protected override bool read(BinaryReader source, MetaDataIO.ReadTagParams readTagParams)
{
bool result = false;
long position;
resetData();
source.BaseStream.Seek(0, SeekOrigin.Begin);
if (AIFF_CONTAINER_ID.Equals(Utils.Latin1Encoding.GetString(source.ReadBytes(4))))
{
// Container chunk size
long containerChunkPos = source.BaseStream.Position;
int containerChunkSize = StreamUtils.DecodeBEInt32(source.ReadBytes(4));
if (containerChunkPos + containerChunkSize + 4 != source.BaseStream.Length)
{
LogDelegator.GetLogDelegate()(Log.LV_WARNING, "Header size is incoherent with file size");
}
// Form type
format = Utils.Latin1Encoding.GetString(source.ReadBytes(4));
if (format.Equals(FORMTYPE_AIFF) || format.Equals(FORMTYPE_AIFC))
{
isValid = true;
StringBuilder commentStr = new StringBuilder("");
long soundChunkPosition = 0;
long soundChunkSize = 0; // Header size included
bool nameFound = false;
bool authorFound = false;
bool copyrightFound = false;
bool commentsFound = false;
long limit = Math.Min(containerChunkPos + containerChunkSize + 4, source.BaseStream.Length);
int annotationIndex = 0;
int commentIndex = 0;
while (source.BaseStream.Position < limit)
{
ChunkHeader header = seekNextChunkHeader(source, limit);
position = source.BaseStream.Position;
if (header.ID.Equals(CHUNKTYPE_COMMON))
{
short channels = StreamUtils.DecodeBEInt16(source.ReadBytes(2));
switch (channels)
{
case 1: channelsArrangement = MONO; break;
case 2: channelsArrangement = STEREO; break;
case 3: channelsArrangement = ISO_3_0_0; break;
case 4: channelsArrangement = ISO_2_2_0; break; // Specs actually allow both 2/2.0 and LRCS
case 6: channelsArrangement = LRLcRcCS; break;
default: channelsArrangement = UNKNOWN; break;
}
numSampleFrames = StreamUtils.DecodeBEUInt32(source.ReadBytes(4));
sampleSize = (uint)StreamUtils.DecodeBEInt16(source.ReadBytes(2)); // This sample size is for uncompressed data only
byte[] byteArray = source.ReadBytes(10);
Array.Reverse(byteArray);
double aSampleRate = StreamUtils.ExtendedToDouble(byteArray);
if (format.Equals(FORMTYPE_AIFC))
{
compression = Utils.Latin1Encoding.GetString(source.ReadBytes(4));
}
else // AIFF <=> no compression
{
compression = COMPRESSION_NONE;
}
if (aSampleRate > 0)
{
sampleRate = (int)Math.Round(aSampleRate);
duration = (double)numSampleFrames * 1000.0 / sampleRate;
if (!compression.Equals(COMPRESSION_NONE)) // Sample size is specific to selected compression method
{
if (compression.ToLower().Equals("fl32"))
{
sampleSize = 32;
}
else if (compression.ToLower().Equals("fl64"))
{
sampleSize = 64;
}
else if (compression.ToLower().Equals("alaw"))
{
sampleSize = 8;
}
else if (compression.ToLower().Equals("ulaw"))
{
sampleSize = 8;
}
}
if (duration > 0)
{
bitrate = sampleSize * numSampleFrames * channelsArrangement.NbChannels / duration;
}
}
}
else if (header.ID.Equals(CHUNKTYPE_SOUND))
{
soundChunkPosition = source.BaseStream.Position - 8;
soundChunkSize = header.Size + 8;
}
else if (header.ID.Equals(CHUNKTYPE_NAME) || header.ID.Equals(CHUNKTYPE_AUTHOR) || header.ID.Equals(CHUNKTYPE_COPYRIGHT))
{
structureHelper.AddZone(source.BaseStream.Position - 8, header.Size + 8, header.ID);
structureHelper.AddSize(containerChunkPos, containerChunkSize, header.ID);
tagExists = true;
if (header.ID.Equals(CHUNKTYPE_NAME))
{
nameFound = true;
}
if (header.ID.Equals(CHUNKTYPE_AUTHOR))
{
authorFound = true;
}
if (header.ID.Equals(CHUNKTYPE_COPYRIGHT))
{
copyrightFound = true;
