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资源说明：A curses media indexer and player for vi users
vitunes
=======
A no-fluff media player & indexer, for vi users.
See http://vitunes.org for more information about vitunes.
The rest of this README is for developers interested in hacking vitunes.
### Building & Installing
$ ./configure // build config.mk
$ make // build vitunes
$ make install // install binary & man pages
$ make test // run unit tests (sparse for now)
### Utilities
* [doxygen](https://rawgit.com/ryanflannery/vitunes/master/doc/doxygen/html/index.html)
Update with `make doxygen`.
Raw for right now. Buidling this out.
* [cppcheck results](https://rawgit.com/ryanflannery/vitunes/master/doc/cppcheck/results.txt)
Update with `make cppcheck`
* [flawfinder results](https://rawgit.com/ryanflannery/vitunes/master/doc/flawfinder/results.txt)
Update with `make flawfinder`
* [scan-build](https://rawgit.com/ryanflannery/vitunes/master/doc/scan-build/index.html)
Update with `make scan-build` and move results into scan-build directory
Introduction
------------
For the hacking sort, this document may help navigate the source code to
vitunes. ...and myself, 18 months from now when I dive back into vitunes.
For list of current todo's, known bug's, or other stuff to work on, grep the
source for `TODO`s and `FIXME`s. Note that `XXX` is used only for important
notes. For longer stuff (big, long-term to-do's), there's an up-to-date list
at the bottom of this file.
Below you'll find 3 sections.
1. Media-Library Structure: a quick overview of how the media is handled
2. Code-Structure: Notable Globals. Listing of the 3 key global structs
3. Code-Structure: The Modules. Overview of each of the 9 modules.
Care has also been taken to make all .h files briefly document the API
therein. This should be maintained.
This should be enough for most to jump-into hacking on vitunes.
For debugging (which can be painful in a curses application), see `debug.h`
and what happens when you `make -DDEBUG`. Two macros are created, one to
log to a file (`DFLOG`) and one to log to the console (`DCLOG`). The log
file (`vitunes-debug.log`) is opened in `vitunes.c` if `-DDEBUG`.
Media Library Structure
-----------------------
Before hacking on vitunes, it's important to understand the following about
the overall structure.
* vitunes works by maintaining a database of all known files in
`~/.vitunes/vitunes.db`
* The database is initialized, updated, and stuff added to it via, commands
like
$ vitunes -e init
$ vitunes -e update
$ vitunes -e add ~/music /path/to/more/music ...
$ vitunes -e addurl "http://...."
See `vitunes -e help` for more details.
* If a media file is not in the database, vitunes cannot play it.
* Once the database is setup, vitunes can be run normally as `vitunes`
* Once vitunes is run normally, one can browse the library, filter,
sort, search, copy/paste/delete/etc and create new playlists. All
playlists are stored in `~/.vitunes/playlists/`
by default.
* The playlist files themselves contain nothing more than the absolute
paths (via `realpath(3)`) to the media files contained in the database.
There is no meta information in playlists. All meta information is
in the database.
* media playback is done with either
1. a `fork()`'d instance of `mplayer` [2], or
2. `gstreamer`
* extracting meta-information from media files is done with the TagLib
library [1], used in `mi_extract()` (`meta_info.*`) for extraction, and
in `ecmd_tag()` (`vitunes.c`) for tagging.
Code Structure: Notable Globals
-------------------------------
vitunes maintains a few key global objects (structs) that are used
throughout much of the code. They are:
mdb Maintains all information about the media library,
including the database (an array of `meta_info*`s), all
playlists, and the filter results.
See `medialib.h` for more info.
player Maintains all information about the `fork()`'d child
process of that handles playback, including pipes to
read/write to the process, the currently playing playlist
& song. See player.h for more info.
player_status
Maintains record keeping about what the media player is
up to. Is is playing, paused, and what position (in
seconds) into the current file is it? See `player.h` for
more info.
ui Maintains all key information about the display and each
of the 4 windows. Of key interest are the two
"scrollable-windows" (the library and playlist windows).
The struct maintains their vertical/horizontal scroll
offsets, and a few more things.
See `uinterface.h` for more info.
There are other globals, but few are "exported" in any of the .h files.
These include global structs in:
meta_info.c For maintaining the current display description,
sort description, and search/query filter. With
the exception of the display description, none of
these are exported, and should not be.
paint.c For maintaining the colors used for painting all
of the text to curses.
