Commit | Line | Data |
---|---|---|
2ba45a60 DM |
1 | /* |
2 | * Packed Animation File video decoder | |
3 | * Copyright (c) 2012 Paul B Mahol | |
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 | #include "libavutil/imgutils.h" | |
23 | ||
24 | #include "avcodec.h" | |
25 | #include "bytestream.h" | |
26 | #include "copy_block.h" | |
27 | #include "internal.h" | |
28 | ||
29 | ||
30 | static const uint8_t block_sequences[16][8] = { | |
31 | { 0, 0, 0, 0, 0, 0, 0, 0 }, | |
32 | { 2, 0, 0, 0, 0, 0, 0, 0 }, | |
33 | { 5, 7, 0, 0, 0, 0, 0, 0 }, | |
34 | { 5, 0, 0, 0, 0, 0, 0, 0 }, | |
35 | { 6, 0, 0, 0, 0, 0, 0, 0 }, | |
36 | { 5, 7, 5, 7, 0, 0, 0, 0 }, | |
37 | { 5, 7, 5, 0, 0, 0, 0, 0 }, | |
38 | { 5, 7, 6, 0, 0, 0, 0, 0 }, | |
39 | { 5, 5, 0, 0, 0, 0, 0, 0 }, | |
40 | { 3, 0, 0, 0, 0, 0, 0, 0 }, | |
41 | { 6, 6, 0, 0, 0, 0, 0, 0 }, | |
42 | { 2, 4, 0, 0, 0, 0, 0, 0 }, | |
43 | { 2, 4, 5, 7, 0, 0, 0, 0 }, | |
44 | { 2, 4, 5, 0, 0, 0, 0, 0 }, | |
45 | { 2, 4, 6, 0, 0, 0, 0, 0 }, | |
46 | { 2, 4, 5, 7, 5, 7, 0, 0 }, | |
47 | }; | |
48 | ||
49 | typedef struct PAFVideoDecContext { | |
50 | AVFrame *pic; | |
51 | GetByteContext gb; | |
52 | ||
53 | int width; | |
54 | int height; | |
55 | ||
56 | int current_frame; | |
57 | uint8_t *frame[4]; | |
58 | int frame_size; | |
59 | int video_size; | |
60 | ||
61 | uint8_t *opcodes; | |
62 | } PAFVideoDecContext; | |
63 | ||
64 | static av_cold int paf_video_close(AVCodecContext *avctx) | |
65 | { | |
66 | PAFVideoDecContext *c = avctx->priv_data; | |
67 | int i; | |
68 | ||
69 | av_frame_free(&c->pic); | |
70 | ||
71 | for (i = 0; i < 4; i++) | |
72 | av_freep(&c->frame[i]); | |
73 | ||
74 | return 0; | |
75 | } | |
76 | ||
77 | static av_cold int paf_video_init(AVCodecContext *avctx) | |
78 | { | |
79 | PAFVideoDecContext *c = avctx->priv_data; | |
80 | int i; | |
81 | ||
82 | c->width = avctx->width; | |
83 | c->height = avctx->height; | |
84 | ||
85 | if (avctx->height & 3 || avctx->width & 3) { | |
86 | av_log(avctx, AV_LOG_ERROR, | |
87 | "width %d and height %d must be multiplie of 4.\n", | |
88 | avctx->width, avctx->height); | |
89 | return AVERROR_INVALIDDATA; | |
90 | } | |
91 | ||
92 | avctx->pix_fmt = AV_PIX_FMT_PAL8; | |
93 | ||
94 | c->pic = av_frame_alloc(); | |
95 | if (!c->pic) | |
96 | return AVERROR(ENOMEM); | |
97 | ||
98 | c->frame_size = avctx->width * FFALIGN(avctx->height, 256); | |
99 | c->video_size = avctx->width * avctx->height; | |
100 | for (i = 0; i < 4; i++) { | |
101 | c->frame[i] = av_mallocz(c->frame_size); | |
102 | if (!c->frame[i]) { | |
103 | paf_video_close(avctx); | |
104 | return AVERROR(ENOMEM); | |
105 | } | |
106 | } | |
107 | ||
108 | return 0; | |
109 | } | |
110 | ||
111 | static void read4x4block(PAFVideoDecContext *c, uint8_t *dst, int width) | |
112 | { | |
113 | int i; | |
114 | ||
115 | for (i = 0; i < 4; i++) { | |
116 | bytestream2_get_buffer(&c->gb, dst, 4); | |
117 | dst += width; | |
118 | } | |
119 | } | |
120 | ||
121 | static void copy_color_mask(uint8_t *dst, int width, uint8_t mask, uint8_t color) | |
