annexb.c File Reference

Annex B Byte Stream format. More...

#include "global.h"
#include "annexb.h"
#include "memalloc.h"

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Functions
void	malloc_annex_b (ImageParameters *p_Img)
void	init_annex_b (ANNEXB_t *annex_b)
void	free_annex_b (ImageParameters *p_Img)
static int	getChunk (ANNEXB_t *annex_b)
static byte	getfbyte (ANNEXB_t *annex_b)
static int	FindStartCode (unsigned char *Buf, int zeros_in_startcode)
int	GetAnnexbNALU (ImageParameters *p_Img, NALU_t *nalu)
void	OpenAnnexBFile (ImageParameters *p_Img, char *fn)
void	CloseAnnexBFile (ImageParameters *p_Img)
Variables
static const unsigned int	IOBUFFERSIZE = 65536

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Detailed Description

Annex B Byte Stream format.

Author:

Main contributors (see contributors.h for copyright, address and affiliation details)

• Stephan Wenger <stewe@cs.tu-berlin.de>

Definition in file annexb.c.

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Function Documentation

void CloseAnnexBFile

(

ImageParameters *

p_Img

)

Closes the bit stream file.

Definition at line 338 of file annexb.c.

Referenced by initBitsFile().

static int FindStartCode	(	unsigned char *	Buf,
		int	zeros_in_startcode
	)			[inline, static]

returns if new start code is found at byte aligned position buf. new-startcode is of form N 0x00 bytes, followed by a 0x01 byte.

Returns:

1 if start-code is found or
0, indicating that there is no start code

Parameters:

	Buf	pointer to byte-stream
	zeros_in_startcode	indicates number of 0x00 bytes in start-code.

Definition at line 102 of file annexb.c.

Referenced by GetAnnexbNALU().

int GetAnnexbNALU	(	ImageParameters *	p_Img,
		NALU_t *	nalu
	)

Returns the size of the NALU (bits between start codes in case of Annex B. nalu->buf and nalu->len are filled. Other field in nalu-> remain uninitialized (will be taken care of by NALUtoRBSP.

Returns:

0 if there is nothing any more to read (EOF) -1 in case of any error

Note:

Side-effect: Returns length of start-code in bytes.

GetAnnexbNALU expects start codes at byte aligned positions in the file

Definition at line 139 of file annexb.c.

References nalu_t::buf, FindStartCode(), nalu_t::forbidden_bit, getfbyte(), nalu_t::len, nalu_t::lost_packets, nalu_t::max_size, nalu_t::nal_reference_idc, nalu_t::nal_unit_type, no_mem_exit(), and nalu_t::startcodeprefix_len.

Referenced by initBitsFile().

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static int getChunk

(

ANNEXB_t *

annex_b

)

[inline, static]

fill IO buffer

Definition at line 53 of file annexb.c.

Referenced by getfbyte(), and OpenAnnexBFile().

static byte getfbyte

(

ANNEXB_t *

annex_b

)

[inline, static]

returns a byte from IO buffer

Definition at line 74 of file annexb.c.

References getChunk().

Referenced by GetAnnexbNALU().

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void OpenAnnexBFile	(	ImageParameters *	p_Img,
		char *	fn
	)

Opens the bit stream file named fn.

Returns:

none

Definition at line 310 of file annexb.c.

References error(), errortext, ET_SIZE, and getChunk().

Referenced by initBitsFile().

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