From 9e791d26560b566bb21b5cd39d9042a41f29714c Mon Sep 17 00:00:00 2001
From: Jonathan Bradley <jcb@pikum.xyz>
Date: Wed, 25 Jun 2025 17:50:44 -0400
Subject: audio: first-pass, pipewire

---
 src/audio-impl-pw.hpp | 71 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 src/audio-impl-pw.hpp

(limited to 'src/audio-impl-pw.hpp')

diff --git a/src/audio-impl-pw.hpp b/src/audio-impl-pw.hpp
new file mode 100644
index 0000000..c371973
--- /dev/null
+++ b/src/audio-impl-pw.hpp
@@ -0,0 +1,71 @@
+#ifndef PKE_AUDIO_IMPL_PW_HPP
+#define PKE_AUDIO_IMPL_PW_HPP
+
+#include <atomic>
+
+#include "pk.h"
+
+// 2025-06-24 spa does not have c++ headers so we have to use c headers.
+//  They throw a ton of pedantic warnings that spam the build output.
+// Might be too large of a swath, but none of this is my code anyway.
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic"
+#include <pipewire/pipewire.h>
+#include <pipewire/extensions/metadata.h>
+#include <spa/param/audio/format-utils.h>
+#include <spa/param/audio/raw.h>
+#include <spa/param/param.h>
+#include <spa/utils/string.h>
+#pragma GCC diagnostic pop
+
+#define PKE_AUDIO_IMPL_POD_BUFFER_LEN 1024
+enum pke_audio_pw_object_type : uint8_t {
+	PKE_AUDIO_PW_OBJECT_TYPE_ANY,
+	PKE_AUDIO_PW_OBJECT_TYPE_NODE,
+	PKE_AUDIO_PW_OBJECT_TYPE_PORT,
+	PKE_AUDIO_PW_OBJECT_TYPE_LINK,
+	PKE_AUDIO_PW_OBJECT_TYPE_METADATA,
+};
+struct pke_audio_pw_object {
+	union {
+		struct {
+			enum pw_direction direction;
+			uint32_t node;
+			uint32_t id;
+		} port;
+		struct {
+			uint32_t output_port;
+			uint32_t input_port;
+			uint32_t dummy;
+		} link;
+	} data;
+	uint32_t id;
+	enum pke_audio_pw_object_type type;
+	struct pw_properties *props;
+};
+struct pke_audio_implementation_pipewire {
+	pk_membucket *bkt;
+	pw_thread_loop *loop;
+	uint8_t *pod_buffer;
+	pw_stream *stream;
+	pw_core *core;
+	pw_registry *registry;
+	spa_hook registry_listener;
+	pw_metadata *metadata;
+	spa_hook metadata_listener;
+	pk_arr_t<pke_audio_pw_object> pw_objects;
+	pk_arr_t<void*> created_objects;
+	char *default_sink_name;
+	spa_audio_info format;
+	uint32_t default_sink_id;
+	std::atomic_bool is_needing_output_remapped;
+};
+extern struct pke_audio_implementation_pipewire pke_audio_impl_pw;
+void pke_audio_pw_init();
+void pke_audio_pw_teardown();
+void on_pipewire_process(void *user_data);
+void on_pipewire_stream_param_changed(void *, uint32_t id, const struct spa_pod *param);
+void on_registry_event_global(void *data, uint32_t id, uint32_t permissions, const char *type, uint32_t version, const struct spa_dict *props);
+void on_registry_event_global_removal(void *data, uint32_t id);
+
+#endif /* PKE_AUDIO_IMPL_PW_HPP */
-- 
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