Filter data exchange. More...

Collaboration diagram for Filter Packet:

Data Structures
struct	GF_FilterFrameInterface

Macros
#define	GF_FILTER_PCK_CRYPT 1

Typedefs
typedef struct __matrix	GF_Matrix_unexposed

Enumerations
enum	GF_FilterSAPType { GF_FILTER_SAP_NONE = 0 , GF_FILTER_SAP_1 , GF_FILTER_SAP_2 , GF_FILTER_SAP_3 , GF_FILTER_SAP_4 , GF_FILTER_SAP_4_PROL }

enum	GF_FilterClockType { GF_FILTER_CLOCK_NONE =0 , GF_FILTER_CLOCK_PCR , GF_FILTER_CLOCK_PCR_DISC }

enum	{ GF_FRAME_IFCE_BLOCKING = 1 , GF_FRAME_IFCE_MAIN_GLFB = 1<<1 }

Functions
GF_Err	gf_filter_pck_ref (GF_FilterPacket **pck)

GF_FilterPacket *	gf_filter_pck_ref_ex (GF_FilterPacket *pck)

void	gf_filter_pck_unref (GF_FilterPacket *pck)

GF_Err	gf_filter_pck_ref_props (GF_FilterPacket **pck)

GF_FilterPacket *	gf_filter_pck_new_alloc (GF_FilterPid PID, u32 data_size, u8 *data)

GF_FilterPacket *	gf_filter_pck_new_shared (GF_FilterPid PID, const u8 data, u32 data_size, gf_fsess_packet_destructor destruct)

GF_FilterPacket *	gf_filter_pck_new_ref (GF_FilterPid PID, u32 data_offset, u32 data_size, GF_FilterPacket source_packet)

GF_FilterPacket *	gf_filter_pck_new_ref_destructor (GF_FilterPid PID, u32 data_offset, u32 data_size, GF_FilterPacket source_packet, gf_fsess_packet_destructor destruct)

GF_FilterPacket *	gf_filter_pck_new_alloc_destructor (GF_FilterPid PID, u32 data_size, u8 *data, gf_fsess_packet_destructor destruct)

GF_FilterPacket *	gf_filter_pck_new_clone (GF_FilterPid PID, GF_FilterPacket pck_source, u8 **data)

GF_FilterPacket *	gf_filter_pck_new_copy (GF_FilterPid PID, GF_FilterPacket pck_source, u8 **data)

GF_FilterPacket *	gf_filter_pck_dangling_copy (GF_FilterPacket pck_source, GF_FilterPacket cached_pck)

GF_Err	gf_filter_pck_set_readonly (GF_FilterPacket *pck)

void	gf_filter_pck_check_realloc (GF_FilterPacket pck, u8 data, u32 size)

GF_Err	gf_filter_pck_send (GF_FilterPacket *pck)

void	gf_filter_pck_discard (GF_FilterPacket *pck)

GF_Err	gf_filter_pck_forward (GF_FilterPacket reference, GF_FilterPid PID)

const u8 *	gf_filter_pck_get_data (GF_FilterPacket pck, u32 size)

GF_Err	gf_filter_pck_set_property (GF_FilterPacket pck, u32 prop_4cc, const GF_PropertyValue value)

GF_Err	gf_filter_pck_set_property_str (GF_FilterPacket pck, const char name, const GF_PropertyValue *value)

GF_Err	gf_filter_pck_set_property_dyn (GF_FilterPacket pck, char name, const GF_PropertyValue *value)

Bool	gf_filter_pck_has_properties (GF_FilterPacket *pck)

GF_Err	gf_filter_pck_merge_properties (GF_FilterPacket pck_src, GF_FilterPacket pck_dst)

GF_Err	gf_filter_pck_merge_properties_filter (GF_FilterPacket pck_src, GF_FilterPacket pck_dst, gf_filter_prop_filter filter_prop, void *cbk)

const GF_PropertyValue *	gf_filter_pck_get_property (GF_FilterPacket *pck, u32 prop_4cc)

const GF_PropertyValue *	gf_filter_pck_get_property_str (GF_FilterPacket pck, const char prop_name)

const GF_PropertyValue *	gf_filter_pck_enum_properties (GF_FilterPacket pck, u32 idx, u32 prop_4cc, const char *prop_name)

GF_Err	gf_filter_pck_set_framing (GF_FilterPacket *pck, Bool is_start, Bool is_end)

GF_Err	gf_filter_pck_get_framing (GF_FilterPacket pck, Bool is_start, Bool *is_end)

GF_Err	gf_filter_pck_set_dts (GF_FilterPacket *pck, u64 dts)

u64	gf_filter_pck_get_dts (GF_FilterPacket *pck)

GF_Err	gf_filter_pck_set_cts (GF_FilterPacket *pck, u64 cts)

u64	gf_filter_pck_get_cts (GF_FilterPacket *pck)

u32	gf_filter_pck_get_timescale (GF_FilterPacket *pck)

GF_Err	gf_filter_pck_set_duration (GF_FilterPacket *pck, u32 duration)

u32	gf_filter_pck_get_duration (GF_FilterPacket *pck)

