libavutil/fifo.h File Reference

a very simple circular buffer FIFO implementation More...

#include <stdint.h>

Go to the source code of this file.

Data Structures
struct	AVFifoBuffer
Functions
AVFifoBuffer *	av_fifo_alloc (unsigned int size)
	Initializes an AVFifoBuffer.
void	av_fifo_free (AVFifoBuffer *f)
	Frees an AVFifoBuffer.
void	av_fifo_reset (AVFifoBuffer *f)
	Resets the AVFifoBuffer to the state right after av_fifo_alloc, in particular it is emptied.
int	av_fifo_size (AVFifoBuffer *f)
	Returns the amount of data in bytes in the AVFifoBuffer, that is the amount of data you can read from it.
int	av_fifo_space (AVFifoBuffer *f)
	Returns the amount of space in bytes in the AVFifoBuffer, that is the amount of data you can write into it.
int	av_fifo_generic_read (AVFifoBuffer *f, void *dest, int buf_size, void(*func)(void *, void *, int))
	Feeds data from an AVFifoBuffer to a user-supplied callback.
int	av_fifo_generic_write (AVFifoBuffer *f, void *src, int size, int(*func)(void *, void *, int))
	Feeds data from a user-supplied callback to an AVFifoBuffer.
int	av_fifo_realloc2 (AVFifoBuffer *f, unsigned int size)
	Resizes an AVFifoBuffer.
void	av_fifo_drain (AVFifoBuffer *f, int size)
	Reads and discards the specified amount of data from an AVFifoBuffer.
static uint8_t	av_fifo_peek (AVFifoBuffer *f, int offs)

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Detailed Description

a very simple circular buffer FIFO implementation

Definition in file fifo.h.

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Function Documentation

AVFifoBuffer* av_fifo_alloc

(

unsigned int

size

)

Initializes an AVFifoBuffer.

Parameters:

size

of FIFO

Returns:

AVFifoBuffer or NULL in case of memory allocation failure

Definition at line 25 of file fifo.c.

Referenced by av_fifo_realloc2(), av_transcode(), dv_init_mux(), ff_audio_interleave_init(), mpeg_mux_init(), start_jack(), and swf_write_header().

void av_fifo_drain	(	AVFifoBuffer *	f,
		int	size
	)

Reads and discards the specified amount of data from an AVFifoBuffer.

Parameters:

	*f	AVFifoBuffer to read from
	size	amount of data to read in bytes

Definition at line 123 of file fifo.c.

Referenced by av_fifo_generic_read(), and dv_assemble_frame().

void av_fifo_free

(

AVFifoBuffer *

f

)

Frees an AVFifoBuffer.

Parameters:

*f

AVFifoBuffer to free

Definition at line 38 of file fifo.c.

Referenced by dv_delete_mux(), dv_init_mux(), ff_audio_interleave_close(), free_pkt_fifo(), mpeg_mux_end(), and swf_write_trailer().

int av_fifo_generic_read	(	AVFifoBuffer *	f,
		void *	dest,
		int	buf_size,
		void(*)(void *, void *, int)	func
	)

Feeds data from an AVFifoBuffer to a user-supplied callback.

Parameters:

	*f	AVFifoBuffer to read from
	buf_size	number of bytes to read
	*func	generic read function
	*dest	data destination

Definition at line 105 of file fifo.c.

Referenced by audio_read_packet(), av_fifo_realloc2(), do_audio_out(), ff_interleave_new_audio_packet(), flush_packet(), free_pkt_fifo(), output_packet(), process_callback(), and swf_write_video().

int av_fifo_generic_write	(	AVFifoBuffer *	f,
		void *	src,
		int	size,
		int(*)(void *, void *, int)	func
	)

Feeds data from a user-supplied callback to an AVFifoBuffer.

Parameters:

	*f	AVFifoBuffer to write to
	*src	data source; non-const since it may be used as a modifiable context by the function defined in func
	size	number of bytes to write
	*func	generic write function; the first parameter is src, the second is dest_buf, the third is dest_buf_size. func must return the number of bytes written to dest_buf, or <= 0 to indicate no more data available to write. If func is NULL, src is interpreted as a simple byte array for source data.

Returns:

the number of bytes written to the FIFO

Definition at line 82 of file fifo.c.

Referenced by do_audio_out(), dv_assemble_frame(), ff_audio_rechunk_interleave(), mpeg_mux_write_packet(), process_callback(), supply_new_packets(), and swf_write_audio().

static uint8_t av_fifo_peek	(	AVFifoBuffer *	f,
		int	offs
	)			[inline, static]

Definition at line 109 of file fifo.h.

Referenced by dv_inject_audio().

int av_fifo_realloc2	(	AVFifoBuffer *	f,
		unsigned int	size
	)

Resizes an AVFifoBuffer.

Parameters:

	*f	AVFifoBuffer to resize
	size	new AVFifoBuffer size in bytes

Returns:

<0 for failure, >=0 otherwise

Definition at line 62 of file fifo.c.

Referenced by do_audio_out(), ff_audio_rechunk_interleave(), and mpeg_mux_write_packet().

void av_fifo_reset

(

AVFifoBuffer *

f

)

Resets the AVFifoBuffer to the state right after av_fifo_alloc, in particular it is emptied.

Parameters:

*f

AVFifoBuffer to reset

Definition at line 46 of file fifo.c.

Referenced by av_fifo_alloc().

int av_fifo_size

(

AVFifoBuffer *

f

)

Returns the amount of data in bytes in the AVFifoBuffer, that is the amount of data you can read from it.

Parameters:

*f

AVFifoBuffer to read from

Returns:

size

Definition at line 52 of file fifo.c.

Referenced by av_fifo_realloc2(), av_fifo_space(), do_audio_out(), dv_assemble_frame(), ff_audio_rechunk_interleave(), ff_interleave_new_audio_packet(), flush_packet(), free_pkt_fifo(), mpeg_mux_end(), mpeg_mux_write_packet(), output_packet(), process_callback(), swf_write_audio(), and swf_write_video().

int av_fifo_space

(

AVFifoBuffer *

f

)

Returns the amount of space in bytes in the AVFifoBuffer, that is the amount of data you can write into it.

Parameters:

*f

AVFifoBuffer to write into

Returns:

size

Definition at line 57 of file fifo.c.

Referenced by process_callback(), and supply_new_packets().