FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/dsicinvideo.c
Date: 2021-09-24 20:55:06
Exec Total Coverage
Lines: 88 184 47.8%
Branches: 37 90 41.1%

Line Branch Exec Source
1 /*
2 * Delphine Software International CIN video decoder
3 * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
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 * Delphine Software International CIN video decoder
25 */
26
27 #include "avcodec.h"
28 #include "bytestream.h"
29 #include "internal.h"
30
31 typedef enum CinVideoBitmapIndex {
32 CIN_CUR_BMP = 0, /* current */
33 CIN_PRE_BMP = 1, /* previous */
34 CIN_INT_BMP = 2 /* intermediate */
35 } CinVideoBitmapIndex;
36
37 typedef struct CinVideoContext {
38 AVCodecContext *avctx;
39 AVFrame *frame;
40 unsigned int bitmap_size;
41 uint32_t palette[256];
42 uint8_t *bitmap_table[3];
43 } CinVideoContext;
44
45 3 static av_cold void destroy_buffers(CinVideoContext *cin)
46 {
47 int i;
48
49
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12 for (i = 0; i < 3; ++i)
50 9 av_freep(&cin->bitmap_table[i]);
51 3 }
52
53 3 static av_cold int allocate_buffers(CinVideoContext *cin)
54 {
55 int i;
56
57
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12 for (i = 0; i < 3; ++i) {
58 9 cin->bitmap_table[i] = av_mallocz(cin->bitmap_size);
59
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9 if (!cin->bitmap_table[i]) {
60 av_log(cin->avctx, AV_LOG_ERROR, "Can't allocate bitmap buffers.\n");
61 return AVERROR(ENOMEM);
62 }
63 }
64
65 3 return 0;
66 }
67
68 3 static av_cold int cinvideo_decode_init(AVCodecContext *avctx)
69 {
70 3 CinVideoContext *cin = avctx->priv_data;
71
72 3 cin->avctx = avctx;
73 3 avctx->pix_fmt = AV_PIX_FMT_PAL8;
74
75 3 cin->frame = av_frame_alloc();
76
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3 if (!cin->frame)
77 return AVERROR(ENOMEM);
78
79 3 cin->bitmap_size = avctx->width * avctx->height;
80
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3 if (allocate_buffers(cin))
81 return AVERROR(ENOMEM);
82
83 3 return 0;
84 }
85
86 8 static void cin_apply_delta_data(const unsigned char *src, unsigned char *dst,
87 int size)
88 {
89
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409608 while (size--)
90 409600 *dst++ += *src++;
91 8 }
92
93 static int cin_decode_huffman(const unsigned char *src, int src_size,
94 unsigned char *dst, int dst_size)
95 {
96 int b, huff_code = 0;
97 unsigned char huff_code_table[15];
98 unsigned char *dst_cur = dst;
99 unsigned char *dst_end = dst + dst_size;
100 const unsigned char *src_end = src + src_size;
101
102 memcpy(huff_code_table, src, 15);
103 src += 15;
104
105 while (src < src_end) {
106 huff_code = *src++;
107 if ((huff_code >> 4) == 15) {
108 b = huff_code << 4;
109 huff_code = *src++;
110 *dst_cur++ = b | (huff_code >> 4);
111 } else
112 *dst_cur++ = huff_code_table[huff_code >> 4];
113 if (dst_cur >= dst_end)
114 break;
115
116 huff_code &= 15;
117 if (huff_code == 15) {
118 *dst_cur++ = *src++;
119 } else
120 *dst_cur++ = huff_code_table[huff_code];
121 if (dst_cur >= dst_end)
122 break;
123 }
124
125 return dst_cur - dst;
126 }
127
128 92 static int cin_decode_lzss(const unsigned char *src, int src_size,
129 unsigned char *dst, int dst_size)
130 {
131 uint16_t cmd;
132 int i, sz, offset, code;
133 92 unsigned char *dst_end = dst + dst_size, *dst_start = dst;
134 92 const unsigned char *src_end = src + src_size;
135
136
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49910 while (src < src_end && dst < dst_end) {
137 49818 code = *src++;
138
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448086 for (i = 0; i < 8 && src < src_end && dst < dst_end; ++i) {
139
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398268 if (code & (1 << i)) {
140 86707 *dst++ = *src++;
141 } else {
142 311561 cmd = AV_RL16(src);
143 311561 src += 2;
144 311561 offset = cmd >> 4;
145
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311561 if ((int)(dst - dst_start) < offset + 1)
146 return AVERROR_INVALIDDATA;
147 311561 sz = (cmd & 0xF) + 2;
148 /* don't use memcpy/memmove here as the decoding routine
149 * (ab)uses buffer overlappings to repeat bytes in the
150 * destination */
151 311561 sz = FFMIN(sz, dst_end - dst);
152
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4890008 while (sz--) {
153 4578447 *dst = *(dst - offset - 1);
154 4578447 ++dst;
155 }
156 }
157 }
158 }
159
160
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92 if (dst_end - dst > dst_size - dst_size/10)
161 return AVERROR_INVALIDDATA;
162
163 92 return 0;
164 }
165
166 static int cin_decode_rle(const unsigned char *src, int src_size,
167 unsigned char *dst, int dst_size)
168 {
169 int len, code;
170 unsigned char *dst_end = dst + dst_size;
171 const unsigned char *src_end = src + src_size;
172
173 while (src + 1 < src_end && dst < dst_end) {
174 code = *src++;
175 if (code & 0x80) {
176 len = code - 0x7F;
177 memset(dst, *src++, FFMIN(len, dst_end - dst));
178 } else {
179 len = code + 1;
180 if (len > src_end-src) {
181 av_log(NULL, AV_LOG_ERROR, "RLE overread\n");
182 return AVERROR_INVALIDDATA;
183 }
184 memcpy(dst, src, FFMIN3(len, dst_end - dst, src_end - src));
185 src += len;
186 }
187 dst += len;
