wma_common.c File Reference

Functions used by both the WMA afh and decoder. More...

#include <sys/types.h>
#include "para.h"
#include "error.h"
#include "afh.h"
#include "portable_io.h"
#include "imdct.h"
#include "wma.h"

Functions
const char *	search_pattern (const char *pattern, int pattern_len, const char *buf, int buf_size)
	Find the first occurrence of the given pattern. More...
int	read_asf_header (const char *buf, int loaded, struct asf_header_info *ahi)
	Read an asf audio file header. More...
__a_const int	wma_log2 (unsigned int v)
	Compute the base-2 logarithm. More...

Detailed Description

Functions used by both the WMA afh and decoder.

Function Documentation

search_pattern()

const char* search_pattern	(	const char *	pattern,
		int	pattern_len,
		const char *	buf,
		int	buf_size
	)

Find the first occurrence of the given pattern.

Parameters

pattern	The pattern to search for.
pattern_len	The length of the pattern in bytes.
buf	The buffer to search for the pattern.
buf_size	The number of bytes in buf.

Returns

A pointer into buf or NULL if the pattern was not found.

References PARA_DEBUG_LOG, and PARA_NOTICE_LOG.

read_asf_header()

int read_asf_header	(	const char *	buf,
		int	loaded,
		struct asf_header_info *	ahi
	)

Read an asf audio file header.

Parameters

buf	The input buffer.
loaded	Number of bytes in buf.
ahi	Result pointer.

Returns

Negative on errors, zero if more data is needed in order to read the full header, 1 on success.

References asf_header_info::header_len.

wma_log2()

__a_const int wma_log2

(

unsigned int

v

)

Compute the base-2 logarithm.

Parameters

v	The value to compute the logarithm of.

Returns

An integer approximation of log2(v).