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/*
bitwindow mpeg video
Copyright (C) 2000 Martin Vogt
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Library General Public License as published by
the Free Software Foundation.
For more information look at the file COPYRIGHT in this package
*/
#ifndef __MPEGVIDEOBITWINDOW_H
#define __MPEGVIDEOBITWINDOW_H
#include "../input/inputPlugin.h"
#define ISO_11172_END_CODE ((unsigned int)0x000001b9)
class MpegVideoBitWindow {
int size; /* size of buffer */
unsigned int bit_offset; /* Bit offset in stream. */
unsigned int *buffer; /* Pointer to next byte in buffer */
int buf_length; /* Length of remaining buffer.*/
unsigned int *buf_start; /* Pointer to buffer start. */
int max_buf_length; /* Max length of buffer. */
unsigned int num_left; /* from ReadPacket - leftover */
unsigned int leftover_bytes; /* from ReadPacket - leftover */
unsigned int curBits; /* current bits */
unsigned int nBitMask[33];
public:
MpegVideoBitWindow();
~MpegVideoBitWindow();
int appendToBuffer(unsigned char* ptr,int len);
int getLinearFree();
// true if feof() is true and the buffer is emtpy
int isEof();
void flushByteOffset();
void appendToBuffer(unsigned int startCode);
inline void updateCurBits() {
curBits = *buffer << bit_offset;
}
inline unsigned int showBits(int bits) {
unsigned int tqmask=nBitMask[bits];
int shift=32-(bits);
int bO;
shift=(curBits & tqmask)>>shift;
bO = bit_offset + bits;
if (bO > 32) {
return (shift | (*(buffer+1)>>(64-bO)));
}
return shift;
}
inline unsigned int showBits32() {
if (bit_offset) {
return (curBits | (*(buffer+1) >> (32 - bit_offset)));
}
return curBits;
}
inline void flushBitsDirect(unsigned int bits) {
bit_offset += bits;
if (bit_offset & 0x20) {
bit_offset -= 32;
bit_offset &= 0x1f;
buffer++;
updateCurBits();
buf_length--;
}
else {
curBits <<= bits;
}
}
inline unsigned int getBits(int bits) {
unsigned int result=showBits(bits);
flushBitsDirect(bits);
return result;
}
void clear();
int getLength();
int hasBytes(int bytes);
void printChar(int bytes);
void printInt(int bytes);
void print();
void resizeBuffer(int insertBytes);
void fillWithIsoEndCode(int bytes);
};
#endif
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