1 /*****************************************************************************
2 * vc1.c : VC1 Video demuxer
3 *****************************************************************************
4 * Copyright (C) 2002-2004 VLC authors and VideoLAN
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>
35 #include <vlc_codec.h>
37 /*****************************************************************************
39 *****************************************************************************/
40 static int Open ( vlc_object_t
* );
41 static void Close( vlc_object_t
* );
43 #define FPS_TEXT N_("Frames per Second")
44 #define FPS_LONGTEXT N_("Desired frame rate for the VC-1 stream.")
47 set_shortname( "VC-1")
48 set_category( CAT_INPUT
)
49 set_subcategory( SUBCAT_INPUT_DEMUX
)
50 set_description( N_("VC1 video demuxer" ) )
51 set_capability( "demux", 0 )
52 add_float( "vc1-fps", 25.0, FPS_TEXT
, FPS_LONGTEXT
, true )
53 set_callbacks( Open
, Close
)
57 /*****************************************************************************
59 *****************************************************************************/
66 decoder_t
*p_packetizer
;
69 static int Demux( demux_t
* );
70 static int Control( demux_t
*, int, va_list );
72 #define VC1_PACKET_SIZE 4096
74 /*****************************************************************************
75 * Open: initializes demux structures
76 *****************************************************************************/
77 static int Open( vlc_object_t
* p_this
)
79 demux_t
*p_demux
= (demux_t
*)p_this
;
81 const uint8_t *p_peek
;
84 if( vlc_stream_Peek( p_demux
->s
, &p_peek
, 4 ) < 4 ) return VLC_EGENERIC
;
86 if( p_peek
[0] != 0x00 || p_peek
[1] != 0x00 ||
87 p_peek
[2] != 0x01 || p_peek
[3] != 0x0f ) /* Sequence header */
89 if( !p_demux
->obj
.force
)
91 msg_Warn( p_demux
, "vc-1 module discarded (no startcode)" );
95 msg_Err( p_demux
, "this doesn't look like a VC-1 ES stream, "
96 "continuing anyway" );
99 p_sys
= malloc( sizeof( demux_sys_t
) );
100 if( unlikely(p_sys
== NULL
) )
103 p_demux
->pf_demux
= Demux
;
104 p_demux
->pf_control
= Control
;
105 p_demux
->p_sys
= p_sys
;
108 p_sys
->f_fps
= var_CreateGetFloat( p_demux
, "vc1-fps" );
109 if( p_sys
->f_fps
< 0.001f
)
112 /* Load the packetizer */
113 es_format_Init( &fmt
, VIDEO_ES
, VLC_CODEC_VC1
);
114 p_sys
->p_packetizer
= demux_PacketizerNew( p_demux
, &fmt
, "VC-1" );
115 if( !p_sys
->p_packetizer
)
123 /*****************************************************************************
124 * Close: frees unused data
125 *****************************************************************************/
126 static void Close( vlc_object_t
* p_this
)
128 demux_t
*p_demux
= (demux_t
*)p_this
;
129 demux_sys_t
*p_sys
= p_demux
->p_sys
;
131 demux_PacketizerDestroy( p_sys
->p_packetizer
);
135 /*****************************************************************************
136 * Demux: reads and demuxes data packets
137 *****************************************************************************
138 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
139 *****************************************************************************/
140 static int Demux( demux_t
*p_demux
)
142 demux_sys_t
*p_sys
= p_demux
->p_sys
;
143 block_t
*p_block_in
, *p_block_out
;
146 p_block_in
= vlc_stream_Block( p_demux
->s
, VC1_PACKET_SIZE
);
147 if( p_block_in
== NULL
)
154 p_block_in
->i_dts
= VLC_TICK_0
;
155 p_block_in
->i_pts
= VLC_TICK_0
;
158 while( (p_block_out
= p_sys
->p_packetizer
->pf_packetize( p_sys
->p_packetizer
,
159 p_block_in
? &p_block_in
: NULL
)) )
163 block_t
*p_next
= p_block_out
->p_next
;
165 p_block_out
->p_next
= NULL
;
167 if( p_sys
->p_es
== NULL
)
169 p_sys
->p_packetizer
->fmt_out
.b_packetized
= true;
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
);