read H264 Nal

从264文件中读取Nal,一般用于测试的时候H264输入源：

参考：https://blog.csdn.net/leixiaohua1020/article/details/17933821

分辨率较大的话需要修改 READH264_MAXFRAME_SIZE，

#include <stdio.h>
#include <stdlib.h>
#include <string.h>#define PTR_NULL (void *)0#define _RET_OK         0
#define _RET_ERR        -1
#define _RET_MEM        -2
#define _RET_PARAM      -3
#define _RET_FILE       -4
#define _RET_SUPPFRAME  -5#define READH264_MAGIC          0x48323634
#define READH264_MAXFRAME_SIZE  1920*1080*3/2
#define READH264_CACHE_SIZE     (READH264_MAXFRAME_SIZE + 16)#define H264CHECK_RET(ret)   if(ret < 0) {return ret;}typedef struct stru_READHANDLE
{int iMagic;FILE *fp;int bFileEnd;int iNaluEndPos;int iCachePos;int iCacheSize;int iFrameSize;unsigned char *pucCache;unsigned char *pucFrame;
}ST_READHANDLE;static int FindStartCode(unsigned char *scData)
{if ((0==scData[0]) && (0==scData[1]) && (((0==scData[2]) && (1 == scData[3])) || (1==scData[2])) ){return 1;}return 0;
}static int GetNaluDataLen(int startPos, int h264BitsSize, unsigned char *h264Bits)
{int parsePos = 0;parsePos = startPos;while (parsePos < h264BitsSize){if (FindStartCode(&h264Bits[parsePos])){return parsePos - startPos;}else{parsePos++;}}return parsePos - startPos; // if file is end
}static int initReadHandle(ST_READHANDLE **pphandle)
{ST_READHANDLE *phandle = (ST_READHANDLE*)malloc(sizeof(ST_READHANDLE));if (NULL == phandle) return _RET_MEM;memset(phandle, 0, sizeof(ST_READHANDLE));phandle->iMagic = READH264_MAGIC;phandle->pucCache = malloc(READH264_CACHE_SIZE);if (NULL == phandle->pucCache){free(phandle);return _RET_MEM;}phandle->iCacheSize = READH264_CACHE_SIZE;phandle->pucFrame = malloc(READH264_MAXFRAME_SIZE);if (NULL == phandle->pucFrame){free(phandle->pucCache);free(phandle);return _RET_MEM;}phandle->iFrameSize = READH264_MAXFRAME_SIZE;*pphandle = phandle;printf("init ok %p\n",*pphandle);return _RET_OK;
}static int checkHandle(ST_READHANDLE **pphandle)
{if (NULL == pphandle)  return _RET_ERR;if (NULL == *pphandle)  H264CHECK_RET(initReadHandle(pphandle));if ((READH264_MAXFRAME_SIZE != (*pphandle)->iFrameSize))  return _RET_PARAM;return _RET_OK;
}static int read246File(ST_READHANDLE *phandle, unsigned char *pucfileName)
{int iReadLen = 0;if (phandle->bFileEnd)   return _RET_OK;if (NULL == phandle->fp){if ((NULL == pucfileName) || (strlen((const char *)pucfileName) <=0)) return _RET_PARAM;phandle->fp = fopen((const char *)pucfileName,"rb");if (NULL == phandle->fp)   return _RET_FILE;}iReadLen = fread(&phandle->pucCache[phandle->iCachePos], 1, (phandle->iCacheSize - phandle->iCachePos), phandle->fp);if (iReadLen != phandle->iCacheSize - phandle->iCachePos){fclose(phandle->fp);phandle->fp = NULL;phandle->bFileEnd = 1;if (iReadLen < 0)  iReadLen = 0;}phandle->iCachePos += iReadLen;return _RET_OK;
}static int getFrameLen(ST_READHANDLE *phandle)
{if (FindStartCode(phandle->pucCache))return GetNaluDataLen(3, phandle->iCachePos, phandle->pucCache) + 3;return _RET_ERR;
}static int Get246Frame(ST_READHANDLE *phandle, unsigned char **ppbuf, int *iLen)
{int iRet = 0;*iLen = 0;if (phandle->iCachePos <= 0){printf("read end CacheLen:%d\n", phandle->iCachePos);return 0;}iRet = getFrameLen(phandle);H264CHECK_RET(iRet);if (iRet > READH264_MAXFRAME_SIZE)return _RET_SUPPFRAME;memcpy(phandle->pucFrame, phandle->pucCache, iRet);if (phandle->iCachePos > iRet){memmove(phandle->pucCache, phandle->pucCache+iRet, phandle->iCachePos-iRet);phandle->iCachePos = phandle->iCachePos - iRet;}else{printf("read end CacheLen:%d FrameLen:%d\n",phandle->iCachePos, iRet);phandle->iCachePos = 0;}*ppbuf = phandle->pucFrame;*iLen = iRet;return iRet;
}int read264Nalu(void **pphandle, unsigned char *pucfileName,unsigned char **ppbuf, int *iLen)
{if ((NULL == ppbuf) || (NULL == iLen))return _RET_PARAM;H264CHECK_RET(checkHandle((ST_READHANDLE **)pphandle));//printf("check ok %p-%p \n",pphandle, *pphandle);H264CHECK_RET(read246File((ST_READHANDLE *)*pphandle, pucfileName));return Get246Frame(*pphandle, ppbuf, iLen);
}int releaseReadHanle(void **pphandle)
{ST_READHANDLE *phandle = NULL;if ((NULL == pphandle) && (NULL == *pphandle))return _RET_ERR;phandle = *pphandle;if (phandle->fp)fclose(phandle->fp);if (phandle->pucCache)free(phandle->pucCache);if (phandle->pucFrame)free(phandle->pucFrame);free(phandle);*pphandle = NULL;printf("releaseReadHanle\n");return _RET_OK;
}#if 0
int main(int argc, char *argv[])
{void *pReadHandle = NULL;unsigned char *pucReadFrame = NULL;int iFrameLen = 0;FILE *fp = fopen(argv[2], "wb");if (!fp){printf("open file[%s] error!\n", argv[2]);return -1;}while (read264Nalu(&pReadHandle,argv[1], &pucReadFrame, &iFrameLen) > 0){printf("Get FrameLen:%d \n",iFrameLen);fwrite(pucReadFrame, 1, iFrameLen, fp);}releaseReadHanle(&pReadHandle);fclose(fp);return 0;
}
#endif

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