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
destroy_buffers(CinVideoContext * cin)45 static av_cold void destroy_buffers(CinVideoContext *cin)
46 {
47 int i;
48
49 for (i = 0; i < 3; ++i)
50 av_freep(&cin->bitmap_table[i]);
51 }
52
allocate_buffers(CinVideoContext * cin)53 static av_cold int allocate_buffers(CinVideoContext *cin)
54 {
55 int i;
56
57 for (i = 0; i < 3; ++i) {
58 cin->bitmap_table[i] = av_mallocz(cin->bitmap_size);
59 if (!cin->bitmap_table[i]) {
60 av_log(cin->avctx, AV_LOG_ERROR, "Can't allocate bitmap buffers.\n");
61 destroy_buffers(cin);
62 return AVERROR(ENOMEM);
63 }
64 }
65
66 return 0;
67 }
68
cinvideo_decode_init(AVCodecContext * avctx)69 static av_cold int cinvideo_decode_init(AVCodecContext *avctx)
70 {
71 CinVideoContext *cin = avctx->priv_data;
72
73 cin->avctx = avctx;
74 avctx->pix_fmt = AV_PIX_FMT_PAL8;
75
76 cin->frame = av_frame_alloc();
77 if (!cin->frame)
78 return AVERROR(ENOMEM);
79
80 cin->bitmap_size = avctx->width * avctx->height;
81 if (allocate_buffers(cin))
82 return AVERROR(ENOMEM);
83
84 return 0;
85 }
86
cin_apply_delta_data(const unsigned char * src,unsigned char * dst,int size)87 static void cin_apply_delta_data(const unsigned char *src, unsigned char *dst,
88 int size)
89 {
90 while (size--)
91 *dst++ += *src++;
92 }
93
cin_decode_huffman(const unsigned char * src,int src_size,unsigned char * dst,int dst_size)94 static int cin_decode_huffman(const unsigned char *src, int src_size,
95 unsigned char *dst, int dst_size)
96 {
97 int b, huff_code = 0;
98 unsigned char huff_code_table[15];
99 unsigned char *dst_cur = dst;
100 unsigned char *dst_end = dst + dst_size;
101 const unsigned char *src_end = src + src_size;
102
103 memcpy(huff_code_table, src, 15);
104 src += 15;
105
106 while (src < src_end) {
107 huff_code = *src++;
108 if ((huff_code >> 4) == 15) {
109 b = huff_code << 4;
110 huff_code = *src++;
111 *dst_cur++ = b | (huff_code >> 4);
112 } else
113 *dst_cur++ = huff_code_table[huff_code >> 4];
114 if (dst_cur >= dst_end)
115 break;
116
117 huff_code &= 15;
118 if (huff_code == 15) {
119 *dst_cur++ = *src++;
120 } else
121 *dst_cur++ = huff_code_table[huff_code];
122 if (dst_cur >= dst_end)
123 break;
124 }
125
126 return dst_cur - dst;
127 }
128
cin_decode_lzss(const unsigned char * src,int src_size,unsigned char * dst,int dst_size)129 static int cin_decode_lzss(const unsigned char *src, int src_size,
130 unsigned char *dst, int dst_size)
131 {
132 uint16_t cmd;
133 int i, sz, offset, code;
134 unsigned char *dst_end = dst + dst_size, *dst_start = dst;
135 const unsigned char *src_end = src + src_size;
136
137 while (src < src_end && dst < dst_end) {
138 code = *src++;
139 for (i = 0; i < 8 && src < src_end && dst < dst_end; ++i) {
140 if (code & (1 << i)) {
141 *dst++ = *src++;
142 } else {
143 cmd = AV_RL16(src);
144 src += 2;
145 offset = cmd >> 4;
146 if ((int)(dst - dst_start) < offset + 1)
147 return AVERROR_INVALIDDATA;
148 sz = (cmd & 0xF) + 2;
149 /* don't use memcpy/memmove here as the decoding routine
150 * (ab)uses buffer overlappings to repeat bytes in the
151 * destination */
152 sz = FFMIN(sz, dst_end - dst);
153 while (sz--) {
154 *dst = *(dst - offset - 1);
155 ++dst;
156 }
157 }
158 }
159 }
160
161 if (dst_end - dst > dst_size - dst_size/10)
162 return AVERROR_INVALIDDATA;
163
164 return 0;
165 }
166
cin_decode_rle(const unsigned char * src,int src_size,unsigned char * dst,int dst_size)167 static int cin_decode_rle(const unsigned char *src, int src_size,
168 unsigned char *dst, int dst_size)
169 {
170 int len, code;
171 unsigned char *dst_end = dst + dst_size;
172 const unsigned char *src_end = src + src_size;
173
174 while (src + 1 < src_end && dst < dst_end) {
175 code = *src++;
176 if (code & 0x80) {
177 len = code - 0x7F;
178 memset(dst, *src++, FFMIN(len, dst_end - dst));
179 } else {
180 len = code + 1;
181 if (len > src_end-src) {
182 av_log(NULL, AV_LOG_ERROR, "RLE overread\n");
183 return AVERROR_INVALIDDATA;
184 }
185 memcpy(dst, src, FFMIN3(len, dst_end - dst, src_end - src));
186 src += len;
187 }
188 dst += len;
189 }
190
191 if (dst_end - dst > dst_size - dst_size/10)
192 return AVERROR_INVALIDDATA;
193
194 return 0;
195 }
196
cinvideo_decode_frame(AVCodecContext * avctx,void * data,int * got_frame,AVPacket * avpkt)197 static int cinvideo_decode_frame(AVCodecContext *avctx,
