开发实现C++ RTMP直播推流sdk

来源：互联网发布：淘宝返现卡片编辑：程序博客网时间：2024/05/18 13:45

前言

rtmp即Real Time Messaging Protocol（实时消息传输协议）的首字母缩写，它是由Adobe公司提出的一种应用层的协议，用来解决多媒体数据传输流的多路复用（Multiplexing）和分包（packetizing）的问题。
目前现在流行的是直播技术，大部分都是采用该协议；本文档重点用C++开发实现了RTMP直播推流sdk部分，并使之跨平台通用。
简单的结构如下：

主要接口设计

class  SRLibRtmpInterface{public:        virtual int Connect(const char* url) = 0;    virtual int StartRtmpSend(int EnableVideo, int EnableAudio) = 0;    virtual int InitVideoParams(SR_VideoCodecSetting videoCodecSetting) = 0;    virtual int InitAudioParams(SR_AudioCodecSetting audioCodecSetting) = 0;    virtual int SetAudioDelay(int msecs) = 0;    virtual int StartRecordMp4File() = 0;    virtual int StopRecordMp4File() = 0;    virtual int SendYUVCapture(unsigned char * yuvframe, int  yuvframeLen, unsigned long nTimeStamp) = 0;    virtual int SendPCMFrame(unsigned char * pcmframe, int  frameLen, unsigned long nTimeStamp) = 0;    virtual int Close() = 0;    SRLibRtmpInterface(){};    virtual ~SRLibRtmpInterface() = 0;}

用户直接设置需要连接的url 例如腾讯云的推流地址
用户直接输入yuv和pcm数据，推流sdk打包推送到各个平台
用户可以录制本地推送的流到mp4 文件

H264编码

int i_frame_size_byte = x264_encoder_encode(_enc, &nalu, &num_nals, &xpic, &oxpic);    if(i_frame_size_byte < 0)    {        xbase::XLog::Printf("EncodeX264", xbase::XLOG_ERR, "x264 encode failed");        return -1;    }    if(num_nals <= 0)    {        xbase::XLog::Printf("EncodeX264", xbase::XLOG_ERR, "frame delayed in encoder.");        return -2;    }    _frameNbr++;    for(int i = 0; i < num_nals; i++)    {           //unsigned char nalu_header[4] = { 0, 0, 0, 1 };            //fwrite(nalu_header, 1, 4, fp_h264);            //fwrite(nalu[i].p_payload, 1, nalu[i].i_payload, fp_h264);        x264_nal_t &nal = nalu[i];        if (nal.i_type == NAL_SPS)        {            uint8_t * h264Data = nal.p_payload;            if (video_broadcaster)            {                base::DataBuffer* RecvdataBuf = new base::DataBuffer(h264Data, nal.i_payload);                video_broadcaster->PreSendVideoDataPacket(RecvdataBuf, nTimeStamp, true);            }        }        if (nal.i_type == NAL_PPS)        {            uint8_t * h264Data = nal.p_payload;            if (video_broadcaster)            {                base::DataBuffer* RecvdataBuf = new base::DataBuffer(h264Data, nal.i_payload);                video_broadcaster->PreSendVideoDataPacket(RecvdataBuf, nTimeStamp, true);            }        }        if (nal.i_type == NAL_SLICE_IDR)        {            uint8_t * h264Data = nal.p_payload;            if (video_broadcaster)            {                base::DataBuffer* RecvdataBuf = new base::DataBuffer(h264Data, nal.i_payload);                video_broadcaster->PreSendVideoDataPacket(RecvdataBuf, nTimeStamp, true);            }        }        if (nal.i_type == NAL_SLICE)        {            uint8_t * h264Data = nal.p_payload;            if (video_broadcaster)            {                base::DataBuffer* RecvdataBuf = new base::DataBuffer(h264Data, nal.i_payload);                video_broadcaster->PreSendVideoDataPacket(RecvdataBuf, nTimeStamp, false);            }        }    }

分发器

本sdk加入了分发器的概念，同一个流可以推动多个平台

rtmp打包

RTMP 协议栈的实现，这里使用的 srs-libRTMP，它提供的使用demo很多，代码设计也很精炼

联系

点击链接加入群【rtmp直播交流学习合作】：https://jq.qq.com/?_wv=1027&k=4Aqm21F
qq群号：559425694
email:zhanchonglongba@126.com/690759587

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