libavcodec/vmnc.c

   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 vmnc.c
  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 "avcodec.h"
  32
  33 enum EncTypes {
  34     MAGIC_WMVd = 0x574D5664,
  35     MAGIC_WMVe,
  36     MAGIC_WMVf,
  37     MAGIC_WMVg,
  38     MAGIC_WMVh,
  39     MAGIC_WMVi,
  40     MAGIC_WMVj
  41 };
  42
  43 enum HexTile_Flags {
  44     HT_RAW =  1, // tile is raw
  45     HT_BKG =  2, // background color is present
  46     HT_FG  =  4, // foreground color is present
  47     HT_SUB =  8, // subrects are present
  48     HT_CLR = 16  // each subrect has own color
  49 };
  50
  51 /*
  52  * Decoder context
  53  */
  54 typedef struct VmncContext {
  55     AVCodecContext *avctx;
  56     AVFrame pic;
  57
  58     int bpp;
  59     int bpp2;
  60     int bigendian;
  61     uint8_t pal[768];
  62     int width, height;
  63
  64     /* cursor data */
  65     int cur_w, cur_h;
  66     int cur_x, cur_y;
  67     int cur_hx, cur_hy;
  68     uint8_t* curbits, *curmask;
  69     uint8_t* screendta;
  70 } VmncContext;
  71
  72 /* read pixel value from stream */
  73 static av_always_inline int vmnc_get_pixel(const uint8_t* buf, int bpp, int be) {
  74     switch(bpp * 2 + be) {
  75     case 2:
  76     case 3: return *buf;
  77     case 4: return AV_RL16(buf);
  78     case 5: return AV_RB16(buf);
  79     case 8: return AV_RL32(buf);
  80     case 9: return AV_RB32(buf);
  81     default: return 0;
  82     }
  83 }
  84
  85 static void load_cursor(VmncContext *c, const uint8_t *src)
  86 {
  87     int i, j, p;
  88     const int bpp = c->bpp2;
  89     uint8_t  *dst8  = c->curbits;
  90     uint16_t *dst16 = (uint16_t*)c->curbits;
  91     uint32_t *dst32 = (uint32_t*)c->curbits;
  92
  93     for(j = 0; j < c->cur_h; j++) {
  94         for(i = 0; i < c->cur_w; i++) {
  95             p = vmnc_get_pixel(src, bpp, c->bigendian);
  96             src += bpp;
  97             if(bpp == 1) *dst8++ = p;
  98             if(bpp == 2) *dst16++ = p;
  99             if(bpp == 4) *dst32++ = p;
 100         }
 101     }
 102     dst8 = c->curmask;
 103     dst16 = (uint16_t*)c->curmask;
 104     dst32 = (uint32_t*)c->curmask;
 105     for(j = 0; j < c->cur_h; j++) {
 106         for(i = 0; i < c->cur_w; i++) {
 107             p = vmnc_get_pixel(src, bpp, c->bigendian);
 108             src += bpp;
 109             if(bpp == 1) *dst8++ = p;
 110             if(bpp == 2) *dst16++ = p;
 111             if(bpp == 4) *dst32++ = p;
 112         }
 113     }
 114 }
 115
 116 static void put_cursor(uint8_t *dst, int stride, VmncContext *c, int dx, int dy)
 117 {
 118     int i, j;
 119     int w, h, x, y;
 120     w = c->cur_w;
 121     if(c->width < c->cur_x + c->cur_w) w = c->width - c->cur_x;
 122     h = c->cur_h;
 123     if(c->height < c->cur_y + c->cur_h) h = c->height - c->cur_y;
 124     x = c->cur_x;
 125     y = c->cur_y;
 126     if(x < 0) {
 127         w += x;
 128         x = 0;
 129     }
 130     if(y < 0) {
 131         h += y;
 132         y = 0;
 133     }
 134
 135     if((w < 1) || (h < 1)) return;
 136     dst += x * c->bpp2 + y * stride;
 137
 138     if(c->bpp2 == 1) {
 139         uint8_t* cd = c->curbits, *msk = c->curmask;
 140         for(j = 0; j < h; j++) {
 141             for(i = 0; i < w; i++)
 142                 dst[i] = (dst[i] & cd[i]) ^ msk[i];
 143             msk += c->cur_w;
 144             cd += c->cur_w;
 145             dst += stride;
 146         }
 147     } else if(c->bpp2 == 2) {
 148         uint16_t* cd = (uint16_t*)c->curbits, *msk = (uint16_t*)c->curmask;
 149         uint16_t* dst2;
 150         for(j = 0; j < h; j++) {
 151             dst2 = (uint16_t*)dst;
 152             for(i = 0; i < w; i++)
 153                 dst2[i] = (dst2[i] & cd[i]) ^ msk[i];
 154             msk += c->cur_w;
 155             cd += c->cur_w;
 156             dst += stride;
 157         }
 158     } else if(c->bpp2 == 4) {
 159         uint32_t* cd = (uint32_t*)c->curbits, *msk = (uint32_t*)c->curmask;
 160         uint32_t* dst2;
 161         for(j = 0; j < h; j++) {
 162             dst2 = (uint32_t*)dst;
 163             for(i = 0; i < w; i++)
 164                 dst2[i] = (dst2[i] & cd[i]) ^ msk[i];
 165             msk += c->cur_w;
 166             cd += c->cur_w;
 167             dst += stride;
 168         }
 169     }
 170 }
 171
 172 /* fill rectangle with given color */
 173 static av_always_inline void paint_rect(uint8_t *dst, int dx, int dy, int w, int h, int color, int bpp, int stride)
 174 {
 175     int i, j;
 176     dst += dx * bpp + dy * stride;
 177     if(bpp == 1){
 178         for(j = 0; j < h; j++) {
 179             memset(dst, color, w);
 180             dst += stride;
 181         }
 182     }else if(bpp == 2){
 183         uint16_t* dst2;
 184         for(j = 0; j < h; j++) {
 185             dst2 = (uint16_t*)dst;
 186             for(i = 0; i < w; i++) {
 187                 *dst2++ = color;
 188             }
 189             dst += stride;
 190         }
 191     }else if(bpp == 4){
 192         uint32_t* dst2;
 193         for(j = 0; j < h; j++) {
 194             dst2 = (uint32_t*)dst;
 195             for(i = 0; i < w; i++) {
 196                 dst2[i] = color;
 197             }
 198             dst += stride;
 199         }
 200     }
 201 }
 202
 203 static av_always_inline void paint_raw(uint8_t *dst, int w, int h, const uint8_t* src, int bpp, int be, int stride)
 204 {
 205     int i, j, p;
 206     for(j = 0; j < h; j++) {
 207         for(i = 0; i < w; i++) {
 208             p = vmnc_get_pixel(src, bpp, be);
 209             src += bpp;
 210             switch(bpp){
 211             case 1:
 212                 dst[i] = p;
 213                 break;
 214             case 2:
 215                 ((uint16_t*)dst)[i] = p;
 216                 break;
 217             case 4:
 218                 ((uint32_t*)dst)[i] = p;
 219                 break;
 220             }
 221         }
 222         dst += stride;
 223     }
 224 }
 225
 226 static int decode_hextile(VmncContext *c, uint8_t* dst, const uint8_t* src, int ssize, int w, int h, int stride)
 227 {
 228     int i, j, k;
 229     int bg = 0, fg = 0, rects, color, flags, xy, wh;
 230     const int bpp = c->bpp2;
 231     uint8_t *dst2;
 232     int bw = 16, bh = 16;
 233     const uint8_t *ssrc=src;
 234
 235     for(j = 0; j < h; j += 16) {
 236         dst2 = dst;
 237         bw = 16;
 238         if(j + 16 > h) bh = h - j;
 239         for(i = 0; i < w; i += 16, dst2 += 16 * bpp) {
 240             if(src - ssrc >= ssize) {
 241                 av_log(c->avctx, AV_LOG_ERROR, "Premature end of data!\n");
 242                 return -1;
 243             }
 244             if(i + 16 > w) bw = w - i;
 245             flags = *src++;
 246             if(flags & HT_RAW) {
 247                 if(src - ssrc > ssize - bw * bh * bpp) {
 248                     av_log(c->avctx, AV_LOG_ERROR, "Premature end of data!\n");
 249                     return -1;
 250                 }
 251                 paint_raw(dst2, bw, bh, src, bpp, c->bigendian, stride);
 252                 src += bw * bh * bpp;
 253             } else {
 254                 if(flags & HT_BKG) {
 255                     bg = vmnc_get_pixel(src, bpp, c->bigendian); src += bpp;
 256                 }
 257                 if(flags & HT_FG) {
 258                     fg = vmnc_get_pixel(src, bpp, c->bigendian); src += bpp;
 259                 }
 260                 rects = 0;
 261                 if(flags & HT_SUB)
 262                     rects = *src++;
 263                 color = !!(flags & HT_CLR);
 264
 265                 paint_rect(dst2, 0, 0, bw, bh, bg, bpp, stride);
 266
 267                 if(src - ssrc > ssize - rects * (color * bpp + 2)) {
 268                     av_log(c->avctx, AV_LOG_ERROR, "Premature end of data!\n");
 269                     return -1;
 270                 }
 271                 for(k = 0; k < rects; k++) {
 272                     if(color) {
 273                         fg = vmnc_get_pixel(src, bpp, c->bigendian); src += bpp;
 274                     }
 275                     xy = *src++;
 276                     wh = *src++;
 277                     paint_rect(dst2, xy >> 4, xy & 0xF, (wh>>4)+1, (wh & 0xF)+1, fg, bpp, stride);
 278                 }
 279             }
 280         }
 281         dst += stride * 16;
 282     }
 283     return src - ssrc;
 284 }
 285
 286 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, const uint8_t *buf, int buf_size)
 287 {
 288     VmncContext * const c = avctx->priv_data;
 289     uint8_t *outptr;
 290     const uint8_t *src = buf;
 291     int dx, dy, w, h, depth, enc, chunks, res, size_left;
 292
 293     c->pic.reference = 1;
 294     c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
 295     if(avctx->reget_buffer(avctx, &c->pic) < 0){
 296         av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
 297         return -1;
 298     }
 299
 300     c->pic.key_frame = 0;
 301     c->pic.pict_type = FF_P_TYPE;
 302
 303     //restore screen after cursor
 304     if(c->screendta) {
 305         int i;
 306         w = c->cur_w;
 307         if(c->width < c->cur_x + w) w = c->width - c->cur_x;
 308         h = c->cur_h;
 309         if(c->height < c->cur_y + h) h = c->height - c->cur_y;
 310         dx = c->cur_x;
 311         if(dx < 0) {
 312             w += dx;
 313             dx = 0;
 314         }
 315         dy = c->cur_y;
 316         if(dy < 0) {
 317             h += dy;
 318             dy = 0;
 319         }
 320         if((w > 0) && (h > 0)) {
 321             outptr = c->pic.data[0] + dx * c->bpp2 + dy * c->pic.linesize[0];
 322             for(i = 0; i < h; i++) {
 323                 memcpy(outptr, c->screendta + i * c->cur_w * c->bpp2, w * c->bpp2);
 324                 outptr += c->pic.linesize[0];
 325             }
 326         }
 327     }
 328     src += 2;
 329     chunks = AV_RB16(src); src += 2;
 330     while(chunks--) {
 331         dx = AV_RB16(src); src += 2;
 332         dy = AV_RB16(src); src += 2;
 333         w  = AV_RB16(src); src += 2;
