示例#1
0
        /// <summary>
        /// Parse a HLSStream object from a string
        /// </summary>
        /// <param name="m3u8">The string</param>
        /// <returns>Returns a parsed HLSStream object</returns>
        private static HLSStream ParseFromString(string m3u8)
        {
            string[]             lines  = m3u8.Split('\n');
            HLSStream            STREAM = new HLSStream();
            List <HLSStreamPart> PARTS  = new List <HLSStreamPart>();

            for (int i = 0; i < lines.Length; i++)
            {
                string line = lines[i];

                if (line.Contains("TARGETDURATION"))
                {
                    STREAM.TargetDuration = line.Split(':')[1];
                }

                if (line.Contains("ALLOW-CACHE"))
                {
                    STREAM.AllowCache = line.Split(':')[1];
                }

                if (line.Contains("PLAYLIST-TYPE"))
                {
                    STREAM.PlaylistType = line.Split(':')[1];
                }

                if (line.Contains("KEY"))
                {
                    STREAM.Key = new HLSEncryptionKey(line.Split(':')[1]);
                }

                if (line.Contains("VERSION"))
                {
                    STREAM.Version = line.Split(':')[1];
                }

                if (line.Contains("MEDIA-SEQUENCE"))
                {
                    STREAM.MediaSequence = line.Split(':')[1];
                }

                if (line.Contains("EXTINF"))
                {
                    PARTS.Add(new HLSStreamPart(line, lines[i + 1]));
                    i = i + 2;
                }
            }

            STREAM.Parts = PARTS.ToArray();

            return(STREAM);
        }
示例#2
0
        /// <summary>
        /// Parse a HLSStream object from a string
        /// </summary>
        /// <param name="m3u8">The string</param>
        /// <returns>Returns a parsed HLSStream object</returns>
        private static HLSStream ParseFromString(string m3u8)
        {
            string[]             lines    = m3u8.Split(Environment.NewLine.ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
            HLSStream            STREAM   = new HLSStream();
            List <HLSStreamPart> PARTS    = new List <HLSStreamPart>();
            List <HLSPlaylist>   Playlist = new List <HLSPlaylist>();

            string line;

            for (int i = 0; i < lines.Length; i++)
            {
                line = lines[i];

                if (line.Contains("EXTINF"))
                {
                    /*
                     * 指定每个媒体段(ts)的持续时间,这个仅对其后面的 URI 有效,每两个媒体段 URI 间被这个 tag 分隔开
                     * 其格式为:#EXTINF:<duration>,<title>
                     */
                    PARTS.Add(new HLSStreamPart(line, lines[i + 1]));
                    i = i + 1;
                    continue;
                }
                else if (line.Contains("EXT-X-ENDLIST"))
                {
                    break;
                }
                else if (line.Contains("EXT-X-STREAM-INF"))
                {
                    /*
                     * 指定一个包含多媒体信息的 media URI 作为 Playlist,一般做 m3u8 的嵌套使用,它只对紧跟后面的 URI 有效,格式如下:#EXT-X-STREAM-INF:<attribute-list>
                     * 常用的属性如下:
                     * BANDWIDTH:带宽,必须有
                     * PROGRAM-ID:该值是一个十进制整数,唯一地标识一个在 Playlist 文件范围内的特定的描述。一个 Playlist 文件中可能包含多个有相同 ID 的此 tag
                     * CODECS:指定流的编码类型,不是必须的
                     * RESOLUTION:分辨率
                     * AUDIO:这个值必须和 AUDIO 类别的 "EXT-X-MEDIA" 标签中 "GROUP-ID" 属性值相匹配
                     * VIDEO:同上
                     */
                    #region 多码率适配流
                    var tmpPlaylist = new HLSPlaylist();

                    //#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=800000,RESOLUTION=720x406,CODECS="avc1.4d401f,mp4a.40.2"
                    var tmpItems    = line.Split("\"".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
                    var codecsValue = "";
                    var tmpLine     = line;
                    if (tmpItems.Length == 2)
                    {
                        tmpLine     = tmpItems[0];
                        codecsValue = tmpItems[1];
                    }
                    var items = tmpLine.Split("#:,".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
                    for (var si = 1 /*跳过EXT-X-STREAM-INF*/; si < items.Length; si++)
                    {
                        var keyValue = items[si].Split("=".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
                        switch (keyValue[0])
                        {
                        case "BANDWIDTH":
                            tmpPlaylist.BANDWIDTH = keyValue[1];
                            break;

                        case "CODECS":
                            tmpPlaylist.CODECS = codecsValue;    // keyValue[1];
                            break;

                        case "PROGRAM-ID":
                            tmpPlaylist.PROGRAM_ID = keyValue[1];
                            break;

