rtcodeprefix_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);} / ** * Analysis H.264 BitStream * @Param Url location. * / Int simplest_h264_parser (charser * 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 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; casser_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) {i (n-> buf) { Free (n-> buf); n-> buf = null;} free (n);} return 0;}
The function call method above is as follows.
SimpleSt_H264_Parser ("SINTEL.H264");
result
The input of this program is a file path of a H.264 original code stream (bare stream), which outputs NALU statistics of the code stream, as shown in the following figure.
download
SimpleSt Mediadata Test
Project homepage
SourceForge: https://sourceforge.net/projects/simplest-mediadata-test/
GitHub: https://github.com/leixiaohua1020/simplest_mediadata_test
Open source China: http://git.oschina.net/leixiaohua1020/simplest_mediadata_test
CSDN Download Download: http: //download.csdn.net/detail/leixiaohua1020/9422409
This project includes several views of audio data parsing examples: (1) pixel data handler. Contains functions of RGB and YUV pixel format processing.
(2) Audio sampling data handler. Contains functions for PCM audio sampling format processing.
(3) H.264 code stream analysis program. The NALU can be isolated and analyzed.
(4) AAC code stream analysis program. The ADTS frame can be separated and parse.
(5) FLV package format analysis program. The MP3 audio code stream in the FLV can be separated.
(6) UDP-RTP protocol analysis program. UDP / RTP / MPEG-TS packets can be analyzed.
Lei Xiaohua,
[email protected]://blog.csdn.net/leixiaohua1020
Our other product:
