Track Groups

Collaboration diagram for Track Groups:

Functions
GF_Err	gf_isom_get_track_switch_group_count (GF_ISOFile *isom_file, u32 trackNumber, u32 *alternateGroupID, u32 *nb_groups)
const u32 *	gf_isom_get_track_switch_parameter (GF_ISOFile *isom_file, u32 trackNumber, u32 group_index, u32 *switchGroupID, u32 *criteriaListSize)
GF_Err	gf_isom_set_track_switch_parameter (GF_ISOFile *isom_file, u32 trackNumber, u32 trackRefGroup, Bool is_switch_group, u32 *switchGroupID, u32 *criteriaList, u32 criteriaListCount)
GF_Err	gf_isom_reset_track_switch_parameter (GF_ISOFile *isom_file, u32 trackNumber, Bool reset_all_group)
GF_Err	gf_isom_reset_switch_parameters (GF_ISOFile *isom_file)
GF_Err	gf_isom_set_track_group (GF_ISOFile *isom_file, u32 trackNumber, u32 track_group_id, u32 group_type, Bool do_add)

Detailed Description

Function Documentation

gf_isom_get_track_switch_group_count()

GF_Err gf_isom_get_track_switch_group_count	(	GF_ISOFile *	isom_file,
		u32	trackNumber,
		u32 *	alternateGroupID,
		u32 *	nb_groups
	)

gets the number of switching groups declared in this track if any

Parameters

isom_file	the target ISO file
trackNumber	the target track
alternateGroupID	alternate group id of track if speciifed, 0 otherwise
nb_groups	set to number of switching groups defined for this track

Returns

error if any

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gf_isom_get_track_switch_parameter()

const u32* gf_isom_get_track_switch_parameter	(	GF_ISOFile *	isom_file,
		u32	trackNumber,
		u32	group_index,
		u32 *	switchGroupID,
		u32 *	criteriaListSize
	)

get the list of criteria (expressed as 4CC IDs, cf 3GPP TS 26.244)

Parameters

isom_file	the target ISO file
trackNumber	the track number
group_index	the 1-based index of the group to inspect
switchGroupID	set to the ID of the switch group if any, 0 otherwise (alternate-only group)
criteriaListSize	set to the number of criteria items in returned list

Returns

list of criteria (four character codes, cf 3GPP TS 26.244) for the switch group

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gf_isom_set_track_switch_parameter()

GF_Err gf_isom_set_track_switch_parameter	(	GF_ISOFile *	isom_file,
		u32	trackNumber,
		u32	trackRefGroup,
		Bool	is_switch_group,
		u32 *	switchGroupID,
		u32 *	criteriaList,
		u32	criteriaListCount
	)

sets a new (switch) group for this track

Parameters

isom_file	the target ISO file
trackNumber	the target track
trackRefGroup	number of a track belonging to the same alternate group. If 0, a new alternate group will be created for this track
is_switch_group	if set, indicates that a switch group identifier shall be assigned to the created group. Otherwise, the criteria list is associated with the entire alternate group
switchGroupID	set to the ID of the switch group. On input, specifies the desired switchGroupID to use; if value is 0, next available switchGroupID in file is used. On output, is set to the switchGroupID used.
criteriaList	list of four character codes used as criteria - cf 3GPP TS 26.244
criteriaListCount	number of criterias in list

Returns

error if any

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gf_isom_reset_track_switch_parameter()

GF_Err gf_isom_reset_track_switch_parameter	(	GF_ISOFile *	isom_file,
		u32	trackNumber,
		Bool	reset_all_group
	)

resets track switch group information

Parameters

isom_file	the target ISO file
trackNumber	the target track
reset_all_group	if GF_TRUE, resets the entire alternate group this track belongs to; otherwise, resets switch group for the track only

Returns

error if any

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gf_isom_reset_switch_parameters()

GF_Err gf_isom_reset_switch_parameters

(

GF_ISOFile *

isom_file

)

resets all track switch group information in the entire movie

Parameters

isom_file

the target ISO file

Returns

error if any

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gf_isom_set_track_group()

GF_Err gf_isom_set_track_group	(	GF_ISOFile *	isom_file,
		u32	trackNumber,
		u32	track_group_id,
		u32	group_type,
		Bool	do_add
	)

sets track in group of a given type and ID

Parameters

isom_file	the target ISO file
trackNumber	the target track
track_group_id	ID of the track group
group_type	four character code of the track group
do_add	if GF_FALSE, track is removed from that group, otherwise it is added

Returns

error if any

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