FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/vmnc.c
Date: 2022-11-28 23:49:43
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 "libavutil/common.h"
29 #include "avcodec.h"
30 #include "codec_internal.h"
31 #include "decode.h"
32 #include "bytestream.h"
33
34 enum EncTypes {
35 MAGIC_WMVd = 0x574D5664,
36 MAGIC_WMVe,
37 MAGIC_WMVf,
38 MAGIC_WMVg,
39 MAGIC_WMVh,
40 MAGIC_WMVi,
41 MAGIC_WMVj
42 };
43
44 enum HexTile_Flags {
45 HT_RAW = 1, // tile is raw
46 HT_BKG = 2, // background color is present
47 HT_FG = 4, // foreground color is present
48 HT_SUB = 8, // subrects are present
49 HT_CLR = 16 // each subrect has own color
50 };
51
52 /*
53 * Decoder context
54 */
55 typedef struct VmncContext {
56 AVCodecContext *avctx;
57 AVFrame *pic;
58
59 int bpp;
60 int bpp2;
61 int bigendian;
62 uint8_t pal[768];
63 int width, height;
64 GetByteContext gb;
65
66 /* cursor data */
67 int cur_w, cur_h;
68 int cur_x, cur_y;
69 int cur_hx, cur_hy;
70 uint8_t *curbits, *curmask;
71 uint8_t *screendta;
72 } VmncContext;
73
74 /* read pixel value from stream */
75 401741 static av_always_inline int vmnc_get_pixel(GetByteContext *gb, int bpp, int be)
76 {
77
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401741 switch (bpp * 2 + be) {
78 case 2:
79 case 3:
80 return bytestream2_get_byte(gb);
81 58268 case 4:
82 58268 return bytestream2_get_le16(gb);
83 case 5:
84 return bytestream2_get_be16(gb);
85 343473 case 8:
86 343473 return bytestream2_get_le32(gb);
87 case 9:
88 return bytestream2_get_be32(gb);
89 default: return 0;
90 }
91 }
92
93 16 static void load_cursor(VmncContext *c)
94 {
95 int i, j, p;
96 16 const int bpp = c->bpp2;
97 16 uint8_t *dst8 = c->curbits;
98 16 uint16_t *dst16 = (uint16_t *)c->curbits;
99 16 uint32_t *dst32 = (uint32_t *)c->curbits;
100
101
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432 for (j = 0; j < c->cur_h; j++) {
102
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13728 for (i = 0; i < c->cur_w; i++) {
103 13312 p = vmnc_get_pixel(&c->gb, bpp, c->bigendian);
104
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13312 if (bpp == 1)
105 *dst8++ = p;
106
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13312 if (bpp == 2)
107 *dst16++ = p;
108
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13312 if (bpp == 4)
109 13312 *dst32++ = p;
110 }
111 }
112 16 dst8 = c->curmask;
113 16 dst16 = (uint16_t*)c->curmask;
114 16 dst32 = (uint32_t*)c->curmask;
115
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432 for (j = 0; j < c->cur_h; j++) {
116
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13728 for (i = 0; i < c->cur_w; i++) {
117 13312 p = vmnc_get_pixel(&c->gb, bpp, c->bigendian);
118
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13312 if (bpp == 1)
119 *dst8++ = p;
120
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13312 if (bpp == 2)
121 *dst16++ = p;
122
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13312 if (bpp == 4)
123 13312 *dst32++ = p;
124 }
125 }
126 16 }
127
128 49 static void put_cursor(uint8_t *dst, int stride, VmncContext *c, int dx, int dy)
129 {
130 int i, j;
131 int w, h, x, y;
132 49 w = c->cur_w;
133
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49 if (c->width < c->cur_x + c->cur_w)
134 w = c->width - c->cur_x;
135 49 h = c->cur_h;
136
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49 if (c->height < c->cur_y + c->cur_h)
137 h = c->height - c->cur_y;
138 49 x = c->cur_x;
139 49 y = c->cur_y;
140
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49 if (x < 0) {
141 w += x;
142 x = 0;
143 }
144
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49 if (y < 0) {
145 h += y;
146 y = 0;
147 }
148
149
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49 if ((w < 1) || (h < 1))
150 return;
151 49 dst += x * c->bpp2 + y * stride;
152
153
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49 if (c->bpp2 == 1) {
