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diff --git a/include/sound.hpp b/include/sound.hpp
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+++ b/include/sound.hpp
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+/*
+    Copyright (C) 2020 dec05eba
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#ifndef GPU_SCREEN_RECORDER_H
+#define GPU_SCREEN_RECORDER_H
+
+#include <vector>
+#include <string>
+
+typedef struct {
+    void *handle;
+    unsigned int frames;
+} SoundDevice;
+
+struct AudioDevice {
+    std::string name;
+    std::string description;
+};
+
+struct AudioDevices {
+    std::string default_output;
+    std::string default_input;
+    std::vector<AudioDevice> audio_inputs;
+};
+
+enum class AudioInputType {
+    DEVICE,
+    APPLICATION
+};
+
+struct AudioInput {
+    std::string name;
+    AudioInputType type = AudioInputType::DEVICE;
+    bool inverted = false;
+};
+
+struct MergedAudioInputs {
+    std::string track_name;
+    std::vector<AudioInput> audio_inputs;
+};
+
+typedef enum {
+    S16,
+    S32,
+    F32
+} AudioFormat;
+
+/*
+    Get a sound device by name, returning the device into the |device| parameter.
+    |device_name| can be a device name or "default_output", "default_input" or "" to not connect to any device (used for app audio for example).
+    If the device name is "default_output" or "default_input" then it will automatically switch which
+    device is records from when the default output/input is changed in the system audio settings.
+    Returns 0 on success, or a negative value on failure.
+*/
+int sound_device_get_by_name(SoundDevice *device, const char *node_name, const char *device_name, const char *description, unsigned int num_channels, unsigned int period_frame_size, AudioFormat audio_format);
+
+void sound_device_close(SoundDevice *device);
+
+/*
+    Returns the next chunk of audio into @buffer.
+    Returns the number of frames read, or a negative value on failure.
+*/
+int sound_device_read_next_chunk(SoundDevice *device, void **buffer, double timeout_sec, double *latency_seconds);
+
+AudioDevices get_pulseaudio_inputs();
+bool pulseaudio_server_is_pipewire();
+
+#endif /* GPU_SCREEN_RECORDER_H */