| /* |
| * Copyright 2015 Google Inc. All Rights Reserved. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef COBALT_AUDIO_AUDIO_BUFFER_SOURCE_NODE_H_ |
| #define COBALT_AUDIO_AUDIO_BUFFER_SOURCE_NODE_H_ |
| |
| #include <vector> |
| |
| #include "cobalt/audio/audio_buffer.h" |
| #include "cobalt/audio/audio_node.h" |
| #include "cobalt/base/tokens.h" |
| #include "media/base/shell_audio_bus.h" |
| |
| namespace cobalt { |
| namespace audio { |
| |
| // This represents an audio source from an in-memory audio asset in an |
| // AudioBuffer. It is useful for playing short audio assets which require a high |
| // degree of scheduling flexibility (can playback in rhythmically perfect ways). |
| // https://www.w3.org/TR/webaudio/#AudioBufferSourceNode |
| class AudioBufferSourceNode : public AudioNode { |
| typedef ::media::ShellAudioBus ShellAudioBus; |
| |
| public: |
| explicit AudioBufferSourceNode(AudioContext* context); |
| |
| // Web API: AudioBufferSourceNode |
| // |
| // Represents the audio asset to be played. |
| const scoped_refptr<AudioBuffer>& buffer() const { return buffer_; } |
| void set_buffer(const scoped_refptr<AudioBuffer>& buffer); |
| |
| // The Start method is used to schedule a sound to playback at an exact time. |
| // The parameters are used to define the time to start playing based on the |
| // context's timeline. (0 or a time less than the context's current time means |
| // "now"). The parameters are in seconds. |
| void Start(double when, double offset, |
| script::ExceptionState* exception_state); |
| void Start(double when, double offset, double duration, |
| script::ExceptionState* exception_state); |
| |
| // The Stop method is used to schedule a sound to stop playback at an exact |
| // time. |when| is the time to stop playing based on the context's timeline. |
| // (0 or a time less than the context's current time means "now"). |
| // If it hasn't been set explicitly, then the sound will not stop playing |
| // or will stop when the end of the AudioBuffer has been reached. |
| // The parameter is in seconds. |
| void Stop(double when, script::ExceptionState* exception_state); |
| |
| // A property used to set the EventHandler for the ended event that is |
| // dispatched to AudioBufferSourceNode node types. When the playback of the |
| // buffer for an AudioBufferSourceNode is finished, an event of type Event |
| // will be dispatched to the event handler. |
| const EventListenerScriptObject* onended() const { |
| return GetAttributeEventListener(base::Tokens::ended()); |
| } |
| void set_onended(const EventListenerScriptObject& event_listener) { |
| SetAttributeEventListener(base::Tokens::ended(), event_listener); |
| } |
| |
| scoped_ptr<ShellAudioBus> PassAudioBusFromSource( |
| int32 number_of_frames) OVERRIDE; |
| |
| DEFINE_WRAPPABLE_TYPE(AudioBufferSourceNode); |
| |
| protected: |
| ~AudioBufferSourceNode() OVERRIDE; |
| |
| private: |
| enum State { |
| kNone, |
| kStarted, |
| kStoped, |
| }; |
| |
| scoped_refptr<AudioBuffer> buffer_; |
| |
| State state_; |
| |
| // |read_index_| is a sample-frame index into out buffer representing the |
| // current playback position. |
| int32 read_index_; |
| |
| DISALLOW_COPY_AND_ASSIGN(AudioBufferSourceNode); |
| }; |
| |
| } // namespace audio |
| } // namespace cobalt |
| |
| #endif // COBALT_AUDIO_AUDIO_BUFFER_SOURCE_NODE_H_ |