Minor WebAudio fixes

components/script/dom/audiobuffer.rs

@@ -20,10 +20,10 @@ use servo_media::audio::buffer_source_node::AudioBuffer as ServoMediaAudioBuffer
 use std::cmp::min;
 use std::ptr::{self, NonNull};
 
-// This range is defined by the spec.
+// Spec mandates at least [8000, 96000], we use [8000, 192000] to match Firefox
 // https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-createbuffer
 pub const MIN_SAMPLE_RATE: f32 = 8000.;
-pub const MAX_SAMPLE_RATE: f32 = 96000.;
+pub const MAX_SAMPLE_RATE: f32 = 192000.;
 
 type JSAudioChannel = Heap<*mut JSObject>;
 

components/script/dom/offlineaudiocontext.rs

@@ -151,10 +151,14 @@ impl OfflineAudioContextMethods for OfflineAudioContext {
                     task!(resolve: move || {
                         let this = this.root();
                         let processed_audio = processed_audio.lock().unwrap();
-                        let processed_audio: Vec<_> = processed_audio
+                        let mut processed_audio: Vec<_> = processed_audio
                             .chunks(this.length as usize)
                             .map(|channel| channel.to_vec())
                             .collect();
+                        // it can end up being empty if the task failed
+                        if processed_audio.len() != this.length as usize {
+                            processed_audio.resize(this.length as usize, Vec::new())
+                        }
                         let buffer = AudioBuffer::new(
                             &this.global().as_window(),
                             this.channel_count,