Directory: | ../../../ffmpeg/ |
---|---|
File: | src/libavcodec/pafvideo.c |
Date: | 2022-07-04 00:18:54 |
Exec | Total | Coverage | |
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Lines: | 192 | 224 | 85.7% |
Branches: | 92 | 126 | 73.0% |
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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 "codec_internal.h" | ||
28 | #include "internal.h" | ||
29 | |||
30 | |||
31 | static const uint8_t block_sequences[16][8] = { | ||
32 | { 0, 0, 0, 0, 0, 0, 0, 0 }, | ||
33 | { 2, 0, 0, 0, 0, 0, 0, 0 }, | ||
34 | { 5, 7, 0, 0, 0, 0, 0, 0 }, | ||
35 | { 5, 0, 0, 0, 0, 0, 0, 0 }, | ||
36 | { 6, 0, 0, 0, 0, 0, 0, 0 }, | ||
37 | { 5, 7, 5, 7, 0, 0, 0, 0 }, | ||
38 | { 5, 7, 5, 0, 0, 0, 0, 0 }, | ||
39 | { 5, 7, 6, 0, 0, 0, 0, 0 }, | ||
40 | { 5, 5, 0, 0, 0, 0, 0, 0 }, | ||
41 | { 3, 0, 0, 0, 0, 0, 0, 0 }, | ||
42 | { 6, 6, 0, 0, 0, 0, 0, 0 }, | ||
43 | { 2, 4, 0, 0, 0, 0, 0, 0 }, | ||
44 | { 2, 4, 5, 7, 0, 0, 0, 0 }, | ||
45 | { 2, 4, 5, 0, 0, 0, 0, 0 }, | ||
46 | { 2, 4, 6, 0, 0, 0, 0, 0 }, | ||
47 | { 2, 4, 5, 7, 5, 7, 0, 0 }, | ||
48 | }; | ||
49 | |||
50 | typedef struct PAFVideoDecContext { | ||
51 | AVFrame *pic; | ||
52 | GetByteContext gb; | ||
53 | |||
54 | int width; | ||
55 | int height; | ||
56 | |||
57 | int current_frame; | ||
58 | uint8_t *frame[4]; | ||
59 | int dirty[4]; | ||
60 | int frame_size; | ||
61 | int video_size; | ||
62 | |||
63 | uint8_t *opcodes; | ||
64 | } PAFVideoDecContext; | ||
65 | |||
66 | 4 | static av_cold int paf_video_close(AVCodecContext *avctx) | |
67 | { | ||
68 | 4 | PAFVideoDecContext *c = avctx->priv_data; | |
69 | int i; | ||
70 | |||
71 | 4 | av_frame_free(&c->pic); | |
72 | |||
73 |
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20 | for (i = 0; i < 4; i++) |
74 | 16 | av_freep(&c->frame[i]); | |
75 | |||
76 | 4 | return 0; | |
77 | } | ||
78 | |||
79 | 4 | static av_cold int paf_video_init(AVCodecContext *avctx) | |
80 | { | ||
81 | 4 | PAFVideoDecContext *c = avctx->priv_data; | |
82 | int i; | ||
83 | int ret; | ||
84 | |||
85 | 4 | c->width = avctx->width; | |
86 | 4 | c->height = avctx->height; | |
87 | |||
88 |
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4 | if (avctx->height & 3 || avctx->width & 3) { |
89 | ✗ | av_log(avctx, AV_LOG_ERROR, | |
90 | "width %d and height %d must be multiplie of 4.\n", | ||
91 | avctx->width, avctx->height); | ||
92 | ✗ | return AVERROR_INVALIDDATA; | |
93 | } | ||
94 | |||
95 | 4 | avctx->pix_fmt = AV_PIX_FMT_PAL8; | |
96 | 4 | ret = av_image_check_size2(avctx->width, FFALIGN(avctx->height, 256), avctx->max_pixels, avctx->pix_fmt, 0, avctx); | |
97 |
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4 | if (ret < 0) |
98 | ✗ | return ret; | |
99 | |||
100 | 4 | c->pic = av_frame_alloc(); | |
101 |
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4 | if (!c->pic) |
102 | ✗ | return AVERROR(ENOMEM); | |
103 | |||
104 | 4 | c->frame_size = avctx->width * FFALIGN(avctx->height, 256); | |
105 | 4 | c->video_size = avctx->width * avctx->height; | |
106 |
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20 | for (i = 0; i < 4; i++) { |
107 | 16 | c->frame[i] = av_mallocz(c->frame_size); | |
108 |
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16 | if (!c->frame[i]) |
109 | ✗ | return AVERROR(ENOMEM); | |
110 | } | ||
111 | |||
112 | 4 | return 0; | |
113 | } | ||
114 | |||
115 | 612 | static void read4x4block(PAFVideoDecContext *c, uint8_t *dst, int width) | |
116 | { | ||
