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include/pipewire_audio.h

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+#ifndef GSR_PIPEWIRE_AUDIO_H
+#define GSR_PIPEWIRE_AUDIO_H
+
+#include <pipewire/thread-loop.h>
+#include <pipewire/context.h>
+#include <pipewire/core.h>
+#include <spa/utils/hook.h>
+
+#include <stdbool.h>
+
+typedef enum {
+    GSR_PIPEWIRE_AUDIO_NODE_TYPE_STREAM_OUTPUT, /* Application audio */
+    GSR_PIPEWIRE_AUDIO_NODE_TYPE_STREAM_INPUT,  /* Audio recording input */
+    GSR_PIPEWIRE_AUDIO_NODE_TYPE_SINK_OR_SOURCE /* Audio output or input device or combined (virtual) sink */
+} gsr_pipewire_audio_node_type;
+
+typedef struct {
+    uint32_t id;
+    char *name;
+    gsr_pipewire_audio_node_type type;
+} gsr_pipewire_audio_node;
+
+typedef enum {
+    GSR_PIPEWIRE_AUDIO_PORT_DIRECTION_INPUT,
+    GSR_PIPEWIRE_AUDIO_PORT_DIRECTION_OUTPUT
+} gsr_pipewire_audio_port_direction;
+
+typedef struct {
+    uint32_t id;
+    uint32_t node_id;
+    gsr_pipewire_audio_port_direction direction;
+    char *name;
+} gsr_pipewire_audio_port;
+
+typedef struct {
+    uint32_t id;
+    uint32_t output_node_id;
+    uint32_t input_node_id;
+} gsr_pipewire_audio_link;
+
+typedef enum {
+    GSR_PIPEWIRE_AUDIO_LINK_INPUT_TYPE_STREAM, /* Application */
+    GSR_PIPEWIRE_AUDIO_LINK_INPUT_TYPE_SINK    /* Combined (virtual) sink */
+} gsr_pipewire_audio_link_input_type;
+
+typedef enum {
+    GSR_PIPEWIRE_AUDIO_REQUESTED_TYPE_STANDARD,
+    GSR_PIPEWIRE_AUDIO_REQUESTED_TYPE_DEFAULT_OUTPUT,
+    GSR_PIPEWIRE_AUDIO_REQUESTED_TYPE_DEFAULT_INPUT
+} gsr_pipewire_audio_requested_type;
+
+typedef struct {
+    char *name;
+    gsr_pipewire_audio_requested_type type;
+} gsr_pipewire_audio_requested_output;
+
+typedef struct {
+    gsr_pipewire_audio_requested_output *outputs;
+    int num_outputs;
+    char *input_name;
+    bool inverted;
+    gsr_pipewire_audio_node_type output_type;
+    gsr_pipewire_audio_link_input_type input_type;
+} gsr_pipewire_audio_requested_link;
+
+typedef struct {
+    struct pw_thread_loop *thread_loop;
+    struct pw_context *context;
+    struct pw_core *core;
+    struct spa_hook core_listener;
+    struct pw_registry *registry;
+    struct spa_hook registry_listener;
+    int server_version_sync;
+
+    struct pw_proxy *metadata_proxy;
+    struct spa_hook metadata_listener;
+    struct spa_hook metadata_proxy_listener;
+    char default_output_device_name[128];
+    char default_input_device_name[128];
+
+    gsr_pipewire_audio_node *stream_nodes;
+    size_t num_stream_nodes;
+    size_t stream_nodes_capacity_items;
+
+    gsr_pipewire_audio_port *ports;
+    size_t num_ports;
+    size_t ports_capacity_items;
+
+    gsr_pipewire_audio_link *links;
+    size_t num_links;
+    size_t links_capacity_items;
+
+    gsr_pipewire_audio_requested_link *requested_links;
+    size_t num_requested_links;
+    size_t requested_links_capacity_items;
+
+    bool running;
+} gsr_pipewire_audio;
+
+bool gsr_pipewire_audio_init(gsr_pipewire_audio *self);
+void gsr_pipewire_audio_deinit(gsr_pipewire_audio *self);
+
+/*
+    This function links audio source outputs from applications that match the name |app_names| to the input
+    that matches the name |stream_name_input|.
+    If an application or a new application starts outputting audio after this function is called and the app name matches
+    then it will automatically link the audio sources.
+    |app_names| and |stream_name_input| are case-insensitive matches.
+*/
+bool gsr_pipewire_audio_add_link_from_apps_to_stream(gsr_pipewire_audio *self, const char **app_names, int num_app_names, const char *stream_name_input);
+/*
+    This function links audio source outputs from all applications except the ones that match the name |app_names| to the input
+    that matches the name |stream_name_input|.
+    If an application or a new application starts outputting audio after this function is called and the app name doesn't match
+    then it will automatically link the audio sources.
+    |app_names| and |stream_name_input| are case-insensitive matches.
+*/
+bool gsr_pipewire_audio_add_link_from_apps_to_stream_inverted(gsr_pipewire_audio *self, const char **app_names, int num_app_names, const char *stream_name_input);
+
+/*
+    This function links audio source outputs from applications that match the name |app_names| to the input
+    that matches the name |sink_name_input|.
+    If an application or a new application starts outputting audio after this function is called and the app name matches
+    then it will automatically link the audio sources.
+    |app_names| and |sink_name_input| are case-insensitive matches.
+*/
+bool gsr_pipewire_audio_add_link_from_apps_to_sink(gsr_pipewire_audio *self, const char **app_names, int num_app_names, const char *sink_name_input);
+/*
+    This function links audio source outputs from all applications except the ones that match the name |app_names| to the input
+    that matches the name |sink_name_input|.
+    If an application or a new application starts outputting audio after this function is called and the app name doesn't match
+    then it will automatically link the audio sources.
+    |app_names| and |sink_name_input| are case-insensitive matches.
+*/
+bool gsr_pipewire_audio_add_link_from_apps_to_sink_inverted(gsr_pipewire_audio *self, const char **app_names, int num_app_names, const char *sink_name_input);
+
+/*
+    This function links audio source outputs from devices that match the name |source_names| to the input
+    that matches the name |stream_name_input|.
+    If a device or a new device starts outputting audio after this function is called and the device name matches
+    then it will automatically link the audio sources.
+    |source_names| and |stream_name_input| are case-insensitive matches.
+    |source_names| can include "default_output" or "default_input" to use the default output/input
+    and it will automatically switch when the default output/input is changed in system audio settings.
+*/
+bool gsr_pipewire_audio_add_link_from_sources_to_stream(gsr_pipewire_audio *self, const char **source_names, int num_source_names, const char *stream_name_input);
+
+/*
+    This function links audio source outputs from devices that match the name |source_names| to the input
+    that matches the name |sink_name_input|.
+    If a device or a new device starts outputting audio after this function is called and the device name matches
+    then it will automatically link the audio sources.
+    |source_names| and |sink_name_input| are case-insensitive matches.
+    |source_names| can include "default_output" or "default_input" to use the default output/input
+    and it will automatically switch when the default output/input is changed in system audio settings.
+*/
+bool gsr_pipewire_audio_add_link_from_sources_to_sink(gsr_pipewire_audio *self, const char **source_names, int num_source_names, const char *sink_name_input);
+
+/* Return true to continue */
+typedef bool (*gsr_pipewire_audio_app_query_callback)(const char *app_name, void *userdata);
+void gsr_pipewire_audio_for_each_app(gsr_pipewire_audio *self, gsr_pipewire_audio_app_query_callback callback, void *userdata);
+
+#endif /* GSR_PIPEWIRE_AUDIO_H */