Provide option to select the source for audio on Linux

sunshine/config.cpp

@@ -26,6 +26,8 @@ video_t video {
   "zerolatency"s // tune
 };
 
+audio_t audio {};
+
 stream_t stream {
   2s, // ping_timeout
 
@@ -172,6 +174,8 @@ void parse_file(const char *file) {
   string_f(vars, "file_devices", nvhttp.file_devices);
   string_f(vars, "external_ip", nvhttp.external_ip);
 
+  string_f(vars, "audio_sink", audio.sink);
+
   string_restricted_f(vars, "origin_pin_allowed", nvhttp.origin_pin_allowed, {
     "pc"sv, "lan"sv, "wan"sv
   });

sunshine/config.h

@@ -19,6 +19,10 @@ struct video_t {
   std::string tune;
 };
 
+struct audio_t {
+  std::string sink;
+};
+
 struct stream_t {
   std::chrono::milliseconds ping_timeout;
 
@@ -52,6 +56,7 @@ struct sunshine_t {
 };
 
 extern video_t video;
+extern audio_t audio;
 extern stream_t stream;
 extern nvhttp_t nvhttp;
 extern input_t input;

sunshine/platform/linux.cpp

@@ -23,6 +23,7 @@
 
 #include <bitset>
 #include <sunshine/task_pool.h>
+#include <sunshine/config.h>
 
 namespace platf {
 using namespace std::literals;
@@ -330,15 +331,22 @@ std::unique_ptr<mic_t> microphone(std::uint32_t sample_rate) {
   };
 
   int status;
+
+  const char *audio_sink = nullptr;
+  if(!config::audio.sink.empty()) {
+    audio_sink = config::audio.sink.c_str();
+  }
+
   mic->mic.reset(
-    pa_simple_new(nullptr, "sunshine", pa_stream_direction_t::PA_STREAM_RECORD, nullptr, "sunshine_record", &mic->ss, nullptr, nullptr, &status)
+    pa_simple_new(nullptr, "sunshine", pa_stream_direction_t::PA_STREAM_RECORD, audio_sink, "sunshine_record", &mic->ss, nullptr, nullptr, &status)
   );
 
   if(!mic->mic) {
     auto err_str = pa_strerror(status);
     BOOST_LOG(error) << "pa_simple_new() failed: "sv << err_str;
 
-    exit(1);
+    log_flush();
+    std::abort();
   }
 
   return mic;