154 uint8_t *cd = c->curbits, *msk = c->curmask;
155 for (j = 0; j < h; j++) {
156 for (i = 0; i < w; i++)
157 dst[i] = (dst[i] & cd[i]) ^ msk[i];
158 msk += c->cur_w;
159 cd += c->cur_w;
160 dst += stride;
161 }
162
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49 } else if (c->bpp2 == 2) {
163 uint16_t *cd = (uint16_t*)c->curbits, *msk = (uint16_t*)c->curmask;
164 uint16_t *dst2;
165 for (j = 0; j < h; j++) {
166 dst2 = (uint16_t*)dst;
167 for (i = 0; i < w; i++)
168 dst2[i] = (dst2[i] & cd[i]) ^ msk[i];
169 msk += c->cur_w;
170 cd += c->cur_w;
171 dst += stride;
172 }
173
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49 } else if (c->bpp2 == 4) {
174 49 uint32_t *cd = (uint32_t*)c->curbits, *msk = (uint32_t*)c->curmask;
175 uint32_t *dst2;
176
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1617 for (j = 0; j < h; j++) {
177 1568 dst2 = (uint32_t*)dst;
178
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51744 for (i = 0; i < w; i++)
179 50176 dst2[i] = (dst2[i] & cd[i]) ^ msk[i];
180 1568 msk += c->cur_w;
181 1568 cd += c->cur_w;
182 1568 dst += stride;
183 }
184 }
185 }
186
187 /* fill rectangle with given color */
188 443805 static av_always_inline void paint_rect(uint8_t *dst, int dx, int dy,
189 int w, int h, int color,
190 int bpp, int stride)
191 {
192 int i, j;
193 443805 dst += dx * bpp + dy * stride;
194
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443805 if (bpp == 1) {
195 for (j = 0; j < h; j++) {
196 memset(dst, color, w);
197 dst += stride;
198 }
199
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443805 } else if (bpp == 2) {
200 uint16_t *dst2;
201
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779284 for (j = 0; j < h; j++) {
202 687588 dst2 = (uint16_t*)dst;
203
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9596125 for (i = 0; i < w; i++)
204 8908537 *dst2++ = color;
205 687588 dst += stride;
206 }
207
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352109 } else if (bpp == 4) {
208 uint32_t *dst2;
209
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1672564 for (j = 0; j < h; j++) {
210 1320455 dst2 = (uint32_t*)dst;
211
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14028614 for (i = 0; i < w; i++)
212 12708159 dst2[i] = color;
213 1320455 dst += stride;
214 }
215 }
216 443805 }
217
218 50 static av_always_inline void paint_raw(uint8_t *dst, int w, int h,
219 GetByteContext *gb, int bpp,
220 int be, int stride)
221 {
222 int i, j, p;
223
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467 for (j = 0; j < h; j++) {
224
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6621 for (i = 0; i < w; i++) {
225 6204 p = vmnc_get_pixel(gb, bpp, be);
226
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6204 switch (bpp) {
227 case 1:
228 dst[i] = p;
229 break;
230 case 2:
231 ((uint16_t*)dst)[i] = p;
232 break;
233 6204 case 4:
234 6204 ((uint32_t*)dst)[i] = p;
235 6204 break;
236 }
237 }
238 417 dst += stride;
239 }
240 50 }
241
242 463 static int decode_hextile(VmncContext *c, uint8_t* dst, GetByteContext *gb,
243 int w, int h, int stride)
244 {
245 int i, j, k;
246 463 int bg = 0, fg = 0, rects, color, flags, xy, wh;
247 463 const int bpp = c->bpp2;
248 uint8_t *dst2;
249 463 int bw = 16, bh = 16;
250
251
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2709 for (j = 0; j < h; j += 16) {
252 2247 dst2 = dst;
253 2247 bw = 16;
254
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2247 if (j + 16 > h)
255 420 bh = h - j;
256
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78438 for (i = 0; i < w; i += 16, dst2 += 16 * bpp) {
257
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76192 if (bytestream2_get_bytes_left(gb) <= 0) {
258 av_log(c->avctx, AV_LOG_ERROR, "Premature end of data!\n");
259 return AVERROR_INVALIDDATA;
260 }
261
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76192 if (i + 16 > w)
262 2103 bw = w - i;
