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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using MediaBrowser.Model.Entities;
namespace MediaBrowser.Api.HttpHandlers
{
/// <summary>
/// Supported output formats: mkv,m4v,mp4,asf,wmv,mov,webm,ogv,3gp,avi,ts,flv
/// </summary>
class VideoHandler : BaseMediaHandler<Video>
{
/// <summary>
/// We can output these files directly, but we can't encode them
/// </summary>
protected override IEnumerable<string> UnsupportedOutputEncodingFormats
{
get
{
return new string[] { "mp4", "wmv", "3gp", "avi", "ogv", "mov", "m4v", "mkv" };
}
}
protected override bool RequiresConversion()
{
string currentFormat = Path.GetExtension(LibraryItem.Path).Replace(".", string.Empty);
// For now we won't allow these to pass through.
// Later we'll add some intelligence to allow it when possible
if (currentFormat.Equals("mp4", StringComparison.OrdinalIgnoreCase) || currentFormat.Equals("mkv", StringComparison.OrdinalIgnoreCase) || currentFormat.Equals("m4v", StringComparison.OrdinalIgnoreCase))
{
return true;
}
if (base.RequiresConversion())
{
return true;
}
AudioStream audio = LibraryItem.AudioStreams.FirstOrDefault();
if (audio != null)
{
// If the number of channels is greater than our desired channels, we need to transcode
if (AudioChannels.HasValue && AudioChannels.Value < audio.Channels)
{
return true;
}
}
// Yay
return false;
}
/// <summary>
/// Translates the file extension to the format param that follows "-f" on the ffmpeg command line
/// </summary>
private string GetFFMpegOutputFormat(string outputFormat)
{
if (outputFormat.Equals("mkv", StringComparison.OrdinalIgnoreCase))
{
return "matroska";
}
else if (outputFormat.Equals("ts", StringComparison.OrdinalIgnoreCase))
{
return "mpegts";
}
else if (outputFormat.Equals("ogv", StringComparison.OrdinalIgnoreCase))
{
return "ogg";
}
return outputFormat;
}
/// <summary>
/// Creates arguments to pass to ffmpeg
/// </summary>
protected override string GetCommandLineArguments()
{
List<string> audioTranscodeParams = new List<string>();
string outputFormat = GetConversionOutputFormat();
return string.Format("-i \"{0}\" -threads 0 {1} {2} -f {3} -",
LibraryItem.Path,
GetVideoArguments(outputFormat),
GetAudioArguments(outputFormat),
GetFFMpegOutputFormat(outputFormat)
);
}
private string GetVideoArguments(string outputFormat)
{
string codec = GetVideoCodec(outputFormat);
string args = "-vcodec " + codec;
return args;
}
private string GetAudioArguments(string outputFormat)
{
AudioStream audioStream = LibraryItem.AudioStreams.FirstOrDefault();
if (audioStream == null)
{
return string.Empty;
}
string codec = GetAudioCodec(audioStream, outputFormat);
string args = "-acodec " + codec;
if (!codec.Equals("copy", StringComparison.OrdinalIgnoreCase))
{
int? channels = GetNumAudioChannelsParam(codec, audioStream.Channels);
if (channels.HasValue)
{
args += " -ac " + channels.Value;
}
int? sampleRate = GetSampleRateParam(audioStream.SampleRate);
if (sampleRate.HasValue)
{
args += " -ar " + sampleRate.Value;
}
}
return args;
}
private string GetVideoCodec(string outputFormat)
{
if (outputFormat.Equals("webm"))
{
// Per webm specification, it must be vpx
return "libvpx";
}
else if (outputFormat.Equals("asf"))
{
return "wmv2";
}
return "libx264";
}
private string GetAudioCodec(AudioStream audioStream, string outputFormat)
{
if (outputFormat.Equals("webm"))
{
// Per webm specification, it must be vorbis
return "libvorbis";
}
// See if we can just copy the stream
if (HasBasicAudio(audioStream))
{
return "copy";
}
return "libvo_aacenc";
}
private int? GetNumAudioChannelsParam(string audioCodec, int libraryItemChannels)
{
if (libraryItemChannels > 2 && audioCodec.Equals("libvo_aacenc"))
{
// libvo_aacenc currently only supports two channel output
return 2;
}
return GetNumAudioChannelsParam(libraryItemChannels);
}
private bool HasBasicAudio(AudioStream audio)
{
int maxChannels = AudioChannels ?? 2;
if (audio.Channels > maxChannels)
{
return false;
}
if (audio.AudioFormat.IndexOf("aac", StringComparison.OrdinalIgnoreCase) != -1)
{
return true;
}
if (audio.AudioFormat.IndexOf("ac-3", StringComparison.OrdinalIgnoreCase) != -1 || audio.AudioFormat.IndexOf("ac3", StringComparison.OrdinalIgnoreCase) != -1)
{
return true;
}
if (audio.AudioFormat.IndexOf("mpeg", StringComparison.OrdinalIgnoreCase) != -1 || audio.AudioFormat.IndexOf("mp3", StringComparison.OrdinalIgnoreCase) != -1)
{
return true;
}
return false;
}
}
}
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