GF_Err	gf_filter_pck_expand (GF_FilterPacket pck, u32 nb_bytes_to_add, u8 data_start, u8 new_range_start, u32 new_size)

GF_Err	gf_filter_pck_truncate (GF_FilterPacket *pck, u32 size)

GF_Err	gf_filter_pck_set_sap (GF_FilterPacket *pck, GF_FilterSAPType sap_type)

GF_FilterSAPType	gf_filter_pck_get_sap (GF_FilterPacket *pck)

GF_Err	gf_filter_pck_set_interlaced (GF_FilterPacket *pck, u32 is_interlaced)

u32	gf_filter_pck_get_interlaced (GF_FilterPacket *pck)

GF_Err	gf_filter_pck_set_corrupted (GF_FilterPacket *pck, Bool is_corrupted)

Bool	gf_filter_pck_get_corrupted (GF_FilterPacket *pck)

GF_Err	gf_filter_pck_set_seek_flag (GF_FilterPacket *pck, Bool is_seek)

Bool	gf_filter_pck_get_seek_flag (GF_FilterPacket *pck)

GF_Err	gf_filter_pck_set_byte_offset (GF_FilterPacket *pck, u64 byte_offset)

u64	gf_filter_pck_get_byte_offset (GF_FilterPacket *pck)

GF_Err	gf_filter_pck_set_roll_info (GF_FilterPacket *pck, s16 roll_count)

s16	gf_filter_pck_get_roll_info (GF_FilterPacket *pck)

GF_Err	gf_filter_pck_set_crypt_flags (GF_FilterPacket *pck, u8 crypt_flag)

u8	gf_filter_pck_get_crypt_flags (GF_FilterPacket *pck)

GF_Err	gf_filter_pck_set_clock_type (GF_FilterPacket *pck, GF_FilterClockType ctype)

GF_FilterClockType	gf_filter_pid_get_clock_info (GF_FilterPid PID, u64 clock_val, u32 *timescale)

GF_FilterClockType	gf_filter_pck_get_clock_type (GF_FilterPacket *pck)

GF_Err	gf_filter_pck_set_carousel_version (GF_FilterPacket *pck, u8 version_number)

u8	gf_filter_pck_get_carousel_version (GF_FilterPacket *pck)

GF_Err	gf_filter_pck_set_dependency_flags (GF_FilterPacket *pck, u8 dep_flags)

u8	gf_filter_pck_get_dependency_flags (GF_FilterPacket *pck)

GF_Err	gf_filter_pck_set_seq_num (GF_FilterPacket *pck, u32 seq_num)

u32	gf_filter_pck_get_seq_num (GF_FilterPacket *pck)

GF_FilterPacket *	gf_filter_pck_new_frame_interface (GF_FilterPid PID, GF_FilterFrameInterface frame_ifce, gf_fsess_packet_destructor destruct)

GF_FilterFrameInterface *	gf_filter_pck_get_frame_interface (GF_FilterPacket *pck)

Bool	gf_filter_pck_is_blocking_ref (GF_FilterPacket *pck)

Detailed Description

Packets consist in block of data or reference to such blocks, passed from the source to the sink only. Internally, a packet created by a filter (output packet) is different from an input packet to a filter (gf_filter_pid_get_packet) but the API has been designed to hide this, so that most packet functions can be called regardless of the input/output nature of the PID.

Packets have native attributes (timing, sap state, ...) but may also have any number of properties associated to them.

The generic design of the architecture is that each filter is free to decide how it handle PIDs and their packets. This implies that the filter session has no clue how an output packet relates to an input packet. Developpers must therefore manually copy packet properties that seem relevant, or more practically copy all properties from input packet to output packet and reassign output packet properties changed by the filter.

In order to handle reordering of packets, it is possible to keep references to either packets (may block the filter chain), or packet properties.

Packets shall always be dispatched in their processing order (decode order). If reordering upon reception is needed, or AU interleaving is used, a filter SHALL do the reordering. However, packets do not have to be send in their creation order: a created packet is not assigned to PID buffers until it is sent.

Macro Definition Documentation

◆ GF_FILTER_PCK_CRYPT

#define GF_FILTER_PCK_CRYPT 1

Crypt flags for packet

Typedef Documentation

◆ GF_Matrix_unexposed

typedef struct __matrix GF_Matrix_unexposed

Redefinition of GF_Matrix but without the maths.h include which breaks VideoToolBox on OSX/iOS

Enumeration Type Documentation

◆ GF_FilterSAPType

enum GF_FilterSAPType

SAP types as defined in annex I of ISOBMFF

Enumerator
GF_FILTER_SAP_NONE	no SAP
GF_FILTER_SAP_1	closed gop no leading
GF_FILTER_SAP_2	closed gop leading
GF_FILTER_SAP_3	open gop
GF_FILTER_SAP_4	roll period (GDR or audio roll) - roll distance must be indicated in packet
GF_FILTER_SAP_4_PROL	Audio preroll period - roll distance must be indicated in packet

◆ GF_FilterClockType

enum GF_FilterClockType

Packet clock reference types - used for MPEG-2 TS

Enumerator
GF_FILTER_CLOCK_NONE	packet is not a clock reference
GF_FILTER_CLOCK_PCR	packet is a PCR clock reference, expressed in PID timescale
GF_FILTER_CLOCK_PCR_DISC	packet is a PCR clock discontinuity, expressed in PID timescale

◆ anonymous enum

anonymous enum

frame interface flags

Enumerator
GF_FRAME_IFCE_BLOCKING	When set , indicates that the emitting filter will block until this frame is released. Consumers of such a packet shall drop the packet as soon as possible, since it blocks the emiting filter.
GF_FRAME_IFCE_MAIN_GLFB	When set , indicates that the associated framebuffer is the main GL framebuffer.

