Transport Stream Packet Access

Data Structures
struct	TSPacket_t
	Structure representing an MPEG2 Transport Stream packet with out hamming codes. More...
Defines
#define	TSPACKET_SIZE   (188)
	Constant for the size of a transport packet with out hamming code.
#define	TSPACKET_GETPID(packet)   (((((packet).header[1] & 0x1f) << 8) | ((packet).header[2] & 0xff)))
	Retrieves the PID of packet from the packet header.
#define	TSPACKET_SETPID(packet, pid)
	Sets the PID of the packet in the packet header.
#define	TSPACKET_GETCOUNT(packet)   ((packet).header[3] & 0x0f)
	Retrieves the packet sequence count.
#define	TSPACKET_SETCOUNT(packet, count)   ((packet).header[3] = ((packet).header[3] & 0xf0) | ((count) & 0x0f))
	Sets the packet sequence count.
#define	TSPACKET_ISPAYLOADUNITSTART(packet)   (((packet).header[1] & 0x40) == 0x40)
	Boolean test to determine whether this packet is the start of a payload.
#define	TSPACKET_ISVALID(packet)   (((packet).header[1] & 0x80) == 0x00)
	Boolean test to determine whether this packet is valid, transport_error_indicator is not set.
#define	TSPACKET_GETPRIORITY(packet)   (((packet).header[1] & 0x20) >> 4)
	Retrieves the priority field of the packet.
#define	TSPACKET_SETPRIORITY(packet, priority)   ((packet).header[1] = ((packet).header[1] & 0xdf) | (((priority) << 4) & 0x20))
	Set the priority field of the packet.
#define	TSPACKET_GETADAPTATION(packet)   (((packet).header[3] & 0x30) >> 4)
	Retrieve whether the packet has an adaptation field.
#define	TSPACKET_SETADAPTATION(packet, adaptation)   ((packet).header[3] = ((packet).header[3] & 0xcf) | (((adaptation) << 4) & 0x30))
	Set whether the packet has an adaptation field.
#define	TSPACKET_GETADAPTATION_LEN(packet)   ((packet).payload[0])
	Retrieves the adaptation field length.

---

Define Documentation

#define TSPACKET_GETADAPTATION

(

packet

)

(((packet).header[3] & 0x30) >> 4)

Retrieve whether the packet has an adaptation field.

Parameters:

packet

The packet to check.

Returns:

The adapatation field control flags.

#define TSPACKET_GETADAPTATION_LEN

(

packet

)

((packet).payload[0])

Retrieves the adaptation field length.

Parameters:

packet

The packet to check.

Returns:

The length of the adaptation field.

#define TSPACKET_GETCOUNT

(

packet

)

((packet).header[3] & 0x0f)

Retrieves the packet sequence count.

Parameters:

packet

The packet to extract the count from.

Returns:

The packet sequence count as a 4 bit integer.

#define TSPACKET_GETPID

(

packet

)

(((((packet).header[1] & 0x1f) << 8) | ((packet).header[2] & 0xff)))

Retrieves the PID of packet from the packet header.

Parameters:

packet

The packet to extract the PID from.

Returns:

The PID of the packet as a 16bit integer.

#define TSPACKET_GETPRIORITY

(

packet

)

(((packet).header[1] & 0x20) >> 4)

Retrieves the priority field of the packet.

Parameters:

packet

The packet to check.

Returns:

The packet priority.

#define TSPACKET_ISPAYLOADUNITSTART

(

packet

)

(((packet).header[1] & 0x40) == 0x40)

Boolean test to determine whether this packet is the start of a payload.

Parameters:

packet

The packet to check.

#define TSPACKET_ISVALID

(

packet

)

(((packet).header[1] & 0x80) == 0x00)

Boolean test to determine whether this packet is valid, transport_error_indicator is not set.

Parameters:

packet

The packet to check.

Returns:

True if the packet is valid, false otherwise.

#define TSPACKET_SETADAPTATION	(	packet,
		adaptation		)	((packet).header[3] = ((packet).header[3] & 0xcf) | (((adaptation) << 4) & 0x30))

Set whether the packet has an adaptation field.

Parameters:

	packet	The packet to update.
	adaptation	The new adaptation field flags.

#define TSPACKET_SETCOUNT	(	packet,
		count		)	((packet).header[3] = ((packet).header[3] & 0xf0) | ((count) & 0x0f))

Sets the packet sequence count.

Parameters:

	packet	The packet to update.
	count	The new sequence count to set.

#define TSPACKET_SETPID	(	packet,
		pid		)

Value:

do{ \
        (packet).header[1] = ((packet).header[1] & 0xe0) | ((pid >> 8) & 0x1f); \
        (packet).header[2] = pid & 0xff; \
    }while(0)

Sets the PID of the packet in the packet header.

Parameters:

	packet	The packet to update.
	pid	The new PID to set.

#define TSPACKET_SETPRIORITY	(	packet,
		priority		)	((packet).header[1] = ((packet).header[1] & 0xdf) | (((priority) << 4) & 0x20))

Set the priority field of the packet.

Parameters:

	packet	The packet to update.
	priority	Either 1 or 0 to indicate that this is a priority packet.