117 | int i; | ||
118 | |||
119 |
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3060 | for (i = 0; i < 4; i++) { |
120 | 2448 | bytestream2_get_buffer(&c->gb, dst, 4); | |
121 | 2448 | dst += width; | |
122 | } | ||
123 | 612 | } | |
124 | |||
125 | 9005 | static void copy_color_mask(uint8_t *dst, int width, uint8_t mask, uint8_t color) | |
126 | { | ||
127 | int i; | ||
128 | |||
129 |
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45025 | for (i = 0; i < 4; i++) { |
130 |
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36020 | if (mask & (1 << 7 - i)) |
131 | 7465 | dst[i] = color; | |
132 |
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36020 | if (mask & (1 << 3 - i)) |
133 | 7596 | dst[width + i] = color; | |
134 | } | ||
135 | 9005 | } | |
136 | |||
137 | 10810 | static void copy_src_mask(uint8_t *dst, int width, uint8_t mask, const uint8_t *src) | |
138 | { | ||
139 | int i; | ||
140 | |||
141 |
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54050 | for (i = 0; i < 4; i++) { |
142 |
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43240 | if (mask & (1 << 7 - i)) |
143 | 14148 | dst[i] = src[i]; | |
144 |
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43240 | if (mask & (1 << 3 - i)) |
145 | 14674 | dst[width + i] = src[width + i]; | |
146 | } | ||
147 | 10810 | } | |
148 | |||
149 | 24878 | static void set_src_position(PAFVideoDecContext *c, | |
150 | const uint8_t **p, | ||
151 | const uint8_t **pend) | ||
152 | { | ||
153 | 24878 | int val = bytestream2_get_be16(&c->gb); | |
154 | 24878 | int page = val >> 14; | |
155 | 24878 | int x = (val & 0x7F); | |
156 | 24878 | int y = ((val >> 7) & 0x7F); | |
157 | |||
158 | 24878 | *p = c->frame[page] + x * 2 + y * 2 * c->width; | |
159 | 24878 | *pend = c->frame[page] + c->frame_size; | |
160 | 24878 | } | |
161 | |||
162 | 6 | static int decode_0(PAFVideoDecContext *c, uint8_t *pkt, uint8_t code) | |
163 | { | ||
164 | uint32_t opcode_size, offset; | ||
165 | 6 | uint8_t *dst, *dend, mask = 0, color = 0; | |
166 | const uint8_t *src, *send, *opcodes; | ||
167 | 6 | int i, j, op = 0; | |
168 | |||
169 | 6 | i = bytestream2_get_byte(&c->gb); | |
170 |
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6 | if (i) { |
171 |
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6 | if (code & 0x10) { |
172 | int align; | ||
173 | |||
174 | 6 | align = bytestream2_tell(&c->gb) & 3; | |
175 |
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6 | if (align) |
176 | 6 | bytestream2_skip(&c->gb, 4 - align); | |
177 | } | ||
178 | do { | ||
179 | int page, val, x, y; | ||
180 | 6 | val = bytestream2_get_be16(&c->gb); | |
181 | 6 | page = val >> 14; | |
182 | 6 | x = (val & 0x7F) * 2; | |
183 | 6 | y = ((val >> 7) & 0x7F) * 2; | |
184 | 6 | dst = c->frame[page] + x + y * c->width; | |
185 | 6 | dend = c->frame[page] + c->frame_size; | |
186 | 6 | offset = (x & 0x7F) * 2; | |
187 | 6 | j = bytestream2_get_le16(&c->gb) + offset; | |
188 |
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6 | if (bytestream2_get_bytes_left(&c->gb) < (j - offset) * 16) |
189 | ✗ | return AVERROR_INVALIDDATA; | |
190 | 6 | c->dirty[page] = 1; | |
191 | do { | ||
192 | 612 | offset++; | |
193 |
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612 | if (dst + 3 * c->width + 4 > dend) |
194 | ✗ | return AVERROR_INVALIDDATA; | |
195 | 612 | read4x4block(c, dst, c->width); | |
196 |
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612 | if ((offset & 0x3F) == 0) |
