########################
# MPlayer DVDNAV patch #
########################

Implemented:
------------
    - You choose the title with parameters that it will play (eg. mplayer dvdnav://1)
    - dvdnav stream can open in other device
	(using: "-dvd-device" options)
    - dvdnav is using libmpdvdkit2 (CSS)
    - You can set the nav menu language 
	(using: "-mlang" options)
    - it drawes the menu button with simple light box
	(using: "-dvdnav-menutype 1" or "-dvdnav-menutype 2" options)
    - it drawes the menu button with spu (partially)
	(using: "-dvdnav-menutype 0" or "-dvdnav-menutype 2" options)
    - selection the subtitle language with "vobsub_lang" command ('j')
    - the still frame works too (partially)
    - waiting time length at still frame event
    - the nav menu settings can be used to (partially)
	(settings: audio and subtitle language)
    - can be used with gmplayer
	(using: "Open... -> Play DVDNAV..." or "DVDNAV -> Open disc...")
    - menu selection can be used with mouse in gmplayer (partially)
    - root menu selection can be used with gmplayer
	(using: "DVDNAV -> Main menu")
    - audio language selection can be used in gmplayer
	(using: "DVDNAV -> Audio languages -> xxx")
    - subtitle language selection can be used in gmplayer
	(using: "DVDNAV -> Subtitle languages -> xxx")
    - the query of the time length of title stream
    - in the spudec_draw_scaled() the nav button spu of the resizing
    - color spu menu button

Not implemented:
----------------
    - the skip of the first play domain
    - the activation event of the menu button showing
    - the selection of the angle with parameters
    - the selection of the angle with nav menu
    - dvdnav using with "-indentify" parameters
    - chache using
    - You can set the dvdnav audio and subtitle language.
	(using: "-alang" and "-slang" options)
    - You choose the chapter with parameters that it will play.
	(using: "-chapter" options)

Known BUGs:
-----------
    - ...

Installing a MPlayer dvdnav patch:
----------------------
    1. Copy stream_dvdnav.c & stream_dvdnav.h files to libmpdemux directory
    2. Copy vd_videostill.c & vd_videostill.h files to libmpcodecs directory
    3. Create libmpdvdnav directory
    4. Copy this file to libmpdvdnav directory:
	Makefile
	libdvdnav_changes.diff
        vm.h
	vmcmd.h
	vmcmd.c
	vm.c
	settings.c
	searching.c
	remap.h
	remap.c
	read_cache.h
	read_cache.c
	navigation.c
	highlight.c
	dvd_types.h
	dvdnav_internal.h
	dvdnav.h
	dvdnav_events.h
	dvdnav.c
	decoder.h
	decoder.c
	config.h
    5. patch mplayer with navmplayer.patch file
    6. optional Gui: patch with navgui.patch file
    7. reconfigure with ./configure --enable-dvdnav ...

New options:
------------
    -mlang           select DVD menu language (by 2-char country code)
    -dvdnav-menutype set DVD menu button type: 0: spu, 1: simple box, 2: spu & simple box
    -dvdnav-trace    if the build is done with USE_MPDVDNAV_TRACE (--enable-dvdnav-trace) option
		     then the mplayer printers the libdvdnav trace messages
    -dvdnav-force-menu   enable force menu (if not spu then display simple box)
    -dvdnav-noforce-menu disable force menu
    
New libdvdnav functions (in stream_dvdnav):
-------------------------------------------
    dvdnav_status_t dvdnav_still_back(dvdnav_t *self);
    dvdnav_status_t dvdnav_wait_back(dvdnav_t *self);
    dvdnav_status_t dvdnav_wait_still_clear(dvdnav_t *self);
    dvdnav_status_t dvdnav_is_still_cell(dvdnav_t *self, int *flag);
    dvdnav_status_t dvdnav_get_pgc(dvdnav_t *self, int *pg_num);
    dvdnav_status_t dvdnav_button_select_auto_action(dvdnav_t *self, int mode);
    dvdnav_status_t dvdnav_get_audio_attr(dvdnav_t *self, uint8_t audio_mum, audio_attr_t *audio_attr);
    dvdnav_status_t dvdnav_get_spu_attr(dvdnav_t *self, uint8_t audio_mum, subp_attr_t *subp_attr);
    
