ffmpeg/libavcodec/vmnc.c

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/*
* 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 "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 = 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 = 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 = 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
};