/// <summary>
/// Gets a formatted string of the output video codec, for use in the CODECS field.
/// </summary>
/// <seealso cref="AppendPlaylistCodecsField(StringBuilder, StreamState)"/>
/// <seealso cref="GetPlaylistAudioCodecs(StreamState)"/>
/// <param name="state">StreamState of the current stream.</param>
/// <returns>Formatted video codec string.</returns>
private string GetPlaylistVideoCodecs(StreamState state, string codec, int level)
{
if (level == 0)
{
// This is 0 when there's no requested H.26X level in the device profile
// and the source is not encoded in H.26X
Logger.LogError("Got invalid H.26X level when building CODECS field for HLS master playlist");
return(string.Empty);
}
if (string.Equals(codec, "h264", StringComparison.OrdinalIgnoreCase))
{
string profile = state.GetRequestedProfiles("h264").FirstOrDefault();
return(HlsCodecStringFactory.GetH264String(profile, level));
}
else if (string.Equals(codec, "h265", StringComparison.OrdinalIgnoreCase) ||
string.Equals(codec, "hevc", StringComparison.OrdinalIgnoreCase))
{
string profile = state.GetRequestedProfiles("h265").FirstOrDefault();
return(HlsCodecStringFactory.GetH265String(profile, level));
}
return(string.Empty);
}
/// <summary>
/// Gets a formatted string of the output audio codec, for use in the CODECS field.
/// </summary>
/// <seealso cref="AppendPlaylistCodecsField(StringBuilder, StreamState)"/>
/// <seealso cref="GetPlaylistVideoCodecs(StreamState, string, int)"/>
/// <param name="state">StreamState of the current stream.</param>
/// <returns>Formatted audio codec string.</returns>
private string GetPlaylistAudioCodecs(StreamState state)
{
if (string.Equals(state.ActualOutputAudioCodec, "aac", StringComparison.OrdinalIgnoreCase))
{
string?profile = state.GetRequestedProfiles("aac").FirstOrDefault();
return(HlsCodecStringHelpers.GetAACString(profile));
}
if (string.Equals(state.ActualOutputAudioCodec, "mp3", StringComparison.OrdinalIgnoreCase))
{
return(HlsCodecStringHelpers.GetMP3String());
}
if (string.Equals(state.ActualOutputAudioCodec, "ac3", StringComparison.OrdinalIgnoreCase))
{
return(HlsCodecStringHelpers.GetAC3String());
}
if (string.Equals(state.ActualOutputAudioCodec, "eac3", StringComparison.OrdinalIgnoreCase))
{
return(HlsCodecStringHelpers.GetEAC3String());
}
if (string.Equals(state.ActualOutputAudioCodec, "flac", StringComparison.OrdinalIgnoreCase))
{
return(HlsCodecStringHelpers.GetFLACString());
}
if (string.Equals(state.ActualOutputAudioCodec, "alac", StringComparison.OrdinalIgnoreCase))
{
return(HlsCodecStringHelpers.GetALACString());
}
return(string.Empty);
}
/// <summary>
/// Get the H.26X profile of the output video stream.
/// </summary>
/// <param name="state">StreamState of the current stream.</param>
/// <param name="codec">Video codec.</param>
/// <returns>H.26X profile of the output video stream.</returns>
private string GetOutputVideoCodecProfile(StreamState state, string codec)
{
string profileString = string.Empty;
if (EncodingHelper.IsCopyCodec(state.OutputVideoCodec) &&
!string.IsNullOrEmpty(state.VideoStream.Profile))
{
profileString = state.VideoStream.Profile;
}
else if (!string.IsNullOrEmpty(codec))
{
profileString = state.GetRequestedProfiles(codec).FirstOrDefault() ?? string.Empty;
if (string.Equals(state.ActualOutputVideoCodec, "h264", StringComparison.OrdinalIgnoreCase))
{
profileString ??= "high";
}
if (string.Equals(state.ActualOutputVideoCodec, "h265", StringComparison.OrdinalIgnoreCase) ||
string.Equals(state.ActualOutputVideoCodec, "hevc", StringComparison.OrdinalIgnoreCase))
{
profileString ??= "main";
}
}
return(profileString);
}