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Added documentation for the header editor.

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Moritz Bunkus 2009-03-22 00:09:11 +01:00
parent 7fd8717588
commit 0003a1b523
6 changed files with 169 additions and 1 deletions
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4
ChangeLog
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@ -1,3 +1,7 @@
2009-03-22 Moritz Bunkus <moritz@bunkus.org>
* mmg: new feature: Added a header editor for Matroska files.
2009-03-21 Moritz Bunkus <moritz@bunkus.org>
* mkvextract: bug fix: The "simple" chapter extraction mode (OGM

7
doc/mkvmerge-gui.hhc
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@ -34,4 +34,11 @@
<param name="Local" value="mkvmerge-gui.html#wxhh_chaptereditor">
</object>
</li>
<li>
<object type="text/sitemap">
<param name="Name" value="The header editor">
<param name="ID" value=50000>
<param name="Local" value="mkvmerge-gui.html#wxhh_headereditor">
</object>
</li>
</ul>

140
doc/mkvmerge-gui.html
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@ -143,6 +143,28 @@
</li>
</ol>
</li>
<li>
<a href="mkvmerge-gui.html#headereditor">The header editor</a>
<br>
<ol>
<li>
<a href="mkvmerge-gui.html#he_addingremovingheaderfields">Adding
and removing header fields</a>
</li>
<li>
<a href="mkvmerge-gui.html#he_analyzingthefile">Opening an existing file</a>
</li>
<li>
<a href="mkvmerge-gui.html#he_analyzingthefile">Opening an existing file</a>
</li>
<li>
<a href="mkvmerge-gui.html#he_validation">Validation</a>
</li>
<li>
<a href="mkvmerge-gui.html#he_saving">Saving the file</a>
</li>
</ol>
</li>
</ol>
</p>
@ -1010,5 +1032,123 @@
menu. <i>mmg</i> will automatically detect the file type used and read the
chapters.</p>
<a name="wxhh_headereditor"></a>
<h2><a name="headereditor">5. The header editor</a></h2>
<p>
mmg features an editor for header fields of existing Matroska
files. It can be started from mmg's &quot;File&quot; menu by
chosing the &quot;Header editor&quot;.
</p>
<p>
The header editor allows the user to edit certain fields of the
segment information headers and of the headers of each track
without having to remux the whole file. Its usage is simple: load a
file, select the header fields you want to change, change its
value, and save the file.
</p>
<h3><a name="he_addingremovingheaderfields">5.1. Adding and removing header fields</a></h3>
<p>
The Matroska file format allows for most header fields to be
present or absent. mmg's header editor will show inputs for all
header fields it supports even if they're currently not present in
the file. It allows the user to add fields that are currently not
present to the file and to remove currently present fields from the
file.
</p>
<h3><a name="he_analyzingthefile">5.2. Opening an existing file</a></h3>
<p>
The user can start editing a file by chosing &quot;Open&quot; from
the &quot;File&quot; menu. After selecting the appropriate file the
header editor will scan the file for all important elements. This
can take some time depending on the file's size. This is neccessary
due to Matroska's flexible file structure.
</p>
<h3><a name="he_analyzingthefile">5.3. Editing header fields</a></h3>
<p>
After opening the file the left pane will show one element for the
segment headers and one element for each track that is found in the
file. Each node in the tree contains a number of sub-elements which
represent the actual header values. When the user selects such a
sub-element the right pane is updated to show a number of facts
about the element:
</p>
<p>
<ul>
<li>its type (a number, a string etc),</li>
<li>its name,</li>
<li>a short description of its contents,</li>
<li>whether or not the element is currently present in the file
including an option to remove it if it is or to to add it if it
isn't,</li>
<li>the element's original value if it was present when the file
was opened and</li>
<li>a control to modify its content.</li>
</ul>
</p>
<p>
Most value types are self-explanatory: numbers, strings etc. The
binary type however is shown as a sequence of hex digits. The
accepted formats are the same as mkvmerge's various options for
specifying segment UIDs: either a simple sequence of hex digits
(e.g. 1857a7fe7d...) or the hex numbers prefixed with
&quot;0x&quot; before each pair (e.g. 0x18 0x57 0xa7 0xfe 0x7d...).
</p>
<h3><a name="he_validation">5.4. Validation</a></h3>
<p>
The user can validate your changes by chosing &quot;Validate&quot;
from the &quot;Headers&quot; menu. Validation is also run
automatically each time the user wants to save the
files. Validation makes sure that the values the user supplied can
be stored in the element in question. For example a number element
must not contain characters.
</p>
<p>
If validation fails then the first element failing validation is
selected so that the user can correct the mistake.
</p>
<h3><a name="he_saving">5.5. Saving the file</a></h3>
<p>
The user can save the changes by selecting &quot;Save&quot; from
the &quot;File&quot; menu. If no changes have been made then mmg
will say so and not modify the file.
</p>
<p>
Before modifying the file mmg check if the file has been modified
by another application since it has been opened. If this is the
case then mmg warns the user, discards all changes and reloads the
file in order to ensure that the file will not be corrupted.
</p>
<p>
mmg tries very hard to find suitable spots for writing the modified
headers. It will overwrite existing header elements at their
original position, EbmlVoid elements and all other instances of the
headers it finds. It will also update the meta seek heads so that
the headers can be found easily by applications reading that file.
</p>
<p>
After saving the file the header editor will automatically reload
and analyze it again. This is done to ensure that no file
corruoption occurs. As it slows down the process of saving the file
considerably this safety feature will be removed in a future
release of mmg after enough testing has been done.
</p>
</body>
</html>

