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Webcam/Webcam-SDL2-master/Lazarus/C-Header/videodev2.h
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,164 @@ | ||
| #include "v4l2_driver.h" | ||
| #include <SDL2/SDL.h> | ||
| #include <linux/videodev2.h> | ||
| #include <pthread.h> | ||
| #include <stdio.h> | ||
| #include <stdlib.h> | ||
| #include <string.h> | ||
| #include <sys/ioctl.h> | ||
| #include <time.h> | ||
| #include <unistd.h> | ||
|
|
||
| #define SAVE_EVERY_FRAME 0 | ||
|
|
||
| pthread_t thread_stream; | ||
| SDL_Window *sdlScreen; | ||
| SDL_Renderer *sdlRenderer; | ||
| SDL_Texture *sdlTexture; | ||
| SDL_Rect sdlRect; | ||
|
|
||
|
|
||
| struct streamHandler { | ||
| int fd; | ||
| void (*framehandler)(void *pframe, int length); | ||
| }; | ||
|
|
||
| static void frame_handler(void *pframe, int length) { | ||
| SDL_UpdateTexture(sdlTexture, &sdlRect, pframe, IMAGE_WIDTH * 2); | ||
| // SDL_UpdateYUVTexture | ||
| SDL_RenderClear(sdlRenderer); | ||
| SDL_RenderCopy(sdlRenderer, sdlTexture, NULL, &sdlRect); | ||
| SDL_RenderPresent(sdlRenderer); | ||
|
|
||
| } | ||
|
|
||
| static void *v4l2_streaming(void *arg) { | ||
| // SDL2 begins | ||
| memset(&sdlRect, 0, sizeof(sdlRect)); | ||
| if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER)) { | ||
| printf("Could not initialize SDL - %s\n", SDL_GetError()); | ||
| return NULL; | ||
| } | ||
|
|
||
| sdlScreen = SDL_CreateWindow("Simple YUV Window", SDL_WINDOWPOS_UNDEFINED, | ||
| SDL_WINDOWPOS_UNDEFINED, IMAGE_WIDTH, | ||
| IMAGE_HEIGHT, SDL_WINDOW_SHOWN); | ||
|
|
||
| if (!sdlScreen) { | ||
| fprintf(stderr, "SDL: could not create window - exiting:%s\n", | ||
| SDL_GetError()); | ||
| return NULL; | ||
| } | ||
|
|
||
| sdlRenderer = SDL_CreateRenderer( | ||
| sdlScreen, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC); | ||
| if (sdlRenderer == NULL) { | ||
| fprintf(stderr, "SDL_CreateRenderer Error\n"); | ||
| return NULL; | ||
| } | ||
| sdlTexture = | ||
| SDL_CreateTexture(sdlRenderer, SDL_PIXELFORMAT_YUY2, | ||
| SDL_TEXTUREACCESS_STREAMING, IMAGE_WIDTH, IMAGE_HEIGHT); | ||
| sdlRect.w = IMAGE_WIDTH; | ||
| sdlRect.h = IMAGE_HEIGHT; | ||
|
|
||
| int fd = ((struct streamHandler *)(arg))->fd; | ||
|
|
||
| void (*handlerXXX)(void *pframe, int length) = ((struct streamHandler *)(arg))->framehandler; | ||
|
|
||
| fd_set fds; | ||
| struct v4l2_buffer buf; | ||
|
|
||
| while (1) { | ||
| int ret; | ||
| FD_ZERO(&fds); | ||
| FD_SET(fd, &fds); | ||
| struct timeval tv = {.tv_sec = 1, .tv_usec = 0}; | ||
| ret = select(fd + 1, &fds, NULL, NULL, &tv); | ||
|
|
||
| if (FD_ISSET(fd, &fds)) { | ||
| memset(&buf, 0, sizeof(buf)); | ||
| buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; | ||
| buf.memory = V4L2_MEMORY_MMAP; | ||
| ioctl(fd, VIDIOC_DQBUF, &buf); | ||
|
|
||
| (*handlerXXX)(v4l2_ubuffers[buf.index].start, v4l2_ubuffers[buf.index].length); | ||
|
|
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| buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; | ||
| buf.memory = V4L2_MEMORY_MMAP; | ||
| ioctl(fd, VIDIOC_QBUF, &buf); | ||
| } | ||
| } | ||
| return NULL; | ||
| } | ||
|
|
||
| int main(int argc, char const *argv[]) { | ||
| const char *device = "/dev/video0"; | ||
|
|
||
| int video_fildes = v4l2_open(device); | ||
| if (video_fildes == -1) { | ||
| fprintf(stderr, "can't open %s\n", device); | ||
| exit(-1); | ||
| } | ||
|
|
||
| if (v4l2_querycap(video_fildes, device) == -1) { | ||
| perror("v4l2_querycap"); | ||
| goto exit_; | ||
| } | ||
|
|
||
| printf("----- %d\n", V4L2_PIX_FMT_YUYV); | ||
|
|
||
| // most of devices support YUYV422 packed. | ||
| if (v4l2_sfmt(video_fildes, V4L2_PIX_FMT_YUYV) == -1) { | ||
| perror("v4l2_sfmt"); | ||
| goto exit_; | ||
| } | ||
|
|
||
| if (v4l2_gfmt(video_fildes) == -1) { | ||
| perror("v4l2_gfmt"); | ||
| goto exit_; | ||
| } | ||
|
|
||
| if (v4l2_sfps(video_fildes, 30) == -1) { // no fatal error | ||
| perror("v4l2_sfps"); | ||
| } | ||
|
|
||
| if (v4l2_mmap(video_fildes) == -1) { | ||
| perror("v4l2_mmap"); | ||
| goto exit_; | ||
| } | ||
|
|
||
| if (v4l2_streamon(video_fildes) == -1) { | ||
| perror("v4l2_streamon"); | ||
| goto exit_; | ||
| } | ||
|
|
||
| // create a thread that will update frame int the buffer | ||
| struct streamHandler sH = {video_fildes, frame_handler}; | ||
|
|
||
| v4l2_streaming( (void *)(&sH)); | ||
|
|
||
| int quit = 0; | ||
| SDL_Event e; | ||
| while (!quit) { | ||
| usleep(250); | ||
| } | ||
|
|
||
|
|
||
| if (v4l2_streamoff(video_fildes) == -1) { | ||
| perror("v4l2_streamoff"); | ||
| goto exit_; | ||
| } | ||
|
|
||
| if (v4l2_munmap() == -1) { | ||
| perror("v4l2_munmap"); | ||
| goto exit_; | ||
| } | ||
|
|
||
| exit_: | ||
| if (v4l2_close(video_fildes) == -1) { | ||
| perror("v4l2_close"); | ||
| }; | ||
| SDL_Quit(); | ||
| return 0; | ||
| } |
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