AVC and HEVC ISOBMFF tools

Manipulation AVC and HEVC tracks in ISOBMFF. More...

Collaboration diagram for AVC and HEVC ISOBMFF tools:

Enumerations
enum	GF_LHVCExtractoreMode { GF_LHVC_EXTRACTORS_ON , GF_LHVC_EXTRACTORS_OFF , GF_LHVC_EXTRACTORS_OFF_FORCE_INBAND }

Functions
GF_Err	gf_media_change_pl (GF_ISOFile *isom_file, u32 trackNumber, u32 profile, u32 compat, u32 level)
	GPAC_DISABLE_AV_PARSERS. More...
GF_Err	gf_media_nal_rewrite_samples (GF_ISOFile *isom_file, u32 trackNumber, u32 new_size_in_bits)
GF_Err	gf_media_split_svc (GF_ISOFile *isom_file, u32 trackNumber, Bool splitAll)
GF_Err	gf_media_merge_svc (GF_ISOFile *isom_file, u32 trackNumber, Bool mergeAll)
GF_Err	gf_media_split_lhvc (GF_ISOFile *isom_file, u32 trackNumber, Bool for_temporal_sublayers, Bool splitAll, GF_LHVCExtractoreMode extractor_mode)
GF_Err	gf_media_split_hevc_tiles (GF_ISOFile *isom_file, u32 signal_only)
GF_Err	gf_media_filter_hevc (GF_ISOFile *isom_file, u32 trackNumber, u8 max_temporal_id_plus_one, u8 max_layer_id_plus_one)

Detailed Description

This section documents functions for manipulating AVC and HEVC tracks in ISOBMFF.

Enumeration Type Documentation

GF_LHVCExtractoreMode

enum GF_LHVCExtractoreMode

LHVC extractor mode

Enumerator
GF_LHVC_EXTRACTORS_ON	use extractors
GF_LHVC_EXTRACTORS_OFF	don't use extractors and keep base track inband/outofband param set signaling
GF_LHVC_EXTRACTORS_OFF_FORCE_INBAND	don't use extractors and force inband signaling in enhancement layer

Function Documentation

gf_media_change_pl()

GF_Err gf_media_change_pl	(	GF_ISOFile *	isom_file,
		u32	trackNumber,
		u32	profile,
		u32	compat,
		u32	level
	)

Changes the profile (if not 0) and level (if not 0) indication of the media - only AVC/H264 supported for now

Parameters

isom_file	the target ISOBMF file
trackNumber	the target track
profile	the new profile to set
compat	profile compatibility flag for H264
level	the new level to set

Returns

error if any

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gf_media_nal_rewrite_samples()

GF_Err gf_media_nal_rewrite_samples	(	GF_ISOFile *	isom_file,
		u32	trackNumber,
		u32	new_size_in_bits
	)

Rewrite NAL-based samples (AVC/HEVC/...) samples if nalu size_length has to be changed

Parameters

isom_file	the target ISOBMF file
trackNumber	the target track
new_size_in_bits	new size in bits of the NALU length field in the track, for all samples description of the track

Returns

error if any

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gf_media_split_svc()

GF_Err gf_media_split_svc	(	GF_ISOFile *	isom_file,
		u32	trackNumber,
		Bool	splitAll
	)

Split SVC layers

Parameters

isom_file	the target ISOBMF file
trackNumber	the target track
splitAll	if set each layers will be in a single track, otherwise all non-base layers will be in the same track

Returns

error if any

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gf_media_merge_svc()

GF_Err gf_media_merge_svc	(	GF_ISOFile *	isom_file,
		u32	trackNumber,
		Bool	mergeAll
	)

Merge SVC layers

Parameters

isom_file	the target ISOBMF file
trackNumber	the target track
mergeAll	if set all layers will be merged a single track, otherwise all non-base layers will be merged in the same track

Returns

error if any

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gf_media_split_lhvc()

GF_Err gf_media_split_lhvc	(	GF_ISOFile *	isom_file,
		u32	trackNumber,
		Bool	for_temporal_sublayers,
		Bool	splitAll,
		GF_LHVCExtractoreMode	extractor_mode
	)

Split L-HEVC layers

Parameters

isom_file	the target ISOBMF file
trackNumber	the target track
for_temporal_sublayers	if set only temporal sublayers are split, otherwise layers are split
splitAll	if set each layers will be in a single track, otherwise all non-base layers will be in the same track
extractor_mode	extractor mode

Returns

error if any

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gf_media_split_hevc_tiles()

GF_Err gf_media_split_hevc_tiles	(	GF_ISOFile *	isom_file,
		u32	signal_only
	)

Split HEVC tiles into different tracks

Parameters

isom_file	the target ISOBMF file
signal_only	if set to 1 or 2, inserts tile description and NAL->tile mapping but does not create separate tracks. If 2, NAL->tile mapping uses RLE

Returns

error if any

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gf_media_filter_hevc()

GF_Err gf_media_filter_hevc	(	GF_ISOFile *	isom_file,
		u32	trackNumber,
		u8	max_temporal_id_plus_one,
		u8	max_layer_id_plus_one
	)

Filter HEVC/L-HEVC NALUs by temporal IDs and layer IDs, removing all NALUs above the desired levels.

Parameters

isom_file	the target ISOBMF file
trackNumber	the target track
max_temporal_id_plus_one	max temporal ID plus 1 of all NALUs to be removed.
max_layer_id_plus_one	max layer ID plus 1 of all NALUs to be removed.

Returns

error if any

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