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 1.45 2001/11/08 14:45:44 stef 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 } es_descriptor_t;
  79
  80 /* Special PID values - note that the PID is only on 13 bits, and that values
  81  * greater than 0x1fff have no meaning in a stream */
  82 #define PROGRAM_ASSOCIATION_TABLE_PID   0x0000
  83 #define CONDITIONNAL_ACCESS_TABLE_PID   0x0001                   /* not used */
  84 #define EMPTY_ID                        0xffff    /* empty record in a table */
  85
  86 /* ES streams types - see ISO/IEC 13818-1 table 2-29 numbers */
  87 #define MPEG1_VIDEO_ES      0x01
  88 #define MPEG2_VIDEO_ES      0x02
  89 #define MPEG1_AUDIO_ES      0x03
  90 #define MPEG2_AUDIO_ES      0x04
  91 #define AC3_AUDIO_ES        0x81
  92 /* These ones might violate the norm : */
  93 #define DVD_SPU_ES          0x82
  94 #define LPCM_AUDIO_ES       0x83
  95 #define UNKNOWN_ES          0xFF
  96
  97 /* ES Categories to be used by interface plugins */
  98 #define VIDEO_ES        0x00
  99 #define AUDIO_ES        0x01
 100 #define SPU_ES          0x02
 101 #define NAV_ES          0x03
 102 #define UNKNOWN_ES      0xFF
 103 /*****************************************************************************
 104  * pgrm_descriptor_t
 105  *****************************************************************************
 106  * Describes a program and list associated elementary streams. It is build by
 107  * the PSI decoder upon the informations carried in program map sections
 108  *****************************************************************************/
 109 typedef struct pgrm_descriptor_s
 110 {
 111     /* Program characteristics */
 112     u16                     i_number;                      /* program number */
 113     u8                      i_version;                     /* version number */
 114     boolean_t               b_is_ok;      /* Is the description up to date ? */
 115
 116     /* Service Descriptor (program name) - DVB extension */
 117     u8                      i_srv_type;
 118     char *                  psz_srv_name;
 119
 120     /* Synchronization information */
 121     mtime_t                 delta_cr;
 122     mtime_t                 cr_ref, sysdate_ref;
 123     mtime_t                 last_cr; /* reference to detect unexpected stream
 124                                       * discontinuities                      */
 125     mtime_t                 last_syscr;
 126     count_t                 c_average_count;
 127                            /* counter used to compute dynamic average values */
 128     int                     i_synchro_state;
 129
 130     /* Demultiplexer data */
 131     void *                  p_demux_data;
 132
 133     int                     i_es_number;      /* size of the following array */
 134     es_descriptor_t **      pp_es;                /* array of pointers to ES */
 135 } pgrm_descriptor_t;
 136
 137 /* Synchro states */
 138 #define SYNCHRO_OK          0
 139 #define SYNCHRO_START       1
 140 #define SYNCHRO_REINIT      2
 141
 142 /*****************************************************************************
 143  * input_area_t
 144  *****************************************************************************
 145  * Attributes for current area (title for DVD)
 146  *****************************************************************************/
 147 typedef struct input_area_s
 148 {
 149     /* selected area attributes */
 150     int                     i_id;        /* identificator for area */
 151     off_t                   i_start;     /* start offset of area */
 152     off_t                   i_size;      /* total size of the area
 153                                           * (in arbitrary units) */
 154
 155     /* navigation parameters */
 156     off_t                   i_tell;      /* actual location in the area
 157                                           * (in arbitrary units) */
 158     off_t                   i_seek;      /* next requested location
 159                                           * (changed by the interface thread */
 160
 161     /* area subdivision */
 162     int                     i_part_nb;   /* number of parts (chapter for DVD)*/
 163     int                     i_part;      /* currently selected part */
 164
 165     int                     i_angle_nb;  /* number of angles/title units */
 166     int                     i_angle;
 167
 168     /* offset to plugin related data */
 169     off_t                   i_plugin_data;
 170 } input_area_t;
 171
 172 /*****************************************************************************
