lavc: use designated initialisers for all codecs.
[libav.git] / libavcodec / dfa.c
1 /*
2 * Chronomaster DFA Video Decoder
3 * Copyright (c) 2011 Konstantin Shishkov
4 * based on work by Vladimir "VAG" Gneushev
5 *
6 * This file is part of Libav.
7 *
8 * Libav is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * Libav is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #include "avcodec.h"
24 #include "libavutil/intreadwrite.h"
25 #include "bytestream.h"
26 #include "libavutil/lzo.h" // for av_memcpy_backptr
27
28 typedef struct DfaContext {
29 AVFrame pic;
30
31 uint32_t pal[256];
32 uint8_t *frame_buf;
33 } DfaContext;
34
35 static av_cold int dfa_decode_init(AVCodecContext *avctx)
36 {
37 DfaContext *s = avctx->priv_data;
38
39 avctx->pix_fmt = PIX_FMT_PAL8;
40
41 s->frame_buf = av_mallocz(avctx->width * avctx->height + AV_LZO_OUTPUT_PADDING);
42 if (!s->frame_buf)
43 return AVERROR(ENOMEM);
44
45 return 0;
46 }
47
48 static int decode_copy(uint8_t *frame, int width, int height,
49 const uint8_t *src, const uint8_t *src_end)
50 {
51 const int size = width * height;
52
53 if (src_end - src < size)
54 return -1;
55 bytestream_get_buffer(&src, frame, size);
56 return 0;
57 }
58
59 static int decode_tsw1(uint8_t *frame, int width, int height,
60 const uint8_t *src, const uint8_t *src_end)
61 {
62 const uint8_t *frame_start = frame;
63 const uint8_t *frame_end = frame + width * height;
64 int mask = 0x10000, bitbuf = 0;
65 int v, count, segments;
66 unsigned offset;
67
68 segments = bytestream_get_le32(&src);
69 offset = bytestream_get_le32(&src);
70 if (frame_end - frame <= offset)
71 return -1;
72 frame += offset;
73 while (segments--) {
74 if (mask == 0x10000) {
75 if (src >= src_end)
76 return -1;
77 bitbuf = bytestream_get_le16(&src);
78 mask = 1;
79 }
80 if (src_end - src < 2 || frame_end - frame < 2)
81 return -1;
82 if (bitbuf & mask) {
83 v = bytestream_get_le16(&src);
84 offset = (v & 0x1FFF) << 1;
85 count = ((v >> 13) + 2) << 1;
86 if (frame - frame_start < offset || frame_end - frame < count)
87 return -1;
88 av_memcpy_backptr(frame, offset, count);
89 frame += count;
90 } else {
91 *frame++ = *src++;
92 *frame++ = *src++;
93 }
94 mask <<= 1;
95 }
96
97 return 0;
98 }
99
100 static int decode_dsw1(uint8_t *frame, int width, int height,
101 const uint8_t *src, const uint8_t *src_end)
102 {
103 const uint8_t *frame_start = frame;
104 const uint8_t *frame_end = frame + width * height;
105 int mask = 0x10000, bitbuf = 0;
106 int v, offset, count, segments;
107
108 segments = bytestream_get_le16(&src);
109 while (segments--) {
110 if (mask == 0x10000) {
111 if (src >= src_end)
112 return -1;
113 bitbuf = bytestream_get_le16(&src);
114 mask = 1;
115 }
116 if (src_end - src < 2 || frame_end - frame < 2)
117 return -1;
118 if (bitbuf & mask) {
119 v = bytestream_get_le16(&src);
120 offset = (v & 0x1FFF) << 1;
121 count = ((v >> 13) + 2) << 1;
122 if (frame - frame_start < offset || frame_end - frame < count)
123 return -1;
124 // can't use av_memcpy_backptr() since it can overwrite following pixels
125 for (v = 0; v < count; v++)
126 frame[v] = frame[v - offset];
127 frame += count;
128 } else if (bitbuf & (mask << 1)) {
129 frame += bytestream_get_le16(&src);
130 } else {
131 *frame++ = *src++;
132 *frame++ = *src++;
133 }
134 mask <<= 2;
135 }
136
137 return 0;
138 }
139
140 static int decode_dds1(uint8_t *frame, int width, int height,