188 }
189
190 if (dst_end - dst > dst_size - dst_size/10)
191 return AVERROR_INVALIDDATA;
192
193 return 0;
194 }
195
196 92 static int cinvideo_decode_frame(AVCodecContext *avctx,
197 void *data, int *got_frame,
198 AVPacket *avpkt)
199 {
200 92 const uint8_t *buf = avpkt->data;
201 92 int buf_size = avpkt->size;
202 92 CinVideoContext *cin = avctx->priv_data;
203 int i, y, palette_type, palette_colors_count,
204 92 bitmap_frame_type, bitmap_frame_size, res = 0;
205
206 92 palette_type = buf[0];
207 92 palette_colors_count = AV_RL16(buf + 1);
208 92 bitmap_frame_type = buf[3];
209 92 buf += 4;
210
211 92 bitmap_frame_size = buf_size - 4;
212
213 /* handle palette */
214
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92 if (bitmap_frame_size < palette_colors_count * (3 + (palette_type != 0)))
215 return AVERROR_INVALIDDATA;
216
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92 if (palette_type == 0) {
217
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92 if (palette_colors_count > 256)
218 return AVERROR_INVALIDDATA;
219
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11356 for (i = 0; i < palette_colors_count; ++i) {
220 11264 cin->palette[i] = 0xFFU << 24 | bytestream_get_le24(&buf);
221 11264 bitmap_frame_size -= 3;
222 }
223 } else {
224 for (i = 0; i < palette_colors_count; ++i) {
225 cin->palette[buf[0]] = 0xFFU << 24 | AV_RL24(buf + 1);
226 buf += 4;
227 bitmap_frame_size -= 4;
228 }
229 }
230
231 /* note: the decoding routines below assumes that
232 * surface.width = surface.pitch */
233
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92 switch (bitmap_frame_type) {
234 case 9:
235 res = cin_decode_rle(buf, bitmap_frame_size,
236 cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
237 if (res < 0)
238 return res;
239 break;
240 case 34:
241 res = cin_decode_rle(buf, bitmap_frame_size,
242 cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
243 if (res < 0)
244 return res;
245 cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
246 cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
247 break;
248 case 35:
249 bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size,
250 cin->bitmap_table[CIN_INT_BMP], cin->bitmap_size);
251 res = cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
252 cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
253 if (res < 0)
254 return res;
255 break;
256 case 36:
257 bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size,
258 cin->bitmap_table[CIN_INT_BMP],
259 cin->bitmap_size);
260 res = cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
261 cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
262 if (res < 0)
263 return res;
264 cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
265 cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
266 break;
267 case 37:
268 res = cin_decode_huffman(buf, bitmap_frame_size,
269 cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
270
271 if (cin->bitmap_size - avctx->discard_damaged_percentage*cin->bitmap_size/100 > res)
272 return AVERROR_INVALIDDATA;
273 break;
274 84 case 38:
275 84 res = cin_decode_lzss(buf, bitmap_frame_size,
276 84 cin->bitmap_table[CIN_CUR_BMP],
277 84 cin->bitmap_size);
278
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84 if (res < 0)
279 return res;
280 84 break;
281 8 case 39:
282 8 res = cin_decode_lzss(buf, bitmap_frame_size,
283 8 cin->bitmap_table[CIN_CUR_BMP],
284 8 cin->bitmap_size);
285
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8 if (res < 0)
286 return res;
287 8 cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
288 8 cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
289 8 break;
290 }
291
292
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92 if ((res = ff_reget_buffer(avctx, cin->frame, 0)) < 0)
293 return res;
294
295 92 memcpy(cin->frame->data[1], cin->palette, sizeof(cin->palette));
296 92 cin->frame->palette_has_changed = 1;
297
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14812 for (y = 0; y < cin->avctx->height; ++y)
298 14720 memcpy(cin->frame->data[0] + (cin->avctx->height - 1 - y) * cin->frame->linesize[0],
299 14720 cin->bitmap_table[CIN_CUR_BMP] + y * cin->avctx->width,
300 14720 cin->avctx->width);
301
302 92 FFSWAP(uint8_t *, cin->bitmap_table[CIN_CUR_BMP],
303 cin->bitmap_table[CIN_PRE_BMP]);
304
305
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92 if ((res = av_frame_ref(data, cin->frame)) < 0)
306 return res;
307
308 92 *got_frame = 1;
309
310 92 return buf_size;
311 }
312
313 3 static av_cold int cinvideo_decode_end(AVCodecContext *avctx)
314 {
315 3 CinVideoContext *cin = avctx->priv_data;
316
317 3 av_frame_free(&cin->frame);
318
319 3 destroy_buffers(cin);
320
321 3 return 0;
322 }
323
324 const AVCodec ff_dsicinvideo_decoder = {
325 .name = "dsicinvideo",
326 .long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN video"),
327 .type = AVMEDIA_TYPE_VIDEO,
328 .id = AV_CODEC_ID_DSICINVIDEO,
329 .priv_data_size = sizeof(CinVideoContext),
330 .init = cinvideo_decode_init,
331 .close = cinvideo_decode_end,
332 .decode = cinvideo_decode_frame,
333 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
334 .capabilities = AV_CODEC_CAP_DR1,
335 };
336