/******************************************
step 2: Start to get streams of each channel.
******************************************/
while (HI_TRUE == pstPara->bThreadStart)
{
FD_ZERO(&read_fds);
for (i = ; i < s32ChnTotal; i++)
{
FD_SET(VencFd[i], &read_fds);
} TimeoutVal.tv_sec = ;
TimeoutVal.tv_usec = ;
s32Ret = select(maxfd + , &read_fds, NULL, NULL, &TimeoutVal);//select非阻塞
if (s32Ret < )
{
SAMPLE_PRT("select failed!\n");
break;
}
else if (s32Ret == )
{
SAMPLE_PRT("get venc stream time out, exit thread\n");
continue;
}
else
{
for (i = ; i < s32ChnTotal; i++)
{
if (FD_ISSET(VencFd[i], &read_fds))
{
/*******************************************************
step 2.1 : query how many packs in one-frame stream.
*******************************************************/
memset(&stStream, , sizeof(stStream));
s32Ret = HI_MPI_VENC_Query(i, &stStat);
if (HI_SUCCESS != s32Ret)
{
SAMPLE_PRT("HI_MPI_VENC_Query chn[%d] failed with %#x!\n", i, s32Ret);
break;
} /*******************************************************
step 2.2 :suggest to check both u32CurPacks and u32LeftStreamFrames at the same time,for example:
if(0 == stStat.u32CurPacks || 0 == stStat.u32LeftStreamFrames)
{
SAMPLE_PRT("NOTE: Current frame is NULL!\n");
continue;
}
*******************************************************/
if( == stStat.u32CurPacks)
{
SAMPLE_PRT("NOTE: Current frame is NULL!\n");
continue;
}
/*******************************************************
step 2.3 : malloc corresponding number of pack nodes.
*******************************************************/
stStream.pstPack = (VENC_PACK_S*)malloc(sizeof(VENC_PACK_S) * stStat.u32CurPacks);
if (NULL == stStream.pstPack)
{
SAMPLE_PRT("malloc stream pack failed!\n");
break;
} /*******************************************************
step 2.4 : call mpi to get one-frame stream
*******************************************************/
stStream.u32PackCount = stStat.u32CurPacks;
s32Ret = HI_MPI_VENC_GetStream(i, &stStream, HI_TRUE);
if (HI_SUCCESS != s32Ret)
{
free(stStream.pstPack);
stStream.pstPack = NULL;
SAMPLE_PRT("HI_MPI_VENC_GetStream failed with %#x!\n", \
s32Ret);
break;
} /*******************************************************
step 2.5 : save frame to file
*******************************************************/
s32Ret = SAMPLE_COMM_VENC_SaveStream(enPayLoadType[i], pFile[i], &stStream);
if (HI_SUCCESS != s32Ret)
{
free(stStream.pstPack);
stStream.pstPack = NULL;
SAMPLE_PRT("save stream failed!\n");
break;
}
/*******************************************************
step 2.6 : release stream
*******************************************************/
s32Ret = HI_MPI_VENC_ReleaseStream(i, &stStream);
if (HI_SUCCESS != s32Ret)
{
free(stStream.pstPack);
stStream.pstPack = NULL;
break;
}
/*******************************************************
step 2.7 : free pack nodes
*******************************************************/
free(stStream.pstPack);
stStream.pstPack = NULL;
}
}
重点在这里,调用API获取H.264视频流并保存
/*******************************************************
step 2.4 : call mpi to get one-frame stream
*******************************************************/
stStream.u32PackCount = stStat.u32CurPacks;
s32Ret = HI_MPI_VENC_GetStream(i, &stStream, HI_TRUE);
if (HI_SUCCESS != s32Ret)
{
free(stStream.pstPack);
stStream.pstPack = NULL;
SAMPLE_PRT("HI_MPI_VENC_GetStream failed with %#x!\n", \
s32Ret);
break;
} /*******************************************************
step 2.5 : save frame to file
*******************************************************/
s32Ret = SAMPLE_COMM_VENC_SaveStream(enPayLoadType[i], pFile[i], &stStream);
if (HI_SUCCESS != s32Ret)
{
free(stStream.pstPack);
stStream.pstPack = NULL;
SAMPLE_PRT("save stream failed!\n");
break;
}
1)HI_MPI_VENC_GetStream(i, &stStream, HI_TRUE);
HiMPP IPC V2.0 媒体处理软件开发参考P540
2）s32Ret = SAMPLE_COMM_VENC_SaveStream(enPayLoadType[i], pFile[i], &stStream);