Function Documentation

◆ gf_filter_pck_ref()

GF_Err gf_filter_pck_ref ( GF_FilterPacket ** pck )

Keeps a reference to the given input packet. The packet shall be released at some point using gf_filter_pck_unref

Filters keeping reference to packets should check if the packet is a blocking reference using gf_filter_pck_is_blocking_ref. If this is the case, the input chain will likely be blocked until the packet reference is released.

Parameters

pck	the target input packet

Returns: error if any

◆ gf_filter_pck_ref_ex()

GF_FilterPacket* gf_filter_pck_ref_ex ( GF_FilterPacket * pck )

Same as gf_filter_pck_ref but doesn't use pointer to packet

Parameters

pck	the target input packet

Returns: the new reference to the packet

◆ gf_filter_pck_unref()

void gf_filter_pck_unref ( GF_FilterPacket * pck )

Remove a reference to the given input packet. The packet might be destroyed after that call.

Parameters

pck	the target input packet

◆ gf_filter_pck_ref_props()

GF_Err gf_filter_pck_ref_props ( GF_FilterPacket ** pck )

Creates a reference to the packet properties, but not to the data. This is mostly useful for encoders/decoders/filters with delay, where the input packet needs to be released before getting the corresponding output (frame reordering & co). This allows merging back packet properties after some delay without blocking the filter chain.

Parameters

pck	the target input packet

Returns: error if any

◆ gf_filter_pck_new_alloc()

GF_FilterPacket* gf_filter_pck_new_alloc	(	GF_FilterPid *	PID,
		u32	data_size,
		u8 **	data
	)

Allocates a new packet on the output PID with associated allocated data. The packet has by default no DTS, no CTS, no duration framing set to full frame (start=end=1) and all other flags set to 0 (including SAP type).

Parameters

PID	the target output PID
data_size	the desired size of the packet - can be changed later
data	set to the writable buffer of the created packet

Returns: new packet or NULL if allocation error or not an output PID

◆ gf_filter_pck_new_shared()

GF_FilterPacket* gf_filter_pck_new_shared	(	GF_FilterPid *	PID,
		const u8 *	data,
		u32	data_size,
		gf_fsess_packet_destructor	destruct
	)

Allocates a new packet on the output PID referencing internal data. The packet has by default no DTS, no CTS, no duration framing set to full frame (start=end=1) and all other flags set to 0 (including SAP type).

Parameters

PID	the target output PID
data	the data block to dispatch
data_size	the size of the data block to dispatch
destruct	the callback function used to destroy the packet when no longer used - may be NULL

Returns: new packet or NULL if allocation error or not an output PID

◆ gf_filter_pck_new_ref()

GF_FilterPacket* gf_filter_pck_new_ref	(	GF_FilterPid *	PID,
		u32	data_offset,
		u32	data_size,
		GF_FilterPacket *	source_packet
	)

Allocates a new packet on the output PID referencing data of some input packet. The packet has by default no DTS, no CTS, no duration framing set to full frame (start=end=1) and all other flags set to 0 (including SAP type).

Parameters

PID	the target output PID
data_offset	offset in the source data block
data_size	the size of the data block to dispatch - if 0, the entire data of the source packet beginning at offset is used
source_packet	the source packet this data belongs to (at least from the filter point of view).

Returns: new packet or NULL if allocation error or not an output PID

◆ gf_filter_pck_new_ref_destructor()

GF_FilterPacket* gf_filter_pck_new_ref_destructor	(	GF_FilterPid *	PID,
		u32	data_offset,
		u32	data_size,
		GF_FilterPacket *	source_packet,
		gf_fsess_packet_destructor	destruct
	)

Same as gf_filter_pck_new_ref with packet destructor callbacl

Parameters

PID	the target output PID
data_offset	offset in the source data block
data_size	the size of the data block to dispatch - if 0, the entire data of the source packet beginning at offset is used
source_packet	the source packet this data belongs to (at least from the filter point of view).
destruct	the callback function used to destroy the packet when no longer used - may be NULL

Returns: new packet or NULL if allocation error or not an output PID

◆ gf_filter_pck_new_alloc_destructor()

GF_FilterPacket* gf_filter_pck_new_alloc_destructor	(	GF_FilterPid *	PID,
		u32	data_size,
		u8 **	data,
		gf_fsess_packet_destructor	destruct
	)

Allocates a new packet on the output PID with associated allocated data. The packet has by default no DTS, no CTS, no duration framing set to full frame (start=end=1) and all other flags set to 0 (including SAP type).

