[client] audio: move audio code into it's own unit

client/src/audio.h

@@ -0,0 +1,29 @@
+/**
+ * Looking Glass
+ * Copyright © 2017-2022 The Looking Glass Authors
+ * https://looking-glass.io
+ *
+ * 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 2 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, write to the Free Software Foundation, Inc., 59
+ * Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+void audio_init(void);
+void audio_free(void);
+
+void audio_playbackStart(int channels, int sampleRate, PSAudioFormat format,
+  uint32_t time);
+void audio_playbackStop(void);
+void audio_playbackVolume(int channels, const uint16_t volume[]);
+void audio_playbackMute(bool mute);
+void audio_playbackData(uint8_t * data, size_t size);