/// <summary>
/// Read MP4 structure recursively and make a list of meta data.
/// </summary>
private void ReadRecurse(long length)
{
long p = 0;
while (true)
{
// read ATOM header
byte[] buffer = new byte[NODE_LIST_HEADER_SIZE];
strm.Read(buffer, 0, NODE_LIST_HEADER_SIZE);
long atom_size = BEUInt32(buffer, 0);
UInt32 atom_name = BEUInt32(buffer, 4);
var headerSize = NODE_LIST_HEADER_SIZE;
if (atom_size == 1)
{
byte[] large_size_buf = new byte[sizeof(UInt64)];
strm.Read(large_size_buf, 0, sizeof(UInt64));
var large_size = BEUInt64(large_size_buf, 0);
atom_size = (long)large_size;
headerSize = NODE_LIST_HEADER_SIZE + sizeof(UInt64);
}
else if (atom_size == 0)
{
throw new System.IO.FileFormatException("atom_size is zero");
}
atom_size -= headerSize;
if ((atom_size > (length - p)) || (atom_size < 0))
{
return;
}
long initial_pos = strm.Position;
switch (atom_name)
{
case 0x6D646174: // mdat
// メタ情報が取得済みと思われる場合、mdatが見つかった時点で処理終了
if (tags.Count != 0)
{
throw new EndOfStreamException();
}
break;
case 0x64617461: // data
if (tagValue == null)
{
ReadData((int)atom_size);
}
break;
case 0x6E616D65: // name
tagKey = ReadName((int)atom_size).ToUpper();
break;
case 0x676E7265: // gnre
tagValue = null;
try
{
ReadRecurse(atom_size);
if (tagValue == null)
{
break;
}
if (!(tagValue is int))
{
break;
}
var genreStr = ID3.GetGenreString((int)tagValue - 1);
if (genreStr == null)
{
break;
}
tags.Add(new KeyValuePair <string, object>("GENRE", genreStr));
}
catch (ArgumentException) { }
catch (IOException) { }
catch (FormatException) { }
break;
case 0x6D703461: // mp4a
ReadMp4a((int)atom_size);
break;
case 0x616C6163: // alac
ReadAlac((int)atom_size);
break;
case 0x6D766864: // mvhd
ReadMvhd((int)atom_size);
break;
case 0x2D2D2D2D: // ----
Read____((int)atom_size);
break;
case 0x70696E66: // pinf
tags.Add(new KeyValuePair <string, object>("PURCHASED", "true"));
break;
default:
if (KnownListAtoms.ContainsKey(atom_name))
{
var offset = KnownListAtoms[atom_name];
if (offset != 0)
{
strm.Seek(offset, SeekOrigin.Current);
}
ReadRecurse(atom_size - offset);
}
else if (KnownItunesTagAtoms.ContainsKey(atom_name))
{
tagValue = null;
ReadRecurse(atom_size);
if ((tagValue != null) || (tagValuePicture != null))
{
AddToTag(KnownItunesTagAtoms[atom_name]);
}
}
else
{
strm.Seek(atom_size, SeekOrigin.Current);
}
break;
}
p += atom_size + headerSize;
initial_pos += atom_size;
if (p >= length)
{
return;
}
if (strm.Position != initial_pos)
{
strm.Seek(initial_pos, SeekOrigin.Begin);
}
}
}
public static List <KeyValuePair <string, object> > readTagByFilename(string filename, bool createImageObject)
{
List <KeyValuePair <string, object> > tag = null;
try
{
using (System.IO.FileStream fs = System.IO.File.Open(filename, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read))
{
switch (System.IO.Path.GetExtension(filename).ToLower())
{
case ".flac":
tag = FlacTag.Read(fs, createImageObject);
break;
case ".ogg":
tag = Ogg.Read(fs);
break;
case ".m4a":
case ".m4v":
case ".mp4":
case ".aac":
tag = MP4.Read(fs, createImageObject);
break;
case ".wma":
case ".asf":
case ".wmv":
tag = ASF.Read(fs, createImageObject);
break;
case ".ape":
case ".tak":
case ".wv":
tag = ApeTag.Read(fs, createImageObject);