141 const uint8_t *src, const uint8_t *src_end)
142 {
143 const uint8_t *frame_start = frame;
144 const uint8_t *frame_end = frame + width * height;
145 int mask = 0x10000, bitbuf = 0;
146 int i, v, offset, count, segments;
147
148 segments = bytestream_get_le16(&src);
149 while (segments--) {
150 if (mask == 0x10000) {
151 if (src >= src_end)
152 return -1;
153 bitbuf = bytestream_get_le16(&src);
154 mask = 1;
155 }
156 if (src_end - src < 2 || frame_end - frame < 2)
157 return -1;
158 if (bitbuf & mask) {
159 v = bytestream_get_le16(&src);
160 offset = (v & 0x1FFF) << 2;
161 count = ((v >> 13) + 2) << 1;
162 if (frame - frame_start < offset || frame_end - frame < count*2 + width)
163 return -1;
164 for (i = 0; i < count; i++) {
165 frame[0] = frame[1] =
166 frame[width] = frame[width + 1] = frame[-offset];
167
168 frame += 2;
169 }
170 } else if (bitbuf & (mask << 1)) {
171 frame += bytestream_get_le16(&src) * 2;
172 } else {
173 frame[0] = frame[1] =
174 frame[width] = frame[width + 1] = *src++;
175 frame += 2;
176 frame[0] = frame[1] =
177 frame[width] = frame[width + 1] = *src++;
178 frame += 2;
179 }
180 mask <<= 2;
181 }
182
183 return 0;
184 }
185
186 static int decode_bdlt(uint8_t *frame, int width, int height,
187 const uint8_t *src, const uint8_t *src_end)
188 {
189 uint8_t *line_ptr;
190 int count, lines, segments;
191
192 count = bytestream_get_le16(&src);
193 if (count >= height)
194 return -1;
195 frame += width * count;
196 lines = bytestream_get_le16(&src);
197 if (count + lines > height || src >= src_end)
198 return -1;
199
200 while (lines--) {
201 line_ptr = frame;
202 frame += width;
203 segments = *src++;
204 while (segments--) {
205 if (src_end - src < 3)
206 return -1;
207 if (frame - line_ptr <= *src)
208 return -1;
209 line_ptr += *src++;
210 count = (int8_t)*src++;
211 if (count >= 0) {
212 if (frame - line_ptr < count || src_end - src < count)
213 return -1;
214 bytestream_get_buffer(&src, line_ptr, count);
215 } else {
216 count = -count;
217 if (frame - line_ptr < count || src >= src_end)
218 return -1;
219 memset(line_ptr, *src++, count);
220 }
221 line_ptr += count;
222 }
223 }
224
225 return 0;
226 }
227
228 static int decode_wdlt(uint8_t *frame, int width, int height,
229 const uint8_t *src, const uint8_t *src_end)
230 {
231 const uint8_t *frame_end = frame + width * height;
232 uint8_t *line_ptr;
233 int count, i, v, lines, segments;
234
235 lines = bytestream_get_le16(&src);
236 if (lines > height || src >= src_end)
237 return -1;
238
239 while (lines--) {
240 segments = bytestream_get_le16(&src);
241 while ((segments & 0xC000) == 0xC000) {
242 unsigned delta = -((int16_t)segments * width);
243 if (frame_end - frame <= delta)
244 return -1;
245 frame += delta;
246 segments = bytestream_get_le16(&src);
247 }
248 if (segments & 0x8000) {
249 frame[width - 1] = segments & 0xFF;
250 segments = bytestream_get_le16(&src);
251 }
252 line_ptr = frame;
253 frame += width;
254 while (segments--) {
255 if (src_end - src < 2)
256 return -1;
257 if (frame - line_ptr <= *src)
258 return -1;
259 line_ptr += *src++;
260 count = (int8_t)*src++;
261 if (count >= 0) {
262 if (frame - line_ptr < count*2 || src_end - src < count*2)
263 return -1;
264 bytestream_get_buffer(&src, line_ptr, count*2);
265 line_ptr += count * 2;
266 } else {
267 count = -count;
