1 files changed, 258 insertions, 0 deletions
diff --git a/mpeglib/lib/mpegplay/mpegVideoBitWindow.cpp b/mpeglib/lib/mpegplay/mpegVideoBitWindow.cpp
new file mode 100644
index 00000000..87467a9c
--- /dev/null
+++ b/mpeglib/lib/mpegplay/mpegVideoBitWindow.cpp
@@ -0,0 +1,258 @@
+/*
+  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
+
+ */
+
+
+#include "mpegVideoBitWindow.h"
+
+#include <iostream>
+
+using namespace std;
+
+
+MpegVideoBitWindow::MpegVideoBitWindow() {
+  // Make buffer length multiple of 4. 
+  
+  this->size=80000;
+
+
+
+  if ((size % 4) != 0) {
+    cout << "MpegVideoStream not multiple of 4"<<endl;
+    exit(-1);
+  }
+
+  /* Create MpegVideoStream. */
+  buf_start = (unsigned int*) malloc (sizeof(unsigned int)*(size*4));
+  
+  /*
+   * Set max_buf_length to one less than actual length to deal with messy
+   * data without proper seq. end codes.
+   */
+  max_buf_length=size-1;
+
+  
+  /* Initialize bitstream i/o fields. */
+
+  bit_offset = 0;
+  buffer = buf_start;
+  buf_length = 0;
+  num_left=0;
+  leftover_bytes=0;
+  curBits = 0;
+
+
+
+
+  nBitMask[0] = 0x00000000;
+  nBitMask[1] = 0x80000000;
+  nBitMask[2] = 0xc0000000;
+  nBitMask[3] = 0xe0000000;
+  nBitMask[4] = 0xf0000000;
+  nBitMask[5] = 0xf8000000;
+  nBitMask[6] = 0xfc000000;
+  nBitMask[7] = 0xfe000000;
+  nBitMask[8] = 0xff000000;
+  nBitMask[9] = 0xff800000;
+  nBitMask[10] = 0xffc00000;
+  nBitMask[11] = 0xffe00000;
+  nBitMask[12] = 0xfff00000;
+  nBitMask[13] = 0xfff80000;
+  nBitMask[14] = 0xfffc0000;
+  nBitMask[15] = 0xfffe0000;
+  nBitMask[16] = 0xffff0000;
+  nBitMask[17] = 0xffff8000;
+  nBitMask[18] = 0xffffc000;
+  nBitMask[19] = 0xffffe000;
+  nBitMask[20] = 0xfffff000;
+  nBitMask[21] = 0xfffff800;
+  nBitMask[22] = 0xfffffc00;
+  nBitMask[23] = 0xfffffe00;
+  nBitMask[24] = 0xffffff00;
+  nBitMask[25] = 0xffffff80;
+  nBitMask[26] = 0xffffffc0;
+  nBitMask[27] = 0xffffffe0;
+  nBitMask[28] = 0xfffffff0;
+  nBitMask[29] = 0xfffffff8;
+  nBitMask[30] = 0xfffffffc;
+  nBitMask[31] = 0xfffffffe;
+  nBitMask[32] = 0xffffffff;
+
+
+}
+
+
+MpegVideoBitWindow::~MpegVideoBitWindow() {
+  delete buf_start;
+}
+
+
+
+int MpegVideoBitWindow::appendToBuffer(unsigned char* ptr,int len) {
+  int byte_length = getLength()*4;
+
+
+  resizeBuffer(len);
+  
+  if (num_left != 0) {
+    byte_length += num_left;
+    *(buffer+buf_length)=leftover_bytes;
+  }
+  memcpy(((unsigned char *)buffer)+byte_length,ptr,len);
+  
+  if ((unsigned long int)1 != ntohl(1)) {
+    unsigned int *mark = buffer+buf_length;
+    int i;
+    int n=(len+num_left)&0xfffffffc;
+    for (i=0; i < n; i+=4) {
+      *mark=ntohl(*mark);
+      mark++;
+    }
+  }
+  byte_length = byte_length + len;
+  num_left = byte_length % 4;
+  buf_length = byte_length / 4;