122 | { | |
123 | int i; | |
124 | ||
125 | for (i = 0; i < 4; i++) { | |
126 | if (mask & (1 << 7 - i)) | |
127 | dst[i] = color; | |
128 | if (mask & (1 << 3 - i)) | |
129 | dst[width + i] = color; | |
130 | } | |
131 | } | |
132 | ||
133 | static void copy_src_mask(uint8_t *dst, int width, uint8_t mask, const uint8_t *src) | |
134 | { | |
135 | int i; | |
136 | ||
137 | for (i = 0; i < 4; i++) { | |
138 | if (mask & (1 << 7 - i)) | |
139 | dst[i] = src[i]; | |
140 | if (mask & (1 << 3 - i)) | |
141 | dst[width + i] = src[width + i]; | |
142 | } | |
143 | } | |
144 | ||
145 | static void set_src_position(PAFVideoDecContext *c, | |
146 | const uint8_t **p, | |
147 | const uint8_t **pend) | |
148 | { | |
149 | int val = bytestream2_get_be16(&c->gb); | |
150 | int page = val >> 14; | |
151 | int x = (val & 0x7F); | |
152 | int y = ((val >> 7) & 0x7F); | |
153 | ||
154 | *p = c->frame[page] + x * 2 + y * 2 * c->width; | |
155 | *pend = c->frame[page] + c->frame_size; | |
156 | } | |
157 | ||
158 | static int decode_0(PAFVideoDecContext *c, uint8_t *pkt, uint8_t code) | |
159 | { | |
160 | uint32_t opcode_size, offset; | |
161 | uint8_t *dst, *dend, mask = 0, color = 0; | |
162 | const uint8_t *src, *send, *opcodes; | |
163 | int i, j, op = 0; | |
164 | ||
165 | i = bytestream2_get_byte(&c->gb); | |
166 | if (i) { | |
167 | if (code & 0x10) { | |
168 | int align; | |
169 | ||
170 | align = bytestream2_tell(&c->gb) & 3; | |
171 | if (align) | |
172 | bytestream2_skip(&c->gb, 4 - align); | |
173 | } | |
174 | do { | |
175 | int page, val, x, y; | |
176 | val = bytestream2_get_be16(&c->gb); | |
177 | page = val >> 14; | |
178 | x = (val & 0x7F) * 2; | |
179 | y = ((val >> 7) & 0x7F) * 2; | |
180 | dst = c->frame[page] + x + y * c->width; | |
181 | dend = c->frame[page] + c->frame_size; | |
182 | offset = (x & 0x7F) * 2; | |
183 | j = bytestream2_get_le16(&c->gb) + offset; | |
184 | do { | |
185 | offset++; | |
186 | if (dst + 3 * c->width + 4 > dend) | |
187 | return AVERROR_INVALIDDATA; | |
188 | read4x4block(c, dst, c->width); | |
189 | if ((offset & 0x3F) == 0) | |
190 | dst += c->width * 3; | |
191 | dst += 4; | |
192 | } while (offset < j); | |
193 | } while (--i); | |
194 | } | |
195 | ||
196 | dst = c->frame[c->current_frame]; | |
197 | dend = c->frame[c->current_frame] + c->frame_size; | |
198 | do { | |
199 | set_src_position(c, &src, &send); | |
200 | if ((src + 3 * c->width + 4 > send) || | |
201 | (dst + 3 * c->width + 4 > dend)) | |
202 | return AVERROR_INVALIDDATA; | |
203 | copy_block4(dst, src, c->width, c->width, 4); | |
204 | i++; | |
205 | if ((i & 0x3F) == 0) | |
206 | dst += c->width * 3; | |
207 | dst += 4; | |
208 | } while (i < c->video_size / 16); | |
209 | ||
210 | opcode_size = bytestream2_get_le16(&c->gb); | |
211 | bytestream2_skip(&c->gb, 2); | |
212 | ||
213 | if (bytestream2_get_bytes_left(&c->gb) < opcode_size) | |
214 | return AVERROR_INVALIDDATA; | |
215 | ||
216 | opcodes = pkt + bytestream2_tell(&c->gb); | |
