Media Hinting

ISOBMFF file hinting. More...

Collaboration diagram for Media Hinting:

Enumerations
enum	GF_SDP_IODProfile { GF_SDP_IOD_NONE = 0 , GF_SDP_IOD_REGULAR , GF_SDP_IOD_ISMA , GF_SDP_IOD_ISMA_STRICT }

Functions
GF_RTPHinter *	gf_hinter_track_new (GF_ISOFile *isom_file, u32 trackNumber, u32 Path_MTU, u32 max_ptime, u32 default_rtp_rate, u32 hint_flags, u8 PayloadID, Bool copy_media, u32 InterleaveGroupID, u8 InterleaveGroupPriority, GF_Err *e)
void	gf_hinter_track_del (GF_RTPHinter *tkHinter)
GF_Err	gf_hinter_track_process (GF_RTPHinter *tkHinter)
u32	gf_hinter_track_get_bandwidth (GF_RTPHinter *tkHinter)
GF_Err	gf_hinter_track_force_no_offsets (GF_RTPHinter *tkHinter)
u32	gf_hinter_track_get_flags (GF_RTPHinter *tkHinter)
void	gf_hinter_track_get_payload_name (GF_RTPHinter *tkHinter, char *payloadName)
GF_Err	gf_hinter_track_finalize (GF_RTPHinter *tkHinter, Bool AddSystemInfo)
GF_Err	gf_hinter_finalize (GF_ISOFile *isom_file, GF_SDP_IODProfile IOD_Profile, u32 bandwidth)
Bool	gf_hinter_can_embbed_data (u8 *data, u32 data_size, u32 streamType)

Detailed Description

ISOBMFF file hinting.

This section documents functions for ISOBMFF file hinting.

Enumeration Type Documentation

GF_SDP_IODProfile

enum GF_SDP_IODProfile

SDP IOD Profile

Enumerator
GF_SDP_IOD_NONE	no IOD included
GF_SDP_IOD_REGULAR	base64 encoding of the regular MPEG-4 IOD
GF_SDP_IOD_ISMA	base64 encoding of IOD containing BIFS and OD tracks (one AU only) - this is used for ISMA 1.0 profiles note that the "hinted" file will loose all systems info
GF_SDP_IOD_ISMA_STRICT	same as ISMA but removes all clock references from IOD

Function Documentation

gf_hinter_track_new()

GF_RTPHinter * gf_hinter_track_new	(	GF_ISOFile *	isom_file,
		u32	trackNumber,
		u32	Path_MTU,
		u32	max_ptime,
		u32	default_rtp_rate,
		u32	hint_flags,
		u8	PayloadID,
		Bool	copy_media,
		u32	InterleaveGroupID,
		u8	InterleaveGroupPriority,
		GF_Err *	e
	)

Creates a new track hinter object

Parameters

isom_file	the target ISOBMF file
trackNumber	the track to hint
Path_MTU	max RTP packet size (excluding IP/UDP/IP headers)
max_ptime	max packet duration in RTP timescale, can be set to 0 for auto compute
default_rtp_rate	RTP rate for the track, can be set to 0 for auto compute
hint_flags	RTP flags as defined in <gpac/ietf.h>
PayloadID	RTP payload ID, can be set to 0 for auto compute
copy_media	if set, media is copied inside the hint samples, otherwise only referenced from the media track
InterleaveGroupID	sets the group ID of this track for interleaving - same semantics as in gf_isom_set_track_interleaving_group
InterleaveGroupPriority	sets the group priority of this track for interleaving - same semantics as in gf_isom_set_track_priority_in_group
e	output error code if any

Returns

the hinter object

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gf_hinter_track_del()

void gf_hinter_track_del

(

GF_RTPHinter *

tkHinter

)

Delete the track hinter

Parameters

tkHinter

track hinter object

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gf_hinter_track_process()

GF_Err gf_hinter_track_process

(

GF_RTPHinter *

tkHinter

)

hints all samples in the media track

Parameters

tkHinter

track hinter object

Returns

error if any

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gf_hinter_track_get_bandwidth()

u32 gf_hinter_track_get_bandwidth

(

GF_RTPHinter *

tkHinter

)

Gets media bandwidth in kbps

Parameters

tkHinter

track hinter object

Returns

media bandwidth in kbps

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gf_hinter_track_force_no_offsets()

GF_Err gf_hinter_track_force_no_offsets

(

GF_RTPHinter *

tkHinter

)

Force file to use no random offsets for sequence number and time, if supported by server

Parameters

tkHinter

track hinter object

Returns

error if any

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gf_hinter_track_get_flags()

u32 gf_hinter_track_get_flags

(

GF_RTPHinter *

tkHinter

)

Gets track hinter flags

Parameters

tkHinter

track hinter object

Returns

hint flags for this object

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gf_hinter_track_get_payload_name()

void gf_hinter_track_get_payload_name	(	GF_RTPHinter *	tkHinter,
		char *	payloadName
	)

Gets rtp payload name

Parameters

tkHinter	track hinter object
payloadName	static buffer for retrieval, minimum 30 bytes

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gf_hinter_track_finalize()

GF_Err gf_hinter_track_finalize	(	GF_RTPHinter *	tkHinter,
		Bool	AddSystemInfo
	)

Finalizes hinting process for the track (setup flags, write SDP for RTP, ...)

Parameters

tkHinter	track hinter object
AddSystemInfo	if true, systems info are duplicated in the SDP (decoder cfg, PL IDs ..)

Returns

error if any

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gf_hinter_finalize()

GF_Err gf_hinter_finalize	(	GF_ISOFile *	isom_file,
		GF_SDP_IODProfile	IOD_Profile,
		u32	bandwidth
	)

Finalizes hinting process for the file (setup flags, write SDP for RTP, ...)

Parameters

isom_file	target ISOBMF file
IOD_Profile	the IOD profile to use for SDP
bandwidth	total bandwidth in kbps of all hinted tracks, 0 means no bandwidth info at session level

Returns

error if any

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gf_hinter_can_embbed_data()

Bool gf_hinter_can_embbed_data	(	u8 *	data,
		u32	data_size,
		u32	streamType
	)

Check if the given data fits in an ESD url

Parameters

data	data to be encoded
data_size	size of data to be encoded
streamType	systems stream type needed to signal data mime-type (OD, BIFS or any)

Returns

GF_TRUE if the encoded data fits in an ESD url

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