Other

Modules
	Preprocessor String Macros
	String manipulation macros.
	Library Version Macros
	Useful to check and match library version in order to maintain backward compatibility.
	Constants
	Image related
	AVPicture types, pixel formats and basic image planes manipulation.
	Version and Build diagnostics
	Macros and function useful to check at compiletime and at runtime which version of libavutil is in use.
	Media Type
	Media Type.

Macros
#define	av_int_list_length(list, term)    av_int_list_length_for_size(sizeof(*(list)), list, term)
	Compute the length of an integer list.
#define	AV_FOURCC_MAX_STRING_SIZE   32
#define	av_fourcc2str(fourcc)   av_fourcc_make_string((char[AV_FOURCC_MAX_STRING_SIZE]){0}, fourcc)

Enumerations
enum	AVMediaType {   AVMEDIA_TYPE_UNKNOWN = -1 , AVMEDIA_TYPE_VIDEO , AVMEDIA_TYPE_AUDIO , AVMEDIA_TYPE_DATA ,   AVMEDIA_TYPE_SUBTITLE , AVMEDIA_TYPE_ATTACHMENT , AVMEDIA_TYPE_NB }

Functions
const char *	av_get_media_type_string (enum AVMediaType media_type)
	Return a string describing the media_type enum, NULL if media_type is unknown.
static void *	av_x_if_null (const void *p, const void *x)
	Return x default pointer in case p is NULL.
unsigned	av_int_list_length_for_size (unsigned elsize, const void *list, uint64_t term) av_pure
	Compute the length of an integer list.
AVRational	av_get_time_base_q (void)
	Return the fractional representation of the internal time base.
char *	av_fourcc_make_string (char *buf, uint32_t fourcc)
	Fill the provided buffer with a string containing a FourCC (four-character code) representation.

Detailed Description

Macro Definition Documentation

av_int_list_length

#define av_int_list_length	(		list,
			term
	)		av_int_list_length_for_size(sizeof(*(list)), list, term)

Compute the length of an integer list.

Parameters

term	list terminator (usually 0 or -1)
list	pointer to the list

Returns

length of the list, in elements, not counting the terminator

Definition at line 335 of file avutil.h.

AV_FOURCC_MAX_STRING_SIZE

#define AV_FOURCC_MAX_STRING_SIZE   32

Definition at line 343 of file avutil.h.

av_fourcc2str

#define av_fourcc2str

(

fourcc

)

av_fourcc_make_string((char[AV_FOURCC_MAX_STRING_SIZE]){0}, fourcc)

Definition at line 345 of file avutil.h.

Enumeration Type Documentation

AVMediaType

enum AVMediaType

Enumerator
AVMEDIA_TYPE_UNKNOWN	Usually treated as AVMEDIA_TYPE_DATA.
AVMEDIA_TYPE_VIDEO
AVMEDIA_TYPE_AUDIO
AVMEDIA_TYPE_DATA	Opaque data information usually continuous.
AVMEDIA_TYPE_SUBTITLE
AVMEDIA_TYPE_ATTACHMENT	Opaque data information usually sparse.
AVMEDIA_TYPE_NB

Definition at line 199 of file avutil.h.

Function Documentation

av_get_media_type_string()

const char * av_get_media_type_string

(

enum AVMediaType

media_type

)

Return a string describing the media_type enum, NULL if media_type is unknown.

Examples

demux_decode.c, and extract_mvs.c.

Referenced by open_codec_context(), and open_codec_context().

av_x_if_null()

static void * av_x_if_null ( const void *  p, const void *  x  )

inlinestatic

Return x default pointer in case p is NULL.

Examples

decode_filter_audio.c.

Definition at line 312 of file avutil.h.

Referenced by init_filters().

av_int_list_length_for_size()

unsigned av_int_list_length_for_size	(	unsigned	elsize,
		const void *	list,
		uint64_t	term
	)

Compute the length of an integer list.

Parameters

elsize	size in bytes of each list element (only 1, 2, 4 or 8)
term	list terminator (usually 0 or -1)
list	pointer to the list

Returns

length of the list, in elements, not counting the terminator

av_get_time_base_q()

AVRational av_get_time_base_q

(

void

)

Return the fractional representation of the internal time base.

av_fourcc_make_string()

char * av_fourcc_make_string	(	char *	buf,
		uint32_t	fourcc
	)

Fill the provided buffer with a string containing a FourCC (four-character code) representation.

Parameters

buf	a buffer with size in bytes of at least AV_FOURCC_MAX_STRING_SIZE
fourcc	the fourcc to represent

Returns

the buffer in input