mirror of
https://github.com/mozilla/gecko-dev.git
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268 lines
8.2 KiB
C++
268 lines
8.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "AudioBuffer.h"
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#include "mozilla/dom/AudioBufferBinding.h"
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#include "jsfriendapi.h"
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#include "mozilla/ErrorResult.h"
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#include "AudioSegment.h"
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#include "AudioChannelFormat.h"
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#include "mozilla/PodOperations.h"
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#include "mozilla/CheckedInt.h"
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#include "AudioNodeEngine.h"
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namespace mozilla {
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namespace dom {
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NS_IMPL_CYCLE_COLLECTION_CLASS(AudioBuffer)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(AudioBuffer)
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mContext)
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mJSChannels)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
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tmp->ClearJSChannels();
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NS_IMPL_CYCLE_COLLECTION_UNLINK_END
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(AudioBuffer)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mContext)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
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NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(AudioBuffer)
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NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
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for (uint32_t i = 0; i < tmp->mJSChannels.Length(); ++i) {
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NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mJSChannels[i])
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}
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NS_IMPL_CYCLE_COLLECTION_TRACE_END
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NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(AudioBuffer, AddRef)
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NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(AudioBuffer, Release)
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AudioBuffer::AudioBuffer(AudioContext* aContext, uint32_t aNumberOfChannels,
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uint32_t aLength, float aSampleRate)
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: mContext(aContext),
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mLength(aLength),
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mSampleRate(aSampleRate)
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{
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mJSChannels.SetCapacity(aNumberOfChannels);
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mozilla::HoldJSObjects(this);
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}
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AudioBuffer::~AudioBuffer()
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{
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ClearJSChannels();
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}
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void
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AudioBuffer::ClearJSChannels()
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{
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mJSChannels.Clear();
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mozilla::DropJSObjects(this);
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}
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/* static */ already_AddRefed<AudioBuffer>
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AudioBuffer::Create(AudioContext* aContext, uint32_t aNumberOfChannels,
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uint32_t aLength, float aSampleRate,
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JSContext* aJSContext, ErrorResult& aRv)
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{
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// Note that a buffer with zero channels is permitted here for the sake of
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// AudioProcessingEvent, where channel counts must match parameters passed
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// to createScriptProcessor(), one of which may be zero.
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if (aSampleRate < WebAudioUtils::MinSampleRate ||
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aSampleRate > WebAudioUtils::MaxSampleRate ||
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aNumberOfChannels > WebAudioUtils::MaxChannelCount ||
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!aLength || aLength > INT32_MAX) {
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aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
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return nullptr;
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}
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nsRefPtr<AudioBuffer> buffer =
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new AudioBuffer(aContext, aNumberOfChannels, aLength, aSampleRate);
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for (uint32_t i = 0; i < aNumberOfChannels; ++i) {
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JS::Rooted<JSObject*> array(aJSContext,
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JS_NewFloat32Array(aJSContext, aLength));
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if (!array) {
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aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
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return nullptr;
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}
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buffer->mJSChannels.AppendElement(array.get());
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}
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return buffer.forget();
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}
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JSObject*
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AudioBuffer::WrapObject(JSContext* aCx)
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{
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return AudioBufferBinding::Wrap(aCx, this);
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}
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bool
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AudioBuffer::RestoreJSChannelData(JSContext* aJSContext)
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{
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if (mSharedChannels) {
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for (uint32_t i = 0; i < mJSChannels.Length(); ++i) {
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const float* data = mSharedChannels->GetData(i);
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// The following code first zeroes the array and then copies our data
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// into it. We could avoid this with additional JS APIs to construct
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// an array (or ArrayBuffer) containing initial data.
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JS::Rooted<JSObject*> array(aJSContext,
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JS_NewFloat32Array(aJSContext, mLength));
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if (!array) {
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return false;
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}
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memcpy(JS_GetFloat32ArrayData(array), data, sizeof(float)*mLength);
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mJSChannels[i] = array;
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}
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mSharedChannels = nullptr;
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}
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return true;
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}
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void
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AudioBuffer::CopyFromChannel(const Float32Array& aDestination, uint32_t aChannelNumber,
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uint32_t aStartInChannel, ErrorResult& aRv)
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{
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aDestination.ComputeLengthAndData();
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uint32_t length = aDestination.Length();
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CheckedInt<uint32_t> end = aStartInChannel;
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end += length;
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if (aChannelNumber >= NumberOfChannels() ||
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!end.isValid() || end.value() > mLength) {
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aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
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return;
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}
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if (!mSharedChannels && JS_GetTypedArrayLength(mJSChannels[aChannelNumber]) != mLength) {
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// The array was probably neutered
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aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
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return;
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}
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const float* sourceData = mSharedChannels ?
