Add an AudioManager struct to handle this list of actively playing
sounds. This will maintain information for each sound instance,
such as the owning display object, AVM1 object, etc.
This will allow us to implement the awkward AVM1 Sound API in a
fairly backend-agnostic way.
An issue with Arena::clear allowed stale sound instance indices
to be remain valid, causing certain sounds to be removed when they
shouldn't (#1315). Workaround this issue by forcing Arena to bump
the generational index.
Sounds were not being removed from the instance list when they
completed playing. This could also cause StartSound tags with
NoMultiple set to not play, because the previous sound was presumed
to be playing.
Fixes part of #1245.
Adds a suspend_audio method to compliment prime_audio on WebAudioBackend, as well as logic in player.rs on the set_is_playing method to suspend audio when is_playing is set to false. Exposes pause method for the ruffle player in JavaScript with logic to display the play button when paused.
The endTime parameter of AudioParam.linearRampToValueAtTime is
on the global AudioContext's timeline, not local to the sound.
Adding the sound's start time to the parameter fixes sound
envelopes not playing back correctly.
`AudioBuffer.copyToChannel` does not work on Safari, so switch to
using `getChannelData` to fill the audio buffers.
Limitations in wasm-bindgen prevent us from actually modifying the
data returned by `getChannelData` on the Rust side, so import a JS
function to fill the audio buffer (js-src/ruffle-imports.js).
When a stream sound uses ADPCM compression, the ADPCM header is
included in each SoundStreamBlock (as opposed to stream sounds
in the other formats). This header wasn't being parsed, resulting
in corrupted audio (see https://homestarrunner.com/main12.swf).
Renamed `AudioBackend::play_sound` to `start_sound`, and this
also takes a `SoundInfo` parameter with the event sound settings
from the SWF file.
Desktop now obeys the loop and start/end point settings. Envelopes
are still TODO.
Mike Welsh