FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/vmnc.c
Date: 2021-09-26 18:22:30
Exec Total Coverage
Lines: 253 355 71.3%
Branches: 125 197 63.5%

Line Branch Exec Source
1 /*
2 * VMware Screen Codec (VMnc) decoder
3 * Copyright (c) 2006 Konstantin Shishkov
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 /**
23 * @file
24 * VMware Screen Codec (VMnc) decoder
25 * As Alex Beregszaszi discovered, this is effectively RFB data dump
26 */
27
28 #include <stdio.h>
29 #include <stdlib.h>
30
31 #include "libavutil/common.h"
32 #include "libavutil/intreadwrite.h"
33 #include "avcodec.h"
34 #include "internal.h"
35 #include "bytestream.h"
36
37 enum EncTypes {
38 MAGIC_WMVd = 0x574D5664,
39 MAGIC_WMVe,
40 MAGIC_WMVf,
41 MAGIC_WMVg,
42 MAGIC_WMVh,
43 MAGIC_WMVi,
44 MAGIC_WMVj
45 };
46
47 enum HexTile_Flags {
48 HT_RAW = 1, // tile is raw
49 HT_BKG = 2, // background color is present
50 HT_FG = 4, // foreground color is present
51 HT_SUB = 8, // subrects are present
52 HT_CLR = 16 // each subrect has own color
53 };
54
55 /*
56 * Decoder context
57 */
58 typedef struct VmncContext {
59 AVCodecContext *avctx;
60 AVFrame *pic;
61
62 int bpp;
63 int bpp2;
64 int bigendian;
65 uint8_t pal[768];
66 int width, height;
67 GetByteContext gb;
68
69 /* cursor data */
70 int cur_w, cur_h;
71 int cur_x, cur_y;
72 int cur_hx, cur_hy;
73 uint8_t *curbits, *curmask;
74 uint8_t *screendta;
75 } VmncContext;
76
77 /* read pixel value from stream */
78 401741 static av_always_inline int vmnc_get_pixel(GetByteContext *gb, int bpp, int be)
79 {
80
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401741 switch (bpp * 2 + be) {
81 case 2:
82 case 3:
83 return bytestream2_get_byte(gb);
84 58268 case 4:
85 58268 return bytestream2_get_le16(gb);
86 case 5:
87 return bytestream2_get_be16(gb);
88 343473 case 8:
89 343473 return bytestream2_get_le32(gb);
90 case 9:
91 return bytestream2_get_be32(gb);
92 default: return 0;
93 }
94 }
95
96 16 static void load_cursor(VmncContext *c)
97 {
98 int i, j, p;
99 16 const int bpp = c->bpp2;
100 16 uint8_t *dst8 = c->curbits;
101 16 uint16_t *dst16 = (uint16_t *)c->curbits;
102 16 uint32_t *dst32 = (uint32_t *)c->curbits;
103
104
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432 for (j = 0; j < c->cur_h; j++) {
105
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13728 for (i = 0; i < c->cur_w; i++) {
106 13312 p = vmnc_get_pixel(&c->gb, bpp, c->bigendian);
107
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13312 if (bpp == 1)
108 *dst8++ = p;
109
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13312 if (bpp == 2)
110 *dst16++ = p;
111
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13312 if (bpp == 4)
112 13312 *dst32++ = p;
113 }
114 }
115 16 dst8 = c->curmask;
116 16 dst16 = (uint16_t*)c->curmask;
117 16 dst32 = (uint32_t*)c->curmask;
118
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432 for (j = 0; j < c->cur_h; j++) {
119
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13728 for (i = 0; i < c->cur_w; i++) {
120 13312 p = vmnc_get_pixel(&c->gb, bpp, c->bigendian);
121
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13312 if (bpp == 1)
122 *dst8++ = p;
123
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13312 if (bpp == 2)
124 *dst16++ = p;
125
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13312 if (bpp == 4)
126 13312 *dst32++ = p;
127 }
128 }
129 16 }
130
131 49 static void put_cursor(uint8_t *dst, int stride, VmncContext *c, int dx, int dy)
132 {
133 int i, j;
134 int w, h, x, y;
135 49 w = c->cur_w;
136
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49 if (c->width < c->cur_x + c->cur_w)
137 w = c->width - c->cur_x;
138 49 h = c->cur_h;
139
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49 if (c->height < c->cur_y + c->cur_h)
140 h = c->height - c->cur_y;
141 49 x = c->cur_x;
142 49 y = c->cur_y;
143
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49 if (x < 0) {
144 w += x;
145 x = 0;
146 }
147
