A method to judge the frame type of H.264

H264
The structure of Nalu is Nalu, and the structure of Nalu is nal head +rbsp. The data flow in actual transmission is shown in the figure:
Here is the picture description
The nal header accounts for one byte, and the lower 5 bit bits represent the nal type, as shown in the following table:

RBSP is the original byte sequence load.

If the nal type is 5, the frame is I frame, i.e. keyframe, and non key frame (P frame...) when type is 1.

In the actual H264 data frame, the nal type of the frame is usually preceded by a 00, 001 or 00001 separator. Generally speaking, the first frame data compiled by the encoder is PPS and SPS, followed by frame I, and then P frame

Easypusher/easytmp video streaming push

Easypusher and easytmp are used to obtain H264 video stream and audio video stream to local as video source by calling camera SDK, pulling RTSP stream, reading MP4 file, etc., and then pushing them to streaming media server by RTSP and RTMP. They are all video streaming push programs that support windows, Linux, Android, IOS, arm and other platforms.

The following describes how they distinguish I frame and P frame after they get the video stream to local, and then push them:
//This code reads H264 data from the file and pushes it to the server
unsigned char *ptr=new unsigned char [sample_ size];
fread(ptr, sample_ size, 1, g_ fin);
//Write a frame of data - can be pushed directly on the network
//fwrite(ptr, sample_ size, 1, fout);
EASY_ AV_ Frame   avFrame;
memset(&avFrame, 0x00, sizeof(EASY_ AV_ Frame));
/*
*The first 4 bytes of PTR are frame division character 0000001, and the fifth byte is nal type
*/
unsigned char naltype = ( (unsigned char)ptr[4] & 0x1F);
avFrame.pBuffer  = (unsigned char*)ptr;
avFrame.u32AVFrameLen = sample_ size;
avFrame.u32VFrameType = (naltype==0x05)? EASY_ SDK_ VIDEO_ FRAME_ I:EASY_ SDK_ VIDEO_ FRAME_ P;
avFrame.u32AVFrameFlag = EASY_ SDK_ VIDEO_ FRAME_ FLAG;
avFrame.u32TimestampSec = lTimeStamp/1000000;
avFrame.u32TimestampUsec = (lTimeStamp%1000000);
If the video source is not a file, but an IPcamera or RTSP stream, they may have already informed the current frame whether the current frame is an I frame or a P frame in their video streaming back modulation, so the steps to judge the nal type are omitted.
HI_ S32 NETSDK_ APICALL OnStreamCallback(HI_ U32 u32handle, / * handle*/
HI_ U32 u32datatype, / * data type, video or audio data or audio video composite data*/
HI_ U8* pu8buffer, / * data contains frame header*/
HI_ U32 u32length, / * data length*/
HI_ Void* puserdata / * user data*/
)
{
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(fPusherHandle == 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;
EasyPusher_ PushFrame(fPusherHandle, &avFrame);
}  
}
else
if (pstruAV->u32AVFrameFlag == HI_ NET_ DEV_ AUDIO_ FRAME_ FLAG)
{
if(fPusherHandle == 0 ) return 0;
if(pstruAV->u32AVFrameLen > 0)
{
//Different IPcamera, the data header is different here, and the corresponding size needs to be skipped according to their SDK. Some may not have custom data
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-4;// Remove the manufacturer-defined 4-byte header
avFrame.pBuffer  = (unsigned char*)pbuf+4;
avFrame.u32AVFrameFlag = EASY_ SDK_ AUDIO_ FRAME_ FLAG;
avFrame.u32TimestampSec = pstruAV->u32AVFramePTS/1000;
avFrame.u32TimestampUsec = (pstruAV->u32AVFramePTS%1000)*1000;
EasyPusher_ PushFrame(fPusherHandle, &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;
}
With data source, you can push RTSP and RTMP live by calling libeasypusher or libeasyrtmp!

 

 

 

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