142 lines
3.8 KiB
C
142 lines
3.8 KiB
C
#include <stdio.h>
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#include <SDL2/SDL.h>
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#define REFRESH_EVENT (SDL_USEREVENT + 1)
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#define QUIT_EVENT (SDL_USEREVENT + 1)
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#define YUV_WIDTH 320
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#define YUV_HEIGHT 240
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// SDL_PIXELFORMAT_IYUV = /**< Planar mode: Y + U + V (3 planes) */
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#define YUV_FORMAT SDL_PIXELFORMAT_IYUV
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int nThreadExitFlag = 0;
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int refreshVideoThread(void *data) {
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while (!nThreadExitFlag)
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{
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SDL_Event event;
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event.type = REFRESH_EVENT;
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SDL_PushEvent(&event);
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SDL_Delay(40);
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}
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nThreadExitFlag = 0;
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SDL_Event eq;
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eq.type = QUIT_EVENT;
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SDL_PushEvent(&eq);
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return 0;
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}
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int main()
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{
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if (SDL_Init(SDL_INIT_VIDEO)) {
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fprintf(stderr, "SDL_Init(SDL_INIT_VIDEO) failed: %s\n", SDL_GetError());
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return -1;
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}
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SDL_Event event;
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SDL_Rect rect;
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SDL_Window *window;
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SDL_Renderer *renderer = NULL;
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SDL_Texture *texture = NULL;
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SDL_Thread *t = NULL;
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uint32_t pixformat = YUV_FORMAT;
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int video_width = YUV_WIDTH;
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int video_height = YUV_HEIGHT;
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int win_width = YUV_WIDTH;
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int win_height = YUV_HEIGHT;
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FILE *video_fd = NULL;
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const char* yuv_path = "yuv420p_320x240.yuv";
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size_t video_buff_len = 0;
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uint8_t *video_buf = NULL;
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uint32_t y_frame_len = video_width * video_height;
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uint32_t u_frame_len = video_width * video_height / 4;
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uint32_t v_frame_len = video_width * video_height / 4;
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uint32_t yuv_frame_size = y_frame_len + u_frame_len + v_frame_len;
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window = SDL_CreateWindow("YUV", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
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win_width, win_height, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
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if (!window) {
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printf("SDL_CreateWindow() failed: %s\n", SDL_GetError());
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goto fail;
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}
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// 基于窗口创建渲染器
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renderer = SDL_CreateRenderer(window, -1, 0);
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// 基于渲染器创建纹理
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texture = SDL_CreateTexture(renderer, pixformat, SDL_TEXTUREACCESS_STREAMING,
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video_width, video_height);
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video_buf = (uint8_t*)malloc(yuv_frame_size);
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if (!video_buf) {
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fprintf(stderr, "malloc video_buf failed\n");
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}
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video_fd = fopen(yuv_path, "rb");
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if (!video_fd) {
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fprintf(stderr, "fopen failed\n");
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}
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t = SDL_CreateThread(refreshVideoThread, "refresh_video_thread", NULL);
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while (1) {
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SDL_WaitEvent(&event);
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if (event.type == REFRESH_EVENT) {
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video_buff_len = fread(video_buf, 1, yuv_frame_size, video_fd);
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if (video_buff_len <= 0) {
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fprintf(stderr, "fread from yuv file failed\n");
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goto fail;
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}
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SDL_UpdateTexture(texture, NULL, video_buf, video_width);
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rect.x = 0;
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rect.y = 0;
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float w_ratio = win_width * 1.0 / video_width;
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float h_ratio = win_height * 1.0 / video_height;
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// 保持宽高比
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rect.w = video_width * w_ratio;
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rect.h = video_height * h_ratio;
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// 清楚渲染器中的缓存
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SDL_RenderClear(renderer);
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SDL_RenderCopy(renderer, texture, NULL, &rect);
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SDL_RenderPresent(renderer);
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}
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else if (event.type == SDL_WINDOWEVENT) {
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SDL_GetWindowSize(window, &win_width, &win_height);
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}
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else if (event.type == SDL_QUIT) {
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nThreadExitFlag = 1;
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}
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else if (event.type == QUIT_EVENT) {
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break;
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}
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}
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fail:
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nThreadExitFlag = 1;
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if (t) {
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SDL_WaitThread(t, NULL);
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}
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if (video_buf) {
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free(video_buf);
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}
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if (video_fd) {
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fclose(video_fd);
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}
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if (texture) {
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SDL_DestroyTexture(texture);
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}
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if (renderer) {
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SDL_DestroyRenderer(renderer);
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}
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if (window) {
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SDL_DestroyWindow(window);
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}
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SDL_Quit();
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return 0;
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}
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