LibWeb: Add ChannelMergerNode interface

Author: https://github.com/gmta Commit: be3a941f44 Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2569
2025-06-21 17:51:52 +00:00 · 2024-11-25 14:30:36 +01:00 · 2024-11-25 14:30:36 +01:00 · be3a941f44 · 2024-11-25 16:17:02 +00:00
commit be3a941f44
parent 08b7e83f95
10 changed files with 144 additions and 1 deletions
--- a/Libraries/LibWeb/WebAudio/ChannelMergerNode.cpp
+++ b/Libraries/LibWeb/WebAudio/ChannelMergerNode.cpp
@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2024, Jelle Raaijmakers <jelle@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibWeb/WebAudio/BaseAudioContext.h>
+#include <LibWeb/WebAudio/ChannelMergerNode.h>
+
+namespace Web::WebAudio {
+
+GC_DEFINE_ALLOCATOR(ChannelMergerNode);
+
+ChannelMergerNode::ChannelMergerNode(JS::Realm& realm, GC::Ref<BaseAudioContext> context, ChannelMergerOptions const& options)
+    : AudioNode(realm, context)
+    , m_number_of_inputs(options.number_of_inputs)
+{
+}
+
+ChannelMergerNode::~ChannelMergerNode() = default;
+
+WebIDL::ExceptionOr<GC::Ref<ChannelMergerNode>> ChannelMergerNode::create(JS::Realm& realm, GC::Ref<BaseAudioContext> context, ChannelMergerOptions const& options)
+{
+    return construct_impl(realm, context, options);
+}
+
+WebIDL::ExceptionOr<GC::Ref<ChannelMergerNode>> ChannelMergerNode::construct_impl(JS::Realm& realm, GC::Ref<BaseAudioContext> context, ChannelMergerOptions const& options)
+{
+    // https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-createchannelmerger
+    // An IndexSizeError exception MUST be thrown if numberOfInputs is less than 1 or is greater
+    // than the number of supported channels.
+    if (options.number_of_inputs < 1 || options.number_of_inputs > BaseAudioContext::MAX_NUMBER_OF_CHANNELS)
+        return WebIDL::IndexSizeError::create(realm, "Invalid number of inputs"_string);
+
+    auto node = realm.create<ChannelMergerNode>(realm, context, options);
+
+    // Default options for channel count and interpretation
+    // https://webaudio.github.io/web-audio-api/#BiquadFilterNode
+    AudioNodeDefaultOptions default_options;
+    default_options.channel_count_mode = Bindings::ChannelCountMode::Explicit;
+    default_options.channel_interpretation = Bindings::ChannelInterpretation::Speakers;
+    default_options.channel_count = 1;
+    // FIXME: Set tail-time to no
+
+    TRY(node->initialize_audio_node_options(options, default_options));
+
+    return node;
+}
+
+// https://webaudio.github.io/web-audio-api/#audionode-channelcount-constraints
+WebIDL::ExceptionOr<void> ChannelMergerNode::set_channel_count(WebIDL::UnsignedLong channel_count)
+{
+    // The channel count cannot be changed, and an InvalidStateError exception MUST be thrown for
+    // any attempt to change the value.
+    if (channel_count != 1)
+        return WebIDL::InvalidStateError::create(realm(), "Channel count cannot be changed"_string);
+
+    return Base::set_channel_count(channel_count);
+}
+
+WebIDL::ExceptionOr<void> ChannelMergerNode::set_channel_count_mode(Bindings::ChannelCountMode channel_count_mode)
+{
+    // The channel count mode cannot be changed from "explicit" and an InvalidStateError exception
+    // MUST be thrown for any attempt to change the value.
+    if (channel_count_mode != Bindings::ChannelCountMode::Explicit)
+        return WebIDL::InvalidStateError::create(realm(), "Channel count mode cannot be changed"_string);
+
+    return Base::set_channel_count_mode(channel_count_mode);
+}
+
+}