I started an iex session and ran the code snippet code in separate blocks. All is well until the last block calling “start_link”, then there is a warning and an error:
7:14:06.609 [warning] The on_load function for module Elixir.Membrane.PortAudio.Sink.Native.Nif returned:
{%RuntimeError{
message: "Bundlex cannot load nif :sink of app :membrane_portaudio_plugin\nfrom \"/home/michael_intandem/.cache/mix/installs/elixir-1.16.0-erts-14.1.1/296ba109bd28b18599af0e6d5e8838bb/_build/dev/lib/membrane_portaudio_plugin/priv/bundlex/nif/sink\", check bundlex.exs file for information about nifs.\nReason: :load_failed, Failed to load NIF library /home/michael_intandem/.cache/mix/installs/elixir-1.16.0-erts-14.1.1/296ba109bd28b18599af0e6d5e8838bb/_build/dev/lib/membrane_portaudio_plugin/priv/bundlex/nif/sink: 'libssl.so.3: cannot open shared object file: No such file or directory'\n"
},
[
{Membrane.PortAudio.Sink.Native.Nif, :load_nif, 0,
[
file: ~c"lib/membrane_portaudio_plugin/sink_native.ex",
line: 1,
error_info: %{...}
]},
{:code_server, :"-handle_on_load/5-fun-0-", 1,
[file: ~c"code_server.erl", line: 1398]}
]}
07:14:06.586 [error] Process #PID<0.313.0> raised an exception
** (RuntimeError) Bundlex cannot load nif :sink of app :membrane_portaudio_plugin
from "/home/michael_intandem/.cache/mix/installs/elixir-1.16.0-erts-14.1.1/296ba109bd28b18599af0e6d5e8838bb/_build/dev/lib/membrane_portaudio_plugin/priv/bundlex/nif/sink", check bundlex.exs file for information about nifs.
Reason: :load_failed, Failed to load NIF library /home/michael_intandem/.cache/mix/installs/elixir-1.16.0-erts-14.1.1/296ba109bd28b18599af0e6d5e8838bb/_build/dev/lib/membrane_portaudio_plugin/priv/bundlex/nif/sink: 'libssl.so.3: cannot open shared object file: No such file or directory'
(membrane_portaudio_plugin 0.18.3) lib/membrane_portaudio_plugin/sink_native.ex:1: Membrane.PortAudio.Sink.Native.Nif.load_nif/0
(kernel 9.1) code_server.erl:1398: anonymous fn/1 in :code_server.handle_on_load/5
I am running:
❯ asdf current
elixir 1.16.0-otp-26 /home/michael/.tool-versions
erlang 26.1.2 /home/michael/.tool-versions
I also tried an earlier 1.15 version with the same result.
Here’s something that I got to work in IEx. (It is up to step 3.)
# Run as: iex --dot-iex path/to/notebook.exs
# Title: Membrane tutorial
Mix.install([
:membrane_hackney_plugin,
:membrane_mp3_mad_plugin,
:membrane_portaudio_plugin
])
# ── Section ──
defmodule VolumeKnob do
@moduledoc """
Membrane filter that changes the audio volume
by the gain passed via options.
"""
use Membrane.Filter
alias Membrane.RawAudio
def_input_pad(:input, accepted_format: RawAudio, flow_control: :auto)
def_output_pad(:output, accepted_format: RawAudio, flow_control: :auto)
def_options(
gain: [
spec: float(),
description: """
The factor by which the volume will be changed.
A gain smaller than 1 reduces the volume and gain
greater than 1 increases it.
"""
]
)
@impl true
def handle_init(_ctx, options) do
{[], %{gain: options.gain}}
end
@impl true
def handle_buffer(:input, buffer, ctx, state) do
stream_format = ctx.pads.input.stream_format
sample_size = RawAudio.sample_size(stream_format)
payload =
for <<sample::binary-size(sample_size) <- buffer.payload>>, into: <<>> do
value = RawAudio.sample_to_value(sample, stream_format)
scaled_value = round(value * state.gain)
RawAudio.value_to_sample(scaled_value, stream_format)
end
buffer = %Membrane.Buffer{buffer | payload: payload}
{[buffer: {:output, buffer}], state}
end
end
defmodule MyPipeline do
use Membrane.Pipeline
@impl true
def handle_init(_ctx, path_to_mp3) do
spec =
child(%Membrane.Hackney.Source{
location: path_to_mp3,
hackney_opts: [follow_redirect: true]
})
|> via_out(:output)
|> via_in(:input)
|> child(Membrane.MP3.MAD.Decoder)
|> via_out(:output)
|> via_in(:input)
|> child(%VolumeKnob{gain: 0.9})
|> via_out(:output)
|> via_in(:input)
|> child(Membrane.PortAudio.Sink)
{[spec: spec], %{}}
end
end
mp3_url =
"https://raw.githubusercontent.com/membraneframework/membrane_demo/master/simple_pipeline/sample.mp3"
Membrane.Pipeline.start_link(MyPipeline, mp3_url)
Also, if you haven’t had a chance to check out LiveBook, it’s an amazing notebook like Jupyter is for Python. Great option for stuff you might be reaching for iex atm.