197 | 7 | dst += c->width * 3; | |
198 | 612 | dst += 4; | |
199 |
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612 | } while (offset < j); |
200 |
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6 | } while (--i); |
201 | } | ||
202 | |||
203 | 6 | dst = c->frame[c->current_frame]; | |
204 | 6 | dend = c->frame[c->current_frame] + c->frame_size; | |
205 | do { | ||
206 | 18432 | set_src_position(c, &src, &send); | |
207 |
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18432 | if ((src + 3 * c->width + 4 > send) || |
208 |
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36864 | (dst + 3 * c->width + 4 > dend) || |
209 | 18432 | bytestream2_get_bytes_left(&c->gb) < 4) | |
210 | ✗ | return AVERROR_INVALIDDATA; | |
211 | 18432 | copy_block4(dst, src, c->width, c->width, 4); | |
212 | 18432 | i++; | |
213 |
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18432 | if ((i & 0x3F) == 0) |
214 | 288 | dst += c->width * 3; | |
215 | 18432 | dst += 4; | |
216 |
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18432 | } while (i < c->video_size / 16); |
217 | |||
218 | 6 | opcode_size = bytestream2_get_le16(&c->gb); | |
219 | 6 | bytestream2_skip(&c->gb, 2); | |
220 | |||
221 |
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6 | if (bytestream2_get_bytes_left(&c->gb) < opcode_size) |
222 | ✗ | return AVERROR_INVALIDDATA; | |
223 | |||
224 | 6 | opcodes = pkt + bytestream2_tell(&c->gb); | |
225 | 6 | bytestream2_skipu(&c->gb, opcode_size); | |
226 | |||
227 | 6 | dst = c->frame[c->current_frame]; | |
228 | |||
229 |
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294 | for (i = 0; i < c->height; i += 4, dst += c->width * 3) |
230 |
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18720 | for (j = 0; j < c->width; j += 4, dst += 4) { |
231 | 18432 | int opcode, k = 0; | |
232 |
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18432 | if (op > opcode_size) |
233 | ✗ | return AVERROR_INVALIDDATA; | |
234 |
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18432 | if (j & 4) { |
235 | 9216 | opcode = opcodes[op] & 15; | |
236 | 9216 | op++; | |
237 | } else { | ||
238 | 9216 | opcode = opcodes[op] >> 4; | |
239 | } | ||
240 | |||
241 |
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38247 | while (block_sequences[opcode][k]) { |
242 | 19815 | offset = c->width * 2; | |
243 | 19815 | code = block_sequences[opcode][k++]; | |
244 | |||
245 |
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19815 | switch (code) { |
246 | 4435 | case 2: | |
247 | 4435 | offset = 0; | |
248 | 5835 | case 3: | |
249 | 5835 | color = bytestream2_get_byte(&c->gb); | |
250 | 9005 | case 4: | |
251 | 9005 | mask = bytestream2_get_byte(&c->gb); | |
252 | 9005 | copy_color_mask(dst + offset, c->width, mask, color); | |
253 | 9005 | break; | |
254 | 5422 | case 5: | |
255 | 5422 | offset = 0; | |
256 | 6446 | case 6: | |
257 | 6446 | set_src_position(c, &src, &send); | |
258 | 10810 | case 7: | |
259 |
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10810 | if (src + offset + c->width + 4 > send) |
260 | ✗ | return AVERROR_INVALIDDATA; | |
261 | 10810 | mask = bytestream2_get_byte(&c->gb); | |
262 | 10810 | copy_src_mask(dst + offset, c->width, mask, src + offset); | |
263 | 10810 | break; | |
264 | } | ||
265 | } | ||
266 | } | ||
267 | |||
268 | 6 | return 0; | |
269 | } | ||
270 | |||
271 | 152 | static int paf_video_decode(AVCodecContext *avctx, AVFrame *rframe, | |
272 | int *got_frame, AVPacket *pkt) | ||