Parameters

PID	the target output PID
data_size	the desired size of the packet - can be changed later
data	set to the writable buffer of the created packet
destruct	the callback function used to destroy the packet when no longer used - may be NULL

Returns: new packet or NULL if allocation error or not an output PID

◆ gf_filter_pck_new_clone()

GF_FilterPacket* gf_filter_pck_new_clone	(	GF_FilterPid *	PID,
		GF_FilterPacket *	pck_source,
		u8 **	data
	)

Clones a new packet from a source packet and copy all source properties to output. If the source packet uses a frame interface object or has no associated data, returns a copy of the packet. If the source packet is referenced more than once (ie more than just the caller), a new packet on the output PID is allocated with source data copied. Otherwise, the source data is assigned to the output packet. This is typically called by filter wishing to perform in-place processing of input data.

Parameters

PID	the target output PID
pck_source	the desired source packet to clone
data	set to the writable buffer of the created packet

Returns: new packet or NULL if allocation error or not an output PID

◆ gf_filter_pck_new_copy()

GF_FilterPacket* gf_filter_pck_new_copy	(	GF_FilterPid *	PID,
		GF_FilterPacket *	pck_source,
		u8 **	data
	)

Copies a new packet from a source packet and copy all source properties to output.

Parameters

PID	the target output PID
pck_source	the desired source packet to clone
data	set to the writable buffer of the created packet

Returns: new packet or NULL if allocation error or not an output PID

◆ gf_filter_pck_dangling_copy()

GF_FilterPacket* gf_filter_pck_dangling_copy	(	GF_FilterPacket *	pck_source,
		GF_FilterPacket *	cached_pck
	)

Creates a read-only detached copy of a packet from a source packet and copy all source properties to output.

If the source packet uses a frame interface object or has no associated data, returns a copy of the packet. If the source packet is referenced more than once (ie more than just the caller), a new packet on the output PID is allocated with source data copied. Otherwise, the source data is assigned to the output packet.

This is typically called by filters requiring read access to data for packets using frame interfaces

Warning: The cloned packet will not have any dynamic properties set.

Parameters

pck_source	the target source packet
cached_pck	if not NULL, will try to reuse this packet if possible (if not possible, this packet will be destroyed)

Returns: new packet or NULL if allocation error or not an output PID

◆ gf_filter_pck_set_readonly()

GF_Err gf_filter_pck_set_readonly ( GF_FilterPacket * pck )

Marks memory of a shared packet as non-writable. By default gf_filter_pck_new_shared and gf_filter_pck_new_ref allow write access to internal memory in case the packet can be cloned (single reference used). If your filter relies on the content of the shared memory for its internal state, packet must be marked as read-only to avoid later state corruption. Note that packets created with gf_filter_pck_new_frame_interface are always treated as read-only packets

Parameters

pck	the target output packet to send

Returns: error if any

◆ gf_filter_pck_check_realloc()

void gf_filter_pck_check_realloc	(	GF_FilterPacket *	pck,
		u8 *	data,
		u32	size
	)

Checks if packet data has been reallocated

There are cases where memory allocated by gf_filter_pck_new_ref allow needs to be reallocated without using gf_filter_pck_expand . This function allows checking if the data has changed, and if so reassign the new block to the packet. If the data pointer was not changed, the packet data size is updated to the new size (acts as gf_filter_pck_truncate). The data shall have been reallocated with gf_realloc.

Parameters

pck	the target packet to send
data	the reallocated data pointer
size	the reallocated data size

◆ gf_filter_pck_send()

GF_Err gf_filter_pck_send ( GF_FilterPacket * pck )

Sends the packet on its output PID. Packets SHALL be sent in processing order (eg, decoding order for video). However, packets don't have to be sent in their allocation order.

Parameters

pck	the target output packet to send

Returns: error if any

◆ gf_filter_pck_discard()

void gf_filter_pck_discard ( GF_FilterPacket * pck )

Destructs a packet allocated but that cannot be sent. Shall not be used on packet references.

Parameters

pck	the target output packet to send

◆ gf_filter_pck_forward()

GF_Err gf_filter_pck_forward	(	GF_FilterPacket *	reference,
		GF_FilterPid *	PID
	)

Destructs a packet allocated but that cannot be sent. Shall not be used on packet references. This is a shortcut to gf_filter_pck_new_ref + gf_filter_pck_merge_properties + gf_filter_pck_send

Parameters

reference	the input packet to forward
PID	the output PID to forward to

Returns: error code if any

◆ gf_filter_pck_get_data()

const u8* gf_filter_pck_get_data	(	GF_FilterPacket *	pck,
		u32 *	size
	)

Gets data associated with the packet.

