PyXMMS-remote Manual

This manual documents PyXMMS-remote (version 1.12, 7 February 2005), a command-line interface to XMMS.

Introduction

PyXMMS-remote is a Python program using PyXMMS to control an XMMS session. PyXMMS-remote is free software. PyXMMS-remote is licensed under the GNU GPL version 2.

Notes:

• XMMS (the X MultiMedia System) is a multimedia player written for the X Window System. XMMS provides a library (libxmms) that contains functions providing full control over an XMMS session from an external program. The official XMMS home page is located at http://www.xmms.org/.

• PyXMMS is a set of Python bindings for libxmms, including higher-level interfaces than that provided by libxmms.

With PyXMMS-remote, you can tell or retrieve quite a lot of things to/from an XMMS session with shell commands (or shell scripts or whatever you want, but if what you want to do is really complex, you'd better use PyXMMS directly).

The following command tells the XMMS session 0 (default) to start playing the current playlist entry:

pyxmms-remote play

The following command tells the XMMS session number 2 to stop playing:

pyxmms-remote -s 2 stop

Here is a way to:

• start XMMS if necessary

• add some entries (files or URLs) to the playlist

• start playing from the first entry added

pyxmms-remote E entry...

equivalent to the not-so-short following command:

pyxmms-remote enqueue_and_play_launch_if_session_not_started entry...

1. How to use this program

The general form of a valid invocation of PyXMMS-remote is:

pyxmms-remote [option]... command [command_argument]...

where the valid options are:

-s session

--session=session

The XMMS session to control. If you simply launched one instance of XMMS, it should be your session 0 (each Unix user has its own session numbering scheme). This setting defaults to 0.

-p program

--program=program

The executable to invoke with the command `enqueue_and_play_launch_if_session_not_started' (or `E') if the selected XMMS session (as defined by the `-s' option) is not already running. The default is `xmms'. The PATH variable is searched if necessary.

--poll-delay=delay

When PyXMMS-remote is called with the `enqueue_and_play_launch_if_session_not_started' (or `E') command, it will spawn an XMMS process if the requested session(1) is not already running. Then, it will tell the requested session to add the specified files to the playlist and start playing, but that cannot be done before the session is ready to handle requests. Therefore, PyXMMS-remote will try to contact this XMMS session at regular intervals of delay seconds and give up if the session didn't answer after timeout seconds, as specified with the `--timeout' option.

delay must be a non-negative floating-point number.

--timeout=timeout

Timeout in seconds when checking whether an XMMS session started by the `enqueue_and_play_launch_if_session_not_started' (or `E') command is ready to handle requests (see `--poll-delay').

timeout must be a non-negative floating-point number.

-f decimals

--floats-precision=decimals

The number of decimals displayed for floats by commands such as `get_eq'. The default is 2.

--help

Display usage information and exit.

2. Command reference

2.1 Commands from libxmms

The following commands are direct bindings to the `xmms_remote_*' functions of libxmms.

`playlist file_or_url... enqueue'

Set the playlist contents or enqueue files/URLs in it.

enqueue should be a boolean (0 = false, 1 = true); false does not work in XMMS 1.2.6.

`playlist_add file_or_url...'

Add files/URLs to the playlist.

`playlist_delete entry_number'

Delete the playlist entry number entry_number (starting at 0).

`playlist_clear'

Clear the playlist.

`playlist_add_url_string string'

`add_url_to_playlist string'

Add string (file or URL) to the playlist.

`playlist_ins_url_string string pos'

`insert_url_into_playlist_at_pos string pos'

Insert string (file or URL) at position pos (index starting at 0) in the playlist.

`get_playlist_length'

Get the playlist length (number of files/URLs).

`get_playlist_pos'

Get the current playlist position (index starting at 0).

`set_playlist_pos pos'

Set the current playlist position to pos (index starting at 0).

`get_playlist_file entry'

Get the absolute file name corresponding to the entry entry (index starting at 0) in the playlist.

`get_playlist_title entry'

Get the title of the entry entry (index starting at 0) in the playlist.