273 | { | ||
274 | 152 | PAFVideoDecContext *c = avctx->priv_data; | |
275 | uint8_t code, *dst, *end; | ||
276 | int i, frame, ret; | ||
277 | |||
278 |
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152 | if (pkt->size < 2) |
279 | ✗ | return AVERROR_INVALIDDATA; | |
280 | |||
281 | 152 | bytestream2_init(&c->gb, pkt->data, pkt->size); | |
282 | |||
283 | 152 | code = bytestream2_get_byte(&c->gb); | |
284 |
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152 | if ((code & 0xF) > 4 || (code & 0xF) == 3) { |
285 | ✗ | avpriv_request_sample(avctx, "unknown/invalid code"); | |
286 | ✗ | return AVERROR_INVALIDDATA; | |
287 | } | ||
288 | |||
289 |
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152 | if ((code & 0xF) == 0 && |
290 |
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6 | c->video_size / 32 - (int64_t)bytestream2_get_bytes_left(&c->gb) > c->video_size / 32 * (int64_t)avctx->discard_damaged_percentage / 100) |
291 | ✗ | return AVERROR_INVALIDDATA; | |
292 | |||
293 |
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152 | if ((ret = ff_reget_buffer(avctx, c->pic, 0)) < 0) |
294 | ✗ | return ret; | |
295 | |||
296 |
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152 | if (code & 0x20) { // frame is keyframe |
297 | 2 | memset(c->pic->data[1], 0, AVPALETTE_SIZE); | |
298 | 2 | c->current_frame = 0; | |
299 | 2 | c->pic->key_frame = 1; | |
300 | 2 | c->pic->pict_type = AV_PICTURE_TYPE_I; | |
301 | } else { | ||
302 | 150 | c->pic->key_frame = 0; | |
303 | 150 | c->pic->pict_type = AV_PICTURE_TYPE_P; | |
304 | } | ||
305 | |||
306 |
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152 | if (code & 0x40) { // palette update |
307 | 2 | uint32_t *out = (uint32_t *)c->pic->data[1]; | |
308 | int index, count; | ||
309 | |||
310 | 2 | index = bytestream2_get_byte(&c->gb); | |
311 | 2 | count = bytestream2_get_byte(&c->gb) + 1; | |
312 | |||
313 |
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2 | if (index + count > 256) |
314 | ✗ | return AVERROR_INVALIDDATA; | |
315 |
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2 | if (bytestream2_get_bytes_left(&c->gb) < 3 * count) |
316 | ✗ | return AVERROR_INVALIDDATA; | |
317 | |||
318 | 2 | out += index; | |
319 |
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514 | for (i = 0; i < count; i++) { |
320 | unsigned r, g, b; | ||
321 | |||
322 | 512 | r = bytestream2_get_byteu(&c->gb); | |
323 | 512 | r = r << 2 | r >> 4; | |
324 | 512 | g = bytestream2_get_byteu(&c->gb); | |
325 | 512 | g = g << 2 | g >> 4; | |
326 | 512 | b = bytestream2_get_byteu(&c->gb); | |
327 | 512 | b = b << 2 | b >> 4; | |
328 | 512 | *out++ = (0xFFU << 24) | (r << 16) | (g << 8) | b; | |
329 | } | ||
330 | 2 | c->pic->palette_has_changed = 1; | |
331 | } | ||
332 | |||
333 | 152 | c->dirty[c->current_frame] = 1; | |
334 |
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152 | if (code & 0x20) |
335 |
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10 | for (i = 0; i < 4; i++) { |
336 |
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8 | if (c->dirty[i]) |
337 | 5 | memset(c->frame[i], 0, c->frame_size); | |
338 | 8 | c->dirty[i] = 0; | |
339 | } | ||
340 | |||
341 |
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152 | switch (code & 0x0F) { |
342 | 6 | case 0: | |
343 | /* Block-based motion compensation using 4x4 blocks with either | ||
344 | * horizontal or vertical vectors; might incorporate VQ as well. */ | ||
345 |
