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47 lines
1.3 KiB
Elixir
47 lines
1.3 KiB
Elixir
defmodule LiveBeats.MP3Stat do
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alias LiveBeats.MP3Stat
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defstruct duration: 0, path: nil
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def to_mmss(duration) when is_integer(duration) do
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hours = div(duration, 60 * 60)
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minutes = div(duration - (hours * 60 * 60), 60)
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seconds = rem(duration - (hours * 60 * 60) - (minutes * 60), 60)
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[minutes, seconds]
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|> Enum.map(fn count -> String.pad_leading("#{count}", 2, ["0"]) end)
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|> Enum.join(":")
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end
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def parse(path) do
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args = ["-v", "quiet", "-stats", "-i", path, "-f", "null", "-"]
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# "size=N/A time=00:03:00.00 bitrate=N/A speed= 674x"
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case System.cmd("ffmpeg", args, stderr_to_stdout: true) do
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{output, 0} -> parse_output(output, path)
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{_, 1} -> {:error, :bad_file}
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other -> {:error, other}
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end
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end
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defp parse_output(output, path) do
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with %{"time" => time} <- Regex.named_captures(~r/.*time=(?<time>[^\s]+).*/, output),
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[hours, minutes, seconds, _milliseconds] <- ints(String.split(time, [":", "."])) do
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duration = hours * 60 * 60 + minutes * 60 + seconds
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{:ok, %MP3Stat{duration: duration, path: path}}
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else
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_ -> {:error, :bad_duration}
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end
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end
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defp ints(strings) when is_list(strings) do
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Enum.flat_map(strings, fn str ->
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case Integer.parse(str) do
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{int, ""} -> [int]
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{_, _} -> []
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:error -> []
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end
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end)
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end
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end
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