H264视频码流分解为NALU数据代码

// 贴出 雷晓骅的代码#include <stdio.h>  #include <stdlib.h>  #include <string.h>  typedef enum {    NALU_TYPE_SLICE = 1,    NALU_TYPE_DPA = 2,    NALU_TYPE_DPB = 3,    NALU_TYPE_DPC = 4,    NALU_TYPE_IDR = 5,    NALU_TYPE_SEI = 6,    NALU_TYPE_SPS = 7,    NALU_TYPE_PPS = 8,    NALU_TYPE_AUD = 9,    NALU_TYPE_EOSEQ = 10,    NALU_TYPE_EOSTREAM = 11,    NALU_TYPE_FILL = 12,} NaluType;typedef enum {    NALU_PRIORITY_DISPOSABLE = 0,    NALU_PRIRITY_LOW = 1,    NALU_PRIORITY_HIGH = 2,    NALU_PRIORITY_HIGHEST = 3} NaluPriority;typedef struct{    int startcodeprefix_len;      //! 4 for parameter sets and first slice in picture, 3 for everything else (suggested)      unsigned len;                 //! Length of the NAL unit (Excluding the start code, which does not belong to the NALU)      unsigned max_size;            //! Nal Unit Buffer size      int forbidden_bit;            //! should be always FALSE      int nal_reference_idc;        //! NALU_PRIORITY_xxxx      int nal_unit_type;            //! NALU_TYPE_xxxx          char *buf;                    //! contains the first byte followed by the EBSP  } NALU_t;FILE *h264bitstream = NULL;                //!< the bit stream file  int info2 = 0, info3 = 0;static int FindStartCode2(unsigned char *Buf) {    if (Buf[0] != 0 || Buf[1] != 0 || Buf[2] != 1) return 0; //0x000001?      else return 1;}static int FindStartCode3(unsigned char *Buf) {    if (Buf[0] != 0 || Buf[1] != 0 || Buf[2] != 0 || Buf[3] != 1) return 0;//0x00000001?      else return 1;}int GetAnnexbNALU(NALU_t *nalu) {    int pos = 0;    int StartCodeFound, rewind;    unsigned char *Buf;    if ((Buf = (unsigned char*)calloc(nalu->max_size, sizeof(char))) == NULL)        printf("GetAnnexbNALU: Could not allocate Buf memory\n");    nalu->startcodeprefix_len = 3;    if (3 != fread(Buf, 1, 3, h264bitstream)) {        free(Buf);        return 0;    }    info2 = FindStartCode2(Buf);    if (info2 != 1) {        if (1 != fread(Buf + 3, 1, 1, h264bitstream)) {            free(Buf);            return 0;        }        info3 = FindStartCode3(Buf);        if (info3 != 1) {            free(Buf);            return -1;        }        else {            pos = 4;            nalu->startcodeprefix_len = 4;        }    }    else {        nalu->startcodeprefix_len = 3;        pos = 3;    }    StartCodeFound = 0;    info2 = 0;    info3 = 0;    while (!StartCodeFound) {        if (feof(h264bitstream)) {            nalu->len = (pos - 1) - nalu->startcodeprefix_len;            memcpy(nalu->buf, &Buf[nalu->startcodeprefix_len], nalu->len);            nalu->forbidden_bit = nalu->buf[0] & 0x80; //1 bit              nalu->nal_reference_idc = nalu->buf[0] & 0x60; // 2 bit              nalu->nal_unit_type = (nalu->buf[0]) & 0x1f;// 5 bit              free(Buf);            return pos - 1;        }        Buf[pos++] = fgetc(h264bitstream);        info3 = FindStartCode3(&Buf[pos - 4]);        if (info3 != 1)            info2 = FindStartCode2(&Buf[pos - 3]);        StartCodeFound = (info2 == 1 || info3 == 1);    }    // Here, we have found another start code (and read length of startcode bytes more than we should      // have.  