| // $Id: tag_render.cpp,v 1.44 2002/07/31 13:20:49 t1mpy Exp $ |
| |
| // id3lib: a C++ library for creating and manipulating id3v1/v2 tags |
| // Copyright 1999, 2000 Scott Thomas Haug |
| // Copyright 2002 Thijmen Klok (thijmen@id3lib.org) |
| |
| // This library is free software; you can redistribute it and/or modify it |
| // under the terms of the GNU Library General Public License as published by |
| // the Free Software Foundation; either version 2 of the License, or (at your |
| // option) any later version. |
| // |
| // This library is distributed in the hope that it will be useful, but WITHOUT |
| // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| // FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public |
| // License for more details. |
| // |
| // You should have received a copy of the GNU Library General Public License |
| // along with this library; if not, write to the Free Software Foundation, |
| // Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| |
| // The id3lib authors encourage improvements and optimisations to be sent to |
| // the id3lib coordinator. Please see the README file for details on where to |
| // send such submissions. See the AUTHORS file for a list of people who have |
| // contributed to id3lib. See the ChangeLog file for a list of changes to |
| // id3lib. These files are distributed with id3lib at |
| // http://download.sourceforge.net/id3lib/ |
| |
| #include <memory.h> |
| #include "tag_impl.h" //has <stdio.h> "tag.h" "header_tag.h" "frame.h" "field.h" "spec.h" "id3lib_strings.h" "utils.h" |
| #include "helpers.h" |
| #include "writers.h" |
| #include "id3/io_decorators.h" //has "readers.h" "io_helpers.h" "utils.h" |
| #include "io_helpers.h" |
| #include "io_strings.h" |
| |
| #if defined HAVE_SYS_PARAM_H |
| #include <sys/param.h> |
| #endif |
| |
| using namespace dami; |
| |
| void id3::v1::render(ID3_Writer& writer, const ID3_TagImpl& tag) |
| { |
| writer.writeChars("TAG", 3); |
| |
| io::writeTrailingSpaces(writer, id3::v2::getTitle(tag), ID3_V1_LEN_TITLE); |
| io::writeTrailingSpaces(writer, id3::v2::getArtist(tag), ID3_V1_LEN_ARTIST); |
| io::writeTrailingSpaces(writer, id3::v2::getAlbum(tag), ID3_V1_LEN_ALBUM); |
| io::writeTrailingSpaces(writer, id3::v2::getYear(tag), ID3_V1_LEN_YEAR); |
| |
| size_t track = id3::v2::getTrackNum(tag); |
| String comment = id3::v2::getV1Comment(tag); |
| if (track > 0) |
| { |
| io::writeTrailingSpaces(writer, comment, ID3_V1_LEN_COMMENT - 2); |
| writer.writeChar('\0'); |
| writer.writeChar((char) track); |
| } |
| else |
| { |
| io::writeTrailingSpaces(writer, comment, ID3_V1_LEN_COMMENT); |
| } |
| writer.writeChar((char) id3::v2::getGenreNum(tag)); |
| } |
| |
| namespace |
| { |
| void renderFrames(ID3_Writer& writer, const ID3_TagImpl& tag) |
| { |
| for (ID3_TagImpl::const_iterator iter = tag.begin(); iter != tag.end(); ++iter) |
| { |
| const ID3_Frame* frame = *iter; |
| if (frame) frame->Render(writer); |
| } |
| } |
| } |
| |
| 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()); |
| hdr.SetFooter(tag.GetFooter()); |
| |
| // 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 + tag.GetExtendedBytes() + 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; |
| } |
| |
| |
| void ID3_TagImpl::RenderExtHeader(uchar *buffer) |
| { |
| if (this->GetSpec() == ID3V2_3_0) |
| { |
| } |
| |
| return ; |
| } |
| |
| |
| #define ID3_PADMULTIPLE (2048) |
| #define ID3_PADMAX (4096) |
| |
| |
| size_t ID3_TagImpl::PaddingSize(size_t curSize) const |
| { |
| luint newSize = 0; |
| |
| // if padding is switched off |
| if (! _is_padded) |
| { |
| return 0; |
| } |
| |
| // if the old tag was large enough to hold the new tag, then we will simply |
| // pad out the difference - that way the new tag can be written without |
| // shuffling the rest of the song file around |
| if ((this->GetPrependedBytes()-ID3_TagHeader::SIZE > 0) && |
| (this->GetPrependedBytes()-ID3_TagHeader::SIZE >= curSize) && |
| (this->GetPrependedBytes()-ID3_TagHeader::SIZE - curSize) < ID3_PADMAX) |
| { |
| newSize = this->GetPrependedBytes()-ID3_TagHeader::SIZE; |
| } |
| else |
| { |
| luint tempSize = curSize + ID3_GetDataSize(*this) + |
| this->GetAppendedBytes() + ID3_TagHeader::SIZE; |
| |
| // this method of automatic padding rounds the COMPLETE FILE up to the |
| // nearest 2K. If the file will already be an even multiple of 2K (with |
| // the tag included) then we just add another 2K of padding |
| tempSize = ((tempSize / ID3_PADMULTIPLE) + 1) * ID3_PADMULTIPLE; |
| |
| // the size of the new tag is the new filesize minus the audio data |
| newSize = tempSize - ID3_GetDataSize(*this) - this->GetAppendedBytes () - |
| ID3_TagHeader::SIZE; |
| } |
| |
| return newSize - curSize; |
| } |
| |