流媒体-RTMP协议-librtmp库学习-c++多线程实现rtmp推流flv文件（三）

灰太狼 2023-01-08 16:19 440阅读 0赞

1.  [流媒体-RTMP协议-rtmpdump-flv封装解析（一）][-RTMP_-rtmpdump-flv]
2.  [流媒体-RTMP协议-librtmp库学习（二）][-RTMP_-librtmp]
3.  [流媒体-RTMP协议-librtmp库学习-c++多线程实现rtmp推流flv文件（三）][-RTMP_-librtmp_-c_rtmp_flv]

### 文章目录 ###

*   *   *  rtmppusher.h头文件
         *  rtmppusher.cpp 文件
         *  main.cpp
         *  源代码下载
         *  参考

### rtmppusher.h头文件 ###

/** * @projectName TestlibRtmp * @author wangbaojia * @date 2020-12-02 * @brief * * librtmp +nginx 实现flv推流(adobe rtmp协议) * * */
    
    
    #ifndef RTMPPUSHER_H
    #define RTMPPUSHER_H
    
    #include <QObject>
    #include <QThread>
    #include <QDebug>
    
    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include <stdint.h>
    
    #include <iostream>
    #include <atomic>
    #include <chrono>
    
    #ifndef WIN32
    #include <unistd.h>
    #endif
    
    #include "librtmp/rtmp.h"
    #include "librtmp/log.h"
    #include "librtmp/amf.h"
    
    #define HTON16(x) ((x >> 8 & 0xff)|(x << 8 & 0xff00))
    #define HTON24(x) ((x >> 16 & 0xff)|(x << 16 & 0xff0000)|(x & 0xff00))
    #define HTON32(x) ((x >> 24 & 0xff)|(x >> 8 & 0xff00)|(x << 8 & 0xff0000)|(x << 24 & 0xff000000))
    #define HTONTIME(x) ((x >> 16 & 0xff)|(x << 16 & 0xff0000)|(x & 0xff00)|(x & 0xff000000))
    
    
    class RTMPPusher : public QThread
    { 
        Q_OBJECT
    public:
        RTMPPusher();
        virtual ~RTMPPusher();
        /** * @brief InitRtmp * @param filename 待打开的文件 * @param url 推流url * @param packetsize 包大小 * @return */
        bool InitRtmp(std::string filename,std::string url,int packetsize);
    
        inline void CleanupSockets()
        { 
        #ifdef WIN32
            WSACleanup();
        #endif
        }
    
        inline int InitSockets()
        { 
        #ifdef WIN32
            WORD version;
            WSADATA wsaData;
    
            version = MAKEWORD(1, 1);
            return (WSAStartup(version, &wsaData) == 0);
        #else
            return TRUE;
        #endif
        }
    
        void Close();
        void Pause();
        bool ReadHeaderAndMetadata();
    
    protected:
    
        void run();
    
    private:
    
        std::string m_strFileName = "";
        std::string m_strUrl= "";
        FILE* m_pFp= nullptr;
        /** * @brief m_nFileSize off_t在64位的Linux系统中则会被编译为long long int */
        off_t m_nFileSize;
        /** * @brief m_nMetadataPos metadate数据位置 */
        off_t m_nMetadataPos;
    
        RTMP* m_pRtmp = nullptr;
        /** * @brief m_pRtmpPkt */
        RTMPPacket* m_pRtmpPkt = nullptr;
    
        std::atomic<bool> m_bIsExit;
        std::atomic<bool> m_bIsPause;
    
    };
    
    #endif // RTMPPUSHER_H

### rtmppusher.cpp 文件 ###

#include "rtmppusher.h"
    
    RTMPPusher::RTMPPusher()
    { 
        m_bIsExit = false;
        m_bIsPause = false;
    }
    
    
    RTMPPusher::~RTMPPusher()
    { 
    
    }
    
    bool RTMPPusher::InitRtmp(std::string filename,std::string url,int packetsize)
    { 
        m_pFp = fopen(filename.c_str(),"rb");
        if(!m_pFp)
        { 
            RTMP_LogPrintf("Open File Error\n");
            CleanupSockets();
            return false;
        }
    
        //初始化Socket
        if(!InitSockets())
        { 
            RTMP_LogPrintf("Init Socket Err\n");
            fclose(m_pFp);
            return false;
        }
    
        //为结构体“RTMP”分配内存
        m_pRtmp = RTMP_Alloc();
        if(!m_pRtmp)
        { 
            RTMP_LogPrintf("RTMP_Alloc failed\n");
            CleanupSockets();
            fclose(m_pFp);
            return false;
        }
    
