1 /*****************************************************************************
2 * vc1.c : VC1 Video demuxer
3 *****************************************************************************
4 * Copyright (C) 2002-2004 VLC authors and VideoLAN
6 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU Lesser General Public License as published by
10 * the Free Software Foundation; either version 2.1 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public License
19 * along with this program; if not, write to the Free Software Foundation,
20 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
21 *****************************************************************************/
23 /*****************************************************************************
25 *****************************************************************************/
31 #include <vlc_common.h>
32 #include <vlc_plugin.h>
33 #include <vlc_demux.h>
34 #include <vlc_codec.h>
36 /*****************************************************************************
38 *****************************************************************************/
39 static int Open ( vlc_object_t
* );
40 static void Close( vlc_object_t
* );
42 #define FPS_TEXT N_("Frames per Second")
43 #define FPS_LONGTEXT N_("Desired frame rate for the VC-1 stream.")
46 set_shortname( "VC-1")
47 set_category( CAT_INPUT
)
48 set_subcategory( SUBCAT_INPUT_DEMUX
)
49 set_description( N_("VC1 video demuxer" ) )
50 set_capability( "demux", 0 )
51 add_float( "vc1-fps", 25.0, FPS_TEXT
, FPS_LONGTEXT
, true )
52 set_callbacks( Open
, Close
)
56 /*****************************************************************************
58 *****************************************************************************/
65 decoder_t
*p_packetizer
;
68 static int Demux( demux_t
* );
69 static int Control( demux_t
*, int, va_list );
71 #define VC1_PACKET_SIZE 4096
73 /*****************************************************************************
74 * Open: initializes demux structures
75 *****************************************************************************/
76 static int Open( vlc_object_t
* p_this
)
78 demux_t
*p_demux
= (demux_t
*)p_this
;
80 const uint8_t *p_peek
;
83 if( vlc_stream_Peek( p_demux
->s
, &p_peek
, 4 ) < 4 ) return VLC_EGENERIC
;
85 if( p_peek
[0] != 0x00 || p_peek
[1] != 0x00 ||
86 p_peek
[2] != 0x01 || p_peek
[3] != 0x0f ) /* Sequence header */
88 if( !p_demux
->obj
.force
)
90 msg_Warn( p_demux
, "vc-1 module discarded (no startcode)" );
94 msg_Err( p_demux
, "this doesn't look like a VC-1 ES stream, "
95 "continuing anyway" );
98 p_sys
= malloc( sizeof( demux_sys_t
) );
99 if( unlikely(p_sys
== NULL
) )
102 p_demux
->pf_demux
= Demux
;
103 p_demux
->pf_control
= Control
;
104 p_demux
->p_sys
= p_sys
;
107 p_sys
->f_fps
= var_CreateGetFloat( p_demux
, "vc1-fps" );
108 if( p_sys
->f_fps
< 0.001f
)
111 /* Load the packetizer */
112 es_format_Init( &fmt
, VIDEO_ES
, VLC_CODEC_VC1
);
113 p_sys
->p_packetizer
= demux_PacketizerNew( p_demux
, &fmt
, "VC-1" );
114 if( !p_sys
->p_packetizer
)
122 /*****************************************************************************
123 * Close: frees unused data
124 *****************************************************************************/
125 static void Close( vlc_object_t
* p_this
)
127 demux_t
*p_demux
= (demux_t
*)p_this
;
128 demux_sys_t
*p_sys
= p_demux
->p_sys
;
130 demux_PacketizerDestroy( p_sys
->p_packetizer
);
134 /*****************************************************************************
135 * Demux: reads and demuxes data packets
136 *****************************************************************************
137 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
138 *****************************************************************************/
139 static int Demux( demux_t
*p_demux
)
141 demux_sys_t
*p_sys
= p_demux
->p_sys
;
142 block_t
*p_block_in
, *p_block_out
;
145 p_block_in
= vlc_stream_Block( p_demux
->s
, VC1_PACKET_SIZE
);
146 if( p_block_in
== NULL
)
153 p_block_in
->i_dts
= p_sys
->i_dts
!= VLC_TICK_INVALID
? p_sys
->i_dts
: VLC_TICK_0
;
154 p_block_in
->i_pts
= p_block_in
->i_dts
;
157 while( (p_block_out
= p_sys
->p_packetizer
->pf_packetize( p_sys
->p_packetizer
,
158 p_block_in
? &p_block_in
: NULL
)) )
162 block_t
*p_next
= p_block_out
->p_next
;
164 p_block_out
->p_next
= NULL
;
166 if( p_sys
->p_es
== NULL
)
168 p_sys
->p_packetizer
->fmt_out
.b_packetized
= true;
169 p_sys
->p_packetizer
->fmt_out
.i_id
= 0;
170 p_sys
->p_es
= es_out_Add( p_demux
->out
, &p_sys
->p_packetizer
->fmt_out
);
173 es_out_SetPCR( p_demux
->out
, VLC_TICK_0
+ p_sys
->i_dts
);
174 p_block_out
->i_dts
= VLC_TICK_0
+ p_sys
->i_dts
;
175 p_block_out
->i_pts
= VLC_TICK_0
+ p_sys
->i_dts
;
177 es_out_Send( p_demux
->out
, p_sys
->p_es
, p_block_out
);
179 p_block_out
= p_next
;
181 if( p_sys
->p_packetizer
->fmt_out
.video
.i_frame_rate
> 0 &&
182 p_sys
->p_packetizer
->fmt_out
.video
.i_frame_rate_base
> 0 )
183 p_sys
->i_dts
+= vlc_tick_from_samples(
184 p_sys
->p_packetizer
->fmt_out
.video
.i_frame_rate_base
,
185 p_sys
->p_packetizer
->fmt_out
.video
.i_frame_rate
);
186 else if( p_sys
->f_fps
> 0.001f
)
187 p_sys
->i_dts
+= (vlc_tick_t
)((float) CLOCK_FREQ
/ p_sys
->f_fps
);
189 p_sys
->i_dts
+= VLC_TICK_FROM_MS(40);
193 return b_eof
? VLC_DEMUXER_EOF
: VLC_DEMUXER_SUCCESS
;
196 /*****************************************************************************
198 *****************************************************************************/
199 static int Control( demux_t
*p_demux
, int i_query
, va_list args
)
201 /* demux_sys_t *p_sys = p_demux->p_sys; */
202 /* FIXME calculate the bitrate */
203 if( i_query
== DEMUX_SET_TIME
)
206 return demux_vaControlHelper( p_demux
->s
,
208 0, 1, i_query
, args
);