`get_playlist_time entry'

Get the duration in milliseconds of a the entry entry in the playlist.

`play'

Play the current playlist entry.

`pause'

Pause.

`play_pause'

Play or pause (toggle).

`stop'

Stop.

`eject'

Show the eject dialog box.

`playlist_prev'

Jump to the previous entry in the playlist.

`playlist_next'

Jump to the next entry in the playlist.

`jump_to_time milliseconds'

Jump to the given time since the beginning of the current playlist entry.

Note: at least in XMMS 1.2.7, the resolution seems to be 1 second although the time to jump to is given in milliseconds.

`is_running'

Tell whether the selected XMMS session is running (0 means "no", 1 means "yes").

`is_playing'

Tell whether the selected XMMS session is playing (0 means "no", 1 means "yes"). When in pause, XMMS is considered to be playing for this command.

`is_paused'

Tell whether the selected XMMS session is paused (0 means "no", 1 means "yes").

`get_output_time'

Get the time in milliseconds since the beginning of the current playlist entry.

`get_info'

Get information about the current playlist entry, namely its rate (in bps), its frequency (in Hz) and its number of channels (1 = mono, 2 = stereo...).

`get_volume'

Get left and right volumes.

`set_volume left_volume right_volume'

Set left and right volumes.

`get_main_volume'

Get the greater of left and right volumes.

`set_main_volume volume'

Set the "main" volume. The left and right volumes are calculated (and set) from the supplied volume argument and the current balance.

`get_balance'

Get the balance value.

`set_balance value'

Set the balance according to value (-100 means "100 % left", 0 means "centered", 100 means "100 % right").

`get_eq'

Get the equalizer settings (preamp and gain in dB for the ten frequency bands defined in XMMS).

`set_eq preamp band0 band1... band9'

Set the equalizer settings (preamp and gain in dB for the ten frequency bands defined in XMMS). band0 corresponds to the lowest frequency and band9 to the highest frequency.

`get_eq_preamp'

Get the equalizer preamp value in dB.

`set_eq_preamp gain'

Set the equalizer preamp value to gain (in dB).

`get_eq_band band_number'

Get the gain (in dB) for band band_number (between 0 and 9, both inclusive).

`set_eq_band band_number gain'

Set the gain for band band_number (between 0 and 9, both inclusive) to gain (in dB).

`get_skin'

Get the current skin absolute file name.

`set_skin absolute_file_name'

Set the skin from absolute_file_name.

`main_win_toggle display'

`main_win_set_visible display'

Hide (if display is 0) or show (if display is 1) the main window (yes, this is not a real toggle function).

`pl_win_toggle display'

`playlist_win_set_visible display'

Hide (if display is 0) or show (if display is 1) the playlist window (yes, this is not a real toggle function).

`eq_win_toggle display'

`equalizer_win_set_visible display'

Hide (if display is 0) or show (if display is 1) the equalizer window (yes, this is not a real toggle function).

`is_main_win'

Tell whether the main window is visible (0 means "no", 1 means "yes").

`is_pl_win'

Tell whether the playlist window is visible (0 means "no", 1 means "yes").

`is_eq_win'

Tell whether the equalizer window is visible (0 means "no", 1 means "yes").

`show_prefs_box'

Show the preferences dialog box.

`show_about_box'

Show about box. Does not to work in XMMS 1.2.6 and 1.2.8 (at least).

`toggle_aot always'

`set_always_on_top_state always'

Set the always-on-top flag for the main window. always should be a boolean (0 or 1), but the implementation of this function in XMMS 1.2.6 looks weird to me, so I cannot tell you more about always than "it seems not to be used". This function still does not seem to work in XMMS 1.2.8.

`toggle_repeat'

Toggle repeat mode.

`toggle_shuffle'

Toggle shuffle mode.

`is_repeat'

Tell whether repeat mode is active (0 means "no", 1 means "yes").

`is_shuffle'

Tell whether shuffle mode is active (0 means "no", 1 means "yes").

`get_version'

Get version (of what?).

The code fragment that answers this request in XMMS 1.2.6 is:

case CMD_GET_VERSION: ctrl_write_gint(pkt->fd, 0x09a3); ...

