protected override async Task <Either <BaseError, Process> > GetProcess(
GetPlayoutItemProcessByChannelNumber _,
Channel channel,
string ffmpegPath)
{
DateTimeOffset now = DateTimeOffset.Now;
Either <BaseError, PlayoutItemWithPath> maybePlayoutItem = await _playoutRepository
.GetPlayoutItem(channel.Id, now)
.Map(o => o.ToEither <BaseError>(new UnableToLocatePlayoutItem()))
.BindT(ValidatePlayoutItemPath);
return(await maybePlayoutItem.Match(
async playoutItemWithPath =>
{
MediaVersion version = playoutItemWithPath.PlayoutItem.MediaItem switch
{
Movie m => m.MediaVersions.Head(),
Episode e => e.MediaVersions.Head(),
_ => throw new ArgumentOutOfRangeException(nameof(playoutItemWithPath))
};
bool saveReports = await _configElementRepository.GetValue <bool>(ConfigElementKey.FFmpegSaveReports)
.Map(result => result.IfNone(false));
return Right <BaseError, Process>(
_ffmpegProcessService.ForPlayoutItem(
ffmpegPath,
saveReports,
channel,
version,
playoutItemWithPath.Path,
playoutItemWithPath.PlayoutItem.StartOffset,
now));
},
async error =>
{
var offlineTranscodeMessage =
$"offline image is unavailable because transcoding is disabled in ffmpeg profile '{channel.FFmpegProfile.Name}'";
Option <TimeSpan> maybeDuration = await Optional(channel.FFmpegProfile.Transcode)
.Filter(transcode => transcode)
.Match(
_ => _playoutRepository.GetNextItemStart(channel.Id, now)
.MapT(nextStart => nextStart - now),
() => Option <TimeSpan> .None.AsTask());
switch (error)
{
case UnableToLocatePlayoutItem:
if (channel.FFmpegProfile.Transcode)
{
return _ffmpegProcessService.ForError(
ffmpegPath,
channel,
maybeDuration,
"Channel is Offline");
}
else
{
var message =
$"Unable to locate playout item for channel {channel.Number}; {offlineTranscodeMessage}";
return BaseError.New(message);
}
case PlayoutItemDoesNotExistOnDisk:
if (channel.FFmpegProfile.Transcode)
{
return _ffmpegProcessService.ForError(ffmpegPath, channel, maybeDuration, error.Value);
}
else
{
var message =
$"Playout item does not exist on disk for channel {channel.Number}; {offlineTranscodeMessage}";
return BaseError.New(message);
}
default:
if (channel.FFmpegProfile.Transcode)
{
return _ffmpegProcessService.ForError(
ffmpegPath,
channel,
maybeDuration,
"Channel is Offline");
}
else
{
var message =
$"Unexpected error locating playout item for channel {channel.Number}; {offlineTranscodeMessage}";
return BaseError.New(message);
}
}
}));
}