Parameters

pck	the target packet
size	set to the packet data size

Returns: packet data if any, NULL if empty or if the packet uses a frame interface object. See gf_filter_pck_get_frame_interface

◆ gf_filter_pck_set_property()

GF_Err gf_filter_pck_set_property	(	GF_FilterPacket *	pck,
		u32	prop_4cc,
		const GF_PropertyValue *	value
	)

Sets a built-in property of a packet

Parameters

pck	the target packet
prop_4cc	the code of the built-in property to set
value	the property value to set

Returns: error code if any

◆ gf_filter_pck_set_property_str()

GF_Err gf_filter_pck_set_property_str	(	GF_FilterPacket *	pck,
		const char *	name,
		const GF_PropertyValue *	value
	)

Sets a property of a packet

Parameters

pck	the target packet
name	the name of the property to set
value	the property value to set

Returns: error code if any

◆ gf_filter_pck_set_property_dyn()

GF_Err gf_filter_pck_set_property_dyn	(	GF_FilterPacket *	pck,
		char *	name,
		const GF_PropertyValue *	value
	)

Sets a property of a packet

Parameters

pck	the target packet
name	the code of the property to set. The name will be copied to the property, and memory destruction performed by the filter session
value	the property value to set

Returns: error code if any

◆ gf_filter_pck_has_properties()

Bool gf_filter_pck_has_properties ( GF_FilterPacket * pck )

Checks if a packet has properties other than packet built-in ones

This is typically needed to decide whether a packet with no data should be forwarded or not

Parameters

pck	the target packet

Returns: GF_TRUE if packet has properties, GF_FALSE otherwise

◆ gf_filter_pck_merge_properties()

GF_Err gf_filter_pck_merge_properties	(	GF_FilterPacket *	pck_src,
		GF_FilterPacket *	pck_dst
	)

Merge properties of source packet into destination packet but does NOT reset destination packet properties

Parameters

pck_src	source packet
pck_dst	destination packet

Returns: error code if any

◆ gf_filter_pck_merge_properties_filter()

GF_Err gf_filter_pck_merge_properties_filter	(	GF_FilterPacket *	pck_src,
		GF_FilterPacket *	pck_dst,
		gf_filter_prop_filter	filter_prop,
		void *	cbk
	)

Same as gf_filter_pck_merge_properties but uses a filter callback to select properties to merge

Parameters

pck_src	source packet
pck_dst	destination packet
filter_prop	callback filtering function
cbk	callback data passed to the callback function

Returns: error code if any

◆ gf_filter_pck_get_property()

const GF_PropertyValue* gf_filter_pck_get_property	(	GF_FilterPacket *	pck,
		u32	prop_4cc
	)

Gets built-in property of packet.

Parameters

pck	target packet
prop_4cc	the code of the built-in property

Returns: the property if found, NULL otherwise

◆ gf_filter_pck_get_property_str()

const GF_PropertyValue* gf_filter_pck_get_property_str	(	GF_FilterPacket *	pck,
		const char *	prop_name
	)

Gets property of packet.

Parameters

pck	target packet
prop_name	the name of the property

Returns: the property if found, NULL otherwise

◆ gf_filter_pck_enum_properties()

const GF_PropertyValue* gf_filter_pck_enum_properties	(	GF_FilterPacket *	pck,
		u32 *	idx,
		u32 *	prop_4cc,
		const char **	prop_name
	)

Enumerates properties on packets.

Parameters

pck	target packet
idx	input/output index of the current property. 0 means first. Incremented by 1 upon success
prop_4cc	set to the code of the built-in property
prop_name	set to the name of the property

Returns: the property if found, NULL otherwise

◆ gf_filter_pck_set_framing()

GF_Err gf_filter_pck_set_framing	(	GF_FilterPacket *	pck,
		Bool	is_start,
		Bool	is_end
	)

Sets packet framing info. A full frame is a complete entity for the stream type, ie an access unit for media streams and a complete file for file streams

Parameters

pck	target packet
is_start	packet is start of the frame
is_end	packet is end of the frame

Returns: error code if any

◆ gf_filter_pck_get_framing()

GF_Err gf_filter_pck_get_framing	(	GF_FilterPacket *	pck,
		Bool *	is_start,
		Bool *	is_end
	)

Gets packet framing info. A full frame is a complete entity for the stream type, ie an access unit for media streams and a complete file for file streams

Parameters

pck	target packet
is_start	set to GF_TRUE if packet is start of the frame, to GF_FALSE otherwise
is_end	set to GF_TRUE if packet is end of the frame, to GF_FALSE otherwise

Returns: error code if any

◆ gf_filter_pck_set_dts()

GF_Err gf_filter_pck_set_dts	(	GF_FilterPacket *	pck,
		u64	dts
	)

Sets Decoding Timestamp (DTS) of the packet. Do not set if unknown - automatic packet duration is based on DTS diff if DTS is present, otherwise in CTS diff.

Parameters

pck	target packet
dts	decoding timestamp of packet, in PID timescale units

Returns: error code if any

◆ gf_filter_pck_get_dts()

u64 gf_filter_pck_get_dts ( GF_FilterPacket * pck )

Gets Decoding Timestamp (DTS) of the packet.

Parameters

pck	target packet

Returns: dts decoding timestamp of packet, in PID timescale units

◆ gf_filter_pck_set_cts()

GF_Err gf_filter_pck_set_cts	(	GF_FilterPacket *	pck,
		u64	cts
	)

Sets Composition Timestamp (CTS) of the packet. Do not set if unknown - automatic packet duration is based on DTS diff if DTS is present, otherwise in CTS diff.

Parameters

pck	target packet
cts	composition timestamp of packet, in PID timescale units

Returns: error code if any

◆ gf_filter_pck_get_cts()

u64 gf_filter_pck_get_cts ( GF_FilterPacket * pck )

Gets Composition Timestamp (CTS) of the packet.