263 76192 flags = bytestream2_get_byte(gb);
264
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76192 if (flags & HT_RAW) {
265
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42 if (bytestream2_get_bytes_left(gb) < bw * bh * bpp) {
266 av_log(c->avctx, AV_LOG_ERROR, "Premature end of data!\n");
267 return AVERROR_INVALIDDATA;
268 }
269 42 paint_raw(dst2, bw, bh, gb, bpp, c->bigendian, stride);
270 } else {
271
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76150 if (flags & HT_BKG)
272 1377 bg = vmnc_get_pixel(gb, bpp, c->bigendian);
273
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76150 if (flags & HT_FG)
274 1494 fg = vmnc_get_pixel(gb, bpp, c->bigendian);
275 76150 rects = 0;
276
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76150 if (flags & HT_SUB)
277 30064 rects = bytestream2_get_byte(gb);
278 76150 color = !!(flags & HT_CLR);
279
280 76150 paint_rect(dst2, 0, 0, bw, bh, bg, bpp, stride);
281
282
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76150 if (bytestream2_get_bytes_left(gb) < rects * (color * bpp + 2)) {
283 1 av_log(c->avctx, AV_LOG_ERROR, "Premature end of data!\n");
284 1 return AVERROR_INVALIDDATA;
285 }
286
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443804 for (k = 0; k < rects; k++) {
287 int rect_x, rect_y, rect_w, rect_h;
288
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367655 if (color)
289 366042 fg = vmnc_get_pixel(gb, bpp, c->bigendian);
290 367655 xy = bytestream2_get_byte(gb);
291 367655 wh = bytestream2_get_byte(gb);
292
293 367655 rect_x = xy >> 4;
294 367655 rect_y = xy & 0xF;
295 367655 rect_w = (wh >> 4) + 1;
296 367655 rect_h = (wh & 0xF) + 1;
297
298
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367655 if (rect_x + rect_w > w - i || rect_y + rect_h > h - j) {
299 av_log(c->avctx, AV_LOG_ERROR, "Rectangle outside picture\n");
300 return AVERROR_INVALIDDATA;
301 }
302
303 367655 paint_rect(dst2, rect_x, rect_y,
304 rect_w, rect_h, fg, bpp, stride);
305 }
306 }
307 }
308 2246 dst += stride * 16;
309 }
310 462 return 0;
311 }
312
313 static void reset_buffers(VmncContext *c)
314 {
315 av_freep(&c->curbits);
316 av_freep(&c->curmask);
317 av_freep(&c->screendta);
318 c->cur_w = c->cur_h = 0;
319 c->cur_hx = c->cur_hy = 0;
320
321 }
322
323 242 static int decode_frame(AVCodecContext *avctx, AVFrame *rframe,
324 int *got_frame, AVPacket *avpkt)
325 {
326 242 const uint8_t *buf = avpkt->data;
327 242 int buf_size = avpkt->size;
328 242 VmncContext * const c = avctx->priv_data;
329 242 GetByteContext *gb = &c->gb;
330 uint8_t *outptr;
331 int dx, dy, w, h, depth, enc, chunks, res, size_left, ret;
332
333 242 bytestream2_init(gb, buf, buf_size);
334 242 bytestream2_skip(gb, 2);
335 242 chunks = bytestream2_get_be16(gb);
336
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242 if (12LL * chunks > bytestream2_get_bytes_left(gb))
337 return AVERROR_INVALIDDATA;
338
339
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242 if ((ret = ff_reget_buffer(avctx, c->pic, 0)) < 0)
340 return ret;
341
342 242 c->pic->key_frame = 0;
343 242 c->pic->pict_type = AV_PICTURE_TYPE_P;
344
345 // restore screen after cursor
346
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242 if (c->screendta) {
347 int i;
348 49 w = c->cur_w;
349
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49 if (c->width < c->cur_x + w)
350 w = c->width - c->cur_x;
351 49 h = c->cur_h;
352
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49 if (c->height < c->cur_y + h)
353 h = c->height - c->cur_y;
354 49 dx = c->cur_x;
355
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49 if (dx < 0) {
356 w += dx;
357 dx = 0;
358 }
359 49 dy = c->cur_y;
360
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49 if (dy < 0) {
361 h += dy;
362 dy = 0;
363 }
364
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49 if ((w > 0) && (h > 0)) {
