annexb.c File Reference

Annex B Byte Stream format. More...

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

Include dependency graph for annexb.c:

Go to the source code of this file.

Functions
static int	getChunk ()
static byte	getfbyte ()
static int	FindStartCode (unsigned char *Buf, int zeros_in_startcode)
int	GetAnnexbNALU (NALU_t *nalu)
void	OpenAnnexBFile (char *fn)
void	CloseAnnexBFile ()
Variables
static int	BitStreamFile = -1
static const unsigned int	IOBUFFERSIZE = 65536
static byte *	iobuffer
static byte *	iobufferread
static unsigned int	bytesinbuffer
static int	is_eof
static int	IsFirstByteStreamNALU = 1
static int	nextstartcodebytes = 0

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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

(

void

)

Closes the bit stream file.

Definition at line 320 of file annexb.c.

References BitStreamFile.

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 84 of file annexb.c.

static int getChunk

(

)

[inline, static]

fill IO buffer

Definition at line 35 of file annexb.c.

References BitStreamFile.

Referenced by getfbyte(), and OpenAnnexBFile().

static byte getfbyte

(

)

[inline, static]

returns a byte from IO buffer

Definition at line 56 of file annexb.c.

References getChunk().

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void OpenAnnexBFile

(

char *

fn

)

Opens the bit stream file named fn.

Returns:

none

Definition at line 293 of file annexb.c.

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

Referenced by initBitsFile().

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Variable Documentation

int BitStreamFile = -1 [static]

the bit stream file

Definition at line 19 of file annexb.c.

Referenced by CloseAnnexBFile(), CloseRTPFile(), getChunk(), GetRTPNALU(), OpenAnnexBFile(), and OpenRTPFile().

int nextstartcodebytes = 0 [static]

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 122 of file annexb.c.