198 void *data, int *got_frame,
199 AVPacket *avpkt)
200 {
201 const uint8_t *buf = avpkt->data;
202 int buf_size = avpkt->size;
203 CinVideoContext *cin = avctx->priv_data;
204 int i, y, palette_type, palette_colors_count,
205 bitmap_frame_type, bitmap_frame_size, res = 0;
206
207 palette_type = buf[0];
208 palette_colors_count = AV_RL16(buf + 1);
209 bitmap_frame_type = buf[3];
210 buf += 4;
211
212 bitmap_frame_size = buf_size - 4;
213
214 /* handle palette */
215 if (bitmap_frame_size < palette_colors_count * (3 + (palette_type != 0)))
216 return AVERROR_INVALIDDATA;
217 if (palette_type == 0) {
218 if (palette_colors_count > 256)
219 return AVERROR_INVALIDDATA;
220 for (i = 0; i < palette_colors_count; ++i) {
221 cin->palette[i] = 0xFFU << 24 | bytestream_get_le24(&buf);
222 bitmap_frame_size -= 3;
223 }
224 } else {
225 for (i = 0; i < palette_colors_count; ++i) {
226 cin->palette[buf[0]] = 0xFFU << 24 | AV_RL24(buf + 1);
227 buf += 4;
228 bitmap_frame_size -= 4;
229 }
230 }
231
232 /* note: the decoding routines below assumes that
233 * surface.width = surface.pitch */
234 switch (bitmap_frame_type) {
235 case 9:
236 res = cin_decode_rle(buf, bitmap_frame_size,
237 cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
238 if (res < 0)
239 return res;
240 break;
241 case 34:
242 res = cin_decode_rle(buf, bitmap_frame_size,
243 cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
244 if (res < 0)
245 return res;
246 cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
247 cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
248 break;
249 case 35:
250 bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size,
251 cin->bitmap_table[CIN_INT_BMP], cin->bitmap_size);
252 res = cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
253 cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
254 if (res < 0)
255 return res;
256 break;
257 case 36:
258 bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size,
259 cin->bitmap_table[CIN_INT_BMP],
260 cin->bitmap_size);
261 res = cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
262 cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
263 if (res < 0)
264 return res;
265 cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
266 cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
267 break;
268 case 37:
269 res = cin_decode_huffman(buf, bitmap_frame_size,
270 cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
271
272 if (cin->bitmap_size - avctx->discard_damaged_percentage*cin->bitmap_size/100 > res)
273 return AVERROR_INVALIDDATA;
274 break;
275 case 38:
276 res = cin_decode_lzss(buf, bitmap_frame_size,
277 cin->bitmap_table[CIN_CUR_BMP],
278 cin->bitmap_size);
279 if (res < 0)
280 return res;
281 break;
282 case 39:
283 res = cin_decode_lzss(buf, bitmap_frame_size,
284 cin->bitmap_table[CIN_CUR_BMP],
285 cin->bitmap_size);
286 if (res < 0)
287 return res;
288 cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
289 cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
290 break;
291 }
292
293 if ((res = ff_reget_buffer(avctx, cin->frame, 0)) < 0)
294 return res;
295
296 memcpy(cin->frame->data[1], cin->palette, sizeof(cin->palette));
297 cin->frame->palette_has_changed = 1;
298 for (y = 0; y < cin->avctx->height; ++y)
299 memcpy(cin->frame->data[0] + (cin->avctx->height - 1 - y) * cin->frame->linesize[0],
300 cin->bitmap_table[CIN_CUR_BMP] + y * cin->avctx->width,
301 cin->avctx->width);
302
303 FFSWAP(uint8_t *, cin->bitmap_table[CIN_CUR_BMP],
304 cin->bitmap_table[CIN_PRE_BMP]);
305
306 if ((res = av_frame_ref(data, cin->frame)) < 0)
307 return res;
308
309 *got_frame = 1;
310
311 return buf_size;
312 }
313
cinvideo_decode_end(AVCodecContext * avctx)314 static av_cold int cinvideo_decode_end(AVCodecContext *avctx)
315 {
316 CinVideoContext *cin = avctx->priv_data;
317
318 av_frame_free(&cin->frame);
319
320 destroy_buffers(cin);
321
322 return 0;
323 }
324
325 AVCodec ff_dsicinvideo_decoder = {
326 .name = "dsicinvideo",
327 .long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN video"),
328 .type = AVMEDIA_TYPE_VIDEO,
329 .id = AV_CODEC_ID_DSICINVIDEO,
330 .priv_data_size = sizeof(CinVideoContext),
331 .init = cinvideo_decode_init,
332 .close = cinvideo_decode_end,
333 .decode = cinvideo_decode_frame,
334 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
335 .capabilities = AV_CODEC_CAP_DR1,
336 };
337