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157 lines (128 loc) · 3.38 KB
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/**********************************************************************
Audacity: A Digital Audio Editor
MultiFormatReader.cpp
Philipp Sibler
******************************************************************//**
\class MultiFormatReader
\brief MultiFormatReader reads raw audio files in different formats and
machine endianness representations.
*//*******************************************************************/
#include "MultiFormatReader.h"
#include <exception>
#include <stdexcept>
#include <cstring>
#include <stdint.h>
#include <cstdio>
#include <wx/defs.h>
MachineEndianness::MachineEndianness()
{
if (wxBYTE_ORDER == wxLITTLE_ENDIAN)
{
mFlag = MachineEndianness::Little;
}
else
{
mFlag = MachineEndianness::Big;
}
}
MultiFormatReader::MultiFormatReader(const char* filename)
: mpFid(NULL)
{
mpFid = fopen(filename, "rb");
if (mpFid == NULL)
{
throw std::runtime_error("Error opening file");
}
}
MultiFormatReader::~MultiFormatReader()
{
if (mpFid != NULL)
{
fclose(mpFid);
}
}
void MultiFormatReader::Reset()
{
if (mpFid != NULL)
{
rewind(mpFid);
}
}
size_t MultiFormatReader::ReadSamples(void* buffer, size_t len,
MultiFormatReader::FormatT format,
MachineEndianness::EndiannessT end)
{
return ReadSamples(buffer, len, 1, format, end);
}
size_t MultiFormatReader::ReadSamples(void* buffer, size_t len, size_t stride,
MultiFormatReader::FormatT format,
MachineEndianness::EndiannessT end)
{
bool swapflag = (mEnd.Which() != end);
size_t actRead=0;
switch(format)
{
case Int8:
case Uint8:
actRead = Read(buffer, 1, len, stride);
break;
case Int16:
case Uint16:
actRead = Read(buffer, 2, len, stride);
if(swapflag) SwapBytes(buffer, 2, len);
break;
case Int32:
case Uint32:
case Float:
actRead = Read(buffer, 4, len, stride);
if(swapflag) SwapBytes(buffer, 4, len);
break;
case Double:
actRead = Read(buffer, 8, len, stride);
if(swapflag) SwapBytes(buffer, 8, len);
break;
default:
break;
}
return actRead;
}
size_t MultiFormatReader::Read(void* buffer, size_t size, size_t len, size_t stride)
{
size_t actRead = 0;
uint8_t* pWork = (uint8_t*) buffer;
if (stride > 1)
{
// There are gaps between consecutive samples,
// so do a scattered read
for (size_t n = 0; n < len; n++)
{
actRead += fread(&(pWork[n*size]), size, 1, mpFid);
// FIXME: TRAP_ERR fseek return in MultiFormatReader unchecked.
fseek(mpFid, (stride - 1) * size, SEEK_CUR);
}
}
else
{
// Just do a linear read
actRead = fread(buffer, size, len, mpFid);
}
return actRead;
}
void MultiFormatReader::SwapBytes(void* buffer, size_t size, size_t len)
{
uint8_t* pResBuffer = (uint8_t*) buffer;
uint8_t* pCurBuffer;
if (size > 8)
{
throw std::runtime_error("SwapBytes Exception: Format width exceeding 8 bytes.");
}
for (size_t i = 0; i < len; i++)
{
pCurBuffer = &(pResBuffer[i*size]);
memcpy(mSwapBuffer, &(pCurBuffer[0]), size);
for (size_t n = 0; n < size; n++)
{
pCurBuffer[n] = mSwapBuffer[size - n - 1];
}
}
}