1 /*****************************************************************************
2 * rawdv.c : raw DV input module for vlc
3 *****************************************************************************
4 * Copyright (C) 2001-2007 VLC authors and VideoLAN
7 * Authors: Gildas Bazin <gbazin@netcourrier.com>
8 * Paul Corke <paul dot corke at datatote dot co dot uk>
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>
39 /*****************************************************************************
41 *****************************************************************************/
42 #define HURRYUP_TEXT N_( "Hurry up" )
43 #define HURRYUP_LONGTEXT N_( "The demuxer will advance timestamps if the " \
44 "input can't keep up with the rate." )
46 static int Open ( vlc_object_t
* );
47 static void Close( vlc_object_t
* );
51 set_description( N_("DV (Digital Video) demuxer") )
52 set_capability( "demux", 3 )
53 set_category( CAT_INPUT
)
54 set_subcategory( SUBCAT_INPUT_DEMUX
)
55 add_bool( "rawdv-hurry-up", false, HURRYUP_TEXT
, HURRYUP_LONGTEXT
, false )
56 set_callbacks( Open
, Close
)
57 add_shortcut( "rawdv" )
61 /*****************************************************************************
62 A little bit of background information (copied over from libdv glossary).
64 - DIF block: A block of 80 bytes. This is the basic data framing unit of the
65 DVC tape format, analogous to sectors of hard disc.
67 - Video Section: Each DIF sequence contains a video section, consisting of
68 135 DIF blocks, which are further subdivided into Video Segments.
70 - Video Segment: A video segment consists of 5 DIF blocks, each corresponding
71 to a single compressed macroblock.
73 *****************************************************************************/
75 /*****************************************************************************
76 * Definitions of structures used by this plugin
77 *****************************************************************************/
79 int8_t sct
; /* Section type (header,subcode,aux,audio,video) */
80 int8_t dsn
; /* DIF sequence number (0-12) */
81 int fsc
; /* First (0)/Second channel (1) */
82 int8_t dbn
; /* DIF block number (0-134) */
86 int dsf
; /* DIF sequence flag: 525/60 (0) or 625,50 (1) */
100 es_out_id_t
*p_es_video
;
101 es_format_t fmt_video
;
103 es_out_id_t
*p_es_audio
;
104 es_format_t fmt_audio
;
110 /* program clock reference (in units of 90kHz) */
115 /*****************************************************************************
117 *****************************************************************************/
118 static int Demux( demux_t
* );
119 static int Control( demux_t
*, int i_query
, va_list args
);
121 /*****************************************************************************
122 * Open: initializes raw DV demux structures
123 *****************************************************************************/
124 static int Open( vlc_object_t
* p_this
)
126 demux_t
*p_demux
= (demux_t
*)p_this
;
129 const uint8_t *p_peek
, *p_peek_backup
;
132 dv_header_t dv_header
;
135 /* It isn't easy to recognize a raw DV stream. The chances that we'll
136 * mistake a stream from another type for a raw DV stream are too high, so
137 * we'll rely on the file extension to trigger this demux. Alternatively,
138 * it is possible to force this demux. */
140 /* Check for DV file extension */
141 if( !demux_IsPathExtension( p_demux
, ".dv" ) && !p_demux
->obj
.force
)
144 if( vlc_stream_Peek( p_demux
->s
, &p_peek
, DV_PAL_FRAME_SIZE
) <
147 /* Stream too short ... */
148 msg_Err( p_demux
, "cannot peek()" );
151 p_peek_backup
= p_peek
;
153 /* fill in the dv_id_t structure */
154 i_dword
= GetDWBE( p_peek
); p_peek
+= 4;
155 dv_id
.sct
= i_dword
>> (32 - 3);
157 dv_id
.dsn
= i_dword
>> (32 - 4);
159 dv_id
.fsc
= i_dword
>> (32 - 1);
161 dv_id
.dbn
= i_dword
>> (32 - 8);
166 msg_Warn( p_demux
, "not a raw DV stream header" );
