基于ffmpeg与SDL的视频播放库

        由于工作需要，自己封装的基于ffmpeg的视频编解码库，显示采用了SDL库。可以播放本地文件或网络流，支持多端口播放，支持文字叠加，截图、视频录制等等。

头文件代码：

#pragma once
#ifdef __DLLEXPORT
#define __DLL_EXP _declspec(dllexport)    
#else
#define __DLL_EXP _declspec(dllimport)    
#endif #include <stdio.h>
#include <string>using namespace std;
//录像状态
enum RecordStatus
{Idle,Recording,Stop
};//视频存储格式
enum VideoFormat
{MP4,AVI,
};//图片存储格式
enum PictureFormat
{JPEG,PNG,BMP,
};//播放器状态
enum PlayStatus
{Close,Playing,Pause
};//滤镜种类
enum FilterType
{Time,Reticle,Text,Other
};//颜色
struct RGBAColor
{BYTE R;BYTE G;BYTE B;BYTE A;
};//OSD字体属性结构体struct OSDParameter
{char* text;int fontSize;        //汉字字号int fontFamily;      //0=黑体，1=楷体，2=宋体 3:ArialRGBAColor fontColor;      //字体颜色 rgb表示RGBAColor backColor;      //字体背景色 rgb表示float x;             //字体坐标 x：宽度百分比0-1float y;             //字体坐标 y：高度百分比0-1bool visible;        //是否可见
};//格式enum  FrameFormat{AUDIO16,RGB32,YV12,UVVY,YUVJ420P};struct FrameInfo
{int width;  					   	//画面宽，单位像素。如果是音频数据则为0；int height; 					  	//画面高。如果是音频数据则为0；int stamp;  					  	//时标信息，单位毫秒。FrameFormat format;                 //数据类型，0：AUDIO16，1：RGB32，2：（YUV420P）YV12，3：YUVJ420P int frameRate; 					    //实时帧率。
};/**
* 功能描述：打开视频
* @param nPort：播放通道号[0,31] 
* @param url：视频文件或视频流地址
* @param data：图像控件句柄，后台录制时，赋值NULL
*
* @return 成功/失败
*/
extern "C" __declspec(dllexport) bool _stdcall VideoPlayer_OpenVideo(int nPort, const char* url, const void* hWnd);/**
*  功能描述： 开始播放
* @param nPort：播放通道号[0,31]
* @param isRealTimePlay：实时播放，在需要实时播放时开启，如播放摄像头流。为false时，将按照帧率播放。
*/
extern "C" __declspec(dllexport) bool _stdcall VideoPlayer_StartPlay(int nPort,bool isRealTimePlay);/**
*  功能描述： 暂停播放
* @param nPort：播放通道号[0,31] 
*/
extern "C" __declspec(dllexport) bool _stdcall VideoPlayer_PausePlay(int nPort);/**
* 功能描述：关闭视频释放资源
* @param nPort：播放通道号[0,31] 
*/
extern "C" __declspec(dllexport)  bool _stdcall VideoPlayer_CloseVideo(int nPort);/**
* 功能描述：设置文件播放指针的相对位置（百分比）
* @param nPort：播放通道号[0,31] 
* @param pos：播放时间位置  0-100
* @param fReleatePos：0-100
*/
extern "C" __declspec(dllexport) bool _stdcall VideoPlayer_SetPlayPos(int nPort, float fReleatePos);/**
* 功能描述：播放速度控制
* @param nPort：播放通道号[0,31] 
* @param speed：速度  0：正常播放   1：1.25倍速  2：1.5倍速 3：1.75倍速 4:2倍速  5：0.75倍速  6：0.5倍速 7：0.25倍速
*/
extern "C" __declspec(dllexport) void _stdcall VideoPlayer_ChangeSpeed(int nPort, int speed);/**
* 功能描述：获取当前播放时间
* @param nPort：播放通道号[0,31] 
* @return 播放时间  单位：秒
*/
extern "C" __declspec(dllexport) bool _stdcall VideoPlayer_GetPlayedTime(int nPort);/**
* 功能描述：播放窗口缩放
* @param nPort：播放通道号[0,31] 
* @return 成功/失败
*/
extern "C" __declspec(dllexport)  bool _stdcall VideoPlayer_ResizeWindow(int nPort);/**
* 功能描述：设置录制参数
* @param nPort：播放通道号[0,31]
* @param fps：视频帧率
* @param quality：图像质量（0-10） 越高质量越好，占用内存越大，设置为0时，为自动码率
* @param duration：单个文件时长(min),默认60分钟
* @param frameExtractionMode:抽帧模式 0：不抽帧，以fps进行编码；1：1/2 帧率，以fps/2进行抽帧(保证fps/2为整数，否则会出现丢帧情况)
* @param format:存储格式,默认为mp4
*
* @return 成功/失败
*/
extern "C" __declspec(dllexport) bool _stdcall VideoPlayer_SetRecordParameter(int nPort,int fps, float quality = 5, int duration = 60, int frameExtractionMode = 0, VideoFormat format= VideoFormat::MP4);/**
* 功能描述：开始录制
