blob: 6f3538f1e2f2be625f3206f5d10c25255315f7ad [file] [log] [blame]
/*
* 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.
*/
#include "cobalt/audio/audio_buffer_source_node.h"
#include <algorithm>
#include "cobalt/audio/audio_context.h"
#include "cobalt/audio/audio_node_output.h"
namespace cobalt {
namespace audio {
typedef ::media::ShellAudioBus ShellAudioBus;
// numberOfInputs : 0
// numberOfOutputs : 1
AudioBufferSourceNode::AudioBufferSourceNode(AudioContext* context)
: AudioNode(context), state_(kNone), read_index_(0) {
AudioLock::AutoLock lock(audio_lock());
AddOutput(new AudioNodeOutput(this));
}
AudioBufferSourceNode::~AudioBufferSourceNode() {
AudioLock::AutoLock lock(audio_lock());
DCHECK_EQ(number_of_inputs(), 0u);
RemoveAllOutputs();
}
void AudioBufferSourceNode::set_buffer(
const scoped_refptr<AudioBuffer>& buffer) {
AudioLock::AutoLock lock(audio_lock());
buffer_ = buffer;
}
void AudioBufferSourceNode::Start(double when, double offset,
script::ExceptionState* exception_state) {
Start(when, offset, 0, exception_state);
}
// TODO: Fully implement start and stop method. The starting time is
// based on the current time of AudioContext. We only support start at 0 and
// stop at 0 currently.
void AudioBufferSourceNode::Start(double when, double offset, double duration,
script::ExceptionState* exception_state) {
AudioLock::AutoLock lock(audio_lock());
if (when != 0 || offset != 0 || duration != 0) {
dom::DOMException::Raise(dom::DOMException::kInvalidStateErr,
exception_state);
return;
}
if (state_ != kNone) {
dom::DOMException::Raise(dom::DOMException::kInvalidStateErr,
exception_state);
return;
}
state_ = kStarted;
}
void AudioBufferSourceNode::Stop(double when,
script::ExceptionState* exception_state) {
AudioLock::AutoLock lock(audio_lock());
if (when != 0) {
dom::DOMException::Raise(dom::DOMException::kInvalidStateErr,
exception_state);
return;
}
if (state_ != kStarted) {
dom::DOMException::Raise(dom::DOMException::kInvalidStateErr,
exception_state);
return;
}
state_ = kStoped;
}
scoped_ptr<ShellAudioBus> AudioBufferSourceNode::PassAudioBusFromSource(
int32 number_of_frames) {
// This is called by Audio thread.
audio_lock()->AssertLocked();
if (state_ != kStarted || !buffer_ || buffer_->length() == read_index_) {
return scoped_ptr<ShellAudioBus>();
}
DCHECK_GT(number_of_frames, 0);
int32 frames_to_end = buffer_->length() - read_index_;
number_of_frames = std::min(number_of_frames, frames_to_end);
size_t channels = static_cast<size_t>(buffer_->number_of_channels());
std::vector<float*> audio_buffer;
for (size_t i = 0; i < channels; ++i) {
scoped_refptr<dom::Float32Array> buffer_data =
buffer_->GetChannelData(static_cast<uint32>(i), NULL);
scoped_refptr<dom::Float32Array> sub_array = buffer_data->Subarray(
NULL, read_index_, read_index_ + number_of_frames);
audio_buffer.push_back(sub_array->data());
}
read_index_ += number_of_frames;
scoped_ptr<ShellAudioBus> audio_bus(
new ShellAudioBus(static_cast<size_t>(number_of_frames), audio_buffer));
return audio_bus.Pass();
}
} // namespace audio
} // namespace cobalt