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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 | static av_cold int bfi_decode_init(AVCodecContext *avctx) | |
41 | { | |
42 | BFIContext *bfi = avctx->priv_data; | |
43 | avctx->pix_fmt = AV_PIX_FMT_PAL8; | |
44 | bfi->dst = av_mallocz(avctx->width * avctx->height); | |
45 | if (!bfi->dst) | |
46 | return AVERROR(ENOMEM); | |
47 | return 0; | |
48 | } | |
49 | ||
50 | static int bfi_decode_frame(AVCodecContext *avctx, void *data, | |
51 | int *got_frame, AVPacket *avpkt) | |
52 | { | |
53 | AVFrame *frame = data; | |
54 | GetByteContext g; | |
55 | int buf_size = avpkt->size; | |
56 | BFIContext *bfi = avctx->priv_data; | |
57 | uint8_t *dst = bfi->dst; | |
58 | uint8_t *src, *dst_offset, colour1, colour2; | |
59 | uint8_t *frame_end = bfi->dst + avctx->width * avctx->height; | |
60 | uint32_t *pal; | |
61 | int i, j, ret, height = avctx->height; | |
62 | ||
63 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) | |
64 | return ret; | |
65 | ||
66 | bytestream2_init(&g, avpkt->data, buf_size); | |
67 | ||
68 | /* Set frame parameters and palette, if necessary */ | |
69 | if (!avctx->frame_number) { | |
70 | frame->pict_type = AV_PICTURE_TYPE_I; | |
71 | frame->key_frame = 1; | |
72 | /* Setting the palette */ | |
73 | if (avctx->extradata_size > 768) { | |
74 | av_log(NULL, AV_LOG_ERROR, "Palette is too large.\n"); | |
75 | return AVERROR_INVALIDDATA; | |
76 | } | |
77 | pal = (uint32_t *)frame->data[1]; | |
78 | for (i = 0; i < avctx->extradata_size / 3; i++) { | |
79 | int shift = 16; | |
80 | *pal = 0xFFU << 24; | |
81 | for (j = 0; j < 3; j++, shift -= 8) | |
82 | *pal += ((avctx->extradata[i * 3 + j] << 2) | | |
83 | (avctx->extradata[i * 3 + j] >> 4)) << shift; | |
84 | pal++; | |
85 | } | |
86 | memcpy(bfi->pal, frame->data[1], sizeof(bfi->pal)); | |
87 | frame->palette_has_changed = 1; | |
88 | } else { | |
89 | frame->pict_type = AV_PICTURE_TYPE_P; | |
90 | frame->key_frame = 0; | |
91 | frame->palette_has_changed = 0; | |
92 | memcpy(frame->data[1], bfi->pal, sizeof(bfi->pal)); | |
93 | } | |
94 | ||
95 | bytestream2_skip(&g, 4); // Unpacked size, not required. | |
96 | ||
97 | while (dst != frame_end) { | |
98 | static const uint8_t lentab[4] = { 0, 2, 0, 1 }; | |
99 | unsigned int byte = bytestream2_get_byte(&g), av_uninit(offset); | |
100 | unsigned int code = byte >> 6; | |
101 | unsigned int length = byte & ~0xC0; | |
102 | ||
103 | 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 | if (length == 0) { | |
111 | if (code == 1) { | |
112 | length = bytestream2_get_byte(&g); | |
113 | offset = bytestream2_get_le16(&g); | |
114 | } else { | |
115 | length = bytestream2_get_le16(&g); | |
116 | if (code == 2 && length == 0) | |
117 | break; | |
118 | } | |
119 | } else { | |
120 | if (code == 1) | |
121 | offset = bytestream2_get_byte(&g); | |
122 | } | |
123 | ||
124 | /* Do boundary check */ | |
125 | if (dst + (length << lentab[code]) > frame_end) | |
126 | break; | |
127 | ||
128 | switch (code) { | |
129 | case 0: // normal chain | |
130 | 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 | bytestream2_get_buffer(&g, dst, length); | |
135 | dst += length; | |
136 | break; | |
137 | case 1: // back chain | |
138 | dst_offset = dst - offset; | |
139 | length *= 4; // Convert dwords to bytes. | |
140 | if (dst_offset < bfi->dst) | |
141 | break; | |
142 | while (length--) | |
143 | *dst++ = *dst_offset++; | |
144 | break; | |
145 | case 2: // skip chain | |
146 | dst += length; | |
147 | break; | |
148 | case 3: // fill chain | |
149 | colour1 = bytestream2_get_byte(&g); | |
150 | colour2 = bytestream2_get_byte(&g); | |
151 | while (length--) { | |
152 | *dst++ = colour1; | |
153 | *dst++ = colour2; | |
154 | } | |
155 | break; | |
156 | } | |
157 | } | |
158 | ||
159 | src = bfi->dst; | |
160 | dst = frame->data[0]; | |
161 | while (height--) { | |
162 | memcpy(dst, src, avctx->width); | |
163 | src += avctx->width; | |
164 | dst += frame->linesize[0]; | |
165 | } | |
166 | *got_frame = 1; | |
167 | ||
168 | return buf_size; | |
169 | } | |
170 | ||
171 | static av_cold int bfi_decode_close(AVCodecContext *avctx) | |
172 | { | |
173 | BFIContext *bfi = avctx->priv_data; | |
f6fa7814 | 174 | av_freep(&bfi->dst); |
2ba45a60 DM |
175 | 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 = CODEC_CAP_DR1, | |
188 | }; |