365 49 outptr = c->pic->data[0] + dx * c->bpp2 + dy * c->pic->linesize[0];
366
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1617 for (i = 0; i < h; i++) {
367 1568 memcpy(outptr, c->screendta + i * c->cur_w * c->bpp2,
368 1568 w * c->bpp2);
369 1568 outptr += c->pic->linesize[0];
370 }
371 }
372 }
373
374
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808 while (chunks--) {
375
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567 if (bytestream2_get_bytes_left(gb) < 12) {
376 av_log(avctx, AV_LOG_ERROR, "Premature end of data!\n");
377 return -1;
378 }
379 567 dx = bytestream2_get_be16(gb);
380 567 dy = bytestream2_get_be16(gb);
381 567 w = bytestream2_get_be16(gb);
382 567 h = bytestream2_get_be16(gb);
383 567 enc = bytestream2_get_be32(gb);
384
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567 if ((dx + w > c->width) || (dy + h > c->height)) {
385 av_log(avctx, AV_LOG_ERROR,
386 "Incorrect frame size: %ix%i+%ix%i of %ix%i\n",
387 w, h, dx, dy, c->width, c->height);
388 return AVERROR_INVALIDDATA;
389 }
390 567 outptr = c->pic->data[0] + dx * c->bpp2 + dy * c->pic->linesize[0];
391 567 size_left = bytestream2_get_bytes_left(gb);
392
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567 switch (enc) {
393 16 case MAGIC_WMVd: // cursor
394
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16 if (w*(int64_t)h*c->bpp2 > INT_MAX/2 - 2) {
395 av_log(avctx, AV_LOG_ERROR, "dimensions too large\n");
396 return AVERROR_INVALIDDATA;
397 }
398
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16 if (size_left < 2 + w * h * c->bpp2 * 2) {
399 av_log(avctx, AV_LOG_ERROR,
400 "Premature end of data! (need %i got %i)\n",
401 2 + w * h * c->bpp2 * 2, size_left);
402 return AVERROR_INVALIDDATA;
403 }
404 16 bytestream2_skip(gb, 2);
405 16 c->cur_w = w;
406 16 c->cur_h = h;
407 16 c->cur_hx = dx;
408 16 c->cur_hy = dy;
409
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16 if ((c->cur_hx > c->cur_w) || (c->cur_hy > c->cur_h)) {
410 av_log(avctx, AV_LOG_ERROR,
411 "Cursor hot spot is not in image: "
412 "%ix%i of %ix%i cursor size\n",
413 c->cur_hx, c->cur_hy, c->cur_w, c->cur_h);
414 c->cur_hx = c->cur_hy = 0;
415 }
416
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16 if (c->cur_w * c->cur_h >= INT_MAX / c->bpp2) {
417 reset_buffers(c);
418 return AVERROR(EINVAL);
419 } else {
420 16 int screen_size = c->cur_w * c->cur_h * c->bpp2;
421
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32 if ((ret = av_reallocp(&c->curbits, screen_size)) < 0 ||
422
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32 (ret = av_reallocp(&c->curmask, screen_size)) < 0 ||
423 16 (ret = av_reallocp(&c->screendta, screen_size)) < 0) {
424 reset_buffers(c);
425 return ret;
426 }
427 }
428 16 load_cursor(c);
429 16 break;
430 35 case MAGIC_WMVe: // unknown
431 35 bytestream2_skip(gb, 2);
432 35 break;
433 29 case MAGIC_WMVf: // update cursor position
434 29 c->cur_x = dx - c->cur_hx;
435 29 c->cur_y = dy - c->cur_hy;
436 29 break;
437 4 case MAGIC_WMVg: // unknown
438 4 bytestream2_skip(gb, 10);
439 4 break;
440 4 case MAGIC_WMVh: // unknown
441 4 bytestream2_skip(gb, 4);
442 4 break;
443 4 case MAGIC_WMVi: // ServerInitialization struct
444 4 c->pic->key_frame = 1;
445 4 c->pic->pict_type = AV_PICTURE_TYPE_I;
446 4 depth = bytestream2_get_byte(gb);
447
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4 if (depth != c->bpp) {
448 av_log(avctx, AV_LOG_INFO,
449 "Depth mismatch. Container %i bpp, "
450 "Frame data: %i bpp\n",
451 c->bpp, depth);
452 }
453 4 bytestream2_skip(gb, 1);
454 4 c->bigendian = bytestream2_get_byte(gb);
455
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4 if (c->bigendian & (~1)) {
456 av_log(avctx, AV_LOG_INFO,
457 "Invalid header: bigendian flag = %i\n", c->bigendian);
458 return AVERROR_INVALIDDATA;
459 }
460 //skip the rest of pixel format data
461 4 bytestream2_skip(gb, 13);
462 4 break;