        //初始化结构体“RTMP”中的成员变量
        /** 源码 void RTMP_Init(RTMP *r) { #ifdef CRYPTO if (!RTMP_TLS_ctx) RTMP_TLS_Init(); #endif memset(r, 0, sizeof(RTMP)); r->m_sb.sb_socket = -1; r->m_inChunkSize = RTMP_DEFAULT_CHUNKSIZE; r->m_outChunkSize = RTMP_DEFAULT_CHUNKSIZE; r->m_nBufferMS = 30000; r->m_nClientBW = 2500000; r->m_nClientBW2 = 2; r->m_nServerBW = 2500000; r->m_fAudioCodecs = 3191.0; r->m_fVideoCodecs = 252.0; r->Link.timeout = 30; r->Link.swfAge = 30; } */
        RTMP_Init(m_pRtmp);
        m_pRtmp->Link.timeout = 5; //默认为30秒
    
    
        if(!RTMP_SetupURL(m_pRtmp, const_cast<char*>(url.c_str())))
        { 
            RTMP_Log(RTMP_LOGERROR,"SetupURL Err\n");
            RTMP_Free(m_pRtmp);
            CleanupSockets();
            fclose(m_pFp);
            return false;
        }
    
        //发布流的时候必须要使用。如果不使用则代表接收流。
        RTMP_EnableWrite(m_pRtmp);
    
        //建立RTMP连接，创建一个RTMP协议规范中的NetConnection
        if(!RTMP_Connect(m_pRtmp,nullptr))
        { 
            RTMP_Log(RTMP_LOGERROR,"Connect Err\n");
            Close();
            return false;
        }
    
        //创建一个RTMP协议规范中的NetStream
        if (!RTMP_ConnectStream(m_pRtmp,0))
        { 
            RTMP_Log(RTMP_LOGERROR,"ConnectStream Err\n");
            Close();
            return false;
        }
    
        m_pRtmpPkt = (RTMPPacket*)malloc(sizeof(RTMPPacket));
        if(!m_pRtmpPkt)
        { 
            RTMP_Log(RTMP_LOGERROR,"malloc RTMPPacket Err\n");
            Close();
            return false;
        }
    
        int flag = RTMPPacket_Alloc(m_pRtmpPkt,packetsize);
        if(flag == 0)
        { 
            RTMP_Log(RTMP_LOGERROR,"RTMPPacket_Alloc Err\n");
            Close();
            return false;
        }
    
        RTMPPacket_Reset(m_pRtmpPkt);
    
        m_pRtmpPkt->m_hasAbsTimestamp = 0;
        m_pRtmpPkt->m_nChannel = 0x04;//快流id,0,1,2,作为保留;/* source channel */
    
    
        return true;
    }
    
    bool RTMPPusher::ReadHeaderAndMetadata()
    { 
    
        /** * @brief int fseek(FILE *stream, long offset, int fromwhere); * int fseeko(FILE *stream, off_t offset, int fromwhere); * int fseeko64(FILE *stream, off64_t offset, int fromwhere); * 这几个函数唯一的不同是offset的数据类型不同，相应的能够处理的偏移量的范围也就有大有小 * stream：文件指针 * fromwhere：偏移起始位置 * offset：偏移量 * 函数设置文件指针stream的位置。如果执行成功，stream将指向以fromwhere * 偏移起始位置：文件头0(SEEK_SET)，当前位置1(SEEK_CUR)，文件尾2(SEEK_END)）为基准， * 偏移offset（指针偏移量）个字节的位置。如果执行失败(比如offset超过文件自身大小)，则不改变stream指向的位置。 */
        fseek(m_pFp, 0, SEEK_END);//指针跳转到尾部
        /* Return the current position of STREAM. This function is a possible cancellation point and therefore not marked with __THROW. */
        //extern __off_t ftello (FILE *__stream) __wur;
        //获取文件字节大小
        m_nFileSize = ftello(m_pFp);
        //返回文件头部
        fseek(m_pFp, 0, SEEK_SET);
    
        size_t bufferSize = 0;
        char hbuf[16], *buffer = nullptr;
        char *metaHeader;	// meta data read from the file [out]
        uint32_t nMetaHeaderSize;	// length of metaHeader [out]
        double duration;
    
        if (m_nFileSize > 0)
        { 
            // verify FLV format and read header
            uint32_t prevTagSize = 0;
    
