tdemultimedia/mpeglib/lib/frame/pcmFrame.cpp

/*
  pcm frame description.
  Copyright (C) 2001  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 "pcmFrame.h"

#include <iostream>

using namespace std;

#ifndef WORDS_BIGENDIAN
// this is fast on INTEL, but maybe not work on other little
// endian machines. (are there any?)
#define convMacro(in,dtemp,tmp)                                              \
    in[0]*=SCALFACTOR;                                                       \
    dtemp = ((((65536.0 * 65536.0 * 16)+(65536.0 * 0.5))* 65536.0))+(in[0]); \
    tmp = ((*(int *)&dtemp) - 0x80000000);                                   \
    in++;                                                                    \
    if(tmp>32767) {                                                          \
      tmp=32767;                                                             \
    } else if (tmp<-32768) {                                                 \
      tmp =-0x8000;                                                          \
    }                                                                        

#else /* big endian conversion: _AIX */
static inline void convMacro(float*& in, double dtemp, int& tmp)
{
    in[0]*=SCALFACTOR;
    tmp = (int)*in;
    in++;
    if(tmp>32767) {
      tmp=32767;
    } else if (tmp<-32768) {
      tmp =-0x8000;
    }                                                                        
    tmp = ((tmp & 0xff) << 8) | ((tmp >> 8) & 0xff);
}
#endif /* _AIX */


PCMFrame::PCMFrame(int size) {
  data=new short int[size];
  len=0;
  this->size=size;
  // this format has a sampleSize of 16, signed, endian==machine
  this->sampleSize=sizeof(short int)*8;
  this->lSigned=true;
  this->lBigEndian=AUDIOFRAME_BIGENDIAN;
  setFrameType(_FRAME_AUDIO_PCM);
}


PCMFrame::~PCMFrame() {
  delete [] data;
}


void PCMFrame::putFloatData(float* left,float* right,int copyLen) {
  int destSize=0;
  if (left  != NULL) destSize++;
  if (right != NULL) destSize++;
  destSize*=copyLen;
  if ((len+destSize) > size) {
    cout << "cannot copy putFloatData L/R version . Does not fit"<<endl;
    cout << "size:"<<size<<endl;
    cout << "len:"<<len<<endl;
    cout << "destSize:"<<destSize<<endl;
    exit(0);
  }
  double dtemp; 
  int tmp;
  int i=copyLen;
  switch(getStereo()) {
  case 1:
    while(i > 0) {
      convMacro(left,dtemp,tmp);
      data[len++]=(short int)tmp;
      convMacro(right,dtemp,tmp);
      data[len++]=(short int)tmp;
      i--;
    } 
    break;
  case 0:
    if (left != NULL) {
      int i=copyLen;
      while(i > 0) {
	convMacro(left,dtemp,tmp);
	data[len++]=(short int)tmp;
	i--;
	// right channel empty
	len++;
      } 
    }
    if (right != NULL) {
      int i=copyLen;
      len=len-destSize;
      while(i > 0) {
	// select right channel
	len++;
	convMacro(right,dtemp,tmp);
	data[len++]=(short int)tmp;
	i--;
	// left channel already copied
      }  
    }
    break;
  default:
    cout << "unknown stereo value in pcmFrame"<<endl;
    exit(0);
  }
}

void PCMFrame::putFloatData(float* in,int lenCopy) {

  if ((len+lenCopy) > size) {
    cout << "cannot copy putFloatData. Does not fit"<<endl;
    exit(0);
  }
  double dtemp; 
  int tmp;
  while(lenCopy > 0) {
    convMacro(in,dtemp,tmp);
    data[len++]=(short int)tmp;
    lenCopy--;
  }

}