/// <summary> /// Parses boxes for a specified range, looking for tags and /// properties. /// </summary> /// <param name="start"> /// A <see cref="long" /> value specifying the seek position /// at which to start reading. /// </param> /// <param name="end"> /// A <see cref="long" /> value specifying the seek position /// at which to stop reading. /// </param> /// <param name="handler"> /// A <see cref="IsoHandlerBox" /> object that applied to the /// range being searched. /// </param> private void ParseTagAndProperties (long start, long end, IsoHandlerBox handler) { BoxHeader header; for (long position = start; position < end; position += header.TotalBoxSize) { header = new BoxHeader (file, position); ByteVector type = header.BoxType; if (type == BoxType.Moov || type == BoxType.Mdia || type == BoxType.Minf || type == BoxType.Stbl || type == BoxType.Trak) { ParseTagAndProperties ( header.HeaderSize + position, header.TotalBoxSize + position, handler); } else if (type == BoxType.Stsd) { stsd_boxes.Add (BoxFactory.CreateBox ( file, header, handler)); } else if (type == BoxType.Hdlr) { handler = BoxFactory.CreateBox (file, header, handler) as IsoHandlerBox; } else if (mvhd_box == null && type == BoxType.Mvhd) { mvhd_box = BoxFactory.CreateBox (file, header, handler) as IsoMovieHeaderBox; } else if (udta_box == null && type == BoxType.Udta) { udta_box = BoxFactory.CreateBox (file, header, handler) as IsoUserDataBox; } else if (type == BoxType.Mdat) { mdat_start = position; mdat_end = position + header.TotalBoxSize; } if (header.TotalBoxSize == 0) break; } }
/// <summary> /// Resets all internal fields. /// </summary> private void ResetFields () { mvhd_box = null; udta_box = null; moov_tree = null; udta_tree = null; stco_boxes.Clear (); stsd_boxes.Clear (); mdat_start = -1; mdat_end = -1; }
/// <summary> /// Reads the file with a specified read style. /// </summary> /// <param name="propertiesStyle"> /// A <see cref="ReadStyle" /> value specifying at what level /// of accuracy to read the media properties, or <see /// cref="ReadStyle.None" /> to ignore the properties. /// </param> private void Read(ReadStyle propertiesStyle) { // TODO: Support Id3v2 boxes!!! tag = new CombinedTag(); Mode = AccessMode.Read; try { FileParser parser = new FileParser(this); if (propertiesStyle == ReadStyle.None) { parser.ParseTag(); } else { parser.ParseTagAndProperties(); } InvariantStartPosition = parser.MdatStartPosition; InvariantEndPosition = parser.MdatEndPosition; udta_box = parser.UserDataBox; if (udta_box != null && udta_box.GetChild(BoxType.Meta) != null && udta_box.GetChild(BoxType.Meta ).GetChild(BoxType.Ilst) != null) { TagTypesOnDisk |= TagTypes.Apple; } if (udta_box == null) { udta_box = new IsoUserDataBox(); } apple_tag = new AppleTag(udta_box); tag.SetTags(apple_tag); // If we're not reading properties, we're done. if (propertiesStyle == ReadStyle.None) { Mode = AccessMode.Closed; return; } // Get the movie header box. IsoMovieHeaderBox mvhd_box = parser.MovieHeaderBox; if (mvhd_box == null) { Mode = AccessMode.Closed; throw new CorruptFileException( "mvhd box not found."); } IsoAudioSampleEntry audio_sample_entry = parser.AudioSampleEntry; IsoVisualSampleEntry visual_sample_entry = parser.VisualSampleEntry; // Read the properties. properties = new Properties(mvhd_box.Duration, audio_sample_entry, visual_sample_entry); } finally { Mode = AccessMode.Closed; } }