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SoundFileReaderWav.cpp
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SoundFileReaderWav.cpp
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////////////////////////////////////////////////////////////
//
// SFML - Simple and Fast Multimedia Library
// Copyright (C) 2007-2021 Laurent Gomila (laurent@sfml-dev.org)
//
// This software is provided 'as-is', without any express or implied warranty.
// In no event will the authors be held liable for any damages arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it freely,
// subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented;
// you must not claim that you wrote the original software.
// If you use this software in a product, an acknowledgment
// in the product documentation would be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such,
// and must not be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////
// Headers
////////////////////////////////////////////////////////////
#include <SFML/Audio/SoundFileReaderWav.hpp>
#include <SFML/System/InputStream.hpp>
#include <SFML/System/Err.hpp>
#include <algorithm>
#include <cctype>
#include <cassert>
#include <cstring>
namespace
{
// The following functions read integers as little endian and
// return them in the host byte order
bool decode(sf::InputStream& stream, sf::Uint8& value)
{
return stream.read(&value, sizeof(value)) == sizeof(value);
}
bool decode(sf::InputStream& stream, sf::Int16& value)
{
unsigned char bytes[sizeof(value)];
if (stream.read(bytes, sizeof(bytes)) != sizeof(bytes))
return false;
value = static_cast<sf::Uint8>(bytes[0] | (bytes[1] << 8));
return true;
}
bool decode(sf::InputStream& stream, sf::Uint16& value)
{
unsigned char bytes[sizeof(value)];
if (stream.read(bytes, sizeof(bytes)) != sizeof(bytes))
return false;
value = static_cast<sf::Uint16>(bytes[0] | (bytes[1] << 8));
return true;
}
bool decode24bit(sf::InputStream& stream, sf::Uint32& value)
{
unsigned char bytes[3];
if (stream.read(bytes, sizeof(bytes)) != sizeof(bytes))
return false;
value = static_cast<sf::Uint32>(bytes[0] | (bytes[1] << 8) | (bytes[2] << 16));
return true;
}
bool decode(sf::InputStream& stream, sf::Uint32& value)
{
unsigned char bytes[sizeof(value)];
if (stream.read(bytes, sizeof(bytes)) != sizeof(bytes))
return false;
value = static_cast<sf::Uint32>(bytes[0] | (bytes[1] << 8) | (bytes[2] << 16) | (bytes[3] << 24));
return true;
}
const sf::Uint64 mainChunkSize = 12;
const sf::Uint16 waveFormatPcm = 1;
const sf::Uint16 waveFormatExtensible= 65534;
const char* waveSubformatPcm =
"\x01\x00\x00\x00\x00\x00\x10\x00"
"\x80\x00\x00\xAA\x00\x38\x9B\x71";
}
namespace sf
{
namespace priv
{
////////////////////////////////////////////////////////////
bool SoundFileReaderWav::check(InputStream& stream)
{
char header[mainChunkSize];
if (stream.read(header, sizeof(header)) < static_cast<Int64>(sizeof(header)))
return false;
return (header[0] == 'R') && (header[1] == 'I') && (header[2] == 'F') && (header[3] == 'F')
&& (header[8] == 'W') && (header[9] == 'A') && (header[10] == 'V') && (header[11] == 'E');
}
////////////////////////////////////////////////////////////
SoundFileReaderWav::SoundFileReaderWav() :
m_stream (NULL),
m_bytesPerSample(0),
m_dataStart (0),
m_dataEnd (0)
{
}
////////////////////////////////////////////////////////////
bool SoundFileReaderWav::open(InputStream& stream, Info& info)
{
m_stream = &stream;
if (!parseHeader(info))
{
err() << "Failed to open WAV sound file (invalid or unsupported file)" << std::endl;
return false;
}
return true;
}
////////////////////////////////////////////////////////////
void SoundFileReaderWav::seek(Uint64 sampleOffset)
{
assert(m_stream);
m_stream->seek(static_cast<Int64>(m_dataStart + sampleOffset * m_bytesPerSample));
}
////////////////////////////////////////////////////////////
Uint64 SoundFileReaderWav::read(Int16* samples, Uint64 maxCount)
{
assert(m_stream);
Uint64 count = 0;
Uint64 startPos = static_cast<Uint64>(m_stream->tell());
// Tracking of m_dataEnd is important to prevent sf::Music from reading
// data until EOF, as WAV files may have metadata at the end.
