mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 6171 to svn://svn.ffmpeg.org/ffmpeg/trunkpull/126/head
Kostya Shishkov
19 years ago
parent
353e433b96
commit
eb57c88973
8 changed files with 338 additions and 2 deletions
@ -0,0 +1,326 @@ |
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/*
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* VMware Screen Codec (VMnc) decoder |
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* Copyright (c) 2006 Konstantin Shishkov |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2 of the License, or (at your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with this library; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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* |
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*/ |
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/**
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* @file vmnc.c |
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* VMware Screen Codec (VMnc) decoder |
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* As Alex Beregszaszi discovered, this is effectively RFB data dump |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include "common.h" |
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#include "avcodec.h" |
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#define MAGIC_WMVi 0x574D5669 |
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enum HexTile_Flags { |
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HT_RAW = 1, // tile is raw
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HT_BKG = 2, // background color is present
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HT_FG = 4, // foreground color is present
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HT_SUB = 8, // subrects are present
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HT_CLR = 16 // each subrect has own color
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}; |
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/*
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* Decoder context |
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*/ |
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typedef struct VmncContext { |
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AVCodecContext *avctx; |
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AVFrame pic; |
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int bpp; |
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int bpp2; |
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int bigendian; |
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uint8_t pal[768]; |
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int width, height; |
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} VmncContext; |
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/* read pixel value from stream */ |
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static always_inline int vmnc_get_pixel(uint8_t* buf, int bpp, int be) { |
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switch(bpp * 2 + be) { |
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case 2: |
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case 3: return *buf; |
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case 4: return LE_16(buf); |
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case 5: return BE_16(buf); |
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case 8: return LE_32(buf); |
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case 9: return BE_32(buf); |
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default: return 0; |
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} |
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} |
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/* fill rectangle with given colour */ |
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static always_inline void paint_rect(uint8_t *dst, int dx, int dy, int w, int h, int color, int bpp, int stride) |
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{ |
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int i, j; |
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dst += dx * bpp + dy * stride; |
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if(bpp == 1){ |
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for(j = 0; j < h; j++) { |
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memset(dst, color, w); |
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dst += stride; |
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} |
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}else if(bpp == 2){ |
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uint16_t* dst2; |
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for(j = 0; j < h; j++) { |
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dst2 = (uint16_t*)dst; |
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for(i = 0; i < w; i++) { |
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*dst2++ = color; |
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} |
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dst += stride; |
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} |
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}else if(bpp == 4){ |
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uint32_t* dst2; |
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for(j = 0; j < h; j++) { |
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dst2 = (uint32_t*)dst; |
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for(i = 0; i < w; i++) { |
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dst2[i] = color; |
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} |
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dst += stride; |
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} |
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} |
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} |
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static always_inline void paint_raw(uint8_t *dst, int w, int h, uint8_t* src, int bpp, int be, int stride) |
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{ |
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int i, j, p; |
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for(j = 0; j < h; j++) { |
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for(i = 0; i < w; i++) { |
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p = vmnc_get_pixel(src, bpp, be); |
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src += bpp; |
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memcpy(dst + i*bpp, &p, bpp); |
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} |
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dst += stride; |
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} |
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} |
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static int decode_hextile(VmncContext *c, uint8_t* dst, uint8_t* src, int w, int h, int stride) |
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{ |
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int i, j, k; |
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int bg = 0, fg = 0, rects, color, flags, xy, wh; |
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const int bpp = c->bpp2; |
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uint8_t *dst2; |
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int bw = 16, bh = 16; |
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uint8_t *ssrc=src; |
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for(j = 0; j < h; j += 16) { |
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dst2 = dst; |
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bw = 16; |
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if(j + 16 > h) bh = h - j; |
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for(i = 0; i < w; i += 16, dst2 += 16 * bpp) { |
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if(i + 16 > w) bw = w - i; |
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flags = *src++; |
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if(flags & HT_RAW) { |
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paint_raw(dst2, bw, bh, src, bpp, c->bigendian, stride); |
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} else { |
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if(flags & HT_BKG) { |
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bg = vmnc_get_pixel(src, bpp, c->bigendian); src += bpp; |
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} |
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if(flags & HT_FG) { |
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fg = vmnc_get_pixel(src, bpp, c->bigendian); src += bpp; |
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} |
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rects = 0; |
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if(flags & HT_SUB) |
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rects = *src++; |
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color = (flags & HT_CLR); |
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paint_rect(dst2, 0, 0, bw, bh, bg, bpp, stride); |
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for(k = 0; k < rects; k++) { |
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if(color) { |
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fg = vmnc_get_pixel(src, bpp, c->bigendian); src += bpp; |
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} |
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xy = *src++; |
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wh = *src++; |
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paint_rect(dst2, xy >> 4, xy & 0xF, (wh>>4)+1, (wh & 0xF)+1, fg, bpp, stride); |
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} |
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} |
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} |
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dst += stride * 16; |
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} |
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return src - ssrc; |
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} |
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static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size) |
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{ |
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VmncContext * const c = (VmncContext *)avctx->priv_data; |
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uint8_t *outptr; |
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uint8_t *src = buf; |
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int t, dx, dy, w, h, enc, chunks, res; |
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c->pic.reference = 1; |
