mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
523 lines
15 KiB
523 lines
15 KiB
/* |
|
* VMware Screen Codec (VMnc) decoder |
|
* Copyright (c) 2006 Konstantin Shishkov |
|
* |
|
* This file is part of Libav. |
|
* |
|
* Libav 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. |
|
* |
|
* Libav 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 Libav; 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" |
|
|
|
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 *data_size, 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; |
|
|
|
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 = 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--) { |
|
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 = 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); |
|
} |
|
} |
|
*data_size = sizeof(AVFrame); |
|
*(AVFrame*)data = c->pic; |
|
|
|
/* 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; |
|
|
|
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; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
|
|
|
|
/* |
|
* |
|
* Uninit VMnc decoder |
|
* |
|
*/ |
|
static av_cold int decode_end(AVCodecContext *avctx) |
|
{ |
|
VmncContext * const c = 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 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"), |
|
};
|
|
|