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
210
211
212
213
214
215
216
217
218
219
|
/*
* BRender PIX (.pix) image decoder
* Copyright (c) 2012 Aleksi Nurmi
*
* 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
*/
/*
* Tested against samples from I-War / Independence War and Defiance.
* If the PIX file does not contain a palette, the
* palette_has_changed property of the AVFrame is set to 0.
*/
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"
typedef struct BRPixHeader {
int format;
unsigned int width, height;
} BRPixHeader;
static int brpix_decode_header(BRPixHeader *out, GetByteContext *pgb)
{
unsigned int header_len = bytestream2_get_be32(pgb);
out->format = bytestream2_get_byte(pgb);
bytestream2_skip(pgb, 2);
out->width = bytestream2_get_be16(pgb);
out->height = bytestream2_get_be16(pgb);
// the header is at least 11 bytes long; we read the first 7
if (header_len < 11) {
return 0;
}
// skip the rest of the header
bytestream2_skip(pgb, header_len-7);
return 1;
}
static int brpix_decode_frame(AVCodecContext *avctx,
void *data, int *got_frame,
AVPacket *avpkt)
{
AVFrame *frame = data;
int ret;
GetByteContext gb;
unsigned int bytes_pp;
unsigned int magic[4];
unsigned int chunk_type;
unsigned int data_len;
BRPixHeader hdr;
bytestream2_init(&gb, avpkt->data, avpkt->size);
magic[0] = bytestream2_get_be32(&gb);
magic[1] = bytestream2_get_be32(&gb);
magic[2] = bytestream2_get_be32(&gb);
magic[3] = bytestream2_get_be32(&gb);
if (magic[0] != 0x12 ||
magic[1] != 0x8 ||
magic[2] != 0x2 ||
magic[3] != 0x2) {
av_log(avctx, AV_LOG_ERROR, "Not a BRender PIX file\n");
return AVERROR_INVALIDDATA;
}
chunk_type = bytestream2_get_be32(&gb);
if (chunk_type != 0x3 && chunk_type != 0x3d) {
av_log(avctx, AV_LOG_ERROR, "Invalid chunk type %d\n", chunk_type);
return AVERROR_INVALIDDATA;
}
ret = brpix_decode_header(&hdr, &gb);
if (!ret) {
av_log(avctx, AV_LOG_ERROR, "Invalid header length\n");
return AVERROR_INVALIDDATA;
}
switch (hdr.format) {
case 3:
avctx->pix_fmt = AV_PIX_FMT_PAL8;
bytes_pp = 1;
break;
case 4:
avctx->pix_fmt = AV_PIX_FMT_RGB555BE;
bytes_pp = 2;
break;
case 5:
avctx->pix_fmt = AV_PIX_FMT_RGB565BE;
bytes_pp = 2;
break;
case 6:
avctx->pix_fmt = AV_PIX_FMT_RGB24;
bytes_pp = 3;
break;
case 7:
avctx->pix_fmt = AV_PIX_FMT_0RGB;
bytes_pp = 4;
break;
case 18:
avctx->pix_fmt = AV_PIX_FMT_GRAY8A;
bytes_pp = 2;
break;
default:
av_log(avctx, AV_LOG_ERROR, "Format %d is not supported\n",
hdr.format);
return AVERROR_PATCHWELCOME;
}
if (av_image_check_size(hdr.width, hdr.height, 0, avctx) < 0)
return AVERROR_INVALIDDATA;
if (hdr.width != avctx->width || hdr.height != avctx->height)
avcodec_set_dimensions(avctx, hdr.width, hdr.height);
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
chunk_type = bytestream2_get_be32(&gb);
if (avctx->pix_fmt == AV_PIX_FMT_PAL8 &&
(chunk_type == 0x3 || chunk_type == 0x3d)) {
BRPixHeader palhdr;
uint32_t *pal_out = (uint32_t *)frame->data[1];
int i;
ret = brpix_decode_header(&palhdr, &gb);
if (!ret) {
av_log(avctx, AV_LOG_ERROR, "Invalid palette header length\n");
return AVERROR_INVALIDDATA;
}
if (palhdr.format != 7) {
av_log(avctx, AV_LOG_ERROR, "Palette is not in 0RGB format\n");
return AVERROR_INVALIDDATA;
}
chunk_type = bytestream2_get_be32(&gb);
data_len = bytestream2_get_be32(&gb);
bytestream2_skip(&gb, 8);
if (chunk_type != 0x21 || data_len != 1032 ||
bytestream2_get_bytes_left(&gb) < 1032) {
av_log(avctx, AV_LOG_ERROR, "Invalid palette data\n");
return AVERROR_INVALIDDATA;
}
// convert 0RGB to machine endian format (ARGB32)
for (i = 0; i < 256; ++i) {
bytestream2_skipu(&gb, 1);
*pal_out++ = (0xFFU << 24) | bytestream2_get_be24u(&gb);
}
bytestream2_skip(&gb, 8);
frame->palette_has_changed = 1;
chunk_type = bytestream2_get_be32(&gb);
} else if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
uint32_t *pal_out = (uint32_t *)frame->data[1];
int i;
for (i = 0; i < 256; ++i) {
*pal_out++ = (0xFFU << 24) | (i * 0x010101);
}
frame->palette_has_changed = 1;
}
data_len = bytestream2_get_be32(&gb);
bytestream2_skip(&gb, 8);
// read the image data to the buffer
{
unsigned int bytes_per_scanline = bytes_pp * hdr.width;
unsigned int bytes_left = bytestream2_get_bytes_left(&gb);
if (chunk_type != 0x21 || data_len != bytes_left ||
bytes_left / bytes_per_scanline < hdr.height)
{
av_log(avctx, AV_LOG_ERROR, "Invalid image data\n");
return AVERROR_INVALIDDATA;
}
av_image_copy_plane(frame->data[0], frame->linesize[0],
avpkt->data + bytestream2_tell(&gb),
bytes_per_scanline,
bytes_per_scanline, hdr.height);
}
*got_frame = 1;
return avpkt->size;
}
AVCodec ff_brender_pix_decoder = {
.name = "brender_pix",
.long_name = NULL_IF_CONFIG_SMALL("BRender PIX image"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_BRENDER_PIX,
.decode = brpix_decode_frame,
.capabilities = CODEC_CAP_DR1,
};
|
