typedef enum tagFrameSize
{
	FORBIDDEN=0,
	SQCIF=1,
	QCIF=2,
	CIF=3,
	fCIF=4,
	ssCIF=5

}FrameSize;

// MSH26X Configuration Information
typedef struct tagMSH26XCONF{
	BOOL	bInitialized;               // Whether custom msgs can be rcv'd.
	BOOL	bCompressBegin;				// Whether the CompressBegin msg was rcv'd.
	BOOL	bRTPHeader;                 // Whether to generate RTP header info
	/* used if bRTPHeader */
	UINT	unPacketSize;               // Maximum packet size
	BOOL	bEncoderResiliency;         // Whether to use resiliency restrictions
	/* used if bEncoderResiliency */
	UINT	unPacketLoss;
	BOOL	bBitRateState;
	/* used if bBitRateState */
	UINT	unBytesPerSecond;
	/* The following information is determined from the packet loss value.   */
	/*  These values are calculated each time we receive a resiliency msg or */
	/*  the value is changed through the dialog box.  They are not stored in */
	/*  the registry.  Only the above elements are stored in the registry.   */
	BOOL	bDisallowPosVerMVs;   		// if true, disallow positive vertical MVs
	BOOL	bDisallowAllVerMVs;   		// if true, disallow all vertical MVs
	UINT	unPercentForcedUpdate;      // Percent Forced Update per Frame
	UINT	unDefaultIntraQuant;        // Default Intra Quant
	UINT	unDefaultInterQuant;        // Default Inter Quant
} MSH26XCONF;

// MSH26X Compressor Instance information
typedef struct tagMSH26XCOMPINSTINFO{
	BOOL		Initialized;
	WORD		xres, yres;
	FrameSize	FrameSz;		// Which of the supported frame sizes.
	float		FrameRate;
	DWORD		DataRate;		// Data rate in bytes per second.
	HGLOBAL		hEncoderInst;   // Instance data private to encoder.
	LPVOID		EncoderInst;
	WORD		CompressedSize;
	BOOL		Is160x120;
	BOOL		Is240x180;
	BOOL		Is320x240;
	MSH26XCONF	Configuration;
#if !defined(_ALPHA_) && defined(USE_BILINEAR_MSH26X)
	UINT		InputCompression;
	UINT		InputBitWidth;
#endif
} MSH26XCOMPINSTINFO, *PMSH26XCOMPINSTINFO;

// MSH26X BitStream Info Trailer structure
typedef struct tagH26X_RTP_BSINFO_TRAILER {
	DWORD dwVersion;
	DWORD dwFlags;
	DWORD dwUniqueCode;
	DWORD dwCompressedSize;
	DWORD dwNumOfPackets;
	BYTE  bySrc;
	BYTE  byTR;
	BYTE  byTRB;
	BYTE  byDBQ;
} H26X_RTP_BSINFO_TRAILER, *PH26X_RTP_BSINFO_TRAILER;

// MSH263 BitStream Info structure
typedef struct tagRTP_H263_BSINFO {
	DWORD dwFlags;
	DWORD dwBitOffset;
	BYTE  byMode;
	BYTE  byMBA;
	BYTE  byQuant;
	BYTE  byGOBN;
	char  cHMV1;
	char  cVMV1;
	char  cHMV2;
	char  cVMV2;
} RTP_H263_BSINFO, *PRTP_H263_BSINFO;

// MSH261 BitStream Info structure
typedef struct tagRTP_H261_BSINFO {
	DWORD dwFlags;
	DWORD dwBitOffset;
	BYTE  byMBA;
	BYTE  byQuant;
	BYTE  byGOBN;
	char  cHMV;
	char  cVMV;
	BYTE  byPadding0;
	WORD  wPadding1;
} RTP_H261_BSINFO, *PRTP_H261_BSINFO;

// Constants
#define H263_RTP_BS_START_CODE		MakeFOURCC('H','2','6','3')
#define H261_RTP_BS_START_CODE		MakeFOURCC('H','2','6','1')
#define RTP_H26X_INTRA_CODED		0x00000001
#define RTP_H263_PB					0x00000002
#define RTP_H263_AP					0x00000004
#define RTP_H263_SAC				0x00000008
#define RTP_H263_MODE_A				0x00
#define RTP_H263_MODE_B				0x01
#define RTP_H263_MODE_C				0x02
#define H26X_RTP_PAYLOAD_VERSION    0x00000000
#define RTP_H26X_PACKET_LOST		0x00000001