From f2858878d166df214aee20f2dc0710b766285c91 Mon Sep 17 00:00:00 2001
From: Andreas B <6439218+YouKnowBlom@users.noreply.github.com>
Date: Wed, 11 Mar 2020 18:14:36 +0100
Subject: Add CODECS field to HLS master playlist

---
 .../Playback/Hls/HlsCodecStringFactory.cs          | 126 +++++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 MediaBrowser.Api/Playback/Hls/HlsCodecStringFactory.cs

(limited to 'MediaBrowser.Api/Playback/Hls/HlsCodecStringFactory.cs')

diff --git a/MediaBrowser.Api/Playback/Hls/HlsCodecStringFactory.cs b/MediaBrowser.Api/Playback/Hls/HlsCodecStringFactory.cs
new file mode 100644
index 000000000..3bbb77a65
--- /dev/null
+++ b/MediaBrowser.Api/Playback/Hls/HlsCodecStringFactory.cs
@@ -0,0 +1,126 @@
+using System;
+using System.Text;
+
+
+namespace MediaBrowser.Api.Playback
+{
+    /// <summary>
+    /// Get various codec strings for use in HLS playlists.
+    /// </summary>
+    static class HlsCodecStringFactory
+    {
+
+        /// <summary>
+        /// Gets a MP3 codec string.
+        /// </summary>
+        /// <returns>MP3 codec string.</returns>
+        public static string GetMP3String()
+        {
+            return "mp4a.40.34";
+        }
+
+        /// <summary>
+        /// Gets an AAC codec string.
+        /// </summary>
+        /// <param name="profile">AAC profile.</param>
+        /// <returns>AAC codec string.</returns>
+        public static string GetAACString(string profile)
+        {
+            StringBuilder result = new StringBuilder("mp4a", 9);
+
+            if (string.Equals(profile, "HE", StringComparison.OrdinalIgnoreCase))
+            {
+                result.Append(".40.5");
+            }
+            else
+            {
+                // Default to LC if profile is invalid
+                result.Append(".40.2");
+            }
+
+            return result.ToString();
+        }
+
+        /// <summary>
+        /// Gets a H.264 codec string.
+        /// </summary>
+        /// <param name="profile">H.264 profile.</param>
+        /// <param name="level">H.264 level.</param>
+        /// <returns>H.264 string.</returns>
+        public static string GetH264String(string profile, int level)
+        {
+            StringBuilder result = new StringBuilder("avc1", 11);
+
+            if (string.Equals(profile, "high", StringComparison.OrdinalIgnoreCase))
+            {
+                result.Append(".6400");
+            }
+            else if (string.Equals(profile, "main", StringComparison.OrdinalIgnoreCase))
+            {
+                result.Append(".4D40");
+            }
+            else if (string.Equals(profile, "baseline", StringComparison.OrdinalIgnoreCase))
+            {
+                result.Append(".42E0");
+            }
+            else
+            {
+                // Default to constrained baseline if profile is invalid
+                result.Append(".4240");
+            }
+
+            string levelHex = level.ToString("X2");
+            result.Append(levelHex);
+
+            return result.ToString();
+        }
+
+        /// <summary>
+        /// Gets a H.265 codec string.
+        /// </summary>
+        /// <param name="profile">H.265 profile.</param>
+        /// <param name="level">H.265 level.</param>
+        /// <returns>H.265 string.</returns>
+        public static string GetH265String(string profile, int level)
+        {
+            // The h265 syntax is a bit of a mystery at the time this comment was written.
+            // This is what I've found through various sources:
+            // FORMAT: [codecTag].[profile].[constraint?].L[level * 30].[UNKNOWN]
+            StringBuilder result = new StringBuilder("hev1", 16);
+
+            if (string.Equals(profile, "main10", StringComparison.OrdinalIgnoreCase))
+            {
+                result.Append(".2.6");
+            }
+            else
+            {
+                // Default to main if profile is invalid
+                result.Append(".1.6");
+            }
+
+            result.Append(".L")
+                .Append(level * 3)
+                .Append(".B0");
+
+            return result.ToString();
+        }
+
+        /// <summary>
+        /// Gets an AC-3 codec string.
+        /// </summary>
+        /// <returns>AC-3 codec string.</returns>
+        public static string GetAC3String()
+        {
+            return "mp4a.a5";
+        }
+
+        /// <summary>
+        /// Gets an E-AC-3 codec string.
+        /// </summary>
+        /// <returns>E-AC-3 codec string.</returns>
+        public static string GetEAC3String()
+        {
+            return "mp4a.a6";
+        }
+    }
+}
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