| /* |
| * 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/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/modules/webaudio/channel_splitter_options.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) { |
| 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 (context.IsContextClosed()) { |
| context.ThrowExceptionForClosedState(exception_state); |
| return nullptr; |
| } |
| |
| 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 new 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; |
| } |
| |
| } // namespace blink |