DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Implementation

Mercurial (d38398e5144e)

VCS Links

AudioParam

Macros

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef AudioParam_h_
#define AudioParam_h_

#include "AudioParamTimeline.h"
#include "nsWrapperCache.h"
#include "nsCycleCollectionParticipant.h"
#include "AudioNode.h"
#include "mozilla/dom/TypedArray.h"
#include "WebAudioUtils.h"
#include "js/TypeDecls.h"

namespace mozilla {

namespace dom {

class AudioParam final : public nsWrapperCache,
                         public AudioParamTimeline
{
  virtual ~AudioParam();

public:
  AudioParam(AudioNode* aNode,
             uint32_t aIndex,
             const char* aName,
             float aDefaultValue,
             float aMinValue = -std::numeric_limits<float>::infinity(),
             float aMaxValue = std::numeric_limits<float>::infinity());

  NS_IMETHOD_(MozExternalRefCountType) AddRef(void);
  NS_IMETHOD_(MozExternalRefCountType) Release(void);
  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(AudioParam)

  AudioContext* GetParentObject() const
  {
    return mNode->Context();
  }

  JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;

  // We override SetValueCurveAtTime to convert the Float32Array to the wrapper
  // object.
  AudioParam* SetValueCurveAtTime(const Float32Array& aValues,
                                  double aStartTime,
                                  double aDuration,
                                  ErrorResult& aRv)
  {
    if (!WebAudioUtils::IsTimeValid(aStartTime)) {
      aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
      return this;
    }
    aValues.ComputeLengthAndData();

    aStartTime = std::max(aStartTime, GetParentObject()->CurrentTime());
    EventInsertionHelper(aRv, AudioTimelineEvent::SetValueCurve,
                         aStartTime, 0.0f, 0.0f, aDuration, aValues.Data(),
                         aValues.Length());
    return this;
  }

  void SetValue(float aValue)
  {
    AudioTimelineEvent event(AudioTimelineEvent::SetValue, 0.0f, aValue);

    ErrorResult rv;
    if (!ValidateEvent(event, rv)) {
      MOZ_ASSERT(false, "This should not happen, "
                        "setting the value should always work");
      return;
    }

    AudioParamTimeline::SetValue(aValue);

    SendEventToEngine(event);
  }

  AudioParam* SetValueAtTime(float aValue, double aStartTime, ErrorResult& aRv)
  {
    if (!WebAudioUtils::IsTimeValid(aStartTime)) {
      aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
      return this;
    }
    aStartTime = std::max(aStartTime, GetParentObject()->CurrentTime());
    EventInsertionHelper(aRv, AudioTimelineEvent::SetValueAtTime,
                         aStartTime, aValue);

    return this;
  }

  AudioParam* LinearRampToValueAtTime(float aValue, double aEndTime,
                                      ErrorResult& aRv)
  {
    if (!WebAudioUtils::IsTimeValid(aEndTime)) {
      aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
      return this;
    }
    aEndTime = std::max(aEndTime, GetParentObject()->CurrentTime());
    EventInsertionHelper(aRv, AudioTimelineEvent::LinearRamp, aEndTime, aValue);
    return this;
  }

  AudioParam* ExponentialRampToValueAtTime(float aValue, double aEndTime,
                                           ErrorResult& aRv)
  {
    if (!WebAudioUtils::IsTimeValid(aEndTime)) {
      aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
      return this;
    }
    aEndTime = std::max(aEndTime, GetParentObject()->CurrentTime());
    EventInsertionHelper(aRv, AudioTimelineEvent::ExponentialRamp,
                         aEndTime, aValue);
    return this;
  }

  AudioParam* SetTargetAtTime(float aTarget, double aStartTime,
                              double aTimeConstant, ErrorResult& aRv)
  {
    if (!WebAudioUtils::IsTimeValid(aStartTime) ||
        !WebAudioUtils::IsTimeValid(aTimeConstant)) {
      aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
      return this;
    }
    aStartTime = std::max(aStartTime, GetParentObject()->CurrentTime());
    EventInsertionHelper(aRv, AudioTimelineEvent::SetTarget,
                         aStartTime, aTarget,
                         aTimeConstant);

    return this;
  }

  AudioParam* CancelScheduledValues(double aStartTime, ErrorResult& aRv)
  {
    if (!WebAudioUtils::IsTimeValid(aStartTime)) {
      aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
      return this;
    }

    aStartTime = std::max(aStartTime, GetParentObject()->CurrentTime());

    // Remove some events on the main thread copy.
    AudioEventTimeline::CancelScheduledValues(aStartTime);

    AudioTimelineEvent event(AudioTimelineEvent::Cancel, aStartTime, 0.0f);

    SendEventToEngine(event);

    return this;
  }

  uint32_t ParentNodeId()
  {
    return mNode->Id();
  }

  void GetName(nsAString& aName)
  {
    aName.AssignASCII(mName);
  }

  float DefaultValue() const
  {
    return mDefaultValue;
  }

  float MinValue() const
  {
    return mMinValue;
  }

  float MaxValue() const
  {
    return mMaxValue;
  }

  const nsTArray<AudioNode::InputNode>& InputNodes() const
  {
    return mInputNodes;
  }

  void RemoveInputNode(uint32_t aIndex)
  {
    mInputNodes.RemoveElementAt(aIndex);
  }

  AudioNode::InputNode* AppendInputNode()
  {
    return mInputNodes.AppendElement();
  }

  // May create the stream if it doesn't exist
  MediaStream* Stream();

  size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const override
  {
    size_t amount = AudioParamTimeline::SizeOfExcludingThis(aMallocSizeOf);
    // Not owned:
    // - mNode

    // Just count the array, actual nodes are counted in mNode.
    amount += mInputNodes.ShallowSizeOfExcludingThis(aMallocSizeOf);

    if (mNodeStreamPort) {
      amount += mNodeStreamPort->SizeOfIncludingThis(aMallocSizeOf);
    }

    return amount;
  }

  size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const override
  {
    return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
  }

private:
  void EventInsertionHelper(ErrorResult& aRv,
                            AudioTimelineEvent::Type aType,
                            double aTime, float aValue,
                            double aTimeConstant = 0.0,
                            float aDuration = 0.0,
                            const float* aCurve = nullptr,
                            uint32_t aCurveLength = 0)
  {
    AudioTimelineEvent event(aType, aTime, aValue,
                             aTimeConstant, aDuration, aCurve, aCurveLength);

    if (!ValidateEvent(event, aRv)) {
      return;
    }

    AudioEventTimeline::InsertEvent<double>(event);

    SendEventToEngine(event);

    CleanupOldEvents();
  }

  void CleanupOldEvents();

  void SendEventToEngine(const AudioTimelineEvent& aEvent);

  void DisconnectFromGraphAndDestroyStream();

  nsCycleCollectingAutoRefCnt mRefCnt;
  NS_DECL_OWNINGTHREAD
  RefPtr<AudioNode> mNode;
  // For every InputNode, there is a corresponding entry in mOutputParams of the
  // InputNode's mInputNode.
  nsTArray<AudioNode::InputNode> mInputNodes;
  const char* mName;
  // The input port used to connect the AudioParam's stream to its node's stream
  RefPtr<MediaInputPort> mNodeStreamPort;
  const uint32_t mIndex;
  const float mDefaultValue;
  const float mMinValue;
  const float mMaxValue;
};

} // namespace dom
} // namespace mozilla

#endif