git.sesse.net Git - vlc/blob - include/input_ext-intf.h

   1 /*****************************************************************************
   2  * input_ext-intf.h: structures of the input exported to the interface
   3  * This header provides structures to read the stream descriptors and
   4  * control the pace of reading.
   5  *****************************************************************************
   6  * Copyright (C) 1999, 2000 VideoLAN
   7  * $Id: input_ext-intf.h,v 1.48 2001/11/15 17:39:12 sam Exp $
   8  *
   9  * Authors: Christophe Massiot <massiot@via.ecp.fr>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  24  *****************************************************************************/
  25
  26 /*
  27  * Communication input -> interface
  28  */
  29 #define INPUT_MAX_PLUGINS   1
  30 /* FIXME ! */
  31 #define REQUESTED_MPEG         1
  32 #define REQUESTED_AC3          2
  33 #define REQUESTED_LPCM         3
  34 #define REQUESTED_NOAUDIO    255
  35
  36 #define OFFSETTOTIME_MAX_SIZE       10
  37
  38 /*****************************************************************************
  39  * es_descriptor_t: elementary stream descriptor
  40  *****************************************************************************
  41  * Describes an elementary stream, and includes fields required to handle and
  42  * demultiplex this elementary stream.
  43  *****************************************************************************/
  44 struct decoder_fifo_s;                         /* defined in input_ext-dec.h */
  45 struct pgrm_descriptor_s;
  46
  47 typedef struct es_descriptor_s
  48 {
  49     u16                     i_id;            /* stream ID for PS, PID for TS */
  50     u8                      i_stream_id;     /* stream ID defined in the PES */
  51     u8                      i_type;                           /* stream type */
  52     boolean_t               b_audio;      /* is the stream an audio stream that
  53                                            * will need to be discarded with
  54                                            * fast forward and slow motion ?  */
  55     u8                      i_cat;        /* stream category: video, audio,
  56                                            * spu, other */
  57
  58     char                    psz_desc[20]; /* description of ES: audio language
  59                                            * for instance ; NULL if not
  60                                            *  available */
  61
  62     /* Demultiplexer information */
  63     void *                  p_demux_data;
  64     struct pgrm_descriptor_s *
  65                             p_pgrm;  /* very convenient in the demultiplexer */
  66
  67     /* PES parser information */
  68     struct pes_packet_s *   p_pes;                            /* Current PES */
  69     struct data_packet_s *  p_last;   /* The last packet gathered at present */
  70     int                     i_pes_real_size;   /* as indicated by the header */
  71
  72     /* Decoder information */
  73     struct decoder_fifo_s * p_decoder_fifo;
  74     vlc_thread_t            thread_id;                  /* ID of the decoder */
  75
  76     count_t                 c_packets;                 /* total packets read */
  77     count_t                 c_invalid_packets;       /* invalid packets read */
  78
  79     /* Module properties */
  80     struct module_s *         p_module;
  81     struct decoder_config_s * p_config;
  82
  83 } es_descriptor_t;
  84
  85 /* Special PID values - note that the PID is only on 13 bits, and that values
  86  * greater than 0x1fff have no meaning in a stream */
  87 #define PROGRAM_ASSOCIATION_TABLE_PID   0x0000
  88 #define CONDITIONNAL_ACCESS_TABLE_PID   0x0001                   /* not used */
  89 #define EMPTY_ID                        0xffff    /* empty record in a table */
  90
  91
  92 /* ES Categories to be used by interface plugins */
  93 #define VIDEO_ES        0x00
  94 #define AUDIO_ES        0x01
  95 #define SPU_ES          0x02
  96 #define NAV_ES          0x03
  97 #define UNKNOWN_ES      0xFF
  98 /*****************************************************************************
  99  * pgrm_descriptor_t
 100  *****************************************************************************
 101  * Describes a program and list associated elementary streams. It is build by
 102  * the PSI decoder upon the informations carried in program map sections
 103  *****************************************************************************/
 104 typedef struct pgrm_descriptor_s
 105 {
 106     /* Program characteristics */
 107     u16                     i_number;                      /* program number */
 108     u8                      i_version;                     /* version number */
 109     boolean_t               b_is_ok;      /* Is the description up to date ? */
 110
 111     /* Service Descriptor (program name) - DVB extension */
 112     u8                      i_srv_type;
 113     char *                  psz_srv_name;
 114
 115     /* Synchronization information */
 116     mtime_t                 delta_cr;
 117     mtime_t                 cr_ref, sysdate_ref;
 118     mtime_t                 last_cr; /* reference to detect unexpected stream
 119                                       * discontinuities                      */
 120     mtime_t                 last_syscr;
 121     count_t                 c_average_count;
 122                            /* counter used to compute dynamic average values */
 123     int                     i_synchro_state;
 124
 125     /* Demultiplexer data */
