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using System;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.Linq;
using System.Threading.Tasks;
using MediaBrowser.Controller.Events;
using MediaBrowser.Controller.FFMpeg;
using MediaBrowser.Model.Entities;
namespace MediaBrowser.Controller.Providers
{
[Export(typeof(BaseMetadataProvider))]
public class VideoInfoProvider : BaseMetadataProvider
{
public override bool Supports(BaseEntity item)
{
return item is Video;
}
public override MetadataProviderPriority Priority
{
// Give this second priority
// Give metadata xml providers a chance to fill in data first, so that we can skip this whenever possible
get { return MetadataProviderPriority.Second; }
}
public override async Task FetchAsync(BaseEntity item, ItemResolveEventArgs args)
{
await Task.Run(() =>
{
Video video = item as Video;
if (video.VideoType != VideoType.VideoFile)
{
// Not supported yet
return;
}
if (CanSkip(video))
{
return;
}
Fetch(video, FFProbe.Run(video));
});
}
private void Fetch(Video video, FFProbeResult data)
{
if (!string.IsNullOrEmpty(data.format.duration))
{
video.RunTimeTicks = TimeSpan.FromSeconds(double.Parse(data.format.duration)).Ticks;
}
if (!string.IsNullOrEmpty(data.format.bit_rate))
{
video.BitRate = int.Parse(data.format.bit_rate);
}
// For now, only read info about first video stream
// Files with multiple video streams are possible, but extremely rare
bool foundVideo = false;
foreach (MediaStream stream in data.streams)
{
if (stream.codec_type.Equals("video", StringComparison.OrdinalIgnoreCase))
{
if (!foundVideo)
{
FetchFromVideoStream(video, stream);
}
foundVideo = true;
}
else if (stream.codec_type.Equals("audio", StringComparison.OrdinalIgnoreCase))
{
FetchFromAudioStream(video, stream);
}
}
}
private void FetchFromVideoStream(Video video, MediaStream stream)
{
video.Codec = stream.codec_name;
video.Width = stream.width;
video.Height = stream.height;
video.AspectRatio = stream.display_aspect_ratio;
if (!string.IsNullOrEmpty(stream.avg_frame_rate))
{
string[] parts = stream.avg_frame_rate.Split('/');
if (parts.Length == 2)
{
video.FrameRate = float.Parse(parts[0]) / float.Parse(parts[1]);
}
else
{
video.FrameRate = float.Parse(parts[0]);
}
}
}
private void FetchFromAudioStream(Video video, MediaStream stream)
{
AudioStream audio = new AudioStream();
audio.Codec = stream.codec_name;
if (!string.IsNullOrEmpty(stream.bit_rate))
{
audio.BitRate = int.Parse(stream.bit_rate);
}
audio.Channels = stream.channels;
if (!string.IsNullOrEmpty(stream.sample_rate))
{
audio.SampleRate = int.Parse(stream.sample_rate);
}
audio.Language = AudioInfoProvider.GetDictionaryValue(stream.tags, "language");
List<AudioStream> streams = (video.AudioStreams ?? new AudioStream[] { }).ToList();
streams.Add(audio);
video.AudioStreams = streams;
}
/// <summary>
/// Determines if there's already enough info in the Video object to allow us to skip running ffprobe
/// </summary>
private bool CanSkip(Video video)
{
if (video.AudioStreams == null || !video.AudioStreams.Any())
{
return false;
}
if (string.IsNullOrEmpty(video.AspectRatio))
{
return false;
}
if (string.IsNullOrEmpty(video.Codec))
{
return false;
}
if (string.IsNullOrEmpty(video.ScanType))
{
return false;
}
if (!video.RunTimeTicks.HasValue || video.RunTimeTicks.Value == 0)
{
return false;
}
if (video.FrameRate == 0 || video.Height == 0 || video.Width == 0 || video.BitRate == 0)
{
return false;
}
return true;
}
public override void Init()
{
base.Init();
AudioInfoProvider.EnsureCacheSubFolders(Kernel.Instance.ApplicationPaths.FFProbeVideoCacheDirectory);
}
}
}
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