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Originally committed as revision 6171 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Kostya Shishkov
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Sep 5, 2006
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/* | ||
* 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 | ||
* | ||
*/ | ||
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/** | ||
* @file vmnc.c | ||
* VMware Screen Codec (VMnc) decoder | ||
* As Alex Beregszaszi discovered, this is effectively RFB data dump | ||
*/ | ||
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#include <stdio.h> | ||
#include <stdlib.h> | ||
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#include "common.h" | ||
#include "avcodec.h" | ||
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#define MAGIC_WMVi 0x574D5669 | ||
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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 | ||
}; | ||
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/* | ||
* Decoder context | ||
*/ | ||
typedef struct VmncContext { | ||
AVCodecContext *avctx; | ||
AVFrame pic; | ||
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int bpp; | ||
int bpp2; | ||
int bigendian; | ||
uint8_t pal[768]; | ||
int width, height; | ||
} VmncContext; | ||
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/* 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; | ||
} | ||
} | ||
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/* 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; | ||
} | ||
} | ||
} | ||
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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; | ||
} | ||
} | ||
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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; | ||
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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); | ||
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paint_rect(dst2, 0, 0, bw, bh, bg, bpp, stride); | ||
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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; | ||
} | ||
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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; | ||
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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; | ||
} | ||
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t = BE_32(src); | ||
src += 4; | ||
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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; | ||
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/* 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; | ||
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/* always report that the buffer was completely consumed */ | ||
return buf_size; | ||
} | ||
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/* | ||
* | ||
* Init VMnc decoder | ||
* | ||
*/ | ||
static int decode_init(AVCodecContext *avctx) | ||
{ | ||
VmncContext * const c = (VmncContext *)avctx->priv_data; | ||
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c->avctx = avctx; | ||
avctx->has_b_frames = 0; | ||
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c->pic.data[0] = NULL; | ||
c->width = avctx->width; | ||
c->height = avctx->height; | ||
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if (avcodec_check_dimensions(avctx, avctx->height, avctx->width) < 0) { | ||
return 1; | ||
} | ||
c->bpp = avctx->bits_per_sample; | ||
c->bpp2 = c->bpp/8; | ||
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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); | ||
} | ||
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return 0; | ||
} | ||
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/* | ||
* | ||
* Uninit VMnc decoder | ||
* | ||
*/ | ||
static int decode_end(AVCodecContext *avctx) | ||
{ | ||
VmncContext * const c = (VmncContext *)avctx->priv_data; | ||
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if (c->pic.data[0]) | ||
avctx->release_buffer(avctx, &c->pic); | ||
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return 0; | ||
} | ||
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AVCodec vmnc_decoder = { | ||
"VMware video", | ||
CODEC_TYPE_VIDEO, | ||
CODEC_ID_VMNC, | ||
sizeof(VmncContext), | ||
decode_init, | ||
NULL, | ||
decode_end, | ||
decode_frame | ||
}; | ||
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