move audio-dsp to audio-session

Make a new module audio-session that manages clients and what audio
sessions they use.
Move the audio-dsp to the audio-session

src/modules/module-audio-session/audio-dsp.h

@@ -0,0 +1,44 @@
+/* PipeWire
+ * Copyright (C) 2018 Wim Taymans <wim.taymans@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __PIPEWIRE_AUDIO_DSP_H__
+#define __PIPEWIRE_AUDIO_DSP_H__
+
+#include <pipewire/core.h>
+#include <pipewire/node.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct pw_node *
+pw_audio_dsp_new(struct pw_core *core,
+		 const struct pw_properties *properties,
+		 enum pw_direction direction,
+		 uint32_t channels,
+		 uint32_t max_buffer_size,
+		 size_t user_data_size);
+
+void *pw_audio_dsp_get_user_data(struct pw_node *node);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __PIPEWIRE_AUDIO_DSP_H__ */