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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 "codec_internal.h" | ||
33 | #include "decode.h" | ||
34 | |||
35 | typedef struct BFIContext { | ||
36 | AVCodecContext *avctx; | ||
37 | uint8_t *dst; | ||
38 | uint32_t pal[256]; | ||
39 | } BFIContext; | ||
40 | |||
41 | 2 | static av_cold int bfi_decode_init(AVCodecContext *avctx) | |
42 | { | ||
43 | 2 | BFIContext *bfi = avctx->priv_data; | |
44 | 2 | avctx->pix_fmt = AV_PIX_FMT_PAL8; | |
45 | 2 | bfi->dst = av_mallocz(avctx->width * avctx->height); | |
46 |
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2 | if (!bfi->dst) |
47 | ✗ | return AVERROR(ENOMEM); | |
48 | 2 | return 0; | |
49 | } | ||
50 | |||
51 | 57 | static int bfi_decode_frame(AVCodecContext *avctx, AVFrame *frame, | |
52 | int *got_frame, AVPacket *avpkt) | ||
53 | { | ||
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 |
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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 |
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57 | if (!avctx->frame_num) { |
70 | 1 | frame->pict_type = AV_PICTURE_TYPE_I; | |
71 | 1 | frame->flags |= AV_FRAME_FLAG_KEY; | |
72 | /* Setting the palette */ | ||
73 |
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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 |
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257 | for (i = 0; i < avctx->extradata_size / 3; i++) { |
79 | 256 | int shift = 16; | |
80 | 256 | *pal = 0xFFU << 24; | |
81 |
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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 | #if FF_API_PALETTE_HAS_CHANGED | ||
88 | FF_DISABLE_DEPRECATION_WARNINGS | ||
89 | 1 | frame->palette_has_changed = 1; | |
90 | FF_ENABLE_DEPRECATION_WARNINGS | ||
91 | #endif | ||
92 | } else { | ||
93 | 56 | frame->pict_type = AV_PICTURE_TYPE_P; | |
94 | 56 | frame->flags &= ~AV_FRAME_FLAG_KEY; | |
95 | #if FF_API_PALETTE_HAS_CHANGED | ||
96 | FF_DISABLE_DEPRECATION_WARNINGS | ||
97 | 56 | frame->palette_has_changed = 0; | |
98 | FF_ENABLE_DEPRECATION_WARNINGS | ||
99 | #endif | ||
100 | 56 | memcpy(frame->data[1], bfi->pal, sizeof(bfi->pal)); | |
101 | } | ||
102 | |||
103 | 57 | bytestream2_skip(&g, 4); // Unpacked size, not required. | |
104 | |||
105 |
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319642 | while (dst != frame_end) { |
106 | static const uint8_t lentab[4] = { 0, 2, 0, 1 }; | ||
107 | 319585 | unsigned int byte = bytestream2_get_byte(&g), av_uninit(offset); | |
108 | 319585 | unsigned int code = byte >> 6; | |
109 | 319585 | unsigned int length = byte & ~0xC0; | |
110 | |||
111 |
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319585 | if (!bytestream2_get_bytes_left(&g)) { |
112 | ✗ | av_log(avctx, AV_LOG_ERROR, | |
113 | "Input resolution larger than actual frame.\n"); | ||
114 | ✗ | return AVERROR_INVALIDDATA; | |
115 | } | ||
116 | |||
117 | /* Get length and offset (if required) */ | ||
118 |
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319585 | if (length == 0) { |
119 |
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46045 | if (code == 1) { |
120 | 44996 | length = bytestream2_get_byte(&g); | |
121 | 44996 | offset = bytestream2_get_le16(&g); | |
122 | } else { | ||
123 | 1049 | length = bytestream2_get_le16(&g); | |
124 |
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1049 | if (code == 2 && length == 0) |
125 | ✗ | break; | |
126 | } | ||
127 | } else { | ||
128 |
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273540 | if (code == 1) |
129 | 7005 | offset = bytestream2_get_byte(&g); | |
130 | } | ||
131 | |||
132 | /* Do boundary check */ | ||
133 |
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319585 | if (dst + (length << lentab[code]) > frame_end) |
134 | ✗ | break; | |
135 | |||
136 |
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319585 | switch (code) { |
137 | 124968 | case 0: // normal chain | |
138 |
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124968 | if (length >= bytestream2_get_bytes_left(&g)) { |
139 | ✗ | av_log(avctx, AV_LOG_ERROR, "Frame larger than buffer.\n"); | |
140 | ✗ | return AVERROR_INVALIDDATA; | |
141 | } | ||
142 | 124968 | bytestream2_get_buffer(&g, dst, length); | |
143 | 124968 | dst += length; | |
144 | 124968 | break; | |
145 | 52001 | case 1: // back chain | |
146 | 52001 | dst_offset = dst - offset; | |
147 | 52001 | length *= 4; // Convert dwords to bytes. | |
148 |
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52001 | if (dst_offset < bfi->dst) |
149 | ✗ | break; | |
150 |
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871277 | while (length--) |
151 | 819276 | *dst++ = *dst_offset++; | |
152 | 52001 | break; | |
153 | 133856 | case 2: // skip chain | |
154 | 133856 | dst += length; | |
155 | 133856 | break; | |
156 | 8760 | case 3: // fill chain | |
157 | 8760 | colour1 = bytestream2_get_byte(&g); | |
158 | 8760 | colour2 = bytestream2_get_byte(&g); | |
159 |
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44349 | while (length--) { |
160 | 35589 | *dst++ = colour1; | |
161 | 35589 | *dst++ = colour2; | |
162 | } | ||
163 | 8760 | break; | |
164 | } | ||
165 | } | ||
166 | |||
167 | 57 | src = bfi->dst; | |
168 | 57 | dst = frame->data[0]; | |
169 |
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8037 | while (height--) { |
170 | 7980 | memcpy(dst, src, avctx->width); | |
171 | 7980 | src += avctx->width; | |
172 | 7980 | dst += frame->linesize[0]; | |
173 | } | ||
174 | 57 | *got_frame = 1; | |
175 | |||
176 | 57 | return buf_size; | |
177 | } | ||
178 | |||
179 | 2 | static av_cold int bfi_decode_close(AVCodecContext *avctx) | |
180 | { | ||
181 | 2 | BFIContext *bfi = avctx->priv_data; | |
182 | 2 | av_freep(&bfi->dst); | |
183 | 2 | return 0; | |
184 | } | ||
185 | |||
186 | const FFCodec ff_bfi_decoder = { | ||
187 | .p.name = "bfi", | ||
188 | CODEC_LONG_NAME("Brute Force & Ignorance"), | ||
189 | .p.type = AVMEDIA_TYPE_VIDEO, | ||
190 | .p.id = AV_CODEC_ID_BFI, | ||
191 | .priv_data_size = sizeof(BFIContext), | ||
192 | .init = bfi_decode_init, | ||
193 | .close = bfi_decode_close, | ||
194 | FF_CODEC_DECODE_CB(bfi_decode_frame), | ||
195 | .p.capabilities = AV_CODEC_CAP_DR1, | ||
196 | }; | ||
197 |