View Source Membrane Opus plugin
Opus encoder and decoder.
It is a part of Membrane Multimedia Framework.
installation
Installation
The package can be installed by adding membrane_opus_plugin
to your list of dependencies in mix.exs
:
def deps do
[
{:membrane_opus_plugin, "~> 0.17.1"}
]
end
This package depends on libopus library.
ubuntu
Ubuntu
sudo apt-get install libopus-dev
arch-manjaro
Arch/Manjaro
pacman -S opus
macos
MacOS
brew install opus
macos-m1-m2-apple-silicon
MacOS M1/M2 (Apple silicon)
On Apple M1/M2 chips, one needs to export variables:
export C_INCLUDE_PATH=$C_INCLUDE_PATH:$(brew --cellar)/opus/1.3.1/include
export LIBRARY_PATH=$LIBRARY_PATH:$(brew --cellar)/opus/1.3.1/lib
On different local setups, directory and version names may differ.
usage
Usage
encoder
Encoder
The pipeline encodes a sample raw file and saves it as an opus file:
defmodule Membrane.ReleaseTest.Pipeline do
use Membrane.Pipeline
alias Membrane.RawAudio
@input_filename "/tmp/input.raw"
@output_filename "/tmp/output.opus"
@impl true
def handle_init(_ctx, _options) do
structure =
child(:source, %Membrane.File.Source{
location: @input_filename
})
|> child(:encoder, %Membrane.Opus.Encoder{
application: :audio,
input_stream_format: %RawAudio{
channels: 2,
sample_format: :s16le,
sample_rate: 48_000
}
})
|> child(:parser, %Membrane.Opus.Parser{delimitation: :delimit})
|> child(:sink, %Membrane.File.Sink{
location: @output_filename
})
{[spec: structure], %{}}
end
end
Opus audio generally needs to be packaged in an Ogg container in order to be played by a
media player. See Membrane.Ogg.Payloader
in the Membrane Ogg Plugin.
decoder
Decoder
The pipeline parses, decodes a sample opus file and then saves it as a raw file:
defmodule Membrane.ReleaseTest.Pipeline2 do
use Membrane.Pipeline
@input_filename "/tmp/input.raw"
@output_filename "/tmp/output.opus"
@impl true
def handle_init(_ctx, _options) do
structure =
child(:source, %Membrane.File.Source{
location: @input_filename
})
|> child(:parser, Membrane.Opus.Parser)
|> child(:opus, Membrane.Opus.Decoder)
|> child(:sink, %Membrane.File.Sink{
location: @output_filename
})
{[spec: structure], %{}}
end
end
copyright-and-license
Copyright and License
Copyright 2019, Software Mansion
Licensed under the Apache License, Version 2.0