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https://github.com/LadybirdBrowser/ladybird.git
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0c8a98ac94
Implement the constructor and getChannelData function, working towards the functionality that we need in order to implement OfflineAudioContext.
116 lines
4.4 KiB
C++
116 lines
4.4 KiB
C++
/*
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* Copyright (c) 2024, Shannon Booth <shannon@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibJS/Runtime/Completion.h>
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#include <LibJS/Runtime/Realm.h>
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#include <LibJS/Runtime/TypedArray.h>
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#include <LibJS/Runtime/VM.h>
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#include <LibWeb/Bindings/Intrinsics.h>
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#include <LibWeb/WebAudio/AudioBuffer.h>
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#include <LibWeb/WebAudio/BaseAudioContext.h>
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#include <LibWeb/WebIDL/DOMException.h>
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namespace Web::WebAudio {
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JS_DEFINE_ALLOCATOR(AudioBuffer);
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WebIDL::ExceptionOr<JS::NonnullGCPtr<AudioBuffer>> AudioBuffer::construct_impl(JS::Realm& realm, AudioBufferOptions const& options)
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{
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auto& vm = realm.vm();
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// 1. If any of the values in options lie outside its nominal range, throw a NotSupportedError exception and abort the following steps.
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TRY(BaseAudioContext::verify_audio_options_inside_nominal_range(realm, options.number_of_channels, options.length, options.sample_rate));
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// 2. Let b be a new AudioBuffer object.
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// 3. Respectively assign the values of the attributes numberOfChannels, length, sampleRate of the AudioBufferOptions passed in the
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// constructor to the internal slots [[number of channels]], [[length]], [[sample rate]].
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auto buffer = vm.heap().allocate<AudioBuffer>(realm, realm, options);
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// 4. Set the internal slot [[internal data]] of this AudioBuffer to the result of calling CreateByteDataBlock([[length]] * [[number of channels]]).
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buffer->m_channels.ensure_capacity(options.number_of_channels);
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for (WebIDL::UnsignedLong i = 0; i < options.number_of_channels; ++i)
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buffer->m_channels.unchecked_append(TRY(JS::Float32Array::create(realm, options.length)));
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return buffer;
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}
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AudioBuffer::~AudioBuffer() = default;
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// https://webaudio.github.io/web-audio-api/#dom-audiobuffer-samplerate
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float AudioBuffer::sample_rate() const
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{
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// The sample-rate for the PCM audio data in samples per second. This MUST return the value of [[sample rate]].
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return m_sample_rate;
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}
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// https://webaudio.github.io/web-audio-api/#dom-audiobuffer-length
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WebIDL::UnsignedLong AudioBuffer::length() const
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{
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// Length of the PCM audio data in sample-frames. This MUST return the value of [[length]].
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return m_length;
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}
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// https://webaudio.github.io/web-audio-api/#dom-audiobuffer-duration
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double AudioBuffer::duration() const
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{
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// Duration of the PCM audio data in seconds.
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// This is computed from the [[sample rate]] and the [[length]] of the AudioBuffer by performing a division between the [[length]] and the [[sample rate]].
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return m_length / static_cast<double>(m_sample_rate);
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}
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// https://webaudio.github.io/web-audio-api/#dom-audiobuffer-numberofchannels
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WebIDL::UnsignedLong AudioBuffer::number_of_channels() const
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{
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// The number of discrete audio channels. This MUST return the value of [[number of channels]].
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return m_channels.size();
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}
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// https://webaudio.github.io/web-audio-api/#dom-audiobuffer-getchanneldata
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WebIDL::ExceptionOr<JS::NonnullGCPtr<JS::Float32Array>> AudioBuffer::get_channel_data(WebIDL::UnsignedLong channel) const
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{
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if (channel >= m_channels.size())
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return WebIDL::IndexSizeError::create(realm(), "Channel index is out of range"_fly_string);
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return m_channels[channel];
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}
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// https://webaudio.github.io/web-audio-api/#dom-audiobuffer-copyfromchannel
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WebIDL::ExceptionOr<void> AudioBuffer::copy_from_channel(JS::Handle<WebIDL::BufferSource> const&, WebIDL::UnsignedLong channel_number, WebIDL::UnsignedLong buffer_offset) const
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{
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(void)channel_number;
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(void)buffer_offset;
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return WebIDL::NotSupportedError::create(realm(), "FIXME: Implement AudioBuffer:copy_from_channel:"_fly_string);
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}
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// https://webaudio.github.io/web-audio-api/#dom-audiobuffer-copytochannel
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WebIDL::ExceptionOr<void> AudioBuffer::copy_to_channel(JS::Handle<WebIDL::BufferSource>&, WebIDL::UnsignedLong channel_number, WebIDL::UnsignedLong buffer_offset) const
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{
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(void)channel_number;
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(void)buffer_offset;
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return WebIDL::NotSupportedError::create(realm(), "FIXME: Implement AudioBuffer:copy_to_channel:"_fly_string);
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}
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AudioBuffer::AudioBuffer(JS::Realm& realm, AudioBufferOptions const& options)
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: Bindings::PlatformObject(realm)
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, m_length(options.length)
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, m_sample_rate(options.sample_rate)
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{
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}
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void AudioBuffer::initialize(JS::Realm& realm)
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{
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Base::initialize(realm);
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WEB_SET_PROTOTYPE_FOR_INTERFACE(AudioBuffer);
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}
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void AudioBuffer::visit_edges(Cell::Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(m_channels);
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}
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}
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