Create virtual audio sinks on Linux

sunshine/audio.h

@@ -4,10 +4,31 @@
 #include "thread_safe.h"
 #include "utility.h"
 namespace audio {
+enum stream_config_e : int {
+  STEREO,
+  SURROUND51,
+  HIGH_SURROUND51,
+  SURROUND71,
+  HIGH_SURROUND71,
+  MAX_STREAM_CONFIG
+};
+
+struct opus_stream_config_t {
+  std::int32_t sampleRate;
+  int channelCount;
+  int streams;
+  int coupledStreams;
+  const std::uint8_t *mapping;
+};
+
+extern opus_stream_config_t stream_configs[MAX_STREAM_CONFIG];
+
 struct config_t {
   int packetDuration;
   int channels;
   int mask;
+
+  bool high_quality;
 };
 
 using packet_t       = util::buffer_t<std::uint8_t>;