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Playing DVDs / Audio CDs over the network
=========================================
xine can be used to play DVDs and Audio CDs over the network.
ok, but.... why?
there are some reasons people want to do that:
- because you may have a 200 discs DVD changer on your garage and you
want to watch them on your room.
- because you don't want to have a lousy cdrom driver around when
listening to your favorite music.
- because the computer that is hooked to the TV doesn't have a dvdrom.
- because you can :)
network block devices
---------------------
yes, network block device (nbd) could be an option for that. however:
- they don't support ioctls which are needed for cd audio playback and
dvd key exchange. (obs: one may write a custom ioctl code for enbd)
- a completely user space solution is more portable.
- the user space solution can handle failures more gratefuly and gives
better control of closing/opening the device.
installation for audio cds
--------------------------
- you must compile the cdda_server.c that comes with xine-lib sources:
xine-lib$ cd misc
xine-lib/misc$ make cdda_server
gcc -W -Wall -g -o cdda_server cdda_server.c -ldl
Your xine-lib source tree needs to be configured for that, so please
run ./configure in the toplevel sourcedir on a fresh tree.
- start cdda_server at the machine that has the cdrom drive:
xine-lib/misc$ ./cdda_server /dev/cdrom 3000
note: 3000 is the port number to listen.
- start xine on the client machine with:
$ xine cdda://server_address:3000/1
that will play the first track of the CD. in order to use the
GUI button for "CD" you have to change the setting media.audio_cd.device
to point to the server.
installation for dvds
---------------------
- compile and run cdda_server (see above).
note: you may also need to install libdvdcss or some equivalent
library on your server.
- patch libdvdcss on the client.
note: no CSS code is needed at all, so it would be possible to use a
kind of "dummy" dvd library that is API compatible with libdvdcss.
a sample patch is provided for libdvdcss-1.2.6, install it as follow:
libdvdcss-1.2.6$ patch -p1 < ../xine-lib/misc/libdvdcss-1.2.6-network.patch
libdvdcss-1.2.6$ ./bootstrap
libdvdcss-1.2.6$ make
libdvdcss-1.2.6$ make install
- start xine on the client machine with:
$ xine dvd://server_address:3000/
(don't forget the trailing slash)
protocol details
----------------
the network protocol is pretty simple. it consists of text-based commands
and replies over a TCP stream.
command format:
<command> <arg0> <arg1> <arg2> ... \n
reply format:
<error code> <n> <value0> <value1> ... \n
followed by n bytes of binary data (like cd or dvd sectors)
cdda commands:
cdda_open
<error code> 0
cdda_read <start_frame> <num_frames>
<error code> <n>
<n bytes (frames)>
cdda_tochdr
<error code> 0 <first_track> <last_track>
cdda_tocentry
<error code> 0 <track_mode> <first_frame_min> <first_frame_sec> <first_frame_frame>
dvd commands:
dvd_open
<error code> 0
dvd_error
<error code> <n>
<n bytes (error string)>
dvd_read <blocks> <flags>
<error code> <n>
<n bytes (blocks)>
dvd_seek <block> <flags>
<error code> 0
dvd_title <block>
<error code> 0
---
version of this file:
$Id: README.network_dvd,v 1.3 2004/12/12 22:00:48 mroi Exp $
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