diff options
Diffstat (limited to 'libavcodec/vmnc.c')
| -rw-r--r-- | libavcodec/vmnc.c | 326 |
1 files changed, 326 insertions, 0 deletions
diff --git a/libavcodec/vmnc.c b/libavcodec/vmnc.c new file mode 100644 index 0000000000..8771891706 --- /dev/null +++ b/libavcodec/vmnc.c @@ -0,0 +1,326 @@ +/* + * VMware Screen Codec (VMnc) decoder + * Copyright (c) 2006 Konstantin Shishkov + * + * This library 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 of the License, or (at your option) any later version. + * + * This library 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 this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + * + */ + +/** + * @file vmnc.c + * VMware Screen Codec (VMnc) decoder + * As Alex Beregszaszi discovered, this is effectively RFB data dump + */ + +#include <stdio.h> +#include <stdlib.h> + +#include "common.h" +#include "avcodec.h" + +#define MAGIC_WMVi 0x574D5669 + +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; +} VmncContext; + +/* read pixel value from stream */ +static always_inline int vmnc_get_pixel(uint8_t* buf, int bpp, int be) { + switch(bpp * 2 + be) { + case 2: + case 3: return *buf; + case 4: return LE_16(buf); + case 5: return BE_16(buf); + case 8: return LE_32(buf); + case 9: return BE_32(buf); + default: return 0; + } +} + +/* fill rectangle with given colour */ +static 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 always_inline void paint_raw(uint8_t *dst, int w, int h, 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; + memcpy(dst + i*bpp, &p, bpp); + } + dst += stride; + } +} + +static int decode_hextile(VmncContext *c, uint8_t* dst, uint8_t* src, 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; + 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(i + 16 > w) bw = w - i; + flags = *src++; + if(flags & HT_RAW) { + paint_raw(dst2, bw, bh, src, bpp, c->bigendian, stride); + } 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); + + 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 *data_size, uint8_t *buf, int buf_size) +{ + VmncContext * const c = (VmncContext *)avctx->priv_data; + uint8_t *outptr; + uint8_t *src = buf; + int t, dx, dy, w, h, enc, chunks, res; + + c->pic.reference = 1; + c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE; + if(avctx->reget_buffer(avctx, &c->pic) < 0){ + av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); + return -1; + } + + t = BE_32(src); + src += 4; + + chunks = t & 0xFF; + if(chunks > 8) { + av_log(avctx, AV_LOG_ERROR, "Frame decoding is not possible. Please report sample to developers.\n"); + return -1; + } + if(chunks == 8) { + int w, h, depth; + c->pic.key_frame = 1; + c->pic.pict_type = FF_I_TYPE; + + /* parse ServerInitialization struct */ + src += 4; + w = BE_16(src); src += 2; + h = BE_16(src); src += 2; + t = BE_32(src); src += 4; + if(t != MAGIC_WMVi) { + av_log(avctx, AV_LOG_INFO, "Invalid header: magic not found\n"); + return -1; + } + 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 pixel format data + src += 13; + chunks = 1; // there should be one chunk with the whole frame, rest could be ignored + } else { + c->pic.key_frame = 0; + c->pic.pict_type = FF_P_TYPE; + } + while(chunks--) { + // decode FramebufferUpdate struct + dx = BE_16(src); src += 2; + dy = BE_16(src); src += 2; + w = BE_16(src); src += 2; + h = BE_16(src); src += 2; + 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; + } + enc = BE_32(src); src += 4; + if(enc != 0x00000005) { + av_log(avctx, AV_LOG_ERROR, "Only hextile decoding is supported for now\n"); + switch(enc) { + case 0: + av_log(avctx, AV_LOG_INFO, "And this is raw encoding\n"); + break; + case 1: + av_log(avctx, AV_LOG_INFO, "And this is CopyRect encoding\n"); + break; + case 2: + av_log(avctx, AV_LOG_INFO, "And this is RRE encoding\n"); + break; + case 3: + av_log(avctx, AV_LOG_INFO, "And this is CoRRE encoding\n"); + break; + default: + av_log(avctx, AV_LOG_INFO, "And this is unknown encoding (%i)\n", enc); + } + return -1; + } + outptr = c->pic.data[0] + dx * c->bpp2 + dy * c->pic.linesize[0]; + res = decode_hextile(c, outptr, src, w, h, c->pic.linesize[0]); + if(res < 0) + return -1; + src += res; + } + *data_size = sizeof(AVFrame); + *(AVFrame*)data = c->pic; + + /* always report that the buffer was completely consumed */ + return buf_size; +} + + + +/* + * + * Init VMnc decoder + * + */ +static int decode_init(AVCodecContext *avctx) +{ + VmncContext * const c = (VmncContext *)avctx->priv_data; + + c->avctx = avctx; + avctx->has_b_frames = 0; + + c->pic.data[0] = NULL; + c->width = avctx->width; + c->height = avctx->height; + + if (avcodec_check_dimensions(avctx, avctx->height, avctx->width) < 0) { + return 1; + } + c->bpp = avctx->bits_per_sample; + c->bpp2 = c->bpp/8; + + switch(c->bpp){ + case 8: + avctx->pix_fmt = PIX_FMT_PAL8; + break; + case 16: + avctx->pix_fmt = PIX_FMT_RGB555; + break; + case 32: + avctx->pix_fmt = PIX_FMT_RGB32; + break; + default: + av_log(avctx, AV_LOG_ERROR, "Unsupported bitdepth %i\n", c->bpp); + } + + return 0; +} + + + +/* + * + * Uninit VMnc decoder + * + */ +static int decode_end(AVCodecContext *avctx) +{ + VmncContext * const c = (VmncContext *)avctx->priv_data; + + if (c->pic.data[0]) + avctx->release_buffer(avctx, &c->pic); + + return 0; +} + +AVCodec vmnc_decoder = { + "VMware video", + CODEC_TYPE_VIDEO, + CODEC_ID_VMNC, + sizeof(VmncContext), + decode_init, + NULL, + decode_end, + decode_frame +}; + |