217 | bytestream2_skipu(&c->gb, opcode_size); | |
218 | ||
219 | dst = c->frame[c->current_frame]; | |
220 | ||
221 | for (i = 0; i < c->height; i += 4, dst += c->width * 3) | |
222 | for (j = 0; j < c->width; j += 4, dst += 4) { | |
223 | int opcode, k = 0; | |
224 | if (op > opcode_size) | |
225 | return AVERROR_INVALIDDATA; | |
226 | if (j & 4) { | |
227 | opcode = opcodes[op] & 15; | |
228 | op++; | |
229 | } else { | |
230 | opcode = opcodes[op] >> 4; | |
231 | } | |
232 | ||
233 | while (block_sequences[opcode][k]) { | |
234 | offset = c->width * 2; | |
235 | code = block_sequences[opcode][k++]; | |
236 | ||
237 | switch (code) { | |
238 | case 2: | |
239 | offset = 0; | |
240 | case 3: | |
241 | color = bytestream2_get_byte(&c->gb); | |
242 | case 4: | |
243 | mask = bytestream2_get_byte(&c->gb); | |
244 | copy_color_mask(dst + offset, c->width, mask, color); | |
245 | break; | |
246 | case 5: | |
247 | offset = 0; | |
248 | case 6: | |
249 | set_src_position(c, &src, &send); | |
250 | case 7: | |
251 | if (src + offset + c->width + 4 > send) | |
252 | return AVERROR_INVALIDDATA; | |
253 | mask = bytestream2_get_byte(&c->gb); | |
254 | copy_src_mask(dst + offset, c->width, mask, src + offset); | |
255 | break; | |
256 | } | |
257 | } | |
258 | } | |
259 | ||
260 | return 0; | |
261 | } | |
262 | ||
263 | static int paf_video_decode(AVCodecContext *avctx, void *data, | |
264 | int *got_frame, AVPacket *pkt) | |
265 | { | |
266 | PAFVideoDecContext *c = avctx->priv_data; | |
267 | uint8_t code, *dst, *end; | |
268 | int i, frame, ret; | |
269 | ||
270 | if ((ret = ff_reget_buffer(avctx, c->pic)) < 0) | |
271 | return ret; | |
272 | ||
273 | bytestream2_init(&c->gb, pkt->data, pkt->size); | |
274 | ||
275 | code = bytestream2_get_byte(&c->gb); | |
276 | if (code & 0x20) { // frame is keyframe | |
277 | for (i = 0; i < 4; i++) | |
278 | memset(c->frame[i], 0, c->frame_size); | |
279 | ||
280 | memset(c->pic->data[1], 0, AVPALETTE_SIZE); | |
281 | c->current_frame = 0; | |
282 | c->pic->key_frame = 1; | |
283 | c->pic->pict_type = AV_PICTURE_TYPE_I; | |
284 | } else { | |
285 | c->pic->key_frame = 0; | |
286 | c->pic->pict_type = AV_PICTURE_TYPE_P; | |
287 | } | |
288 | ||
289 | if (code & 0x40) { // palette update | |
290 | uint32_t *out = (uint32_t *)c->pic->data[1]; | |
291 | int index, count; | |
292 | ||
293 | index = bytestream2_get_byte(&c->gb); | |
294 | count = bytestream2_get_byte(&c->gb) + 1; | |
295 | ||
296 | if (index + count > 256) | |
297 | return AVERROR_INVALIDDATA; | |
298 | if (bytestream2_get_bytes_left(&c->gb) < 3 * count) | |
299 | return AVERROR_INVALIDDATA; | |
300 | ||
301 | out += index; | |
302 | for (i = 0; i < count; i++) { | |
303 | unsigned r, g, b; | |
304 | ||
305 | r = bytestream2_get_byteu(&c->gb); | |
306 | r = r << 2 | r >> 4; | |
307 | g = bytestream2_get_byteu(&c->gb); | |
308 | g = g << 2 | g >> 4; | |
309 | b = bytestream2_get_byteu(&c->gb); | |
310 | b = b << 2 | b >> 4; | |
311 | *out++ = (0xFFU << 24) | (r << 16) | (g << 8) | b; | |
312 | } | |
