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SoundFileReaderOgg.cpp
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SoundFileReaderOgg.cpp
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////////////////////////////////////////////////////////////
//
// SFML - Simple and Fast Multimedia Library
// Copyright (C) 2007-2024 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/SoundFileReaderOgg.hpp>
#include <SFML/System/Err.hpp>
#include <SFML/System/InputStream.hpp>
#include <ostream>
#include <cassert>
#include <cstdio>
namespace
{
std::size_t read(void* ptr, std::size_t size, std::size_t nmemb, void* data)
{
auto* stream = static_cast<sf::InputStream*>(data);
return static_cast<std::size_t>(stream->read(ptr, static_cast<std::int64_t>(size * nmemb)));
}
int seek(void* data, ogg_int64_t offset, int whence)
{
auto* stream = static_cast<sf::InputStream*>(data);
switch (whence)
{
case SEEK_SET:
break;
case SEEK_CUR:
offset += stream->tell();
break;
case SEEK_END:
offset = stream->getSize() - offset;
}
return static_cast<int>(stream->seek(offset));
}
long tell(void* data)
{
auto* stream = static_cast<sf::InputStream*>(data);
return static_cast<long>(stream->tell());
}
ov_callbacks callbacks = {&read, &seek, nullptr, &tell};
} // namespace
namespace sf::priv
{
////////////////////////////////////////////////////////////
bool SoundFileReaderOgg::check(InputStream& stream)
{
OggVorbis_File file;
if (ov_test_callbacks(&stream, &file, nullptr, 0, callbacks) == 0)
{
ov_clear(&file);
return true;
}
else
{
return false;
}
}
////////////////////////////////////////////////////////////
SoundFileReaderOgg::~SoundFileReaderOgg()
{
close();
}
////////////////////////////////////////////////////////////
std::optional<SoundFileReader::Info> SoundFileReaderOgg::open(InputStream& stream)
{
// Open the Vorbis stream
const int status = ov_open_callbacks(&stream, &m_vorbis, nullptr, 0, callbacks);
if (status < 0)
{
err() << "Failed to open Vorbis file for reading" << std::endl;
return std::nullopt;
}
// Retrieve the music attributes
vorbis_info* vorbisInfo = ov_info(&m_vorbis, -1);
Info info;
info.channelCount = static_cast<unsigned int>(vorbisInfo->channels);
info.sampleRate = static_cast<unsigned int>(vorbisInfo->rate);
info.sampleCount = static_cast<std::size_t>(ov_pcm_total(&m_vorbis, -1) * vorbisInfo->channels);
// For Vorbis channel mapping refer to: https://xiph.org/vorbis/doc/Vorbis_I_spec.html#x1-810004.3.9
switch (info.channelCount)
{
case 0:
err() << "No channels in Vorbis file" << std::endl;
break;
case 1:
info.channelMap = {SoundChannel::Mono};
break;
case 2:
info.channelMap = {SoundChannel::FrontLeft, SoundChannel::FrontRight};
break;
case 3:
info.channelMap = {SoundChannel::FrontLeft, SoundChannel::FrontCenter, SoundChannel::FrontRight};
break;
case 4:
info.channelMap = {SoundChannel::FrontLeft, SoundChannel::FrontRight, SoundChannel::BackLeft, SoundChannel::BackRight};
break;
case 5:
info.channelMap = {SoundChannel::FrontLeft,
SoundChannel::FrontCenter,
SoundChannel::FrontRight,
SoundChannel::BackLeft,
SoundChannel::BackRight};
break;
case 6:
info.channelMap = {SoundChannel::FrontLeft,
SoundChannel::FrontCenter,
SoundChannel::FrontRight,
SoundChannel::BackLeft,
SoundChannel::BackRight,
SoundChannel::LowFrequencyEffects};
break;
case 7:
info.channelMap = {SoundChannel::FrontLeft,
SoundChannel::FrontCenter,
SoundChannel::FrontRight,
SoundChannel::SideLeft,
SoundChannel::SideRight,
SoundChannel::BackCenter,
SoundChannel::LowFrequencyEffects};
break;
case 8:
info.channelMap = {SoundChannel::FrontLeft,
SoundChannel::FrontCenter,
SoundChannel::FrontRight,
SoundChannel::SideLeft,
SoundChannel::SideRight,
SoundChannel::BackLeft,
SoundChannel::BackRight,
SoundChannel::LowFrequencyEffects};
break;
default:
err() << "Vorbis files with more than 8 channels not supported" << std::endl;
assert(false);
break;
}
// We must keep the channel count for the seek function
m_channelCount = info.channelCount;
return info;
}
////////////////////////////////////////////////////////////
void SoundFileReaderOgg::seek(std::uint64_t sampleOffset)
{
assert(m_vorbis.datasource && "Vorbis datasource is missing. Call SoundFileReaderOgg::open() to initialize it.");
ov_pcm_seek(&m_vorbis, static_cast<ogg_int64_t>(sampleOffset / m_channelCount));
}
////////////////////////////////////////////////////////////
std::uint64_t SoundFileReaderOgg::read(std::int16_t* samples, std::uint64_t maxCount)
{
assert(m_vorbis.datasource && "Vorbis datasource is missing. Call SoundFileReaderOgg::open() to initialize it.");
// Try to read the requested number of samples, stop only on error or end of file
std::uint64_t count = 0;
while (count < maxCount)
{
const int bytesToRead = static_cast<int>(maxCount - count) * static_cast<int>(sizeof(std::int16_t));
const long bytesRead = ov_read(&m_vorbis, reinterpret_cast<char*>(samples), bytesToRead, 0, 2, 1, nullptr);
if (bytesRead > 0)
{
const long samplesRead = bytesRead / static_cast<long>(sizeof(std::int16_t));
count += static_cast<std::uint64_t>(samplesRead);
samples += samplesRead;
}
else
{
// error or end of file
break;
}
}
return count;
}
////////////////////////////////////////////////////////////
void SoundFileReaderOgg::close()
{
if (m_vorbis.datasource)
{
ov_clear(&m_vorbis);
m_vorbis.datasource = nullptr;
m_channelCount = 0;
}
}
} // namespace sf::priv