}
SetMetaField(header.ID, Utils.Latin1Encoding.GetString(source.ReadBytes(header.Size)), readTagParams.ReadAllMetaFrames);
}
else if (header.ID.Equals(CHUNKTYPE_ANNOTATION))
{
annotationIndex++;
structureHelper.AddZone(source.BaseStream.Position - 8, header.Size + 8, header.ID + annotationIndex);
structureHelper.AddSize(containerChunkPos, containerChunkSize, header.ID + annotationIndex);
if (commentStr.Length > 0)
{
commentStr.Append(Settings.InternalValueSeparator);
}
commentStr.Append(Utils.Latin1Encoding.GetString(source.ReadBytes(header.Size)));
tagExists = true;
}
else if (header.ID.Equals(CHUNKTYPE_COMMENTS))
{
commentIndex++;
structureHelper.AddZone(source.BaseStream.Position - 8, header.Size + 8, header.ID + commentIndex);
structureHelper.AddSize(containerChunkPos, containerChunkSize, header.ID + commentIndex);
tagExists = true;
commentsFound = true;
ushort numComs = StreamUtils.DecodeBEUInt16(source.ReadBytes(2));
for (int i = 0; i < numComs; i++)
{
CommentData cmtData = new CommentData();
cmtData.Timestamp = StreamUtils.DecodeBEUInt32(source.ReadBytes(4));
cmtData.MarkerId = StreamUtils.DecodeBEInt16(source.ReadBytes(2));
// Comments length
ushort comLength = StreamUtils.DecodeBEUInt16(source.ReadBytes(2));
MetaFieldInfo comment = new MetaFieldInfo(getImplementedTagType(), header.ID + commentIndex);
comment.Value = Utils.Latin1Encoding.GetString(source.ReadBytes(comLength));
comment.SpecificData = cmtData;
tagData.AdditionalFields.Add(comment);
// Only read general purpose comments, not those linked to a marker
if (0 == cmtData.MarkerId)
{
if (commentStr.Length > 0)
{
commentStr.Append(Settings.InternalValueSeparator);
}
commentStr.Append(comment.Value);
}
}
}
else if (header.ID.Equals(CHUNKTYPE_ID3TAG))
{
id3v2Offset = source.BaseStream.Position;
// Zone is already added by Id3v2.Read
id3v2StructureHelper.AddZone(id3v2Offset - 8, header.Size + 8, CHUNKTYPE_ID3TAG);
id3v2StructureHelper.AddSize(containerChunkPos, containerChunkSize, CHUNKTYPE_ID3TAG);
}
source.BaseStream.Position = position + header.Size;
if (header.ID.Equals(CHUNKTYPE_SOUND) && header.Size % 2 > 0)
{
source.BaseStream.Position += 1; // Sound chunk size must be even
}
}
tagData.IntegrateValue(TagData.TAG_FIELD_COMMENT, commentStr.ToString().Replace("\0", " ").Trim());
if (-1 == id3v2Offset)
{
id3v2Offset = 0; // Switch status to "tried to read, but nothing found"
if (readTagParams.PrepareForWriting)
{
id3v2StructureHelper.AddZone(soundChunkPosition + soundChunkSize, 0, CHUNKTYPE_ID3TAG);
id3v2StructureHelper.AddSize(containerChunkPos, containerChunkSize, CHUNKTYPE_ID3TAG);
}
}
// Add zone placeholders for future tag writing
if (readTagParams.PrepareForWriting)
{
if (!nameFound)
{
structureHelper.AddZone(soundChunkPosition, 0, CHUNKTYPE_NAME);
structureHelper.AddSize(containerChunkPos, containerChunkSize, CHUNKTYPE_NAME);
}
if (!authorFound)
{
structureHelper.AddZone(soundChunkPosition, 0, CHUNKTYPE_AUTHOR);
structureHelper.AddSize(containerChunkPos, containerChunkSize, CHUNKTYPE_AUTHOR);
}
if (!copyrightFound)
{
structureHelper.AddZone(soundChunkPosition, 0, CHUNKTYPE_COPYRIGHT);
structureHelper.AddSize(containerChunkPos, containerChunkSize, CHUNKTYPE_COPYRIGHT);
}
if (!commentsFound)
{
structureHelper.AddZone(soundChunkPosition, 0, CHUNKTYPE_COMMENTS);
structureHelper.AddSize(containerChunkPos, containerChunkSize, CHUNKTYPE_COMMENTS);
}
}
result = true;
}
}
return(result);
}
