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[paraslash.git] / prebuffer_filter.c
1 /*
2 * Copyright (C) 2009-2011 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file prebuffer_filter.c Paraslash's prebuffering filter. */
8
9 #include <regex.h>
10 #include <stdbool.h>
11
12 #include "para.h"
13 #include "prebuffer_filter.cmdline.h"
14 #include "list.h"
15 #include "sched.h"
16 #include "ggo.h"
17 #include "buffer_tree.h"
18 #include "filter.h"
19 #include "string.h"
20 #include "error.h"
21
22 /** Data specific to the prebuffer filter. */
23 struct private_prebuffer_data {
24 /** The configuration data for this instance of the filter. */
25 struct prebuffer_filter_args_info *conf;
26 /** Number of bytes prebuffered or -1 if no longer prebuffering. */
27 int prebuffered;
28 /** End of prebuffering period. */
29 struct timeval barrier;
30 };
31
32 static void prebuffer_pre_select(struct sched *s, struct task *t)
33 {
34 struct filter_node *fn = container_of(t, struct filter_node, task);
35 struct btr_node *btrn = fn->btrn;
36 size_t iqs = btr_get_input_queue_size(btrn);
37 struct private_prebuffer_data *ppd = fn->private_data;
38 struct prebuffer_filter_args_info *conf = ppd->conf;
39 struct timeval diff;
40
41 t->error = 0;
42 if (iqs == 0)
43 return;
44 if (ppd->barrier.tv_sec == 0) {
45 struct timeval tv;
46 PARA_INFO_LOG("prebuffer period %dms\n",
47 conf->duration_arg);
48 ms2tv(conf->duration_arg, &tv);
49 tv_add(&tv, now, &ppd->barrier);
50 }
51 if (tv_diff(&ppd->barrier, now, &diff) < 0)
52 return sched_min_delay(s);
53 sched_request_timeout(&diff, s);
54 }
55
56 static void prebuffer_close(struct filter_node *fn)
57 {
58 free(fn->private_data);
59 }
60
61 static void prebuffer_post_select(__a_unused struct sched *s, struct task *t)
62 {
63 struct filter_node *fn = container_of(t, struct filter_node, task);
64 struct btr_node *btrn = fn->btrn;
65 size_t iqs = btr_get_input_queue_size(btrn);
66 struct private_prebuffer_data *ppd = fn->private_data;
67 struct prebuffer_filter_args_info *conf = ppd->conf;
68
69 t->error = 0;
70 if (ppd->barrier.tv_sec == 0)
71 return;
72 if (tv_diff(now, &ppd->barrier, NULL) < 0)
73 return;
74 if (iqs < conf->size_arg)
75 return;
76 btr_splice_out_node(btrn);
77 t->error = -E_PREBUFFER_SUCCESS;
78 }
79
80 static int prebuffer_parse_config(int argc, char **argv, void **config)
81 {
82 struct prebuffer_filter_args_info *prebuffer_conf
83 = para_calloc(sizeof(*prebuffer_conf));
84 int ret = -E_PREBUFFER_SYNTAX;
85
86 if (prebuffer_cmdline_parser(argc, argv, prebuffer_conf))
87 goto err;
88 ret = -ERRNO_TO_PARA_ERROR(EINVAL);
89 if (prebuffer_conf->duration_arg < 0)
90 goto err;
91 if (prebuffer_conf->size_arg < 0)
92 goto err;
93 PARA_NOTICE_LOG("prebuffering %ims, %i bytes\n",
94 prebuffer_conf->duration_arg, prebuffer_conf->size_arg);
95 *config = prebuffer_conf;
96 return 1;
97 err:
98 free(prebuffer_conf);
99 return ret;
100 }
101
102 static void prebuffer_open(struct filter_node *fn)
103 {
104 struct private_prebuffer_data *ppd = para_calloc(sizeof(*ppd));
105
106 ppd->conf = fn->conf;
107 fn->private_data = ppd;
108 }
109
110 static void prebuffer_free_config(void *conf)
111 {
112 prebuffer_cmdline_parser_free(conf);
113 }
114
115 /**
116 * The init function of the prebuffer filter.
117 *
118 * \param f Pointer to the struct to initialize.
119 */
120 void prebuffer_filter_init(struct filter *f)
121 {
122 struct prebuffer_filter_args_info dummy;
123
124 prebuffer_cmdline_parser_init(&dummy);
125 f->open = prebuffer_open;
126 f->close = prebuffer_close;
127 f->parse_config = prebuffer_parse_config;
128 f->free_config = prebuffer_free_config;
129 f->pre_select = prebuffer_pre_select;
130 f->post_select = prebuffer_post_select;
131 f->help = (struct ggo_help) {
132 .short_help = prebuffer_filter_args_info_help,
133 .detailed_help = prebuffer_filter_args_info_detailed_help
134 };
135 }