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Do not copy initial data during AudioBuffer construction and use JS_DetachArrayBuffer

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This commit is contained in:
Fernando Jiménez Moreno 2018-07-13 21:49:11 +02:00
parent 1649b6a528
commit 477907e578
1 changed files with 22 additions and 19 deletions
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41
components/script/dom/audiobuffer.rs
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@ -11,7 +11,7 @@ use dom::bindings::reflector::{DomObject, Reflector, reflect_dom_object};
use dom::bindings::root::DomRoot;
use dom::window::Window;
use dom_struct::dom_struct;
use js::jsapi::{Heap, JSContext, JSObject, JS_StealArrayBufferContents};
use js::jsapi::{DetachDataDisposition, Heap, JSContext, JSObject, JS_DetachArrayBuffer};
use js::rust::CustomAutoRooterGuard;
use js::typedarray::{CreateWith, Float32Array};
use servo_media::audio::buffer_source_node::AudioBuffer as ServoMediaAudioBuffer;
@ -42,26 +42,31 @@ impl AudioBuffer {
sample_rate: f32,
initial_data: Option<&[f32]>,
) -> AudioBuffer {
let initial_data = match initial_data {
Some(initial_data) => {
let mut data = vec![];
data.extend_from_slice(initial_data);
data
},
None => vec![0.; (length * number_of_channels) as usize],
};
let cx = global.get_cx();
let mut js_channels: Vec<JSAudioChannel> = Vec::with_capacity(number_of_channels as usize);
for channel in 0..number_of_channels {
rooted!(in (cx) let mut array = ptr::null_mut::<JSObject>());
let offset = (channel * length) as usize;
let _ = unsafe {
Float32Array::create(
cx,
CreateWith::Slice(&initial_data.as_slice()[offset..offset + (length as usize)]),
array.handle_mut(),
)
};
match initial_data {
Some(data) => {
let _ = unsafe {
Float32Array::create(
cx,
CreateWith::Slice(&data[offset..offset + (length as usize) - 1]),
array.handle_mut(),
)
};
},
None => {
let _ = unsafe {
Float32Array::create(
cx,
CreateWith::Slice(&vec![0.; length as usize]),
array.handle_mut(),
)
};
}
}
let js_channel = Heap::default();
js_channel.set(array.get());
js_channels.push(js_channel);
@ -151,10 +156,8 @@ impl AudioBuffer {
let channel_data = unsafe {
typedarray!(in(cx) let array: Float32Array = channel.get());
if let Ok(array) = array {
// XXX TypedArrays API does not expose a way to steal the buffer's
// content.
let data = array.to_vec();
let _ = JS_StealArrayBufferContents(cx, channel.handle());
let _ = JS_DetachArrayBuffer(cx, channel.handle(), DetachDataDisposition::KeepData);
data
} else {
return None;