+  updateCurBits();
+  
+  leftover_bytes = *(buffer +buf_length);
+  return true;
+}
+
+int MpegVideoBitWindow::getLinearFree() {
+  unsigned int* endPos=buf_start+size;
+  unsigned int* currPos=buffer+buf_length;
+  
+  int back=endPos-currPos;
+  return back;
+}
+
+
+
+
+
+void MpegVideoBitWindow::flushByteOffset() {
+  int byteoff;
+
+  byteoff = bit_offset % 8;
+
+  if (byteoff != 0) {
+    flushBitsDirect((8-byteoff));
+  }
+}
+
+
+void MpegVideoBitWindow::appendToBuffer(unsigned int startCode) {
+  unsigned int startCodeRaw=htonl(startCode);
+  resizeBuffer(4);
+  appendToBuffer((unsigned char*)&startCodeRaw,4);
+}
+
+
+void MpegVideoBitWindow::clear() {
+  buffer = buf_start;
+  buf_length = 0;
+  bit_offset = 0;
+  curBits = 0;
+}
+
+
+int MpegVideoBitWindow::getLength() {
+  return buf_length;
+}
+
+
+
+
+
+
+
+void MpegVideoBitWindow::printChar(int bytes) {
+  int i;
+  unsigned char* mark;
+
+  mark=(unsigned char *)buffer;
+
+  for(i=0;i<bytes;i++) {
+    printf("i:%d read=%x\n",i,mark[i]);
+  }
+  printf("*********\n");
+
+}
+
+
+void MpegVideoBitWindow::printInt(int bytes) {
+  int i;
+  int n;
+  unsigned int* mark;
+  
+  mark=(unsigned int*)buf_start;
+
+  n=bytes/sizeof(int);
+  for(i=0;i<n;i++) {
+    printf("i:%d read=%x\n",i,mark[i]);
+  }
+  printf("*********\n");
+
+}
+
+
+void MpegVideoBitWindow::print() {
+  int byte_length = getLength()*4;
+
+  printf("bit_offset:%x\n",bit_offset);
+  printf("num_left:%x\n",num_left);
+  printf("leftover_bytes:%x\n",leftover_bytes);
+  printf("buf_length:%x\n",buf_length);
+  printf("curBits:%x\n",curBits);
+  printf("pos:%8x\n",byte_length);
+  printChar(8);
+}
+
+
+void MpegVideoBitWindow::resizeBuffer(int insertBytes) {
+  /* Read all the headers, now make room for packet */
+  if (buf_start+max_buf_length < buffer+insertBytes/4+buf_length) {
+
+    if (max_buf_length - buf_length < (int) insertBytes/4) {
+
+      /* Buffer too small for a packet (plus whats there), 
+       * time to enlarge it! 
+       */
+
+      unsigned int *old = buf_start;
+      max_buf_length=buf_length+insertBytes/4+1;
+
+      buf_start=(unsigned int*) malloc(sizeof(unsigned int)*max_buf_length);
+      if (buf_start == NULL) {
+	cout << "allocation of:"<<max_buf_length<<" bytes failed"<<endl;
+	exit(0);
+      }
+      memcpy((unsigned char *)buf_start,buffer,(unsigned int)buf_length*4);
+      delete old;
+      buffer = buf_start;
+      cout << "enlarge buffer-1 end***********"<<endl;
+
+    } else {
+      memcpy((unsigned char *)buf_start,
+	     buffer, (unsigned int) buf_length*4);
+      buffer = buf_start;
+    }
+  }
+}
+
+
+void MpegVideoBitWindow::fillWithIsoEndCode(int bytes) {
+  int i;
+  int n=bytes/4;
+  for (i=0;i<n;i++) {
+    appendToBuffer(ISO_11172_END_CODE);
+  }
+}