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wavex
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Read WAVE LPCM data
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lib/wavex.ex
defmodule Wavex do
@moduledoc """
Reading a PCM WAVE file.
"""
alias Wavex.{DataChunk, Error, FormatChunk, RIFFHeader}
defstruct [:riff_header, :format_chunk, :data_chunk]
@type t :: %__MODULE__{
riff_header: RIFFHeader.t(),
format_chunk: FormatChunk.t(),
data_chunk: DataChunk.t()
}
@doc ~S"""
Read a PCM WAVE file.
## Examples
iex Wavex.read(<<
...> 0x52, 0x49, 0x46, 0x46, # R I F F
...> 0x24, 0x08, 0x00, 0x00, # 38
...> 0x57, 0x41, 0x56, 0x45, # W A V E
...> 0x66, 0x6D, 0x74, 0x20, # f m t \s
...> 0x10, 0x00, 0x00, 0x00, # 16
...> 0x01, 0x00, 0x02, 0x00, # 1 2
...> 0x22, 0x56, 0x00, 0x00, # 22050
...> 0x88, 0x58, 0x01, 0x00, # 88200
...> 0x04, 0x00, 0x10, 0x00, # 4 16
...> 0x64, 0x61, 0x74, 0x61, # d a t a
...> 0x02, 0x00, 0x00, 0x00, # 2
...> 0x00, 0x00, 0x00, 0x00, # 0
...> 0x00, 0x00, 0x00, 0x00 # 0
...> >>)
{:ok,
%Wavex{
data_chunk: %Wavex.DataChunk{
data: <<0, 0, 0, 0, 0, 0, 0, 0>>,
size: 2
},
format_chunk: %Wavex.FormatChunk{
bits_per_sample: 16,
block_align: 4,
byte_rate: 88_200,
channels: 2,
sample_rate: 22_050
},
riff_header: %Wavex.RIFFHeader{size: 2084}
}}
iex> Wavex.read(<<
...> 0x52, 0x49, 0x46, 0x46, # R I F F
...> 0x24, 0x08, 0x00, 0x00, # 38
...> 0x57, 0x41, 0x56, 0x45, # W A V E
...> 0x66, 0x6D, 0x74, 0x20, # f m t \s
...> 0x10, 0x00, 0x00, 0x00, # 16
...> 0x01, 0x00, 0x01, 0x00, # 1 1
...> 0x11, 0x2B, 0x00, 0x00, # 11025
...> 0x22, 0x56, 0x00, 0x00, # 22050
...> 0x02, 0x00, 0x10, 0x00, # 2 16
...> 0x64, 0x61, 0x74, 0x61, # d a t a
...> 0x02, 0x00, 0x00, 0x00, # 2
...> 0x00, 0x00, 0xFE, 0xFF # 0 0 254 255
...> >>)
{:ok,
%Wavex{
data_chunk: %Wavex.DataChunk{data: <<0, 0, 254, 255>>, size: 2},
format_chunk: %Wavex.FormatChunk{
bits_per_sample: 16,
block_align: 2,
byte_rate: 22050,
channels: 1,
sample_rate: 11025
},
riff_header: %Wavex.RIFFHeader{size: 2084}
}}
"""
@spec read(binary) :: {:ok, t} | {:error, Error.t()}
def read(binary) when is_binary(binary) do
with {:ok, %RIFFHeader{} = riff_header, etc} <- RIFFHeader.read(binary),
{:ok, %FormatChunk{block_align: block_align} = format_chunk, etc} <-
FormatChunk.read(etc),
{:ok, %DataChunk{} = data_chunk} <- DataChunk.read(etc, block_align) do
{:ok, %Wavex{riff_header: riff_header, format_chunk: format_chunk, data_chunk: data_chunk}}
else
{:error, _} = error -> error
end
end
end