modules/demux/rawdv.c

   1 /*****************************************************************************
   2  * rawdv.c : raw DV input module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2001-2007 VLC authors and VideoLAN
   5  *
   6  * Authors: Gildas Bazin <gbazin@netcourrier.com>
   7  *          Paul Corke <paul dot corke at datatote dot co dot uk>
   8  *
   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.
  13  *
  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.
  18  *
  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  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_plugin.h>
  34 #include <vlc_demux.h>
  35
  36 #include "rawdv.h"
  37
  38 /*****************************************************************************
  39  * Module descriptor
  40  *****************************************************************************/
  41 #define HURRYUP_TEXT N_( "Hurry up" )
  42 #define HURRYUP_LONGTEXT N_( "The demuxer will advance timestamps if the " \
  43                 "input can't keep up with the rate." )
  44
  45 static int  Open ( vlc_object_t * );
  46 static void Close( vlc_object_t * );
  47
  48 vlc_module_begin ()
  49     set_shortname( "DV" )
  50     set_description( N_("DV (Digital Video) demuxer") )
  51     set_capability( "demux", 0 )
  52     set_category( CAT_INPUT )
  53     set_subcategory( SUBCAT_INPUT_DEMUX )
  54     add_bool( "rawdv-hurry-up", false, HURRYUP_TEXT, HURRYUP_LONGTEXT, false )
  55     set_callbacks( Open, Close )
  56     /* It isn't easy to recognize a raw DV stream. The chances that we'll
  57      * mistake a stream from another type for a raw DV stream are too high, so
  58      * we'll rely on the file extension to trigger this demux. Alternatively,
  59      * it is possible to force this demux. */
  60     add_shortcut( "rawdv" )
  61     add_file_extension("dv")
  62 vlc_module_end ()
  63
  64
  65 /*****************************************************************************
  66  A little bit of background information (copied over from libdv glossary).
  67
  68  - DIF block: A block of 80 bytes. This is the basic data framing unit of the
  69        DVC tape format, analogous to sectors of hard disc.
  70
  71  - Video Section: Each DIF sequence contains a video section, consisting of
  72        135 DIF blocks, which are further subdivided into Video Segments.
  73
  74  - Video Segment: A video segment consists of 5 DIF blocks, each corresponding
  75        to a single compressed macroblock.
  76
  77 *****************************************************************************/
  78
  79 /*****************************************************************************
  80  * Definitions of structures used by this plugin
  81  *****************************************************************************/
  82 typedef struct {
  83     int8_t sct;      /* Section type (header,subcode,aux,audio,video) */
  84     int8_t dsn;      /* DIF sequence number (0-12) */
  85     int    fsc;      /* First (0)/Second channel (1) */
  86     int8_t dbn;      /* DIF block number (0-134) */
  87 } dv_id_t;
  88
  89 typedef struct {
  90     int    dsf;      /* DIF sequence flag: 525/60 (0) or 625,50 (1) */
  91     int8_t apt;
  92     int    tf1;
  93     int8_t ap1;
  94     int    tf2;
  95     int8_t ap2;
  96     int    tf3;
  97     int8_t ap3;
  98 } dv_header_t;
  99
 100 typedef struct
 101 {
 102     int    frame_size;
 103
 104     es_out_id_t *p_es_video;
 105     es_format_t  fmt_video;
 106
 107     es_out_id_t *p_es_audio;
 108     es_format_t  fmt_audio;
 109
 110     int    i_dsf;
 111     double f_rate;
 112     int    i_bitrate;
 113
 114     /* program clock reference (in units of 90kHz) */
 115     vlc_tick_t i_pcr;
 116     bool b_hurry_up;
 117 } demux_sys_t;
 118
 119 /*****************************************************************************
 120  * Local prototypes
 121  *****************************************************************************/
 122 static int Demux( demux_t * );
 123 static int Control( demux_t *, int i_query, va_list args );
 124
 125 /*****************************************************************************
 126  * Open: initializes raw DV demux structures
 127  *****************************************************************************/
 128 static int Open( vlc_object_t * p_this )
 129 {
 130     demux_t     *p_demux = (demux_t*)p_this;
 131     demux_sys_t *p_sys;
 132
 133     const uint8_t *p_peek, *p_peek_backup;
 134
 135     uint32_t    i_dword;
 136     dv_header_t dv_header;
 137     dv_id_t     dv_id;
 138
 139     if( vlc_stream_Peek( p_demux->s, &p_peek, DV_PAL_FRAME_SIZE ) <
 140         DV_NTSC_FRAME_SIZE )
 141         return VLC_EGENERIC;
 142
 143     p_peek_backup = p_peek;
 144
 145     /* fill in the dv_id_t structure */
 146     i_dword = GetDWBE( p_peek ); p_peek += 4;
 147     dv_id.sct = i_dword >> (32 - 3);
 148     i_dword <<= 8;
 149     dv_id.dsn = i_dword >> (32 - 4);
 150     i_dword <<= 4;
 151     dv_id.fsc = i_dword >> (32 - 1);
 152     i_dword <<= 4;
 153     dv_id.dbn = i_dword >> (32 - 8);
 154     i_dword <<= 8;
 155
 156     if( dv_id.sct != 0 )
 157     {
 158         msg_Warn( p_demux, "not a raw DV stream header" );
