Disable application audio recording on pulseaudio

include/sound.hpp

@@ -74,5 +74,6 @@ void sound_device_close(SoundDevice *device);
 int sound_device_read_next_chunk(SoundDevice *device, void **buffer, double timeout_sec, double *latency_seconds);
 
 AudioDevices get_pulseaudio_inputs();
+bool pulseaudio_server_is_pipewire();
 
 #endif /* GPU_SCREEN_RECORDER_H */

src/main.cpp

@@ -1901,11 +1901,7 @@ static void list_system_info(bool wayland) {
     printf("display_server|%s\n", wayland ? "wayland" : "x11");
     bool supports_app_audio = false;
 #ifdef GSR_APP_AUDIO
-    gsr_pipewire_audio audio;
-    if(gsr_pipewire_audio_init(&audio)) {
-        supports_app_audio = true;
-        gsr_pipewire_audio_deinit(&audio);
-    }
+    supports_app_audio = pulseaudio_server_is_pipewire();
 #endif
     printf("supports_app_audio|%s\n", supports_app_audio ? "yes" : "no");
 }
@@ -3201,7 +3197,12 @@ int main(int argc, char **argv) {
     memset(&pipewire_audio, 0, sizeof(pipewire_audio));
     if(uses_app_audio) {
         if(!gsr_pipewire_audio_init(&pipewire_audio)) {
-            fprintf(stderr, "gsr error: failed to setup PipeWire audio for application audio capture. The likely reason for this failure is that your sound server is not PipeWire\n");
+            fprintf(stderr, "gsr error: failed to setup PipeWire audio for application audio capture. The likely reason for this failure is that your sound server is not PipeWire. The options -aa and -aai are only available when running PipeWire audio server.\n");
+            _exit(2);
+        }
+
+        if(!pulseaudio_server_is_pipewire()) {
+            fprintf(stderr, "gsr error: your sound server is not PipeWire. The options -aa and -aai are only available when running PipeWire audio server.\n");
             _exit(2);
         }
 

src/sound.cpp

@@ -399,6 +399,12 @@ static void pa_server_info_cb(pa_context*, const pa_server_info *server_info, vo
         audio_devices->default_input = server_info->default_source_name;
 }
 
+static void server_info_callback(pa_context*, const pa_server_info *server_info, void *userdata) {
+    bool *is_server_pipewire = (bool*)userdata;
+    if(server_info->server_name && strstr(server_info->server_name, "PipeWire"))
+        *is_server_pipewire = true;
+}
+
 static void get_pulseaudio_default_inputs(AudioDevices &audio_devices) {
     int state = 0;
     int pa_ready = 0;
@@ -493,3 +499,50 @@ AudioDevices get_pulseaudio_inputs() {
     pa_mainloop_free(main_loop);
     return audio_devices;
 }
+
+bool pulseaudio_server_is_pipewire() {
+    int state = 0;
+    int pa_ready = 0;
+    pa_operation *pa_op = NULL;
+    bool is_server_pipewire = false;
+
+    pa_mainloop *main_loop = pa_mainloop_new();
+    if(!main_loop)
+        return is_server_pipewire;
+
+    pa_context *ctx = pa_context_new(pa_mainloop_get_api(main_loop), "gpu-screen-recorder");
+    if(pa_context_connect(ctx, NULL, PA_CONTEXT_NOFLAGS, NULL) < 0)
+        goto done;
+
+    pa_context_set_state_callback(ctx, pa_state_cb, &pa_ready);
+
+    for(;;) {
+        // Not ready
+        if(pa_ready == 0) {
+            pa_mainloop_iterate(main_loop, 1, NULL);
+            continue;
+        }
+
+        switch(state) {
+            case 0: {
+                pa_op = pa_context_get_server_info(ctx, server_info_callback, &is_server_pipewire);
+                ++state;
+                break;
+            }
+        }
+
+        // Couldn't get connection to the server
+        if(pa_ready == 2 || (state == 1 && pa_op && pa_operation_get_state(pa_op) == PA_OPERATION_DONE))
+            break;
+
+        pa_mainloop_iterate(main_loop, 1, NULL);
+    }
+
+    done:
+    if(pa_op)
+        pa_operation_unref(pa_op);
+    pa_context_disconnect(ctx);
+    pa_context_unref(ctx);
+    pa_mainloop_free(main_loop);
+    return is_server_pipewire;
+}