void id3::v2::render(ID3_Writer& writer, const ID3_TagImpl& tag)
{
// There has to be at least one frame for there to be a tag...
if (tag.NumFrames() == 0)
{
ID3D_WARNING( "id3::v2::render(): no frames to render" );
return;
}
ID3D_NOTICE( "id3::v2::render(): rendering" );
ID3_TagHeader hdr;
hdr.SetSpec(tag.GetSpec());
hdr.SetExtended(tag.GetExtended());
hdr.SetExperimental(tag.GetExperimental());
// set up the encryption and grouping IDs
// ...
String frms;
io::StringWriter frmWriter(frms);
if (!tag.GetUnsync())
{
ID3D_NOTICE( "id3::v2::render(): rendering frames" );
renderFrames(frmWriter, tag);
hdr.SetUnsync(false);
}
else
{
ID3D_NOTICE( "id3::v2::render(): rendering unsynced frames" );
io::UnsyncedWriter uw(frmWriter);
renderFrames(uw, tag);
uw.flush();
ID3D_NOTICE( "id3::v2::render(): numsyncs = " << uw.getNumSyncs() );
hdr.SetUnsync(uw.getNumSyncs() > 0);
}
size_t frmSize = frms.size();
if (frmSize == 0)
{
ID3D_WARNING( "id3::v2::render(): rendered frame size is 0 bytes" );
return;
}
// zero the remainder of the buffer so that our padding bytes are zero
luint nPadding = tag.PaddingSize(frmSize);
ID3D_NOTICE( "id3::v2::render(): padding size = " << nPadding );
hdr.SetDataSize(frmSize + nPadding);
hdr.Render(writer);
writer.writeChars(frms.data(), frms.size());
for (size_t i = 0; i < nPadding; ++i)
{
if (writer.writeChar('\0') == ID3_Writer::END_OF_WRITER)
{
break;
}
}
}
size_t ID3_TagImpl::Size() const
{
if (this->NumFrames() == 0)
{
return 0;
}
ID3_TagHeader hdr;
hdr.SetSpec(this->GetSpec());
size_t bytesUsed = hdr.Size();
size_t frameBytes = 0;
for (const_iterator cur = _frames.begin(); cur != _frames.end(); ++cur)
{
if (*cur)
{
(*cur)->SetSpec(this->GetSpec());
frameBytes += (*cur)->Size();
}
}
if (!frameBytes)
{
return 0;
}
bytesUsed += frameBytes;
// add 30% for sync
if (this->GetUnsync())
{
bytesUsed += bytesUsed / 3;
}
bytesUsed += this->PaddingSize(bytesUsed);
return bytesUsed;
}