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/* Copyright (C) 2025 Wildfire Games.
* This file is part of 0 A.D.
*
* 0 A.D. is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* 0 A.D. is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
*/
#include "precompiled.h"
#include "OggData.h"
#if CONFIG2_AUDIO
#include "lib/status.h"
#include "lib/types.h"
#include "ps/CLogger.h"
#include "ps/Filesystem.h"
#include "soundmanager/SoundManager.h"
#include "soundmanager/data/ogg.h"
#include <algorithm>
#include <cstddef>
#include <span>
#include <vector>
/*
* Each buffer holds ~0.56 seconds of audio.
* Bytes per second = sampleRate × channels × bytesPerSample.
* For 44100 Hz, 2 channels, 2 bytes per sample, this is 176400 bytes per second.
* Nice multiple of 4096 (system page size)
*/
constexpr int OGG_DEFAULT_BUFFER_SIZE = 98304;
COggData::COggData()
: m_Format(0), m_Frequency(0), m_OneShot(false), m_BuffersCount(0)
{
}
COggData::~COggData()
{
AL_CHECK;
if (m_BuffersCount > 0)
alDeleteBuffers(m_BuffersCount, &m_Buffer.at(0));
AL_CHECK;
m_BuffersCount = 0;
}
void COggData::SetFormatAndFreq(ALenum form, ALsizei freq)
{
m_Format = form;
m_Frequency = freq;
}
bool COggData::IsStereo()
{
return m_Format == AL_FORMAT_STEREO16;
}
bool COggData::InitOggFile(const VfsPath& itemPath)
{
if (OpenOggNonstream(g_VFS, itemPath, m_Stream) != INFO::OK)
return false;
m_FileFinished = false;
SetFormatAndFreq(m_Stream->Format(), m_Stream->SamplingRate());
SetFileName(itemPath);
AL_CHECK;
alGenBuffers(m_Buffer.size(), m_Buffer.data());
ALenum err{alGetError()};
if (err != AL_NO_ERROR)
{
LOGERROR("Failed to create initial buffer. OpenAL error: %s\n", alGetString(err));
return false;
}
m_BuffersCount = FetchDataIntoBuffer(m_Buffer.size(), m_Buffer.data());
if (m_FileFinished)
{
m_OneShot = true;
if (m_BuffersCount < OGG_DEFAULT_BUFFER_COUNT)
alDeleteBuffers(OGG_DEFAULT_BUFFER_COUNT - m_BuffersCount, &m_Buffer.at(m_BuffersCount));
}
AL_CHECK;
return true;
}
ALsizei COggData::GetBufferCount()
{
return m_BuffersCount;
}
bool COggData::IsFileFinished()
{
return m_FileFinished;
}
void COggData::ResetFile()
{
m_Stream->ResetFile();
m_FileFinished = false;
}
bool COggData::IsOneShot()
{
return m_OneShot;
}
int COggData::FetchDataIntoBuffer(int count, ALuint* buffers)
{
std::vector<u8> PCMOut(OGG_DEFAULT_BUFFER_SIZE);
int buffersWritten{0};
for (int i{0}; i < count && !m_FileFinished; ++i)
{
std::fill(PCMOut.begin(), PCMOut.end(), 0);
const size_t totalRet{m_Stream->GetNextChunk(std::span<u8>(PCMOut))};
m_FileFinished = m_Stream->AtFileEOF();
if (totalRet == 0)
continue;
++buffersWritten;
alBufferData(buffers[i], m_Format, PCMOut.data(), static_cast<ALsizei>(totalRet), m_Frequency);
}
return buffersWritten;
}
ALuint COggData::GetBuffer()
{
return m_Buffer.at(0);
}
ALuint* COggData::GetBufferPtr()
{
return m_Buffer.data();
}
#endif // CONFIG2_AUDIO
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