OpenAL初始化问题，仅iPod(?) [英] OpenAL initialization problem, iPod only (?)

问题描述

我在OpenAL中遇到的问题似乎只在iPod硬件上才发生，奇怪的是，它正常正常工作，而现在却没有.

I'm having a problem with OpenAL that only seems to occur with iPod hardware, and the odd thing is that it was working fine, and now it's not.

我正在设置音频会话:

[[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryPlayAndRecord error: nil];
UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker;
AudioSessionSetProperty(kAudioSessionProperty_OverrideAudioRoute, 
sizeof(UInt32), &audioRouteOverride);

AudioSessionSetActive(YES);

并初始化OpenAL:

And initializing OpenAL:

device = alcOpenDevice(NULL);
if (!device) {
    NSLog(@"Could not open default OpenAL device.");
    return NO;
}

context = alcCreateContext(device, 0);
if (!context) {
    NSLog(@"Failed to create OpenAL context for default device.");
    return NO;
}

BOOL success = alcMakeContextCurrent(context);  // fails here
if (!success) {
    NSLog(@"Failed to set current OpenAL context.");
    return NO;

输出为:

AudioStreamBasicDescription:  2 ch,  44100 Hz, 'lpcm' (0x00000C2C) 8.24-bit little-endian signed integer, deinterleaved
2010-10-27 10:51:09.261 FinchTestProject[239:307] Failed to set current OpenAL context.

因此alcMakeContextCurrent函数返回的是false，但我不确定为什么.音频并不是我真正的专长，我在这方面找不到太多信息，因此，你们能提供给我的任何帮助将不胜感激.

So alcMakeContextCurrent function is returning false, and I'm not sure why. Audio is not really my expertise, and I can't find much information on this, so any help you guys can give me would be appreciated.

谢谢！

我发现如果我颠倒了初始化的顺序，也就是我先初始化OpenAL，然后初始化AudioSession，它就可以工作了……尽管这是我以前使用的顺序，但是没有用，所以一定会发生有趣的事情；而且，它仍然不适用于旧版本的iOS

I've found if I reverse the order of initialization- that is if I initialize OpenAL and then the AudioSession, it works... although this is the order I had it in before and it wasn't working, so something funny is definitely going on; also, it still doesn't work with older versions of iOS

推荐答案

相反的初始化顺序似乎还可以，先是OpenAL，然后是AudioSession

Reverse order of initialization seems to work ok, OpenAL then AudioSession

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