class Aubio::Onsets
Public Class Methods
new(aubio_source, params)
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# File lib/aubio/onsets.rb, line 5 def initialize(aubio_source, params) # TODO: cleanup param dups @sample_rate = params[:sample_rate] || 44_100 @window_size = params[:window_size] || 1024 @hop_size = params[:hop_size] || 512 @source = aubio_source @onset = Api.new_aubio_onset('default', @window_size, @hop_size, @sample_rate) Api.aubio_onset_set_minioi_ms(@onset, 12.0) Api.aubio_onset_set_threshold(@onset, 0.3) # create output for source @sample_buffer = Api.new_fvec(@hop_size) # create output for pitch and beat @out_fvec = Api.new_fvec(1) end
Public Instance Methods
each() { |output| ... }
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# File lib/aubio/onsets.rb, line 22 def each return enum_for(:each) unless block_given? total_frames_counter = 0 read_buffer = FFI::MemoryPointer.new(:int) loop do # Perform onset calculation Api.aubio_source_do(@source, @sample_buffer, read_buffer) Api.aubio_onset_do(@onset, @sample_buffer, @out_fvec) # Retrieve result onset_new_peak = Api.fvec_get_sample(@out_fvec, 0) no_of_bytes_read = read_buffer.read_int total_frames_counter += no_of_bytes_read if onset_new_peak > 0.0 onset_seconds = Api.aubio_onset_get_last_s(@onset) onset_milliseconds = Api.aubio_onset_get_last_ms(@onset) output = { s: onset_seconds, ms: onset_milliseconds, start: (onset_seconds == 0.0 ? 1 : 0), end: 0 } yield output end next unless no_of_bytes_read != @hop_size # there's no more audio to look at # Let's output one last onset to mark the end of the file total_time = total_frames_counter.to_f / @sample_rate.to_f output = { s: total_time, ms: total_time / 1000.0, start: 0, end: 1 } yield output # clean up Api.del_aubio_onset(@onset) Api.del_fvec(@sample_buffer) Api.del_fvec(@out_fvec) break end end