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#include "WaveFile.h"
#include <fstream>
#include <iostream>
#include <cstdint>
#include <cassert>
#include <cstring>
namespace
{
struct RIFFChunk
{
std::uint32_t chunkID;
std::uint32_t chunkSize;
std::uint32_t format;
};
struct fmtChunk
{
std::uint32_t chunkID;
std::uint32_t chunkSize;
std::uint16_t audioFormat;
std::uint16_t numChannels;
std::uint32_t sampleRate;
std::uint32_t byteRate;
std::uint16_t blockAlign;
std::uint16_t bitsPerSample;
};
struct WaveHeader
{
RIFFChunk riff;
fmtChunk fmt;
};
}
WaveFile::WaveFile() : data(nullptr), size(0)
{
}
WaveFile::WaveFile(const std::string &filename) : data(nullptr), size(0)
{
Load(filename);
}
WaveFile::~WaveFile()
{
Unload();
}
bool WaveFile::Load(const std::string &filename)
{
if (IsLoaded())
{
Unload();
}
std::fstream file(filename, std::ios::in | std::ios::binary);
if (!file.is_open())
{
std::cerr << "Error: Could not open file." << std::endl;
return false;
}
WaveHeader header;
std::memset(&header, 0, sizeof(WaveHeader));
while (file.peek() != std::char_traits<char>::eof())
{
std::uint32_t chunkID;
std::uint32_t chunkSize;
file.read(reinterpret_cast<char*>(&chunkID), sizeof(std::uint32_t));
file.read(reinterpret_cast<char*>(&chunkSize), sizeof(std::uint32_t));
switch (chunkID)
{
case 'FFIR':
{
header.riff.chunkID = chunkID;
header.riff.chunkSize = chunkSize;
file.read(reinterpret_cast<char*>(&header.riff.format), sizeof(std::uint32_t));
if (header.riff.format != 'EVAW')
{
std::cerr << "Error: Not a valid WAVE file." << std::endl;
return false;
}
break;
}
case ' tmf':
{
header.fmt.chunkID = chunkID;
header.fmt.chunkSize = chunkSize;
file.read(reinterpret_cast<char*>(&header.fmt.audioFormat), sizeof(std::uint16_t));
file.read(reinterpret_cast<char*>(&header.fmt.numChannels), sizeof(std::uint16_t));
file.read(reinterpret_cast<char*>(&header.fmt.sampleRate), sizeof(std::uint32_t));
file.read(reinterpret_cast<char*>(&header.fmt.byteRate), sizeof(std::uint32_t));
file.read(reinterpret_cast<char*>(&header.fmt.blockAlign), sizeof(std::uint16_t));
file.read(reinterpret_cast<char*>(&header.fmt.bitsPerSample), sizeof(std::uint16_t));
if (header.fmt.audioFormat != PCM &&
header.fmt.audioFormat != WAVE_FORMAT_IEEE_FLOAT)
{
std::cerr << "Error: Not in valid format" << std::endl;
return false;
}
if (header.fmt.bitsPerSample % 2 != 0)
{
std::cerr << "Error: Invalid number of bits per sample" << std::endl;
return false;
}
if (header.fmt.byteRate != (header.fmt.sampleRate * header.fmt.numChannels * header.fmt.bitsPerSample / 8))
{
std::cerr << "Error: Invalid byte rate" << std::endl;
return false;
}
if (header.fmt.blockAlign != (header.fmt.numChannels * header.fmt.bitsPerSample / 8))
{
std::cerr << "Error: Invalid block align" << std::endl;
return false;
}
break;
}
case 'atad':
{
assert(data == nullptr);
size = chunkSize;
data = new char[size];
file.read(data, chunkSize);
break;
}
default:
{
file.ignore(chunkSize);
break;
}
}
}
// Check that we got all chunks
if (header.riff.chunkID != 'FFIR')
{
std::cerr << "Error: Missing RIFF chunk." << std::endl;
return false;
}
if (header.fmt.chunkID != ' tmf')
{
std::cerr << "Error: Missing fmt chunk." << std::endl;
return false;
}
if (data == nullptr || size == 0)
{
std::cerr << "Error: Missing data chunk." << std::endl;
return false;
}
// Fill meta struct
meta.audioFormat = static_cast<AudioFormat>(header.fmt.audioFormat);
meta.numChannels = header.fmt.numChannels;
meta.sampleRate = header.fmt.sampleRate;
meta.bitsPerSample = header.fmt.bitsPerSample;
return true;
}
void WaveFile::Unload()
{
delete[] data;
data = nullptr;
size = 0;
}
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