src/input/demux_chained.c

   1 /*****************************************************************************
   2  * demux_chained.c
   3  *****************************************************************************
   4  * Copyright (C) 1999-2016 VLC authors and VideoLAN
   5  *
   6  * Authors: Laurent Aimar <fenrir _AT_ videolan _DOT_ org>
   7  *          Rémi Denis-Courmont
   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 #ifdef HAVE_CONFIG_H
  25 # include "config.h"
  26 #endif
  27
  28 #include <limits.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <vlc_common.h>
  32 #include <vlc_demux.h>
  33 #include "demux.h"
  34
  35 struct vlc_demux_chained_t
  36 {
  37     stream_t *fifo;
  38
  39     vlc_thread_t thread;
  40     vlc_mutex_t  lock;
  41
  42     struct
  43     {
  44         double  position;
  45         int64_t length;
  46         int64_t time;
  47     } stats;
  48
  49     es_out_t *out;
  50     char name[];
  51 };
  52
  53 static void *vlc_demux_chained_Thread(void *data)
  54 {
  55     vlc_demux_chained_t *dc = data;
  56     demux_t *demux = demux_NewAdvanced(dc->fifo, NULL, "", dc->name, "",
  57                                        dc->fifo, dc->out, false);
  58     if (demux == NULL)
  59     {
  60         vlc_stream_Delete(dc->fifo);
  61         return NULL;
  62     }
  63
  64     /* Stream FIFO cannot apply DVB filters.
  65      * Get all programs and let the E/S output sort them out. */
  66     demux_Control(demux, DEMUX_SET_GROUP, -1, NULL);
  67
  68     /* Main loop */
  69     mtime_t next_update = 0;
  70
  71     do
  72         if (demux_TestAndClearFlags(demux, UINT_MAX) || mdate() >= next_update)
  73         {
  74             double newpos;
  75             int64_t newlen, newtime;
  76
  77             if (demux_Control(demux, DEMUX_GET_POSITION, &newpos))
  78                 newpos = 0.;
  79             if (demux_Control(demux, DEMUX_GET_LENGTH, &newlen))
  80                 newlen = 0;
  81             if (demux_Control(demux, DEMUX_GET_TIME, &newtime))
  82                 newtime = 0;
  83
  84             vlc_mutex_lock(&dc->lock);
  85             dc->stats.position = newpos;
  86             dc->stats.length = newlen;
  87             dc->stats.time = newtime;
  88             vlc_mutex_unlock(&dc->lock);
  89
  90             next_update = mdate() + (CLOCK_FREQ / 4);
  91         }
  92     while (demux_Demux(demux) > 0);
  93
  94     demux_Delete(demux);
  95     return NULL;
  96 }
  97
  98 vlc_demux_chained_t *vlc_demux_chained_New(vlc_object_t *parent,
  99                                            const char *name, es_out_t *out)
 100 {
 101     vlc_demux_chained_t *dc = malloc(sizeof (*dc) + strlen(name) + 1);
 102     if (unlikely(dc == NULL))
 103         return NULL;
 104
 105     dc->fifo = vlc_stream_fifo_New(parent);
 106     if (dc->fifo == NULL)
 107     {
 108         free(dc);
 109         return NULL;
 110     }
 111
 112     dc->stats.position = 0.;
 113     dc->stats.length = 0;
 114     dc->stats.time = 0;
 115     dc->out = out;
 116     strcpy(dc->name, name);
 117
 118     vlc_mutex_init(&dc->lock);
 119
 120     if (vlc_clone(&dc->thread, vlc_demux_chained_Thread, dc,
 121                   VLC_THREAD_PRIORITY_INPUT))
 122     {
 123         vlc_stream_Delete(dc->fifo);
 124         vlc_stream_fifo_Close(dc->fifo);
 125         vlc_mutex_destroy(&dc->lock);
 126         free(dc);
 127         dc = NULL;
 128     }
 129     return dc;
 130 }
 131
 132 void vlc_demux_chained_Send(vlc_demux_chained_t *dc, block_t *block)
 133 {
 134     vlc_stream_fifo_Queue(dc->fifo, block);
 135 }
 136
 137 int vlc_demux_chained_ControlVa(vlc_demux_chained_t *dc, int query, va_list ap)
 138 {
 139     switch (query)
 140     {
 141         case DEMUX_GET_POSITION:
 142             vlc_mutex_lock(&dc->lock);
 143             *va_arg(ap, double *) = dc->stats.position;
 144             vlc_mutex_unlock(&dc->lock);
 145             break;
 146         case DEMUX_GET_LENGTH:
 147             vlc_mutex_lock(&dc->lock);
 148             *va_arg(ap, int64_t *) = dc->stats.length;
 149             vlc_mutex_unlock(&dc->lock);
 150             break;
 151         case DEMUX_GET_TIME:
 152             vlc_mutex_lock(&dc->lock);
 153             *va_arg(ap, int64_t *) = dc->stats.time;
 154             vlc_mutex_unlock(&dc->lock);
 155             break;
 156         default:
 157             return VLC_EGENERIC;
 158     }
 159     return VLC_SUCCESS;
 160 }
 161
 162 void vlc_demux_chained_Delete(vlc_demux_chained_t *dc)
 163 {
 164     vlc_stream_fifo_Close(dc->fifo);
 165     vlc_join(dc->thread, NULL);
 166     vlc_mutex_destroy(&dc->lock);
 167     free(dc);
 168 }