1 /*****************************************************************************
2 * dirac.c : Dirac Video demuxer
3 *****************************************************************************
4 * Copyright (C) 2002-2008 VLC authors and VideoLAN
7 * Authors: David Flynn <davidf@rd.bbc.co.uk>
8 * Based on vc1.c by: Laurent Aimar <fenrir@via.ecp.fr>
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU Lesser General Public License as published by
12 * the Free Software Foundation; either version 2.1 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU Lesser General Public License for more details.
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with this program; if not, write to the Free Software Foundation,
22 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
33 #include <vlc_common.h>
34 #include <vlc_plugin.h>
35 #include <vlc_demux.h>
36 #include <vlc_codec.h>
38 #define DEMUX_CFG_PREFIX "dirac-"
40 #define DEMUX_DTSOFFSET "dts-offset"
41 #define DEMUX_DTSOFFSET_TEXT N_("Value to adjust dts by")
42 #define DEMUX_DTSOFFSET_LONGTEXT DEMUX_DTSOFFSET_TEXT
44 /*****************************************************************************
46 *****************************************************************************/
47 static int Open ( vlc_object_t
* );
48 static void Close( vlc_object_t
* );
51 set_shortname( "Dirac");
52 set_category( CAT_INPUT
);
53 set_subcategory( SUBCAT_INPUT_DEMUX
);
54 set_description( N_("Dirac video demuxer" ) );
55 set_capability( "demux", 50 );
56 add_integer( DEMUX_CFG_PREFIX DEMUX_DTSOFFSET
, 0,
57 DEMUX_DTSOFFSET_TEXT
, DEMUX_DTSOFFSET_LONGTEXT
, false )
58 set_callbacks( Open
, Close
);
59 add_shortcut( "dirac" )
62 /*****************************************************************************
64 *****************************************************************************/
69 mtime_t i_pts_offset_lowtide
;
73 /* demuxer states, do not reorder (++ is used) */
74 DIRAC_DEMUX_DISCONT
= 0, /* signal a discontinuity to packetizer */
75 DIRAC_DEMUX_FIRST
, /* provide an origin timestamp for the packetizer */
76 DIRAC_DEMUX_STEADY
, /* normal operation */
79 decoder_t
*p_packetizer
;
82 static int Demux( demux_t
* );
83 static int Control( demux_t
*, int, va_list );
85 #define DIRAC_PACKET_SIZE 4096
87 /*****************************************************************************
88 * Open: initializes demux structures
89 *****************************************************************************/
90 static int Open( vlc_object_t
* p_this
)
92 demux_t
*p_demux
= (demux_t
*)p_this
;
94 const uint8_t *p_peek
;
97 if( vlc_stream_Peek( p_demux
->s
, &p_peek
, 5 ) < 5 ) return VLC_EGENERIC
;
99 if( p_peek
[0] != 'B' || p_peek
[1] != 'B' ||
100 p_peek
[2] != 'C' || p_peek
[3] != 'D') /* start of ParseInfo */
102 if( !p_demux
->obj
.force
) return VLC_EGENERIC
;
104 msg_Err( p_demux
, "This doesn't look like a Dirac stream (incorrect parsecode)" );
105 msg_Warn( p_demux
, "continuing anyway" );
108 p_demux
->pf_demux
= Demux
;
109 p_demux
->pf_control
= Control
;
110 p_demux
->p_sys
= p_sys
= calloc( 1, sizeof( demux_sys_t
) );
111 if( !p_sys
) return VLC_ENOMEM
;
113 p_sys
->i_pts_offset_lowtide
= INT64_MAX
;
114 p_sys
->i_state
= DIRAC_DEMUX_FIRST
;
116 p_sys
->i_dtsoffset
= var_CreateGetInteger( p_demux
, DEMUX_CFG_PREFIX DEMUX_DTSOFFSET
);
118 /* Load the packetizer */