            // check we've got a valid FLV file to continue!
            // 9 字节头 + 4 字节prevTagSize为0的大小 = 13 字节
            if (fread(hbuf, 1, 13, m_pFp) != 13)
            { 
                RTMP_Log(RTMP_LOGERROR, "Couldn't read FLV file header!");
                return false;
            }
            if (hbuf[0] != 'F' || hbuf[1] != 'L' || hbuf[2] != 'V'
                    || hbuf[3] != 0x01)
            { 
                RTMP_Log(RTMP_LOGERROR, "Invalid FLV file!");
                return false;
            }
            //第五字节的第一位视频,第三位音频,两者都不存在直接退出
            if ((hbuf[4] & 0x05) == 0)
            { 
                RTMP_Log(RTMP_LOGERROR,
                         "FLV file contains neither video nor audio, aborting!");
                return false;
            }
            //头文件长度第6-9字节:4字节
            uint32_t dataOffset = AMF_DecodeInt32(hbuf + 5);
            //flv文件头解析结束
            fseek(m_pFp, dataOffset, SEEK_SET);
    
            //读取4字节 prevTagSize 此值应为0
            if (fread(hbuf, 1, 4, m_pFp) != 4)
            { 
                RTMP_Log(RTMP_LOGERROR, "Invalid FLV file: missing first prevTagSize!");
                return false;
            }
            prevTagSize = AMF_DecodeInt32(hbuf);
            if (prevTagSize != 0)
            { 
                RTMP_Log(RTMP_LOGWARNING,
                         "First prevTagSize is not zero: prevTagSize = 0x%08X",
                         prevTagSize);
            }
    
            // go through the file to find the meta data!
            m_nMetadataPos = dataOffset + 4;//m_nMetadataPos 指向tag body
            int bFoundMetaHeader = FALSE;
            //解析元数据
            while (m_nMetadataPos < m_nFileSize - 4 && !bFoundMetaHeader)
            { 
                fseeko(m_pFp, m_nMetadataPos, SEEK_SET);
                //读取tag body前四字节
                if (fread(hbuf, 1, 4, m_pFp) != 4)
                    break;
                //第一字节tag类型,第2-4共三字节表示tag文件长度,表示StreamID之后的数据长度
                uint32_t dataSize = AMF_DecodeInt24(hbuf + 1);
                //该tag是元数据
                if (hbuf[0] == 0x12)
                { 
                    if (dataSize > bufferSize)
                    { 
                        /* round up to next page boundary */
                        bufferSize = dataSize + 4095;
                        bufferSize ^= (bufferSize & 4095);
                        free(buffer);
                        buffer = (char*)malloc(bufferSize);
                        if (!buffer)
                            return false;
                    }
    
                    //跳过body头部
                    fseeko(m_pFp, m_nMetadataPos + 11, SEEK_SET);
                    //读取数据到buffer中
                    if (fread(buffer, 1, dataSize, m_pFp) != dataSize)
                        break;
    
                    AMFObject metaObj;
                    int nRes = AMF_Decode(&metaObj, buffer, dataSize, FALSE);
                    if (nRes < 0)
                    { 
                        RTMP_Log(RTMP_LOGERROR, "%s, error decoding meta data packet",
                                 __FUNCTION__);
                        break;
                    }
    
    #if 0
                    AVal metastring;
                    AMFProp_GetString(AMF_GetProp(&metaObj, NULL, 0), &metastring);
    
                    if (AVMATCH(&metastring, &av_onMetaData))
                    { 
                        AMF_Dump(&metaObj);
    
                        nMetaHeaderSize = dataSize;
                        if (metaHeader)
                            free(metaHeader);
                        metaHeader = (char *) malloc(nMetaHeaderSize);
                        memcpy(metaHeader, buffer, nMetaHeaderSize);
    
                        // get duration
                        AMFObjectProperty prop;
                        if (RTMP_FindFirstMatchingProperty
                                (&metaObj, &av_duration, &prop))
                        { 
                            duration = AMFProp_GetNumber(&prop);
                            RTMP_Log(RTMP_LOGDEBUG, "File has duration: %f", duration);
                        }
    
                        bFoundMetaHeader = TRUE;
                        break;
                    }
    #endif
                    break; //读取metadate跳出
    
                }
                //跳转到下一个tag
                m_nMetadataPos += (dataSize + 11 + 4);
            }
    
            free(buffer);
            if (!bFoundMetaHeader)
                RTMP_Log(RTMP_LOGWARNING, "Couldn't locate meta data!");
        }
        //回到metadata位置
        fseek(m_pFp,m_nMetadataPos,SEEK_SET);
        return true;
    
    }
    
    void RTMPPusher::Close()
    { 
        m_bIsExit = true;
    
        if(m_pRtmp)
        { 
            RTMP_Close(m_pRtmp);
            RTMP_Free(m_pRtmp);
        }
    
        CleanupSockets();
    
        if(m_pFp)
        { 
            fclose(m_pFp);
            m_pFp = nullptr;
        }
    
