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