Add LADSPA support, add instructions for linux, fix compilation on li…

…nux.

- Add LADSPA support to load plugin into pulseaudio.
- Add instructions for working with pulseaudio.
- Fix compilation on linux.
- Updated readme.

CMakeLists.txt

@@ -6,3 +6,4 @@ add_subdirectory(src/rnnoise)
 add_subdirectory(src/common)
 add_subdirectory(src/vst_plugin)
 add_subdirectory(src/lv2_plugin)
+add_subdirectory(src/ladspa_plugin)

README.md

@@ -1,6 +1,6 @@
-# VST Noise Suppression Plugin
+# Real-time Noise Suppression Plugin (VST2, LV2, LADSPA)
 
-A real-time noise suppression VST and LV2 plugin for voice based on [Xiph's RNNoise](https://github.com/xiph/rnnoise). [More info about the base library](https://people.xiph.org/~jm/demo/rnnoise/).
+A real-time noise suppression plugin for voice based on [Xiph's RNNoise](https://github.com/xiph/rnnoise). [More info about the base library](https://people.xiph.org/~jm/demo/rnnoise/).
 
 ## About
 
@@ -12,32 +12,75 @@ The plugin is made to work with 1 channel, 16 bit, 48000 Hz audio input. Other s
 
 ## How-to
 
-### Windows + Equalizer APO
+### Windows + Equalizer APO (VST2)
+
 To check or change mic settings go to "Recording devices" -> "Recording" -> "Properties" of the target mic -> "Advanced".
 
 To enable the plugin in Equalizer APO select "Plugins" -> "VST Plugin" and specify the plugin dll.
 
 ### Linux
 
-Testing required.
+#### Pulseaudio
+
+The idea is:
+
+- Create a sink from which apps will take audio later and which will be the end think in the chain.
+- Load the plugin which outputs to already created sink ('sink_master' parameter) and has input sink ('sink_name' parameter, sink will be created). 
+- Create loopback from microphone ('source') to input sink of plugin ('sink') with 1 channel.
+
+
+```
+pacmd load-module module-null-sink sink_name=mic_denoised_out  
+
+pacmd load-module module-ladspa-sink sink_name=mic_raw_in sink_master=mic_denoised_out label=noise_suppressor plugin=librnnoise_ladspa_x64.so
+
+pacmd load-module module-loopback source=your_mic_name sink=mic_raw_in channels=1
+```
+
+This should be executed every time pulse audio is launched. This can be done by creating file in ~/.config/pulse/default.pa with:
+
+```
+.include /etc/pulse/default.pa
+
+load-module module-null-sink sink_name=mic_denoised_out  
+load-module module-ladspa-sink sink_name=mic_raw_in sink_master=mic_denoised_out label=noise_suppressor plugin=librnnoise_ladspa_x64.so
+load-module module-loopback source=your_mic_name sink=mic_raw_in channels=1
+
+set-default-source mic_denoised_out.monitor
+```
+
+Your mic name can be found by:
+
+```
+pacmd list-sources
+```
+
+You may still need to set correct input for application, this can be done in audio mixer panel (if you have one) in 'Recording' tab where you should set 'Monitor of Null Output' as source.
+
+Useful detailed info about pulseaudio logic [toadjaune/pulseaudio-config](https://github.com/toadjaune/pulseaudio-config).
+
+The [thread](https://bugs.freedesktop.org/show_bug.cgi?id=101043) which helped me with how to post-process mic output and make it available to applications.
 
 ## Status
 
-The plugin is tested with Equalizer APO v1.2 x64 (open source system-wide equalizer for Windows). It is a minimal proof-of-concept work.
+The plugin is tested with Equalizer APO v1.2 x64 (open source system-wide equalizer for Windows) and tested with pulse audio on arch linux.
 
 I'm not associated with the original work in any way and have only superficial understanding of it. The original author will probably create something better out of their work but for now I don't see any analogs with similar capabilities so I have created a usable one.
 
 ## Developing
 
-The plugin is built with gcc in mingw environment for x32 and x64 architectures, the current cmake project is made for such environment and may need changes in order to support other ones.
-
 VST sdk files aren't shipped here due to their license. You need to download VST sdk and copy several files to src/pluginterfaces/vst2.x/ and to src/vst2.x/. You can find sdk [here](https://www.steinberg.net/en/company/developers.html).
 
-LV2 sdk files are 
+LV2 and LADSPA sdk files are in repository.
+
+All improvements are welcomed!
 
