2 * VMware Screen Codec (VMnc) decoder
3 * Copyright (c) 2006 Konstantin Shishkov
5 * This file is part of Libav.
7 * Libav 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.
12 * Libav 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.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * VMware Screen Codec (VMnc) decoder
25 * As Alex Beregszaszi discovered, this is effectively RFB data dump
31 #include "libavutil/intreadwrite.h"
35 MAGIC_WMVd = 0x574D5664,
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
55 typedef struct VmncContext {
56 AVCodecContext *avctx;
69 uint8_t* curbits, *curmask;
73 /* read pixel value from stream */
74 static av_always_inline int vmnc_get_pixel(const uint8_t* buf, int bpp, int be) {
75 switch(bpp * 2 + be) {
78 case 4: return AV_RL16(buf);
79 case 5: return AV_RB16(buf);
80 case 8: return AV_RL32(buf);
81 case 9: return AV_RB32(buf);
86 static void load_cursor(VmncContext *c, const uint8_t *src)
89 const int bpp = c->bpp2;
90 uint8_t *dst8 = c->curbits;
91 uint16_t *dst16 = (uint16_t*)c->curbits;
92 uint32_t *dst32 = (uint32_t*)c->curbits;
94 for(j = 0; j < c->cur_h; j++) {
95 for(i = 0; i < c->cur_w; i++) {
96 p = vmnc_get_pixel(src, bpp, c->bigendian);
98 if(bpp == 1) *dst8++ = p;
99 if(bpp == 2) *dst16++ = p;
100 if(bpp == 4) *dst32++ = p;
104 dst16 = (uint16_t*)c->curmask;
105 dst32 = (uint32_t*)c->curmask;
106 for(j = 0; j < c->cur_h; j++) {
107 for(i = 0; i < c->cur_w; i++) {
108 p = vmnc_get_pixel(src, bpp, c->bigendian);
110 if(bpp == 1) *dst8++ = p;
111 if(bpp == 2) *dst16++ = p;
112 if(bpp == 4) *dst32++ = p;
117 static void put_cursor(uint8_t *dst, int stride, VmncContext *c, int dx, int dy)
122 if(c->width < c->cur_x + c->cur_w) w = c->width - c->cur_x;
124 if(c->height < c->cur_y + c->cur_h) h = c->height - c->cur_y;
136 if((w < 1) || (h < 1)) return;
137 dst += x * c->bpp2 + y * stride;
140 uint8_t* cd = c->curbits, *msk = c->curmask;
141 for(j = 0; j < h; j++) {
142 for(i = 0; i < w; i++)
143 dst[i] = (dst[i] & cd[i]) ^ msk[i];
148 } else if(c->bpp2 == 2) {
149 uint16_t* cd = (uint16_t*)c->curbits, *msk = (uint16_t*)c->curmask;
151 for(j = 0; j < h; j++) {
152 dst2 = (uint16_t*)dst;
153 for(i = 0; i < w; i++)
154 dst2[i] = (dst2[i] & cd[i]) ^ msk[i];
159 } else if(c->bpp2 == 4) {
160 uint32_t* cd = (uint32_t*)c->curbits, *msk = (uint32_t*)c->curmask;
162 for(j = 0; j < h; j++) {
163 dst2 = (uint32_t*)dst;
164 for(i = 0; i < w; i++)
165 dst2[i] = (dst2[i] & cd[i]) ^ msk[i];
173 /* fill rectangle with given color */
174 static av_always_inline void paint_rect(uint8_t *dst, int dx, int dy, int w, int h, int color, int bpp, int stride)
177 dst += dx * bpp + dy * stride;
179 for(j = 0; j < h; j++) {
180 memset(dst, color, w);
185 for(j = 0; j < h; j++) {
186 dst2 = (uint16_t*)dst;
187 for(i = 0; i < w; i++) {
194 for(j = 0; j < h; j++) {
195 dst2 = (uint32_t*)dst;
196 for(i = 0; i < w; i++) {
204 static av_always_inline void paint_raw(uint8_t *dst, int w, int h, const uint8_t* src, int bpp, int be, int stride)
