From fdbd273104f3f5ba8f311683c9107a759e60862a Mon Sep 17 00:00:00 2001
From: Joseph Tam <josephnhtam@gmail.com>
Date: Wed, 18 Sep 2024 09:31:54 +0800
Subject: [PATCH] feat: expose stream index

---
 .../Program.cs                                | 33 +++++++++++++++++++
 .../AdaptiveHlsTranscoderConfiguration.cs     |  3 +-
 .../AdaptiveHlsTranscoder.Arguments.cs        |  2 +-
 ...eStreamingServerNet.StreamProcessor.csproj |  2 +-
 4 files changed, 37 insertions(+), 3 deletions(-)

diff --git a/samples/LiveStreamingServerNet.AdaptiveHlsDemo/Program.cs b/samples/LiveStreamingServerNet.AdaptiveHlsDemo/Program.cs
index 24068667..87cf15fe 100644
--- a/samples/LiveStreamingServerNet.AdaptiveHlsDemo/Program.cs
+++ b/samples/LiveStreamingServerNet.AdaptiveHlsDemo/Program.cs
@@ -1,5 +1,6 @@
 using LiveStreamingServerNet.StreamProcessor.AspNetCore.Installer;
 using LiveStreamingServerNet.StreamProcessor.Contracts;
+using LiveStreamingServerNet.StreamProcessor.Hls.Configurations;
 using LiveStreamingServerNet.StreamProcessor.Installer;
 using LiveStreamingServerNet.StreamProcessor.Utilities;
 using LiveStreamingServerNet.Utilities.Contracts;
@@ -51,6 +52,38 @@ private static IServiceCollection AddLiveStreamingServer(this IServiceCollection
                         options.FFmpegPath = ExecutableFinder.FindExecutableFromPATH("ffmpeg")!;
                         options.FFprobePath = ExecutableFinder.FindExecutableFromPATH("ffprobe")!;
 
+                        options.DownsamplingFilters =
+                        [
+                            new DownsamplingFilter(
+                                Name: "360p",
+                                Height: 360,
+                                MaxVideoBitrate: "600k",
+                                MaxAudioBitrate: "64k"
+                            ),
+
+                            new DownsamplingFilter(
+                                Name: "480p",
+                                Height: 480,
+                                MaxVideoBitrate: "1500k",
+                                MaxAudioBitrate: "128k"
+                            ),
+
+                            new DownsamplingFilter(
+                                Name: "720p",
+                                Height: 720,
+                                MaxVideoBitrate: "3000k",
+                                MaxAudioBitrate: "256k"
+                            ),
+
+                            new DownsamplingFilter(
+                                Name: "720p_rotated",
+                                Height: 720,
+                                MaxVideoBitrate: "3000k",
+                                MaxAudioBitrate: "256k",
+                                ExtraArguments: (streamIndex) => $"-filter:v:{streamIndex} transpose=1"
+                            ),
+                        ];
+
                         // Hardware acceleration 
                         // options.VideoDecodingArguments = "-hwaccel auto -c:v h264_cuvid";
                         // options.VideoEncodingArguments = "-c:v h264_nvenc -g 30";
diff --git a/src/LiveStreamingServerNet.StreamProcessor/Hls/Configurations/AdaptiveHlsTranscoderConfiguration.cs b/src/LiveStreamingServerNet.StreamProcessor/Hls/Configurations/AdaptiveHlsTranscoderConfiguration.cs
index 201ce54f..b1b838e9 100644
--- a/src/LiveStreamingServerNet.StreamProcessor/Hls/Configurations/AdaptiveHlsTranscoderConfiguration.cs
+++ b/src/LiveStreamingServerNet.StreamProcessor/Hls/Configurations/AdaptiveHlsTranscoderConfiguration.cs
@@ -57,5 +57,6 @@ public record HlsOptions(
         string? ExtraArguments = null
     );
 
-    public record DownsamplingFilter(string Name, int Height, string MaxVideoBitrate, string MaxAudioBitrate, string? ExtraArguments = null);
+    public delegate string ExtraFilterArguments(int streamIndex);
+    public record DownsamplingFilter(string Name, int Height, string MaxVideoBitrate, string MaxAudioBitrate, ExtraFilterArguments? ExtraArguments = null);
 }
\ No newline at end of file
diff --git a/src/LiveStreamingServerNet.StreamProcessor/Internal/Hls/AdaptiveTranscoding/AdaptiveHlsTranscoder.Arguments.cs b/src/LiveStreamingServerNet.StreamProcessor/Internal/Hls/AdaptiveTranscoding/AdaptiveHlsTranscoder.Arguments.cs
index 52510250..e8ef262b 100644
--- a/src/LiveStreamingServerNet.StreamProcessor/Internal/Hls/AdaptiveTranscoding/AdaptiveHlsTranscoder.Arguments.cs
+++ b/src/LiveStreamingServerNet.StreamProcessor/Internal/Hls/AdaptiveTranscoding/AdaptiveHlsTranscoder.Arguments.cs
@@ -89,7 +89,7 @@ private static void AddDownsamplingFilters(IList<DownsamplingFilter> downsamplin
                 arguments.Add($"-maxrate:v:{i} {filter.MaxVideoBitrate}");
                 arguments.Add($"-b:a:{i} {filter.MaxAudioBitrate}");
 
-                AddOptionalArgument(arguments, filter.ExtraArguments);
+                AddOptionalArgument(arguments, filter.ExtraArguments?.Invoke(i));
             }
         }
 
diff --git a/src/LiveStreamingServerNet.StreamProcessor/LiveStreamingServerNet.StreamProcessor.csproj b/src/LiveStreamingServerNet.StreamProcessor/LiveStreamingServerNet.StreamProcessor.csproj
index f1a28300..1996fa9b 100644
--- a/src/LiveStreamingServerNet.StreamProcessor/LiveStreamingServerNet.StreamProcessor.csproj
+++ b/src/LiveStreamingServerNet.StreamProcessor/LiveStreamingServerNet.StreamProcessor.csproj
@@ -10,7 +10,7 @@
     <PackageTags>live-streaming;rtmp;transmuxer;transcoder;hls;dash</PackageTags>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <PublishRepositoryUrl>true</PublishRepositoryUrl>
-    <Version>0.14.2</Version>
+    <Version>0.14.3</Version>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
   </PropertyGroup>