[client] audio: add transport provider interface

Route audio through a provider interface. Connected transports take
priority while SPICE remains the fallback.

Carry explicit sample formats, rates, channel layouts, and source clocks
through playback and recording. Add optional presentation clock feedback
for active synchronization.

client/src/audio.h

@@ -18,32 +18,37 @@
  * Temple Place, Suite 330, Boston, MA 02111-1307 USA
  */
 
+#ifndef _H_LG_CLIENT_AUDIO_
+#define _H_LG_CLIENT_AUDIO_
+
+#include "interface/audio.h"
+
 #if ENABLE_AUDIO
 
-#include <stdbool.h>
-#include <purespice.h>
+void lgAudio_init(void);
+void lgAudio_free(void);
 
-void audio_init(void);
-void audio_free(void);
+void lgAudio_setFallback(const LG_AudioOps * ops, void * opaque);
+void lgAudio_setTransport(const LG_AudioOps * ops, void * opaque);
+void lgAudio_dropTransport(void);
 
-bool audio_supportsPlayback(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, uint32_t time);
-
-bool audio_supportsRecord(void);
-void audio_recordStart(int channels, int sampleRate, PSAudioFormat format);
-void audio_recordToggleKeybind(int sc, void * opaque);
-void audio_recordStop(void);
-void audio_recordVolume(int channels, const uint16_t volume[]);
-void audio_recordMute(bool mute);
+bool lgAudio_supportsPlayback(void);
+bool lgAudio_supportsRecord(void);
+void lgAudio_recordToggleKeybind(int sc, void * opaque);
 
 #else
 
-static inline void audio_init(void) {}
-static inline void audio_free(void) {}
+static inline void lgAudio_init(void) {}
+static inline void lgAudio_free(void) {}
+static inline void lgAudio_setFallback(
+    const LG_AudioOps * ops, void * opaque) {}
+static inline void lgAudio_setTransport(
+    const LG_AudioOps * ops, void * opaque) {}
+static inline void lgAudio_dropTransport(void) {}
+static inline bool lgAudio_supportsPlayback(void) { return false; }
+static inline bool lgAudio_supportsRecord(void) { return false; }
+static inline void lgAudio_recordToggleKeybind(int sc, void * opaque) {}
+
+#endif
 
 #endif