Parameters

pck	target packet

Returns: cts composition timestamp of packet, in PID timescale units

◆ gf_filter_pck_get_timescale()

u32 gf_filter_pck_get_timescale ( GF_FilterPacket * pck )

Returns packet timescale (same as PID timescale)

Parameters

pck	target packet

Returns: packet timescale

◆ gf_filter_pck_set_duration()

GF_Err gf_filter_pck_set_duration	(	GF_FilterPacket *	pck,
		u32	duration
	)

Sets packet duration

Parameters

pck	target packet
duration	duration of packet, in PID timescale units

Returns: error code if any

◆ gf_filter_pck_get_duration()

u32 gf_filter_pck_get_duration ( GF_FilterPacket * pck )

Gets packet duration

Parameters

pck	target packet

Returns: duration duration of packet, in PID timescale units

◆ gf_filter_pck_expand()

GF_Err gf_filter_pck_expand	(	GF_FilterPacket *	pck,
		u32	nb_bytes_to_add,
		u8 **	data_start,
		u8 **	new_range_start,
		u32 *	new_size
	)

reallocates packet not yet sent. Returns data start and new range of data. This will reset byte offset information to not available.

Parameters

pck	target packet
nb_bytes_to_add	bytes to add to packet
data_start	realloc pointer of packet data start - may be NULL if new_range_start is set
new_range_start	pointer to new (apppended space) data - may be NULL if data_start is set
new_size	full size of allocated block. - may be be NULL

Returns: error code if any

◆ gf_filter_pck_truncate()

GF_Err gf_filter_pck_truncate	(	GF_FilterPacket *	pck,
		u32	size
	)

Truncates packet not yet sent to given size

Parameters

pck	target packet
size	new size to truncate to

Returns: error code if any

◆ gf_filter_pck_set_sap()

GF_Err gf_filter_pck_set_sap	(	GF_FilterPacket *	pck,
		GF_FilterSAPType	sap_type
	)

Sets packet SAP type

Parameters

pck	target packet
sap_type	SAP type of the packet

Returns: error code if any

◆ gf_filter_pck_get_sap()

GF_FilterSAPType gf_filter_pck_get_sap ( GF_FilterPacket * pck )

Sets packet SAP type

Parameters

pck	target packet

Returns: sap_type SAP type of the packet

◆ gf_filter_pck_set_interlaced()

GF_Err gf_filter_pck_set_interlaced	(	GF_FilterPacket *	pck,
		u32	is_interlaced
	)

Sets packet video interlacing flag

Parameters

pck	target packet
is_interlaced	set to 0: not interlaced 1: top field first or contains only top field if packet not full frame 2: bottom field first or contains only bottom field.

Returns: error code if any

◆ gf_filter_pck_get_interlaced()

u32 gf_filter_pck_get_interlaced ( GF_FilterPacket * pck )

Gets packet video interlacing flag

Parameters

pck	target packet

Returns: interlaced flag, see gf_filter_pck_set_interlaced

◆ gf_filter_pck_set_corrupted()

GF_Err gf_filter_pck_set_corrupted	(	GF_FilterPacket *	pck,
		Bool	is_corrupted
	)

Sets packet corrupted data flag

Parameters

pck	target packet
is_corrupted	indicates if data in packet is corrupted

Returns: error code if any

◆ gf_filter_pck_get_corrupted()

Bool gf_filter_pck_get_corrupted ( GF_FilterPacket * pck )

Gets packet corrupted data flag

Parameters

pck	target packet

Returns: GF_TRUE if data in packet is corrupted

◆ gf_filter_pck_set_seek_flag()

GF_Err gf_filter_pck_set_seek_flag	(	GF_FilterPacket *	pck,
		Bool	is_seek
	)

Sets seek flag of packet. For PIDs of stream type FILE with GF_PROP_PID_DISABLE_PROGRESSIVE set, the seek flag set to GF_TRUE indicates that the packet is a PATCH packet, replacing bytes located at gf_filter_pck_get_byte_offset in file if the interlaced flag of the packet is not set, or inserting bytes located at gf_filter_pck_get_byte_offset in file if the interlaced flag of the packet is set. If the corrupted flag is set, this indicates the data will be replaced later on. A seek packet is not meant to be displayed but is needed for decoding.

Note: If a packet is partially skipped but completely decoded, it shall not be marked as seek but have the property "SkipBegin" set.; Raw audio packets MUST be split at the proper boundary

Parameters

pck	target packet
is_seek	indicates packet is seek frame

Returns: error code if any

◆ gf_filter_pck_get_seek_flag()

Bool gf_filter_pck_get_seek_flag ( GF_FilterPacket * pck )

Gets packet seek data flag

Parameters

pck	target packet

Returns: GF_TRUE if packet is a seek packet

◆ gf_filter_pck_set_byte_offset()

GF_Err gf_filter_pck_set_byte_offset	(	GF_FilterPacket *	pck,
		u64	byte_offset
	)

Sets packet byte offset in source. byte offset should only be set if the data in the packet is exactly the same as the one at the given byte offset

Parameters

pck	target packet
byte_offset	indicates the byte offset in the source. By default packets are created with no byte offset

Returns: error code if any

◆ gf_filter_pck_get_byte_offset()

u64 gf_filter_pck_get_byte_offset ( GF_FilterPacket * pck )

Sets packet byte offset in source

Parameters

pck	target packet

Returns: byte offset in the source

◆ gf_filter_pck_set_roll_info()

GF_Err gf_filter_pck_set_roll_info	(	GF_FilterPacket *	pck,
		s16	roll_count
	)

Sets packet roll info (number of packets to rewind/forward and decode to get a clean access point).