Code Structure: The Modules
---------------------------
First, the basic configuration is all done in `config.h`. Specifically,
* keybindings
* command-mode bindings
* a few other defaults (library width, path to mplayer, etc.)
is all done there. See that for quick fixes.
After that, the source code for vitunes is broken into 9 modules, each
relatively small. A brief description of each follows, starting with the
smallest. Note the code-naming conventions and which ones export a
global object that is used throughout the other modules.
Tracing through the source code from "main" to keybindings is, at this
point, relatively straight-forward.
MODULE DESCRIPTION
-------------- ----------------------------------------------------------
str2argv Contains only 2 functions used elsewhere. They are used
for converting a string (char*) to an 'int argc' and
'char *argv[]' pair, used for the command-mode function
bindings. The second function is used to free() a
previously built argc/argv structure.
player Contains all of the code to handle the child-process that
handles media playback. Includes loading files for
playback, pausing, seeking, etc.
Naming Convention: player_*
Global Variables Exported:
player - Record keeping for the child process.
player_status - Record keeping about the playback
itself (paused, position, etc.).
meta_info Contains all of the code to extract the meta information
(artist name, album name, song title, track number, genre,
and year) from a media-file. It makes uses of the
external TagLib library [1]. It contains a simple struct
used to represent all such info (meta_info).
In addition to this, the logic for sorting songs,
searching/filtering songs, and changing their display in
vitunes is contained here.
Naming Convention: mi_*
Global Variables Exported:
mi_display - Description of the current display
format.
playlist Contains all of the code to represent and work with
playlists, which is a simple struct containing an array
of meta_info's. Nothing more.
Naming Convention: playlist_*
medialib Contains all of the code to represent the media library,
which is the database of all known files and array of all
playlists. Handles initializing, loading, updating, and
adding to the database.
Naming Convention: medialib_*
Global Variables Exported:
mdb - The global media-library struct, containing
the database of known files and playlists.
uinterface A small abstraction layer on top of curses(3), mostly for
record keeping. Provides the code to setup the 4 windows,
resizing, and hiding/unhiding the library wndow.
Naming Convention: ui_*
swindow_*
Global Variables Exported:
ui - The global user interface object, which again
contains mostly record-keeping info.
paint All major display stuff is in here. Functions for
painting each of the 4 window, error/information
messages, and setting up colors.
Naming Convention: paint_*
Global Variables Exported:
colors - List of colors used for each colorable
object in vitunes.
keybindings All of the keybinding code is located here, including the
code for the default keybindings, the core bind and
unbind code, and more.
commands The run-time commands (things like ':set ...',
':color ...', etc.) is all contained here.
e_commands All code for each of the e-commands (vitunes -e CMD ...)
is here. Used exclusively in vitunes.c.
vitunes The "main" program. In normal mode, does setup of media-
library, user interface, and main input loop.
Also contains all of the code for all of the e-commands
(things like "vitunes -e update").
---
Hope this helps anyone interested in hacking on vitunes (specifically me... 6
months from now)
-Ryan Flannery 2 Jan. 2011
(Checked for accuracy) 1 Jan. 2012
References:
[1] http://developer.kde.org/~wheeler/taglib.html
[2] http://www.mplayerhq.hu/
CURRENT LIST OF BIG "TODO"'s:
* Fix sorting of `meta_info`'s so that numeric fields are sorted by their
numeric values rather than character representations. This would require
some re-working.
* Sorting of `meta_info`'s: perhaps I could add some magic to ignore a starting
"The" or "A" from the sorting? I dunno about this... I kinda like it the
way that it is.
* Original idea was to make the media player used be more general, so that it
wasn't specific to mplayer. Still working on this. Goal is to have it
setup so that one could do `vitunes -m /path/to/player` and the player
would communicate through stdin/stdout (using a pipe to vitunes) in a
unified way. That way, the player could be a simple shell script that
would allow 1. using different players, 2. using different players for
different media types, and 3. making vitunes even more general... e.g.
could launch an image viewer for images, or an image viewer for images in
the meta info of a song. Dunno. Still working the details of this out.
Could provide a shell script "wrapper" around multiple players/viewers.
* Update from using 8-color curses API to 256-API.
-> complicated... wtf!?!? I thought the [n]curses API was supposed to make
this easy?
:q
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