 334         h  = AV_RB16(src); src += 2;
 335         enc = AV_RB32(src); src += 4;
 336         outptr = c->pic.data[0] + dx * c->bpp2 + dy * c->pic.linesize[0];
 337         size_left = buf_size - (src - buf);
 338         switch(enc) {
 339         case MAGIC_WMVd: // cursor
 340             if(size_left < 2 + w * h * c->bpp2 * 2) {
 341                 av_log(avctx, AV_LOG_ERROR, "Premature end of data! (need %i got %i)\n", 2 + w * h * c->bpp2 * 2, size_left);
 342                 return -1;
 343             }
 344             src += 2;
 345             c->cur_w = w;
 346             c->cur_h = h;
 347             c->cur_hx = dx;
 348             c->cur_hy = dy;
 349             if((c->cur_hx > c->cur_w) || (c->cur_hy > c->cur_h)) {
 350                 av_log(avctx, AV_LOG_ERROR, "Cursor hot spot is not in image: %ix%i of %ix%i cursor size\n", c->cur_hx, c->cur_hy, c->cur_w, c->cur_h);
 351                 c->cur_hx = c->cur_hy = 0;
 352             }
 353             c->curbits = av_realloc(c->curbits, c->cur_w * c->cur_h * c->bpp2);
 354             c->curmask = av_realloc(c->curmask, c->cur_w * c->cur_h * c->bpp2);
 355             c->screendta = av_realloc(c->screendta, c->cur_w * c->cur_h * c->bpp2);
 356             load_cursor(c, src);
 357             src += w * h * c->bpp2 * 2;
 358             break;
 359         case MAGIC_WMVe: // unknown
 360             src += 2;
 361             break;
 362         case MAGIC_WMVf: // update cursor position
 363             c->cur_x = dx - c->cur_hx;
 364             c->cur_y = dy - c->cur_hy;
 365             break;
 366         case MAGIC_WMVg: // unknown
 367             src += 10;
 368             break;
 369         case MAGIC_WMVh: // unknown
 370             src += 4;
 371             break;
 372         case MAGIC_WMVi: // ServerInitialization struct
 373             c->pic.key_frame = 1;
 374             c->pic.pict_type = FF_I_TYPE;
 375             depth = *src++;
 376             if(depth != c->bpp) {
 377                 av_log(avctx, AV_LOG_INFO, "Depth mismatch. Container %i bpp, Frame data: %i bpp\n", c->bpp, depth);
 378             }
 379             src++;
 380             c->bigendian = *src++;
 381             if(c->bigendian & (~1)) {
 382                 av_log(avctx, AV_LOG_INFO, "Invalid header: bigendian flag = %i\n", c->bigendian);
 383                 return -1;
 384             }
 385             //skip the rest of pixel format data
 386             src += 13;
 387             break;
 388         case MAGIC_WMVj: // unknown
 389             src += 2;
 390             break;
 391         case 0x00000000: // raw rectangle data
 392             if((dx + w > c->width) || (dy + h > c->height)) {
 393                 av_log(avctx, AV_LOG_ERROR, "Incorrect frame size: %ix%i+%ix%i of %ix%i\n", w, h, dx, dy, c->width, c->height);
 394                 return -1;
 395             }
 396             if(size_left < w * h * c->bpp2) {
 397                 av_log(avctx, AV_LOG_ERROR, "Premature end of data! (need %i got %i)\n", w * h * c->bpp2, size_left);
 398                 return -1;
 399             }
 400             paint_raw(outptr, w, h, src, c->bpp2, c->bigendian, c->pic.linesize[0]);
 401             src += w * h * c->bpp2;
 402             break;
 403         case 0x00000005: // HexTile encoded rectangle
 404             if((dx + w > c->width) || (dy + h > c->height)) {