I suspect it is the version of the protocol in use through the XMMS control socket (which is how libxmms talks to XMMS, by the way). If you understand this better than I, please let me know.

`quit'

Quit the selected XMMS session.

`play_files file_or_url... (deprecated in libxmms)'

Clear the playlist, add the specified files/URLs to it and start playing. This function is deprecated. Use a combination of playlist and play instead.

2.2 Commands specific to PyXMMS

The following commands are bindings to functions of PyXMMS which are not defined in libxmms--but very likely to be implemented with functions of libxmms.

a file_or_url...

playlist_add_allow_relative file_or_url...

Add files/URLs to the playlist, allowing relative file names.

e file_or_url...

enqueue_and_play file_or_url...

Add files/URLs to the playlist and start playing from the first one (that is, the first file_or_url argument specified).

E file_or_url...

enqueue_and_play_launch_if_session_not_started file_or_url...

Add files/URLs to the playlist and start playing from the first one (that is, the first file_or_url argument specified). This command is identical to enqueue_and_play except that it spawns an XMMS process if the selected session is not running.

fade_out [action [nb_steps [step_duration [restore_volume]]]]

Progressively decrease the main volume, then stop or pause (depending on action), then optionally restore the original main volume setting.

action

Whether to stop or pause the playback after the fade out. Valid values are stop and pause. Default is stop.

nb_steps

Number of decrease-volume steps to use (default is 20)

step_duration

Duration of a step (floating point number, in seconds; default is 0.5)

restore_volume

Whether to restore the main volume after the fade out. Valid values are 1 to have the volume restored and 0 to have it remain at 0. Default is 1.

3. Environment variables

There is currently one environment variable specific to PyXMMS-remote: PYXMMS_REMOTE_XMMS_PRG. This sets the XMMS executable name (absolute or relative) just as the `-p' option.

Note: command-line options take precedence over environment variables.

4. Setup tips

4.1 Midnight commander

You can use a rule like:

regex/\.([mM][pP]3|[oO][gG][gG]|[mM]3[uU])$
        Open=pyxmms-remote E %s
        View=pyxmms-remote E %s
	Icon=sound.xpm

in your `~/.mc/bindings' (personal) or `/etc/mc/mc.ext' (system-wide, and might be located elsewhere in your system--this is the Debian location).

This way, you will enqueue and play (as well as launch XMMS before if necessary) the selected file(s) when you press Enter or F3.

4.2 MIME support

You can associate a PyXMMS-remote invocation with the MIME types "application/ogg" (cf. RFC 3534), "application/x-ogg" (used when "application/ogg" was not yet registered as an official MIME type), "audio/mpeg" and "audio/x-mpegurl". On a Debian system (with the mime-support package), this can be done with the following lines in your `~/.mailcap' or the system-wide `/etc/mailcap' (if for some reason you did not install the Debian package for PyXMMS-remote):

application/ogg; pyxmms-remote E "%s"; test=test -n "$DISPLAY"
application/x-ogg; pyxmms-remote E "%s"; test=test -n "$DISPLAY"
audio/mpeg; pyxmms-remote E "%s"; test=test -n "$DISPLAY"
audio/x-mpegurl; pyxmms-remote E "%s"; test=test -n "$DISPLAY"

A. GNU GENERAL PUBLIC LICENSE

Copyright © 1989, 1991 Free Software Foundation, Inc.
59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.

Preamble

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When we speak of free software, we are referring to freedom, not price. Our General Public Licenses are designed to make sure that you have the freedom to distribute copies of free software (and charge for this service if you wish), that you receive source code or can get it if you want it, that you can change the software or use pieces of it in new free programs; and that you know you can do these things.

To protect your rights, we need to make restrictions that forbid anyone to deny you these rights or to ask you to surrender the rights. These restrictions translate to certain responsibilities for you if you distribute copies of the software, or if you modify it.

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The precise terms and conditions for copying, distribution and modification follow.

