1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/webaudio/AudioBuffer.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,266 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* vim:set ts=2 sw=2 sts=2 et cindent: */
1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#include "AudioBuffer.h"
1.11 +#include "mozilla/dom/AudioBufferBinding.h"
1.12 +#include "jsfriendapi.h"
1.13 +#include "mozilla/ErrorResult.h"
1.14 +#include "AudioSegment.h"
1.15 +#include "AudioChannelFormat.h"
1.16 +#include "mozilla/PodOperations.h"
1.17 +#include "mozilla/CheckedInt.h"
1.18 +#include "AudioNodeEngine.h"
1.19 +
1.20 +namespace mozilla {
1.21 +namespace dom {
1.22 +
1.23 +NS_IMPL_CYCLE_COLLECTION_CLASS(AudioBuffer)
1.24 +
1.25 +NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(AudioBuffer)
1.26 + NS_IMPL_CYCLE_COLLECTION_UNLINK(mContext)
1.27 + NS_IMPL_CYCLE_COLLECTION_UNLINK(mJSChannels)
1.28 + NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
1.29 + tmp->ClearJSChannels();
1.30 +NS_IMPL_CYCLE_COLLECTION_UNLINK_END
1.31 +
1.32 +NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(AudioBuffer)
1.33 + NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mContext)
1.34 + NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
1.35 +NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
1.36 +
1.37 +NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(AudioBuffer)
1.38 + NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
1.39 + for (uint32_t i = 0; i < tmp->mJSChannels.Length(); ++i) {
1.40 + NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mJSChannels[i])
1.41 + }
1.42 +NS_IMPL_CYCLE_COLLECTION_TRACE_END
1.43 +
1.44 +NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(AudioBuffer, AddRef)
1.45 +NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(AudioBuffer, Release)
1.46 +
1.47 +AudioBuffer::AudioBuffer(AudioContext* aContext, uint32_t aNumberOfChannels,
1.48 + uint32_t aLength, float aSampleRate)
1.49 + : mContext(aContext),
1.50 + mLength(aLength),
1.51 + mSampleRate(aSampleRate)
1.52 +{
1.53 + mJSChannels.SetCapacity(aNumberOfChannels);
1.54 + SetIsDOMBinding();
1.55 + mozilla::HoldJSObjects(this);
1.56 +}
1.57 +
1.58 +AudioBuffer::~AudioBuffer()
1.59 +{
1.60 + ClearJSChannels();
1.61 +}
1.62 +
1.63 +void
1.64 +AudioBuffer::ClearJSChannels()
1.65 +{
1.66 + mJSChannels.Clear();
1.67 + mozilla::DropJSObjects(this);
1.68 +}
1.69 +
1.70 +/* static */ already_AddRefed<AudioBuffer>
1.71 +AudioBuffer::Create(AudioContext* aContext, uint32_t aNumberOfChannels,
1.72 + uint32_t aLength, float aSampleRate,
1.73 + JSContext* aJSContext, ErrorResult& aRv)
1.74 +{
1.75 + // Note that a buffer with zero channels is permitted here for the sake of
1.76 + // AudioProcessingEvent, where channel counts must match parameters passed
1.77 + // to createScriptProcessor(), one of which may be zero.