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49 if (y < 0) {
148 h += y;
149 y = 0;
150 }
151
152
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49 if ((w < 1) || (h < 1))
153 return;
154 49 dst += x * c->bpp2 + y * stride;
155
156
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49 if (c->bpp2 == 1) {
157 uint8_t *cd = c->curbits, *msk = c->curmask;
158 for (j = 0; j < h; j++) {
159 for (i = 0; i < w; i++)
160 dst[i] = (dst[i] & cd[i]) ^ msk[i];
161 msk += c->cur_w;
162 cd += c->cur_w;
163 dst += stride;
164 }
165
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49 } else if (c->bpp2 == 2) {
166 uint16_t *cd = (uint16_t*)c->curbits, *msk = (uint16_t*)c->curmask;
167 uint16_t *dst2;
168 for (j = 0; j < h; j++) {
169 dst2 = (uint16_t*)dst;
170 for (i = 0; i < w; i++)
171 dst2[i] = (dst2[i] & cd[i]) ^ msk[i];
172 msk += c->cur_w;
173 cd += c->cur_w;
174 dst += stride;
175 }
176
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49 } else if (c->bpp2 == 4) {
177 49 uint32_t *cd = (uint32_t*)c->curbits, *msk = (uint32_t*)c->curmask;
178 uint32_t *dst2;
179
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1617 for (j = 0; j < h; j++) {
180 1568 dst2 = (uint32_t*)dst;
181
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51744 for (i = 0; i < w; i++)
182 50176 dst2[i] = (dst2[i] & cd[i]) ^ msk[i];
183 1568 msk += c->cur_w;
184 1568 cd += c->cur_w;
185 1568 dst += stride;
186 }
187 }
188 }
189
190 /* fill rectangle with given color */
191 443805 static av_always_inline void paint_rect(uint8_t *dst, int dx, int dy,
192 int w, int h, int color,
193 int bpp, int stride)
194 {
195 int i, j;
196 443805 dst += dx * bpp + dy * stride;
197
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443805 if (bpp == 1) {
198 for (j = 0; j < h; j++) {
199 memset(dst, color, w);
200 dst += stride;
201 }
202
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443805 } else if (bpp == 2) {
203 uint16_t *dst2;
204
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779284 for (j = 0; j < h; j++) {
205 687588 dst2 = (uint16_t*)dst;
206
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9596125 for (i = 0; i < w; i++)
207 8908537 *dst2++ = color;
208 687588 dst += stride;
209 }
210
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352109 } else if (bpp == 4) {
211 uint32_t *dst2;
212
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1672564 for (j = 0; j < h; j++) {
213 1320455 dst2 = (uint32_t*)dst;
214
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14028614 for (i = 0; i < w; i++)
215 12708159 dst2[i] = color;
216 1320455 dst += stride;
217 }
218 }
219 443805 }
220
221 50 static av_always_inline void paint_raw(uint8_t *dst, int w, int h,
222 GetByteContext *gb, int bpp,
223 int be, int stride)
224 {
225 int i, j, p;
226
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467 for (j = 0; j < h; j++) {
227
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6621 for (i = 0; i < w; i++) {
228 6204 p = vmnc_get_pixel(gb, bpp, be);
229
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6204 switch (bpp) {
230 case 1:
231 dst[i] = p;
232 break;
233 case 2:
234 ((uint16_t*)dst)[i] = p;
235 break;
236 6204 case 4:
237 6204 ((uint32_t*)dst)[i] = p;
238 6204 break;
239 }
240 }
241 417 dst += stride;
242 }
243 50 }
244
245 463 static int decode_hextile(VmncContext *c, uint8_t* dst, GetByteContext *gb,
246 int w, int h, int stride)
247 {
248 int i, j, k;
249 463 int bg = 0, fg = 0, rects, color, flags, xy, wh;
250 463 const int bpp = c->bpp2;
251 uint8_t *dst2;
252 463 int bw = 16, bh = 16;
253
254
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2709 for (j = 0; j < h; j += 16) {
255 2247 dst2 = dst;
256 2247 bw = 16;
257
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2247 if (j + 16 > h)
258 420 bh = h - j;
259
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78438 for (i = 0; i < w; i += 16, dst2 += 16 * bpp) {
260
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76192 if (bytestream2_get_bytes_left(gb) <= 0) {
