[AudioTranscoding] Add FLAC as supported target audio format and be able to define the corresponding target sample rate

MediaBrowser.Controller/MediaEncoding/EncodingJobInfo.cs

@@ -404,7 +404,10 @@ namespace MediaBrowser.Controller.MediaEncoding
                 {
                     // Don't exceed what the encoder supports
                     // Seeing issues of attempting to encode to 88200
-                    return Math.Min(44100, BaseRequest.AudioSampleRate.Value);
+                    // return Math.Min(44100, BaseRequest.AudioSampleRate.Value);
+
+                    // I don't see any reason why limiting the sample rate to a maximum of 44100 !
+                    return BaseRequest.AudioSampleRate.Value;
                 }
 
                 return null;

MediaBrowser.MediaEncoding/Encoder/EncoderValidator.cs

@@ -25,6 +25,7 @@ namespace MediaBrowser.MediaEncoding.Encoder
             "ac3",
             "aac",
             "mp3",
+            "flac",
             "h264_qsv",
             "hevc_qsv",
             "mpeg2_qsv",
@@ -71,6 +72,7 @@ namespace MediaBrowser.MediaEncoding.Encoder
             "libmp3lame",
             "libopus",
             "libvorbis",
+            "flac",
             "srt",
             "h264_amf",
             "hevc_amf",

MediaBrowser.Model/Dlna/StreamBuilder.cs

@@ -1438,6 +1438,32 @@ namespace MediaBrowser.Model.Dlna
                             break;
                         }
 
+                    case ProfileConditionValue.AudioSampleRate:
+                        {
+                            if (!enableNonQualifiedConditions)
+                            {
+                                continue;
+                            }
+
+                            if (int.TryParse(value, NumberStyles.Any, CultureInfo.InvariantCulture, out var num))
+                            {
+                                if (condition.Condition == ProfileConditionType.Equals)
+                                {
+                                    item.AudioSampleRate = num;
+                                }
+                                else if (condition.Condition == ProfileConditionType.LessThanEqual)
+                                {
+                                    item.AudioSampleRate = Math.Min(num, item.AudioSampleRate ?? num);
+                                }
+                                else if (condition.Condition == ProfileConditionType.GreaterThanEqual)
+                                {
+                                    item.AudioSampleRate = Math.Max(num, item.AudioSampleRate ?? num);
+                                }
+                            }
+
+                            break;
+                        }
+
                     case ProfileConditionValue.AudioChannels:
                         {
                             if (string.IsNullOrEmpty(qualifier))

MediaBrowser.Model/Dlna/StreamInfo.cs

@@ -110,6 +110,8 @@ namespace MediaBrowser.Model.Dlna
 
         public int? AudioBitrate { get; set; }
 
+        public int? AudioSampleRate { get; set; }
+
         public int? VideoBitrate { get; set; }
 
         public int? MaxWidth { get; set; }
@@ -184,7 +186,7 @@ namespace MediaBrowser.Model.Dlna
                 }
 
                 if (string.Equals(pair.Name, "Static", StringComparison.OrdinalIgnoreCase) &&
-                    string.Equals(pair.Value, "false", StringComparison.OrdinalIgnoreCase))
+                    string.Equals(pair.Value, "true", StringComparison.OrdinalIgnoreCase))
                 {
                     continue;
                 }
@@ -250,6 +252,7 @@ namespace MediaBrowser.Model.Dlna
             list.Add(new NameValuePair("SubtitleStreamIndex", item.SubtitleStreamIndex.HasValue && item.SubtitleDeliveryMethod != SubtitleDeliveryMethod.External ? item.SubtitleStreamIndex.Value.ToString(CultureInfo.InvariantCulture) : string.Empty));
             list.Add(new NameValuePair("VideoBitrate", item.VideoBitrate.HasValue ? item.VideoBitrate.Value.ToString(CultureInfo.InvariantCulture) : string.Empty));
             list.Add(new NameValuePair("AudioBitrate", item.AudioBitrate.HasValue ? item.AudioBitrate.Value.ToString(CultureInfo.InvariantCulture) : string.Empty));
+            list.Add(new NameValuePair("AudioSampleRate", item.AudioSampleRate.HasValue ? item.AudioSampleRate.Value.ToString(CultureInfo.InvariantCulture) : string.Empty));
 
             list.Add(new NameValuePair("MaxFramerate", item.MaxFramerate.HasValue ? item.MaxFramerate.Value.ToString(CultureInfo.InvariantCulture) : string.Empty));
             list.Add(new NameValuePair("MaxWidth", item.MaxWidth.HasValue ? item.MaxWidth.Value.ToString(CultureInfo.InvariantCulture) : string.Empty));
@@ -521,7 +524,9 @@ namespace MediaBrowser.Model.Dlna
             get
             {
                 var stream = TargetAudioStream;
-                return stream == null ? null : stream.SampleRate;
+                return AudioSampleRate.HasValue && !IsDirectStream
+                    ? AudioSampleRate
+                    : stream == null ? null : stream.SampleRate;
             }
         }