FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/pafvideo.c
Date: 2021-09-23 20:34:37
Exec Total Coverage
Lines: 192 224 85.7%
Branches: 92 126 73.0%

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