ffmpeg / libavcodec / dfa.c @ 65daa942
History | View | Annotate | Download (11.7 KB)
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 FFmpeg.
|
7 |
*
|
8 |
* FFmpeg 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 |
* FFmpeg 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 FFmpeg; 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 |
const uint8_t *frame_end = frame + width * height;
|
190 |
uint8_t *line_ptr; |
191 |
int count, lines, segments;
|
192 |
|
193 |
count = bytestream_get_le16(&src); |
194 |
if (count >= height)
|
195 |
return -1; |
196 |
frame += width * count; |
197 |
lines = bytestream_get_le16(&src); |
198 |
if (count + lines > height || src >= src_end)
|
199 |
return -1; |
200 |
|
201 |
while (lines--) {
|
202 |
line_ptr = frame; |
203 |
frame += width; |
204 |
segments = *src++; |
205 |
while (segments--) {
|
206 |
if (src_end - src < 3) |
207 |
return -1; |
208 |
if (frame - line_ptr <= *src)
|
209 |
return -1; |
210 |
line_ptr += *src++; |
211 |
count = (int8_t)*src++; |
212 |
if (count >= 0) { |
213 |
if (frame - line_ptr < count || src_end - src < count)
|
214 |
return -1; |
215 |
bytestream_get_buffer(&src, line_ptr, count); |
216 |
} else {
|
217 |
count = -count; |
218 |
if (frame - line_ptr < count || src >= src_end)
|
219 |
return -1; |
220 |
memset(line_ptr, *src++, count); |
221 |
} |
222 |
line_ptr += count; |
223 |
} |
224 |
} |
225 |
|
226 |
return 0; |
227 |
} |
228 |
|
229 |
static int decode_wdlt(uint8_t *frame, int width, int height, |
230 |
const uint8_t *src, const uint8_t *src_end) |
231 |
{ |
232 |
const uint8_t *frame_end = frame + width * height;
|
233 |
uint8_t *line_ptr; |
234 |
int count, i, v, lines, segments;
|
235 |
|
236 |
lines = bytestream_get_le16(&src); |
237 |
if (lines > height || src >= src_end)
|
238 |
return -1; |
239 |
|
240 |
while (lines--) {
|
241 |
segments = bytestream_get_le16(&src); |
242 |
while ((segments & 0xC000) == 0xC000) { |
243 |
unsigned delta = -((int16_t)segments * width);
|
244 |
if (frame_end - frame <= delta)
|
245 |
return -1; |
246 |
frame += delta; |
247 |
segments = bytestream_get_le16(&src); |
248 |
} |
249 |
if (segments & 0x8000) { |
250 |
frame[width - 1] = segments & 0xFF; |
251 |
segments = bytestream_get_le16(&src); |
252 |
} |
253 |
line_ptr = frame; |
254 |
frame += width; |
255 |
while (segments--) {
|
256 |
if (src_end - src < 2) |
257 |
return -1; |
258 |
if (frame - line_ptr <= *src)
|
259 |
return -1; |
260 |
line_ptr += *src++; |
261 |
count = (int8_t)*src++; |
262 |
if (count >= 0) { |
263 |
if (frame - line_ptr < count*2 || src_end - src < count*2) |
264 |
return -1; |
265 |
bytestream_get_buffer(&src, line_ptr, count*2);
|
266 |
line_ptr += count * 2;
|
267 |
} else {
|
268 |
count = -count; |
269 |
if (frame - line_ptr < count*2 || src_end - src < 2) |
270 |
return -1; |
271 |
v = bytestream_get_le16(&src); |
272 |
for (i = 0; i < count; i++) |
273 |
bytestream_put_le16(&line_ptr, v); |
274 |
} |
275 |
} |
276 |
} |
277 |
|
278 |
return 0; |
279 |
} |
280 |
|
281 |
static int decode_unk6(uint8_t *frame, int width, int height, |
282 |
const uint8_t *src, const uint8_t *src_end) |
283 |
{ |
284 |
return -1; |
285 |
} |
286 |
|
287 |
static int decode_blck(uint8_t *frame, int width, int height, |
288 |
const uint8_t *src, const uint8_t *src_end) |