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mSharedChannels->GetData(aChannelNumber) :
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JS_GetFloat32ArrayData(mJSChannels[aChannelNumber]);
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PodMove(aDestination.Data(), sourceData + aStartInChannel, length);
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}
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void
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AudioBuffer::CopyToChannel(JSContext* aJSContext, const Float32Array& aSource,
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uint32_t aChannelNumber, uint32_t aStartInChannel,
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ErrorResult& aRv)
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{
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aSource.ComputeLengthAndData();
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uint32_t length = aSource.Length();
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CheckedInt<uint32_t> end = aStartInChannel;
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end += length;
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if (aChannelNumber >= NumberOfChannels() ||
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!end.isValid() || end.value() > mLength) {
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aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
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return;
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}
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if (!mSharedChannels && JS_GetTypedArrayLength(mJSChannels[aChannelNumber]) != mLength) {
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// The array was probably neutered
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aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
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return;
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}
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if (!RestoreJSChannelData(aJSContext)) {
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aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
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return;
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}
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PodMove(JS_GetFloat32ArrayData(mJSChannels[aChannelNumber]) + aStartInChannel,
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aSource.Data(), length);
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}
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void
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AudioBuffer::SetRawChannelContents(uint32_t aChannel, float* aContents)
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{
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MOZ_ASSERT(!GetWrapperPreserveColor() && !mSharedChannels,
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"The AudioBuffer object should not have been handed to JS or have C++ callers neuter its typed array");
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PodCopy(JS_GetFloat32ArrayData(mJSChannels[aChannel]), aContents, mLength);
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}
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void
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AudioBuffer::GetChannelData(JSContext* aJSContext, uint32_t aChannel,
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JS::MutableHandle<JSObject*> aRetval,
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ErrorResult& aRv)
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{
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if (aChannel >= NumberOfChannels()) {
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aRv.Throw(NS_ERROR_DOM_SYNTAX_ERR);
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return;
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}
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if (!RestoreJSChannelData(aJSContext)) {
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aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
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return;
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}
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if (mJSChannels[aChannel]) {
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JS::ExposeObjectToActiveJS(mJSChannels[aChannel]);
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}
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aRetval.set(mJSChannels[aChannel]);
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}
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static already_AddRefed<ThreadSharedFloatArrayBufferList>
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StealJSArrayDataIntoThreadSharedFloatArrayBufferList(JSContext* aJSContext,
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const nsTArray<JSObject*>& aJSArrays)
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{
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nsRefPtr<ThreadSharedFloatArrayBufferList> result =
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new ThreadSharedFloatArrayBufferList(aJSArrays.Length());
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for (uint32_t i = 0; i < aJSArrays.Length(); ++i) {
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JS::Rooted<JSObject*> arrayBufferView(aJSContext, aJSArrays[i]);
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JS::Rooted<JSObject*> arrayBuffer(aJSContext,
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JS_GetArrayBufferViewBuffer(aJSContext, arrayBufferView));
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uint8_t* stolenData = arrayBuffer
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? (uint8_t*) JS_StealArrayBufferContents(aJSContext, arrayBuffer)
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: nullptr;
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if (stolenData) {
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result->SetData(i, stolenData, reinterpret_cast<float*>(stolenData));
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} else {
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return nullptr;
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}
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}
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return result.forget();
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}
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ThreadSharedFloatArrayBufferList*
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AudioBuffer::GetThreadSharedChannelsForRate(JSContext* aJSContext)
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{
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if (!mSharedChannels) {
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for (uint32_t i = 0; i < mJSChannels.Length(); ++i) {
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if (mLength != JS_GetTypedArrayLength(mJSChannels[i])) {
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// Probably one of the arrays was neutered
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return nullptr;
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}
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}
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mSharedChannels =
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StealJSArrayDataIntoThreadSharedFloatArrayBufferList(aJSContext, mJSChannels);
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}
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return mSharedChannels;
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}
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size_t
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AudioBuffer::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
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{
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size_t amount = aMallocSizeOf(this);
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amount += mJSChannels.SizeOfExcludingThis(aMallocSizeOf);
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if (mSharedChannels) {
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amount += mSharedChannels->SizeOfIncludingThis(aMallocSizeOf);
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}
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return amount;
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}
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}
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}
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