asf.h.svn-base

来自「这是和p2p相关的一份源码」· SVN-BASE 代码 · 共 164 行

#ifndef _ASF_H
#define _ASF_H


#include "stream.h"

// -----------------------------------
class MSID
{
public:

	void read(Stream &in)
	{
		data1 = in.readLong();
		data2 = in.readShort();
		data3 = in.readShort();
		in.read(data4,8);
	}

	void write(Stream &out)
	{
		out.writeLong(data1);
		out.writeShort(data2);
		out.writeShort(data3);
		out.write(data4,8);
	}
	
	
	void toString(String &s)
	{
		sprintf(s.data,"%X-%X-%X-%02X%02X%02X%02X%02X%02X%02X%02X",
			data1,data2,data3,
			data4[0],data4[1],data4[2],data4[3],
			data4[4],data4[5],data4[6],data4[7]);
	}

    int operator==(const MSID& msid) const{return !memcmp(this, &msid, sizeof(MSID));}

	unsigned int data1;
	unsigned short data2,data3;
	unsigned char data4[8];

};




// -----------------------------------
const MSID headObjID=
	{0x75B22630, 0x668E, 0x11CF, 0xA6,0xD9,0x00,0xAA,0x00,0x62,0xCE,0x6C};
const MSID dataObjID=
	{0x75B22636, 0x668E, 0x11CF, 0xA6,0xD9,0x00,0xAA,0x00,0x62,0xCE,0x6C};
const MSID filePropObjID=
	{0x8CABDCA1, 0xA947, 0x11CF, 0x8E,0xE4,0x00,0xC0,0x0C,0x20,0x53,0x65};
const MSID streamPropObjID=
	{0xB7DC0791, 0xA9B7, 0x11CF, 0x8E,0xE6,0x00,0xC0,0x0C,0x20,0x53,0x65};


// -----------------------------------
class ASFObject
{
public:

	enum TYPE
	{
		T_UNKNOWN,
		T_HEAD_OBJECT,
		T_DATA_OBJECT,
		T_FILE_PROP,
		T_STREAM_PROP
	};

	int getTotalLen()
	{
		return 24+dataLen;
	}

	unsigned int readHead(Stream &in)
	{
		id.read(in);

		lenLo = in.readLong();
		lenHi = in.readLong();

		type = T_UNKNOWN;
		if (id == headObjID)
			type = T_HEAD_OBJECT;
		else if (id == dataObjID)
			type = T_DATA_OBJECT;
		else if (id == filePropObjID)
			type = T_FILE_PROP;
		else if (id == streamPropObjID)
			type = T_STREAM_PROP;

		String str;
		id.toString(str);
		LOG("ASF: %s (%s)= %d : %d\n",str.data,getTypeName(),lenLo,lenHi);


		dataLen = 0;

		return lenLo-24;
	}

	void readData(Stream &in,int len)
	{
		dataLen = len;

		if ((dataLen > sizeof(data)) || (lenHi)) 
			throw StreamException("ASF object too big");

		in.read(data,dataLen);
	}


	void write(Stream &out)
	{
		id.write(out);
		out.writeLong(lenLo);
		out.writeLong(lenHi);
		if (dataLen)
			out.write(data,dataLen);
	}

	const char *getTypeName()
	{
		switch(type)
		{
			case T_HEAD_OBJECT:
				return "ASF_Header_Object";
			case T_DATA_OBJECT:
				return "ASF_Data_Object";
			case T_FILE_PROP:
				return "ASF_File_Properties_Object";
			case T_STREAM_PROP:
				return "ASF_Stream_Properties_Object";
			default:
				return "Unknown_Object";
		}
	}

	char data[8192];
	MSID	id;
	unsigned int lenLo,lenHi,dataLen;
	TYPE type;
};
// -----------------------------------
class ASFStream
{
public:
	ASFStream()
	{
		numPackets = 0;
		packetSize = 0;
		bitrate = 0;
		flags = 0;
	}

	unsigned int packetSize,bitrate,numPackets,flags;
};



#endif