1 /*****************************************************************************
2 * cdg.c : cdg file demux module for vlc
3 *****************************************************************************
4 * Copyright (C) 2007 Laurent Aimar
7 * Authors: Laurent Aimar <fenrir # via.ecp.fr>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU Lesser General Public License as published by
11 * the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this program; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
32 #include <vlc_common.h>
33 #include <vlc_plugin.h>
34 #include <vlc_demux.h>
36 /*****************************************************************************
38 *****************************************************************************/
39 static int Open ( vlc_object_t
* );
40 static void Close( vlc_object_t
* );
43 set_description( N_("CDG demuxer") )
44 set_category( CAT_INPUT
)
45 set_subcategory( SUBCAT_INPUT_DEMUX
)
46 set_capability( "demux", 3 )
47 set_callbacks( Open
, Close
)
48 add_shortcut( "cdg", "subtitle" )
51 /*****************************************************************************
53 *****************************************************************************/
54 static int Demux ( demux_t
* );
55 static int Control( demux_t
*, int i_query
, va_list args
);
65 #define CDG_FRAME_SIZE (96)
66 #define CDG_FRAME_RATE (75)
68 /*****************************************************************************
69 * Open: check file and initializes structures
70 *****************************************************************************/
71 static int Open( vlc_object_t
* p_this
)
73 demux_t
*p_demux
= (demux_t
*)p_this
;
76 /* Identify cdg file by extension, as there is no simple way to
78 if( !demux_IsPathExtension( p_demux
, ".cdg" ) && !demux_IsForced( p_demux
, "cdg" ) )
81 /* CDG file size has to be multiple of CDG_FRAME_SIZE (it works even
82 * if size is unknown ie 0) */
83 // if( (stream_Size( p_demux->s ) % CDG_FRAME_SIZE) != 0 )
85 // msg_Err( p_demux, "Reject CDG file based on its size" );
86 // return VLC_EGENERIC;
89 p_sys
= malloc( sizeof( demux_sys_t
) );
90 if( unlikely(p_sys
== NULL
) )
93 p_demux
->pf_demux
= Demux
;
94 p_demux
->pf_control
= Control
;
95 p_demux
->p_sys
= p_sys
;
98 es_format_Init( &p_sys
->fmt
, VIDEO_ES
, VLC_CODEC_CDG
);
99 p_sys
->fmt
.video
.i_width
= 300-2*6;
100 p_sys
->fmt
.video
.i_height
= 216-2*12 ;
101 p_sys
->fmt
.video
.i_visible_width
= p_sys
->fmt
.video
.i_width
;
102 p_sys
->fmt
.video
.i_visible_height
= p_sys
->fmt
.video
.i_height
;
104 p_sys
->p_es
= es_out_Add( p_demux
->out
, &p_sys
->fmt
);
106 /* There is CDG_FRAME_RATE frames per second */
107 date_Init( &p_sys
->pts
, CDG_FRAME_RATE
, 1 );
108 date_Set( &p_sys
->pts
, 0 );
113 /*****************************************************************************
114 * Demux: read packet and send them to decoders
115 *****************************************************************************
116 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
117 *****************************************************************************/
118 static int Demux( demux_t
*p_demux
)
120 demux_sys_t
*p_sys
= p_demux
->p_sys
;
125 i_delta
= INT64_C(1000000) / CDG_FRAME_RATE
;
127 p_block
= vlc_stream_Block( p_demux
->s
, CDG_FRAME_SIZE
);
128 if( p_block
== NULL
)
130 msg_Dbg( p_demux
, "cannot read data, eof" );
134 i_date
= vlc_stream_Tell( p_demux
->s
) / CDG_FRAME_SIZE
* i_delta
;
135 if( i_date
>= date_Get( &p_sys
->pts
) + i_delta
)
137 p_block
->i_dts
= p_block
->i_pts
= i_date
;
138 date_Set( &p_sys
->pts
, i_date
);
142 p_block
->i_dts
= i_date
;
143 p_block
->i_pts
= date_Get( &p_sys
->pts
);
146 es_out_Control( p_demux
->out
, ES_OUT_SET_PCR
, p_block
->i_pts
);
148 es_out_Send( p_demux
->out
, p_sys
->p_es
, p_block
);
153 /*****************************************************************************
154 * Close: frees unused data
155 *****************************************************************************/
156 static void Close ( vlc_object_t
* p_this
)
158 demux_t
*p_demux
= (demux_t
*)p_this
;
159 demux_sys_t
*p_sys
= p_demux
->p_sys
;
164 /*****************************************************************************
166 *****************************************************************************/
167 static int Control( demux_t
*p_demux
, int i_query
, va_list args
)
169 uint64_t i_old_offset
= vlc_stream_Tell( p_demux
->s
);
170 int i_ret
= demux_vaControlHelper( p_demux
->s
, 0, -1,
171 8*CDG_FRAME_SIZE
*CDG_FRAME_RATE
, CDG_FRAME_SIZE
,
173 if( !i_ret
&& ( i_query
== DEMUX_SET_POSITION
|| i_query
== DEMUX_SET_TIME
) )
175 date_Set( &p_demux
->p_sys
->pts
,
176 vlc_stream_Tell( p_demux
->s
) / CDG_FRAME_SIZE
*
177 INT64_C(1000000) / CDG_FRAME_RATE
);
178 if ( i_old_offset
> vlc_stream_Tell( p_demux
->s
) )
179 i_ret
= vlc_stream_Seek( p_demux
->s
, 0 );
181 i_ret
= vlc_stream_Seek( p_demux
->s
, i_old_offset
);