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c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE; |
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if(avctx->reget_buffer(avctx, &c->pic) < 0){ |
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av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); |
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return -1; |
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} |
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t = BE_32(src); |
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src += 4; |
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chunks = t & 0xFF; |
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if(chunks > 8) { |
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av_log(avctx, AV_LOG_ERROR, "Frame decoding is not possible. Please report sample to developers.\n"); |
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return -1; |
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} |
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if(chunks == 8) { |
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int w, h, depth; |
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c->pic.key_frame = 1; |
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c->pic.pict_type = FF_I_TYPE; |
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/* parse ServerInitialization struct */ |
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src += 4; |
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w = BE_16(src); src += 2; |
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h = BE_16(src); src += 2; |
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t = BE_32(src); src += 4; |
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if(t != MAGIC_WMVi) { |
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av_log(avctx, AV_LOG_INFO, "Invalid header: magic not found\n"); |
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return -1; |
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} |
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depth = *src++; |
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if(depth != c->bpp) { |
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av_log(avctx, AV_LOG_INFO, "Depth mismatch. Container %i bpp, Frame data: %i bpp\n", c->bpp, depth); |
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} |
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src++; |
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c->bigendian = *src++; |
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if(c->bigendian & (~1)) { |
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av_log(avctx, AV_LOG_INFO, "Invalid header: bigendian flag = %i\n", c->bigendian); |
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return -1; |
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} |
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//skip pixel format data
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src += 13; |
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chunks = 1; // there should be one chunk with the whole frame, rest could be ignored
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} else { |
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c->pic.key_frame = 0; |
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c->pic.pict_type = FF_P_TYPE; |
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} |
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while(chunks--) { |
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// decode FramebufferUpdate struct
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dx = BE_16(src); src += 2; |
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dy = BE_16(src); src += 2; |
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w = BE_16(src); src += 2; |
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h = BE_16(src); src += 2; |
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if((dx + w > c->width) || (dy + h > c->height)) { |
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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); |
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return -1; |
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} |
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enc = BE_32(src); src += 4; |
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if(enc != 0x00000005) { |
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av_log(avctx, AV_LOG_ERROR, "Only hextile decoding is supported for now\n"); |
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switch(enc) { |
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case 0: |
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av_log(avctx, AV_LOG_INFO, "And this is raw encoding\n"); |
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break; |
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case 1: |
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av_log(avctx, AV_LOG_INFO, "And this is CopyRect encoding\n"); |
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break; |
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case 2: |
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av_log(avctx, AV_LOG_INFO, "And this is RRE encoding\n"); |
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break; |
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case 3: |
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av_log(avctx, AV_LOG_INFO, "And this is CoRRE encoding\n"); |
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break; |
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default: |
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av_log(avctx, AV_LOG_INFO, "And this is unknown encoding (%i)\n", enc); |
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} |
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return -1; |
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} |
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outptr = c->pic.data[0] + dx * c->bpp2 + dy * c->pic.linesize[0]; |
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res = decode_hextile(c, outptr, src, w, h, c->pic.linesize[0]); |
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if(res < 0) |
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return -1; |
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src += res; |
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} |
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*data_size = sizeof(AVFrame); |
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*(AVFrame*)data = c->pic; |
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/* always report that the buffer was completely consumed */ |
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return buf_size; |
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} |
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/*
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* |
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* Init VMnc decoder |
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* |
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*/ |
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static int decode_init(AVCodecContext *avctx) |
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{ |
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VmncContext * const c = (VmncContext *)avctx->priv_data; |
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c->avctx = avctx; |
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avctx->has_b_frames = 0; |
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c->pic.data[0] = NULL; |
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c->width = avctx->width; |
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c->height = avctx->height; |
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if (avcodec_check_dimensions(avctx, avctx->height, avctx->width) < 0) { |
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return 1; |
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} |
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c->bpp = avctx->bits_per_sample; |
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c->bpp2 = c->bpp/8; |
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switch(c->bpp){ |
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case 8: |
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avctx->pix_fmt = PIX_FMT_PAL8; |
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break; |
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case 16: |
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avctx->pix_fmt = PIX_FMT_RGB555; |
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break; |
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case 32: |
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avctx->pix_fmt = PIX_FMT_RGB32; |
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break; |
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default: |
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av_log(avctx, AV_LOG_ERROR, "Unsupported bitdepth %i\n", c->bpp); |
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} |
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return 0; |
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} |
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/*
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* |
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* Uninit VMnc decoder |
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* |
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*/ |
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static int decode_end(AVCodecContext *avctx) |
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{ |
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VmncContext * const c = (VmncContext *)avctx->priv_data; |
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if (c->pic.data[0]) |
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avctx->release_buffer(avctx, &c->pic); |
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return 0; |
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} |
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AVCodec vmnc_decoder = { |
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"VMware video", |
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CODEC_TYPE_VIDEO, |
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CODEC_ID_VMNC, |
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sizeof(VmncContext), |
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decode_init, |
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NULL, |
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decode_end, |
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decode_frame |
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}; |
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