463 4 case MAGIC_WMVj: // unknown
464 4 bytestream2_skip(gb, 2);
465 4 break;
466 8 case 0x00000000: // raw rectangle data
467
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8 if (size_left < w * h * c->bpp2) {
468 av_log(avctx, AV_LOG_ERROR,
469 "Premature end of data! (need %i got %i)\n",
470 w * h * c->bpp2, size_left);
471 return AVERROR_INVALIDDATA;
472 }
473 8 paint_raw(outptr, w, h, gb, c->bpp2, c->bigendian,
474 8 c->pic->linesize[0]);
475 8 break;
476 463 case 0x00000005: // HexTile encoded rectangle
477 463 res = decode_hextile(c, outptr, gb, w, h, c->pic->linesize[0]);
478
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463 if (res < 0)
479 1 return res;
480 462 break;
481 default:
482 av_log(avctx, AV_LOG_ERROR, "Unsupported block type 0x%08X\n", enc);
483 chunks = 0; // leave chunks decoding loop
484 }
485 }
486
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241 if (c->screendta) {
487 int i;
488 // save screen data before painting cursor
489 49 w = c->cur_w;
490
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49 if (c->width < c->cur_x + w)
491 w = c->width - c->cur_x;
492 49 h = c->cur_h;
493
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49 if (c->height < c->cur_y + h)
494 h = c->height - c->cur_y;
495 49 dx = c->cur_x;
496
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49 if (dx < 0) {
497 w += dx;
498 dx = 0;
499 }
500 49 dy = c->cur_y;
501
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49 if (dy < 0) {
502 h += dy;
503 dy = 0;
504 }
505
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49 if ((w > 0) && (h > 0)) {
506 49 outptr = c->pic->data[0] + dx * c->bpp2 + dy * c->pic->linesize[0];
507
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1617 for (i = 0; i < h; i++) {
508 1568 memcpy(c->screendta + i * c->cur_w * c->bpp2, outptr,
509 1568 w * c->bpp2);
510 1568 outptr += c->pic->linesize[0];
511 }
512 49 outptr = c->pic->data[0];
513 49 put_cursor(outptr, c->pic->linesize[0], c, c->cur_x, c->cur_y);
514 }
515 }
516 241 *got_frame = 1;
517
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241 if ((ret = av_frame_ref(rframe, c->pic)) < 0)
518 return ret;
519
520 /* always report that the buffer was completely consumed */
521 241 return buf_size;
522 }
523
524 4 static av_cold int decode_init(AVCodecContext *avctx)
525 {
526 4 VmncContext * const c = avctx->priv_data;
527
528 4 c->avctx = avctx;
529 4 c->width = avctx->width;
530 4 c->height = avctx->height;
531 4 c->bpp = avctx->bits_per_coded_sample;
532
533
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4 switch (c->bpp) {
534 case 8:
535 avctx->pix_fmt = AV_PIX_FMT_PAL8;
536 break;
537 2 case 16:
538 2 avctx->pix_fmt = AV_PIX_FMT_RGB555;
539 2 break;
540 case 24:
541 /* 24 bits is not technically supported, but some clients might
542 * mistakenly set it, so let's assume they actually meant 32 bits */
543 c->bpp = 32;
544 2 case 32:
545 2 avctx->pix_fmt = AV_PIX_FMT_0RGB32;
546 2 break;
547 default:
548 av_log(avctx, AV_LOG_ERROR, "Unsupported bitdepth %i\n", c->bpp);
549 return AVERROR_INVALIDDATA;
550 }
551 4 c->bpp2 = c->bpp / 8;
552
553 4 c->pic = av_frame_alloc();
554
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4 if (!c->pic)
555 return AVERROR(ENOMEM);
556
557 4 return 0;
558 }
559
560 4 static av_cold int decode_end(AVCodecContext *avctx)
561 {
562 4 VmncContext * const c = avctx->priv_data;
563
564 4 av_frame_free(&c->pic);
565
566 4 av_freep(&c->curbits);
567 4 av_freep(&c->curmask);
568 4 av_freep(&c->screendta);
569 4 return 0;
570 }
571
572 const FFCodec ff_vmnc_decoder = {
573 .p.name = "vmnc",
574 CODEC_LONG_NAME("VMware Screen Codec / VMware Video"),
575 .p.type = AVMEDIA_TYPE_VIDEO,
576 .p.id = AV_CODEC_ID_VMNC,
577 .priv_data_size = sizeof(VmncContext),
578 .init = decode_init,
579 .close = decode_end,
580 FF_CODEC_DECODE_CB(decode_frame),
581 .p.capabilities = AV_CODEC_CAP_DR1,
582 };
583