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/*********************************************************************************
* recordMyDesktop *
**********************************************************************************
* *
* Copyright (C) 2006 John Varouhakis *
* *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program 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 General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the Free Software *
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA *
* *
* *
* *
* For further information contact me at johnvarouhakis@gmail.com *
**********************************************************************************/
#include <recordmydesktop.h>
void MakeChecksums(unsigned char *buf,int width,int height,int divisor,unsigned short int *checksums){
int i,k,j,m;
for(i=0;i<divisor;i++){
for(k=0;k<divisor;k++){
int A=1,B=0;
for(j=0;j<height/divisor;j++){
for(m=0;m<width/divisor;m++){
A+=buf[i*(width*height/divisor)+j*width+k*width/divisor+m];
B+=A;
}
}
A=A%65521;
B=B%65521;
checksums[i*divisor+k]=B*65536+A;
}
}
}
void FlushBlock(unsigned char *buf,int blockno,int width, int height,int divisor,gzFile *fp){
int j,
block_i=blockno/divisor,//place on the grid
block_k=blockno%divisor;
for(j=0;j<height/divisor;j++)//we flush in rows
gzwrite(fp,(void *)&buf[block_i*(width*height/divisor)+j*width+block_k*width/divisor],width/divisor);
}
void *CacheImageBuffer(void *pdata){
pthread_mutex_t pmut,imut;
pthread_mutex_init(&pmut,NULL);
pthread_mutex_init(&imut,NULL);
yuv_buffer yuv[2];
gzFile *fp=((ProgData *)pdata)->cache_data->ifp;
if(fp==NULL)exit(13);
unsigned short int checksums_y[2][256],
checksums_u[2][64],
checksums_v[2][64];
int i,current=0,divisor=16,firstrun=1,frameno=0;
//we want to make sure that each block has a sufficient
//number of bytes, so that the checksum will wrap
//around 65521.
while(((((ProgData *)pdata)->brwin.rgeom.width*
((ProgData *)pdata)->brwin.rgeom.width )
/pow(divisor,2))
<=1024){
divisor/=2;
if(divisor==2)
break;
}
for(i=0;i<2;i++){
yuv[i].y_width=((ProgData *)pdata)->enc_data->yuv.y_width;
yuv[i].y_height=((ProgData *)pdata)->enc_data->yuv.y_height;
yuv[i].uv_width=((ProgData *)pdata)->enc_data->yuv.uv_width;
yuv[i].uv_height=((ProgData *)pdata)->enc_data->yuv.uv_height;
yuv[i].y=(unsigned char *)malloc(yuv[i].y_width*yuv[i].y_height);
yuv[i].u=(unsigned char *)malloc(yuv[i].uv_width*yuv[i].uv_height);
yuv[i].v=(unsigned char *)malloc(yuv[i].uv_width*yuv[i].uv_height);
}
while(((ProgData *)pdata)->running){
pthread_cond_wait(&((ProgData *)pdata)->image_buffer_ready,&imut);
if(Paused)
pthread_cond_wait(&((ProgData *)pdata)->pause_cond,&pmut);
pthread_mutex_lock(&((ProgData *)pdata)->yuv_mutex);
//rotate buffers
current=(current)?0:1;
//copy incoming
memcpy(yuv[current].y,((ProgData *)pdata)->enc_data->yuv.y,yuv[current].y_width*yuv[current].y_height);
memcpy(yuv[current].u,((ProgData *)pdata)->enc_data->yuv.u,yuv[current].uv_width*yuv[current].uv_height);
memcpy(yuv[current].v,((ProgData *)pdata)->enc_data->yuv.v,yuv[current].uv_width*yuv[current].uv_height);
//release main buffer
pthread_mutex_unlock(&((ProgData *)pdata)->yuv_mutex);
//get checksums for new
MakeChecksums(yuv[current].y,yuv[current].y_width,yuv[current].y_height,divisor,checksums_y[current]);
MakeChecksums(yuv[current].u,yuv[current].uv_width,yuv[current].uv_height,divisor/2,checksums_u[current]);
MakeChecksums(yuv[current].v,yuv[current].uv_width,yuv[current].uv_height,divisor/2,checksums_v[current]);
//find and flush different blocks
if(firstrun){
firstrun=0;
continue;
}
else{
int prev=(current)?0:1;
int j;
unsigned short ynum,unum,vnum;
unsigned char yblocks[256],ublocks[64],vblocks[64];
FrameHeader fheader;
ynum=unum=vnum=0;
for(j=0;j<pow(divisor,2);j++){
if(checksums_y[current][j]!=checksums_y[prev][j]){
ynum++;
yblocks[ynum-1]=j;
}
}
for(j=0;j<pow(divisor/2,2);j++){
if(checksums_u[current][j]!=checksums_u[prev][j]){
unum++;
ublocks[unum-1]=j;
}
}
for(j=0;j<pow(divisor/2,2);j++){
if(checksums_v[current][j]!=checksums_v[prev][j]){
vnum++;
vblocks[vnum-1]=j;
}
}
/**WRITE FRAME TO DISK*/
if(ynum+unum+vnum>(pow(divisor,2)+pow(divisor/2,2)*2)/10)
gzsetparams (fp,1,Z_FILTERED);
else
gzsetparams (fp,0,Z_FILTERED);
fheader.frameno=++frameno;
fheader.current_total=frames_total;
fheader.Ynum=ynum;
fheader.Unum=unum;
fheader.Vnum=vnum;
fheader.pad=0;
gzwrite(fp,(void*)&fheader,16);
//flush indexes
if(ynum)gzwrite(fp,yblocks,ynum);
if(unum)gzwrite(fp,ublocks,unum);
if(vnum)gzwrite(fp,vblocks,vnum);
//flush the blocks for each buffer
if(ynum)
for(j=0;j<ynum;j++)
FlushBlock(yuv[current].y,yblocks[j],yuv[current].y_width,yuv[current].y_height,divisor,fp);
if(unum)
for(j=0;j<unum;j++)
FlushBlock(yuv[current].u,ublocks[j],yuv[current].uv_width,yuv[current].uv_height,divisor/2,fp);
if(vnum)
for(j=0;j<vnum;j++)
FlushBlock(yuv[current].v,vblocks[j],yuv[current].uv_width,yuv[current].uv_height,divisor/2,fp);
/**@________________@**/
((ProgData *)pdata)->avd+=((ProgData *)pdata)->frametime*2*((ProgData *)pdata)->args.channels;
}
}
//clean up since we're not finished
for(i=0;i<2;i++){
free(yuv[i].y);
free(yuv[i].u);
free(yuv[i].v);
}
// fprintf(stderr,"Saved %d frames in a total of %d requests",frameno,frames_total);
gzclose(fp);
pthread_exit(&errno);
}
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