Provide option to select the source for audio on Linux

README.txt

@@ -75,6 +75,10 @@ Trouleshooting:
 	* If you get "Could not create Sunshine Gamepad: Permission Denied" Try the following steps before running sunshine:
 		* sudo chown root:input /dev/uinput
 		* sudo chmod 660 /dev/uinput
+	* If Sunshine sends audio from the microphone instead of the speaker, try the following steps:
+		* pacmd list-sources | grep "name:"
+		* Copy the name to the configuration option "audio_sink"
+		* restart sunshine
 
 When an application is started, if there is an application already running, it will be terminated.
 When the application has been shutdown, the stream shuts down as well.

assets/sunshine.conf

@@ -57,6 +57,13 @@ fec_percentage = 10
 # If back_button_timeout < 0, then the Home/Guide button will not be emulated
 # back_button_timeout = 2000
 
+# The name of the audio sink used for Audio Loopback
+# If you do not specify this variable, pulseaudio will select a default device, which could be a microphone instead of a speaker
+#
+# You can find the name of the audio sink using the following command:
+# pacmd list-sources | grep "name:"
+# audio_sink = alsa_output.pci-0000_09_00.3.analog-stereo.monitor
+
 
 ###############################################
 # FFmpeg software encoding parameters

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;