1. This License applies to any program or other work which contains a notice placed by the copyright holder saying it may be distributed under the terms of this General Public License. The "Program," below, refers to any such program or work, and a "work based on the Program" means either the Program or any derivative work under copyright law: that is to say, a work containing the Program or a portion of it, either verbatim or with modifications and/or translated into another language. (Hereinafter, translation is included without limitation in the term "modification.") Each licensee is addressed as "you."

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2. You may copy and distribute verbatim copies of the Program's source code as you receive it, in any medium, provided that you conspicuously and appropriately publish on each copy an appropriate copyright notice and disclaimer of warranty; keep intact all the notices that refer to this License and to the absence of any warranty; and give any other recipients of the Program a copy of this License along with the Program.

   You may charge a fee for the physical act of transferring a copy, and you may at your option offer warranty protection in exchange for a fee.

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   2. You must cause any work that you distribute or publish, that in whole or in part contains or is derived from the Program or any part thereof, to be licensed as a whole at no charge to all third parties under the terms of this License.

   3. If the modified program normally reads commands interactively when run, you must cause it, when started running for such interactive use in the most ordinary way, to print or display an announcement including an appropriate copyright notice and a notice that there is no warranty (or else, saying that you provide a warranty) and that users may redistribute the program under these conditions, and telling the user how to view a copy of this License. (Exception: if the Program itself is interactive but does not normally print such an announcement, your work based on the Program is not required to print an announcement.)

   These requirements apply to the modified work as a whole. If identifiable sections of that work are not derived from the Program, and can be reasonably considered independent and separate works in themselves, then this License, and its terms, do not apply to those sections when you distribute them as separate works. But when you distribute the same sections as part of a whole which is a work based on the Program, the distribution of the whole must be on the terms of this License, whose permissions for other licensees extend to the entire whole, and thus to each and every part regardless of who wrote it.

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   In addition, mere aggregation of another work not based on the Program with the Program (or with a work based on the Program) on a volume of a storage or distribution medium does not bring the other work under the scope of this License.

4. You may copy and distribute the Program (or a work based on it, under Section 2) in object code or executable form under the terms of Sections 1 and 2 above provided that you also do one of the following:
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12. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.

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How to Apply These Terms to Your New Programs

If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to achieve this is to make it free software which everyone can redistribute and change under these terms.

To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively convey the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found.

one line to give the program's name and an idea of what it does.
Copyright (C) 19yy  name of author

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program 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 General Public License for more details.

You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.

Also add information on how to contact you by electronic and paper mail.

If the program is interactive, make it output a short notice like this when it starts in an interactive mode:

Gnomovision version 69, Copyright (C) 20yy name of author
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details
type `show w'.  This is free software, and you are welcome
to redistribute it under certain conditions; type `show c' 
for details.

The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, the commands you use may be called something other than `show w' and `show c'; they could even be mouse-clicks or menu items--whatever suits your program.

You should also get your employer (if you work as a programmer) or your school, if any, to sign a "copyright disclaimer" for the program, if necessary. Here is a sample; alter the names:

Yoyodyne, Inc., hereby disclaims all copyright
interest in the program `Gnomovision'
(which makes passes at compilers) written 
by James Hacker.

signature of Ty Coon, 1 April 1989
Ty Coon, President of Vice

This General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Library General Public License instead of this License.

Index

Footnotes

(1)

The one specified with the `--session' option.

Table of Contents

Introduction
1. How to use this program
2. Command reference

2.1 Commands from libxmms
2.2 Commands specific to PyXMMS

3. Environment variables
4. Setup tips

4.1 Midnight commander
4.2 MIME support

A. GNU GENERAL PUBLIC LICENSE

Preamble
How to Apply These Terms to Your New Programs

Index

Short Table of Contents

Introduction
1. How to use this program
2. Command reference
3. Environment variables
4. Setup tips
A. GNU GENERAL PUBLIC LICENSE
Index

About this document

where the Example assumes that the current position is at Subsubsection One-Two-Three of a document of the following structure:

• 1. Section One
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  • 1.2 Subsection One-Two
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    • 1.2.2 Subsubsection One-Two-Two
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    • 1.2.4 Subsubsection One-Two-Four
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    • ...
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