261 av_log(c->avctx, AV_LOG_ERROR, "Premature end of data!\n");
262 return AVERROR_INVALIDDATA;
263 }
264
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76192 if (i + 16 > w)
265 2103 bw = w - i;
266 76192 flags = bytestream2_get_byte(gb);
267
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76192 if (flags & HT_RAW) {
268
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42 if (bytestream2_get_bytes_left(gb) < bw * bh * bpp) {
269 av_log(c->avctx, AV_LOG_ERROR, "Premature end of data!\n");
270 return AVERROR_INVALIDDATA;
271 }
272 42 paint_raw(dst2, bw, bh, gb, bpp, c->bigendian, stride);
273 } else {
274
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76150 if (flags & HT_BKG)
275 1377 bg = vmnc_get_pixel(gb, bpp, c->bigendian);
276
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76150 if (flags & HT_FG)
277 1494 fg = vmnc_get_pixel(gb, bpp, c->bigendian);
278 76150 rects = 0;
279
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76150 if (flags & HT_SUB)
280 30064 rects = bytestream2_get_byte(gb);
281 76150 color = !!(flags & HT_CLR);
282
283 76150 paint_rect(dst2, 0, 0, bw, bh, bg, bpp, stride);
284
285
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76150 if (bytestream2_get_bytes_left(gb) < rects * (color * bpp + 2)) {
286 1 av_log(c->avctx, AV_LOG_ERROR, "Premature end of data!\n");
287 1 return AVERROR_INVALIDDATA;
288 }
289
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443804 for (k = 0; k < rects; k++) {
290 int rect_x, rect_y, rect_w, rect_h;
291
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367655 if (color)
292 366042 fg = vmnc_get_pixel(gb, bpp, c->bigendian);
293 367655 xy = bytestream2_get_byte(gb);
294 367655 wh = bytestream2_get_byte(gb);
295
296 367655 rect_x = xy >> 4;
297 367655 rect_y = xy & 0xF;
298 367655 rect_w = (wh >> 4) + 1;
299 367655 rect_h = (wh & 0xF) + 1;
300
301
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367655 if (rect_x + rect_w > w - i || rect_y + rect_h > h - j) {
302 av_log(c->avctx, AV_LOG_ERROR, "Rectangle outside picture\n");
303 return AVERROR_INVALIDDATA;
304 }
305
306 367655 paint_rect(dst2, rect_x, rect_y,
307 rect_w, rect_h, fg, bpp, stride);
308 }
309 }
310 }
311 2246 dst += stride * 16;
312 }
313 462 return 0;
314 }
315
316 static void reset_buffers(VmncContext *c)
317 {
318 av_freep(&c->curbits);
319 av_freep(&c->curmask);
320 av_freep(&c->screendta);
321 c->cur_w = c->cur_h = 0;
322 c->cur_hx = c->cur_hy = 0;
323
324 }
325
326 242 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
327 AVPacket *avpkt)
328 {
329 242 const uint8_t *buf = avpkt->data;
330 242 int buf_size = avpkt->size;
331 242 VmncContext * const c = avctx->priv_data;
332 242 GetByteContext *gb = &c->gb;
333 uint8_t *outptr;
334 int dx, dy, w, h, depth, enc, chunks, res, size_left, ret;
335
336 242 bytestream2_init(gb, buf, buf_size);
337 242 bytestream2_skip(gb, 2);
338 242 chunks = bytestream2_get_be16(gb);
339
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242 if (12LL * chunks > bytestream2_get_bytes_left(gb))
340 return AVERROR_INVALIDDATA;
341
342
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242 if ((ret = ff_reget_buffer(avctx, c->pic, 0)) < 0)
343 return ret;
344
345 242 c->pic->key_frame = 0;
346 242 c->pic->pict_type = AV_PICTURE_TYPE_P;
347
348 // restore screen after cursor
349
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242 if (c->screendta) {
350 int i;
351 49 w = c->cur_w;
352
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49 if (c->width < c->cur_x + w)
353 w = c->width - c->cur_x;
354 49 h = c->cur_h;
355
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49 if (c->height < c->cur_y + h)
356 h = c->height - c->cur_y;
357 49 dx = c->cur_x;
358
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49 if (dx < 0) {
359 w += dx;
360 dx = 0;
361 }
362 49 dy = c->cur_y;
363
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49 if (dy < 0) {
364 h += dy;
365 dy = 0;
366 }
