diff options
Diffstat (limited to 'contrib/ffmpeg/libavcodec/vmnc.c')
| -rw-r--r-- | contrib/ffmpeg/libavcodec/vmnc.c | 524 |
1 files changed, 524 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavcodec/vmnc.c b/contrib/ffmpeg/libavcodec/vmnc.c new file mode 100644 index 000000000..b430a7e66 --- /dev/null +++ b/contrib/ffmpeg/libavcodec/vmnc.c @@ -0,0 +1,524 @@ +/* + * 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 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" + +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(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, 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 colour */ +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, 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, 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; + 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 *data_size, uint8_t *buf, int buf_size) +{ + VmncContext * const c = (VmncContext *)avctx->priv_data; + uint8_t *outptr; + uint8_t *src = buf; + int dx, dy, w, h, depth, enc, chunks, res, size_left; + + 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; + } + + c->pic.key_frame = 0; + c->pic.pict_type = FF_P_TYPE; + + //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--) { + 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(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 = FF_I_TYPE; + 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); + } + } + *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; + + c->pic.data[0] = NULL; + c->width = avctx->width; + c->height = avctx->height; + + if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 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); + + av_free(c->curbits); + av_free(c->curmask); + av_free(c->screendta); + return 0; +} + +AVCodec vmnc_decoder = { + "VMware video", + CODEC_TYPE_VIDEO, + CODEC_ID_VMNC, + sizeof(VmncContext), + decode_init, + NULL, + decode_end, + decode_frame +}; + |