Web Audio decodeAudioData iOS上的分块音频

Question

I'm looking into playing chunks of dash-audio (aac, 44100) through a sourceBufferNode. First I get the index byte range buffer which has all the header information. Second I get the chunk Third I concatenate the two buffers It works!!! but only on desktop

On iOS where I'm interested in using this, I get the null error on the decodeAudioData

If anyone has any ideas why Safari iOS behaves differently / ideas to get this working I would love to know.

EDIT:

Here is a repo for the code

Answer 1

From the Safari Developer Library at Apple:

Note : On iOS, the Web Audio API requires sounds to be triggered from an explicit user action, such as a tap. Calling noteOn() from an onload event will not play sound.

https://developer.apple.com/library/safari/documentation/AudioVideo/Conceptual/Using_HTML5_Audio_Video/PlayingandSynthesizingSounds/PlayingandSynthesizingSounds.html#//apple_ref/doc/uid/TP40009523-CH6-SW5

Safari is a long way behind the actual Web Audio API standard unfortunately so it may not work in your way right now.

In reality, you need a touch event to trigger playback of each element, not to trigger requests to schedule playback. It is part of a drive to both save battery by not rendering anything until the user commands it.