const int num_samples = static_cast<int>((sample_rate_ * duration) /
base::TimeDelta::FromSeconds(1));
scoped_ptr<AudioBus> bus(AudioBus::Create(num_channels_, num_samples));
- source_.OnMoreData(bus.get(), AudioBuffersState());
+ source_.OnMoreData(bus.get(), 0);
bus->Scale(volume_);
return bus.Pass();
}