filter.c

   1 /* Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
   2
   3 /** \file filter.c The stand-alone filter program. */
   4
   5 #include <regex.h>
   6 #include <lopsub.h>
   7
   8 #include "filter.lsg.h"
   9 #include "filter_cmd.lsg.h"
  10 #include "para.h"
  11 #include "list.h"
  12 #include "lsu.h"
  13 #include "sched.h"
  14 #include "buffer_tree.h"
  15 #include "filter.h"
  16 #include "string.h"
  17 #include "stdin.h"
  18 #include "stdout.h"
  19 #include "error.h"
  20 #include "fd.h"
  21 #include "version.h"
  22
  23 /** Array of error strings. */
  24 DEFINE_PARA_ERRLIST;
  25 static struct lls_parse_result *lpr; /* command line options */
  26
  27 #define CMD_PTR (lls_cmd(0, filter_suite))
  28 #define OPT_RESULT(_name) \
  29         (lls_opt_result(LSG_FILTER_PARA_FILTER_OPT_ ## _name, lpr))
  30 #define OPT_GIVEN(_name) (lls_opt_given(OPT_RESULT(_name)))
  31 #define OPT_UINT32_VAL(_name) (lls_uint32_val(0, OPT_RESULT(_name)))
  32
  33 /** The list of all status items used by para_{server,audiod,gui}. */
  34 const char *status_item_list[] = {STATUS_ITEMS};
  35
  36 /**
  37  * Dummy version which only contains NULL pointers.
  38  *
  39  * This is used by the amp filter which first tries to obtain the amplification
  40  * value from an element in this array.
  41  */
  42 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
  43
  44 /** The task that reads from stdin. */
  45 static struct stdin_task stdin_task_struct;
  46 /** pointer to the stdin task. */
  47 static struct stdin_task *sit = &stdin_task_struct;
  48
  49 /** The task that writes converted data to stdout. */
  50 static struct stdout_task stdout_task_struct;
  51 /** Pointer to the stdout task. */
  52 static struct stdout_task *sot = &stdout_task_struct;
  53
  54 static int loglevel;
  55 INIT_STDERR_LOGGING(loglevel);
  56
  57 static void handle_help_flag(void)
  58 {
  59         char *help;
  60
  61         if (OPT_GIVEN(DETAILED_HELP))
  62                 help = lls_long_help(CMD_PTR);
  63         else if (OPT_GIVEN(HELP))
  64                 help = lls_short_help(CMD_PTR);
  65         else
  66                 return;
  67         printf("%s\n", help);
  68         free(help);
  69         print_filter_helps(OPT_GIVEN(DETAILED_HELP));
  70         exit(EXIT_SUCCESS);
  71 }
  72
  73 static int parse_config(void)
  74 {
  75         int ret;
  76
  77         version_handle_flag("filter", OPT_GIVEN(VERSION));
  78         handle_help_flag();
  79         ret = lsu_merge_config_file_options(NULL, "filter.conf",
  80                 &lpr, CMD_PTR, filter_suite, 0 /* default flags */);
  81         if (ret < 0)
  82                 return ret;
  83         loglevel = OPT_UINT32_VAL(LOGLEVEL);
  84         if (!OPT_GIVEN(FILTER)) {
  85                 print_filter_list();
  86                 exit(EXIT_SUCCESS);
  87         }
  88         return 1;
  89 }
  90
  91 /**
  92  * The main function of para_filter.
  93  *
  94  * Para_filter reads data from stdin, converts it by using a chain
  95  * of filters (specified on the command line) and writes the resulting
  96  * data to stdout.
  97  *
  98  * \param argc Number of command line options.
  99  * \param argv Vector of arguments.
 100  *
 101  * \return \a EXIT_SUCCESS on success, EXIT_FAILURE on errors.
 102  */
 103 int main(int argc, char *argv[])
 104 {
 105         static struct sched s;
 106         int i, ret;
 107         const struct filter *f;
 108         struct btr_node *parent;
 109         struct filter_node **fns;
 110         struct lls_parse_result *filter_lpr; /* per-filter options */
 111         char *errctx;
 112
 113         ret = lls(lls_parse(argc, argv, CMD_PTR, &lpr, &errctx));
 114         if (ret < 0)
 115                 goto out;
 116         ret = parse_config();
 117         if (ret < 0)
 118                 goto free_lpr;
 119         sit->btrn = btr_new_node(&(struct btr_node_description)
 120                 EMBRACE(.name = "stdin"));
 121         stdin_task_register(sit, &s);
 122
 123         fns = para_malloc(OPT_GIVEN(FILTER) * sizeof(*fns));
 124         for (i = 0, parent = sit->btrn; i < OPT_GIVEN(FILTER); i++) {
 125                 const char *fa = lls_string_val(i, OPT_RESULT(FILTER));
 126                 const char *name;
 127                 struct filter_node *fn;
 128                 struct task_info ti;
 129
 130                 fn = fns[i] = para_calloc(sizeof(*fn));
 131                 fn->filter_num = filter_setup(fa, &fn->conf, &filter_lpr);
 132                 name = filter_name(fn->filter_num);
 133                 fn->lpr = filter_lpr;
 134                 PARA_DEBUG_LOG("filter #%d: %s\n", i, name);
 135                 f = filter_get(fn->filter_num);
 136                 fn->btrn = btr_new_node(&(struct btr_node_description)
 137                         EMBRACE(.name = name, .parent = parent,
 138                         .handler = f->execute, .context = fn));
 139                 ti.name = name;
 140                 ti.pre_select = f->pre_select;
 141                 ti.post_select = f->post_select;
 142                 ti.context = fn;
 143                 if (f->open)
 144                         f->open(fn);
 145                 fn->task = task_register(&ti, &s);
 146                 parent = fn->btrn;
 147         }
 148         sot->btrn = btr_new_node(&(struct btr_node_description)
 149                 EMBRACE(.name = "stdout", .parent = parent));
 150         stdout_task_register(sot, &s);
 151
 152         s.default_timeout.tv_sec = 1;
 153         s.default_timeout.tv_usec = 0;
 154         btr_log_tree(sit->btrn, LL_INFO);
 155         ret = schedule(&s);
 156         sched_shutdown(&s);
 157         for (i--; i >= 0; i--) {
 158                 struct filter_node *fn = fns[i];
 159
 160                 f = filter_get(fn->filter_num);
 161                 if (f->close)
 162                         f->close(fn);
 163                 btr_remove_node(&fn->btrn);
 164                 if (f->teardown)
 165                         f->teardown(fn->lpr, fn->conf);
 166                 free(fn);
 167         }
 168         free(fns);
 169         btr_remove_node(&sit->btrn);
 170         btr_remove_node(&sot->btrn);
 171 free_lpr:
 172         lls_free_parse_result(lpr, CMD_PTR);
 173 out:
 174         if (ret < 0) {
 175                 if (errctx)
 176                         PARA_ERROR_LOG("%s\n", errctx);
 177                 free(errctx);
 178                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 179         }
 180         exit(ret < 0? EXIT_FAILURE : EXIT_SUCCESS);
 181 }