Parameters

pck	target packet
roll_count	indicates the roll distance of this packet - only used for SAP 4 for now

Returns: error code if any

◆ gf_filter_pck_get_roll_info()

s16 gf_filter_pck_get_roll_info ( GF_FilterPacket * pck )

Gets packet roll info.

Parameters

pck	target packet

Returns: roll distance of this packet; error code if any

◆ gf_filter_pck_set_crypt_flags()

GF_Err gf_filter_pck_set_crypt_flags	(	GF_FilterPacket *	pck,
		u8	crypt_flag
	)

Sets packet crypt flags

Parameters

pck	target packet
crypt_flag	packet crypt flag

Returns: error code if any

◆ gf_filter_pck_get_crypt_flags()

u8 gf_filter_pck_get_crypt_flags ( GF_FilterPacket * pck )

Gets packet crypt flags

Parameters

pck	target packet

Returns: packet crypt flag

◆ gf_filter_pck_set_clock_type()

GF_Err gf_filter_pck_set_clock_type	(	GF_FilterPacket *	pck,
		GF_FilterClockType	ctype
	)

Sets packet clock type

Parameters

pck	target packet
ctype	packet clock flag

Returns: error code if any

◆ gf_filter_pid_get_clock_info()

GF_FilterClockType gf_filter_pid_get_clock_info	(	GF_FilterPid *	PID,
		u64 *	clock_val,
		u32 *	timescale
	)

Gets last clock type and clock value on PID. Always returns 0 if the source filter manages clock references internally cd gf_filter_pid_set_clock_mode.

Parameters

PID	target PID to query for clock
clock_val	last clock reference found
timescale	last clock reference timescale

Returns: ctype packet clock flag

◆ gf_filter_pck_get_clock_type()

GF_FilterClockType gf_filter_pck_get_clock_type ( GF_FilterPacket * pck )

Gets clock type of packet. Always returns 0 if the source filter does NOT manages clock references internally cd gf_filter_pid_set_clock_mode.

Parameters

pck	target packet

Returns: ctype packet clock flag

◆ gf_filter_pck_set_carousel_version()

GF_Err gf_filter_pck_set_carousel_version	(	GF_FilterPacket *	pck,
		u8	version_number
	)

Sets packet carousel info

Parameters

pck	target packet
version_number	carousel version number associated with this data chunk

Returns: error code if any

◆ gf_filter_pck_get_carousel_version()

u8 gf_filter_pck_get_carousel_version ( GF_FilterPacket * pck )

Gets packet carousel info

Parameters

pck	target packet

Returns: version_number carousel version number associated with this data chunk

◆ gf_filter_pck_set_dependency_flags()

GF_Err gf_filter_pck_set_dependency_flags	(	GF_FilterPacket *	pck,
		u8	dep_flags
	)

Sets packet sample dependency flags.

Sample dependency flags have the same semantics as ISOBMFF:
bit(2)is_leading bit(2)sample_depends_on (2)sample_is_depended_on (2)sample_has_redundancy

is_leading takes one of the following four values:
0: the leading nature of this sample is unknown;
1: this sample is a leading sample that has a dependency before the referenced I-picture (and is therefore not decodable);
2: this sample is not a leading sample;
3: this sample is a leading sample that has no dependency before the referenced I-picture (and is therefore decodable);
sample_depends_on takes one of the following four values:
0: the dependency of this sample is unknown;
1: this sample does depend on others (not an I picture);
2: this sample does not depend on others (I picture);
3: reserved
sample_is_depended_on takes one of the following four values:
0: the dependency of other samples on this sample is unknown;
1: other samples may depend on this one (not disposable);
2: no other sample depends on this one (disposable);
3: reserved
sample_has_redundancy takes one of the following four values:
0: it is unknown whether there is redundant coding in this sample;
1: there is redundant coding in this sample;
2: there is no redundant coding in this sample;
3: reserved

Parameters

pck	target packet
dep_flags	sample dependency flags

Returns: error code if any

◆ gf_filter_pck_get_dependency_flags()

u8 gf_filter_pck_get_dependency_flags ( GF_FilterPacket * pck )

Gets packet sample dependency flags.

Parameters

pck	target packet

Returns: dep_flags sample dependency flags - see gf_filter_pck_set_dependency_flags for syntax.

