1 |
|
|
/* |
2 |
|
|
* Brute Force & Ignorance (BFI) video decoder |
3 |
|
|
* Copyright (c) 2008 Sisir Koppaka |
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 |
|
|
* @brief Brute Force & Ignorance (.bfi) video decoder |
25 |
|
|
* @author Sisir Koppaka ( sisir.koppaka at gmail dot com ) |
26 |
|
|
* @see http://wiki.multimedia.cx/index.php?title=BFI |
27 |
|
|
*/ |
28 |
|
|
|
29 |
|
|
#include "libavutil/common.h" |
30 |
|
|
#include "avcodec.h" |
31 |
|
|
#include "bytestream.h" |
32 |
|
|
#include "internal.h" |
33 |
|
|
|
34 |
|
|
typedef struct BFIContext { |
35 |
|
|
AVCodecContext *avctx; |
36 |
|
|
uint8_t *dst; |
37 |
|
|
uint32_t pal[256]; |
38 |
|
|
} BFIContext; |
39 |
|
|
|
40 |
|
2 |
static av_cold int bfi_decode_init(AVCodecContext *avctx) |
41 |
|
|
{ |
42 |
|
2 |
BFIContext *bfi = avctx->priv_data; |
43 |
|
2 |
avctx->pix_fmt = AV_PIX_FMT_PAL8; |
44 |
|
2 |
bfi->dst = av_mallocz(avctx->width * avctx->height); |
45 |
✗✓ |
2 |
if (!bfi->dst) |
46 |
|
|
return AVERROR(ENOMEM); |
47 |
|
2 |
return 0; |
48 |
|
|
} |
49 |
|
|
|
50 |
|
57 |
static int bfi_decode_frame(AVCodecContext *avctx, void *data, |
51 |
|
|
int *got_frame, AVPacket *avpkt) |
52 |
|
|
{ |
53 |
|
57 |
AVFrame *frame = data; |
54 |
|
|
GetByteContext g; |
55 |
|
57 |
int buf_size = avpkt->size; |
56 |
|
57 |
BFIContext *bfi = avctx->priv_data; |
57 |
|
57 |
uint8_t *dst = bfi->dst; |
58 |
|
|
uint8_t *src, *dst_offset, colour1, colour2; |
59 |
|
57 |
uint8_t *frame_end = bfi->dst + avctx->width * avctx->height; |
60 |
|
|
uint32_t *pal; |
61 |
|
57 |
int i, j, ret, height = avctx->height; |
62 |
|
|
|
63 |
✗✓ |
57 |
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
64 |
|
|
return ret; |
65 |
|
|
|
66 |
|
57 |
bytestream2_init(&g, avpkt->data, buf_size); |
67 |
|
|
|
68 |
|
|
/* Set frame parameters and palette, if necessary */ |
69 |
✓✓ |
57 |
if (!avctx->frame_number) { |
70 |
|
1 |
frame->pict_type = AV_PICTURE_TYPE_I; |
71 |
|
1 |
frame->key_frame = 1; |
72 |
|
|
/* Setting the palette */ |
73 |
✗✓ |
1 |
if (avctx->extradata_size > 768) { |
74 |
|
|
av_log(avctx, AV_LOG_ERROR, "Palette is too large.\n"); |
75 |
|
|
return AVERROR_INVALIDDATA; |
76 |
|
|
} |
77 |
|
1 |
pal = (uint32_t *)frame->data[1]; |
78 |
✓✓ |
257 |
for (i = 0; i < avctx->extradata_size / 3; i++) { |
79 |
|
256 |
int shift = 16; |
80 |
|
256 |
*pal = 0xFFU << 24; |
81 |
✓✓ |
1024 |
for (j = 0; j < 3; j++, shift -= 8) |
82 |
|
768 |
*pal += ((avctx->extradata[i * 3 + j] << 2) | |
83 |
|
768 |
(avctx->extradata[i * 3 + j] >> 4)) << shift; |
84 |
|
256 |
pal++; |
85 |
|
|
} |
86 |
|
1 |
memcpy(bfi->pal, frame->data[1], sizeof(bfi->pal)); |
87 |
|
1 |
frame->palette_has_changed = 1; |
88 |
|
|
} else { |
89 |
|
56 |
frame->pict_type = AV_PICTURE_TYPE_P; |
90 |
|
56 |
frame->key_frame = 0; |
91 |
|
56 |
frame->palette_has_changed = 0; |
92 |
|
56 |
memcpy(frame->data[1], bfi->pal, sizeof(bfi->pal)); |
93 |
|
|
} |
94 |
|
|
|
95 |
|
57 |
bytestream2_skip(&g, 4); // Unpacked size, not required. |
96 |
|
|
|
97 |
|
57 |
while (dst != frame_end) { |
98 |
|
|
static const uint8_t lentab[4] = { 0, 2, 0, 1 }; |
99 |
|
319585 |
unsigned int byte = bytestream2_get_byte(&g), av_uninit(offset); |
100 |
|
319585 |
