audiod: Fix time diff log message.
[paraslash.git] / prebuffer_filter.c
1 /*
2 * Copyright (C) 2009 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 prebuffer_close(fn);
78 t->error = -E_PREBUFFER_SUCCESS;
79 }
80
81 static int prebuffer_parse_config(int argc, char **argv, void **config)
82 {
83 struct prebuffer_filter_args_info *prebuffer_conf
84 = para_calloc(sizeof(*prebuffer_conf));
85 int ret = -E_PREBUFFER_SYNTAX;
86
87 if (prebuffer_cmdline_parser(argc, argv, prebuffer_conf))
88 goto err;
89 ret = -ERRNO_TO_PARA_ERROR(EINVAL);
90 if (prebuffer_conf->duration_arg < 0)
91 goto err;
92 if (prebuffer_conf->size_arg < 0)
93 goto err;
94 PARA_NOTICE_LOG("prebuffering %ims, %i bytes\n",
95 prebuffer_conf->duration_arg, prebuffer_conf->size_arg);
96 *config = prebuffer_conf;
97 return 1;
98 err:
99 free(prebuffer_conf);
100 return ret;
101 }
102
103 static void prebuffer_open(struct filter_node *fn)
104 {
105 struct private_prebuffer_data *ppd = para_calloc(sizeof(*ppd));
106
107 ppd->conf = fn->conf;
108 fn->private_data = ppd;
109 }
110
111 static void prebuffer_free_config(void *conf)
112 {
113 prebuffer_cmdline_parser_free(conf);
114 }
115
116 /**
117 * The init function of the prebuffer filter.
118 *
119 * \param f Pointer to the struct to initialize.
120 */
121 void prebuffer_filter_init(struct filter *f)
122 {
123 struct prebuffer_filter_args_info dummy;
124
125 prebuffer_cmdline_parser_init(&dummy);
126 f->open = prebuffer_open;
127 f->close = prebuffer_close;
128 f->parse_config = prebuffer_parse_config;
129 f->free_config = prebuffer_free_config;
130 f->pre_select = prebuffer_pre_select;
131 f->post_select = prebuffer_post_select;
132 f->help = (struct ggo_help) {
133 .short_help = prebuffer_filter_args_info_help,
134 .detailed_help = prebuffer_filter_args_info_detailed_help
135 };
136 }