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decodeAudioData

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This commit is contained in:
Fernando Jiménez Moreno 2018-07-09 13:32:26 +02:00
parent e0e1141e74
commit b87fc17b4b
3 changed files with 125 additions and 20 deletions
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27
components/script/dom/audiobuffer.rs
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@ -38,13 +38,25 @@ impl AudioBuffer {
pub fn new_inherited(cx: *mut JSContext,
number_of_channels: u32,
length: u32,
sample_rate: f32) -> AudioBuffer {
let initial_data = vec![0.; length as usize];
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 mut js_channels: Vec<JSAudioChannel> = Vec::with_capacity(number_of_channels as usize);
for _ in 0..number_of_channels {
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()), array.handle_mut())
Float32Array::create(
cx,
CreateWith::Slice(&initial_data.as_slice()[offset..offset + (length as usize)]),
array.handle_mut())
};
let js_channel = Heap::default();
js_channel.set(array.get());
@ -65,8 +77,9 @@ impl AudioBuffer {
pub fn new(global: &Window,
number_of_channels: u32,
length: u32,
sample_rate: f32) -> DomRoot<AudioBuffer> {
let buffer = AudioBuffer::new_inherited(global.get_cx(), number_of_channels, length, sample_rate);
sample_rate: f32,
initial_data: Option<&[f32]>) -> DomRoot<AudioBuffer> {
let buffer = AudioBuffer::new_inherited(global.get_cx(), number_of_channels, length, sample_rate, initial_data);
reflect_dom_object(Box::new(buffer), global, AudioBufferBinding::Wrap)
}
@ -75,7 +88,7 @@ impl AudioBuffer {
if options.numberOfChannels > MAX_CHANNEL_COUNT {
return Err(Error::NotSupported);
}
Ok(AudioBuffer::new(window, options.numberOfChannels, options.length, *options.sampleRate))
Ok(AudioBuffer::new(window, options.numberOfChannels, options.length, *options.sampleRate, None))
}
#[allow(unsafe_code)]