 ## ☑ TODO
 
-- [X] Create LV2 plugin.
+- [X] Create LV2 plugin. (Untested)
+- [X] Create LADSPA plugin.
+- [X] Create correct setup with pulseaudio.
+- [ ] Create package for linux distros (I don't here experience here so help is highly appreciated).
 - [ ] Try to train the net with data for specific cases and see if will do better for them.
 
 ## License

src/common/CMakeLists.txt

@@ -3,6 +3,8 @@ project(RnNoisePluginCommon LANGUAGES CXX)
 
 set(CMAKE_CXX_STANDARD 14)
 
+set(CMAKE_POSITION_INDEPENDENT_CODE ON)
+
 set(COMMON_SRC
         include/common/RnNoiseCommonPlugin.h
         src/RnNoiseCommonPlugin.cpp)

src/ladspa_plugin/CMakeLists.txt

@@ -0,0 +1,42 @@
+cmake_minimum_required(VERSION 3.6)
+project(rnnoise_ladspa_plugin LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 14)
+
+set(CMAKE_POSITION_INDEPENDENT_CODE ON)
+
+include_directories(${CMAKE_CURRENT_SOURCE_DIR})
+
+set(PROJECT_ROOT ../../../)
+
+set(LADSPA_INTERFACE_SRC
+        ladspa.h
+        ladspa++.h)
+
+set(LADSPA_IMPL_SRC
+        RnNoiseLadspaPlugin.h
+        RnNoiseLadspaPlugin.cpp)
+
+set(LADSPA_PLUGIN_SOURCES
+        ${LADSPA_INTERFACE_SRC}
+        ${LADSPA_IMPL_SRC})
+
+function(build bit)
+    set(LADSPA_TARGET_X${bit} rnnoise_ladspa_x${bit})
+
+    add_library(${LADSPA_TARGET_X${bit}} SHARED ${LADSPA_PLUGIN_SOURCES})
+
+    target_link_libraries(${LADSPA_TARGET_X${bit}} RnNoisePluginCommon "-static-libgcc -static-libstdc++ -m${bit}")
+
+    set(X${bit}_COMPILE_OPTIONS
+            "-m${bit};"
+            "$<$<CONFIG:RELEASE>:-O3;>")
+
+    target_compile_options(${LADSPA_TARGET_X${bit}} PRIVATE ${X${bit}_COMPILE_OPTIONS})
+
+    set_target_properties(${LADSPA_TARGET_X${bit}} PROPERTIES
+            LIBRARY_OUTPUT_DIRECTORY "${PROJECT_ROOT}/bin/x${bit}/ladspa")
+endfunction()
+
+build(32)
+build(64)

src/ladspa_plugin/RnNoiseLadspaPlugin.cpp

@@ -0,0 +1,2 @@
+#include "RnNoiseLadspaPlugin.h"
+

src/ladspa_plugin/RnNoiseLadspaPlugin.h

@@ -0,0 +1,65 @@
+#pragma once
+
+#include "ladspa++.h"
+#include "common/RnNoiseCommonPlugin.h"
+
+using namespace ladspa;
+
+struct RnNoise {
+    enum class port_names {
+        in_1,
+        out_1,
+        size
+    };
+
+    static constexpr port_info_t port_info[] =
+            {
+                    port_info_common::audio_input,
+                    port_info_common::audio_output,
+                    port_info_common::final_port
+            };
+
+    static constexpr info_t info =
+            {
+                    9354877, // unique id
+                    "noise_suppressor",
+                    properties::realtime,
+                    "Noise Suppressor for Voice",
+                    "werman",
+                    "Removes wide range of noises from voice in real time, based on Xiph's RNNoise library.",
+                    {"voice", "noise suppression", "de-noise"},
+                    strings::copyright::gpl3,
+                    nullptr // implementation data
+            };
+
+    RnNoise() {
+        m_rnNoisePlugin.init();
+    }
+
+    ~RnNoise() {
+        m_rnNoisePlugin.deinit();
+    }
+
+    void run(port_array_t<port_names, port_info> &ports) {
+
+		const_buffer in_buffer = ports.get<port_names::in_1>();
+		buffer out_buffer = ports.get<port_names::out_1>();
+
+        m_rnNoisePlugin.process(in_buffer.data(), out_buffer.data(), in_buffer.size());
+    }
+
+    RnNoiseCommonPlugin m_rnNoisePlugin;
+};
+
+/*
+ * to be called by ladspa
+ */
+
+void _init() {}
+
+void _fini() {}
+
+const LADSPA_Descriptor *
+ladspa_descriptor(plugin_index_t index) {
+    return collection<RnNoise>::get_ladspa_descriptor(index);
+}