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AudioBuffer.GetChannelData and internal storage
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commit
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2 changed files with 95 additions and 21 deletions
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@ -3,28 +3,27 @@
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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use dom::audionode::MAX_CHANNEL_COUNT;
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use dom::bindings::cell::DomRefCell;
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use dom::bindings::codegen::Bindings::AudioBufferBinding::{self, AudioBufferMethods, AudioBufferOptions};
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use dom::bindings::error::{Error, Fallible};
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use dom::bindings::num::Finite;
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use dom::bindings::reflector::{Reflector, reflect_dom_object};
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use dom::bindings::reflector::{DomObject, Reflector, reflect_dom_object};
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use dom::bindings::root::DomRoot;
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use dom::window::Window;
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use dom_struct::dom_struct;
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use smallvec::SmallVec;
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use js::conversions::ToJSValConvertible;
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use js::jsapi::{Heap, JSContext, JSObject, JS_StealArrayBufferContents};
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use js::typedarray::{CreateWith, Float32Array};
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use std::ptr::{self, NonNull};
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use std::slice;
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#[derive(JSTraceable, MallocSizeOf)]
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struct AudioChannel(pub Vec<f32>);
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impl AudioChannel {
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pub fn new(capacity: usize) -> AudioChannel {
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AudioChannel(Vec::with_capacity(capacity))
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}
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}
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type JSAudioChannel = Heap<*mut JSObject>;
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#[dom_struct]
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pub struct AudioBuffer {
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reflector_: Reflector,
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internal_data: SmallVec<[AudioChannel; MAX_CHANNEL_COUNT as usize]>,
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js_channels: Vec<JSAudioChannel>,
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shared_channels: DomRefCell<Option<Vec<Vec<f32>>>>,
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sample_rate: f32,
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length: u32,
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duration: f64,
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@ -35,11 +34,10 @@ impl AudioBuffer {
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#[allow(unrooted_must_root)]
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#[allow(unsafe_code)]
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pub fn new_inherited(options: &AudioBufferOptions) -> AudioBuffer {
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let mut internal_data = SmallVec::new();
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unsafe { internal_data.set_len(options.numberOfChannels as usize); }
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AudioBuffer {
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reflector_: Reflector::new(),
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internal_data,
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js_channels: Vec::with_capacity(options.numberOfChannels as usize),
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shared_channels: DomRefCell::new(None),
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sample_rate: *options.sampleRate,
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length: options.length,
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duration: options.length as f64 / *options.sampleRate as f64,
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@ -61,22 +59,98 @@ impl AudioBuffer {
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}
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Ok(AudioBuffer::new(window, options))
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}
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#[allow(unsafe_code)]
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fn restore_js_channel_data(&self, cx: *mut JSContext) -> bool {
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for (i, channel) in self.js_channels.iter().enumerate() {
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if !channel.get().is_null() {
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// Already have data in JS array.
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continue;
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}
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match *self.shared_channels.borrow_mut() {
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Some(ref mut shared_channels) => {
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// Step 4 of https://webaudio.github.io/web-audio-api/#acquire-the-content
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// "Attach ArrayBuffers containing copies of the data of the AudioBuffer, to
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// be returned by the next call to getChannelData()".
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rooted!(in (cx) let mut array = ptr::null_mut::<JSObject>());
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let shared_channel = shared_channels.remove(i);
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if unsafe {
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Float32Array::create(cx, CreateWith::Slice(&shared_channel), array.handle_mut())
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}.is_err() {
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return false;
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}
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channel.set(array.get());
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},
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None => return false,
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}
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}
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*self.shared_channels.borrow_mut() = None;
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true
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}
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/// https://webaudio.github.io/web-audio-api/#acquire-the-content
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#[allow(unsafe_code)]
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pub fn acquire_contents(&self) {
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let cx = self.global().get_cx();
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for (i, channel) in self.js_channels.iter().enumerate() {
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// Step 1.
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if channel.get().is_null() {
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return;
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}
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// Step 2.
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let channel_data = unsafe {
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slice::from_raw_parts(
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JS_StealArrayBufferContents(cx, channel.handle()) as *mut f32,
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self.length as usize
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).to_vec()
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};
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// Step 3.
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let mut shared_channels = self.shared_channels.borrow_mut();
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if shared_channels.is_none() {
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*shared_channels = Some(Vec::with_capacity(self.number_of_channels as usize));
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}
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(*shared_channels).as_mut().unwrap()[i] = channel_data;
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}
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}
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}
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impl AudioBufferMethods for AudioBuffer {
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/// https://webaudio.github.io/web-audio-api/#dom-audiobuffer-samplerate
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fn SampleRate(&self) -> Finite<f32> {
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Finite::wrap(self.sample_rate)
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}
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/// https://webaudio.github.io/web-audio-api/#dom-audiobuffer-length
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fn Length(&self) -> u32 {
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self.length
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}
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/// https://webaudio.github.io/web-audio-api/#dom-audiobuffer-duration
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fn Duration(&self) -> Finite<f64> {
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Finite::wrap(self.duration)
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}
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/// https://webaudio.github.io/web-audio-api/#dom-audiobuffer-numberofchannels
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fn NumberOfChannels(&self) -> u32 {
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self.number_of_channels
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}
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/// https://webaudio.github.io/web-audio-api/#dom-audiobuffer-getchanneldata
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#[allow(unsafe_code)]
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unsafe fn GetChannelData(&self, cx: *mut JSContext, channel: u32) -> Fallible<NonNull<JSObject>> {
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if channel >= self.number_of_channels {
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return Err(Error::IndexSize);
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}
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if !self.restore_js_channel_data(cx) {
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return Err(Error::JSFailed);
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}
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Ok(NonNull::new_unchecked(self.js_channels[channel as usize].get()))
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}
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}
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@ -19,11 +19,11 @@ interface AudioBuffer {
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readonly attribute unsigned long length;
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readonly attribute double duration;
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readonly attribute unsigned long numberOfChannels;
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// Float32Array getChannelData(unsigned long channel);
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// void copyFromChannel(Float32Array destination,
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// unsigned long channelNumber,
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// optional unsigned long startInChannel = 0);
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// void copyToChannel (Float32Array source,
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// unsigned long channelNumber,
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// optional unsigned long startInChannel = 0);
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[Throws] Float32Array getChannelData(unsigned long channel);
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//[Throws] void copyFromChannel(Float32Array destination,
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// unsigned long channelNumber,
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// optional unsigned long startInChannel = 0);
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//[Throws] void copyToChannel(Float32Array source,
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// unsigned long channelNumber,
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// optional unsigned long startInChannel = 0);
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};
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