/* * VMware Screen Codec (VMnc) decoder * Copyright (c) 2006 Konstantin Shishkov * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * VMware Screen Codec (VMnc) decoder * As Alex Beregszaszi discovered, this is effectively RFB data dump */ #include <stdio.h> #include <stdlib.h> #include "libavutil/common.h" #include "libavutil/intreadwrite.h" #include "avcodec.h" #include "internal.h" enum EncTypes { MAGIC_WMVd = 0x574D5664, MAGIC_WMVe, MAGIC_WMVf, MAGIC_WMVg, MAGIC_WMVh, MAGIC_WMVi, MAGIC_WMVj }; enum HexTile_Flags { HT_RAW = 1, // tile is raw HT_BKG = 2, // background color is present HT_FG = 4, // foreground color is present HT_SUB = 8, // subrects are present HT_CLR = 16 // each subrect has own color }; /* * Decoder context */ typedef struct VmncContext { AVCodecContext *avctx; AVFrame pic; int bpp; int bpp2; int bigendian; uint8_t pal[768]; int width, height; /* cursor data */ int cur_w, cur_h; int cur_x, cur_y; int cur_hx, cur_hy; uint8_t* curbits, *curmask; uint8_t* screendta; } VmncContext; /* read pixel value from stream */ static av_always_inline int vmnc_get_pixel(const uint8_t* buf, int bpp, int be) { switch(bpp * 2 + be) { case 2: case 3: return *buf; case 4: return AV_RL16(buf); case 5: return AV_RB16(buf); case 8: return AV_RL32(buf); case 9: return AV_RB32(buf); default: return 0; } } static void load_cursor(VmncContext *c, const uint8_t *src) { int i, j, p; const int bpp = c->bpp2; uint8_t *dst8 = c->curbits; uint16_t *dst16 = (uint16_t*)c->curbits; uint32_t *dst32 = (uint32_t*)c->curbits; for(j = 0; j < c->cur_h; j++) { for(i = 0; i < c->cur_w; i++) { p = vmnc_get_pixel(src, bpp, c->bigendian); src += bpp; if(bpp == 1) *dst8++ = p; if(bpp == 2) *dst16++ = p; if(bpp == 4) *dst32++ = p; } } dst8 = c->curmask; dst16 = (uint16_t*)c->curmask; dst32 = (uint32_t*)c->curmask; for(j = 0; j < c->cur_h; j++) { for(i = 0; i < c->cur_w; i++) { p = vmnc_get_pixel(src, bpp, c->bigendian); src += bpp; if(bpp == 1) *dst8++ = p; if(bpp == 2) *dst16++ = p; if(bpp == 4) *dst32++ = p; } } } static void put_cursor(uint8_t *dst, int stride, VmncContext *c, int dx, int dy) { int i, j; int w, h, x, y; w = c->cur_w; if(c->width < c->cur_x + c->cur_w) w = c->width - c->cur_x; h = c->cur_h; if(c->height < c->cur_y + c->cur_h) h = c->height - c->cur_y; x = c->cur_x; y = c->cur_y; if(x < 0) { w += x; x = 0; } if(y < 0) { h += y; y = 0; } if((w < 1) || (h < 1)) return; dst += x * c->bpp2 + y * stride; if(c->bpp2 == 1) { uint8_t* cd = c->curbits, *msk = c->curmask; for(j = 0; j < h; j++) { for(i = 0; i < w; i++) dst[i] = (dst[i] & cd[i]) ^ msk[i]; msk += c->cur_w; cd += c->cur_w; dst += stride; } } else if(c->bpp2 == 2) { uint16_t* cd = (uint16_t*)c->curbits, *msk = (uint16_t*)c->curmask; uint16_t* dst2; for(j = 0; j < h; j++) { dst2 = (uint16_t*)dst; for(i = 0; i < w; i++) dst2[i] = (dst2[i] & cd[i]) ^ msk[i]; msk += c->cur_w; cd += c->cur_w; dst += stride; } } else if(c->bpp2 == 4) { uint32_t* cd = (uint32_t*)c->curbits, *msk = (uint32_t*)c->curmask; uint32_t* dst2; for(j = 0; j < h; j++) { dst2 = (uint32_t*)dst; for(i = 0; i < w; i++) dst2[i] = (dst2[i] & cd[i]) ^ msk[i]; msk += c->cur_w; cd += c->cur_w; dst += stride; } } } /* fill rectangle with given color */ static av_always_inline void paint_rect(uint8_t *dst, int dx, int dy, int w, int h, int color, int bpp, int stride) { int i, j; dst += dx * bpp + dy * stride; if(bpp == 1){ for(j = 0; j < h; j++) { memset(dst, color, w); dst += stride; } }else if(bpp == 2){ uint16_t* dst2; for(j = 0; j < h; j++) { dst2 = (uint16_t*)dst; for(i = 0; i < w; i++) { *dst2++ = color; } dst += stride; } }else if(bpp == 4){ uint32_t* dst2; for(j = 0; j < h; j++) { dst2 = (uint32_t*)dst; for(i = 0; i < w; i++) { dst2[i] = color; } dst += stride; } } } static av_always_inline void paint_raw(uint8_t *dst, int w, int h, const uint8_t* src, int bpp, int be, int stride) { int i, j, p; for(j = 0; j < h; j++) { for(i = 0; i < w; i++) { p = vmnc_get_pixel(src, bpp, be); src += bpp; switch(bpp){ case 1: dst[i] = p; break; case 2: ((uint16_t*)dst)[i] = p; break; case 4: ((uint32_t*)dst)[i] = p; break; } } dst += stride; } } static int decode_hextile(VmncContext *c, uint8_t* dst, const uint8_t* src, int ssize, int w, int h, int stride) { int i, j, k; int bg = 0, fg = 0, rects, color, flags, xy, wh; const int bpp = c->bpp2; uint8_t *dst2; int bw = 16, bh = 16; const uint8_t *ssrc=src; for(j = 0; j < h; j += 16) { dst2 = dst; bw = 16; if(j + 16 > h) bh = h - j; for(i = 0; i < w; i += 16, dst2 += 16 * bpp) { if(src - ssrc >= ssize) { av_log(c->avctx, AV_LOG_ERROR, "Premature end of data!\n"); return -1; } if(i + 16 > w) bw = w - i; flags = *src++; if(flags & HT_RAW) { if(src - ssrc > ssize - bw * bh * bpp) { av_log(c->avctx, AV_LOG_ERROR, "Premature end of data!\n"); return -1; } paint_raw(dst2, bw, bh, src, bpp, c->bigendian, stride); src += bw * bh * bpp; } else { if(flags & HT_BKG) { bg = vmnc_get_pixel(src, bpp, c->bigendian); src += bpp; } if(flags & HT_FG) { fg = vmnc_get_pixel(src, bpp, c->bigendian); src += bpp; } rects = 0; if(flags & HT_SUB) rects = *src++; color = !!(flags & HT_CLR); paint_rect(dst2, 0, 0, bw, bh, bg, bpp, stride); if(src - ssrc > ssize - rects * (color * bpp + 2)) { av_log(c->avctx, AV_LOG_ERROR, "Premature end of data!\n"); return -1; } for(k = 0; k < rects; k++) { if(color) { fg = vmnc_get_pixel(src, bpp, c->bigendian); src += bpp; } xy = *src++; wh = *src++; paint_rect(dst2, xy >> 4, xy & 0xF, (wh>>4)+1, (wh & 0xF)+1, fg, bpp, stride); } } } dst += stride * 16; } return src - ssrc; } static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; VmncContext * const c = avctx->priv_data; uint8_t *outptr; const uint8_t *src = buf; int dx, dy, w, h, depth, enc, chunks, res, size_left, ret; if ((ret = ff_reget_buffer(avctx, &c->pic)) < 0) return ret; c->pic.key_frame = 0; c->pic.pict_type = AV_PICTURE_TYPE_P; //restore screen after cursor if(c->screendta) { int i; w = c->cur_w; if(c->width < c->cur_x + w) w = c->width - c->cur_x; h = c->cur_h; if(c->height < c->cur_y + h) h = c->height - c->cur_y; dx = c->cur_x; if(dx < 0) { w += dx; dx = 0; } dy = c->cur_y; if(dy < 0) { h += dy; dy = 0; } if((w > 0) && (h > 0)) { outptr = c->pic.data[0] + dx * c->bpp2 + dy * c->pic.linesize[0]; for(i = 0; i < h; i++) { memcpy(outptr, c->screendta + i * c->cur_w * c->bpp2, w * c->bpp2); outptr += c->pic.linesize[0]; } } } src += 2; chunks = AV_RB16(src); src += 2; while(chunks--) { if(buf_size - (src - buf) < 12) { av_log(avctx, AV_LOG_ERROR, "Premature end of data!\n"); return -1; } dx = AV_RB16(src); src += 2; dy = AV_RB16(src); src += 2; w = AV_RB16(src); src += 2; h = AV_RB16(src); src += 2; enc = AV_RB32(src); src += 4; outptr = c->pic.data[0] + dx * c->bpp2 + dy * c->pic.linesize[0]; size_left = buf_size - (src - buf); switch(enc) { case MAGIC_WMVd: // cursor if (w*(int64_t)h*c->bpp2 > INT_MAX/2 - 2) { av_log(avctx, AV_LOG_ERROR, "dimensions too large\n"); return AVERROR_INVALIDDATA; } if(size_left < 2 + w * h * c->bpp2 * 2) { av_log(avctx, AV_LOG_ERROR, "Premature end of data! (need %i got %i)\n", 2 + w * h * c->bpp2 * 2, size_left); return -1; } src += 2; c->cur_w = w; c->cur_h = h; c->cur_hx = dx; c->cur_hy = dy; if((c->cur_hx > c->cur_w) || (c->cur_hy > c->cur_h)) { 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); c->cur_hx = c->cur_hy = 0; } c->curbits = av_realloc(c->curbits, c->cur_w * c->cur_h * c->bpp2); c->curmask = av_realloc(c->curmask, c->cur_w * c->cur_h * c->bpp2); c->screendta = av_realloc(c->screendta, c->cur_w * c->cur_h * c->bpp2); load_cursor(c, src); src += w * h * c->bpp2 * 2; break; case MAGIC_WMVe: // unknown src += 2; break; case MAGIC_WMVf: // update cursor position c->cur_x = dx - c->cur_hx; c->cur_y = dy - c->cur_hy; break; case MAGIC_WMVg: // unknown src += 10; break; case MAGIC_WMVh: // unknown src += 4; break; case MAGIC_WMVi: // ServerInitialization struct c->pic.key_frame = 1; c->pic.pict_type = AV_PICTURE_TYPE_I; depth = *src++; if(depth != c->bpp) { av_log(avctx, AV_LOG_INFO, "Depth mismatch. Container %i bpp, Frame data: %i bpp\n", c->bpp, depth); } src++; c->bigendian = *src++; if(c->bigendian & (~1)) { av_log(avctx, AV_LOG_INFO, "Invalid header: bigendian flag = %i\n", c->bigendian); return -1; } //skip the rest of pixel format data src += 13; break; case MAGIC_WMVj: // unknown src += 2; break; case 0x00000000: // raw rectangle data if((dx + w > c->width) || (dy + h > c->height)) { 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); return -1; } if(size_left < w * h * c->bpp2) { av_log(avctx, AV_LOG_ERROR, "Premature end of data! (need %i got %i)\n", w * h * c->bpp2, size_left); return -1; } paint_raw(outptr, w, h, src, c->bpp2, c->bigendian, c->pic.linesize[0]); src += w * h * c->bpp2; break; case 0x00000005: // HexTile encoded rectangle if((dx + w > c->width) || (dy + h > c->height)) { 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); return -1; } res = decode_hextile(c, outptr, src, size_left, w, h, c->pic.linesize[0]); if(res < 0) return -1; src += res; break; default: av_log(avctx, AV_LOG_ERROR, "Unsupported block type 0x%08X\n", enc); chunks = 0; // leave chunks decoding loop } } if(c->screendta){ int i; //save screen data before painting cursor w = c->cur_w; if(c->width < c->cur_x + w) w = c->width - c->cur_x; h = c->cur_h; if(c->height < c->cur_y + h) h = c->height - c->cur_y; dx = c->cur_x; if(dx < 0) { w += dx; dx = 0; } dy = c->cur_y; if(dy < 0) { h += dy; dy = 0; } if((w > 0) && (h > 0)) { outptr = c->pic.data[0] + dx * c->bpp2 + dy * c->pic.linesize[0]; for(i = 0; i < h; i++) { memcpy(c->screendta + i * c->cur_w * c->bpp2, outptr, w * c->bpp2); outptr += c->pic.linesize[0]; } outptr = c->pic.data[0]; put_cursor(outptr, c->pic.linesize[0], c, c->cur_x, c->cur_y); } } *got_frame = 1; if ((ret = av_frame_ref(data, &c->pic)) < 0) return ret; /* always report that the buffer was completely consumed */ return buf_size; } /* * * Init VMnc decoder * */ static av_cold int decode_init(AVCodecContext *avctx) { VmncContext * const c = avctx->priv_data; c->avctx = avctx; c->width = avctx->width; c->height = avctx->height; c->bpp = avctx->bits_per_coded_sample; c->bpp2 = c->bpp/8; avcodec_get_frame_defaults(&c->pic); switch(c->bpp){ case 8: avctx->pix_fmt = AV_PIX_FMT_PAL8; break; case 16: avctx->pix_fmt = AV_PIX_FMT_RGB555; break; case 32: avctx->pix_fmt = AV_PIX_FMT_RGB32; break; default: av_log(avctx, AV_LOG_ERROR, "Unsupported bitdepth %i\n", c->bpp); return AVERROR_INVALIDDATA; } avcodec_get_frame_defaults(&c->pic); return 0; } /* * * Uninit VMnc decoder * */ static av_cold int decode_end(AVCodecContext *avctx) { VmncContext * const c = avctx->priv_data; av_frame_unref(&c->pic); av_free(c->curbits); av_free(c->curmask); av_free(c->screendta); return 0; } AVCodec ff_vmnc_decoder = { .name = "vmnc", .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_VMNC, .priv_data_size = sizeof(VmncContext), .init = decode_init, .close = decode_end, .decode = decode_frame, .capabilities = CODEC_CAP_DR1, .long_name = NULL_IF_CONFIG_SMALL("VMware Screen Codec / VMware Video"), };