97 lines
2.9 KiB
Lua
97 lines
2.9 KiB
Lua
#!/usr/bin/wpexec
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--
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-- WirePlumber
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--
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-- Copyright © 2022 Collabora Ltd.
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-- @author George Kiagiadakis <george.kiagiadakis@collabora.com>
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--
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-- SPDX-License-Identifier: MIT
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--
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-- This is an example of how to load a pipewire module that takes a JSON
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-- string as arguments.
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--
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-- For illustration purposes, this loads module-filter-chain with a 6-band
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-- equalizer. This is the same configuration found in the sink-eq6.conf
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-- file that can be found in pipewire's source tree.
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-----------------------------------------------------------------------------
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-- For illustration purposes, we declare 'args' here as a native lua table,
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-- we populate it in multiple steps and we transform it later to a json object
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local args = {
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["node.description"] = "Equalizer Sink",
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["media.name"] = "Equalizer Sink",
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["audio.channels"] = 2,
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["audio.position"] = Json.Array { "FL", "FR" },
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}
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args["filter.graph"] = Json.Object {
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nodes = Json.Array {
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Json.Object {
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type = "builtin",
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name = "eq_band_1",
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label = "bq_lowshelf",
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control = Json.Object { Freq = 100.0, Q = 1.0, Gain = 0.0 },
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},
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Json.Object {
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type = "builtin",
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name = "eq_band_2",
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label = "bq_peaking",
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control = Json.Object { Freq = 100.0, Q = 1.0, Gain = 0.0 },
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},
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Json.Object {
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type = "builtin",
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name = "eq_band_3",
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label = "bq_peaking",
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control = Json.Object { Freq = 500.0, Q = 1.0, Gain = 0.0 },
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},
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Json.Object {
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type = "builtin",
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name = "eq_band_4",
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label = "bq_peaking",
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control = Json.Object { Freq = 2000.0, Q = 1.0, Gain = 0.0 },
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},
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Json.Object {
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type = "builtin",
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name = "eq_band_5",
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label = "bq_peaking",
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control = Json.Object { Freq = 5000.0, Q = 1.0, Gain = 0.0 },
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},
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Json.Object {
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type = "builtin",
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name = "eq_band_6",
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label = "bq_highshelf",
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control = Json.Object { Freq = 5000.0, Q = 1.0, Gain = 0.0 },
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},
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},
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links = Json.Array {
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Json.Object { output = "eq_band_1:Out", input = "eq_band_2:In" },
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Json.Object { output = "eq_band_2:Out", input = "eq_band_3:In" },
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Json.Object { output = "eq_band_3:Out", input = "eq_band_4:In" },
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Json.Object { output = "eq_band_4:Out", input = "eq_band_5:In" },
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Json.Object { output = "eq_band_5:Out", input = "eq_band_6:In" },
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},
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}
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args["capture.props"] = Json.Object {
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["node.name"] = "effect_input.eq6",
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["media.class"] = "Audio/Sink",
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}
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args["playback.props"] = Json.Object {
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["node.name"] = "effect_output.eq6",
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["node.passive"] = true,
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}
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-- Transform 'args' to a json object here
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local args_json = Json.Object(args)
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-- and get the final JSON as a string from the json object
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local args_string = args_json:get_data()
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local properties = {}
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print("Loading module-filter-chain with arguments = ")
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print(args_string)
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filter_chain = LocalModule("libpipewire-module-filter-chain", args_string, properties)
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