 159         return VLC_EGENERIC;
 160     }
 161
 162     /* fill in the dv_header_t structure */
 163     dv_header.dsf = i_dword >> (32 - 1);
 164     i_dword <<= 1;
 165     if( i_dword >> (32 - 1) ) /* incorrect bit */
 166     {
 167         msg_Warn( p_demux, "incorrect bit" );
 168         return VLC_EGENERIC;
 169     }
 170
 171     i_dword = GetDWBE( p_peek ); p_peek += 4;
 172     i_dword <<= 5;
 173     dv_header.apt = i_dword >> (32 - 3);
 174     i_dword <<= 3;
 175     dv_header.tf1 = i_dword >> (32 - 1);
 176     i_dword <<= 5;
 177     dv_header.ap1 = i_dword >> (32 - 3);
 178     i_dword <<= 3;
 179     dv_header.tf2 = i_dword >> (32 - 1);
 180     i_dword <<= 5;
 181     dv_header.ap2 = i_dword >> (32 - 3);
 182     i_dword <<= 3;
 183     dv_header.tf3 = i_dword >> (32 - 1);
 184     i_dword <<= 5;
 185     dv_header.ap3 = i_dword >> (32 - 3);
 186
 187     p_peek += 72;                                  /* skip rest of DIF block */
 188
 189     p_demux->p_sys      = p_sys = malloc( sizeof( demux_sys_t ) );
 190     if( !p_sys )
 191         return VLC_ENOMEM;
 192
 193     p_sys->b_hurry_up = var_CreateGetBool( p_demux, "rawdv-hurry-up" );
 194     msg_Dbg( p_demux, "Realtime DV Source: %s", (p_sys->b_hurry_up)?"Yes":"No" );
 195
 196     p_sys->i_dsf = dv_header.dsf;
 197     p_sys->frame_size = dv_header.dsf ? DV_PAL_FRAME_SIZE
 198                                       : DV_NTSC_FRAME_SIZE;
 199     p_sys->f_rate = dv_header.dsf ? 25 : 29.97;
 200
 201     p_sys->i_pcr = 0;
 202     p_sys->p_es_video = NULL;
 203     p_sys->p_es_audio = NULL;
 204
 205     p_sys->i_bitrate = 0;
 206
 207     es_format_Init( &p_sys->fmt_video, VIDEO_ES, VLC_CODEC_DV );
 208     p_sys->fmt_video.video.i_width = 720;
 209     p_sys->fmt_video.video.i_height= dv_header.dsf ? 576 : 480;;
 210     p_sys->fmt_video.video.i_visible_width = p_sys->fmt_video.video.i_width;
 211     p_sys->fmt_video.video.i_visible_height = p_sys->fmt_video.video.i_height;
 212
 213     p_sys->p_es_video = es_out_Add( p_demux->out, &p_sys->fmt_video );
 214
 215     /* Audio stuff */
 216     p_peek = p_peek_backup + 80*6+80*16*3 + 3; /* beginning of AAUX pack */
 217     if( *p_peek == 0x50 )
 218     {
 219         dv_get_audio_format( &p_sys->fmt_audio, &p_peek[1] );
 220         p_sys->p_es_audio = es_out_Add( p_demux->out, &p_sys->fmt_audio );
 221     }
 222
 223     p_demux->pf_demux   = Demux;
 224     p_demux->pf_control = Control;
 225     return VLC_SUCCESS;
 226 }
 227
 228 /*****************************************************************************
 229  * Close: frees unused data
 230  *****************************************************************************/
 231 static void Close( vlc_object_t *p_this )
 232 {
 233     demux_t     *p_demux = (demux_t*)p_this;
 234     demux_sys_t *p_sys  = p_demux->p_sys;
 235
 236     var_Destroy( p_demux, "rawdv-hurry-up");
 237     free( p_sys );
 238 }
 239
 240 /*****************************************************************************
 241  * Demux: reads and demuxes data packets
 242  *****************************************************************************
 243  * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
 244  *****************************************************************************/
 245 static int Demux( demux_t *p_demux )
 246 {
 247     demux_sys_t *p_sys  = p_demux->p_sys;
 248     block_t     *p_block;
 249     bool  b_audio = false;
 250
 251     if( p_sys->b_hurry_up )
 252     {
 253          /* 3 frames */
 254         p_sys->i_pcr = vlc_tick_now() + (p_sys->i_dsf ? VLC_TICK_FROM_MS(120) : VLC_TICK_FROM_MS(90));
 255     }
 256
 257     /* Call the pace control */
 258     es_out_SetPCR( p_demux->out, VLC_TICK_0 + p_sys->i_pcr );
 259     p_block = vlc_stream_Block( p_demux->s, p_sys->frame_size );
 260     if( p_block == NULL )
 261         return VLC_DEMUXER_EOF;
 262
 263     if( p_sys->p_es_audio )
 264     {
 265         es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
 266                         p_sys->p_es_audio, &b_audio );
 267     }
 268
 269     p_block->i_dts =
 270     p_block->i_pts = VLC_TICK_0 + p_sys->i_pcr;
 271
 272     if( b_audio )
 273     {
 274         block_t *p_audio_block = dv_extract_audio( p_block );
 275         if( p_audio_block )
 276             es_out_Send( p_demux->out, p_sys->p_es_audio, p_audio_block );
 277     }
 278
 279     es_out_Send( p_demux->out, p_sys->p_es_video, p_block );
 280
 281     if( !p_sys->b_hurry_up )
 282     {
 283         p_sys->i_pcr += vlc_tick_rate_duration( p_sys->f_rate );
 284     }
 285
 286     return VLC_DEMUXER_SUCCESS;
 287 }
 288
 289 /*****************************************************************************
 290  * Control:
 291  *****************************************************************************/
 292 static int Control( demux_t *p_demux, int i_query, va_list args )
 293 {
 294     demux_sys_t *p_sys  = p_demux->p_sys;
 295
 296     /* XXX: DEMUX_SET_TIME is precise here */
 297     return demux_vaControlHelper( p_demux->s,
 298                                    0, -1,
 299                                    p_sys->frame_size * p_sys->f_rate * 8,
 300                                    p_sys->frame_size, i_query, args );
 301 }
 302