268 if (frame - line_ptr < count*2 || src_end - src < 2)
269 return -1;
270 v = bytestream_get_le16(&src);
271 for (i = 0; i < count; i++)
272 bytestream_put_le16(&line_ptr, v);
273 }
274 }
275 }
276
277 return 0;
278 }
279
280 static int decode_unk6(uint8_t *frame, int width, int height,
281 const uint8_t *src, const uint8_t *src_end)
282 {
283 return -1;
284 }
285
286 static int decode_blck(uint8_t *frame, int width, int height,
287 const uint8_t *src, const uint8_t *src_end)
288 {
289 memset(frame, 0, width * height);
290 return 0;
291 }
292
293
294 typedef int (*chunk_decoder)(uint8_t *frame, int width, int height,
295 const uint8_t *src, const uint8_t *src_end);
296
297 static const chunk_decoder decoder[8] = {
298 decode_copy, decode_tsw1, decode_bdlt, decode_wdlt,
299 decode_unk6, decode_dsw1, decode_blck, decode_dds1,
300 };
301
302 static const char* chunk_name[8] = {
303 "COPY", "TSW1", "BDLT", "WDLT", "????", "DSW1", "BLCK", "DDS1"
304 };
305
306 static int dfa_decode_frame(AVCodecContext *avctx,
307 void *data, int *data_size,
308 AVPacket *avpkt)
309 {
310 DfaContext *s = avctx->priv_data;
311 const uint8_t *buf = avpkt->data;
312 const uint8_t *buf_end = avpkt->data + avpkt->size;
313 const uint8_t *tmp_buf;
314 uint32_t chunk_type, chunk_size;
315 uint8_t *dst;
316 int ret;
317 int i, pal_elems;
318
319 if (s->pic.data[0])
320 avctx->release_buffer(avctx, &s->pic);
321
322 if ((ret = avctx->get_buffer(avctx, &s->pic))) {
323 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
324 return ret;
325 }
326
327 while (buf < buf_end) {
328 chunk_size = AV_RL32(buf + 4);
329 chunk_type = AV_RL32(buf + 8);
330 buf += 12;
331 if (buf_end - buf < chunk_size) {
332 av_log(avctx, AV_LOG_ERROR, "Chunk size is too big (%d bytes)\n", chunk_size);
333 return -1;
334 }
335 if (!chunk_type)
336 break;
337 if (chunk_type == 1) {
338 pal_elems = FFMIN(chunk_size / 3, 256);
339 tmp_buf = buf;
340 for (i = 0; i < pal_elems; i++) {
341 s->pal[i] = bytestream_get_be24(&tmp_buf) << 2;
342 s->pal[i] |= (s->pal[i] >> 6) & 0x333;
343 }
344 s->pic.palette_has_changed = 1;
345 } else if (chunk_type <= 9) {
346 if (decoder[chunk_type - 2](s->frame_buf, avctx->width, avctx->height,
347 buf, buf + chunk_size)) {
348 av_log(avctx, AV_LOG_ERROR, "Error decoding %s chunk\n",
349 chunk_name[chunk_type - 2]);
350 return -1;
351 }
352 } else {
353 av_log(avctx, AV_LOG_WARNING, "Ignoring unknown chunk type %d\n",
354 chunk_type);
355 }
356 buf += chunk_size;
357 }
358
359 buf = s->frame_buf;
360 dst = s->pic.data[0];
361 for (i = 0; i < avctx->height; i++) {
362 memcpy(dst, buf, avctx->width);
363 dst += s->pic.linesize[0];
364 buf += avctx->width;
365 }
366 memcpy(s->pic.data[1], s->pal, sizeof(s->pal));
367
368 *data_size = sizeof(AVFrame);
369 *(AVFrame*)data = s->pic;
370
371 return avpkt->size;
372 }
373
374 static av_cold int dfa_decode_end(AVCodecContext *avctx)
375 {
376 DfaContext *s = avctx->priv_data;
377
378 if (s->pic.data[0])
379 avctx->release_buffer(avctx, &s->pic);
380
381 av_freep(&s->frame_buf);
382
383 return 0;
384 }
385
386 AVCodec ff_dfa_decoder = {
387 .name = "dfa",
388 .type = AVMEDIA_TYPE_VIDEO,
389 .id = CODEC_ID_DFA,
390 .priv_data_size = sizeof(DfaContext),
391 .init = dfa_decode_init,
392 .close = dfa_decode_end,
393 .decode = dfa_decode_frame,
394 .capabilities = CODEC_CAP_DR1,
395 .long_name = NULL_IF_CONFIG_SMALL("Chronomaster DFA"),
396 };