Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / dsicinvideo.c
CommitLineData
2ba45a60
DM
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
31typedef enum CinVideoBitmapIndex {
32 CIN_CUR_BMP = 0, /* current */
33 CIN_PRE_BMP = 1, /* previous */
34 CIN_INT_BMP = 2 /* intermediate */
35} CinVideoBitmapIndex;
36
37typedef 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
45static 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
53static 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
69static 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
87static void cin_apply_delta_data(const unsigned char *src, unsigned char *dst,
88 int size)
89{
90 while (size--)
91 *dst++ += *src++;
92}
93
94static 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
129static 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
164static 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
190static 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
296static 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
307AVCodec 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 = CODEC_CAP_DR1,
317};