1.78 + if (aSampleRate < WebAudioUtils::MinSampleRate ||
1.79 + aSampleRate > WebAudioUtils::MaxSampleRate ||
1.80 + aNumberOfChannels > WebAudioUtils::MaxChannelCount ||
1.81 + !aLength || aLength > INT32_MAX) {
1.82 + aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
1.83 + return nullptr;
1.84 + }
1.85 +
1.86 + nsRefPtr<AudioBuffer> buffer =
1.87 + new AudioBuffer(aContext, aNumberOfChannels, aLength, aSampleRate);
1.88 +
1.89 + for (uint32_t i = 0; i < aNumberOfChannels; ++i) {
1.90 + JS::Rooted<JSObject*> array(aJSContext,
1.91 + JS_NewFloat32Array(aJSContext, aLength));
1.92 + if (!array) {
1.93 + aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
1.94 + return nullptr;
1.95 + }
1.96 + buffer->mJSChannels.AppendElement(array.get());
1.97 + }
1.98 +
1.99 + return buffer.forget();
1.100 +}
1.101 +
1.102 +JSObject*
1.103 +AudioBuffer::WrapObject(JSContext* aCx)
1.104 +{
1.105 + return AudioBufferBinding::Wrap(aCx, this);
1.106 +}
1.107 +
1.108 +bool
1.109 +AudioBuffer::RestoreJSChannelData(JSContext* aJSContext)
1.110 +{
1.111 + if (mSharedChannels) {
1.112 + for (uint32_t i = 0; i < mJSChannels.Length(); ++i) {
1.113 + const float* data = mSharedChannels->GetData(i);
1.114 + // The following code first zeroes the array and then copies our data
1.115 + // into it. We could avoid this with additional JS APIs to construct
1.116 + // an array (or ArrayBuffer) containing initial data.
1.117 + JS::Rooted<JSObject*> array(aJSContext,
1.118 + JS_NewFloat32Array(aJSContext, mLength));
1.119 + if (!array) {
1.120 + return false;
1.121 + }
1.122 + memcpy(JS_GetFloat32ArrayData(array), data, sizeof(float)*mLength);
1.123 + mJSChannels[i] = array;
1.124 + }
1.125 +
1.126 + mSharedChannels = nullptr;
1.127 + }
1.128 +
1.129 + return true;
1.130 +}
1.131 +
1.132 +void
1.133 +AudioBuffer::CopyFromChannel(const Float32Array& aDestination, uint32_t aChannelNumber,
1.134 + uint32_t aStartInChannel, ErrorResult& aRv)
1.135 +{
1.136 + aDestination.ComputeLengthAndData();
1.137 +
1.138 + uint32_t length = aDestination.Length();
1.139 + CheckedInt<uint32_t> end = aStartInChannel;
1.140 + end += length;
1.141 + if (aChannelNumber >= NumberOfChannels() ||
1.142 + !end.isValid() || end.value() > mLength) {
1.143 + aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
1.144 + return;
1.145 + }
1.146 +
1.147 + if (!mSharedChannels && JS_GetTypedArrayLength(mJSChannels[aChannelNumber]) != mLength) {
1.148 + // The array was probably neutered
1.149 + aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
1.150 + return;
1.151 + }
1.152 +
1.153 + const float* sourceData = mSharedChannels ?
1.154 + mSharedChannels->GetData(aChannelNumber) :
1.155 + JS_GetFloat32ArrayData(mJSChannels[aChannelNumber]);
1.156 + PodMove(aDestination.Data(), sourceData + aStartInChannel, length);
1.157 +}
1.158 +
1.159 +void
1.160 +AudioBuffer::CopyToChannel(JSContext* aJSContext, const Float32Array& aSource,
1.161 + uint32_t aChannelNumber, uint32_t aStartInChannel,
1.162 + ErrorResult& aRv)
1.163 +{
1.164 + aSource.ComputeLengthAndData();
1.165 +
1.166 + uint32_t length = aSource.Length();
1.167 + CheckedInt<uint32_t> end = aStartInChannel;
1.168 + end += length;
1.169 + if (aChannelNumber >= NumberOfChannels() ||
1.170 + !end.isValid() || end.value() > mLength) {