    }
    
    void RTMPPusher::Pause()
    { 
        m_bIsPause = true;
    }
    
    void RTMPPusher::run()
    { 
        //线程读取数据
        unsigned int pretime = 0;
        unsigned int videonum = 0;
        unsigned int audionum = 0;
    
        while(!m_bIsExit)
        { 
            if(m_bIsPause) //暂停
            { 
                msleep(1);
                continue;
            }
            if(!m_pRtmp)
            { 
                msleep(1);
                continue;
            }
    
            //从flv文件中读取数据
            /** * RTMPPacket包数据 * 1)0 类型的块长度为11 字节：时间戳3字节，消息长度3字节，消息类型1字节，消息流id 4字节。 * 2)扩展时间戳：零或四字节 * * flv文件的tag * 1)Tag 头部：11字节:类型1字节,长度3字节(StreamID之后的数据长度),时间戳3字节,扩展时间戳1字节,消息流id 3字节 * * */
            unsigned int timestamp;
            unsigned int length;
            unsigned char type;
            unsigned int streamid;
            unsigned int pretagsize;
    
            if(fread(&type,1,1,m_pFp) != 1) break;
    
            if(fread(&length,1,3,m_pFp) != 3) break;
            length = HTON24(length);
    
            if(fread(&timestamp,1,4,m_pFp) != 4) break;
            timestamp = HTONTIME(timestamp);
    
    
            if(fread(&streamid,1,3,m_pFp) != 3) break;
            streamid = HTON24(streamid);
    
            if(fread(m_pRtmpPkt->m_body,1,length,m_pFp) != length)
            { 
                RTMP_Log(RTMP_LOGERROR,"rtmp read data failed\n");
                break;
            }
    
            //读取4字节的tagsize大小
            if(fread(&pretagsize,1,4,m_pFp) != 4) break;
            pretagsize = HTON32(pretagsize);
    
            if(pretagsize != length + 11) break;
    
    
    
            m_pRtmpPkt->m_headerType = RTMP_PACKET_SIZE_LARGE;
            m_pRtmpPkt->m_nTimeStamp = timestamp; //时间戳
            m_pRtmpPkt->m_nBodySize = length; //消息长度
            m_pRtmpPkt->m_packetType = type; //消息类型
            m_pRtmpPkt->m_nInfoField2 = m_pRtmp->m_stream_id;  //消息流id
    
            unsigned int delay = timestamp - pretime;
    
    
            if(type == 0x08)
            { 
                qDebug()<<"type="<<type<<" audionum="<<audionum++
                       <<" length="<<length<<" tagsize="<<pretagsize<<" timestamp="<<timestamp
                      <<" delay="<<delay<<" streamid="<<streamid
                      <<" m_pRtmp->m_stream_id"<<m_pRtmp->m_stream_id;
            }
            
            if(type == 0x09)
            { 
                qDebug()<<"type="<<type<<" videonum="<<videonum++
                       <<" length="<<length<<" tagsize="<<pretagsize<<" timestamp="<<timestamp
                      <<" delay="<<delay<<" streamid="<<streamid
                      <<" m_pRtmp->m_stream_id"<<m_pRtmp->m_stream_id;
            }
    
            std::this_thread::sleep_for(std::chrono::milliseconds(delay));
    
            //判断rtmp连接是否正常
            if(!RTMP_IsConnected(m_pRtmp))
            { 
                RTMP_Log(RTMP_LOGERROR,"rtmp is not connect\n");
                break;
            }
            int result = RTMP_SendPacket(m_pRtmp,m_pRtmpPkt,0);
            pretime = timestamp;
        }
    }

### main.cpp ###

#include "rtmppusher.h"
    
    #include <string>
    #include <iostream>
    
    using namespace std;
    
    int main()
    { 
    
        RTMPPusher rtmppush;
        string filepath = "/home/ubuntu/data/video/source.200kbps.768x320.flv";
        string url = "rtmp://192.168.0.10:2020/live/livestream";
        int size = 64 * 1024;
        bool isinit = rtmppush.InitRtmp(filepath,url,size);
        cout<<"init statu="<<isinit<<endl;
        bool isreadhead = false;
        if(isinit)
        { 
            isreadhead = rtmppush.ReadHeaderAndMetadata();
        }
    
        cout<<"readhead success"<<endl;
        if(!isreadhead) return 0;
    
        rtmppush.start();
        rtmppush.wait();
        return 0;
    }

### [源代码下载][Link 1] ###

### 参考 ###

1.  rtmpdump2.3 中rtmpdump.c

[-RTMP_-rtmpdump-flv]: https://blog.csdn.net/bwangk/article/details/112714806
[-RTMP_-librtmp]: https://blog.csdn.net/bwangk/article/details/112802823
[-RTMP_-librtmp_-c_rtmp_flv]: https://blog.csdn.net/bwangk/article/details/112881465
[Link 1]: https://download.csdn.net/download/bwangk/14891766