Fix loop audio would stop for ios system

[timlyeee]

• IOS system has an uncertain state between foreground and background, and our condition sometimes miss the point to load buffers.
• Queue for 3 buffers might be too short to live, use 4 or even more instead.
• Issue could be solved:
• iOS AudioEngine stops looping audio cocos2d/cocos2d-x#19480,
• https://github.com/cocos-creator/3d-tasks/issues/11135

[dumganhar]

Ref：cocos/cocos-engine#10094

[frozax]

It didn't fix the issue in my case (looping audio stops randomly, not necessarily at the loop section).

[timlyeee]

It didn't fix the issue in my case (looping audio stops randomly, not necessarily at the loop section).

@frozax Any issue related? Or could you describe it with details?

[frozax]

It didn't fix the issue in my case (looping audio stops randomly, not necessarily at the loop section).

@frozax Any issue related? Or could you describe it with details?

You're right it's missing some information, I'm sorry. On my 9 games, only one has music. It's a loop of 49 seconds. On iOS, it's a wav file of 4.19 Mb. I'm using cocos2dx 3.17.2, experimental::AudioEngine. On Android, I don't have any issue (using a 356k ogg of 49 seconds).
I've seen it happen regularly on a iPad Mini running iOS 11 (I think, I'll have to check with the owner), it happens usually between 1-10 minutes of gameplay. Once the music stopped, the AudioEngine::getState return that it's NOT AudioState::PLAYING (I can't tell more) and I can restart it again.
Hope this helps

[timlyeee]

Thank you for your information, we will try it.