unsigned int code = byte >> 6; |
101 |
|
319585 |
unsigned int length = byte & ~0xC0; |
102 |
|
|
|
103 |
✗✓ |
319585 |
if (!bytestream2_get_bytes_left(&g)) { |
104 |
|
|
av_log(avctx, AV_LOG_ERROR, |
105 |
|
|
"Input resolution larger than actual frame.\n"); |
106 |
|
|
return AVERROR_INVALIDDATA; |
107 |
|
|
} |
108 |
|
|
|
109 |
|
|
/* Get length and offset (if required) */ |
110 |
✓✓ |
319585 |
if (length == 0) { |
111 |
✓✓ |
46045 |
if (code == 1) { |
112 |
|
44996 |
length = bytestream2_get_byte(&g); |
113 |
|
44996 |
offset = bytestream2_get_le16(&g); |
114 |
|
|
} else { |
115 |
|
1049 |
length = bytestream2_get_le16(&g); |
116 |
✓✓✗✓
|
1049 |
if (code == 2 && length == 0) |
117 |
|
|
break; |
118 |
|
|
} |
119 |
|
|
} else { |
120 |
✓✓ |
273540 |
if (code == 1) |
121 |
|
7005 |
offset = bytestream2_get_byte(&g); |
122 |
|
|
} |
123 |
|
|
|
124 |
|
|
/* Do boundary check */ |
125 |
✗✓ |
319585 |
if (dst + (length << lentab[code]) > frame_end) |
126 |
|
|
break; |
127 |
|
|
|
128 |
✓✓✓✓ ✗ |
319585 |
switch (code) { |
129 |
|
124968 |
case 0: // normal chain |
130 |
✗✓ |
124968 |
if (length >= bytestream2_get_bytes_left(&g)) { |
131 |
|
|
av_log(avctx, AV_LOG_ERROR, "Frame larger than buffer.\n"); |
132 |
|
|
return AVERROR_INVALIDDATA; |
133 |
|
|
} |
134 |
|
124968 |
bytestream2_get_buffer(&g, dst, length); |
135 |
|
124968 |
dst += length; |
136 |
|
124968 |
break; |
137 |
|
52001 |
case 1: // back chain |
138 |
|
52001 |
dst_offset = dst - offset; |
139 |
|
52001 |
length *= 4; // Convert dwords to bytes. |
140 |
✗✓ |
52001 |
if (dst_offset < bfi->dst) |
141 |
|
|
break; |
142 |
✓✓ |
871277 |
while (length--) |
143 |
|
819276 |
*dst++ = *dst_offset++; |
144 |
|
52001 |
break; |
145 |
|
133856 |
case 2: // skip chain |
146 |
|
133856 |
dst += length; |
147 |
|
133856 |
break; |
148 |
|
8760 |
case 3: // fill chain |
149 |
|
8760 |
colour1 = bytestream2_get_byte(&g); |
150 |
|
8760 |
colour2 = bytestream2_get_byte(&g); |
151 |
✓✓ |
44349 |
while (length--) { |
152 |
|
35589 |
*dst++ = colour1; |
153 |
|
35589 |
*dst++ = colour2; |
154 |
|
|
} |
155 |
|
8760 |
break; |
156 |
|
|
} |
157 |
✓✓ |
319642 |
} |
158 |
|
|
|
159 |
|
57 |
src = bfi->dst; |
160 |
|
57 |
dst = frame->data[0]; |
161 |
✓✓ |
8037 |
while (height--) { |
162 |
|
7980 |
memcpy(dst, src, avctx->width); |
163 |
|
7980 |
src += avctx->width; |
164 |
|
7980 |
dst += frame->linesize[0]; |
165 |
|
|
} |
166 |
|
57 |
*got_frame = 1; |
167 |
|
|
|
168 |
|
57 |
return buf_size; |
169 |
|
|
} |
170 |
|
|
|
171 |
|
2 |
static av_cold int bfi_decode_close(AVCodecContext *avctx) |
172 |
|
|
{ |
173 |
|
2 |
BFIContext *bfi = avctx->priv_data; |
174 |
|
2 |
av_freep(&bfi->dst); |
175 |
|
2 |
return 0; |
176 |
|
|
} |
177 |
|
|
|
178 |
|
|
AVCodec ff_bfi_decoder = { |
179 |
|
|
.name = "bfi", |
180 |
|
|
.long_name = NULL_IF_CONFIG_SMALL("Brute Force & Ignorance"), |
181 |
|
|
.type = AVMEDIA_TYPE_VIDEO, |
182 |
|
|
.id = AV_CODEC_ID_BFI, |
183 |
|
|
.priv_data_size = sizeof(BFIContext), |
184 |
|
|
.init = bfi_decode_init, |
185 |
|
|
.close = bfi_decode_close, |
186 |
|
|
.decode = bfi_decode_frame, |
187 |
|
|
.capabilities = AV_CODEC_CAP_DR1, |
188 |
|
|
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, |
189 |
|
|
}; |