ContainerMP4 Class Reference

Minimum flexible parser for MPEG4 data (which is based on the Quicktime format). Small atoms will be make available via a callback method. The big (audio) content is written to the Print object which was specified in the constructor. Depends on https://github.com/pschatzmann/arduino-libhelix! More...

#include <ContainerMP4.h>

Inheritance diagram for ContainerMP4:

Public Member Functions
	ContainerMP4 (AudioDecoder &decoder, const char *streamAtom="mdat")
	ContainerMP4 (AudioDecoder *decoder, const char *streamAtom="mdat")
	ContainerMP4 (const char *streamAtom="mdat")
virtual void	addNotifyAudioChange (AudioInfoSupport &bi)
	Adds target to be notified about audio changes.
virtual AudioInfo	audioInfo ()
	provides the actual input AudioInfo
virtual AudioInfo	audioInfoOut ()
	provides the actual output AudioInfo: this is usually the same as audioInfo() unless we use a transforming stream
bool	begin () override
	starts the processing
virtual bool	begin (AudioInfo info) override
virtual void	clearNotifyAudioChange ()
	Deletes all change notify subscriptions.
void	end () override
	ends the processing
bool	isHeader (MP4Atom *atom, const uint8_t *data)
	Checks if the indicated atom is a header atom: you can define your custom method with setIsHeaderCallback()
bool	isNotifyActive ()
	Checks if the automatic AudioInfo update is active.
int	maxSize ()
	Provides the maximum size.
	operator bool () override
virtual bool	removeNotifyAudioChange (AudioInfoSupport &bi)
	Removes a target in order not to be notified about audio changes.
virtual void	setAudioInfo (AudioInfo from) override
	for most decoders this is not needed
void	setDataCallback (void(*cb)(MP4Atom &atom, ContainerMP4 &container))
	Defines the callback that is executed on each atom.
void	setIsHeaderCallback (bool(*cb)(MP4Atom *atom, const uint8_t *data))
	Defines the callback which is used to determine if an atom is a header atom.
void	setMaxSize (int size)
	Defines the maximum size that we can submit to the decoder.
void	setNotifyActive (bool flag)
	Deactivate/Reactivate automatic AudioInfo updates: (default is active)
virtual void	setOutput (AudioOutput &out_stream)
	Defines where the decoded result is written to.
virtual void	setOutput (AudioStream &out_stream)
	Defines where the decoded result is written to.
virtual void	setOutput (Print &out_stream) override
	Defines where the decoded result is written to.
const char *	streamAtom ()
	Provides the content atom name which will be written incrementally.
size_t	write (const uint8_t *data, size_t len) override
	writes the data to be parsed into atoms

Public Attributes
int	id
	custom id to be used by application

Protected Member Functions
size_t	decode (const uint8_t *data, size_t len)
	output of audio mdat to helix decoder;
void	notifyAudioChange (AudioInfo info)
void	setStreamOutputSize (int size)
	Defines the size of open data that will be written directly w/o parsing.
void	writeBlocking (Print *out, uint8_t *data, size_t len)

Static Protected Member Functions
static void	default_data_callback (MP4Atom &atom, ContainerMP4 &container)
	Default logic to process an atom. More...
static bool	default_is_header_callback (MP4Atom *atom, const uint8_t *data)
	Default logic to determine if a atom is a header.

Protected Attributes
AACDecoderHelix	aac_decoder
MP4ParseBuffer	buffer {this}
const char *	current_atom = nullptr
int	current_pos = 0
void(*	data_callback )(MP4Atom &atom, ContainerMP4 &container)=default_data_callback
AudioInfo	info
bool	is_active = false
bool(*	is_header_callback )(MP4Atom *atom, const uint8_t *data)=default_is_header_callback
bool	is_notify_active = true
bool	is_sound = false
int	max_size
Vector< AudioInfoSupport * >	notify_vector
AudioDecoder *	p_decoder = &aac_decoder
Print *	p_print = nullptr
const char *	stream_atom
int	stream_out_open = 0

Friends
class	MP4ParseBuffer

Detailed Description

Minimum flexible parser for MPEG4 data (which is based on the Quicktime format). Small atoms will be make available via a callback method. The big (audio) content is written to the Print object which was specified in the constructor. Depends on https://github.com/pschatzmann/arduino-libhelix!

Author

Phil Schatzmann

Copyright

GPLv3

Member Function Documentation

default_data_callback()

static void default_data_callback ( MP4Atom &  atom, ContainerMP4 &  container  )

inlinestaticprotected

Default logic to process an atom.

output of mdat to decoder;

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The documentation for this class was generated from the following file:

• src/AudioTools/AudioCodecs/ContainerMP4.h