while ((count < maxCount) && (startPos + count * m_bytesPerSample < m_dataEnd))
{
switch (m_bytesPerSample)
{
case 1:
{
Uint8 sample = 0;
if (decode(*m_stream, sample))
*samples++ = static_cast<Int16>((static_cast<Int16>(sample) - 128) << 8);
else
return count;
break;
}
case 2:
{
Int16 sample = 0;
if (decode(*m_stream, sample))
*samples++ = sample;
else
return count;
break;
}
case 3:
{
Uint32 sample = 0;
if (decode24bit(*m_stream, sample))
*samples++ = static_cast<Int16>(sample >> 8);
else
return count;
break;
}
case 4:
{
Uint32 sample = 0;
if (decode(*m_stream, sample))
*samples++ = static_cast<Int16>(sample >> 16);
else
return count;
break;
}
default:
{
assert(false);
return 0;
}
}
++count;
}
return count;
}
////////////////////////////////////////////////////////////
bool SoundFileReaderWav::parseHeader(Info& info)
{
assert(m_stream);
// If we are here, it means that the first part of the header
// (the format) has already been checked
char mainChunk[mainChunkSize];
if (m_stream->read(mainChunk, sizeof(mainChunk)) != sizeof(mainChunk))
return false;
// Parse all the sub-chunks
bool dataChunkFound = false;
while (!dataChunkFound)
{
// Parse the sub-chunk id and size
char subChunkId[4];
if (m_stream->read(subChunkId, sizeof(subChunkId)) != sizeof(subChunkId))
return false;
Uint32 subChunkSize = 0;
if (!decode(*m_stream, subChunkSize))
return false;
Int64 subChunkStart = m_stream->tell();
if (subChunkStart == -1)
return false;
// Check which chunk it is
if ((subChunkId[0] == 'f') && (subChunkId[1] == 'm') && (subChunkId[2] == 't') && (subChunkId[3] == ' '))
{
// "fmt" chunk
// Audio format
Uint16 format = 0;
if (!decode(*m_stream, format))
return false;
if ((format != waveFormatPcm) && (format != waveFormatExtensible))
return false;
// Channel count
Uint16 channelCount = 0;
if (!decode(*m_stream, channelCount))
return false;
info.channelCount = channelCount;
// Sample rate
Uint32 sampleRate = 0;
if (!decode(*m_stream, sampleRate))
return false;
info.sampleRate = sampleRate;
// Byte rate
Uint32 byteRate = 0;
if (!decode(*m_stream, byteRate))
return false;
// Block align
Uint16 blockAlign = 0;
if (!decode(*m_stream, blockAlign))
return false;
// Bits per sample
Uint16 bitsPerSample = 0;
if (!decode(*m_stream, bitsPerSample))
return false;
if (bitsPerSample != 8 && bitsPerSample != 16 && bitsPerSample != 24 && bitsPerSample != 32)
{
err() << "Unsupported sample size: " << bitsPerSample << " bit (Supported sample sizes are 8/16/24/32 bit)" << std::endl;
return false;
}
m_bytesPerSample = bitsPerSample / 8;
if (format == waveFormatExtensible)
{
// Extension size
Uint16 extensionSize = 0;
if (!decode(*m_stream, extensionSize))
return false;
// Valid bits per sample
Uint16 validBitsPerSample = 0;
if (!decode(*m_stream, validBitsPerSample))
return false;
// Channel mask
Uint32 channelMask = 0;
if (!decode(*m_stream, channelMask))
return false;
// Subformat
char subformat[16];
if (m_stream->read(subformat, sizeof(subformat)) != sizeof(subformat))
return false;
if (std::memcmp(subformat, waveSubformatPcm, sizeof(subformat)) != 0)
{
err() << "Unsupported format: extensible format with non-PCM subformat" << std::endl;
return false;
}
if (validBitsPerSample != bitsPerSample)
{
err() << "Unsupported format: sample size (" << validBitsPerSample << " bits) and "
"sample container size (" << bitsPerSample << " bits) differ" << std::endl;
return false;
}
}
// Skip potential extra information
if (m_stream->seek(subChunkStart + subChunkSize) == -1)
return false;
}
else if ((subChunkId[0] == 'd') && (subChunkId[1] == 'a') && (subChunkId[2] == 't') && (subChunkId[3] == 'a'))
{
// "data" chunk
// Compute the total number of samples
info.sampleCount = subChunkSize / m_bytesPerSample;
// Store the start and end position of samples in the file
m_dataStart = static_cast<Uint64>(subChunkStart);
m_dataEnd = m_dataStart + info.sampleCount * m_bytesPerSample;
dataChunkFound = true;
}
else
{
// unknown chunk, skip it
if (m_stream->seek(m_stream->tell() + subChunkSize) == -1)
return false;
}
}
return true;
}
} // namespace priv
} // namespace sf