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/*
tempest for eliza code
Copyright (C) 2001 Erik Thiele
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
*/
#include <math.h>
#include <stdlib.h>
#include <sys/time.h>
#include <unistd.h>
#include <stdio.h>
#include <SDL.h>
#include <string.h>
#include <assert.h>
double fT; // Traegerfrequenz des Radiosenders [1/s]
u_int32_t resx; // anzahl sichtbarer pixel in X richtung
u_int32_t resy; // anzahl sichtbarer pixel in Y richtung
u_int32_t horizontalspan; // anzahl virtueller pixel in X richtung
u_int32_t verticalspan; // anzahl virtueller pixel in Y richtung
double fP; // Pixelfrequenz der Grafikkarte [1/s]
int playbackmode;
double amplify;
SDL_Surface *screen;
void error (const char *const msg)
{
fprintf(stderr, "ERROR: %s\n\n", msg);
exit(1);
}
void usage()
{
printf("\nwrong parameters ! read readme file!\n\n");
exit(1);
}
int main(int argc, char *argv[])
{
char *filename;
atexit(SDL_Quit);
printf(
"\n"
"Tempest for MP3 - by erikyyy !\n"
"------------------------------\n"
"\n"
"Read the README file to understand what's happening\n"
"if you do not read it, you will NOT know what to do\n"
);
if (argc!=10) usage();
fP=atof(argv[1]);
resx=atol(argv[2]);
resy=atol(argv[3]);
horizontalspan=atol(argv[4]);
verticalspan=atol(argv[5]);
fT=atof(argv[6]);
playbackmode=atoi(argv[7]);
amplify=atof(argv[8]);
filename=argv[9];
double npp=horizontalspan * verticalspan; // number of pixels pro screen update periode
double gZ=npp/fP; // gesamtZeit pro screen update periode
double cT=gZ*fT; // anzahl Traegerperioden pro update periode
cT=double(int(cT));
fT=cT/gZ;
printf("\n"
"Pixel Clock %.5f Hz\n"
"X Resolution %d Pixels\n"
"Y Resolution %d Pixels\n"
"Horizontal Total %d Pixels\n"
"Vertical Total %d Pixels\n"
"AM Carrier Frequency %.5f Hz\n"
"Playbackmode %d\n"
"Amplify %.5f\n"
"\n\n",
fP,resx,resy,horizontalspan,verticalspan,fT,playbackmode,amplify);
if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
exit(1);
}
screen = SDL_SetVideoMode(resx, resy, 8, SDL_HWPALETTE | SDL_ANYFORMAT | SDL_FULLSCREEN);
if ( screen == NULL ) {
fprintf(stderr, "Couldn't set video mode: %s\n", SDL_GetError());
exit(1);
}
if ((screen->flags & SDL_HWPALETTE) == 0) error("i can't get hardware palette support.");
if ((screen->flags & SDL_FULLSCREEN) == 0) error("cannot set fullscreen mode.");
if (screen->format->BitsPerPixel != 8) error("cannot set 8bpp mode.");
SDL_LockSurface (screen);
u_int8_t *p = (u_int8_t*) screen->pixels;
u_int32_t pitch=screen->pitch;
double npcb=npp/double(128); // number of pixels pro screen update periode pro audio sample
for (u_int32_t y=0;y<resy;++y)
for (u_int32_t x=0;x<resx;++x) {
double iP=y*horizontalspan+x; // pixel index
double tP=iP/fP; // pixel zeit [s]
if (sin(tP*fT*double(2)*M_PI)>0)
p[pitch*y+x]=int(iP/npcb)*2;
else
p[pitch*y+x]=int(iP/npcb)*2+1;
}
SDL_UnlockSurface(screen);
SDL_Flip(screen);
double aF=fP/npcb; // audio frequenz [1/s]
printf("audio file frequency should be %f Hz\n",aF);
u_int32_t audiolength;
u_int8_t *audiobuf;
{
FILE *input;
input = fopen(filename,"rb");
assert (input != NULL);
assert (fseek(input,0,SEEK_END) != -1);
audiolength=ftell(input);
assert (audiolength>=0);
assert (fseek(input,0,SEEK_SET) != -1);
audiobuf = (u_int8_t*) malloc (audiolength);
assert (audiobuf != 0);
assert (fread(audiobuf,audiolength,1,input)==1);
assert (fclose(input)==0);
}
printf("audiolength is %d\n",audiolength);
SDL_Event event;
SDL_Color colors[256];
u_int32_t curpos=0;
for (;;) {
if(SDL_PollEvent(&event)) if (event.type==SDL_KEYDOWN) exit(0);
for(int i=0;i<128;i++){
double value=audiobuf[curpos];
value-=double(128);
value*=amplify;
value+=double(128);
int ivalue=int(value);
if (ivalue<0) ivalue=0;
if (ivalue>255) ivalue=255;
if (playbackmode==0) {
colors[i*2].r=ivalue;
colors[i*2].g=ivalue;
colors[i*2].b=ivalue;
colors[i*2+1].r=0;
colors[i*2+1].g=0;
colors[i*2+1].b=0;
}else if (playbackmode==1) {
int col = (ivalue * 20) / 45;
colors[i*2].r=col;
colors[i*2].g=col;
colors[i*2].b=col;
colors[i*2+1].r=255-col;
colors[i*2+1].g=255-col;
colors[i*2+1].b=255-col;
}
curpos ++;
if (curpos>=audiolength) exit(0);
}
SDL_SetPalette(screen, SDL_PHYSPAL, colors, 0, 256);
}
return 0;
}
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