原文链接:
https://blog.csdn.net/oyoung_2012/article/details/102696213
运行环境：Ubuntu:16.04
开发环境准备
安装libsdl2-mixer-dev
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| ~$ sudo apt install libsdl2-mixer-dev
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需要包含的头文件
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| #include <SDL2/SDL.h>
#include <SDL2/SDL_mixer.h>
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需要链接的库文件
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| set(CMAKE_CXX_FLAGS "-pthread ${CMAKE_CXX_FLAGS}")
target_link_libraries(app
SDL2
SDL2_mixer
)
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流程
-> Mix_Init
-> Mix_OpenAudio
-> Mix_LoadMUS / Mix_LoadWAV
-> Mix_PlayMusic / Mix_FadeInMusic / Mix_PlayChanel / Mix_FadeInChannel
-> Others User Operations
-> Mix_HaltMusic / Mix_FadeOutMusic / Mix_HaltChannel / Mix_FaleOutChannel
-> Mix_CloseAudio
-> Mix_Quit
钩子函数
- Mix_HookMusic: 用于设置音乐播放过程中的回调
- Mix_HookMusicFinished: 用于设置音乐播放结束时的回调
示例代码(C++11)
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| #include <SDL2/SDL.h>
#include <SDL2/SDL_mixer.h>
#include <oyoung/defer.hpp>
#include <sspdlog/sspdlog.h>
#include <csignal>
#include <functional>
static std::function<void()> on_signal;
void signal_TERM_handle(int) {
if(on_signal) on_signal();
}
int main(int,char**)
{
USE_DEFER;
on_signal = [&] {
__defer__.~Defer();
};
std::signal(SIGTERM, signal_TERM_handle);
auto n = Mix_Init(MIX_INIT_OGG | MIX_INIT_MP3 | MIX_INIT_FLAC);
if(n == 0) {
SSPD_LOG_ERROR << "[Mix_Init] Failed initialization: " << Mix_GetError();
return n;
}
SSPD_LOG_INFO << "[Mix_Init] Mix initialize successfully";
defer [=] {
SSPD_LOG_INFO << "[Mix_Quit] Mix will quit";
Mix_Quit();
};
n = Mix_OpenAudio(MIX_DEFAULT_FREQUENCY, MIX_DEFAULT_FORMAT, MIX_DEFAULT_CHANNELS, 1024);
if(n < 0) {
SSPD_LOG_ERROR << "[Mix_OpenAudio] Failed open audio: " << Mix_GetError();
return n;
}
SSPD_LOG_INFO << "[Mix_OpenAudio] Open Audio successfully";
defer [=] {
SSPD_LOG_INFO << "[Mix_CloseAudio] Mix will close audio";
Mix_CloseAudio();
};
auto music = Mix_LoadMUS("/home/oyoung/Music/8.mp3");
if(music == nullptr) {
SSPD_LOG_ERROR << "[Mix_LoadMUS] Failed load music: " << Mix_GetError();
return -1;
}
SSPD_LOG_INFO << "[Mix_LoadMUS] Load music successfully";
defer [=] {
SSPD_LOG_INFO << "[Mix_FreeMusic] Music will be free";
Mix_FreeMusic(music);
};
n = Mix_FadeInMusic(music, 0, 1000);
Mix_HookMusicFinished([] {
SSPD_LOG_INFO << "[Main] Music play finished";
});
if(n < 0) {
SSPD_LOG_ERROR << "[Mix_FadeInMusic] Failed fade in music: " << Mix_GetError();
return n;
}
SSPD_LOG_INFO << "[Mix_FadeInMusic] Music start playing";
defer [=] {
SSPD_LOG_INFO << "[Mix_FadeOutMusic] Mix will fade out music";
Mix_FadeOutMusic(1000);
};
while (Mix_PlayingMusic()) {
SDL_Delay(1000);
}
return 0;
}
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控制台输出:
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| [2019-10-23 10:30:55.443]-[info]- [Mix_Init] Mix initialize successfully (main.cc
[2019-10-23 10:30:55.458]-[info]- [Mix_OpenAudio] Open Audio successfully (main.cc
[2019-10-23 10:30:55.458]-[info]- [Mix_LoadMUS] Load music successfully (main.cc
[2019-10-23 10:30:55.458]-[info]- [Mix_FadeInMusic] Music start playing (main.cc
[2019-10-23 10:31:00.712]-[info]- [Mix_FadeOutMusic] Mix will fade out music (main.cc
[2019-10-23 10:31:00.713]-[info]- [Mix_FreeMusic] Music will be free (main.cc
[2019-10-23 10:31:01.724]-[info]- [Main] Music play finished (main.cc
[2019-10-23 10:31:01.739]-[info]- [Mix_CloseAudio] Mix will close audio (main.cc
[2019-10-23 10:31:01.755]-[info]- [Mix_Quit] Mix will quit (main.cc
|
