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mpeg.cpp File Reference

#include <stdio.h>
#include <string.h>
#include <assert.h>
#include "mpeg.h"

Go to the source code of this file.

Functions
bool	MPEG_CheckHeader (unsigned long header)
	Do a quick validity check on a MPEG Header.
bool	MPEG_FindHeader (char *buffer, unsigned buflen, int numHeads)
	Search for valid headers inside a buffer.
bool	MPEG_ParseHeader (unsigned long header, FrameInfo *info)
	Decode a MPEG Header into a more friendy format.
char *	MPEG_HeaderToString (unsigned long header)

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Function Documentation

bool MPEG_CheckHeader (  unsigned long    header )

Do a quick validity check on a MPEG Header. Note: a check for bitrate==0 was added, because we can't calculate the framelength for free form streams. Parameters: header  pointer to header to check Returns: true if it could be a valid header, or false if not. Definition at line 33 of file mpeg.cpp. Referenced by MPEG_ParseHeader().

bool MPEG_FindHeader (  char *    buffer, unsigned    buflen, int    numHeads )

Search for valid headers inside a buffer. (Presumably by using REP_SCASB, and a call to CheckHeader(). After a possible header (0xff) has been found, the frame length should be calculated, and the numHead following frames should be checked as well. If we've found e.g. 3 valid headers in a row, we can be reasonably sure that we're sync'd. \TODO implement this function! Definition at line 61 of file mpeg.cpp.

char* MPEG_HeaderToString (  unsigned long    header )

Definition at line 136 of file mpeg.cpp. References FrameInfo::bitrate, FrameInfo::crc, FrameInfo::frequency, FrameInfo::id, FrameInfo::layer, FrameInfo::mode, and MPEG_ParseHeader().

bool MPEG_ParseHeader (  unsigned long    header, FrameInfo *    info )

Decode a MPEG Header into a more friendy format. Parameters: header  header to parse. info  pointer to MpegInfo structure to fill out. Returns: true if successful, or false if the header was invalid Definition at line 76 of file mpeg.cpp. References FrameInfo::bitrate, FrameInfo::copyright, FrameInfo::crc, FrameInfo::emphasis, FrameInfo::extension, FrameInfo::frequency, FrameInfo::id, FrameInfo::layer, FrameInfo::length, FrameInfo::mode, MPEG_CheckHeader(), FrameInfo::original, FrameInfo::pad, and FrameInfo::priv. Referenced by MPEG_HeaderToString().

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