VideoDecoder.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Threading.Tasks;
using Waher.Runtime.Inventory;
 
namespace Waher.Content.Video
{
    public class VideoDecoder : IContentDecoder
    {
        public VideoDecoder()
        {
        }
 
        public static readonly string[] VideoContentTypes = new string[] 
        {
            "video/mp4", 
            "video/mpeg", 
            "video/ogg", 
            "video/quicktime", 
            "video/webm", 
            "video/3gpp", 
            "video/3gpp2", 
            "video/x-la-asf", 
            "video/x-ms-asf", 
            "video/x-msvideo", 
            "video/x-sgi-movie",
            "video/x-flv",
            "video/x-ms-wmv"
        };
 
        public static readonly string[] VideoFileExtensions = new string[] 
        {
            "mp4",
            "m4a",
            "m4p",
            "m4b",
            "m4r",
            "m4v",
            "mp2", 
            "mpa", 
            "mpe", 
            "mpeg", 
            "mpg", 
            "mpv2", 
            "ogv", 
            "mov", 
            "qt", 
            "webm", 
            "lsf", 
            "lsx", 
            "asf",
            "asr",
            "asx",
            "avi",
            "movie",
            "3gp",
            "3g2",
            "flv",
            "wmv"
        };
 
        public string[] ContentTypes => VideoContentTypes;
 
        public string[] FileExtensions => VideoFileExtensions;
 
        public bool Decodes(string ContentType, out Grade Grade)
        {
            if (ContentType.StartsWith("video/"))
            {
                Grade = Grade.Barely;
                return true;
            }
            else
            {
                Grade = Grade.NotAtAll;
                return false;
            }
        }
 
        public Task<object> DecodeAsync(string ContentType, byte[] Data, Encoding Encoding, KeyValuePair<string, string>[] Fields, Uri BaseUri)
        {
            return Task.FromResult<object>(Data);
        }
 
        public bool TryGetContentType(string FileExtension, out string ContentType)
        {
            switch (FileExtension.ToLower())
            {
                case "mp4":
                case "m4a":
                case "m4p":
                case "m4b":
                case "m4r":
                case "m4v":
                    ContentType = "video/mp4";
                    return true;
                
                case "mp2":
                case "mpa":
                case "mpe":
                case "mpeg":
                case "mpg":
                case "mpv2":
                    ContentType = "video/mpeg";
                    return true;
 
                case "ogv":
                    ContentType = "video/ogg";
                    return true;
 
                case "mov":
                case "qt":
                    ContentType = "video/quicktime";
                    return true;
 
                case "webm":
                    ContentType = "video/webm";
                    return true;
 
                case "lsf":
                case "lsx":
                    ContentType = "video/x-la-asf";
                    return true;
 
                case "asf":
                case "asr":
                case "asx":
                    ContentType = "video/x-ms-asf";
                    return true;
 
                case "avi":
                    ContentType = "video/x-msvideo";
                    return true;
 
                case "movie":
                    ContentType = "video/x-sgi-movie";
                    return true;
                    
                case "3gp":
                    ContentType = "video/3gpp";
                    return true;
 
                case "3g2":
                    ContentType = "video/3gpp2";
                    return true;
 
                case "flv":
                    ContentType = "video/x-flv";
                    return true;
 
                case "wmv":
                    ContentType = "video/x-wmv";
                    return true;
 
                default:
                    ContentType = string.Empty;
                    return false;
            }
        }
 
        public bool TryGetFileExtension(string ContentType, out string FileExtension)
        {
            switch (ContentType.ToLower())
            {
                case "video/mp4":
                    FileExtension = "mp4";
                    return true;
 
                case "video/mpeg":
                    FileExtension = "mpg";
                    return true;
 
                case "video/ogg":
                    FileExtension = "ogv";
                    return true;
 
                case "video/quicktime":
                    FileExtension = "mov";
                    return true;
 
                case "video/webm":
                    FileExtension = "webm";
                    return true;
 
                case "video/x-la-asf":
                    FileExtension = "lsf";
                    return true;
 
                case "video/x-ms-asf":
                    FileExtension = "asf";
                    return true;
 
                case "video/x-msvideo":
                    FileExtension = "avi";
                    return true;
 
                case "video/x-sgi-movie":
                    FileExtension = "movie";
                    return true;
 
                case "video/3gpp":
                    FileExtension = "3gp";
                    return true;
 
                case "video/3gpp2":
                    FileExtension = "3g2";
                    return true;
 
                case "video/x-flv":
                    FileExtension = "flv";
                    return true;
 
                case "video/x-wmv":
                    FileExtension = "wmv";
                    return true;
 
                default:
                    FileExtension = string.Empty;
                    return false;
            }
        }
 
    }
}