Generic API

Collaboration diagram for Generic API:

Enumerations
enum	GF_ISOOpenMode {   GF_ISOM_OPEN_READ_DUMP = 0 , GF_ISOM_OPEN_READ , GF_ISOM_OPEN_WRITE , GF_ISOM_OPEN_EDIT ,   GF_ISOM_WRITE_EDIT , GF_ISOM_OPEN_KEEP_FRAGMENTS , GF_ISOM_OPEN_READ_EDIT , GF_ISOM_OPEN_READ_DUMP_NO_COMP }

Functions
u32	gf_isom_probe_file (const char *fileName)
u32	gf_isom_probe_file_range (const char *fileName, u64 start_range, u64 end_range)
u32	gf_isom_probe_data (const u8 *inBuf, u32 inSize)
GF_ISOFile *	gf_isom_open (const char *fileName, GF_ISOOpenMode OpenMode, const char *tmp_dir)
GF_Err	gf_isom_close (GF_ISOFile *isom_file)
void	gf_isom_delete (GF_ISOFile *isom_file)
GF_Err	gf_isom_last_error (GF_ISOFile *isom_file)
u8	gf_isom_get_mode (GF_ISOFile *isom_file)
Bool	gf_isom_is_JPEG2000 (GF_ISOFile *isom_file)
Bool	gf_isom_is_video_handler_type (u32 mtype)
u32	gf_isom_get_num_supported_boxes ()
u32	gf_isom_get_supported_box_type (u32 idx)
GF_Err	gf_isom_dump_supported_box (u32 idx, FILE *trace)

Detailed Description

Generic API functions

Enumeration Type Documentation

GF_ISOOpenMode

enum GF_ISOOpenMode

Movie file opening modes

Enumerator
GF_ISOM_OPEN_READ_DUMP	Opens file for dumping: same as read-only but keeps all movie fragments info untouched
GF_ISOM_OPEN_READ	Opens a file in READ ONLY mode
GF_ISOM_OPEN_WRITE	Opens a file in WRITE ONLY mode. Media Data is captured on the fly and storage mode is always flat (moov at end). In this mode, the editing functions are disabled.
GF_ISOM_OPEN_EDIT	Opens an existing file in EDIT mode
GF_ISOM_WRITE_EDIT	Creates a new file in EDIT mode
GF_ISOM_OPEN_KEEP_FRAGMENTS	Opens an existing file and keep fragment information
GF_ISOM_OPEN_READ_EDIT	Opens an existing file in READ ONLY mode but enables most of the file edit functions except fragmentation Samples may be added to the file in this mode, they will be stored in memory
GF_ISOM_OPEN_READ_DUMP_NO_COMP	same as GF_ISOM_OPEN_READ_DUMP but does not decompress boxes

Function Documentation

gf_isom_probe_file()

u32 gf_isom_probe_file

(

const char *

fileName

)

indicates if target file is an IsoMedia file

Parameters

fileName

the target local file name or path to probe, gmem:// or gfio:// resource

Returns

1 if it is a non-special file, 2 if an init segment, 3 if a media segment, 0 otherwise

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gf_isom_probe_file_range()

u32 gf_isom_probe_file_range	(	const char *	fileName,
		u64	start_range,
		u64	end_range
	)

indicates if target file is an IsoMedia file

Parameters

fileName	the target local file name or path to probe, gmem:// or gfio:// resource
start_range	the offset in the file to start probing from
end_range	the offset in the file at which probing shall stop

Returns

1 if it is a non-special file, 2 if an init segment, 3 if a media segment, 4 if empty or no file, 0 otherwise

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gf_isom_probe_data()

u32 gf_isom_probe_data	(	const u8 *	inBuf,
		u32	inSize
	)

indicates if target file is an IsoMedia file

Parameters

inBuf	the buffer to probe
inSize	the sizeo of the buffer to probe

Returns

1 if it is a non-special file, 2 if an init segment, 3 if a media segment, 0 otherwise (non recognized or too short)

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gf_isom_open()

GF_ISOFile * gf_isom_open	(	const char *	fileName,
		GF_ISOOpenMode	OpenMode,
		const char *	tmp_dir
	)

opens an isoMedia File.

Parameters

fileName	name of the file to open, , gmem:// or gfio:// resource. The special name "_gpac_isobmff_redirect" is used to indicate that segment shall be written to a memory buffer passed to callback function set through gf_isom_set_write_callback. SHALL not be NULL.
OpenMode	file opening mode
tmp_dir	for the 2 edit modes only, specifies a location for temp file. If NULL, the library will use the default libgpac temporary file management schemes.

Returns

the created ISO file if no error

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gf_isom_close()

GF_Err gf_isom_close

(

GF_ISOFile *

isom_file

)

closes the file, write it if new/edited or if pending fragment

Parameters

isom_file

the target ISO file

Returns

error if any

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gf_isom_delete()

void gf_isom_delete

(

GF_ISOFile *

isom_file

)

deletes the movie without saving it

Parameters

isom_file

the target ISO file

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gf_isom_last_error()

GF_Err gf_isom_last_error

(

GF_ISOFile *

isom_file

)

gets the last fatal error that occured in the file ANY FUNCTION OF THIS API WON'T BE PROCESSED IF THE FILE HAS AN ERROR

Note

Some function may return an error while the movie has no error the last error is a FatalError, and is not always set if a bad param is specified...

Parameters

isom_file

the target ISO file

Returns

error if any

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gf_isom_get_mode()

u8 gf_isom_get_mode

(

GF_ISOFile *

isom_file

)

gets the mode of an open file

Parameters

isom_file

the target ISO file

Returns

open mode of the file

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gf_isom_is_JPEG2000()

Bool gf_isom_is_JPEG2000

(

GF_ISOFile *

isom_file

)

checks if file is J2K image

Parameters

isom_file

the target ISO file

Returns

GF_TRUE if file is a j2k image, GF_FALSE otherwise

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gf_isom_is_video_handler_type()

Bool gf_isom_is_video_handler_type

(

u32

mtype

)

checks if a given four character code matches a known video handler type (vide, auxv, pict, ...)

Parameters

mtype

the four character code to check

Returns

GF_TRUE if the type is a video media type

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gf_isom_get_num_supported_boxes()

u32 gf_isom_get_num_supported_boxes

(

)

gets number of implemented boxes in (including the internal unknown box wrapper).

Note

There can be several times the same type returned due to variation of the box (versions or flags)

Returns

number of implemented boxes

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gf_isom_get_supported_box_type()

u32 gf_isom_get_supported_box_type

(

u32

idx

)

gets four character code of box given its index. Index 0 is GPAC internal unknown box handler

Parameters

idx	0-based index of the box

Returns

four character code of the box

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gf_isom_dump_supported_box()

GF_Err gf_isom_dump_supported_box	(	u32	idx,
		FILE *	trace
	)

prints default box syntax of box given its index. Index 0 is GPAC internal unknown box handler

Parameters

idx	0-based index of the box
trace	the file object to dump to

Returns

error if any

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