blob: f95cbc74a07433aef1ab3eea1260e23e38fafca0
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 | 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 | |
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 | |
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 | |
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 | |
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 | |
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 | return 0; |
162 | } |
163 | |
164 | static int cin_decode_rle(const unsigned char *src, int src_size, |
165 | unsigned char *dst, int dst_size) |
166 | { |
167 | int len, code; |
168 | unsigned char *dst_end = dst + dst_size; |
169 | const unsigned char *src_end = src + src_size; |
170 | |
171 | while (src + 1 < src_end && dst < dst_end) { |
172 | code = *src++; |
173 | if (code & 0x80) { |
174 | len = code - 0x7F; |
175 | memset(dst, *src++, FFMIN(len, dst_end - dst)); |
176 | } else { |
177 | len = code + 1; |
178 | if (len > src_end-src) { |
179 | av_log(NULL, AV_LOG_ERROR, "RLE overread\n"); |
180 | return AVERROR_INVALIDDATA; |
181 | } |
182 | memcpy(dst, src, FFMIN3(len, dst_end - dst, src_end - src)); |
183 | src += len; |
184 | } |
185 | dst += len; |
186 | } |
187 | return 0; |
188 | } |
189 | |
190 | static int cinvideo_decode_frame(AVCodecContext *avctx, |
191 | void *data, int *got_frame, |
192 | AVPacket *avpkt) |
193 | { |
194 | const uint8_t *buf = avpkt->data; |
195 | int buf_size = avpkt->size; |
196 | CinVideoContext *cin = avctx->priv_data; |
197 | int i, y, palette_type, palette_colors_count, |
198 | bitmap_frame_type, bitmap_frame_size, res = 0; |
199 | |
200 | palette_type = buf[0]; |
201 | palette_colors_count = AV_RL16(buf + 1); |
202 | bitmap_frame_type = buf[3]; |
203 | buf += 4; |
204 | |
205 | bitmap_frame_size = buf_size - 4; |
206 | |
207 | /* handle palette */ |
208 | if (bitmap_frame_size < palette_colors_count * (3 + (palette_type != 0))) |
209 | return AVERROR_INVALIDDATA; |
210 | if (palette_type == 0) { |
211 | if (palette_colors_count > 256) |
212 | return AVERROR_INVALIDDATA; |
213 | for (i = 0; i < palette_colors_count; ++i) { |
214 | cin->palette[i] = 0xFFU << 24 | bytestream_get_le24(&buf); |
215 | bitmap_frame_size -= 3; |
216 | } |
217 | } else { |
218 | for (i = 0; i < palette_colors_count; ++i) { |
219 | cin->palette[buf[0]] = 0xFFU << 24 | AV_RL24(buf + 1); |
220 | buf += 4; |
221 | bitmap_frame_size -= 4; |
222 | } |
223 | } |
224 | |
225 | /* note: the decoding routines below assumes that |
226 | * surface.width = surface.pitch */ |
227 | switch (bitmap_frame_type) { |
228 | case 9: |
229 | cin_decode_rle(buf, bitmap_frame_size, |
230 | cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size); |
231 | break; |
232 | case 34: |
233 | cin_decode_rle(buf, bitmap_frame_size, |
234 | cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size); |
235 | cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP], |
236 | cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size); |
237 | break; |
238 | case 35: |
239 | bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size, |
240 | cin->bitmap_table[CIN_INT_BMP], cin->bitmap_size); |
241 | cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size, |
242 | cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size); |
243 | break; |
244 | case 36: |
245 | bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size, |
246 | cin->bitmap_table[CIN_INT_BMP], |
247 | cin->bitmap_size); |
248 | cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size, |
249 | cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size); |
250 | cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP], |
251 | cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size); |
252 | break; |
253 | case 37: |
254 | cin_decode_huffman(buf, bitmap_frame_size, |
255 | cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size); |
256 | break; |
257 | case 38: |
258 | res = cin_decode_lzss(buf, bitmap_frame_size, |
259 | cin->bitmap_table[CIN_CUR_BMP], |
260 | cin->bitmap_size); |
261 | if (res < 0) |
262 | return res; |
263 | break; |
264 | case 39: |
265 | res = cin_decode_lzss(buf, bitmap_frame_size, |
266 | cin->bitmap_table[CIN_CUR_BMP], |
267 | cin->bitmap_size); |
268 | if (res < 0) |
269 | return res; |
270 | cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP], |
271 | cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size); |
272 | break; |
273 | } |
274 | |
275 | if ((res = ff_reget_buffer(avctx, cin->frame)) < 0) |
276 | return res; |
277 | |
278 | memcpy(cin->frame->data[1], cin->palette, sizeof(cin->palette)); |
279 | cin->frame->palette_has_changed = 1; |
280 | for (y = 0; y < cin->avctx->height; ++y) |
281 | memcpy(cin->frame->data[0] + (cin->avctx->height - 1 - y) * cin->frame->linesize[0], |
282 | cin->bitmap_table[CIN_CUR_BMP] + y * cin->avctx->width, |
283 | cin->avctx->width); |
284 | |
285 | FFSWAP(uint8_t *, cin->bitmap_table[CIN_CUR_BMP], |
286 | cin->bitmap_table[CIN_PRE_BMP]); |
287 | |
288 | if ((res = av_frame_ref(data, cin->frame)) < 0) |
289 | return res; |
290 | |
291 | *got_frame = 1; |
292 | |
293 | return buf_size; |
294 | } |
295 | |
296 | static av_cold int cinvideo_decode_end(AVCodecContext *avctx) |
297 | { |
298 | CinVideoContext *cin = avctx->priv_data; |
299 | |
300 | av_frame_free(&cin->frame); |
301 | |
302 | destroy_buffers(cin); |
303 | |
304 | return 0; |
305 | } |
306 | |
307 | AVCodec ff_dsicinvideo_decoder = { |
308 | .name = "dsicinvideo", |
309 | .long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN video"), |
310 | .type = AVMEDIA_TYPE_VIDEO, |
311 | .id = AV_CODEC_ID_DSICINVIDEO, |
312 | .priv_data_size = sizeof(CinVideoContext), |
313 | .init = cinvideo_decode_init, |
314 | .close = cinvideo_decode_end, |
315 | .decode = cinvideo_decode_frame, |
316 | .capabilities = AV_CODEC_CAP_DR1, |
317 | }; |
318 |