    Get audio_attr and subp_attr with language code, audio format determination.
    All printf(STDOUT, ... ) was converted into mp_msg(MSGT_CPLAYER,MSGL_INFO, ... )
    All printerr( ... ) was converted into mp_msg(MSGT_CPLAYER,MSGL_ERR, ... )
    All dprintf( ... ) was converted into mp_msg(MSGT_CPLAYER,MSGL_DB2, ... )
    
Main modifications:
-------------------
	    #ifdef USE_MPDVDNAV
		...
	    #else
		...
	    #endif
	or
	    #ifndef USE_MPDVDNAV
		...
	    #endif

    libmpdemux/demuxec.c:
	If stream eof (DVDNAV_STILL_FRAME) or "Too many audio/video packets in the buffer..." not problem then
	    stream->type=STERAMTYPE_DVDNAV: no message, but return with eof.
    spudec.c:
	spudec_handle_t structure expansion with nav menu part image and parameters
	spudec_process_data() nav menu is set then using nav button palette (packet->alpha and packet->palette)
	int spudec_dvdnav_menu_box(void *this) cut nav button area with only button area draw to display
    libvo/sub.c:
	OSDTYPE_DVDNAV new type with show simple light box in nav button area
    libmpcodecs/dec_video.c:
	new function (replaced decode_video function) decode_video_still: 
	    int decode_video_still(sh_video_t *sh_video,unsigned char *start,int in_size,int drop_frame,int enable_still)
	If enable_still and in_size<0 then draw stored frame image in (mp_image_t) smpi.
	If enable_still and in_size>0 and correct decode frame image then store image in (mp_image_t) smpi.
    	    (It will use copy_mpi() or other solution?)
    mplayer.c:
	uninit_player() if set dvdnav_continue_play then not close stream and vo.
	main() play video (decode a frame) if eof video_read_frame() call decode_video_still and continue.
	main() after key events dvdnav event processing code:
	    get event in dvdnav_priv->stream_dvdnav_event_t structure
	    processing:
		if cell_change and new title then set dvdnav_continue_play and goto_next_file.
	    clear  dvdnav_priv->stream_dvdnav_event_t structure
    Gui/interface.c:
	guiIntfStruct.DVDNAV settings by dvdnav_priv
    Gui/mplayer/mw.c:
	evSetDVDNAVSubtitle: set dvdsub_id, dvdnav_go_spu and then it doesn't reopen stream
	evSetDVDNAVAudio: set audio_id, dvdnav_go_audio and then it doesn't reopen stream
	evSetDVDNAVChapter: set dvdnav_go_part and then it doesn't reopen stream
	evSetDVDNAVTitle: set dvdnav_go_title and then it doesn't reopen stream
	evMenuDVDNAV: set dvdnav_go_menu and then it doesn't reopen stream
	dvdnav_go_... will be processed by dvdnav event handler in mplayer.c
    Gui/mplayer/sw.c:
	store's window size in dvdnav_window_width and dvdnav_window_height
	store's mouse position in dvdnav_mouse_x and dvdnav_mouse_y
	store's mouse button event in dvdnav_mouse_button
	dvdnav_window_... and dvdnav_mouse_... will be processed by dvdnav_mouse() in dvdnav_stream.c
    Gui/mplayer/gtk/menu.c:
	Creates DVDNAVSubMenu just like DVDSubMenu, but addes a new item it's "Main menu" too.

Useful links:
-------------
    SourceForge.net: DVD tools for Linux (libdvdnav-0.1.10):
    http://sourceforge.net/projects/dvd/

I am sorry to say that my English knowledge isn't good.
Best regards! Ötvös Attila (Attila, Otvos).