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：
代码语言：go复制package main
import (
"fmt"
"github.com/moonfdd/sdl2-go/sdl"
"github.com/moonfdd/sdl2-go/sdlcommon"
"io/ioutil"
"time"
"unsafe"
)
const REFRESH_EVENT = sdl.SDL_USEREVENT 1 // 请求画面刷新事件
const QUIT_EVENT = sdl.SDL_USEREVENT 2 // 退出事件
//定义分辨率
// YUV像素分辨率
const YUV_WIDTH = 320
const YUV_HEIGHT = 240
//定义YUV格式
const YUV_FORMAT = sdl.SDL_PIXELFORMAT_IYUV
var s_thread_exit = 0 // 退出标志 = 1则退出
func main() {
sdlcommon.SetSDL2Path("SDL2.dll")
sdl.SDL_Init(sdl.SDL_INIT_VIDEO)
pixformat := YUV_FORMAT
// 分辨率
// 1. YUV的分辨率
video_width := int32(YUV_WIDTH)
video_height := int32(YUV_HEIGHT)
// 2.显示窗口的分辨率
win_width := int32(YUV_WIDTH)
win_height := int32(YUV_WIDTH)
y_frame_len := video_width * video_height
u_frame_len := video_width * video_height / 4
v_frame_len := video_width * video_height / 4
yuv_frame_len := y_frame_len u_frame_len v_frame_len
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)
if window == nil {
fmt.Printf("Can't create window, err:%s", sdl.SDL_GetError())
return
}
renderer := window.SDL_CreateRenderer(-1, 0)
texture := renderer.SDL_CreateTexture(uint32(pixformat), sdl.SDL_TEXTUREACCESS_STREAMING, video_width, video_height)
var event sdl.SDL_Event
var rect sdl.SDL_Rect
fileData, err := ioutil.ReadFile("yuv420p_320x240.yuv")
if err != nil {
fmt.Println("读取文件失败", err)
return
}
//创建请求刷新线程
go func() {
for s_thread_exit == 0 {
var event sdl.SDL_Event
event.Type = REFRESH_EVENT
event.SDL_PushEvent()
time.Sleep(40 * time.Millisecond)
}
s_thread_exit = 0
var event sdl.SDL_Event
event.Type = QUIT_EVENT
event.SDL_PushEvent()
}()
for {
// 收取SDL系统里面的事件
event.SDL_WaitEvent()
if event.Type == REFRESH_EVENT { // 画面刷新事件
if len(fileData) < int(yuv_frame_len) {
break
}
video_buf := fileData[0:yuv_frame_len]
fileData = fileData[yuv_frame_len:]
// 设置纹理的数据 video_width = 320， plane
texture.SDL_UpdateTexture(nil, uintptr(unsafe.Pointer(&video_buf[0])), video_width)
// 显示区域，可以通过修改w和h进行缩放
rect.X = 0
rect.Y = 0
//w_ratio := win_width * 1.0 / video_width
//h_ratio := win_height * 1.0 / video_height
//// 320x240 怎么保持原视频的宽高比例
//rect.W = video_width * w_ratio
//rect.H = video_height * h_ratio
rect.W = win_width
rect.H = win_height
// 清除当前显示
renderer.SDL_RenderClear()
// 将纹理的数据拷贝给渲染器
renderer.SDL_RenderCopy(texture, nil, &rect)
// 显示
renderer.SDL_RenderPresent()
} else if event.Type == sdl.SDL_WINDOWEVENT {
window.SDL_GetWindowSize(&win_width, &win_height)
} else if event.Type == sdl.SDL_QUIT {
s_thread_exit = 1
} else if event.Type == QUIT_EVENT {
break
}
}
texture.SDL_DestroyTexture()
renderer.SDL_DestroyRenderer()
window.SDL_DestroyWindow()
sdl.SDL_Quit()
}执行结果如下：
在这里插入图片描述