                        case "RESOLUTION":
                            tmpPlaylist.RESOLUTION = keyValue[1];
                            break;

                        case "AUDIO":
                            tmpPlaylist.AUDIO = keyValue[1];
                            break;

                        case "VIDEO":
                            tmpPlaylist.VIDEO = keyValue[1];
                            break;

                        default:
                            break;
                        }
                    }

                    //
                    tmpPlaylist.URI = lines[i + 1];
                    i = i + 1;

                    Playlist.Add(tmpPlaylist);
                    #endregion
                    continue;
                }
                else if (line.Contains("EXT-X-KEY"))
                {
                    /*
                     * 表示怎么对 media segments 进行解码。其作用范围是下次该 tag 出现前的所有 media URI。
                     * 格式为:#EXT-X-KEY:<attribute-list>
                     * NONE 或者 AES-128。如果是 NONE,则 URI 以及 IV 属性必须不存在,如果是 AES-128(Advanced Encryption Standard),则 URI 必须存在,IV 可以不存在。
                     * 对于 AES-128 的情况,keytag 和 URI 属性共同表示了一个 key 文件,通过 URI 可以获得这个 key,如果没有 IV(Initialization Vector),则使用序列号作为 IV 进行编解码,将序列号的高位赋到 16 个字节的 buffer 中,左边补 0;如果有 IV,则将该值当成 16 个字节的 16 进制数。
                     */
                    STREAM.Key = new HLSEncryptionKey(line.Substring(line.IndexOf(':') + 1));
                    continue;
                }
                else if (line.Contains("EXT-X-TARGETDURATION"))
                {
                    /*
                     * 指定当前视频流中的单个切片(即 ts)文件的最大时长(秒)。所以 #EXTINF 中指定的时间长度必须小于或是等于这个最大值。这个 tag 在整个 Playlist 文件中只能出现一次(在嵌套的情况下,一般有真正
                     * ts url 的 m3u8 才会出现该 tag)。格式为:#EXT-X-TARGETDURATION:<s>
                     */
                    STREAM.TargetDuration = line.Split(':')[1];
                    continue;
                }
                else if (line.Contains("EXT-X-ALLOW-CACHE"))
                {
                    STREAM.AllowCache = line.Split(':')[1];
                    continue;
                }
                else if (line.Contains("EXT-X-PLAYLIST-TYPE"))
                {
                    /*
                     # EXT-X-PLAYLIST-TYPE:<EVENT|VOD>
                     # VOD,即为点播视频,服务器不能改变 Playlist 文件,换句话说就是该视频全部的 ts 文件已经被生成好了
                     # EVENT,就是实时生成 m3u8 和 ts 文件。服务器不能改变或是删除 Playlist 文件中的任何部分,但是可以向该文件中增加新的一行内容。它的索引文件一直处于动态变化中,播放的时候需要不断下载二级 index 文件
                     */
                    STREAM.PlaylistType = line.Split(':')[1];
                    continue;
                }
                else if (line.Contains("EXT-X-VERSION"))
                {
                    STREAM.Version = line.Split(':')[1];
                    continue;
                }
                else if (line.Contains("EXT-X-MEDIA-SEQUENCE"))
                {
                    STREAM.MediaSequence = line.Split(':')[1];
                    continue;
                }
                else if (line.Contains("EXTM3U"))
                {
                    continue;
                }
                else if (line.Contains("EXT-X-BYTERANGE"))
                {
                    /*
                     * 表示媒体段是一个媒体 URI 资源中的一段,只对其后的 media URI 有效,
                     * 格式为:#EXT-X-BYTERANGE:<n>[@o]
                     * n:表示这个区间的大小
                     * o:表示在 URI 中的 offset
                     */
                    STREAM.ByteRange = line.Substring(line.IndexOf(':') + 1);
                    continue;
                }
                else if (line.Contains("EXT-X-PROGRAM-DATE-TIME"))//#EXT-X-PROGRAM-DATE-TIME:<YYYY-MM-DDThh:mm:ssZ>
                {
                    STREAM.Program_Date_Time = line.Substring(line.IndexOf(':') + 1);
                    continue;
                }
                else if (line.Contains("EXT-X-MEDIA"))
                {
                    /*
                     #EXT-X-MEDIA:<attribute-list>
                     * 该属性列表中包含:URI、TYPE、GROUP-ID、LANGUAGE、NAME、DEFAULT、AUTOSELECT。
                     * URI:如果没有,则表示这个 tag 描述的可选择版本在主 PlayList 的 EXT-X-STREAM-INF 中存在
                     * TYPE:AUDIO and VIDEO
                     * GROUP-ID:具有相同 ID 的 MEDIAtag,组成一组样式
                     * LANGUAGE:identifies the primary language used in the rendition
                     * NAME:The value is a quoted-string containing a human-readable description of the rendition. If the LANGUAGE attribute is present then this description SHOULD be in that language
                     * DEFAULT:YES 或是 NO,默认是 No,如果是 YES,则客户端会以这种选项来播放,除非用户自己进行选择
                     * AUTOSELECT:YES 或是 NO,默认是 No,如果是 YES,则客户端会根据当前播放环境来进行选择(用户没有根据自己偏好进行选择的前提下)
                     */
                    STREAM.Media = line.Substring(line.IndexOf(':') + 1);
                    continue;
                }
                else if (line.Contains("EXT-X-DISCONTINUITY"))//当遇到该 tag 的时候说明属性发生了变化
                {
                    STREAM.Discontinuity = line.Substring(line.IndexOf(':') + 1);
                    continue;
                }
                else if (line.Contains("ZEN-TOTAL-DURATION"))//表示这个 m3u8 所含 ts 的总时间长度
                {
                    STREAM.Zen_Total_Duration = line.Substring(line.IndexOf(':') + 1);
                    continue;
                }
            }
            line            = null;
            STREAM.Playlist = Playlist.ToArray();
            STREAM.Parts    = PARTS.ToArray();

