mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-20 06:20:40 +00:00
332 lines
9.0 KiB
C
332 lines
9.0 KiB
C
/*
|
|
* 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"
|
|
|
|
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;
|
|
} 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;
|
|
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 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);
|
|
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);
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
src += 2;
|
|
chunks = BE_16(src); src += 2;
|
|
while(chunks--) {
|
|
dx = BE_16(src); src += 2;
|
|
dy = BE_16(src); src += 2;
|
|
w = BE_16(src); src += 2;
|
|
h = BE_16(src); src += 2;
|
|
enc = BE_32(src); src += 4;
|
|
switch(enc) {
|
|
case MAGIC_WMVd: // unknown
|
|
src += 2;
|
|
src += w * h * 8; // skip this data for now
|
|
break;
|
|
case MAGIC_WMVe: // unknown
|
|
src += 2;
|
|
break;
|
|
case MAGIC_WMVf: // unknown and empty
|
|
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 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;
|
|
}
|
|
outptr = c->pic.data[0] + dx * c->bpp2 + dy * c->pic.linesize[0];
|
|
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;
|
|
}
|
|
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;
|
|
break;
|
|
default:
|
|
av_log(avctx, AV_LOG_ERROR, "Unsupported block type 0x%08X\n", enc);
|
|
chunks = 0; // leave chunks decoding loop
|
|
}
|
|
}
|
|
*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
|
|
};
|
|
|