Add support for ALSA compressed offload

See
https://docs.kernel.org/sound/designs/compress-offload.html
https://github.com/alsa-project/tinycompress

spa/include/spa/param/audio/compressed.h

@@ -0,0 +1,39 @@
+/* Simple Plugin API
+ *
+ * Copyright © 2021 Wim Taymans
+ *           © 2022 Asymptotic Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef SPA_AUDIO_COMPRESSED_H
+#define SPA_AUDIO_COMPRESSED_H
+
+#include <spa/param/audio/aac.h>
+#include <spa/param/audio/alac.h>
+#include <spa/param/audio/amr.h>
+#include <spa/param/audio/ape.h>
+#include <spa/param/audio/flac.h>
+#include <spa/param/audio/mp3.h>
+#include <spa/param/audio/ra.h>
+#include <spa/param/audio/vorbis.h>
+#include <spa/param/audio/wma.h>
+
+#endif /* SPA_AUDIO_COMPRESSED_H */