I was able to get it working in LiveBook as well. Here’s a link to download it.
I started this effort in LiveBook but got the same error there. I removed LiveBook as a layer of complexity and went with iex route.
I downloaded your LiveBook file and run it with the same result.
10:38:00.771 [error] Process #PID<0.435.0> on node :"nejwjxlb-livebook_a4punmsz@hermes" raised an exception
** (RuntimeError) Bundlex cannot load nif :sink of app :membrane_portaudio_plugin
from "/home/michael_intandem/.cache/mix/installs/elixir-1.16.0-erts-14.1.1/296ba109bd28b18599af0e6d5e8838bb/_build/dev/lib/membrane_portaudio_plugin/priv/bundlex/nif/sink", check bundlex.exs file for information about nifs.
Reason: :load_failed, Failed to load NIF library /home/michael_intandem/.cache/mix/installs/elixir-1.16.0-erts-14.1.1/296ba109bd28b18599af0e6d5e8838bb/_build/dev/lib/membrane_portaudio_plugin/priv/bundlex/nif/sink: 'libssl.so.3: cannot open shared object file: No such file or directory'
(membrane_portaudio_plugin 0.18.3) lib/membrane_portaudio_plugin/sink_native.ex:1: Membrane.PortAudio.Sink.Native.Nif.load_nif/0
(kernel 9.1) code_server.erl:1398: anonymous fn/1 in :code_server.handle_on_load/5
10:38:00.772 [warning] The on_load function for module Elixir.Membrane.PortAudio.Sink.Native.Nif returned:
{%RuntimeError{
message: "Bundlex cannot load nif :sink of app :membrane_portaudio_plugin\nfrom \"/home/michael_intandem/.cache/mix/installs/elixir-1.16.0-erts-14.1.1/296ba109bd28b18599af0e6d5e8838bb/_build/dev/lib/membrane_portaudio_plugin/priv/bundlex/nif/sink\", check bundlex.exs file for information about nifs.\nReason: :load_failed, Failed to load NIF library /home/michael_intandem/.cache/mix/installs/elixir-1.16.0-erts-14.1.1/296ba109bd28b18599af0e6d5e8838bb/_build/dev/lib/membrane_portaudio_plugin/priv/bundlex/nif/sink: 'libssl.so.3: cannot open shared object file: No such file or directory'\n"
},
[
{Membrane.PortAudio.Sink.Native.Nif, :load_nif, 0,
[
file: ~c"lib/membrane_portaudio_plugin/sink_native.ex",
line: 1,
error_info: %{...}
]},
{:code_server, :"-handle_on_load/5-fun-0-", 1,
[file: ~c"code_server.erl", line: 1398]}
]}
I am on Pop_OS! (Ubuntu) 20.04.
Are you using “asdf” for your elixir and erlang installs?
@michaelwa can you check whether functions from the :crypto module work for you? If so, we probably fail to find OpenSSL. If not, it’s indeed missing, but we probably can emit a better error. Anyway, installing OpenSSL may indeed help
I think the root of the problem is my OS version. It is an Ubuntu 20.04 derivative (Pop_OS! 20.04). I do have openssl installed but it is version 1.1.1.
❯ openssl version
OpenSSL 1.1.1f 31 Mar 2020
The missing file, libssl.so.3, is part of the openssl3-dev package and does not seem to be compatible with this version of Ubuntu.
I think I am out of luck until I can upgrade the OS.
Ok, so it seems possible to make it work with OpenSSL 1.1, however, Ubuntu 20.04 uses an old version of GlibC as well, which is harder to support. Thus, it seems that until you upgrade the OS, you need to disable the precompiled deps completely:
^ This is possible since the latest release of Bundlex, 1.4.5, so make sure it’s up to date. Then, install all the dependencies manually. For the example in the tutorial, you’ll need:
