/// <summary> /// Saves the changes made in the current instance to the /// file it represents. /// </summary> public override void Save() { if (udta_box == null) { udta_box = new IsoUserDataBox(); } // Try to get into write mode. Mode = File.AccessMode.Write; try { FileParser parser = new FileParser(this); parser.ParseBoxHeaders(); InvariantStartPosition = parser.MdatStartPosition; InvariantEndPosition = parser.MdatEndPosition; long size_change = 0; long write_position = 0; ByteVector tag_data = udta_box.Render(); // If we don't have a "udta" box to overwrite... if (parser.UdtaTree == null || parser.UdtaTree.Length == 0 || parser.UdtaTree [parser.UdtaTree.Length - 1 ].BoxType != BoxType.Udta) { // Stick the box at the end of the moov box. BoxHeader moov_header = parser.MoovTree [ parser.MoovTree.Length - 1]; size_change = tag_data.Count; write_position = moov_header.Position + moov_header.TotalBoxSize; Insert(tag_data, write_position, 0); // Overwrite the parent box sizes. for (int i = parser.MoovTree.Length - 1; i >= 0; i--) { size_change = parser.MoovTree [i ].Overwrite(this, size_change); } } else { // Overwrite the old box. BoxHeader udta_header = parser.UdtaTree [ parser.UdtaTree.Length - 1]; size_change = tag_data.Count - udta_header.TotalBoxSize; write_position = udta_header.Position; Insert(tag_data, write_position, udta_header.TotalBoxSize); // Overwrite the parent box sizes. for (int i = parser.UdtaTree.Length - 2; i >= 0; i--) { size_change = parser.UdtaTree [i ].Overwrite(this, size_change); } } // If we've had a size change, we may need to adjust // chunk offsets. if (size_change != 0) { // We may have moved the offset boxes, so we // need to reread. parser.ParseChunkOffsets(); InvariantStartPosition = parser.MdatStartPosition; InvariantEndPosition = parser.MdatEndPosition; foreach (Box box in parser.ChunkOffsetBoxes) { IsoChunkLargeOffsetBox co64 = box as IsoChunkLargeOffsetBox; if (co64 != null) { co64.Overwrite(this, size_change, write_position); continue; } IsoChunkOffsetBox stco = box as IsoChunkOffsetBox; if (stco != null) { stco.Overwrite(this, size_change, write_position); continue; } } } TagTypesOnDisk = TagTypes; } finally { Mode = File.AccessMode.Closed; } }
/// <summary> /// Saves the changes made in the current instance to the /// file it represents. /// </summary> public override void Save() { if (udta_boxes.Count == 0) { IsoUserDataBox udtaBox = new IsoUserDataBox(); udta_boxes.Add(udtaBox); } // Try to get into write mode. Mode = File.AccessMode.Write; try { FileParser parser = new FileParser(this); parser.ParseBoxHeaders(); InvariantStartPosition = parser.MdatStartPosition; InvariantEndPosition = parser.MdatEndPosition; long size_change = 0; long write_position = 0; // To avoid rewriting udta blocks which might not have been modified, // the code here will work correctly if: // 1. There is a single udta for the entire file // - OR - // 2. There are multiple utdtas, but only 1 of them contains the Apple ILST box. // We should be OK in the vast majority of cases IsoUserDataBox udtaBox = FindAppleTagUdta(); if (null == udtaBox) { udtaBox = new IsoUserDataBox(); } ByteVector tag_data = udtaBox.Render(); // If we don't have a "udta" box to overwrite... if (udtaBox.ParentTree == null || udtaBox.ParentTree.Length == 0) { // Stick the box at the end of the moov box. BoxHeader moov_header = parser.MoovTree [ parser.MoovTree.Length - 1]; size_change = tag_data.Count; write_position = moov_header.Position + moov_header.TotalBoxSize; Insert(tag_data, write_position, 0); // Overwrite the parent box sizes. for (int i = parser.MoovTree.Length - 1; i >= 0; i--) { size_change = parser.MoovTree [i ].Overwrite(this, size_change); } } else { // Overwrite the old box. BoxHeader udta_header = udtaBox.ParentTree[udtaBox.ParentTree.Length - 1]; size_change = tag_data.Count - udta_header.TotalBoxSize; write_position = udta_header.Position; Insert(tag_data, write_position, udta_header.TotalBoxSize); // Overwrite the parent box sizes. for (int i = udtaBox.ParentTree.Length - 2; i >= 0; i--) { size_change = udtaBox.ParentTree [i ].Overwrite(this, size_change); } } // If we've had a size change, we may need to adjust // chunk offsets. if (size_change != 0) { // We may have moved the offset boxes, so we // need to reread. parser.ParseChunkOffsets(); InvariantStartPosition = parser.MdatStartPosition; InvariantEndPosition = parser.MdatEndPosition; foreach (Box box in parser.ChunkOffsetBoxes) { IsoChunkLargeOffsetBox co64 = box as IsoChunkLargeOffsetBox; if (co64 != null) { co64.Overwrite(this, size_change, write_position); continue; } IsoChunkOffsetBox stco = box as IsoChunkOffsetBox; if (stco != null) { stco.Overwrite(this, size_change, write_position); continue; } } } TagTypesOnDisk = TagTypes; } finally { Mode = File.AccessMode.Closed; } }
public override void Save() { if (udta_boxes.Count == 0) { IsoUserDataBox udtaBox = new IsoUserDataBox(); udta_boxes.Add(udtaBox); } Mode = File.AccessMode.Write; try { FileParser parser = new FileParser(this); parser.ParseBoxHeaders(); InvariantStartPosition = parser.MdatStartPosition; InvariantEndPosition = parser.MdatEndPosition; long size_change = 0; long write_position = 0; IsoUserDataBox udtaBox = FindAppleTagUdta(); if (null == udtaBox) { udtaBox = new IsoUserDataBox(); } ByteVector tag_data = udtaBox.Render(); if (udtaBox.ParentTree == null || udtaBox.ParentTree.Length == 0) { BoxHeader moov_header = parser.MoovTree[parser.MoovTree.Length - 1]; size_change = tag_data.Count; write_position = moov_header.Position + moov_header.TotalBoxSize; Insert(tag_data, write_position, 0); for (int i = parser.MoovTree.Length - 1; i >= 0; i--) { size_change = parser.MoovTree[i].Overwrite(this, size_change); } } else { BoxHeader udta_header = udtaBox.ParentTree[udtaBox.ParentTree.Length - 1]; size_change = tag_data.Count - udta_header.TotalBoxSize; write_position = udta_header.Position; Insert(tag_data, write_position, udta_header.TotalBoxSize); for (int i = udtaBox.ParentTree.Length - 2; i >= 0; i--) { size_change = udtaBox.ParentTree[i].Overwrite(this, size_change); } } if (size_change != 0) { parser.ParseChunkOffsets(); InvariantStartPosition = parser.MdatStartPosition; InvariantEndPosition = parser.MdatEndPosition; foreach (Box box in parser.ChunkOffsetBoxes) { IsoChunkLargeOffsetBox co64 = box as IsoChunkLargeOffsetBox; if (co64 != null) { co64.Overwrite(this, size_change, write_position); continue; } IsoChunkOffsetBox stco = box as IsoChunkOffsetBox; if (stco != null) { stco.Overwrite(this, size_change, write_position); continue; } } } TagTypesOnDisk = TagTypes; } finally { Mode = File.AccessMode.Closed; } }