sync_layer.h File Reference

MPEG-4 Object Descriptor Framework Sync Layer. More...

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Data Structures
struct	GF_SLConfig
	MPEG-4 Object Descriptor Framework Sync Layer. More...
struct	GF_SLHeader
enum	{ SLPredef_Null = 0x01 , SLPredef_MP4 = 0x02 }
GF_Err	gf_odf_slc_set_pref (GF_SLConfig *sl)
void	gf_sl_packetize (GF_SLConfig *slConfig, GF_SLHeader *Header, u8 *PDU, u32 size, u8 **outPacket, u32 *OutSize)
u32	gf_sl_get_header_size (GF_SLConfig *slConfig, GF_SLHeader *Header)
void	gf_sl_depacketize (GF_SLConfig *slConfig, GF_SLHeader *Header, const u8 *PDU, u32 PDULength, u32 *HeaderLen)

Detailed Description

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Data Structure Documentation

GF_SLHeader

struct GF_SLHeader

MPEG-4 sync layer header information

Data Fields
u8	accessUnitStartFlag
u8	accessUnitEndFlag
u8	paddingFlag
u8	randomAccessPointFlag
u8	OCRflag
u8	idleFlag
u8	decodingTimeStampFlag
u8	compositionTimeStampFlag
u8	instantBitrateFlag
u8	degradationPriorityFlag
u8	paddingBits
u16	packetSequenceNumber
u64	objectClockReference
u16	AU_sequenceNumber
u64	decodingTimeStamp
u64	compositionTimeStamp
u16	accessUnitLength
u32	instantBitrate
u16	degradationPriority
u32	au_duration
u8	isma_encrypted
u64	isma_BSO
u8	cenc_encrypted
u8	IV_size
u32	crypt_byte_block
u32	skip_byte_block
u8	constant_IV_size
bin128	constant_IV
u8	m2ts_version_number_plus_one
u8	m2ts_pcr
s64	timeStampOffset
u64	sender_ntp
u8	seekFlag
u32	samplerate
u32	channels

Enumeration Type Documentation

anonymous enum

anonymous enum

SL config predefined values

Enumerator
SLPredef_Null
SLPredef_MP4

Function Documentation

gf_odf_slc_set_pref()

GF_Err gf_odf_slc_set_pref

(

GF_SLConfig *

sl

)

sets SL predefined (assign all fields according to sl->predefined value)

Parameters

sl	the target SL config descriptor

Returns

error if any

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gf_sl_packetize()

void gf_sl_packetize	(	GF_SLConfig *	slConfig,
		GF_SLHeader *	Header,
		u8 *	PDU,
		u32	size,
		u8 **	outPacket,
		u32 *	OutSize
	)

packetizes SL-PDU. If PDU is NULL or size 0, only writes the SL header

Parameters

slConfig	the target SL config descriptor
Header	the SL header for this data block
PDU	the payload to packetize
size	the payload size
outPacket	set to an allocated buffer containing the serialized SL packet - to be destroyed by caller
OutSize	set to the size of the serialized SL packer

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gf_sl_get_header_size()

u32 gf_sl_get_header_size	(	GF_SLConfig *	slConfig,
		GF_SLHeader *	Header
	)

gets SL header size

Parameters

slConfig	the target SL config descriptor
Header	the SL header for this data block

Returns

the size of the SL header in bytes

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gf_sl_depacketize()

void gf_sl_depacketize	(	GF_SLConfig *	slConfig,
		GF_SLHeader *	Header,
		const u8 *	PDU,
		u32	PDULength,
		u32 *	HeaderLen
	)

depacketizes SL-PDU

Parameters

slConfig	the target SL config descriptor
Header	filled with the decoded SL header
PDU	the SL packet to parse
PDULength	the size of the SL packet
HeaderLen	set to size of the SL header - payload will start at PDU + *HeaderLen

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