 126     void *                  p_demux_data;
 127
 128     int                     i_es_number;      /* size of the following array */
 129     es_descriptor_t **      pp_es;                /* array of pointers to ES */
 130 } pgrm_descriptor_t;
 131
 132 /* Synchro states */
 133 #define SYNCHRO_OK          0
 134 #define SYNCHRO_START       1
 135 #define SYNCHRO_REINIT      2
 136
 137 /*****************************************************************************
 138  * input_area_t
 139  *****************************************************************************
 140  * Attributes for current area (title for DVD)
 141  *****************************************************************************/
 142 typedef struct input_area_s
 143 {
 144     /* selected area attributes */
 145     int                     i_id;        /* identificator for area */
 146     off_t                   i_start;     /* start offset of area */
 147     off_t                   i_size;      /* total size of the area
 148                                           * (in arbitrary units) */
 149
 150     /* navigation parameters */
 151     off_t                   i_tell;      /* actual location in the area
 152                                           * (in arbitrary units) */
 153     off_t                   i_seek;      /* next requested location
 154                                           * (changed by the interface thread */
 155
 156     /* area subdivision */
 157     int                     i_part_nb;   /* number of parts (chapter for DVD)*/
 158     int                     i_part;      /* currently selected part */
 159
 160     int                     i_angle_nb;  /* number of angles/title units */
 161     int                     i_angle;
 162
 163     /* offset to plugin related data */
 164     off_t                   i_plugin_data;
 165 } input_area_t;
 166
 167 /*****************************************************************************
 168  * stream_descriptor_t
 169  *****************************************************************************
 170  * Describes a stream and list its associated programs. Build upon
 171  * the information carried in program association sections (for instance)
 172  *****************************************************************************/
 173 typedef struct stream_descriptor_s
 174 {
 175     u16                     i_stream_id;                        /* stream id */
 176     boolean_t               b_changed;    /* if stream has been changed,
 177                                              we have to inform the interface */
 178     vlc_mutex_t             stream_lock;  /* to be taken every time you read
 179                                            * or modify stream, pgrm or es    */
 180
 181     /* Input method data */
 182     int                     i_method;       /* input method for stream: file,
 183                                                disc or network */
 184     boolean_t               b_pace_control;    /* can we read when we want ? */
 185     boolean_t               b_seekable;               /* can we do lseek() ? */
 186
 187     /* if (b_seekable) : */
 188     int                     i_area_nb;
 189     input_area_t **         pp_areas;    /* list of areas in stream == offset
 190                                           * interval with own properties */
 191     input_area_t *          p_selected_area;
 192     input_area_t *          p_new_area;  /* Newly selected area from
 193                                           * the interface */
 194
 195     u32                     i_mux_rate; /* the rate we read the stream (in
 196                                          * units of 50 bytes/s) ; 0 if undef */
 197
 198     /* New status and rate requested by the interface */
 199     int                     i_new_status, i_new_rate;
 200     int                     b_new_mute;          /* int because it can be -1 */
 201     vlc_cond_t              stream_wait; /* interface -> input in case of a
 202                                           * status change request            */
 203
 204     /* Demultiplexer data */
 205     void *                  p_demux_data;
 206
 207     /* Programs descriptions */
 208     int                     i_pgrm_number;    /* size of the following array */
 209     pgrm_descriptor_t **    pp_programs;        /* array of pointers to pgrm */
 210
 211     /* ES descriptions */
 212     int                     i_es_number;
 213     es_descriptor_t **      pp_es;             /* carried elementary streams */
 214     int                     i_selected_es_number;
 215     es_descriptor_t **      pp_selected_es;             /* ES with a decoder */
 216     es_descriptor_t *       p_newly_selected_es;   /* ES selected from
 217                                                     * the interface */
 218     es_descriptor_t *       p_removed_es;   /* ES removed from the interface */
 219
 220
 221     /* Stream control */
 222     stream_ctrl_t           control;
 223
 224     /* Statistics */
 225     count_t                 c_packets_read;                  /* packets read */
 226     count_t                 c_packets_trashed;            /* trashed packets */
 227 } stream_descriptor_t;
 228
 229 #define MUTE_NO_CHANGE      -1
 230
 231 /*****************************************************************************
 232  * input_thread_t
 233  *****************************************************************************
 234  * This structure includes all the local static variables of an input thread
 235  *****************************************************************************/