1.171 + aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
1.172 + return;
1.173 + }
1.174 +
1.175 + if (!mSharedChannels && JS_GetTypedArrayLength(mJSChannels[aChannelNumber]) != mLength) {
1.176 + // The array was probably neutered
1.177 + aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
1.178 + return;
1.179 + }
1.180 +
1.181 + if (!RestoreJSChannelData(aJSContext)) {
1.182 + aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
1.183 + return;
1.184 + }
1.185 +
1.186 + PodMove(JS_GetFloat32ArrayData(mJSChannels[aChannelNumber]) + aStartInChannel,
1.187 + aSource.Data(), length);
1.188 +}
1.189 +
1.190 +void
1.191 +AudioBuffer::SetRawChannelContents(JSContext* aJSContext, uint32_t aChannel,
1.192 + float* aContents)
1.193 +{
1.194 + PodCopy(JS_GetFloat32ArrayData(mJSChannels[aChannel]), aContents, mLength);
1.195 +}
1.196 +
1.197 +void
1.198 +AudioBuffer::GetChannelData(JSContext* aJSContext, uint32_t aChannel,
1.199 + JS::MutableHandle<JSObject*> aRetval,
1.200 + ErrorResult& aRv)
1.201 +{
1.202 + if (aChannel >= NumberOfChannels()) {
1.203 + aRv.Throw(NS_ERROR_DOM_SYNTAX_ERR);
1.204 + return;
1.205 + }
1.206 +
1.207 + if (!RestoreJSChannelData(aJSContext)) {
1.208 + aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
1.209 + return;
1.210 + }
1.211 +
1.212 + if (mJSChannels[aChannel]) {
1.213 + JS::ExposeObjectToActiveJS(mJSChannels[aChannel]);
1.214 + }
1.215 + aRetval.set(mJSChannels[aChannel]);
1.216 +}
1.217 +
1.218 +static already_AddRefed<ThreadSharedFloatArrayBufferList>
1.219 +StealJSArrayDataIntoThreadSharedFloatArrayBufferList(JSContext* aJSContext,
1.220 + const nsTArray<JSObject*>& aJSArrays)
1.221 +{
1.222 + nsRefPtr<ThreadSharedFloatArrayBufferList> result =
1.223 + new ThreadSharedFloatArrayBufferList(aJSArrays.Length());
1.224 + for (uint32_t i = 0; i < aJSArrays.Length(); ++i) {
1.225 + JS::Rooted<JSObject*> arrayBuffer(aJSContext,
1.226 + JS_GetArrayBufferViewBuffer(aJSContext, aJSArrays[i]));
1.227 + uint8_t* stolenData = arrayBuffer
1.228 + ? (uint8_t*) JS_StealArrayBufferContents(aJSContext, arrayBuffer)
1.229 + : nullptr;
1.230 + if (stolenData) {
1.231 + result->SetData(i, stolenData, reinterpret_cast<float*>(stolenData));
1.232 + } else {
1.233 + return nullptr;
1.234 + }
1.235 + }
1.236 + return result.forget();
1.237 +}
1.238 +
1.239 +ThreadSharedFloatArrayBufferList*
1.240 +AudioBuffer::GetThreadSharedChannelsForRate(JSContext* aJSContext)
1.241 +{
1.242 + if (!mSharedChannels) {
1.243 + for (uint32_t i = 0; i < mJSChannels.Length(); ++i) {
1.244 + if (mLength != JS_GetTypedArrayLength(mJSChannels[i])) {
1.245 + // Probably one of the arrays was neutered
1.246 + return nullptr;
1.247 + }
1.248 + }
1.249 +
1.250 + mSharedChannels =
1.251 + StealJSArrayDataIntoThreadSharedFloatArrayBufferList(aJSContext, mJSChannels);
1.252 + }
1.253 +
1.254 + return mSharedChannels;
1.255 +}
1.256 +
1.257 +size_t
1.258 +AudioBuffer::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
1.259 +{
1.260 + size_t amount = aMallocSizeOf(this);
1.261 + amount += mJSChannels.SizeOfExcludingThis(aMallocSizeOf);
1.262 + if (mSharedChannels) {
1.263 + amount += mSharedChannels->SizeOfExcludingThis(aMallocSizeOf);
1.264 + }
1.265 + return amount;
1.266 +}
1.267 +
1.268 +}
1.269 +}