 173  * stream_descriptor_t
 174  *****************************************************************************
 175  * Describes a stream and list its associated programs. Build upon
 176  * the information carried in program association sections (for instance)
 177  *****************************************************************************/
 178 typedef struct stream_descriptor_s
 179 {
 180     u16                     i_stream_id;                        /* stream id */
 181     boolean_t               b_changed;    /* if stream has been changed,
 182                                              we have to inform the interface */
 183     vlc_mutex_t             stream_lock;  /* to be taken every time you read
 184                                            * or modify stream, pgrm or es    */
 185
 186     /* Input method data */
 187     int                     i_method;       /* input method for stream: file,
 188                                                disc or network */
 189     boolean_t               b_pace_control;    /* can we read when we want ? */
 190     boolean_t               b_seekable;               /* can we do lseek() ? */
 191
 192     /* if (b_seekable) : */
 193     int                     i_area_nb;
 194     input_area_t **         pp_areas;    /* list of areas in stream == offset
 195                                           * interval with own properties */
 196     input_area_t *          p_selected_area;
 197     input_area_t *          p_new_area;  /* Newly selected area from
 198                                           * the interface */
 199
 200     u32                     i_mux_rate; /* the rate we read the stream (in
 201                                          * units of 50 bytes/s) ; 0 if undef */
 202
 203     /* New status and rate requested by the interface */
 204     int                     i_new_status, i_new_rate;
 205     int                     b_new_mute;          /* int because it can be -1 */
 206     vlc_cond_t              stream_wait; /* interface -> input in case of a
 207                                           * status change request            */
 208
 209     /* Demultiplexer data */
 210     void *                  p_demux_data;
 211
 212     /* Programs descriptions */
 213     int                     i_pgrm_number;    /* size of the following array */
 214     pgrm_descriptor_t **    pp_programs;        /* array of pointers to pgrm */
 215
 216     /* ES descriptions */
 217     int                     i_es_number;
 218     es_descriptor_t **      pp_es;             /* carried elementary streams */
 219     int                     i_selected_es_number;
 220     es_descriptor_t **      pp_selected_es;             /* ES with a decoder */
 221     es_descriptor_t *       p_newly_selected_es;   /* ES selected from
 222                                                     * the interface */
 223     es_descriptor_t *       p_removed_es;   /* ES removed from the interface */
 224
 225
 226     /* Stream control */
 227     stream_ctrl_t           control;
 228
 229     /* Statistics */
 230     count_t                 c_packets_read;                  /* packets read */
 231     count_t                 c_packets_trashed;            /* trashed packets */
 232 } stream_descriptor_t;
 233
 234 #define MUTE_NO_CHANGE      -1
 235
 236 /*****************************************************************************
 237  * input_thread_t
 238  *****************************************************************************
 239  * This structure includes all the local static variables of an input thread
 240  *****************************************************************************/
 241 struct vout_thread_s;
 242 struct bit_stream_s;
 243
 244 typedef struct input_thread_s
 245 {
 246     /* Thread properties and locks */
 247     boolean_t               b_die;                             /* 'die' flag */
 248     boolean_t               b_error;
 249     boolean_t               b_eof;
 250     vlc_thread_t            thread_id;            /* id for thread functions */
 251     int *                   pi_status;              /* temporary status flag */
 252
 253     /* Input module */
 254     struct module_s *       p_input_module;
 255
 256     /* Init/End */
 257     void                 (* pf_init)( struct input_thread_s * );
 258     void                 (* pf_open)( struct input_thread_s * );
 259     void                 (* pf_close)( struct input_thread_s * );
 260     void                 (* pf_end)( struct input_thread_s * );
 261     void                 (* pf_init_bit_stream)( struct bit_stream_s *,
