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