golang调用sdl2,播放yuv视频

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：

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：

golang调用sdl2,播放yuv视频的相关教程结束。