structs.h

mysee网络直播源代码Mysee Lite是Mysee独立研发的网络视频流媒体播放系统。在应有了P2P技术和一系列先进流媒体技术之后

/*
 *  Openmysee
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */
// 系统通用的数据结构以及部分常量的定义
#pragma once

enum {
	TS4NP_PORT	= 53,		// TS接受NP访问的默认端口
	CP4NP_PORT	= 80,		// CP接受NP访问的默认端口
    MD5_LEN		= 32,		// MD5值的长度
	BLOCK_SIZE	= 16384,	// 默认分块大小
};

// 普通网络的IP地址信息，精简版，大小8字节
// 不能直接当做sockaddr使用，只能赋值给一个sockaddr
class NormalAddress {
public:
    NormalAddress() {
        memset(this, 0, sizeof(NormalAddress));
        sin_family = AF_INET;
    };
    bool operator == (const NormalAddress& addr) const {
        return ((addr.sin_addr.s_addr == sin_addr.s_addr) && 
            (addr.sin_port == sin_port));
    };
    short sin_family;
    u_short sin_port;
    struct in_addr sin_addr;
};

// P2P网络的Peer地址信息, 精简版，大小16字节
class P2PAddress {
public:
    BOOL IsNAT() const { return !(0xffffffff == subnetIP.sin_addr.s_addr);};
    // 外网用户的本机IP和发送段口，内网用户的出口网关IP和发送段口
    NormalAddress    outerIP;
    // 外网用户为"255.255.255.255"和监听段口，内网用户的内网IP和监听端口
    NormalAddress    subnetIP;
	// P2PAddress不需要比较外网的端口
    bool operator == (const P2PAddress& addr) const {
		return ((addr.outerIP.sin_addr.s_addr == outerIP.sin_addr.s_addr) && (addr.subnetIP == subnetIP));
    };
};

// 这是P2P网络中最需要交流的信息，将来还可能进行扩充，目前大小4字节
class CorePeerInfo {
public:
    CorePeerInfo() {memset(this, 0, sizeof(CorePeerInfo));};
    unsigned layer:8;       // 在P2P网络中位于第几层(最大256)
    unsigned isMaxIn:1;     // 是否达到最大连入的连接数
    unsigned isMaxOut:1;    // 是否达到最大连出的连接数
    unsigned isMaxFreeIn:1; // 是否达到最大连入的连接数(作贡献)
    unsigned isMaxFreeOut:1;// 是否达到最大连出的连接数(作贡献)
    unsigned isCachePeer:1; // 是CachePeer还是NormalPeer
    unsigned :19;           // 空位域，留作以后使用
};

// 加上Peer地址的PeerInfo, 目前大小20字节
class PeerInfoWithAddr : public CorePeerInfo, public P2PAddress {};

// 数据传输的相关信息，目前大小32字节
class TransferInfo {
public:
    TransferInfo() { memset(this, 0, sizeof(TransferInfo)); };
    LONGLONG totalDownBytes;  // 总共下载字节
    LONGLONG totalUpBytes;    // 总共上传字节
    float    currDownSpeed;   // 当前下载速度
    float    currUpSpeed;     // 当前上传速度
    float    avgDownSpeed;    // 平均下载速度
    float    avgUpSpeed;      // 平均上传速度
};

// DirectShow初始化需要的媒体类型数据，大小56字节
struct MediaType {
	GUID     majortype;
	GUID     subtype;
	GUID     formattype;
	ULONG    lSampleSize;
	unsigned bFixedSizeSamples:1;
	unsigned bTemporalCompression:1;
	unsigned bThisPinOnly:1;
	unsigned cbFormat:16;
	unsigned :13;
};

// Sample头的大小，共16字节
// 如果length和start都等于-1，则此Sample是节目开始的标志，不包含任何数据
// 如果length和start都等于0， 则此Sample是媒体类型数据，bAudioSample表示音频或者视频
struct SampleHeader {
	unsigned	size:28;			// 此Sample大小
	unsigned	bDiscontinuity:1;	// Sample属性
	unsigned	bPreroll:1;			// Sample属性
	unsigned	bSyncPoint:1;		// 是否关键帧
	unsigned	bAudioSample:1;		// 是否音频Sample
	UINT		length;				// 时间跨度
	LONGLONG	start;				// 起始时间
};

// SP发送的更新，要在NP之间传播, 大小24字节
class SPUpdate {
public:
	SPUpdate() : minKeySample(0x7fffffffffffffff), maxKeySample(0), 
		minBlockID(0xffffffff), maxBlockID(0){};

	LONGLONG minKeySample; // SP上最小的KeySample时间
	LONGLONG maxKeySample; // SP上最大的KeySample时间
	UINT     minBlockID;   // SP上最小的块编号
	UINT     maxBlockID;   // SP上最大的块编号
};