 405                 av_log(avctx, AV_LOG_ERROR, "Incorrect frame size: %ix%i+%ix%i of %ix%i\n", w, h, dx, dy, c->width, c->height);
 406                 return -1;
 407             }
 408             res = decode_hextile(c, outptr, src, size_left, w, h, c->pic.linesize[0]);
 409             if(res < 0)
 410                 return -1;
 411             src += res;
 412             break;
 413         default:
 414             av_log(avctx, AV_LOG_ERROR, "Unsupported block type 0x%08X\n", enc);
 415             chunks = 0; // leave chunks decoding loop
 416         }
 417     }
 418     if(c->screendta){
 419         int i;
 420         //save screen data before painting cursor
 421         w = c->cur_w;
 422         if(c->width < c->cur_x + w) w = c->width - c->cur_x;
 423         h = c->cur_h;
 424         if(c->height < c->cur_y + h) h = c->height - c->cur_y;
 425         dx = c->cur_x;
 426         if(dx < 0) {
 427             w += dx;
 428             dx = 0;
 429         }
 430         dy = c->cur_y;
 431         if(dy < 0) {
 432             h += dy;
 433             dy = 0;
 434         }
 435         if((w > 0) && (h > 0)) {
 436             outptr = c->pic.data[0] + dx * c->bpp2 + dy * c->pic.linesize[0];
 437             for(i = 0; i < h; i++) {
 438                 memcpy(c->screendta + i * c->cur_w * c->bpp2, outptr, w * c->bpp2);
 439                 outptr += c->pic.linesize[0];
 440             }
 441             outptr = c->pic.data[0];
 442             put_cursor(outptr, c->pic.linesize[0], c, c->cur_x, c->cur_y);
 443         }
 444     }
 445     *data_size = sizeof(AVFrame);
 446     *(AVFrame*)data = c->pic;
 447
 448     /* always report that the buffer was completely consumed */
 449     return buf_size;
 450 }
 451
 452
 453
 454 /*
 455  *
 456  * Init VMnc decoder
 457  *
 458  */
 459 static av_cold int decode_init(AVCodecContext *avctx)
 460 {
 461     VmncContext * const c = avctx->priv_data;
 462
 463     c->avctx = avctx;
 464
 465     c->pic.data[0] = NULL;
 466     c->width = avctx->width;
 467     c->height = avctx->height;
 468
 469     if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
 470         return 1;
 471     }
 472     c->bpp = avctx->bits_per_sample;
 473     c->bpp2 = c->bpp/8;
 474
 475     switch(c->bpp){
 476     case 8:
 477         avctx->pix_fmt = PIX_FMT_PAL8;
 478         break;
 479     case 16:
 480         avctx->pix_fmt = PIX_FMT_RGB555;
 481         break;
 482     case 32:
 483         avctx->pix_fmt = PIX_FMT_RGB32;
 484         break;
 485     default:
 486         av_log(avctx, AV_LOG_ERROR, "Unsupported bitdepth %i\n", c->bpp);
 487     }
 488
 489     return 0;
 490 }
 491
 492
 493
 494 /*
 495  *
 496  * Uninit VMnc decoder
 497  *
 498  */
 499 static av_cold int decode_end(AVCodecContext *avctx)
 500 {
 501     VmncContext * const c = avctx->priv_data;
 502
 503     if (c->pic.data[0])
 504         avctx->release_buffer(avctx, &c->pic);
 505
 506     av_free(c->curbits);
 507     av_free(c->curmask);
 508     av_free(c->screendta);
 509     return 0;
 510 }
 511
 512 AVCodec vmnc_decoder = {
 513     "vmnc",
 514     CODEC_TYPE_VIDEO,
 515     CODEC_ID_VMNC,
 516     sizeof(VmncContext),
 517     decode_init,
 518     NULL,
 519     decode_end,
 520     decode_frame,
 521     .long_name = NULL_IF_CONFIG_SMALL("VMware Screen Codec / VMware Video"),
 522 };
 523