119 es_format_Init( &fmt
, VIDEO_ES
, VLC_CODEC_DIRAC
);
120 p_sys
->p_packetizer
= demux_PacketizerNew( p_demux
, &fmt
, "dirac" );
121 if( !p_sys
->p_packetizer
)
130 /*****************************************************************************
131 * Close: frees unused data
132 *****************************************************************************/
133 static void Close( vlc_object_t
* p_this
)
135 demux_t
*p_demux
= (demux_t
*)p_this
;
136 demux_sys_t
*p_sys
= p_demux
->p_sys
;
138 demux_PacketizerDestroy( p_sys
->p_packetizer
);
140 if( p_sys
->i_pts_offset_lowtide
< INT64_MAX
&&
141 p_sys
->i_pts_offset_lowtide
> 0 )
143 msg_Warn( p_demux
, "For all packets seen, pts-dts (%"PRId64
") could be reduced to 0",
144 p_sys
->i_pts_offset_lowtide
);
149 /*****************************************************************************
150 * Demux: reads and demuxes data packets
151 *****************************************************************************
152 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
153 *****************************************************************************/
154 static int Demux( demux_t
*p_demux
)
156 demux_sys_t
*p_sys
= p_demux
->p_sys
;
157 block_t
*p_block_in
, *p_block_out
;
161 if( p_sys
->i_state
== DIRAC_DEMUX_DISCONT
)
164 p_block_in
= block_Alloc( 128 );
167 p_block_in
->i_flags
= BLOCK_FLAG_DISCONTINUITY
| BLOCK_FLAG_CORRUPTED
;
172 p_block_in
= vlc_stream_Block( p_demux
->s
, DIRAC_PACKET_SIZE
);
177 else if ( p_sys
->i_state
== DIRAC_DEMUX_FIRST
)
180 /* by default, timestamps are invalid.
181 * Except when we need an anchor point */
182 p_block_in
->i_dts
= VLC_TS_0
;
186 while( (p_block_out
= p_sys
->p_packetizer
->pf_packetize( p_sys
->p_packetizer
,
187 (p_block_in
) ? &p_block_in
: NULL
)) )
191 block_t
*p_next
= p_block_out
->p_next
;
192 p_block_out
->p_next
= NULL
;
194 if( p_sys
->p_es
== NULL
)
195 p_sys
->p_es
= es_out_Add( p_demux
->out
, &p_sys
->p_packetizer
->fmt_out
);
197 p_block_out
->i_dts
+= p_sys
->i_dtsoffset
;
198 p_sys
->i_dts
= p_block_out
->i_dts
;
200 /* track low watermark for pts_offset -- can be used to show
201 * when it is too large */
202 mtime_t i_delay
= p_block_out
->i_pts
- p_block_out
->i_dts
;
203 if( p_sys
->i_pts_offset_lowtide
> i_delay
)
205 p_sys
->i_pts_offset_lowtide
= i_delay
;
208 es_out_SetPCR( p_demux
->out
, p_block_out
->i_dts
);
209 es_out_Send( p_demux
->out
, p_sys
->p_es
, p_block_out
);
211 p_block_out
= p_next
;
215 return b_eof
? VLC_DEMUXER_EOF
: VLC_DEMUXER_SUCCESS
;
218 /*****************************************************************************
220 *****************************************************************************/
221 static int Control( demux_t
*p_demux
, int i_query
, va_list args
)
223 demux_sys_t
*p_sys
= p_demux
->p_sys
;
224 if( DEMUX_GET_TIME
== i_query
)
226 int64_t *pi64
= va_arg( args
, int64_t * );
227 *pi64
= p_sys
->i_dts
;
230 else if( DEMUX_GET_FPS
== i_query
)
232 if( !p_sys
->p_packetizer
->fmt_out
.video
.i_frame_rate
)
236 double *pd
= va_arg( args
, double * );
237 *pd
= (float) p_sys
->p_packetizer
->fmt_out
.video
.i_frame_rate
238 / p_sys
->p_packetizer
->fmt_out
.video
.i_frame_rate_base
;
243 if( DEMUX_SET_POSITION
== i_query
|| DEMUX_SET_TIME
== i_query
)
245 p_sys
->i_state
= DIRAC_DEMUX_DISCONT
;
247 return demux_vaControlHelper( p_demux
->s
, 0, -1, 0, 1, i_query
, args
);