 236 struct vout_thread_s;
 237 struct bit_stream_s;
 238
 239 typedef struct input_thread_s
 240 {
 241     /* Thread properties and locks */
 242     boolean_t               b_die;                             /* 'die' flag */
 243     boolean_t               b_error;
 244     boolean_t               b_eof;
 245     vlc_thread_t            thread_id;            /* id for thread functions */
 246     int *                   pi_status;              /* temporary status flag */
 247
 248     /* Input module */
 249     struct module_s *       p_input_module;
 250
 251     /* Init/End */
 252     void                 (* pf_init)( struct input_thread_s * );
 253     void                 (* pf_open)( struct input_thread_s * );
 254     void                 (* pf_close)( struct input_thread_s * );
 255     void                 (* pf_end)( struct input_thread_s * );
 256     void                 (* pf_init_bit_stream)( struct bit_stream_s *,
 257                               struct decoder_fifo_s *,
 258                 void (* pf_bitstream_callback)( struct bit_stream_s *,
 259                                                 boolean_t ),
 260                               void * );
 261
 262     /* Read & Demultiplex */
 263     int                  (* pf_read)( struct input_thread_s *,
 264                                       struct data_packet_s * pp_packets[] );
 265     void                 (* pf_demux)( struct input_thread_s *,
 266                                        struct data_packet_s * );
 267
 268     /* Packet management facilities */
 269     struct data_packet_s *(*pf_new_packet)( void *, size_t );
 270     struct pes_packet_s *(* pf_new_pes)( void * );
 271     void                 (* pf_delete_packet)( void *,
 272                                                struct data_packet_s * );
 273     void                 (* pf_delete_pes)( void *, struct pes_packet_s * );
 274
 275     /* Stream control capabilities */
 276     int                  (* pf_set_area)( struct input_thread_s *,
 277                                           struct input_area_s * );
 278     int                  (* pf_rewind)( struct input_thread_s * );
 279                                            /* NULL if we don't support going *
 280                                             * backwards (it's gonna be fun)  */
 281     void                 (* pf_seek)( struct input_thread_s *, off_t );
 282
 283     char *                  p_source;
 284
 285     int                     i_handle;           /* socket or file descriptor */
 286     FILE *                  p_stream;                       /* if applicable */
 287     void *                  p_handle;          /* if i_handle isn't suitable */
 288     int                     i_read_once;        /* number of packet read by
 289                                                  * pf_read once */
 290     void *                  p_method_data;     /* data of the packet manager */
 291     void *                  p_plugin_data;             /* data of the plugin */
 292
 293     /* General stream description */
 294     stream_descriptor_t     stream;                            /* PAT tables */
 295
 296     count_t                 c_loops;
 297 } input_thread_t;
 298
 299 /* Input methods */
 300 /* The first figure is a general method that can be used in interface plugins ;
 301  * The second figure is a detailed sub-method */
 302 #define INPUT_METHOD_NONE         0x0            /* input thread is inactive */
 303 #define INPUT_METHOD_FILE        0x10   /* stream is read from file p_source */
 304 #define INPUT_METHOD_DISC        0x20   /* stream is read directly from disc */
 305 #define INPUT_METHOD_DVD         0x21             /* stream is read from DVD */
 306 #define INPUT_METHOD_VCD         0x22             /* stream is read from VCD */
 307 #define INPUT_METHOD_NETWORK     0x30         /* stream is read from network */
 308 #define INPUT_METHOD_UCAST       0x31                         /* UDP unicast */
 309 #define INPUT_METHOD_MCAST       0x32                       /* UDP multicast */
 310 #define INPUT_METHOD_BCAST       0x33                       /* UDP broadcast */
 311 #define INPUT_METHOD_VLAN_BCAST  0x34            /* UDP broadcast with VLANs */
 312
 313
 314 /* Status changing methods */
 315 #define INPUT_STATUS_END            0
 316 #define INPUT_STATUS_PLAY           1
 317 #define INPUT_STATUS_PAUSE          2
 318 #define INPUT_STATUS_FASTER         3
 319 #define INPUT_STATUS_SLOWER         4
 320
 321 /*****************************************************************************
 322  * Prototypes
 323  *****************************************************************************/
 324 struct input_thread_s * input_CreateThread ( struct playlist_item_s *,
 325                                              int *pi_status );
 326 void input_DestroyThread( struct input_thread_s *, int *pi_status );
 327
 328 void input_SetStatus( struct input_thread_s *, int );
 329 void input_Seek     ( struct input_thread_s *, off_t );
 330 void input_DumpStream( struct input_thread_s * );
 331 char * input_OffsetToTime( struct input_thread_s *, char * psz_buffer, off_t );
 332 int  input_ChangeES ( struct input_thread_s *, struct es_descriptor_s *, u8 );
 333 int  input_ToggleES ( struct input_thread_s *,
 334                       struct es_descriptor_s *,
 335                       boolean_t );
 336 int  input_ChangeArea( struct input_thread_s *, struct input_area_s * );
 337 int  input_ToggleGrayscale( struct input_thread_s * );
 338 int  input_ToggleMute( struct input_thread_s * );
 339 int  input_SetSMP( struct input_thread_s *, int );
 340