◆ gf_filter_pck_set_seq_num()

GF_Err gf_filter_pck_set_seq_num	(	GF_FilterPacket *	pck,
		u32	seq_num
	)

Sets packet sequence number. Shall only be used when a filter handles a PLAY request based on packet sequence number

Parameters

pck	target packet
seq_num	sequence number of packet

Returns: error code if any

◆ gf_filter_pck_get_seq_num()

u32 gf_filter_pck_get_seq_num ( GF_FilterPacket * pck )

Gets packet sequence number info

Parameters

pck	target packet

Returns: sequence number associated with this packet

◆ gf_filter_pck_new_frame_interface()

GF_FilterPacket* gf_filter_pck_new_frame_interface	(	GF_FilterPid *	PID,
		GF_FilterFrameInterface *	frame_ifce,
		gf_fsess_packet_destructor	destruct
	)

Allocates a new packet holding a reference to a frame interface object. The packet has by default no DTS, no CTS, no duration framing set to full frame (start=end=1) and all other flags set to 0 (including SAP type).

Parameters

PID	the target output PID
frame_ifce	the associated frame interface object
destruct	the destructor to be called upon packet release

Returns: new packet

◆ gf_filter_pck_get_frame_interface()

GF_FilterFrameInterface* gf_filter_pck_get_frame_interface ( GF_FilterPacket * pck )

Gets a frame interface associated with a packet if any.

Consumers will typically first check if the packet has associated data using gf_filter_pck_get_data.

Parameters

pck	the target packet

Returns: the associated frame interface object if any, or NULL otherwise

◆ gf_filter_pck_is_blocking_ref()

Bool gf_filter_pck_is_blocking_ref ( GF_FilterPacket * pck )

Checks if the packet is a blocking reference, i.e. a parent filter in the chain is waiting for its destruction to emit a new packet. This is typically used by sink filters to decide if they can hold references to input packets without blocking the chain.

Parameters

pck	the target packet

Returns: GF_TRUE if the packet is blocking or is a reference to a blocking packet, GF_FALSE otherwise

Data Structures

Macros

Typedefs

Enumerations

Functions

Detailed Description

Macro Definition Documentation

◆ GF_FILTER_PCK_CRYPT

Typedef Documentation

◆ GF_Matrix_unexposed

Enumeration Type Documentation

◆ GF_FilterSAPType

◆ GF_FilterClockType

◆ anonymous enum

Function Documentation

◆ gf_filter_pck_ref()

◆ gf_filter_pck_ref_ex()

◆ gf_filter_pck_unref()

◆ gf_filter_pck_ref_props()

◆ gf_filter_pck_new_alloc()

◆ gf_filter_pck_new_shared()

◆ gf_filter_pck_new_ref()

◆ gf_filter_pck_new_ref_destructor()

◆ gf_filter_pck_new_alloc_destructor()

◆ gf_filter_pck_new_clone()

◆ gf_filter_pck_new_copy()

◆ gf_filter_pck_dangling_copy()

◆ gf_filter_pck_set_readonly()

◆ gf_filter_pck_check_realloc()

◆ gf_filter_pck_send()

◆ gf_filter_pck_discard()

◆ gf_filter_pck_forward()

◆ gf_filter_pck_get_data()

◆ gf_filter_pck_set_property()

◆ gf_filter_pck_set_property_str()

◆ gf_filter_pck_set_property_dyn()

◆ gf_filter_pck_has_properties()

◆ gf_filter_pck_merge_properties()

◆ gf_filter_pck_merge_properties_filter()

◆ gf_filter_pck_get_property()

◆ gf_filter_pck_get_property_str()

◆ gf_filter_pck_enum_properties()

◆ gf_filter_pck_set_framing()

◆ gf_filter_pck_get_framing()

◆ gf_filter_pck_set_dts()

◆ gf_filter_pck_get_dts()

◆ gf_filter_pck_set_cts()

◆ gf_filter_pck_get_cts()

◆ gf_filter_pck_get_timescale()

◆ gf_filter_pck_set_duration()

◆ gf_filter_pck_get_duration()

◆ gf_filter_pck_expand()

◆ gf_filter_pck_truncate()

◆ gf_filter_pck_set_sap()

◆ gf_filter_pck_get_sap()

◆ gf_filter_pck_set_interlaced()

◆ gf_filter_pck_get_interlaced()

◆ gf_filter_pck_set_corrupted()

◆ gf_filter_pck_get_corrupted()

◆ gf_filter_pck_set_seek_flag()

◆ gf_filter_pck_get_seek_flag()

◆ gf_filter_pck_set_byte_offset()

◆ gf_filter_pck_get_byte_offset()

◆ gf_filter_pck_set_roll_info()

◆ gf_filter_pck_get_roll_info()

◆ gf_filter_pck_set_crypt_flags()

◆ gf_filter_pck_get_crypt_flags()

◆ gf_filter_pck_set_clock_type()

◆ gf_filter_pid_get_clock_info()

◆ gf_filter_pck_get_clock_type()

◆ gf_filter_pck_set_carousel_version()

◆ gf_filter_pck_get_carousel_version()

◆ gf_filter_pck_set_dependency_flags()

◆ gf_filter_pck_get_dependency_flags()

◆ gf_filter_pck_set_seq_num()

◆ gf_filter_pck_get_seq_num()

◆ gf_filter_pck_new_frame_interface()

◆ gf_filter_pck_get_frame_interface()

◆ gf_filter_pck_is_blocking_ref()