313 | c->pic->palette_has_changed = 1; | |
314 | } | |
315 | ||
316 | switch (code & 0x0F) { | |
317 | case 0: | |
318 | /* Block-based motion compensation using 4x4 blocks with either | |
319 | * horizontal or vertical vectors; might incorporate VQ as well. */ | |
320 | if ((ret = decode_0(c, pkt->data, code)) < 0) | |
321 | return ret; | |
322 | break; | |
323 | case 1: | |
324 | /* Uncompressed data. This mode specifies that (width * height) bytes | |
325 | * should be copied directly from the encoded buffer into the output. */ | |
326 | dst = c->frame[c->current_frame]; | |
327 | // possibly chunk length data | |
328 | bytestream2_skip(&c->gb, 2); | |
329 | if (bytestream2_get_bytes_left(&c->gb) < c->video_size) | |
330 | return AVERROR_INVALIDDATA; | |
331 | bytestream2_get_bufferu(&c->gb, dst, c->video_size); | |
332 | break; | |
333 | case 2: | |
334 | /* Copy reference frame: Consume the next byte in the stream as the | |
335 | * reference frame (which should be 0, 1, 2, or 3, and should not be | |
336 | * the same as the current frame number). */ | |
337 | frame = bytestream2_get_byte(&c->gb); | |
338 | if (frame > 3) | |
339 | return AVERROR_INVALIDDATA; | |
340 | if (frame != c->current_frame) | |
341 | memcpy(c->frame[c->current_frame], c->frame[frame], c->frame_size); | |
342 | break; | |
343 | case 4: | |
344 | /* Run length encoding.*/ | |
345 | dst = c->frame[c->current_frame]; | |
346 | end = dst + c->video_size; | |
347 | ||
348 | bytestream2_skip(&c->gb, 2); | |
349 | ||
350 | while (dst < end) { | |
351 | int8_t code; | |
352 | int count; | |
353 | ||
354 | if (bytestream2_get_bytes_left(&c->gb) < 2) | |
355 | return AVERROR_INVALIDDATA; | |
356 | ||
357 | code = bytestream2_get_byteu(&c->gb); | |
358 | count = FFABS(code) + 1; | |
359 | ||
360 | if (dst + count > end) | |
361 | return AVERROR_INVALIDDATA; | |
362 | if (code < 0) | |
363 | memset(dst, bytestream2_get_byteu(&c->gb), count); | |
364 | else | |
365 | bytestream2_get_buffer(&c->gb, dst, count); | |
366 | dst += count; | |
367 | } | |
368 | break; | |
369 | default: | |
370 | avpriv_request_sample(avctx, "unknown/invalid code"); | |
371 | return AVERROR_INVALIDDATA; | |
372 | } | |
373 | ||
374 | av_image_copy_plane(c->pic->data[0], c->pic->linesize[0], | |
375 | c->frame[c->current_frame], c->width, | |
376 | c->width, c->height); | |
377 | ||
378 | c->current_frame = (c->current_frame + 1) & 3; | |
379 | if ((ret = av_frame_ref(data, c->pic)) < 0) | |
380 | return ret; | |
381 | ||
382 | *got_frame = 1; | |
383 | ||
384 | return pkt->size; | |
385 | } | |
386 | ||
387 | AVCodec ff_paf_video_decoder = { | |
388 | .name = "paf_video", | |
389 | .long_name = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File Video"), | |
390 | .type = AVMEDIA_TYPE_VIDEO, | |
391 | .id = AV_CODEC_ID_PAF_VIDEO, | |
392 | .priv_data_size = sizeof(PAFVideoDecContext), | |
393 | .init = paf_video_init, | |
394 | .close = paf_video_close, | |
395 | .decode = paf_video_decode, | |
396 | .capabilities = CODEC_CAP_DR1, | |
397 | }; |