Expose the adaptive call video range in Android audio settings

tools/chatgui-android/app/src/main/java/com/utun/chat/ui/screens/SettingsScreen.kt

@@ -1,6 +1,7 @@
 package com.utun.chat.ui.screens
 
 import com.utun.chat.R
+import kotlin.math.roundToInt
 import androidx.compose.ui.res.stringResource
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.Canvas
@@ -35,6 +36,7 @@ import com.utun.chat.data.RadioOverlayService
 import com.utun.chat.data.RadioAudioEngine
 import com.utun.chat.data.RadioAutoSettings
 import com.utun.chat.data.ConfigProvider
+import com.utun.chat.data.CallVideoBitrateRange
 import com.utun.chat.data.MicrophonePermission
 import com.utun.chat.data.LogManager
 import com.utun.chat.data.ServerEntry
@@ -903,6 +905,11 @@ private fun AudioSettingsTab(vm: ChatViewModel) {
     var presetExpanded by remember { mutableStateOf(false) }
 
     var jitterReserveMs by remember { mutableStateOf(provider.getInt("chat.call_jitter_max_reserve_ms")) }
+    val savedVideoRange = remember { provider.getCallVideoBitrateRange() }
+    var videoMinimum by rememberSaveable { mutableIntStateOf(savedVideoRange.minimum) }
+    var videoMaximum by rememberSaveable { mutableIntStateOf(savedVideoRange.maximum) }
+    var videoRangeSaving by remember { mutableStateOf(false) }
+    var videoRangeSaveFailed by remember { mutableStateOf(false) }
 
     /* Все параметры восстанавливаются из одного снимка DataStore. */
     var compressorOn by remember { mutableStateOf(savedVoiceSettings.compressorEnabled) }
@@ -1035,6 +1042,34 @@ private fun AudioSettingsTab(vm: ChatViewModel) {
             }
         )
 
+        Text(stringResource(R.string.call_video_bitrate_range), style = MaterialTheme.typography.titleMedium)
+        Text(stringResource(R.string.call_video_bitrate_range_value, videoMinimum, videoMaximum))
+        Text(stringResource(R.string.call_video_bitrate_range_hint), style = MaterialTheme.typography.bodySmall)
+        RangeSlider(
+            value = videoMinimum.toFloat()..videoMaximum.toFloat(),
+            onValueChange = { videoMinimum = it.start.roundToInt(); videoMaximum = it.endInclusive.roundToInt() },
+            valueRange = 300f..4000f,
+            steps = 36,
+            enabled = !videoRangeSaving,
+            onValueChangeFinished = {
+                val range = CallVideoBitrateRange(videoMinimum, videoMaximum)
+                videoRangeSaving = true
+                videoRangeSaveFailed = false
+                vm.viewModelScope.launch {
+                    try {
+                        provider.saveCallVideoBitrateRange(range)
+                        NativeLib.setChatSetting("call_video_bitrate_range_kbps", range.encode())
+                    } catch (e: IOException) {
+                        videoRangeSaveFailed = true
+                        LogManager.addLog("ERROR", "CallSettings", "Video bitrate range save failed: $range: $e")
+                    } finally {
+                        videoRangeSaving = false
+                    }
+                }
+            }
+        )
+        if (videoRangeSaveFailed) Text(stringResource(R.string.call_video_bitrate_range_save_failed), color = MaterialTheme.colorScheme.error)
+
         /* ── Voice Compressor ── */
         Text(stringResource(R.string.voice_compressor), style = MaterialTheme.typography.titleMedium)
         Row(verticalAlignment = Alignment.CenterVertically) {

tools/chatgui-android/app/src/main/res/values-ru/strings.xml

@@ -282,6 +282,10 @@
     <string name="test">"Проверить"</string>
     <string name="voice_codec_quality">"Качество голосового кодека"</string>
     <string name="call_max_jitter_reserve">"Звонки: максимальный запас джиттер-буфера"</string>
+    <string name="call_video_bitrate_range">Звонки: диапазон битрейта видео</string>
+    <string name="call_video_bitrate_range_value">%1$d–%2$d кбит/с</string>
+    <string name="call_video_bitrate_range_hint">Битрейт видео подстраивается под связь в заданном диапазоне. По умолчанию: 300–4000 кбит/с.</string>
+    <string name="call_video_bitrate_range_save_failed">Не удалось сохранить диапазон битрейта видеозвонка. Попробуйте ещё раз.</string>
     <string name="call_jitter_hint">"%1$s с · применяется к следующему звонку"</string>
     <string name="voice_compressor">"Голосовой компрессор"</string>
     <string name="lookback_time">"Время анализа:"</string>

tools/chatgui-android/app/src/main/res/values/strings.xml

@@ -283,6 +283,10 @@
     <string name="test">"Test"</string>
     <string name="voice_codec_quality">"Voice codec quality"</string>
     <string name="call_max_jitter_reserve">"Calls: maximum jitter buffer reserve"</string>
+    <string name="call_video_bitrate_range">Calls: video bitrate range</string>
+    <string name="call_video_bitrate_range_value">%1$d–%2$d kbit/s</string>
+    <string name="call_video_bitrate_range_hint">Video bitrate adapts to the connection within this range. Default: 300–4000 kbit/s.</string>
+    <string name="call_video_bitrate_range_save_failed">Could not save the call video bitrate range. Try again.</string>
     <string name="call_jitter_hint">"%1$s s · applies to the next call"</string>
     <string name="voice_compressor">"Voice compressor"</string>
     <string name="lookback_time">"Lookback time:"</string>