FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/bfi.c
Date: 2024-06-18 16:06:53
Exec Total Coverage
Lines: 82 93 88.2%
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 #if FF_API_PALETTE_HAS_CHANGED
87 FF_DISABLE_DEPRECATION_WARNINGS
88 1 frame->palette_has_changed = 1;
89 FF_ENABLE_DEPRECATION_WARNINGS
90 #endif
91 } else {
92 56 frame->pict_type = AV_PICTURE_TYPE_P;
93 56 frame->flags &= ~AV_FRAME_FLAG_KEY;
94 #if FF_API_PALETTE_HAS_CHANGED
95 FF_DISABLE_DEPRECATION_WARNINGS
96 56 frame->palette_has_changed = 0;
97 FF_ENABLE_DEPRECATION_WARNINGS
98 #endif
99 56 memcpy(frame->data[1], bfi->pal, sizeof(bfi->pal));
100 }
101
102 57 bytestream2_skip(&g, 4); // Unpacked size, not required.
103
104
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319642 while (dst != frame_end) {
105 static const uint8_t lentab[4] = { 0, 2, 0, 1 };
106 319585 unsigned int byte = bytestream2_get_byte(&g), av_uninit(offset);
107 319585 unsigned int code = byte >> 6;
108 319585 unsigned int length = byte & ~0xC0;
109
110
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319585 if (!bytestream2_get_bytes_left(&g)) {
111 av_log(avctx, AV_LOG_ERROR,
112 "Input resolution larger than actual frame.\n");
113 return AVERROR_INVALIDDATA;
114 }
115
116 /* Get length and offset (if required) */
117
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319585 if (length == 0) {
118
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46045 if (code == 1) {
119 44996 length = bytestream2_get_byte(&g);
120 44996 offset = bytestream2_get_le16(&g);
121 } else {
122 1049 length = bytestream2_get_le16(&g);
123
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1049 if (code == 2 && length == 0)
124 break;
125 }
126 } else {
127
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273540 if (code == 1)
128 7005 offset = bytestream2_get_byte(&g);
129 }
130
131 /* Do boundary check */
132
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319585 if (dst + (length << lentab[code]) > frame_end)
133 break;
134
135
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319585 switch (code) {
136 124968 case 0: // normal chain
137
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124968 if (length >= bytestream2_get_bytes_left(&g)) {
138 av_log(avctx, AV_LOG_ERROR, "Frame larger than buffer.\n");
139 return AVERROR_INVALIDDATA;
140 }
141 124968 bytestream2_get_buffer(&g, dst, length);
142 124968 dst += length;
143 124968 break;
144 52001 case 1: // back chain
145 52001 dst_offset = dst - offset;
146 52001 length *= 4; // Convert dwords to bytes.
147
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52001 if (dst_offset < bfi->dst)
148 break;
149
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871277 while (length--)
150 819276 *dst++ = *dst_offset++;
151 52001 break;
152 133856 case 2: // skip chain
153 133856 dst += length;
154 133856 break;
155 8760 case 3: // fill chain
156 8760 colour1 = bytestream2_get_byte(&g);
157 8760 colour2 = bytestream2_get_byte(&g);
158
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44349 while (length--) {
159 35589 *dst++ = colour1;
160 35589 *dst++ = colour2;
161 }
162 8760 break;
163 }
164 }
165
166 57 src = bfi->dst;
167 57 dst = frame->data[0];
168
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8037 while (height--) {
169 7980 memcpy(dst, src, avctx->width);
170 7980 src += avctx->width;
171 7980 dst += frame->linesize[0];
172 }
173 57 *got_frame = 1;
174
175 57 return buf_size;
176 }
177
178 2 static av_cold int bfi_decode_close(AVCodecContext *avctx)
179 {
180 2 BFIContext *bfi = avctx->priv_data;
181 2 av_freep(&bfi->dst);
182 2 return 0;
183 }
184
185 const FFCodec ff_bfi_decoder = {
186 .p.name = "bfi",
187 CODEC_LONG_NAME("Brute Force & Ignorance"),
188 .p.type = AVMEDIA_TYPE_VIDEO,
189 .p.id = AV_CODEC_ID_BFI,
190 .priv_data_size = sizeof(BFIContext),
191 .init = bfi_decode_init,
192 .close = bfi_decode_close,
193 FF_CODEC_DECODE_CB(bfi_decode_frame),
194 .p.capabilities = AV_CODEC_CAP_DR1,
195 };
196