83 lines
1.9 KiB
Julia
83 lines
1.9 KiB
Julia
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#### SinOsc ####
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# Generates a sin tone at the given frequency
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type SinOsc <: AudioNode
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freq::Real
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phase::FloatingPoint
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function SinOsc(freq::Real)
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new(freq, 0.0)
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end
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end
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function render(node::SinOsc, device_input::AudioBuf, info::DeviceInfo)
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phase = AudioSample[1:info.buf_size] * 2pi * node.freq / info.sample_rate
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phase += node.phase
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node.phase = phase[end]
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return sin(phase)
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end
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#### AudioMixer ####
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# Mixes a set of inputs equally
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type AudioMixer <: AudioNode
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mix_inputs::Array{AudioNode}
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function AudioMixer{T <: AudioNode}(mix_inputs::Array{T})
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new(mix_inputs)
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end
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function AudioMixer()
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new(AudioNode[])
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end
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end
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function render(node::AudioMixer, device_input::AudioBuf, info::DeviceInfo)
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# TODO: we may want to pre-allocate this buffer and share between render
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# calls
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mix_buffer = zeros(AudioSample, info.buf_size)
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for in_node in node.mix_inputs
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mix_buffer += render(in_node, device_input, info)
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end
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return mix_buffer
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end
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#### Array Player ####
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# Plays a AudioBuf by rendering it out piece-by-piece
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type ArrayPlayer <: AudioNode
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arr::AudioBuf
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arr_index::Int
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function ArrayPlayer(arr::AudioBuf)
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new(arr, 1)
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end
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end
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function render(node::ArrayPlayer, device_input::AudioBuf, info::DeviceInfo)
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i = node.arr_index
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range_end = min(i + info.buf_size-1, length(node.arr))
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output = node.arr[i:range_end]
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if length(output) < info.buf_size
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output = vcat(output, zeros(AudioSample, info.buf_size - length(output)))
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end
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node.arr_index = range_end + 1
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return output
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end
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#### AudioInput ####
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# Renders incoming audio input from the hardware
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type AudioInput <: AudioNode
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channel::Int
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end
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function render(node::AudioInput, device_input::AudioBuf, info::DeviceInfo)
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@assert size(device_input, 1) == info.buf_size
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return device_input[:, node.channel]
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end
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