Method: WaveFile::Writer#write

Defined in:
lib/wavefile/writer.rb

#write(buffer) ⇒ Object

Public: Appends the sample data in the given Buffer to the end of the wave file.

buffer - A Buffer instance containing the sample data to be written to the file. The format of the Buffer doesn't have to match the format of the file being written to by the Writer - if it doesn't match, it will automatically be converted to the correct format.

Examples

square_wave_samples = ([0.5] * 100) + ([-0.5] * 100)
buffer = Buffer.new(square_wave_samples, Format.new(1, :float, 44100))

Writer.new("my_file.wav", Format.new(:stereo, :pcm_16, 44100)) do |writer|
writer.write(buffer)
end

writer = Writer.new("my_file.wav", Format.new(:stereo, :pcm_16, 44100))
writer.write(buffer)
writer.close
# This will raise WriterClosedError because the Writer has already been closed.
writer.write(buffer)

Returns the number of sample frames that have been written to the file so far.

Raises WriterClosedError if the Writer has been closed.

Raises BufferConversionError if the Buffer can't be converted to the Writer's format.



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# File 'lib/wavefile/writer.rb', line 100

def write(buffer)
  if @closed
    raise WriterClosedError
  end

  samples = buffer.convert(@format).samples

  if @format.bits_per_sample == 24 && @format.sample_format == :pcm
    samples.flatten.each do |sample|
      @io.write([sample].pack("l<X"))
    end
  else
    @io.write(samples.flatten.pack(@pack_code))
  end

  @total_sample_frames += samples.length
end