海思3518EV200 SDK中获取和保存H.264码流详解 

  1     /******************************************
  2      step 2:  Start to get streams of each channel.
  3     ******************************************/
  4     while (HI_TRUE == pstPara->bThreadStart)
  5     {
  6         FD_ZERO(&read_fds);
  7         for (i = 0; i < s32ChnTotal; i++)
  8         {
  9             FD_SET(VencFd[i], &read_fds);
 10         }
 11 
 12         TimeoutVal.tv_sec  = 2;
 13         TimeoutVal.tv_usec = 0;
 14         s32Ret = select(maxfd + 1, &read_fds, NULL, NULL, &TimeoutVal);//select非阻塞
 15         if (s32Ret < 0)
 16         {
 17             SAMPLE_PRT("select failed!\n");
 18             break;
 19         }
 20         else if (s32Ret == 0)
 21         {
 22             SAMPLE_PRT("get venc stream time out, exit thread\n");
 23             continue;
 24         }
 25         else
 26         {
 27             for (i = 0; i < s32ChnTotal; i++)
 28             {
 29                 if (FD_ISSET(VencFd[i], &read_fds))
 30                 {
 31                     /*******************************************************
 32                      step 2.1 : query how many packs in one-frame stream.
 33                     *******************************************************/
 34                     memset(&stStream, 0, sizeof(stStream));
 35                     s32Ret = HI_MPI_VENC_Query(i, &stStat);
 36                     if (HI_SUCCESS != s32Ret)
 37                     {
 38                         SAMPLE_PRT("HI_MPI_VENC_Query chn[%d] failed with %#x!\n", i, s32Ret);
 39                         break;
 40                     }
 41                     
 42                     /*******************************************************
 43                     step 2.2 :suggest to check both u32CurPacks and u32LeftStreamFrames at the same time,for example:
 44                      if(0 == stStat.u32CurPacks || 0 == stStat.u32LeftStreamFrames)
 45                      {
 46                         SAMPLE_PRT("NOTE: Current  frame is NULL!\n");
 47                         continue;
 48                      }
 49                     *******************************************************/
 50                     if(0 == stStat.u32CurPacks)
 51                     {
 52                           SAMPLE_PRT("NOTE: Current  frame is NULL!\n");
 53                           continue;
 54                     }
 55                     /*******************************************************
 56                      step 2.3 : malloc corresponding number of pack nodes.
 57                     *******************************************************/
 58                     stStream.pstPack = (VENC_PACK_S*)malloc(sizeof(VENC_PACK_S) * stStat.u32CurPacks);
 59                     if (NULL == stStream.pstPack)
 60                     {
 61                         SAMPLE_PRT("malloc stream pack failed!\n");
 62                         break;
 63                     }
 64                     
 65                     /*******************************************************
 66                      step 2.4 : call mpi to get one-frame stream
 67                     *******************************************************/
 68                     stStream.u32PackCount = stStat.u32CurPacks;
 69                     s32Ret = HI_MPI_VENC_GetStream(i, &stStream, HI_TRUE);
 70                     if (HI_SUCCESS != s32Ret)
 71                     {
 72                         free(stStream.pstPack);
 73                         stStream.pstPack = NULL;
 74                         SAMPLE_PRT("HI_MPI_VENC_GetStream failed with %#x!\n", \
 75                                s32Ret);
 76                         break;
 77                     }
 78 
 79                     /*******************************************************
 80                      step 2.5 : save frame to file
 81                     *******************************************************/
 82                     s32Ret = SAMPLE_COMM_VENC_SaveStream(enPayLoadType[i], pFile[i], &stStream);
 83                     if (HI_SUCCESS != s32Ret)
 84                     {
 85                         free(stStream.pstPack);
 86                         stStream.pstPack = NULL;
 87                         SAMPLE_PRT("save stream failed!\n");
 88                         break;
 89                     }
 90                     /*******************************************************
 91                      step 2.6 : release stream
 92                     *******************************************************/
 93                     s32Ret = HI_MPI_VENC_ReleaseStream(i, &stStream);
 94                     if (HI_SUCCESS != s32Ret)
 95                     {
 96                         free(stStream.pstPack);
 97                         stStream.pstPack = NULL;
 98                         break;
 99                     }
100                     /*******************************************************
101                      step 2.7 : free pack nodes
102                     *******************************************************/
103                     free(stStream.pstPack);
104                     stStream.pstPack = NULL;
105                 }
106             }

重点在这里,调用API获取H.264视频流并保存

 1                     /*******************************************************
 2                      step 2.4 : call mpi to get one-frame stream
 3                     *******************************************************/
 4                     stStream.u32PackCount = stStat.u32CurPacks;
 5                     s32Ret = HI_MPI_VENC_GetStream(i, &stStream, HI_TRUE);
 6                     if (HI_SUCCESS != s32Ret)
 7                     {
 8                         free(stStream.pstPack);
 9                         stStream.pstPack = NULL;
10                         SAMPLE_PRT("HI_MPI_VENC_GetStream failed with %#x!\n", \
11                                s32Ret);
12                         break;
13                     }
14 
15                     /*******************************************************
16                      step 2.5 : save frame to file
17                     *******************************************************/
18                     s32Ret = SAMPLE_COMM_VENC_SaveStream(enPayLoadType[i], pFile[i], &stStream);
19                     if (HI_SUCCESS != s32Ret)
20                     {
21                         free(stStream.pstPack);
22                         stStream.pstPack = NULL;
23                         SAMPLE_PRT("save stream failed!\n");
24                         break;
25                     }

 

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);

 

posted on 2018-11-24 21:06  平凡的世界&&技术博客  阅读(968)  评论(0)  编辑  收藏  举报

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