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LibWeb: Begin implementing the interface for AudioBuffer

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Implement the constructor and getChannelData function, working towards
the functionality that we need in order to implement
OfflineAudioContext.
This commit is contained in:
Shannon Booth 2024-04-25 15:13:51 +12:00 • committed by Tim Flynn
commit 0c8a98ac94
Notes: sideshowbarker 2024-07-17 10:05:47 +09:00
7 changed files with 271 additions and 0 deletions
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65
Userland/Libraries/LibWeb/WebAudio/AudioBuffer.h Normal file
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/*
* Copyright (c) 2024, Shannon Booth <shannon@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Vector.h>
#include <LibJS/Forward.h>
#include <LibJS/Runtime/ArrayBuffer.h>
#include <LibWeb/Bindings/PlatformObject.h>
#include <LibWeb/WebIDL/Buffers.h>
#include <LibWeb/WebIDL/ExceptionOr.h>
#include <LibWeb/WebIDL/Types.h>
namespace Web::WebAudio {
struct AudioBufferOptions {
WebIDL::UnsignedLong number_of_channels { 1 };
WebIDL::UnsignedLong length {};
float sample_rate {};
};
// https://webaudio.github.io/web-audio-api/#AudioContext
class AudioBuffer final : public Bindings::PlatformObject {
WEB_PLATFORM_OBJECT(AudioBuffer, Bindings::PlatformObject);
JS_DECLARE_ALLOCATOR(AudioBuffer);
public:
static WebIDL::ExceptionOr<JS::NonnullGCPtr<AudioBuffer>> construct_impl(JS::Realm&, AudioBufferOptions const&);
virtual ~AudioBuffer() override;
float sample_rate() const;
WebIDL::UnsignedLong length() const;
double duration() const;
WebIDL::UnsignedLong number_of_channels() const;
WebIDL::ExceptionOr<JS::NonnullGCPtr<JS::Float32Array>> get_channel_data(WebIDL::UnsignedLong channel) const;
WebIDL::ExceptionOr<void> copy_from_channel(JS::Handle<WebIDL::BufferSource> const&, WebIDL::UnsignedLong channel_number, WebIDL::UnsignedLong buffer_offset = 0) const;
WebIDL::ExceptionOr<void> copy_to_channel(JS::Handle<WebIDL::BufferSource>&, WebIDL::UnsignedLong channel_number, WebIDL::UnsignedLong buffer_offset = 0) const;
private:
explicit AudioBuffer(JS::Realm&, AudioBufferOptions const&);
virtual void initialize(JS::Realm&) override;
virtual void visit_edges(Cell::Visitor&) override;
// https://webaudio.github.io/web-audio-api/#dom-audiobuffer-number-of-channels-slot
// The number of audio channels for this AudioBuffer, which is an unsigned long.
//
// https://webaudio.github.io/web-audio-api/#dom-audiobuffer-internal-data-slot
// A data block holding the audio sample data.
Vector<JS::NonnullGCPtr<JS::Float32Array>> m_channels; // [[internal data]] / [[number_of_channels]]
// https://webaudio.github.io/web-audio-api/#dom-audiobuffer-length-slot
// The length of each channel of this AudioBuffer, which is an unsigned long.
WebIDL::UnsignedLong m_length {}; // [[length]]
// https://webaudio.github.io/web-audio-api/#dom-audiobuffer-sample-rate-slot
// The sample-rate, in Hz, of this AudioBuffer, a float.
float m_sample_rate {}; // [[sample rate]]
};
}