            return(STREAM);
        }
        /// <summary>
        /// Parse a HLSStream object from a string
        /// </summary>
        /// <param name="m3u8">The string</param>
        /// <returns>Returns a parsed HLSStream object</returns>
        private static HLSStream ParseFromString(string m3u8)
        {
            string[]             lines    = m3u8.Split(Environment.NewLine.ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
            HLSStream            STREAM   = new HLSStream();
            List <HLSStreamPart> PARTS    = new List <HLSStreamPart>();
            List <HLSPlaylist>   Playlist = new List <HLSPlaylist>();

            string line;

            for (int i = 0; i < lines.Length; i++)
            {
                line = lines[i];

                if (line.Contains("EXTINF"))
                {
                    PARTS.Add(new HLSStreamPart(line, lines[i + 1]));
                    i = i + 1;
                    continue;
                }
                else if (line.Contains("EXT-X-ENDLIST"))
                {
                    break;
                }
                else if (line.Contains("EXTM3U"))
                {
                    continue;
                }
                else if (line.Contains("TARGETDURATION"))
                {
                    STREAM.TargetDuration = line.Split(':')[1];
                    continue;
                }
                else if (line.Contains("ALLOW-CACHE"))
                {
                    STREAM.AllowCache = line.Split(':')[1];
                    continue;
                }
                else if (line.Contains("PLAYLIST-TYPE"))
                {
                    STREAM.PlaylistType = line.Split(':')[1];
                    continue;
                }
                else if (line.Contains("EXT-X-KEY"))
                {
                    STREAM.Key = new HLSEncryptionKey(line.Substring(line.IndexOf(':') + 1));
                    continue;
                }
                else if (line.Contains("VERSION"))
                {
                    STREAM.Version = line.Split(':')[1];
                    continue;
                }
                else if (line.Contains("MEDIA-SEQUENCE"))
                {
                    STREAM.MediaSequence = line.Split(':')[1];
                    continue;
                }
                else if (line.Contains("EXT-X-STREAM-INF"))
                {
                    #region 多码率适配流
                    var tmpPlaylist = new HLSPlaylist();

                    //#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=800000,RESOLUTION=720x406,CODECS="avc1.4d401f,mp4a.40.2"
                    var tmpItems    = line.Split("\"".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
                    var codecsValue = "";
                    var tmpLine     = line;
                    if (tmpItems.Length == 2)
                    {
                        tmpLine     = tmpItems[0];
                        codecsValue = tmpItems[1];
                    }
                    var items = tmpLine.Split("#:,".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
                    for (var si = 1 /*跳过EXT-X-STREAM-INF*/; si < items.Length; si++)
                    {
                        var keyValue = items[si].Split("=".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
                        switch (keyValue[0])
                        {
                        case "BANDWIDTH":
                            tmpPlaylist.BANDWIDTH = keyValue[1];
                            break;

                        case "CODECS":
                            tmpPlaylist.CODECS = codecsValue;    // keyValue[1];
                            break;

                        case "PROGRAM-ID":
                            tmpPlaylist.PROGRAM_ID = keyValue[1];
                            break;

                        case "RESOLUTION":
                            tmpPlaylist.RESOLUTION = keyValue[1];
                            break;
                        }
                    }

                    //
                    tmpPlaylist.URI = lines[i + 1];
                    i = i + 1;

                    Playlist.Add(tmpPlaylist);
                    #endregion
                    continue;
                }
            }
            line            = null;
            STREAM.Playlist = Playlist.ToArray();
            STREAM.Parts    = PARTS.ToArray();

            return(STREAM);
        }