Fix a bug in the output of para_audioc.
[paraslash.git] / filter.c
1 /*
2 * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file filter.c The stand-alone filter program. */
8
9 #include "para.h"
10
11 #include "filter.cmdline.h"
12 #include "list.h"
13 #include "sched.h"
14 #include "ggo.h"
15 #include "filter.h"
16 #include "string.h"
17 #include "stdin.h"
18 #include "stdout.h"
19 #include "error.h"
20
21 /** The list of all status items used by para_{server,audiod,gui}. */
22 const char *status_item_list[] = {STATUS_ITEM_ARRAY};
23
24 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
25
26 /** Initialize the array of errors for para_filter. */
27 INIT_FILTER_ERRLISTS;
28
29 /** The task that reads from stdin. */
30 static struct stdin_task stdin_task_struct;
31 /** pointer to the stdin task. */
32 static struct stdin_task *sit = &stdin_task_struct;
33
34 /** The task that filters the data. */
35 static struct filter_chain filter_chain_struct;
36 /** Pointer to the filter chain. */
37 static struct filter_chain *fc = &filter_chain_struct;
38
39 /** The task that writes converted data to stdout. */
40 static struct stdout_task stdout_task_struct;
41 /** Pointer to the stdout task. */
42 static struct stdout_task *sot = &stdout_task_struct;
43
44 /** Gengetopt struct that holds the command line args. */
45 static struct filter_args_info conf;
46
47 static int loglevel;
48 INIT_STDERR_LOGGING(loglevel);
49
50 static void open_filters(void)
51 {
52 int i;
53 struct filter_node *fn;
54
55 FOR_EACH_FILTER_NODE(fn, fc, i) {
56 struct filter *f = filters + fn->filter_num;
57 f->open(fn);
58 PARA_INFO_LOG("opened %s filter\n", f->name);
59 fc->outbufp = &fn->buf;
60 fc->out_loaded = &fn->loaded;
61 }
62 }
63
64 static int init_filter_chain(void)
65 {
66 int i, ret;
67 struct filter_node *fn;
68
69 if (!conf.filter_given)
70 return -E_NO_FILTERS;
71 fc->num_filters = conf.filter_given;
72 fc->filter_nodes = para_malloc(fc->num_filters * sizeof(struct filter_node));
73 fc->inbufp = &sit->buf;
74 fc->in_loaded = &sit->loaded;
75 fc->input_error = &sit->task.error;
76 fc->task.error = 0;
77 fc->output_error = &sot->task.error;
78 fc->task.pre_select = filter_pre_select;
79 sprintf(fc->task.status, "filter chain");
80
81 FOR_EACH_FILTER_NODE(fn, fc, i) {
82 char *fa = conf.filter_arg[i];
83 fn = fc->filter_nodes + i;
84 ret = check_filter_arg(fa, &fn->conf);
85 if (ret < 0)
86 goto err;
87 fn->filter_num = ret;
88 fn->fc = fc;
89 INIT_LIST_HEAD(&fn->callbacks);
90 PARA_DEBUG_LOG("filter #%d: %s\n", i, filters[fn->filter_num].name);
91 }
92 open_filters();
93 return 1;
94 err:
95 free(fc->filter_nodes);
96 return ret;
97 }
98
99 __noreturn static void print_help_and_die(void)
100 {
101 int d = conf.detailed_help_given;
102 const char **p = d? filter_args_info_detailed_help
103 : filter_args_info_help;
104
105 printf_or_die("%s\n\n", FILTER_CMDLINE_PARSER_PACKAGE "-"
106 FILTER_CMDLINE_PARSER_VERSION);
107 printf_or_die("%s\n\n", filter_args_info_usage);
108 for (; *p; p++)
109 printf_or_die("%s\n", *p);
110 print_filter_helps(d);
111 exit(0);
112 }
113
114 static int parse_config(int argc, char *argv[])
115 {
116 static char *cf; /* config file */
117 struct stat statbuf;
118
119 if (filter_cmdline_parser(argc, argv, &conf))
120 return -E_FILTER_SYNTAX;
121 HANDLE_VERSION_FLAG("filter", conf);
122 if (conf.help_given || conf.detailed_help_given)
123 print_help_and_die();
124 if (!cf) {
125 char *home = para_homedir();
126 cf = make_message("%s/.paraslash/filter.conf", home);
127 free(home);
128 }
129 if (!stat(cf, &statbuf)) {
130 struct filter_cmdline_parser_params params = {
131 .override = 0,
132 .initialize = 0,
133 .check_required = 0,
134 .check_ambiguity = 0
135 };
136 if (filter_cmdline_parser_config_file(cf, &conf, &params))
137 return -E_FILTER_SYNTAX;
138 }
139 return 1;
140 }
141
142 /**
143 * The main function of para_filter.
144 *
145 * Para_filter reads data from stdin, converts it by using a chain
146 * of filters (specified on the command line) and writes the resulting
147 * data to stdout.
148 *
149 * \param argc Number of command line options.
150 * \param argv Vector of arguments.
151 *
152 * \return \a EXIT_SUCCESS on success, EXIT_FAILURE on errors.
153 */
154 int main(int argc, char *argv[])
155 {
156 int ret;
157 static struct sched s;
158
159 stdin_set_defaults(sit);
160 sit->buf = para_malloc(sit->bufsize),
161
162 filter_init();
163 ret = parse_config(argc, argv);
164 if (ret < 0)
165 goto out;
166 loglevel = get_loglevel_by_name(conf.loglevel_arg);
167 ret = init_filter_chain();
168 if (ret < 0)
169 goto out;
170 sit->output_error = &fc->task.error;
171
172 stdout_set_defaults(sot);
173 sot->bufp = fc->outbufp;
174 sot->loaded = fc->out_loaded;
175 sot->input_error = &fc->task.error;
176
177 register_task(&sit->task);
178 register_task(&fc->task);
179 register_task(&sot->task);
180 s.default_timeout.tv_sec = 1;
181 s.default_timeout.tv_usec = 0;
182 ret = schedule(&s);
183 close_filters(fc);
184 out:
185 free(sit->buf);
186 if (ret < 0)
187 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
188 return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
189 }