/*!
?*************************************************************************************
?*?\file?annexb.c
?*
?*?\brief
?*????Annex?B?Byte?Stream?format
?*
?*?\author
?*????Main?contributors?（see?contributors.h?for?copyright?address?and?affiliation?details）
?*??????-?Stephan?Wenger??????????????????
?*************************************************************************************
?*/

#include?
#include?

#include?“global.h“
#include?“annexb.h“
#include?“memalloc.h“


FILE?*bits?=?NULL;????????????????//!static?int?FindStartCode?（unsigned?char?*Buf?int?zeros_in_startcode）;


/*!
?************************************************************************
?*?\brief
?*????Returns?the?size?of?the?NALU?（bits?between?start?codes?in?case?of
?*????Annex?B.??nalu->buf?and?nalu->len?are?filled.??Other?field?in
?*????nalu->?remain?uninitialized?（will?be?taken?care?of?by?NALUtoRBSP.
?*
?*?\return
?*?????0?if?there?is?nothing?any?more?to?read?（EOF）
?*????-1?in?case?of?any?error
?*
?*??\note?Side-effect:?Returns?length?of?start-code?in?bytes.?
?*
?*?\note
?*???GetAnnexbNALU?expects?start?codes?at?byte?aligned?positions?in?the?file
?*
?************************************************************************
?*/

int?GetAnnexbNALU?（NALU_t?*nalu）
{
??int?info2?info3?pos?=?0;
??int?StartCodeFound?rewind;
??char?*Buf;
????
??if?（（Buf?=?（char*）calloc?（nalu->max_size??sizeof（char）））?==?NULL）?no_mem_exit（“GetAnnexbNALU:?Buf“）;

??nalu->startcodeprefix_len=3;

??info2?=?0;
??info3?=?0;
??
??if?（3?!=?fread?（Buf?1?3?bits））
??{
????free（Buf）;
????return?0;
??}

??info2?=?FindStartCode?（Buf?2）;
??if（info2?!=?1）?{
????if（1?!=?fread（Buf+3?1?1?bits））
????{
??????free（Buf）;
??????return?0;
????}
????info3?=?FindStartCode?（Buf?3）;
??}

??if?（info2?!=?1?&&?info3?!=?1）
??{
????printf?（“GetAnnexbNALU:?no?Start?Code?at?the?begin?of?the?NALU?return?-1\n“）;
????free（Buf）;
????return?-1;
??}

??if（?info2?==?1）?{
????nalu->startcodeprefix_len?=?3;
????pos?=?3;
??}
??else?if（info3?==1?）?{
????pos?=?4;
????nalu->startcodeprefix_len?=?4;
??}
??else
????printf（?“?Panic:?Error?\n“）;

??StartCodeFound?=?0;
??info2?=?0;
??info3?=?0;

??while?（!StartCodeFound）
??{
????if?（feof?（bits））
????{
??????nalu->len?=?（pos-1）-nalu->startcodeprefix_len;
??????memcpy?（nalu->buf?&Buf[nalu->startcodeprefix_len]?nalu->len）;?????
??????nalu->forbidden_bit?=?（nalu->buf[0]>>7）?&?1;
??????nalu->nal_reference_idc?=?（nalu->buf[0]>>5）?&?3;
??????nalu->nal_unit_type?=?（nalu->buf[0]）?&?0x1f;

//?printf?（“GetAnnexbNALU?eof?case:?pos?%d?nalu->len?%d?nalu->reference_idc?%d?nal_unit_type?%d?\n“?pos?nalu->len?nalu->nal_reference_idc?nalu->nal_unit_type）;

#if?TRACE
??fprintf?（p_trace?“\n\nLast?NALU?in?File\n\n“）;
??fprintf?（p_trace?“Annex?B?NALU?w/?%s?startcode?len?%d?forbidden_bit?%d?nal_reference_idc?%d?nal_unit_

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2012-02-04?18:00??h264_JM源碼\
?????目錄???????????0??2012-02-04?18:00??h264_JM源碼\JM83\
?????文件???????28707??2004-07-26?16:04??h264_JM源碼\JM83\CHANGES.TXT
?????文件????????5002??2004-07-26?16:04??h264_JM源碼\JM83\Changes_detail.txt
?????文件????????3403??2004-07-26?16:04??h264_JM源碼\JM83\Readme.txt
?????目錄???????????0??2012-02-04?18:00??h264_JM源碼\JM83\bin\
?????文件????????1120??2004-08-20?10:58??h264_JM源碼\JM83\bin\dataDec.txt
?????文件?????????753??2004-07-26?16:03??h264_JM源碼\JM83\bin\decoder.cfg
?????文件???????11226??2004-07-26?16:03??h264_JM源碼\JM83\bin\encoder_baseline.cfg
?????文件???????11226??2004-07-26?16:03??h264_JM源碼\JM83\bin\encoder_extended.cfg
?????文件???????11226??2004-07-26?16:03??h264_JM源碼\JM83\bin\encoder_main.cfg
?????文件??????114048??2004-07-26?16:03??h264_JM源碼\JM83\bin\foreman_part_qcif.yuv
?????文件??????421888??2004-08-20?10:53??h264_JM源碼\JM83\bin\ldecod._xe
?????文件??????409666??2004-08-20?10:43??h264_JM源碼\JM83\bin\ldecod.exe
?????文件??????131425??2004-08-20?10:43??h264_JM源碼\JM83\bin\ldecod.map
?????文件???????14908??2004-08-20?10:53??h264_JM源碼\JM83\bin\ldecod.pbi
?????文件???????14976??2004-08-20?10:58??h264_JM源碼\JM83\bin\ldecod.pbo
?????文件???????22312??2004-08-20?10:58??h264_JM源碼\JM83\bin\ldecod.pbt
?????文件??????697344??2004-08-20?10:43??h264_JM源碼\JM83\bin\ldecod.pdb
?????文件??????????16??2004-07-26?16:03??h264_JM源碼\JM83\bin\leakybucketrate.cfg
?????文件??????618562??2004-07-26?17:05??h264_JM源碼\JM83\bin\lencod.exe
?????文件??????245248??2004-07-26?17:05??h264_JM源碼\JM83\bin\lencod.map
?????文件??????992256??2004-07-26?17:05??h264_JM源碼\JM83\bin\lencod.pdb
?????文件????????1686??2004-08-20?10:58??h264_JM源碼\JM83\bin\log.dec
?????文件??????????66??2004-07-26?16:03??h264_JM源碼\JM83\bin\sg0conf.cfg
?????文件?????????126??2004-07-26?16:03??h264_JM源碼\JM83\bin\sg2conf.cfg
?????文件????????1188??2004-07-26?16:03??h264_JM源碼\JM83\bin\sg6conf.cfg
?????文件???????58302??2004-08-01?20:31??h264_JM源碼\JM83\bin\test.264
?????文件?????7679232??2004-08-20?10:58??h264_JM源碼\JM83\bin\test_dec.yuv
?????文件????????1383??2004-07-26?16:04??h264_JM源碼\JM83\copyright.txt
?????文件???????16175??2004-08-20?15:23??h264_JM源碼\JM83\data.txt
............此處省略1178個文件信息