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/*
* Copyright (C) 2010, Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*/
#include "third_party/blink/renderer/modules/webaudio/channel_splitter_node.h"
#include "third_party/blink/renderer/bindings/modules/v8/v8_channel_splitter_options.h"
#include "third_party/blink/renderer/modules/webaudio/audio_node_input.h"
#include "third_party/blink/renderer/modules/webaudio/audio_node_output.h"
#include "third_party/blink/renderer/modules/webaudio/base_audio_context.h"
#include "third_party/blink/renderer/platform/bindings/exception_messages.h"
#include "third_party/blink/renderer/platform/bindings/exception_state.h"
namespace blink {
ChannelSplitterHandler::ChannelSplitterHandler(AudioNode& node,
float sample_rate,
unsigned number_of_outputs)
: AudioHandler(kNodeTypeChannelSplitter, node, sample_rate) {
// These properties are fixed and cannot be changed by the user.
channel_count_ = number_of_outputs;
SetInternalChannelCountMode(kExplicit);
SetInternalChannelInterpretation(AudioBus::kDiscrete);
AddInput();
// Create a fixed number of outputs (able to handle the maximum number of
// channels fed to an input).
for (unsigned i = 0; i < number_of_outputs; ++i)
AddOutput(1);
Initialize();
}
scoped_refptr<ChannelSplitterHandler> ChannelSplitterHandler::Create(
AudioNode& node,
float sample_rate,
unsigned number_of_outputs) {
return base::AdoptRef(
new ChannelSplitterHandler(node, sample_rate, number_of_outputs));
}
void ChannelSplitterHandler::Process(uint32_t frames_to_process) {
scoped_refptr<AudioBus> source = Input(0).Bus();
DCHECK(source);
DCHECK_EQ(frames_to_process, source->length());
unsigned number_of_source_channels = source->NumberOfChannels();
for (unsigned i = 0; i < NumberOfOutputs(); ++i) {
AudioBus* destination = Output(i).Bus();
DCHECK(destination);
if (i < number_of_source_channels) {
// Split the channel out if it exists in the source.
// It would be nice to avoid the copy and simply pass along pointers, but
// this becomes extremely difficult with fanout and fanin.
destination->Channel(0)->CopyFrom(source->Channel(i));
} else if (Output(i).RenderingFanOutCount() > 0) {
// Only bother zeroing out the destination if it's connected to anything
destination->Zero();
}
}
}
void ChannelSplitterHandler::SetChannelCount(unsigned channel_count,
ExceptionState& exception_state) {
DCHECK(IsMainThread());
BaseAudioContext::GraphAutoLocker locker(Context());
// channelCount cannot be changed from the number of outputs.
if (channel_count != NumberOfOutputs()) {
exception_state.ThrowDOMException(
DOMExceptionCode::kInvalidStateError,
"ChannelSplitter: channelCount cannot be changed from " +
String::Number(NumberOfOutputs()));
}
}
void ChannelSplitterHandler::SetChannelCountMode(
const String& mode,
ExceptionState& exception_state) {
DCHECK(IsMainThread());
BaseAudioContext::GraphAutoLocker locker(Context());
// channcelCountMode must be 'explicit'.
if (mode != "explicit") {
exception_state.ThrowDOMException(
DOMExceptionCode::kInvalidStateError,
"ChannelSplitter: channelCountMode cannot be changed from 'explicit'");
}
}
void ChannelSplitterHandler::SetChannelInterpretation(
const String& mode,
ExceptionState& exception_state) {
DCHECK(IsMainThread());
BaseAudioContext::GraphAutoLocker locker(Context());
// channelInterpretation must be "discrete"
if (mode != "discrete") {
exception_state.ThrowDOMException(DOMExceptionCode::kInvalidStateError,
"ChannelSplitter: channelInterpretation "
"cannot be changed from 'discrete'");
}
}
// ----------------------------------------------------------------
ChannelSplitterNode::ChannelSplitterNode(BaseAudioContext& context,
unsigned number_of_outputs)
: AudioNode(context) {
SetHandler(ChannelSplitterHandler::Create(*this, context.sampleRate(),
number_of_outputs));
}
ChannelSplitterNode* ChannelSplitterNode::Create(
BaseAudioContext& context,
ExceptionState& exception_state) {
DCHECK(IsMainThread());
// Default number of outputs for the splitter node is 6.
return Create(context, 6, exception_state);
}
ChannelSplitterNode* ChannelSplitterNode::Create(
BaseAudioContext& context,
unsigned number_of_outputs,
ExceptionState& exception_state) {
DCHECK(IsMainThread());
if (!number_of_outputs ||
number_of_outputs > BaseAudioContext::MaxNumberOfChannels()) {
exception_state.ThrowDOMException(
DOMExceptionCode::kIndexSizeError,
ExceptionMessages::IndexOutsideRange<size_t>(
"number of outputs", number_of_outputs, 1,
ExceptionMessages::kInclusiveBound,
BaseAudioContext::MaxNumberOfChannels(),
ExceptionMessages::kInclusiveBound));
return nullptr;
}
return MakeGarbageCollected<ChannelSplitterNode>(context, number_of_outputs);
}
ChannelSplitterNode* ChannelSplitterNode::Create(
BaseAudioContext* context,
const ChannelSplitterOptions* options,
ExceptionState& exception_state) {
ChannelSplitterNode* node =
Create(*context, options->numberOfOutputs(), exception_state);
if (!node)
return nullptr;
node->HandleChannelOptions(options, exception_state);
return node;
}
void ChannelSplitterNode::ReportDidCreate() {
GraphTracer().DidCreateAudioNode(this);
}
void ChannelSplitterNode::ReportWillBeDestroyed() {
GraphTracer().WillDestroyAudioNode(this);
}
} // namespace blink
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