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6 | if ((ret = decode_0(c, pkt->data, code)) < 0) |
346 | ✗ | return ret; | |
347 | 6 | break; | |
348 | ✗ | case 1: | |
349 | /* Uncompressed data. This mode specifies that (width * height) bytes | ||
350 | * should be copied directly from the encoded buffer into the output. */ | ||
351 | ✗ | dst = c->frame[c->current_frame]; | |
352 | // possibly chunk length data | ||
353 | ✗ | bytestream2_skip(&c->gb, 2); | |
354 | ✗ | if (bytestream2_get_bytes_left(&c->gb) < c->video_size) | |
355 | ✗ | return AVERROR_INVALIDDATA; | |
356 | ✗ | bytestream2_get_bufferu(&c->gb, dst, c->video_size); | |
357 | ✗ | break; | |
358 | 28 | case 2: | |
359 | /* Copy reference frame: Consume the next byte in the stream as the | ||
360 | * reference frame (which should be 0, 1, 2, or 3, and should not be | ||
361 | * the same as the current frame number). */ | ||
362 | 28 | frame = bytestream2_get_byte(&c->gb); | |
363 |
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28 | if (frame > 3) |
364 | ✗ | return AVERROR_INVALIDDATA; | |
365 |
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28 | if (frame != c->current_frame) |
366 | 7 | memcpy(c->frame[c->current_frame], c->frame[frame], c->frame_size); | |
367 | 28 | break; | |
368 | 118 | case 4: | |
369 | /* Run length encoding.*/ | ||
370 | 118 | dst = c->frame[c->current_frame]; | |
371 | 118 | end = dst + c->video_size; | |
372 | |||
373 | 118 | bytestream2_skip(&c->gb, 2); | |
374 | |||
375 |
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175341 | while (dst < end) { |
376 | int8_t code; | ||
377 | int count; | ||
378 | |||
379 |
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175223 | if (bytestream2_get_bytes_left(&c->gb) < 2) |
380 | ✗ | return AVERROR_INVALIDDATA; | |
381 | |||
382 | 175223 | code = bytestream2_get_byteu(&c->gb); | |
383 | 175223 | count = FFABS(code) + 1; | |
384 | |||
385 |
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175223 | if (dst + count > end) |
386 | ✗ | return AVERROR_INVALIDDATA; | |
387 |
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175223 | if (code < 0) |
388 | 116135 | memset(dst, bytestream2_get_byteu(&c->gb), count); | |
389 | else | ||
390 | 59088 | bytestream2_get_buffer(&c->gb, dst, count); | |
391 | 175223 | dst += count; | |
392 | } | ||
393 | 118 | break; | |
394 | ✗ | default: | |
395 | ✗ | av_assert0(0); | |
396 | } | ||
397 | |||
398 | 152 | av_image_copy_plane(c->pic->data[0], c->pic->linesize[0], | |
399 | 152 | c->frame[c->current_frame], c->width, | |
400 | c->width, c->height); | ||
401 | |||
402 | 152 | c->current_frame = (c->current_frame + 1) & 3; | |
403 |
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152 | if ((ret = av_frame_ref(rframe, c->pic)) < 0) |
404 | ✗ | return ret; | |
405 | |||
406 | 152 | *got_frame = 1; | |
407 | |||
408 | 152 | return pkt->size; | |
409 | } | ||
410 | |||
411 | const FFCodec ff_paf_video_decoder = { | ||
412 | .p.name = "paf_video", | ||
413 | .p.long_name = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File Video"), | ||
414 | .p.type = AVMEDIA_TYPE_VIDEO, | ||
415 | .p.id = AV_CODEC_ID_PAF_VIDEO, | ||
416 | .priv_data_size = sizeof(PAFVideoDecContext), | ||
417 | .init = paf_video_init, | ||
418 | .close = paf_video_close, | ||
419 | FF_CODEC_DECODE_CB(paf_video_decode), | ||
420 | .p.capabilities = AV_CODEC_CAP_DR1, | ||
421 | .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP, | ||
422 | }; | ||
423 |