367
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49 if ((w > 0) && (h > 0)) {
368 49 outptr = c->pic->data[0] + dx * c->bpp2 + dy * c->pic->linesize[0];
369
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1617 for (i = 0; i < h; i++) {
370 1568 memcpy(outptr, c->screendta + i * c->cur_w * c->bpp2,
371 1568 w * c->bpp2);
372 1568 outptr += c->pic->linesize[0];
373 }
374 }
375 }
376
377
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808 while (chunks--) {
378
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567 if (bytestream2_get_bytes_left(gb) < 12) {
379 av_log(avctx, AV_LOG_ERROR, "Premature end of data!\n");
380 return -1;
381 }
382 567 dx = bytestream2_get_be16(gb);
383 567 dy = bytestream2_get_be16(gb);
384 567 w = bytestream2_get_be16(gb);
385 567 h = bytestream2_get_be16(gb);
386 567 enc = bytestream2_get_be32(gb);
387
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567 if ((dx + w > c->width) || (dy + h > c->height)) {
388 av_log(avctx, AV_LOG_ERROR,
389 "Incorrect frame size: %ix%i+%ix%i of %ix%i\n",
390 w, h, dx, dy, c->width, c->height);
391 return AVERROR_INVALIDDATA;
392 }
393 567 outptr = c->pic->data[0] + dx * c->bpp2 + dy * c->pic->linesize[0];
394 567 size_left = bytestream2_get_bytes_left(gb);
395
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567 switch (enc) {
396 16 case MAGIC_WMVd: // cursor
397
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16 if (w*(int64_t)h*c->bpp2 > INT_MAX/2 - 2) {
398 av_log(avctx, AV_LOG_ERROR, "dimensions too large\n");
399 return AVERROR_INVALIDDATA;
400 }
401
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16 if (size_left < 2 + w * h * c->bpp2 * 2) {
402 av_log(avctx, AV_LOG_ERROR,
403 "Premature end of data! (need %i got %i)\n",
404 2 + w * h * c->bpp2 * 2, size_left);
405 return AVERROR_INVALIDDATA;
406 }
407 16 bytestream2_skip(gb, 2);
408 16 c->cur_w = w;
409 16 c->cur_h = h;
410 16 c->cur_hx = dx;
411 16 c->cur_hy = dy;
412
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16 if ((c->cur_hx > c->cur_w) || (c->cur_hy > c->cur_h)) {
413 av_log(avctx, AV_LOG_ERROR,
414 "Cursor hot spot is not in image: "
415 "%ix%i of %ix%i cursor size\n",
416 c->cur_hx, c->cur_hy, c->cur_w, c->cur_h);
417 c->cur_hx = c->cur_hy = 0;
418 }
419
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16 if (c->cur_w * c->cur_h >= INT_MAX / c->bpp2) {
420 reset_buffers(c);
421 return AVERROR(EINVAL);
422 } else {
423 16 int screen_size = c->cur_w * c->cur_h * c->bpp2;
424
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32 if ((ret = av_reallocp(&c->curbits, screen_size)) < 0 ||
425
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32 (ret = av_reallocp(&c->curmask, screen_size)) < 0 ||
426 16 (ret = av_reallocp(&c->screendta, screen_size)) < 0) {
427 reset_buffers(c);
428 return ret;
429 }
430 }
431 16 load_cursor(c);
432 16 break;
433 35 case MAGIC_WMVe: // unknown
434 35 bytestream2_skip(gb, 2);
435 35 break;
436 29 case MAGIC_WMVf: // update cursor position
437 29 c->cur_x = dx - c->cur_hx;
438 29 c->cur_y = dy - c->cur_hy;
439 29 break;
440 4 case MAGIC_WMVg: // unknown
441 4 bytestream2_skip(gb, 10);
442 4 break;
443 4 case MAGIC_WMVh: // unknown
444 4 bytestream2_skip(gb, 4);
445 4 break;
446 4 case MAGIC_WMVi: // ServerInitialization struct
447 4 c->pic->key_frame = 1;
448 4 c->pic->pict_type = AV_PICTURE_TYPE_I;
449 4 depth = bytestream2_get_byte(gb);
450
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4 if (depth != c->bpp) {
451 av_log(avctx, AV_LOG_INFO,
452 "Depth mismatch. Container %i bpp, "
453 "Frame data: %i bpp\n",
454 c->bpp, depth);
455 }
456 4 bytestream2_skip(gb, 1);
457 4 c->bigendian = bytestream2_get_byte(gb);
458
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4 if (c->bigendian & (~1)) {
459 av_log(avctx, AV_LOG_INFO,
460 "Invalid header: bigendian flag = %i\n", c->bigendian);
461 return AVERROR_INVALIDDATA;
462 }
463 //skip the rest of pixel format data
464 4 bytestream2_skip(gb, 13);
