FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/bfi.c
Date: 2025-04-22 22:59:17
Exec Total Coverage
Lines: 80 91 87.9%
Functions: 3 3 100.0%
Branches: 34 43 79.1%
Line Branch Exec Source
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/mem.h"
30 #include "avcodec.h"
31 #include "bytestream.h"
32 #include "codec_internal.h"
33 #include "decode.h"
34
35 typedef struct BFIContext {
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
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 2 if (!bfi->dst)
46 ✗ return AVERROR(ENOMEM);
47 2 return 0;
48 }
49
50 57 static int bfi_decode_frame(AVCodecContext *avctx, AVFrame *frame,
51 int *got_frame, AVPacket *avpkt)
52 {
53 GetByteContext g;
54 57 int buf_size = avpkt->size;
55 57 BFIContext *bfi = avctx->priv_data;
56 57 uint8_t *dst = bfi->dst;
57 uint8_t *src, *dst_offset, colour1, colour2;
58 57 uint8_t *frame_end = bfi->dst + avctx->width * avctx->height;
59 uint32_t *pal;
60 57 int i, j, ret, height = avctx->height;
61
62
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 57 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
63 ✗ return ret;
64
65 57 bytestream2_init(&g, avpkt->data, buf_size);
66
67 /* Set frame parameters and palette, if necessary */
68
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 57 if (!avctx->frame_num) {
69 1 frame->pict_type = AV_PICTURE_TYPE_I;
70 1 frame->flags |= AV_FRAME_FLAG_KEY;
71 /* Setting the palette */
72
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 1 if (avctx->extradata_size > 768) {
73 ✗ av_log(avctx, AV_LOG_ERROR, "Palette is too large.\n");
74 ✗ return AVERROR_INVALIDDATA;
75 }
76 1 pal = (uint32_t *)frame->data[1];
77
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 257 for (i = 0; i < avctx->extradata_size / 3; i++) {
78 256 int shift = 16;
79 256 *pal = 0xFFU << 24;
80
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 1024 for (j = 0; j < 3; j++, shift -= 8)
81 768 *pal += ((avctx->extradata[i * 3 + j] << 2) |
82 768 (avctx->extradata[i * 3 + j] >> 4)) << shift;
83 256 pal++;
84 }
85 1 memcpy(bfi->pal, frame->data[1], sizeof(bfi->pal));
86 } else {
87 56 frame->pict_type = AV_PICTURE_TYPE_P;
88 56 frame->flags &= ~AV_FRAME_FLAG_KEY;
89 56 memcpy(frame->data[1], bfi->pal, sizeof(bfi->pal));
90 }
91
92 57 bytestream2_skip(&g, 4); // Unpacked size, not required.
93
94
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 319642 while (dst != frame_end) {
95 static const uint8_t lentab[4] = { 0, 2, 0, 1 };
96 319585 unsigned int byte = bytestream2_get_byte(&g), av_uninit(offset);
97 319585 unsigned int code = byte >> 6;
98 319585 unsigned int length = byte & ~0xC0;
99
100
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 319585 if (!bytestream2_get_bytes_left(&g)) {
101 ✗ av_log(avctx, AV_LOG_ERROR,
102 "Input resolution larger than actual frame.\n");
103 ✗ return AVERROR_INVALIDDATA;
104 }
105
106 /* Get length and offset (if required) */
107
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 319585 if (length == 0) {
108
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 46045 if (code == 1) {
109 44996 length = bytestream2_get_byte(&g);
110 44996 offset = bytestream2_get_le16(&g);
111 } else {
112 1049 length = bytestream2_get_le16(&g);
113
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 1049 if (code == 2 && length == 0)
114 ✗ break;
115 }
116 } else {
117
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 273540 if (code == 1)
118 7005 offset = bytestream2_get_byte(&g);
119 }
120
121 /* Do boundary check */
122
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 319585 if (dst + (length << lentab[code]) > frame_end)
123 ✗ break;
124
125
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 319585 switch (code) {
126 124968 case 0: // normal chain
127
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 124968 if (length >= bytestream2_get_bytes_left(&g)) {
128 ✗ av_log(avctx, AV_LOG_ERROR, "Frame larger than buffer.\n");
129 ✗ return AVERROR_INVALIDDATA;
130 }
131 124968 bytestream2_get_buffer(&g, dst, length);
132 124968 dst += length;
133 124968 break;
134 52001 case 1: // back chain
135 52001 dst_offset = dst - offset;
136 52001 length *= 4; // Convert dwords to bytes.
137
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 52001 if (dst_offset < bfi->dst)
138 ✗ break;
139
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 871277 while (length--)
140 819276 *dst++ = *dst_offset++;
141 52001 break;
142 133856 case 2: // skip chain
143 133856 dst += length;
144 133856 break;
145 8760 case 3: // fill chain
146 8760 colour1 = bytestream2_get_byte(&g);
147 8760 colour2 = bytestream2_get_byte(&g);
148
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 44349 while (length--) {
149 35589 *dst++ = colour1;
150 35589 *dst++ = colour2;
151 }
152 8760 break;
153 }
154 }
155
156 57 src = bfi->dst;
157 57 dst = frame->data[0];
158
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 8037 while (height--) {
159 7980 memcpy(dst, src, avctx->width);
160 7980 src += avctx->width;
161 7980 dst += frame->linesize[0];
162 }
163 57 *got_frame = 1;
164
165 57 return buf_size;
166 }
167
168 2 static av_cold int bfi_decode_close(AVCodecContext *avctx)
169 {
170 2 BFIContext *bfi = avctx->priv_data;
171 2 av_freep(&bfi->dst);
172 2 return 0;
173 }
174
175 const FFCodec ff_bfi_decoder = {
176 .p.name = "bfi",
177 CODEC_LONG_NAME("Brute Force & Ignorance"),
178 .p.type = AVMEDIA_TYPE_VIDEO,
179 .p.id = AV_CODEC_ID_BFI,
180 .priv_data_size = sizeof(BFIContext),
181 .init = bfi_decode_init,
182 .close = bfi_decode_close,
183 FF_CODEC_DECODE_CB(bfi_decode_frame),
184 .p.capabilities = AV_CODEC_CAP_DR1,
185 };
186