本文轉自EasyDarwin團隊Kim的博客：http://blog.csdn.net/jinlong0603
Demo項目介紹
EasyRTMP Demo代碼下載地址https://github.com/EasyDarwin/EasyRTMP
本文介紹Demo中EasyRTMP_SDK的項目。該項目是通過調用IP Camera自己的SDK獲取到音視頻流，然后通過libEasyRTMP推送到RTMP服務器進行直播。這樣就可以將普通的不支持RTMP的IP Camera接入RTMP服務器進行直播推送。該Demo程序可以交叉編譯內置到IP Camera內部，或者在Windows或者其他系統中執行此Demo拉取IP Camera的數據流再推送到RTMP服務器。
Github中Demo里面用的IP Camera的SDK是EasyDarwin官網賣的海芯威視的IP Camera。如果想接入其他家的IP Camera（如海康、大華等）可自己將SDK庫及調用方式換成相應的版本。
代碼解析
下面是IP Camera SDK 數據回調函數的部分，解析回調出來的數據並使用libEasyRTMP庫進行RTMP推送。關於回調出來的音頻數據如果不是AAC格式，可以通過EasyDarwin團隊提供的開源的EasyAACEncoder將其轉成AAC格式再推送，當然使用其他的方式只要能轉成正確的AAC格式就可以。
HI_S32 NETSDK_APICALL OnStreamCallback(HI_U32 u32Handle,
HI_U32 u32DataType,
HI_U8* pu8Buffer,
HI_U32 u32Length,
HI_VOID* pUserData
)
{
HI_S_AVFrame* pstruAV = HI_NULL;
HI_S_SysHeader* pstruSys = HI_NULL;
if (u32DataType == HI_NET_DEV_AV_DATA)
{
pstruAV = (HI_S_AVFrame*)pu8Buffer;
if (pstruAV->u32AVFrameFlag == HI_NET_DEV_VIDEO_FRAME_FLAG)
{
if(g_RtmpHandle == 0 ) return 0;
if(pstruAV->u32AVFrameLen > 0)
{
unsigned char* pbuf = (unsigned char*)(pu8Buffer+sizeof(HI_S_AVFrame));
EASY_AV_Frame avFrame;
memset(&avFrame, 0x00, sizeof(EASY_AV_Frame));
avFrame.u32AVFrameLen = pstruAV->u32AVFrameLen;
avFrame.pBuffer = (unsigned char*)pbuf;
avFrame.u32VFrameType = (pstruAV->u32VFrameType==HI_NET_DEV_VIDEO_FRAME_I)?EASY_SDK_VIDEO_FRAME_I:EASY_SDK_VIDEO_FRAME_P;
avFrame.u32AVFrameFlag = EASY_SDK_VIDEO_FRAME_FLAG;
avFrame.u32TimestampSec = pstruAV->u32AVFramePTS/1000;
avFrame.u32TimestampUsec = (pstruAV->u32AVFramePTS%1000)*1000;
EasyRTMP_SendPacket(g_RtmpHandle, &avFrame);
}
}
else
if (pstruAV->u32AVFrameFlag == HI_NET_DEV_AUDIO_FRAME_FLAG)
{
if(g_RtmpHandle == 0 ) return 0;
EASY_AV_Frame avFrame;
memset(&avFrame, 0x00, sizeof(EASY_AV_Frame));
avFrame.u32AVFrameFlag = EASY_SDK_AUDIO_FRAME_FLAG;
if(pstruAV->u32AVFrameLen <= 4) return 0;
if(EasyInitAACEncoder(EASY_SDK_AUDIO_CODEC_G711A) == 0)
{
memset(m_pAACEncBufer, 0, 64*1024);
unsigned int iAACBufferLen = 0;
unsigned char* pbuf = (unsigned char*)(pu8Buffer+sizeof(HI_S_AVFrame)) + 4;
if(Easy_AACEncoder_Encode(g_pAACEncoderHandle, (unsigned char*)pbuf, pstruAV->u32AVFrameLen-4, m_pAACEncBufer, &iAACBufferLen) > 0)
{
avFrame.pBuffer = (Easy_U8*)(m_pAACEncBufer);
avFrame.u32AVFrameLen = iAACBufferLen;
avFrame.u32TimestampSec = pstruAV->u32AVFramePTS/1000;
avFrame.u32TimestampUsec = (pstruAV->u32AVFramePTS%1000)*1000;
EasyRTMP_SendPacket(g_RtmpHandle, &avFrame);
}
}
}
}
else
if (u32DataType == HI_NET_DEV_SYS_DATA)
{
pstruSys = (HI_S_SysHeader*)pu8Buffer;
printf("Video W:%u H:%u Audio: %u \n", pstruSys->struVHeader.u32Width, pstruSys->struVHeader.u32Height, pstruSys->struAHeader.u32Format);
}
return HI_SUCCESS;
}
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