OpenRCT2/src/openrct2/object/AudioSampleTable.cpp

/*****************************************************************************
 * Copyright (c) 2014-2025 OpenRCT2 developers
 *
 * For a complete list of all authors, please refer to contributors.md
 * Interested in contributing? Visit https://github.com/OpenRCT2/OpenRCT2
 *
 * OpenRCT2 is licensed under the GNU General Public License version 3.
 *****************************************************************************/

#include "AudioSampleTable.h"

#include "../Context.h"
#include "../PlatformEnvironment.h"
#include "../audio/AudioContext.h"
#include "../core/File.h"
#include "../core/Json.hpp"
#include "../core/Path.hpp"
#include "Object.h"

using namespace OpenRCT2;
using namespace OpenRCT2::Audio;

std::vector<AudioSampleTable::Entry>& AudioSampleTable::GetEntries()
{
    return _entries;
}

void AudioSampleTable::ReadFromJson(IReadObjectContext* context, const json_t& root)
{
    json_t jSamples = root["samples"];
    if (jSamples.is_array())
    {
        for (auto& jSample : jSamples)
        {
            SourceInfo sourceInfo;
            int32_t modifier{};
            if (jSample.is_string())
            {
                sourceInfo = ParseSource(jSample.get<std::string>());
            }
            else if (jSample.is_object())
            {
                auto& jSource = jSample.at("source");
                if (jSource.is_string())
                {
                    sourceInfo = ParseSource(jSource.get<std::string>());
                    if (jSample.contains("modifier"))
                    {
                        auto& jModifier = jSample.at("modifier");
                        if (jModifier.is_number())
                        {
                            modifier = jModifier.get<int32_t>();
                        }
                    }
                }
            }

            auto asset = context->GetAsset(sourceInfo.Path);
            if (!sourceInfo.SourceRange)
            {
                auto& entry = _entries.emplace_back();
                entry.Asset = asset;
                entry.Modifier = modifier;
            }
            else
            {
                Range<int32_t> r(1, 5);
                for (auto index : *sourceInfo.SourceRange)
                {
                    auto& entry = _entries.emplace_back();
                    entry.Asset = asset;
                    entry.PathIndex = index;
                    entry.Modifier = modifier;
                }
            }
        }
    }
}

void AudioSampleTable::LoadFrom(const AudioSampleTable& table, size_t sourceStartIndex, size_t length)
{
    // Ensure we stay in bounds of source table
    if (sourceStartIndex >= table._entries.size())
        return;
    length = std::min(length, table._entries.size() - sourceStartIndex);

    // Asset packs may allocate more images for an object that original, or original object may
    // not allocate any images at all.
    if (_entries.size() < length)
    {
        _entries.resize(length);
    }

    for (size_t i = 0; i < length; i++)
    {
        const auto& sourceEntry = table._entries[sourceStartIndex + i];
        if (sourceEntry.Asset)
        {
            auto stream = sourceEntry.Asset->GetStream();
            if (stream != nullptr)
            {
                auto& entry = _entries[i];
                entry.Asset = sourceEntry.Asset;
                entry.PathIndex = sourceEntry.PathIndex;
                entry.Modifier = sourceEntry.Modifier;
            }
        }
    }
}

void AudioSampleTable::Load()
{
    for (size_t i = 0; i < _entries.size(); i++)
    {
        auto& entry = _entries[i];
        if (entry.Source == nullptr)
        {
            entry.Source = LoadSample(static_cast<uint32_t>(i));
        }
    }
}

void AudioSampleTable::Unload()
{
    for (auto& entry : _entries)
    {
        if (entry.Source != nullptr)
        {
            entry.Source->Release();
            entry.Source = nullptr;
        }
    }
}

size_t AudioSampleTable::GetCount() const
{
    return _entries.size();
}

IAudioSource* AudioSampleTable::GetSample(uint32_t index) const
{
    if (index < _entries.size())
    {
        return _entries[index].Source;
    }
    return nullptr;
}

IAudioSource* AudioSampleTable::LoadSample(uint32_t index) const
{
    IAudioSource* result{};
    if (index < _entries.size())
    {
        auto& entry = _entries[index];
        if (entry.Asset)
        {
            auto stream = entry.Asset->GetStream();
            if (stream != nullptr)
            {
                auto& audioContext = GetContext()->GetAudioContext();
                if (entry.PathIndex)
                {
                    result = audioContext.CreateStreamFromCSS(std::move(stream), *entry.PathIndex);
                }
                else
                {
                    result = audioContext.CreateStreamFromWAV(std::move(stream));
                }
            }
        }
    }
    return result;
}

int32_t AudioSampleTable::GetSampleModifier(uint32_t index) const
{
    if (index < _entries.size())
    {
        return _entries[index].Modifier;
    }
    return 0;
}