Week10 閻覃的上課筆記

Week10 閻覃的上課筆記試玩遊戲播放聲音檔案

試玩遊戲

最高分數是171喔

並且成功在電腦上發出了聲音

播放聲音檔案

由於老師使用的是Windows中的mmsystem.h中的PlaySound函數，我的系統並不支持，所以為了跨平台，我在Google中找到了一個支持跨平台的庫，並且做了一些封裝。這樣就可以播放wav和mp3音樂了。這個庫還可以支持同時播放多個聲音，並不會播放另一個的時候就會將原來的停止，所以彈奏鋼琴時就可以彈出和弦的聲音。也可以為遊戲配背景音樂，甚至可以調整音量大小。

FMOD下載地址：http://www.fmod.org/download/

CMakeLists.txt中配置如下：

 
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cmake_minimum_required(VERSION 3.7)
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project(05052553_week10)
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​
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -framework GLUT -framework OpenGL -framework OpenAL")
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​
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set(SOURCE_FILES main.cpp SoundPlayer.cpp SoundPlayer.h)
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link_directories(api/lowlevel/lib/)
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include_directories(api/lowlevel/inc/)
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include_directories(api/lowlevel/examples/)
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​
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add_executable(05052553_week10 ${SOURCE_FILES})
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​
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target_link_libraries(05052553_week10 fmod)
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target_link_libraries(05052553_week10 fmodL)

SoundPlayer.h

 
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//
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// Created by Ethan on 2017/5/1.
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//
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​
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#ifndef INC_05052553_WEEK10_SOUNDPLAYER_H
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#define INC_05052553_WEEK10_SOUNDPLAYER_H
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​
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#include "fmod.hpp"
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#include "fmod_errors.h"
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​
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class SoundPlayer {
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private:
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​
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    FMOD::System *system;
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​
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public:
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    SoundPlayer();
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​
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    virtual ~SoundPlayer();
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​
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    FMOD::Sound *CreateSound(const char *filePath);
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​
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    void playSound(FMOD::Sound *sound, FMOD::Channel **channel = 0);
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​
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    void setSoundVolume(FMOD::Channel *channel, float volume = 0);
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};
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​
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​
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#endif //INC_05052553_WEEK10_SOUNDPLAYER_H

SoundPlayer.cpp

 
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//
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// Created by Ethan on 2017/5/1.
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//
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​
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#include "SoundPlayer.h"
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#include <common.h>
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​
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#define ERRCHECK(_result) ERRCHECK_fn(_result, __FILE__, __LINE__)
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​
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FMOD_RESULT result;
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​
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void ERRCHECK_fn(FMOD_RESULT result, const char *file, int line) {
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    if (result != FMOD_OK) {
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        printf("%s(%d): FMOD error %d - %s\r", file, line, result, FMOD_ErrorString(result));
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        exit(1);
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    }
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}
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​
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void SoundPlayer::playSound(FMOD::Sound *sound, FMOD::Channel **channel) {
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    result = system->playSound(sound, 0, false, channel);
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    ERRCHECK(result);
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}
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​
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FMOD::Sound *SoundPlayer::CreateSound(const char *filePath) {
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    FMOD::Sound *sound = NULL;
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    result = system->createSound(filePath, FMOD_DEFAULT, 0, &sound);
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    ERRCHECK(result);
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​
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    result = sound->setMode(
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            FMOD_LOOP_OFF);    /* drumloop.wav has embedded loop points which automatically makes looping turn on, */
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    ERRCHECK(
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            result);                           /* so turn it off here.  We could have also just put FMOD_LOOP_OFF in the above CreateSound call. */
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​
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    return sound;
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}
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​
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SoundPlayer::SoundPlayer() {
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​
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    unsigned int version;
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    void *extradriverdata = 0;
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​
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    /*
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        Create a System object and initialize
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    */
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    result = FMOD::System_Create(&system);
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    ERRCHECK(result);
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​
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    result = system->getVersion(&version);
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    ERRCHECK(result);
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​
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    if (version < FMOD_VERSION) {
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        printf("FMOD lib version %08x doesn't match header version %08x", version, FMOD_VERSION);
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    }
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​
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    result = system->init(32, FMOD_INIT_NORMAL, extradriverdata);
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    ERRCHECK(result);
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​
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}
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​
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void SoundPlayer::setSoundVolume(FMOD::Channel *channel, float volume) {
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    result = channel->setVolume(volume);
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    ERRCHECK(result);
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}
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​
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SoundPlayer::~SoundPlayer() {
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    result = system->close();
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    ERRCHECK(result);
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    result = system->release();
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    ERRCHECK(result);
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}

通過封裝之後就可以方便的使用這個庫了。由於我的遊戲中聲音比較多，所以看起來程式碼會比較長，實際上只需要很短就可以。

首先定義聲音全局變數：

 
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FMOD::Sound *soundLol[6];
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FMOD::Sound *soundShot;
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FMOD::Sound *soundReload;
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FMOD::Sound *soundBgm;
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SoundPlayer *player;

然後初始化剛定義的變數：

 
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void initSounds() {
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    player = new SoundPlayer();
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​
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​
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    for (int i = 0; i < 6; i++) {
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        char str[50];
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        sprintf(str, "sounds/lol/%d.mp3", i + 1);
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        cout << str << endl;
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        soundLol[i] = player->CreateSound(str);
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    }
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​
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    soundShot = player->CreateSound("sounds/shot.mp3");
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    soundReload = player->CreateSound("sounds/reload.mp3");
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​
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    soundBgm = player->CreateSound("sounds/bgm.mp3");
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}

最後就可以播放聲音了。

 
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int main(int argc, char *argv[]) {
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​
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    initSounds();
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​
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    FMOD::Channel *channel = NULL;
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    player->playSound(soundBgm, &channel);
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    player->setSoundVolume(channel, 0.8);
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  //...

打茶壺小遊戲哦，想玩的可以找我要程式碼。