207 for(j = 0; j < h; j++) {
208 for(i = 0; i < w; i++) {
209 p = vmnc_get_pixel(src, bpp, be);
216 ((uint16_t*)dst)[i] = p;
219 ((uint32_t*)dst)[i] = p;
227 static int decode_hextile(VmncContext *c, uint8_t* dst, const uint8_t* src, int ssize, int w, int h, int stride)
230 int bg = 0, fg = 0, rects, color, flags, xy, wh;
231 const int bpp = c->bpp2;
233 int bw = 16, bh = 16;
234 const uint8_t *ssrc=src;
236 for(j = 0; j < h; j += 16) {
239 if(j + 16 > h) bh = h - j;
240 for(i = 0; i < w; i += 16, dst2 += 16 * bpp) {
241 if(src - ssrc >= ssize) {
242 av_log(c->avctx, AV_LOG_ERROR, "Premature end of data!\n");
245 if(i + 16 > w) bw = w - i;
248 if(src - ssrc > ssize - bw * bh * bpp) {
249 av_log(c->avctx, AV_LOG_ERROR, "Premature end of data!\n");
252 paint_raw(dst2, bw, bh, src, bpp, c->bigendian, stride);
253 src += bw * bh * bpp;
256 bg = vmnc_get_pixel(src, bpp, c->bigendian); src += bpp;
259 fg = vmnc_get_pixel(src, bpp, c->bigendian); src += bpp;
264 color = !!(flags & HT_CLR);
266 paint_rect(dst2, 0, 0, bw, bh, bg, bpp, stride);
268 if(src - ssrc > ssize - rects * (color * bpp + 2)) {
269 av_log(c->avctx, AV_LOG_ERROR, "Premature end of data!\n");
272 for(k = 0; k < rects; k++) {
274 fg = vmnc_get_pixel(src, bpp, c->bigendian); src += bpp;
278 paint_rect(dst2, xy >> 4, xy & 0xF, (wh>>4)+1, (wh & 0xF)+1, fg, bpp, stride);
287 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
289 const uint8_t *buf = avpkt->data;
290 int buf_size = avpkt->size;
291 VmncContext * const c = avctx->priv_data;
293 const uint8_t *src = buf;
294 int dx, dy, w, h, depth, enc, chunks, res, size_left;
296 c->pic.reference = 1;
297 c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
298 if(avctx->reget_buffer(avctx, &c->pic) < 0){
299 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
303 c->pic.key_frame = 0;
304 c->pic.pict_type = AV_PICTURE_TYPE_P;
306 //restore screen after cursor
310 if(c->width < c->cur_x + w) w = c->width - c->cur_x;
312 if(c->height < c->cur_y + h) h = c->height - c->cur_y;
323 if((w > 0) && (h > 0)) {
324 outptr = c->pic.data[0] + dx * c->bpp2 + dy * c->pic.linesize[0];
325 for(i = 0; i < h; i++) {
326 memcpy(outptr, c->screendta + i * c->cur_w * c->bpp2, w * c->bpp2);
327 outptr += c->pic.linesize[0];
332 chunks = AV_RB16(src); src += 2;
334 dx = AV_RB16(src); src += 2;
335 dy = AV_RB16(src); src += 2;
336 w = AV_RB16(src); src += 2;
337 h = AV_RB16(src); src += 2;
338 enc = AV_RB32(src); src += 4;
339 outptr = c->pic.data[0] + dx * c->bpp2 + dy * c->pic.linesize[0];
340 size_left = buf_size - (src - buf);
342 case MAGIC_WMVd: // cursor
343 if(size_left < 2 + w * h * c->bpp2 * 2) {
344 av_log(avctx, AV_LOG_ERROR, "Premature end of data! (need %i got %i)\n", 2 + w * h * c->bpp2 * 2, size_left);
352 if((c->cur_hx > c->cur_w) || (c->cur_hy > c->cur_h)) {
353 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);
354 c->cur_hx = c->cur_hy = 0;
356 c->curbits = av_realloc(c->curbits, c->cur_w * c->cur_h * c->bpp2);
357 c->curmask = av_realloc(c->curmask, c->cur_w * c->cur_h * c->bpp2);
