byte = bytestream2_peek_byte(g);
if (byte == '+') {
*sign = 0;
bytestream2_skip(g, 1);
} else if (byte == '-') {
*sign = 1;
bytestream2_skip(g, 1);
} else if (byte == 0)
goto error;
byte = bytestream2_peek_byte(g);
if (byte == ' ')
bytestream2_skip(g, 1);
else if (byte == 0)
goto error;
if (pgx_get_number(avctx, g, depth))
goto error;
if (pgx_get_number(avctx, g, width))
goto error;
if (pgx_get_number(avctx, g, height))
goto error;
if (bytestream2_peek_byte(g) == 0xA)
bytestream2_skip(g, 1);
return 0;
error:
av_log(avctx, AV_LOG_ERROR, "Error in decoding header.\n");
return AVERROR_INVALIDDATA;
}
#define WRITE_FRAME(D, PIXEL, suffix) \
static inline void write_frame_ ##D(AVFrame *frame, GetByteContext *g, \
int width, int height, int sign, int depth) \
{ \
int i, j; \
for (i = 0; i < height; i++) { \
PIXEL *line = (PIXEL*)frame->data[0] + i*frame->linesize[0]/sizeof(PIXEL); \
for (j = 0; j < width; j++) { \
unsigned val; \
if (sign) \
val = (PIXEL)bytestream2_get_ ##suffix(g) + (1 << (depth - 1)); \
else \
val = bytestream2_get_ ##suffix(g); \
val <<= (D - depth); \
*(line + j) = val; \
} \
} \
} \
WRITE_FRAME(8, int8_t, byte)
WRITE_FRAME(16, int16_t, be16)
static int pgx_decode_frame(AVCodecContext *avctx, AVFrame *p,
int *got_frame, AVPacket *avpkt)
{
int ret;
int bpp;
int width, height, depth;
int sign = 0;
GetByteContext g;
bytestream2_init(&g, avpkt->data, avpkt->size);
if ((ret = pgx_decode_header(avctx, &g, &depth, &width, &height, &sign)) < 0)
return ret;
if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
return ret;
if (depth > 0 && depth <= 8) {
avctx->pix_fmt = AV_PIX_FMT_GRAY8;
bpp = 8;
} else if (depth > 0 && depth <= 16) {
avctx->pix_fmt = AV_PIX_FMT_GRAY16;
bpp = 16;
} else {
av_log(avctx, AV_LOG_ERROR, "depth %d is invalid or unsupported.\n", depth);
return AVERROR_PATCHWELCOME;
}
if (bytestream2_get_bytes_left(&g) < width * height * (bpp >> 3))
return AVERROR_INVALIDDATA;
if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
return ret;
p->pict_type = AV_PICTURE_TYPE_I;
p->key_frame = 1;
avctx->bits_per_raw_sample = depth;
if (bpp == 8)
write_frame_8(p, &g, width, height, sign, depth);
else if (bpp == 16)
write_frame_16(p, &g, width, height, sign, depth);
*got_frame = 1;
return 0;
}
const FFCodec ff_pgx_decoder = {
.p.name = "pgx",
.p.long_name = NULL_IF_CONFIG_SMALL("PGX (JPEG2000 Test Format)"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_PGX,
.p.capabilities = AV_CODEC_CAP_DR1,
.decode = pgx_decode_frame,
};
|
