使用PlayFile苹果示例与OpenGL冻结OpenGL，直到播放声音结束 [英] Using PlayFile apple example with OpenGL freezes OpenGL until playing sound is over
问题描述
我正在使用C ++编写一个小应用程序，使用OpenGL的Xcode。
我试图找到一种方法来添加简单的声音到我的应用程序。我不是太成功的OpenAL（Alut不可用在Mac），不能使sfml和SDL在我的系统上工作。所以我决定尝试Apple的PlayFile示例：
I am working on a little app in C++ with Xcode which uses OpenGL. I tried to find a way to add simple sounds to my app. I was not too succesful with OpenAL (Alut is not available in Mac) and couldn't make sfml and SDL work on my system. So I decided to try Apple's PlayFile example:
我可以使用此示例播放声音。但是，当声音开始播放时，OpenGL冻结，即所有的动画停止，直到声音播放完毕。
I can play sounds using this example. However, when a sound starts playing, OpenGL freezes, namely all the animation stops until sound is done playing.
我检查了文件PlayFile.cpp并找到了这一行：
I checked the file PlayFile.cpp and found this line:
usleep ((int)(fileDuration * 1000. * 1000.));
我认为是负责冻结OpenGL。在这条线之前，我们开始播放声音。在这行之后，我们清理缓冲区。有什么办法，我可以更改代码，所以，声音开始播放，OpenGL继续其任务，一旦声音完成播放我们清理缓冲区？我尝试使用其他解决方案，如指针，在播放开始后清理，但现在我不能使任何声音的应用程序。
which I think is responsible for freezing OpenGL. Before this line, we start playing sound. After this line we clean up buffers. Is there any way that I can change the code, so that, sound starts playing, OpenGL continues its tasks, once sound is done playing we clean the buffers? I tried to use other solutions like pointers, to clean up after playing started, but now I can not make any sound out of the app.
任何建议？ >
Any suggestions?
推荐答案
好的，经过多天的研究，我发现了解决这个问题的方法。我使用pthread来创建多个线程，每个声音一个。我刚添加了
OK, after days of research I found a way to fix this problem. I used pthread to create multiple threads, one for each sound. I just added
#include <pthread.h>
到定义线程的任何文件。我为我的声音和线程定义了一个列表：
to any file that defines a thread. I defined a list for my sounds and threads:
pthread_t threads[3];
string sounds[3] = {"back.wav", "Arrow1.wav", "Arrow2.wav"};
并使用了一个简单的函数：
And used a simple function:
void * playSound(void *threadid)
{
long tid;
tid = (long)threadid;
player(sounds[tid], 1);
pthread_exit(NULL);
}
在创建主题时播放声音：
that plays a sound when I create a thread:
pthread_create(&threads[2], NULL, playSound, (void *)2);
这样我的动画可以很容易地与声音结合。
This way my animation can be combined with sound easily.
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