358 c->screendta = av_realloc(c->screendta, c->cur_w * c->cur_h * c->bpp2);
360 src += w * h * c->bpp2 * 2;
362 case MAGIC_WMVe: // unknown
365 case MAGIC_WMVf: // update cursor position
366 c->cur_x = dx - c->cur_hx;
367 c->cur_y = dy - c->cur_hy;
369 case MAGIC_WMVg: // unknown
372 case MAGIC_WMVh: // unknown
375 case MAGIC_WMVi: // ServerInitialization struct
376 c->pic.key_frame = 1;
377 c->pic.pict_type = AV_PICTURE_TYPE_I;
379 if(depth != c->bpp) {
380 av_log(avctx, AV_LOG_INFO, "Depth mismatch. Container %i bpp, Frame data: %i bpp\n", c->bpp, depth);
383 c->bigendian = *src++;
384 if(c->bigendian & (~1)) {
385 av_log(avctx, AV_LOG_INFO, "Invalid header: bigendian flag = %i\n", c->bigendian);
388 //skip the rest of pixel format data
391 case MAGIC_WMVj: // unknown
394 case 0x00000000: // raw rectangle data
395 if((dx + w > c->width) || (dy + h > c->height)) {
396 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);
399 if(size_left < w * h * c->bpp2) {
400 av_log(avctx, AV_LOG_ERROR, "Premature end of data! (need %i got %i)\n", w * h * c->bpp2, size_left);
403 paint_raw(outptr, w, h, src, c->bpp2, c->bigendian, c->pic.linesize[0]);
404 src += w * h * c->bpp2;
406 case 0x00000005: // HexTile encoded rectangle
407 if((dx + w > c->width) || (dy + h > c->height)) {
408 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);
411 res = decode_hextile(c, outptr, src, size_left, w, h, c->pic.linesize[0]);
417 av_log(avctx, AV_LOG_ERROR, "Unsupported block type 0x%08X\n", enc);
418 chunks = 0; // leave chunks decoding loop
423 //save screen data before painting cursor
425 if(c->width < c->cur_x + w) w = c->width - c->cur_x;
427 if(c->height < c->cur_y + h) h = c->height - c->cur_y;
438 if((w > 0) && (h > 0)) {
439 outptr = c->pic.data[0] + dx * c->bpp2 + dy * c->pic.linesize[0];
440 for(i = 0; i < h; i++) {
441 memcpy(c->screendta + i * c->cur_w * c->bpp2, outptr, w * c->bpp2);
442 outptr += c->pic.linesize[0];
444 outptr = c->pic.data[0];
445 put_cursor(outptr, c->pic.linesize[0], c, c->cur_x, c->cur_y);
448 *data_size = sizeof(AVFrame);
449 *(AVFrame*)data = c->pic;
451 /* always report that the buffer was completely consumed */
462 static av_cold int decode_init(AVCodecContext *avctx)
464 VmncContext * const c = avctx->priv_data;
468 c->width = avctx->width;
469 c->height = avctx->height;
471 c->bpp = avctx->bits_per_coded_sample;
476 avctx->pix_fmt = PIX_FMT_PAL8;
479 avctx->pix_fmt = PIX_FMT_RGB555;
482 avctx->pix_fmt = PIX_FMT_RGB32;
485 av_log(avctx, AV_LOG_ERROR, "Unsupported bitdepth %i\n", c->bpp);
486 return AVERROR_INVALIDDATA;
496 * Uninit VMnc decoder
499 static av_cold int decode_end(AVCodecContext *avctx)
501 VmncContext * const c = avctx->priv_data;
504 avctx->release_buffer(avctx, &c->pic);
508 av_free(c->screendta);
512 AVCodec ff_vmnc_decoder = {
514 .type = AVMEDIA_TYPE_VIDEO,
516 .priv_data_size = sizeof(VmncContext),
519 .decode = decode_frame,
520 .capabilities = CODEC_CAP_DR1,
521 .long_name = NULL_IF_CONFIG_SMALL("VMware Screen Codec / VMware Video"),