break;
case ".tta":
case ".mp3":
case ".mp2":
try
{
tag = ApeTag.Read(fs, createImageObject);
if (tag == null)
{
tag = new List <KeyValuePair <string, object> >();
}
}
catch (IOException) { }
try
{
fs.Seek(0, System.IO.SeekOrigin.Begin);
var tag_id3v2 = ID3ToTag(ID3V2Tag.readID3tag(fs, createImageObject));
if (tag_id3v2 != null)
{
tag.AddRange(tag_id3v2);
}
}
catch (IOException ex) { Logger.Error(ex); }
try
{
fs.Seek(0, System.IO.SeekOrigin.Begin);
var tag_id3v1 = ID3.Read(fs);
if (tag_id3v1 != null)
{
foreach (var v1tag in tag_id3v1)
{
if (tag.Find((e) => e.Key == v1tag.Key).Key == null)
{
tag.Add(v1tag);
}
}
}
}
catch (IOException) { }
break;
default:
return(null);
}
}
}
catch (IOException) { }
if (tag == null)
{
return(null);
}
// BANDをALBUM ARTISTとして扱う
var band = tag.Find((e) => { return(e.Key == "BAND"); });
if (band.Value != null)
{
tag.Add(new KeyValuePair <string, object>("ALBUM ARTIST", band.Value));
}
// TRACKNUMBERをTRACKとして扱う
var tracknumber = tag.Find((e) => { return(e.Key == "TRACKNUMBER"); });
if (tracknumber.Value != null)
{
tag.Add(new KeyValuePair <string, object>("TRACK", tracknumber.Value));
}
// ARTISTがないとき、ALBUM ARTISTをARTISTとして扱う
if (tag.Find((e) => { return(e.Key == "ARTIST"); }).Value == null)
{
var albumartist = tag.Find((e) => { return(e.Key == "ALBUM ARTIST"); });
if (albumartist.Value != null)
{
tag.Add(new KeyValuePair <string, object>("ARTIST", albumartist.Value));
}
}
return(tag);
}
/// <summary>
/// ID3V2フレームのデータを読む
/// </summary>
/// <param name="sr"></param>
/// <param name="fr"></param>
/// <param name="createImageObject"></param>
private static void readFrameBody(Stream sr, Frame fr, bool createImageObject)
{
if (fr.ID.Type == FRAME_TYPE.FR_APIC)
{
if (!createImageObject)
{
sr.Seek(sr.Length, SeekOrigin.Current);
return;
}
var tmp = sr.ReadBytes((int)sr.Length);
int offset = 0;
string imgtype = Encoding.ASCII.GetString(tmp, 1, 3);
if ((imgtype == "JPG") || (imgtype == "PNG"))
{
fr.Picture_type = tmp[4];
offset = tmp.IndexOf(5, 0) + 1;
}
else // mime
{
int pictureTypeIndex = tmp.IndexOf(1, 0) + 1;
fr.Picture_type = tmp[pictureTypeIndex];
offset = tmp.IndexOf(pictureTypeIndex + 1, 0) + 1;
}
MemoryStream ms = new MemoryStream(tmp, offset, tmp.Length - offset);
try
{
fr.Image = System.Drawing.Image.FromStream(ms);
}
catch (ArgumentException) { }
}
else
{
var tmp = sr.ReadBytes((int)sr.Length);
Encoding enc = ID32Encodings[0]; // default
int offset = 0;
if (tmp[0] < ID32Encodings.Length)
{
offset += 1;
if (fr.ID.Type == FRAME_TYPE.FR_TXT_EX_LNG)
{
offset += 3;
}
enc = ID32Encodings[tmp[0]];
}
fr.Value = enc.GetString(tmp, offset, tmp.Length - offset).Replace("\ufeff", "").Trim().TrimEnd(new char[] { '\0' });
//genreのとき
if (fr.ID.Name4 == "TCON")
{
var match = GenreRegex.Match(fr.Value);
if (match.Success)
{
fr.Value = ID3.GetGenreString(int.Parse(match.Groups[1].Value)) ?? match.Groups[2].Value;
}
}
// TXXX,COMMなどのとき
if (fr.ID.Type == FRAME_TYPE.FR_TXT_EX || fr.ID.Type == FRAME_TYPE.FR_TXT_EX_LNG)
{
int idx = fr.Value.IndexOf('\0');
if (idx == -1)
{
fr.Extid = "";
fr.Value = "";
}
else
{
fr.Extid = fr.Value.Substring(0, idx).ToUpper();
fr.Value = fr.Value.Substring(idx + 1).TrimEnd(new char[] { '\0' });
}
}
}
}
