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sdl-win.c
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sdl-win.c
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/*
* MIT License
*
* Copyright (c) 2020 vzvca
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <SDL2/SDL.h>
#define WIDTH 720
#define HEIGHT 576
#define FPS 10
#define WINX 100
#define WINY 100
int g_x = WINX;
int g_y = WINY;
int g_width = WIDTH;
int g_height = HEIGHT;
int g_fps = FPS;
char *g_input = NULL;
int SDLCALL
ThreadFunc(void *data)
{
// variable declarations
SDL_Window *win = NULL;
SDL_Renderer *renderer = NULL;
SDL_Texture *img = NULL;
char *pixels = NULL;
int fbfd;
// create the window and renderer
// note that the renderer is accelerated
puts("create window");
win = SDL_CreateWindow("video capture", g_x, g_y, g_width, g_height, 0);
puts("create renderer");
renderer = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED);
puts("create texture");
img = SDL_CreateTexture(renderer,
SDL_PIXELFORMAT_BGRA32, SDL_TEXTUREACCESS_STREAMING,
g_width, g_height);
// Display window
SDL_ShowWindow(win);
puts("mmap video source");
fbfd = open( g_input, O_RDWR );
if (fbfd == -1) {
perror("Error: cannot open output file");
exit(1);
}
puts("The output file was opened successfully.");
pixels = (char *)mmap(0, g_width*g_height*4, PROT_READ, MAP_SHARED, fbfd, 0);
if (*(int*)pixels == -1) {
perror("Error: failed to map output file to memory");
exit(1);
}
puts("The output file was mapped to memory successfully.\n");
// main loop
puts("entering main loop");
while (1) {
// event handling
SDL_Event e;
if ( SDL_WaitEventTimeout(&e,1000/g_fps) ) {
if (e.type == SDL_QUIT)
break;
else if (e.type == SDL_KEYUP && e.key.keysym.sym == SDLK_ESCAPE)
break;
}
// clear the screen
SDL_RenderClear(renderer);
// update video frame
SDL_UpdateTexture( img, NULL, pixels, g_width*4 );
// copy the texture to the rendering context
SDL_RenderCopy(renderer, img, NULL, NULL);
// flip the backbuffer
// this means that everything that we prepared behind the screens is actually shown
SDL_RenderPresent(renderer);
}
SDL_DestroyTexture(img);
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(win);
munmap( pixels, g_width*g_height*4 );
close(fbfd);
return 0;
}
/*
* --------------------------------------------------------------------------
* Usage
* --------------------------------------------------------------------------
*/
void usage( int argc, char *argv[], int optind )
{
char *what = (optind > 0) ? "error" : "usage";
fprintf( stderr, "%s %s :\n%s [-?] -i file [-f fps] [-x x] [-y y] [-w width] [-h height]\n",
argv[0], what, argv[0]);
fprintf( stderr, "\t-?\t\tPrints this message.\n");
fprintf( stderr, "\t-i\t\tSets input video frame file.\n");
fprintf( stderr, "\t-f\t\tSets the video framerate (default %d).\n", FPS);
fprintf( stderr, "\t-w\t\tSets the width of the image (default %d).\n", WIDTH);
fprintf( stderr, "\t-h\t\tSets the height of the image (default %d).\n", HEIGHT);
fprintf( stderr, "\t-x\t\tSets the x position of the window (default %d).\n", WINX);
fprintf( stderr, "\t-y\t\tSets the y position of the window (default %d).\n", WINY);
/* exit with error only if option parsng failed */
exit(optind > 0);
}
/* --------------------------------------------------------------------------
* Main program
* --------------------------------------------------------------------------*/
int main (int argc, char *argv[])
{
SDL_Thread *thread;
int opt;
while ( (opt = getopt( argc, argv, "?i:f:w:h:x:y:")) != -1 ) {
switch( opt ) {
case '?': usage( argc, argv, 0); break;
case 'i': g_input = optarg; break;
case 'w': g_width = atoi(optarg); break;
case 'h': g_height = atoi(optarg); break;
case 'f': g_fps = atoi(optarg); break;
case 'x': g_x = atoi(optarg); break;
case 'y': g_y = atoi(optarg); break;
default:
usage(argc, argv, optind);
}
}
// Initialize SDL.
puts("init sdl");
if (SDL_Init(0) < 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Init failed: %s\n", SDL_GetError());
return 1;
}
if (SDL_InitSubSystem(SDL_INIT_VIDEO) < 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Init failed: %s\n", SDL_GetError());
return 1;
}
thread = SDL_CreateThread(ThreadFunc, "One", "#1");
if (thread == NULL) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create thread: %s\n", SDL_GetError());
exit(1);
}
SDL_Log("Waiting for thread #1\n");
SDL_WaitThread(thread, NULL);
}