golang调用sdl2,播放yuv视频

    win10 x64下测试成功，其他操作系统下不保证成功。

    采用的是syscall方式，不是cgo方式。

    见地址

    代码如下：

    1. package main
    3. import (
    4.     "fmt"
    5.     "github.com/moonfdd/sdl2-go/sdl"
    6.     "github.com/moonfdd/sdl2-go/sdlcommon"
    7.     "io/ioutil"
    8.     "time"
    9.     "unsafe"
    10. )
    12. const REFRESH_EVENT = sdl.SDL_USEREVENT + 1 // 请求画面刷新事件
    13. const QUIT_EVENT = sdl.SDL_USEREVENT + 2    // 退出事件
    14. //定义分辨率
    15. // YUV像素分辨率
    16. const YUV_WIDTH = 320
    17. const YUV_HEIGHT = 240
    19. //定义YUV格式
    20. const YUV_FORMAT = sdl.SDL_PIXELFORMAT_IYUV
    22. var s_thread_exit = 0 // 退出标志 = 1则退出
    24. func main() {
    25.     sdlcommon.SetSDL2Path("SDL2.dll")
    26.     sdl.SDL_Init(sdl.SDL_INIT_VIDEO)
    27.     pixformat := YUV_FORMAT
    28.     // 分辨率
    29.     // 1. YUV的分辨率
    30.     video_width := int32(YUV_WIDTH)
    31.     video_height := int32(YUV_HEIGHT)
    32.     // 2.显示窗口的分辨率
    33.     win_width := int32(YUV_WIDTH)
    34.     win_height := int32(YUV_WIDTH)
    36.     y_frame_len := video_width * video_height
    37.     u_frame_len := video_width * video_height / 4
    38.     v_frame_len := video_width * video_height / 4
    39.     yuv_frame_len := y_frame_len + u_frame_len + v_frame_len
    41.     window := sdl.SDL_CreateWindow("微信公众号：福大大架构师每日一题", sdl.SDL_WINDOWPOS_UNDEFINED, sdl.SDL_WINDOWPOS_UNDEFINED, video_width, video_height, sdl.SDL_WINDOW_OPENGL|sdl.SDL_WINDOW_RESIZABLE)
    42.     if window == nil {
    43.         fmt.Printf("Can't create window, err:%s", sdl.SDL_GetError())
    44.         return
    45.     }
    46.     renderer := window.SDL_CreateRenderer(-1, 0)
    47.     texture := renderer.SDL_CreateTexture(uint32(pixformat), sdl.SDL_TEXTUREACCESS_STREAMING, video_width, video_height)
    48.     var event sdl.SDL_Event
    49.     var rect sdl.SDL_Rect
    50.     fileData, err := ioutil.ReadFile("yuv420p_320x240.yuv")
    51.     if err != nil {
    52.         fmt.Println("读取文件失败", err)
    53.         return
    54.     }
    55.     //创建请求刷新线程
    56.     go func() {
    57.         for s_thread_exit == 0 {
    58.             var event sdl.SDL_Event
    59.             event.Type = REFRESH_EVENT
    60.             event.SDL_PushEvent()
    61.             time.Sleep(40 * time.Millisecond)
    62.         }
    63.         s_thread_exit = 0
    64.         var event sdl.SDL_Event
    65.         event.Type = QUIT_EVENT
    66.         event.SDL_PushEvent()
    67.     }()
    69.     for {
    70.         // 收取SDL系统里面的事件
    71.         event.SDL_WaitEvent()
    72.         if event.Type == REFRESH_EVENT { // 画面刷新事件
    73.             if len(fileData) < int(yuv_frame_len) {
    74.                 break
    75.             }
    76.             video_buf := fileData[0:yuv_frame_len]
    77.             fileData = fileData[yuv_frame_len:]
    78.             // 设置纹理的数据 video_width = 320， plane
    79.             texture.SDL_UpdateTexture(nil, uintptr(unsafe.Pointer(&video_buf[0])), video_width)
    80.             // 显示区域，可以通过修改w和h进行缩放
    81.             rect.X = 0
    82.             rect.Y = 0
    83.             //w_ratio := win_width * 1.0 / video_width
    84.             //h_ratio := win_height * 1.0 / video_height
    85.             //// 320x240 怎么保持原视频的宽高比例
    86.             //rect.W = video_width * w_ratio
    87.             //rect.H = video_height * h_ratio
    88.             rect.W = win_width
    89.             rect.H = win_height
    91.             // 清除当前显示
    92.             renderer.SDL_RenderClear()
    93.             // 将纹理的数据拷贝给渲染器
    94.             renderer.SDL_RenderCopy(texture, nil, &rect)
    95.             // 显示
    96.             renderer.SDL_RenderPresent()
    98.         } else if event.Type == sdl.SDL_WINDOWEVENT {
    99.             window.SDL_GetWindowSize(&win_width, &win_height)
    100.         } else if event.Type == sdl.SDL_QUIT {
    101.             s_thread_exit = 1
    102.         } else if event.Type == QUIT_EVENT {
    103.             break
    104.         }
    105.     }
    106.     texture.SDL_DestroyTexture()
    107.     renderer.SDL_DestroyRenderer()
    108.     window.SDL_DestroyWindow()
    109.     sdl.SDL_Quit()
    110. }

    执行结果如下：

    golang调用sdl2,播放yuv视频 - 图1