//?NALDecoder.cpp?:?Defines?the?entry?point?for?the?console?application.

#include?
#include?
#include?
#include?
#include?“h264.h“
#include?“initsock.h“

CInitSock?initSock;		//?初始化Winsock庫

//為NALU_t結構體分配內存空間

NALU_t?*AllocNALU（int?buffersize）
{
	NALU_t?*pNalu;
	if?（（pNalu?=?（NALU_t*）calloc?（1?sizeof?（NALU_t）））?==?NULL）	{
		printf（“AllocNALU:?Nalu“）;
		exit（0）;
	}

	pNalu->max_size=buffersize;
	if?（（pNalu->buf?=?（char*）calloc?（buffersize?sizeof?（char）））?==?NULL）	{
		free?（pNalu）;
		printf?（“AllocNALU:?Nalu->buf“）;
		exit（0）;
	}
	return?pNalu;
}

//釋放
void?FreeNALU（NALU_t?*pNalu）
{
	if?（pNalu）	{
		if?（pNalu->buf）	{
			free（pNalu->buf）;
			pNalu->buf=NULL;
		}
		free?（pNalu）;
	}
}

static?int?FindStartCode2?（unsigned?char?*Buf）
{
	if（Buf[0]!=0?||?Buf[1]!=0?||?Buf[2]?!=1）?return?0;?//判斷是否為0x000001如果是返回1
	else?return?1;
}

static?int?FindStartCode3?（unsigned?char?*Buf）
{
	if（Buf[0]!=0?||?Buf[1]!=0?||?Buf[2]?!=0?||?Buf[3]?!=1）?return?0;//判斷是否為0x00000001如果是返回1
	else?return?1;
}

//?這個函數輸入為一個NAL結構體，主要功能為得到一個完整的NALU并保存在NALU_t的buf中，獲取他的長度，填充FIDCTYPE位。
//?并且返回兩個開始字符之間間隔的字節數，即包含有前綴的NALU的長度
int?GetAnnexbNALU?（NALU_t?*pNalu?FILE?*bits）
{
	int?info2=0?info3=0;
	int?pos?=?0;
	int?StartCodeFound?rewind;
	unsigned?char?*Buf;

	if?（（Buf?=?（unsigned?char*）calloc?（pNalu->max_size??sizeof（char）））?==?NULL）?
		printf?（“GetAnnexbNALU:?Could?not?allocate?Buf?memory\n“）;
		
	if?（3?!=?fread?（Buf?1?3?bits））?{		//從碼流中讀3個字節
		free（Buf）;
		return?-1;
????}
	if?（Buf[0]!=0?||?Buf[1]!=0）?{
		free（Buf）;
		return?-1;
	}
	if?（Buf[2]==1）?{
		pNalu->startcodeprefix_len=3;???//初始化碼流序列的開始字符為3個字節
		pos?=3;
	}else?{
		if?（1?!=?fread?（Buf+3?1?1?bits））?{		//從碼流中讀1個字節
			free（Buf）;
			return?-1;
		}
		if?（Buf[2]!=0?||?Buf[3]!=1）?{
			free（Buf）;
			return?-1;
		}
		pos?=?4;
		pNalu->startcodeprefix_len?=?4;
	}

	//查找下一個開始字符的標志位
	StartCodeFound?=?0;
	info2?=?0;
	info3?=?0;
????while?（!StartCodeFound）??{
		if?（feof?（bits））?{	//判斷是否到了文件尾
			break;
		}
		Buf[pos++]?=?fgetc?（bits）;//讀一個字節到BUF中
		info3?=?FindStartCode3（&Buf[pos-4]）;//判斷是否為0x00000001
		if（info3?!=?1）
			info2?=?FindStartCode2（&Buf[pos-3]）;//判斷是否為0x000001
		StartCodeFound?=（info2|info3）;
	}
	if?（StartCodeFound）?{
		//?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?（bits?rewind?SEEK_CUR））?{?//?把文件指針指向前一個NALU的末尾
			free（Buf）;
			printf（“GetAnnexbNALU:?Cannot?fseek?in?the?bit?stream?file“）;
		}
	
	}?else?{
		rewind?=?-1;
	}

	//?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
	pNalu->len?=?（pos+rewind）-pNalu->sta

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????2163??2010-12-29?08:26??NALDecoder\h264.h

?????文件????????461??2010-12-27?12:19??NALDecoder\initsock.h

?????文件??????10206??2010-12-29?08:26??NALDecoder\NALDecoder.cpp

?????文件???????4670??2010-12-27?09:54??NALDecoder\NALDecoder.dsp

?????文件????????543??2008-07-01?09:37??NALDecoder\NALDecoder.dsw

?????文件?????208963??2010-12-29?08:26??NALDecoder\NALDecoder.exe

?????文件??????50176??2010-12-29?08:26??NALDecoder\NALDecoder.ncb

?????文件??????50688??2010-12-29?08:26??NALDecoder\NALDecoder.opt

?????文件???????1267??2010-12-29?08:26??NALDecoder\NALDecoder.plg

?????文件???????1232??2008-07-01?09:37??NALDecoder\ReadMe.txt

?????文件??????93550??2006-07-25?17:57??NALDecoder\test.264

?????文件?????243860??2009-12-04?21:22??NALDecoder\test22.264

?????文件?????????82??2010-12-28?10:18??NALDecoder\w.sdp

?????目錄??????????0??2010-12-29?08:27??NALDecoder

?????文件????????599??2014-06-12?15:20??readme.txt

?????文件??????15872??2014-06-12?15:25??H264RTP打包方法.doc

-----------?---------??----------?-----??----

???????????????684332????????????????????16