* @param nPort：播放通道号[0,31]
* @param path：录像保存路径包含文件名
*
* @return 成功/失败
*/
extern "C" __declspec(dllexport) bool _stdcall VideoPlayer_StartRecord(int nPort, const char* path);/**
* 功能描述：结束录制
* @param nPort：播放通道号[0,31] 
*/
extern "C" __declspec(dllexport) bool _stdcall VideoPlayer_StopRecord(int nPort);/**
* 功能描述：视频截图
* @param nPort：播放通道号[0,31]
* @param path： 图像保存的路径，不含后缀名
* @param format：图像格式，默认为jpeg
*
* @return 成功/失败
*/
extern "C" __declspec(dllexport) bool _stdcall VideoPlayer_ShotImage(int nPort, const char* path, PictureFormat format= PictureFormat::JPEG);/**
* 功能描述：设置某一行的OSD叠加文本
* @param nPort：播放通道号[0,31] 
* @param osdID：OSD文本序号
* @param para：osd属性
*
* @return 成功/失败
*/
extern "C" __declspec(dllexport) bool _stdcall VideoPlayer_SetOSDText(int nPort, int osdID, OSDParameter osdParam);/**
* 功能描述：设置所有的OSD文本（总共20行）
* @param nPort：播放通道号[0,31]
* @param para：osd属性
*
* @return 成功/失败
*/
extern "C" __declspec(dllexport) bool _stdcall VideoPlayer_SetAllOSDTexts(int nPort, OSDParameter osdParams[]);/**
* 功能描述：清除所有OSD文本
* @param nPort：播放通道号[0,31] 
*
* @return 成功/失败
*/
extern "C" __declspec(dllexport) bool _stdcall VideoPlayer_ClearOSDText(int nPort);/**
* 功能描述：设置解码缓存队列大小
* @param nPort：播放通道号[0,31]
* @param size：默认为10，设置过小会丢帧，设置过大可能会导致画面延迟
*
* @return 成功/失败
*/
extern "C" __declspec(dllexport) void _stdcall VideoPlayer_SetDecodedBufferSize(int nPort, int size);/**
* 功能描述：单帧往后播放 
* @param nPort：播放通道号[0,31]
*/
extern "C" __declspec(dllexport) bool  _stdcall VideoPlayer_NextFrame(int nPort);/**
* 功能描述：单帧往前播放 
* @param nPort：播放通道号[0,31]
*/
extern "C" __declspec(dllexport) bool  _stdcall VideoPlayer_PrevFrame(int nPort);/**
* 功能描述：跳转视频到某一时间位置 
* @param nPort：播放通道号[0,31]
* @param pos：视频位置百分比
*/
extern "C" __declspec(dllexport) bool  _stdcall VideoPlayer_SetPlayPos(int nPort,float pos);/**
* 功能描述：显示/隐藏当前系统时间
* @param nPort：播放通道号[0,31]
* @param visible：是否显示
* @param xPos：坐标位置X，宽度百分比
* @param yPos：坐标位置Y，高度百分比
* @param fontSize：字体大小，默认50
*/
extern "C" __declspec(dllexport) bool  _stdcall VideoPlayer_SetDateTime(int nPort,bool visible, float xPos, float yPos,int fontSize=50);/**
* 功能描述：当前解码完成数据回调
* @param nPort：播放通道号[0,31]
* @param pBuf：yuv数据指针
* @param nSize：数据大小
* @param pFrameInfo：帧信息
*/
typedef void(_stdcall* DecodeCallBack)(int nPort, const unsigned char* pBuf, int nSize, FrameInfo& pFrameInfo);/**
* 功能描述：设置解码回调函数
* @param nPort：播放通道号[0,31]
* @param pDecodeProc：回调函数
*/
extern "C" __declspec(dllexport) bool  _stdcall VideoPlayer_SetDecCallBack(int nPort, DecodeCallBack pDecodeProc);/**
* 功能描述：在显示句柄窗口中绘制文本、图形等
* @param nPort：播放通道号[0,31]
* @param hWnd：视频窗口句柄，用于创建GDI
* @param width：视频窗口宽度
* @param height：视频窗口高度
*/
typedef void(_stdcall* DrawCallBack)(int nPort, const void* hWnd,int width,int height);extern "C" __declspec(dllexport) bool  _stdcall VideoPlayer_SetDrawCallBack(int nPort, DrawCallBack pDrawProc);

 库支持C++，C#调用，以下是C#调用的方法：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using VideoPlayDemo.Onvif;
using static VideoPlayDemo.MYVideoPlay;namespace VideoPlayDemo
{public partial class Form1 : Form{const int PLAY_PORT1 = 0;const int PLAY_PORT2 = 1;public event MYVideoPlay.DecodeCallBack decodeCallBack;public event MYVideoPlay.DrawCallBack drawCallBack;bool[] isRecording = new bool[2];bool[] isOpened = new bool[2];MYVideoPlay.OSDParameter[] OSDParameters1 = new MYVideoPlay.OSDParameter[20];MYVideoPlay.OSDParameter[] OSDParameters2 = new MYVideoPlay.OSDParameter[20];public Form1(){InitializeComponent();Timer timer = new Timer();timer.Interval = 100;timer.Enabled = true;timer.Tick += Timer_Tick;decodeCallBack += new MYVideoPlay.DecodeCallBack(Form1_decodeCallBack);drawCallBack += new MYVideoPlay.DrawCallBack(Form1_drawCallBack);//初始化for (int i = 0; i < 20; i++){OSDParameters1[i] = new MYVideoPlay.OSDParameter();OSDParameters1[i].visible = false;OSDParameters1[i].text = "test中文"+i.ToString();OSDParameters1[i].fontSize = 100;OSDParameters1[i].fontFamily = 0;OSDParameters1[i].fontColor = new MYVideoPlay.RGBAColor(Color.White);OSDParameters1[i].backColor = new MYVideoPlay.RGBAColor(Color.Transparent);OSDParameters2[i] = new MYVideoPlay.OSDParameter();OSDParameters2[i].visible = false;OSDParameters2[i].text = "test中文" + i.ToString();OSDParameters2[i].fontSize = 100;OSDParameters2[i].fontFamily = 0;OSDParameters2[i].fontColor = new MYVideoPlay.RGBAColor(Color.Yellow);OSDParameters2[i].backColor = new MYVideoPlay.RGBAColor(Color.Transparent);}}#region 视频播放控制方法/// <summary>/// 打开视频/// </summary>/// <param name="port"></param>public bool OpenVideo(int port,string url,IntPtr intPtr){bool ret = false;ret = MYVideoPlay.VideoPlayer_SetDecCallBack(port, decodeCallBack);if (!ret){MessageBox.Show("设置解码回调函数失败！");return ret;}ret = MYVideoPlay.VideoPlayer_SetDrawCallBack(port, drawCallBack);if (!ret){MessageBox.Show("设置绘图回调函数失败！");return ret;}ret = MYVideoPlay.VideoPlayer_OpenVideo(port, url, intPtr);if (!ret){MessageBox.Show("打开视频失败！");return ret;}ret = MYVideoPlay.VideoPlayer_StartPlay(port,false);if (!ret){MessageBox.Show("播放失败！");return ret;}//叠加时间        //     ret = MYVideoPlay.VideoPlayer_SetDateTime(port, true, 0.01f, 0.01f,70);return ret;}/// <summary>/// 关闭视频/// </summary>/// <param name="port"></param>private bool CloseVideo(int port){return MYVideoPlay.VideoPlayer_CloseVideo(port);}/// <summary>/// 开始录制  帧率60/// </summary>/// <param name="port"></param>/// <param name="halfRate"></param>private bool StartRecord(int port,bool halfRate){bool ret = false;if(halfRate)ret = MYVideoPlay.VideoPlayer_SetRecordParameter(port, 60, 5, 60,1);elseret = MYVideoPlay.VideoPlayer_SetRecordParameter(port, 60, 5, 60, 0);string path = string.Format("d:\\video_{0}", port);ret = MYVideoPlay.VideoPlayer_StartRecord(port, path);if (!ret)MessageBox.Show("开启录制失败！");return ret;}/// <summary>/// 停止录制/// </summary>/// <param name="port"></param>private bool StopRecord(int port){bool ret = MYVideoPlay.VideoPlayer_StopRecord(port);return ret;}/// <summary>/// 截图/// </summary>/// <param name="port"></param>/// <returns></returns>private bool ShotImage(int port){bool ret = MYVideoPlay.VideoPlayer_ShotImage(port, "d:\\" + port.ToString(), MYVideoPlay.PictureFormat.JPEG);return ret;}int[] frameRates = new int[4];private void Form1_decodeCallBack(int nPort, IntPtr pBuf, int nSize, ref MYVideoPlay.FrameInfo pFrameInfo){frameRates[nPort] = pFrameInfo.frameRate;this.Invoke((Action)delegate{this.lbFPS1.Text = frameRates[0].ToString()+"fps";this.lbFPS2.Text = frameRates[1].ToString()+"fps";});}private void Form1_drawCallBack(int nPort, IntPtr hWnd, int width, int height){}#endregion/// <summary>/// 打开视频/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void btnOpenVideo_Click(object sender, EventArgs e){Button btn = sender as Button;int n = int.Parse(btn.Tag.ToString());if (isOpened[n])return;string url="";IntPtr intPtr= IntPtr.Zero;switch (n){case 0: url = textBox1.Text;intPtr = pnlVideo1.Handle; break;case 1: url = textBox2.Text;intPtr = pnlVideo2.Handle; break;}Task task = new Task(() =>{//网络直播流（非相机流）时设置更大的buffer进行缓存，否则出现马赛克MYVideoPlay.VideoPlayer_SetDecodedBufferSize(n, 250);isOpened[n] = OpenVideo(n,url,intPtr);});task.Start();}/// <summary>/// 关闭视频/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void btnCloseVideo_Click(object sender, EventArgs e){Button btn = sender as Button;int n = int.Parse(btn.Tag.ToString());if (!isOpened[n])return;bool ret = CloseVideo(n);isOpened[n] = !ret;}/// <summary>/// 开始录制/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void btnStartRecord_Click(object sender, EventArgs e){Button btn = sender as Button;int n = int.Parse(btn.Tag.ToString());if (isRecording[n] || !isOpened[n])return;if (n == 0)isRecording[n] = StartRecord(n, true);elseisRecording[n] = StartRecord(n, false);}/// <summary>/// 停止录制/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void btnStopRecord_Click(object sender, EventArgs e){Button btn = sender as Button;int n = int.Parse(btn.Tag.ToString());if (!isRecording[n] || !isOpened[n])return;bool ret = StopRecord(n);isRecording[n] = !ret;}/// <summary>/// 截图/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void btnShotImage_Click(object sender, EventArgs e){Button btn = sender as Button;int n = int.Parse(btn.Tag.ToString());ShotImage(n);}/// <summary>/// 叠加字符测试/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void Timer_Tick(object sender, EventArgs e){Random rd = new Random();bool ret = false;if (isOpened[PLAY_PORT1]){OSDParameters1[0].visible = OSDParameters1[1].visible = true;OSDParameters1[0].x = (float)rd.NextDouble();OSDParameters1[0].y = (float)rd.NextDouble();OSDParameters1[1].x = (float)rd.NextDouble();OSDParameters1[1].y = (float)rd.NextDouble();//ZYVideoPlay.VideoPlayer_SetAllOSDTexts(PLAY_PORT1, OSDParameters1);}if (isOpened[PLAY_PORT2]){OSDParameters2[0].visible = OSDParameters2[1].visible = true;OSDParameters2[0].x = (float)rd.NextDouble();OSDParameters2[0].y = (float)rd.NextDouble();OSDParameters2[1].x = (float)rd.NextDouble();OSDParameters2[1].y = (float)rd.NextDouble();//   ret = ZYVideoPlay.VideoPlayer_SetAllOSDTexts(PLAY_PORT2, OSDParameters2);}}private void timer1_Tick(object sender, EventArgs e){if (isRecording[PLAY_PORT1]){if (DateTime.Now.Millisecond < 500)lbRec1.Visible = true;elselbRec1.Visible = false;}elselbRec1.Visible = false;if (isRecording[PLAY_PORT2]){if (DateTime.Now.Millisecond < 500)lbRec2.Visible = true;elselbRec2.Visible = false;}elselbRec2.Visible = false;}private void Form1_FormClosing(object sender, FormClosingEventArgs e){for(int i=0;i<2;i++){if (isOpened[i])CloseVideo(i);}}}
}