Hence, go back in the file      rewind = (info3 == 1) ? -4 : -3;    if (0 != fseek(h264bitstream, rewind, SEEK_CUR)) {        free(Buf);        printf("GetAnnexbNALU: Cannot fseek in the bit stream file");    }    // Here the Start code, the complete NALU, and the next start code is in the Buf.        // The size of Buf is pos, pos+rewind are the number of bytes excluding the next      // start code, and (pos+rewind)-startcodeprefix_len is the size of the NALU excluding the start code      nalu->len = (pos + rewind) - nalu->startcodeprefix_len;    memcpy(nalu->buf, &Buf[nalu->startcodeprefix_len], nalu->len);//      nalu->forbidden_bit = nalu->buf[0] & 0x80; //1 bit      nalu->nal_reference_idc = nalu->buf[0] & 0x60; // 2 bit      nalu->nal_unit_type = (nalu->buf[0]) & 0x1f;// 5 bit      free(Buf);    return (pos + rewind);}/*** Analysis H.264 Bitstream* @param url    Location of input H.264 bitstream file.*/int simplest_h264_parser(char *url) {    NALU_t *n;    int buffersize = 100000;    //FILE *myout=fopen("output_log.txt","wb+");      FILE *myout = stdout;    h264bitstream = fopen(url, "rb+");    if (h264bitstream == NULL) {        printf("Open file error\n");        return 0;    }    n = (NALU_t*)calloc(1, sizeof(NALU_t));    if (n == NULL) {        printf("Alloc NALU Error\n");        return 0;    }    n->max_size = buffersize;    n->buf = (char*)calloc(buffersize, sizeof(char));    if (n->buf == NULL) {        free(n);        printf("AllocNALU: n->buf");        return 0;    }    int data_offset = 0;    int nal_num = 0;    printf("-----+-------- NALU Table ------+---------+\n");    printf(" NUM |    POS  |    IDC |  TYPE |   LEN   |\n");    printf("-----+---------+--------+-------+---------+\n");    while (!feof(h264bitstream))    {        int data_lenth;        data_lenth = GetAnnexbNALU(n);        char type_str[20] = { 0 };        switch (n->nal_unit_type) {        case NALU_TYPE_SLICE:sprintf(type_str, "SLICE"); break;        case NALU_TYPE_DPA:sprintf(type_str, "DPA"); break;        case NALU_TYPE_DPB:sprintf(type_str, "DPB"); break;        case NALU_TYPE_DPC:sprintf(type_str, "DPC"); break;        case NALU_TYPE_IDR:sprintf(type_str, "IDR"); break;        case NALU_TYPE_SEI:sprintf(type_str, "SEI"); break;        case NALU_TYPE_SPS:sprintf(type_str, "SPS"); break;        case NALU_TYPE_PPS:sprintf(type_str, "PPS"); break;        case NALU_TYPE_AUD:sprintf(type_str, "AUD"); break;        case NALU_TYPE_EOSEQ:sprintf(type_str, "EOSEQ"); break;        case NALU_TYPE_EOSTREAM:sprintf(type_str, "EOSTREAM"); break;        case NALU_TYPE_FILL:sprintf(type_str, "FILL"); break;        }        char idc_str[20] = { 0 };        switch (n->nal_reference_idc >> 5) {        case NALU_PRIORITY_DISPOSABLE:sprintf(idc_str, "DISPOS"); break;        case NALU_PRIRITY_LOW:sprintf(idc_str, "LOW"); break;        case NALU_PRIORITY_HIGH:sprintf(idc_str, "HIGH"); break;        case NALU_PRIORITY_HIGHEST:sprintf(idc_str, "HIGHEST"); break;        }        fprintf(myout, "%5d| %8d| %7s| %6s| %8d|\n", nal_num, data_offset, idc_str, type_str, n->len);        data_offset = data_offset + data_lenth;        nal_num++;    }    //Free      if (n) {        if (n->buf) {            free(n->buf);            n->buf = NULL;        }        free(n);    }    return 0;}int main(){    simplest_h264_parser("src01.h264");    return 0;}