465 4 break;
466 4 case MAGIC_WMVj: // unknown
467 4 bytestream2_skip(gb, 2);
468 4 break;
469 8 case 0x00000000: // raw rectangle data
470
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8 if (size_left < w * h * c->bpp2) {
471 av_log(avctx, AV_LOG_ERROR,
472 "Premature end of data! (need %i got %i)\n",
473 w * h * c->bpp2, size_left);
474 return AVERROR_INVALIDDATA;
475 }
476 8 paint_raw(outptr, w, h, gb, c->bpp2, c->bigendian,
477 8 c->pic->linesize[0]);
478 8 break;
479 463 case 0x00000005: // HexTile encoded rectangle
480 463 res = decode_hextile(c, outptr, gb, w, h, c->pic->linesize[0]);
481
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463 if (res < 0)
482 1 return res;
483 462 break;
484 default:
485 av_log(avctx, AV_LOG_ERROR, "Unsupported block type 0x%08X\n", enc);
486 chunks = 0; // leave chunks decoding loop
487 }
488 }
489
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241 if (c->screendta) {
490 int i;
491 // save screen data before painting cursor
492 49 w = c->cur_w;
493
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49 if (c->width < c->cur_x + w)
494 w = c->width - c->cur_x;
495 49 h = c->cur_h;
496
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49 if (c->height < c->cur_y + h)
497 h = c->height - c->cur_y;
498 49 dx = c->cur_x;
499
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49 if (dx < 0) {
500 w += dx;
501 dx = 0;
502 }
503 49 dy = c->cur_y;
504
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49 if (dy < 0) {
505 h += dy;
506 dy = 0;
507 }
508
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49 if ((w > 0) && (h > 0)) {
509 49 outptr = c->pic->data[0] + dx * c->bpp2 + dy * c->pic->linesize[0];
510
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1617 for (i = 0; i < h; i++) {
511 1568 memcpy(c->screendta + i * c->cur_w * c->bpp2, outptr,
512 1568 w * c->bpp2);
513 1568 outptr += c->pic->linesize[0];
514 }
515 49 outptr = c->pic->data[0];
516 49 put_cursor(outptr, c->pic->linesize[0], c, c->cur_x, c->cur_y);
517 }
518 }
519 241 *got_frame = 1;
520
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241 if ((ret = av_frame_ref(data, c->pic)) < 0)
521 return ret;
522
523 /* always report that the buffer was completely consumed */
524 241 return buf_size;
525 }
526
527 4 static av_cold int decode_init(AVCodecContext *avctx)
528 {
529 4 VmncContext * const c = avctx->priv_data;
530
531 4 c->avctx = avctx;
532 4 c->width = avctx->width;
533 4 c->height = avctx->height;
534 4 c->bpp = avctx->bits_per_coded_sample;
535
536
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4 switch (c->bpp) {
537 case 8:
538 avctx->pix_fmt = AV_PIX_FMT_PAL8;
539 break;
540 2 case 16:
541 2 avctx->pix_fmt = AV_PIX_FMT_RGB555;
542 2 break;
543 case 24:
544 /* 24 bits is not technically supported, but some clients might
545 * mistakenly set it, so let's assume they actually meant 32 bits */
546 c->bpp = 32;
547 2 case 32:
548 2 avctx->pix_fmt = AV_PIX_FMT_0RGB32;
549 2 break;
550 default:
551 av_log(avctx, AV_LOG_ERROR, "Unsupported bitdepth %i\n", c->bpp);
552 return AVERROR_INVALIDDATA;
553 }
554 4 c->bpp2 = c->bpp / 8;
555
556 4 c->pic = av_frame_alloc();
557
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4 if (!c->pic)
558 return AVERROR(ENOMEM);
559
560 4 return 0;
561 }
562
563 4 static av_cold int decode_end(AVCodecContext *avctx)
564 {
565 4 VmncContext * const c = avctx->priv_data;
566
567 4 av_frame_free(&c->pic);
568
569 4 av_freep(&c->curbits);
570 4 av_freep(&c->curmask);
571 4 av_freep(&c->screendta);
572 4 return 0;
573 }
574
575 const AVCodec ff_vmnc_decoder = {
576 .name = "vmnc",
577 .long_name = NULL_IF_CONFIG_SMALL("VMware Screen Codec / VMware Video"),
578 .type = AVMEDIA_TYPE_VIDEO,
579 .id = AV_CODEC_ID_VMNC,
580 .priv_data_size = sizeof(VmncContext),
581 .init = decode_init,
582 .close = decode_end,
583 .decode = decode_frame,
584 .capabilities = AV_CODEC_CAP_DR1,
585 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
586 };
587