feat(audio): custom surround-params (#2424)

src/audio.h

@@ -26,12 +26,20 @@ namespace audio {
     int bitrate;
   };
 
+  struct stream_params_t {
+    int channelCount;
+    int streams;
+    int coupledStreams;
+    std::uint8_t mapping[8];
+  };
+
   extern opus_stream_config_t stream_configs[MAX_STREAM_CONFIG];
 
   struct config_t {
     enum flags_e : int {
       HIGH_QUALITY,
       HOST_AUDIO,
+      CUSTOM_SURROUND_PARAMS,
       MAX_FLAGS
     };
 
@@ -39,6 +47,8 @@ namespace audio {
     int channels;
     int mask;
 
+    stream_params_t customStreamParams;
+
     std::bitset<MAX_FLAGS> flags;
   };