289 |
{ |
290 |
memset(frame, 0, width * height);
|
291 |
return 0; |
292 |
} |
293 |
|
294 |
|
295 |
typedef int (*chunk_decoder)(uint8_t *frame, int width, int height, |
296 |
const uint8_t *src, const uint8_t *src_end); |
297 |
|
298 |
static const chunk_decoder decoder[8] = { |
299 |
decode_copy, decode_tsw1, decode_bdlt, decode_wdlt, |
300 |
decode_unk6, decode_dsw1, decode_blck, decode_dds1, |
301 |
}; |
302 |
|
303 |
static const char* chunk_name[8] = { |
304 |
"COPY", "TSW1", "BDLT", "WDLT", "????", "DSW1", "BLCK", "DDS1" |
305 |
}; |
306 |
|
307 |
static int dfa_decode_frame(AVCodecContext *avctx, |
308 |
void *data, int *data_size, |
309 |
AVPacket *avpkt) |
310 |
{ |
311 |
DfaContext *s = avctx->priv_data; |
312 |
const uint8_t *buf = avpkt->data;
|
313 |
const uint8_t *buf_end = avpkt->data + avpkt->size;
|
314 |
const uint8_t *tmp_buf;
|
315 |
uint32_t chunk_type, chunk_size; |
316 |
uint8_t *dst; |
317 |
int ret;
|
318 |
int i, pal_elems;
|
319 |
|
320 |
if (s->pic.data[0]) |
321 |
avctx->release_buffer(avctx, &s->pic); |
322 |
|
323 |
if ((ret = avctx->get_buffer(avctx, &s->pic))) {
|
324 |
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
|
325 |
return ret;
|
326 |
} |
327 |
|
328 |
while (buf < buf_end) {
|
329 |
chunk_size = AV_RL32(buf + 4);
|
330 |
chunk_type = AV_RL32(buf + 8);
|
331 |
buf += 12;
|
332 |
if (buf_end - buf < chunk_size) {
|
333 |
av_log(avctx, AV_LOG_ERROR, "Chunk size is too big (%d bytes)\n", chunk_size);
|
334 |
return -1; |
335 |
} |
336 |
if (!chunk_type)
|
337 |
break;
|
338 |
if (chunk_type == 1) { |
339 |
pal_elems = FFMIN(chunk_size / 3, 256); |
340 |
tmp_buf = buf; |
341 |
for (i = 0; i < pal_elems; i++) { |
342 |
s->pal[i] = bytestream_get_be24(&tmp_buf) << 2;
|
343 |
s->pal[i] |= (s->pal[i] >> 6) & 0x333; |
344 |
} |
345 |
s->pic.palette_has_changed = 1;
|
346 |
} else if (chunk_type <= 9) { |
347 |
if (decoder[chunk_type - 2](s->frame_buf, avctx->width, avctx->height, |
348 |
buf, buf + chunk_size)) { |
349 |
av_log(avctx, AV_LOG_ERROR, "Error decoding %s chunk\n",
|
350 |
chunk_name[chunk_type - 2]);
|
351 |
return -1; |
352 |
} |
353 |
} else {
|
354 |
av_log(avctx, AV_LOG_WARNING, "Ignoring unknown chunk type %d\n",
|
355 |
chunk_type); |
356 |
} |
357 |
buf += chunk_size; |
358 |
} |
359 |
|
360 |
buf = s->frame_buf; |
361 |
dst = s->pic.data[0];
|
362 |
for (i = 0; i < avctx->height; i++) { |
363 |
memcpy(dst, buf, avctx->width); |
364 |
dst += s->pic.linesize[0];
|
365 |
buf += avctx->width; |
366 |
} |
367 |
memcpy(s->pic.data[1], s->pal, sizeof(s->pal)); |
368 |
|
369 |
*data_size = sizeof(AVFrame);
|
370 |
*(AVFrame*)data = s->pic; |
371 |
|
372 |
return avpkt->size;
|
373 |
} |
374 |
|
375 |
static av_cold int dfa_decode_end(AVCodecContext *avctx) |
376 |
{ |
377 |
DfaContext *s = avctx->priv_data; |
378 |
|
379 |
if (s->pic.data[0]) |
380 |
avctx->release_buffer(avctx, &s->pic); |
381 |
|
382 |
av_freep(&s->frame_buf); |
383 |
|
384 |
return 0; |
385 |
} |
386 |
|
387 |
AVCodec ff_dfa_decoder = { |
388 |
"dfa",
|
389 |
AVMEDIA_TYPE_VIDEO, |
390 |
CODEC_ID_DFA, |
391 |
sizeof(DfaContext),
|
392 |
dfa_decode_init, |
393 |
NULL,
|
394 |
dfa_decode_end, |
395 |
dfa_decode_frame, |
396 |
CODEC_CAP_DR1, |
397 |
.long_name = NULL_IF_CONFIG_SMALL("Chronomaster DFA"),
|
398 |
}; |