170 /* fill in the dv_header_t structure */
171 dv_header
.dsf
= i_dword
>> (32 - 1);
173 if( i_dword
>> (32 - 1) ) /* incorrect bit */
175 msg_Warn( p_demux
, "incorrect bit" );
179 i_dword
= GetDWBE( p_peek
); p_peek
+= 4;
181 dv_header
.apt
= i_dword
>> (32 - 3);
183 dv_header
.tf1
= i_dword
>> (32 - 1);
185 dv_header
.ap1
= i_dword
>> (32 - 3);
187 dv_header
.tf2
= i_dword
>> (32 - 1);
189 dv_header
.ap2
= i_dword
>> (32 - 3);
191 dv_header
.tf3
= i_dword
>> (32 - 1);
193 dv_header
.ap3
= i_dword
>> (32 - 3);
195 p_peek
+= 72; /* skip rest of DIF block */
197 p_demux
->p_sys
= p_sys
= malloc( sizeof( demux_sys_t
) );
201 p_sys
->b_hurry_up
= var_CreateGetBool( p_demux
, "rawdv-hurry-up" );
202 msg_Dbg( p_demux
, "Realtime DV Source: %s", (p_sys
->b_hurry_up
)?"Yes":"No" );
204 p_sys
->i_dsf
= dv_header
.dsf
;
205 p_sys
->frame_size
= dv_header
.dsf
? DV_PAL_FRAME_SIZE
206 : DV_NTSC_FRAME_SIZE
;
207 p_sys
->f_rate
= dv_header
.dsf
? 25 : 29.97;
210 p_sys
->p_es_video
= NULL
;
211 p_sys
->p_es_audio
= NULL
;
213 p_sys
->i_bitrate
= 0;
215 es_format_Init( &p_sys
->fmt_video
, VIDEO_ES
, VLC_CODEC_DV
);
216 p_sys
->fmt_video
.video
.i_width
= 720;
217 p_sys
->fmt_video
.video
.i_height
= dv_header
.dsf
? 576 : 480;;
218 p_sys
->fmt_video
.video
.i_visible_width
= p_sys
->fmt_video
.video
.i_width
;
219 p_sys
->fmt_video
.video
.i_visible_height
= p_sys
->fmt_video
.video
.i_height
;
221 p_sys
->p_es_video
= es_out_Add( p_demux
->out
, &p_sys
->fmt_video
);
224 p_peek
= p_peek_backup
+ 80*6+80*16*3 + 3; /* beginning of AAUX pack */
225 if( *p_peek
== 0x50 )
227 dv_get_audio_format( &p_sys
->fmt_audio
, &p_peek
[1] );
228 p_sys
->p_es_audio
= es_out_Add( p_demux
->out
, &p_sys
->fmt_audio
);
231 p_demux
->pf_demux
= Demux
;
232 p_demux
->pf_control
= Control
;
236 /*****************************************************************************
237 * Close: frees unused data
238 *****************************************************************************/
239 static void Close( vlc_object_t
*p_this
)
241 demux_t
*p_demux
= (demux_t
*)p_this
;
242 demux_sys_t
*p_sys
= p_demux
->p_sys
;
244 var_Destroy( p_demux
, "rawdv-hurry-up");
248 /*****************************************************************************
249 * Demux: reads and demuxes data packets
250 *****************************************************************************
251 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
252 *****************************************************************************/
253 static int Demux( demux_t
*p_demux
)
255 demux_sys_t
*p_sys
= p_demux
->p_sys
;
257 bool b_audio
= false;
259 if( p_sys
->b_hurry_up
)
262 p_sys
->i_pcr
= vlc_tick_now() + (p_sys
->i_dsf
? VLC_TICK_FROM_MS(120) : VLC_TICK_FROM_MS(90));
265 /* Call the pace control */
266 es_out_SetPCR( p_demux
->out
, VLC_TICK_0
+ p_sys
->i_pcr
);
267 p_block
= vlc_stream_Block( p_demux
->s
, p_sys
->frame_size
);
268 if( p_block
== NULL
)
269 return VLC_DEMUXER_EOF
;
271 if( p_sys
->p_es_audio
)
273 es_out_Control( p_demux
->out
, ES_OUT_GET_ES_STATE
,
274 p_sys
->p_es_audio
, &b_audio
);
278 p_block
->i_pts
= VLC_TICK_0
+ p_sys
->i_pcr
;
282 block_t
*p_audio_block
= dv_extract_audio( p_block
);
284 es_out_Send( p_demux
->out
, p_sys
->p_es_audio
, p_audio_block
);
287 es_out_Send( p_demux
->out
, p_sys
->p_es_video
, p_block
);
289 if( !p_sys
->b_hurry_up
)
291 p_sys
->i_pcr
+= vlc_tick_rate_duration( p_sys
->f_rate
);
294 return VLC_DEMUXER_SUCCESS
;
297 /*****************************************************************************
299 *****************************************************************************/
300 static int Control( demux_t
*p_demux
, int i_query
, va_list args
)
302 demux_sys_t
*p_sys
= p_demux
->p_sys
;
304 /* XXX: DEMUX_SET_TIME is precise here */
305 return demux_vaControlHelper( p_demux
->s
,
307 p_sys
->frame_size
* p_sys
->f_rate
* 8,
308 p_sys
->frame_size
, i_query
, args
);