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->b_force )
144 if( 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;;
219 p_sys->p_es_video = es_out_Add( p_demux->out, &p_sys->fmt_video );
222 p_peek = p_peek_backup + 80*6+80*16*3 + 3; /* beginning of AAUX pack */
223 if( *p_peek == 0x50 )
225 dv_get_audio_format( &p_sys->fmt_audio, &p_peek[1] );
226 p_sys->p_es_audio = es_out_Add( p_demux->out, &p_sys->fmt_audio );
229 p_demux->pf_demux = Demux;
230 p_demux->pf_control = Control;
234 /*****************************************************************************
235 * Close: frees unused data
236 *****************************************************************************/
237 static void Close( vlc_object_t *p_this )
239 demux_t *p_demux = (demux_t*)p_this;
240 demux_sys_t *p_sys = p_demux->p_sys;
242 var_Destroy( p_demux, "rawdv-hurry-up");
246 /*****************************************************************************
247 * Demux: reads and demuxes data packets
248 *****************************************************************************
249 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
250 *****************************************************************************/
251 static int Demux( demux_t *p_demux )
253 demux_sys_t *p_sys = p_demux->p_sys;
255 bool b_audio = false;
257 if( p_sys->b_hurry_up )
260 p_sys->i_pcr = mdate() + (p_sys->i_dsf ? 120000 : 90000);
263 /* Call the pace control */
264 es_out_Control( p_demux->out, ES_OUT_SET_PCR, VLC_TS_0 + p_sys->i_pcr );
265 p_block = stream_Block( p_demux->s, p_sys->frame_size );
266 if( p_block == NULL )
272 if( p_sys->p_es_audio )
274 es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
275 p_sys->p_es_audio, &b_audio );
279 p_block->i_pts = VLC_TS_0 + p_sys->i_pcr;
283 block_t *p_audio_block = dv_extract_audio( p_block );
285 es_out_Send( p_demux->out, p_sys->p_es_audio, p_audio_block );
288 es_out_Send( p_demux->out, p_sys->p_es_video, p_block );
290 if( !p_sys->b_hurry_up )
292 p_sys->i_pcr += ( INT64_C(1000000) / p_sys->f_rate );
298 /*****************************************************************************
300 *****************************************************************************/
301 static int Control( demux_t *p_demux, int i_query, va_list args )
303 demux_sys_t *p_sys = p_demux->p_sys;
305 /* XXX: DEMUX_SET_TIME is precise here */
306 return demux_vaControlHelper( p_demux->s,
308 p_sys->frame_size * p_sys->f_rate * 8,
309 p_sys->frame_size, i_query, args );