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233
source/Asset/Asset_SoundPack.cpp
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233
source/Asset/Asset_SoundPack.cpp
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#include "Asset_SoundPack.h"
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Asset_SoundPack::Asset_SoundPack()
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{
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int device = -1; // 使用默认设备
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unsigned long freq = 44100; // 采样频率，PCM常用的采样率之一，可以按需调整
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// 构造NPK信息
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InitNpkList();
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// 解析audio.xml
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XmlConfig.LoadFromFile("audio.xml");
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// 初始化SDL_mixer，支持OGG格式
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// 44100: 采样率, MIX_DEFAULT_FORMAT: 音频格式, 2: 声道数(立体声), 4096: 缓冲区大小
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if (Mix_OpenAudio(44100, MIX_DEFAULT_FORMAT, 2, 8192) < 0)
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{
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SDL_LogError(0, "SDL_mixer初始化失败! Mix_Error: %s\n", Mix_GetError());
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}
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if (Mix_Init(MIX_INIT_MP3 | MIX_INIT_OGG) < 0)
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{
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SDL_LogError(0, "Mix_Init failed: %s\n", Mix_GetError());
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}
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// 分配通道
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ChannelCount = Mix_AllocateChannels(64);
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SetAllChannelVolume(0);
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}
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Asset_SoundPack::~Asset_SoundPack()
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{
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}
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void Asset_SoundPack::InitNpkList()
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{
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DIR *dir;
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struct dirent *ent;
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std::string path = "SoundPacks/";
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dir = opendir(path.c_str());
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while ((ent = readdir(dir)))
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{
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// 跳过.和..目录
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if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)
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continue;
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std::string RealPath = path + ent->d_name;
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Ifstream_NPK Fs;
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Fs.open(RealPath.c_str(), std::ios::in | std::ios::binary);
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if (Fs.is_open())
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{
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std::string Header = Fs.ReadString();
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// 如果是NPK
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if (Header == "NeoplePack_Bill")
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{
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// 读取img数量
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int ImageCount = Fs.ReadInt();
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for (int i = 0; i < ImageCount; ++i)
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{
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// 直接读取当前项的偏移、长度和路径
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auto offset = Fs.ReadUnsignedInt();
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auto length = Fs.ReadUnsignedInt();
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auto path = Fs.ReadInfo();
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// 构造 WAV 并插入映射表
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lp_arr[path] = WAV{
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offset, // offset
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length, // size
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path, // lpWavName（直接复用读取的path）
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RealPath, // lpBelongsFile
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i // img_index
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};
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}
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}
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}
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}
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closedir(dir);
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}
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void Asset_SoundPack::Reclaims()
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{
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}
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Mix_Chunk *Asset_SoundPack::GetOgg(const std::string &lpWavName)
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{
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if (map_sound.find(lpWavName) != map_sound.end())
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{
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map_sound[lpWavName].LastUseTime = SDL_GetTicks64();
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return map_sound[lpWavName].lpMusic;
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}
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// 在NPK映射表中找到
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if (lp_arr.find(lpWavName) != lp_arr.end())
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{
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WAV &wav = lp_arr[lpWavName];
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if (wav.lpBelongsFile.empty())
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return nullptr;
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Ifstream_NPK Fs;
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Fs.open(wav.lpBelongsFile.c_str(), std::ios::in | std::ios::binary);
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if (Fs.is_open())
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{
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Fs.seekg(wav.offset, std::ios::beg);
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auto buffer = Fs.ReadCustomSize(wav.size);
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SDL_RWops *rw = SDL_RWFromConstMem(buffer, wav.size);
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if (!rw)
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{
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SDL_Log("创建内存流失败: %s\n", SDL_GetError());
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Mix_CloseAudio();
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SDL_Quit();
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return nullptr;
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}
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Mix_Chunk *music = Mix_LoadWAV_RW(rw, 0);
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if (!music)
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{
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SDL_Log("加载OGG失败: %s\n", Mix_GetError());
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SDL_RWclose(rw); // 手动关闭流
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Mix_CloseAudio();
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SDL_Quit();
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return nullptr;
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}
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map_sound[lpWavName].lpMusic = music;
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map_sound[lpWavName].LastUseTime = SDL_GetTicks64();
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return music;
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}
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}
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// 去Music文件夹中寻找
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else
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{
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Mix_Chunk *music = Mix_LoadWAV(lpWavName.c_str());
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if (!music)
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{
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SDL_Log("加载OGG失败: %s\n", Mix_GetError());
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Mix_CloseAudio();
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SDL_Quit();
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return nullptr;
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}
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map_sound[lpWavName].lpMusic = music;
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map_sound[lpWavName].LastUseTime = SDL_GetTicks64();
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return music;
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}
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}
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void Asset_SoundPack::PlayAudio(const std::string Key)
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{
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std::string RealKey = Key;
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// 先判断是不是随机组 如果是随机组去里面调出真正要播放的Key
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if (XmlConfig.HasRandomGroup(Key))
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{
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auto Group = XmlConfig.GetRandomGroup(Key);
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int RandNum = rand() % 100;
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for (auto &item : Group.items)
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{
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if (RandNum <= item.prob)
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{
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RealKey = item.tag;
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}
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}
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}
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// 如果是特效音频
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if (XmlConfig.HasEffect(Key))
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{
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std::string oggPath = XmlConfig.GetEffect(Key).file_path;
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int volume = XmlConfig.GetEffect(Key).volume_adjust;
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PlayEffect(oggPath, volume);
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}
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// 如果是背景音乐
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else if (XmlConfig.HasMusic(Key))
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{
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std::string oggPath = XmlConfig.GetMusic(Key).file_path;
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PlayMusic(Key, oggPath);
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}
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else
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{
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SDL_LogError(0, "找不到音频: %s\n", Key.c_str());
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}
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}
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void Asset_SoundPack::StopAudio(const std::string Key)
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{
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StopChannel(backgroud_music_map[Key]);
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backgroud_music_map.erase(Key);
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}
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void Asset_SoundPack::PlayMusic(const std::string Key, const std::string oggpath)
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{
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auto ogg = GetOgg(oggpath);
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if (ogg)
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{
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int channel = FindFreeChannelInRange(0, 4);
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backgroud_music_map[Key] = Mix_PlayChannel(channel, ogg, -1);
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}
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}
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void Asset_SoundPack::PlayEffect(const std::string Key, int Volume)
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{
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auto ogg = GetOgg(Key);
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if (ogg)
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{
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int channel = FindFreeChannelInRange(4, ChannelCount - 1);
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Mix_VolumeChunk(ogg, Volume);
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Mix_PlayChannel(channel, ogg, 0);
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}
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}
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void Asset_SoundPack::StopChannel(int Channel)
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{
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Mix_HaltChannel(Channel); // 停止指定通道的音效
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}
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void Asset_SoundPack::SetAllChannelVolume(int Volume)
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{
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Mix_Volume(-1, Volume);
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}
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std::map<std::string, int> Asset_SoundPack::GetBackgroudMusicVector()
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{
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return backgroud_music_map;
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}
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int Asset_SoundPack::FindFreeChannelInRange(int startChannel, int endChannel)
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{
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// 遍历通道（若总通道数小于32，则只检查到最后一个通道）
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for (int channel = startChannel; channel <= endChannel; channel++)
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{
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// 检查通道是否空闲（Mix_Playing返回0表示空闲）
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if (Mix_Playing(channel) == 0)
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{
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return channel; // 返回第一个空闲通道
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}
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}
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// 若所有通道都在使用中
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return -1;
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}
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