 262                               struct decoder_fifo_s *,
 263                 void (* pf_bitstream_callback)( struct bit_stream_s *,
 264                                                 boolean_t ),
 265                               void * );
 266
 267     /* Read & Demultiplex */
 268     int                  (* pf_read)( struct input_thread_s *,
 269                                       struct data_packet_s * pp_packets[] );
 270     void                 (* pf_demux)( struct input_thread_s *,
 271                                        struct data_packet_s * );
 272
 273     /* Packet management facilities */
 274     struct data_packet_s *(*pf_new_packet)( void *, size_t );
 275     struct pes_packet_s *(* pf_new_pes)( void * );
 276     void                 (* pf_delete_packet)( void *,
 277                                                struct data_packet_s * );
 278     void                 (* pf_delete_pes)( void *, struct pes_packet_s * );
 279
 280     /* Stream control capabilities */
 281     int                  (* pf_set_area)( struct input_thread_s *,
 282                                           struct input_area_s * );
 283     int                  (* pf_rewind)( struct input_thread_s * );
 284                                            /* NULL if we don't support going *
 285                                             * backwards (it's gonna be fun)  */
 286     void                 (* pf_seek)( struct input_thread_s *, off_t );
 287
 288     char *                  p_source;
 289
 290     int                     i_handle;           /* socket or file descriptor */
 291     FILE *                  p_stream;                       /* if applicable */
 292     int                     i_read_once;        /* number of packet read by
 293                                                  * pf_read once */
 294     void *                  p_method_data;     /* data of the packet manager */
 295     void *                  p_plugin_data;             /* data of the plugin */
 296
 297     /* General stream description */
 298     stream_descriptor_t     stream;                            /* PAT tables */
 299
 300     count_t                 c_loops;
 301 } input_thread_t;
 302
 303 /* Input methods */
 304 /* The first figure is a general method that can be used in interface plugins ;
 305  * The second figure is a detailed sub-method */
 306 #define INPUT_METHOD_NONE         0x0            /* input thread is inactive */
 307 #define INPUT_METHOD_FILE        0x10   /* stream is read from file p_source */
 308 #define INPUT_METHOD_DISC        0x20   /* stream is read directly from disc */
 309 #define INPUT_METHOD_DVD         0x21             /* stream is read from DVD */
 310 #define INPUT_METHOD_VCD         0x22             /* stream is read from VCD */
 311 #define INPUT_METHOD_NETWORK     0x30         /* stream is read from network */
 312 #define INPUT_METHOD_UCAST       0x31                         /* UDP unicast */
 313 #define INPUT_METHOD_MCAST       0x32                       /* UDP multicast */
 314 #define INPUT_METHOD_BCAST       0x33                       /* UDP broadcast */
 315 #define INPUT_METHOD_VLAN_BCAST  0x34            /* UDP broadcast with VLANs */
 316
 317
 318 /* Status changing methods */
 319 #define INPUT_STATUS_END            0
 320 #define INPUT_STATUS_PLAY           1
 321 #define INPUT_STATUS_PAUSE          2
 322 #define INPUT_STATUS_FASTER         3
 323 #define INPUT_STATUS_SLOWER         4
 324
 325 /*****************************************************************************
 326  * Prototypes
 327  *****************************************************************************/
 328 struct input_thread_s * input_CreateThread ( struct playlist_item_s *,
 329                                              int *pi_status );
 330 void input_DestroyThread( struct input_thread_s *, int *pi_status );
 331
 332 void input_SetStatus( struct input_thread_s *, int );
 333 void input_Seek     ( struct input_thread_s *, off_t );
 334 void input_DumpStream( struct input_thread_s * );
 335 char * input_OffsetToTime( struct input_thread_s *, char * psz_buffer, off_t );
 336 int  input_ChangeES ( struct input_thread_s *, struct es_descriptor_s *, u8 );
 337 int  input_ToggleES ( struct input_thread_s *,
 338                       struct es_descriptor_s *,
 339                       boolean_t );
 340 int  input_ChangeArea( struct input_thread_s *, struct input_area_s * );
 341 int  input_ToggleGrayscale( struct input_thread_s * );
 342 int  input_ToggleMute( struct input_thread_s * );
 343 int  input_SetSMP( struct input_thread_s *, int );
 344