2
src/mmg/header_editor_frame.cpp
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@ -36,6 +36,7 @@
#include "he_top_level_page.h"
#include "he_unsigned_integer_value_page.h"
#include "mmg.h"
#include "mmg_dialog.h"
#include "wxcommon.h"
header_editor_frame_c::header_editor_frame_c(wxWindow *parent)
@ -561,6 +562,7 @@ header_editor_frame_c::validate() {
void
header_editor_frame_c::on_help_help(wxCommandEvent &evt) {
mdlg->display_help(HELP_ID_HEADER_EDITOR);
}
bool

8
src/mmg/mmg.cpp
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@ -1086,6 +1086,11 @@ mmg_dialog::muxing_has_finished() {
void
mmg_dialog::on_help(wxCommandEvent &evt) {
display_help(notebook->GetCurrentPage() == chapter_editor_page ? HELP_ID_CHAPTER_EDITOR : HELP_ID_CONTENTS);
}
void
mmg_dialog::display_help(int id) {
if (help == NULL) {
wxDirDialog dlg(this, Z("Choose the location of the mkvmerge GUI help files"));
vector<wxString> potential_help_paths;
@ -1164,7 +1169,8 @@ mmg_dialog::on_help(wxCommandEvent &evt) {
help = new wxHtmlHelpController;
help->AddBook(wxFileName(help_path + wxT("/mkvmerge-gui.hhp")), false);
}
help->Display(1);
help->Display(id);
}
void

9
src/mmg/mmg_dialog.h
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@ -68,6 +68,13 @@
#define ID_M_HELP_ABOUT 65000
#define ID_M_HELP_HELP 65001
#define HELP_ID_CONTENTS 1
#define HELP_ID_INTRODUCTION 10000
#define HELP_ID_SETUP 20000
#define HELP_ID_MUXING 30000
#define HELP_ID_CHAPTER_EDITOR 40000
#define HELP_ID_HEADER_EDITOR 50000
/* class tab_advanced; */
class tab_attachments;
class tab_chapters;
@ -189,6 +196,8 @@ public:
void remember_previous_output_directory();
void query_mkvmerge_capabilities();
void display_help(int id);
};
extern mmg_dialog *mdlg;