feat: Add Max Bitrate option (#3628)

docs/configuration.md

@@ -1316,6 +1316,29 @@ editing the `conf` file in a text editor. Use the examples as reference.
     </tr>
 </table>
 
+### max_bitrate
+
+<table>
+    <tr>
+        <td>Description</td>
+        <td colspan="2">
+            The maximum bitrate (in Kbps) that Sunshine will encode the stream at. If set to 0, it will always use the bitrate requested by Moonlight.
+        </td>
+    </tr>
+    <tr>
+        <td>Default</td>
+        <td colspan="2">@code{}
+            0
+            @endcode</td>
+    </tr>
+    <tr>
+        <td>Example</td>
+        <td colspan="2">@code{}
+            max_bitrate = 5000
+            @endcode</td>
+    </tr>
+</table>
+
 ### min_fps_factor
 
 <table>

src/config.cpp

@@ -509,7 +509,8 @@ namespace config {
       {}  // wa
     },  // display_device
 
-    1  // min_fps_factor
+    1,  // min_fps_factor
+    0  // max_bitrate
   };
 
   audio_t audio {
@@ -1138,6 +1139,7 @@ namespace config {
     bool_f(vars, "dd_wa_hdr_toggle", video.dd.wa.hdr_toggle);
 
     int_between_f(vars, "min_fps_factor", video.min_fps_factor, {1, 3});
+    int_f(vars, "max_bitrate", video.max_bitrate);
 
     path_f(vars, "pkey", nvhttp.pkey);
     path_f(vars, "cert", nvhttp.cert);

src/config.h

@@ -138,6 +138,7 @@ namespace config {
     } dd;
 
     int min_fps_factor;  // Minimum fps target, determines minimum frame time
+    int max_bitrate;  // Maximum bitrate, sets ceiling in kbps for bitrate requested from client
   };
 
   struct audio_t {

src/video.cpp

@@ -1687,7 +1687,8 @@ namespace video {
         }
       }
 
-      auto bitrate = config.bitrate * 1000;
+      auto bitrate = ((config::video.max_bitrate > 0) ? std::min(config.bitrate, config::video.max_bitrate) : config.bitrate) * 1000;
+      BOOST_LOG(info) << "Max bitrate is " << config::video.max_bitrate;
       ctx->rc_max_rate = bitrate;
       ctx->bit_rate = bitrate;
 

src_assets/common/assets/web/config.html

@@ -179,6 +179,7 @@
               "dd_mode_remapping": {"mixed": [], "resolution_only": [], "refresh_rate_only": []},
               "dd_wa_hdr_toggle": "disabled",
               "min_fps_factor": 1,
+              "max_bitrate": 0,
             },
           },
           {

src_assets/common/assets/web/configs/tabs/audiovideo/DisplayModesSettings.vue

@@ -17,6 +17,13 @@ const config = ref(props.config)
     <input type="number" min="1" max="3" class="form-control" id="min_fps_factor" placeholder="1" v-model="config.min_fps_factor" />
     <div class="form-text">{{ $t('config.min_fps_factor_desc') }}</div>
   </div>
+
+  <!--max_bitrate-->
+  <div class="mb-3">
+    <label for="max_bitrate" class="form-label">{{ $t("config.max_bitrate") }}</label>
+    <input type="number" class="form-control" id="max_bitrate" placeholder="0" v-model="config.max_bitrate" />
+    <div class="form-text">{{ $t("config.max_bitrate_desc") }}</div>
+  </div>
 </template>
 
 <style scoped>