71 lines
1.8 KiB
Elixir
71 lines
1.8 KiB
Elixir
defmodule MPEGAudioFrameParser.Example do
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require Logger
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def run(path_to_mp3, block_size \\ 2048) do
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# start our test process:
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MPEGAudioFrameParser.start_link()
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# open the provided file:
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{:ok, file} = File.open(path_to_mp3, [:read, :binary])
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# and start to read blocks of data:
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read_bytes(file, block_size, 0, 0, 0)
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end
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defp read_bytes(file, block_size, total_packets, total_frames, total_bytes_processed) do
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IO.binread(file, block_size)
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|> handle_read(file, block_size, total_packets + 1, total_frames, total_bytes_processed)
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end
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defp handle_read(:eof, _file, _block_size, total_packets, total_frames, total_bytes_processed) do
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Logger.info(
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"End of file detected. Parsed #{total_frames} MP3 frames from #{total_packets} packets of data, total bytes processed #{
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total_bytes_processed
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}"
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)
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end
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defp handle_read(
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{:error, reason},
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_file,
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_block_size,
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_total_packets,
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_total_frames,
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_total_bytes_processed
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) do
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Logger.error("Error reading file: #{reason}")
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exit(:shutdown)
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end
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defp handle_read(data, file, block_size, total_packets, total_frames, total_bytes_processed) do
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frames = MPEGAudioFrameParser.add_packet(data)
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check_frames(frames)
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read_bytes(
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file,
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block_size,
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total_packets,
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total_frames + length(frames),
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total_byte_size(frames, total_bytes_processed)
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)
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end
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defp check_frames([]), do: nil
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defp check_frames(frames) do
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[head | tail] = frames
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print_frame(head)
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check_frames(tail)
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end
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defp print_frame(_frame) do
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end
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defp total_byte_size([], total), do: total
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defp total_byte_size(list, total) do
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[head | tail] = list
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total_byte_size(tail, total + byte_size(head.data))
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end
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end
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