Introduce LIST_HEAD macro and use it in audiod_command.
[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
11 #include "para.h"
12 #include "prebuffer_filter.cmdline.h"
13 #include "list.h"
14 #include "sched.h"
15 #include "ggo.h"
16 #include "filter.h"
17 #include "string.h"
18 #include "error.h"
19
20 /** Data specific to the prebuffer filter. */
21 struct private_prebuffer_data {
22 /** The configuration data for this instance of the filter. */
23 struct prebuffer_filter_args_info *conf;
24 /** Number of bytes prebuffered or -1 if no longer prebuffering. */
25 int prebuffered;
26 /** End of prebuffering period. */
27 struct timeval barrier;
28 };
29
30 static ssize_t prebuffer_convert(char *inbuf, size_t inbuf_len,
31 struct filter_node *fn)
32 {
33 struct private_prebuffer_data *ppd = fn->private_data;
34 struct prebuffer_filter_args_info *conf = ppd->conf;
35
36 if (inbuf_len == 0) {
37 if (*fn->fc->input_error < 0 && ppd->prebuffered >= 0)
38 goto prebuffer_end;
39 return 0;
40 }
41 if (ppd->prebuffered < 0) {
42 size_t copy = PARA_MIN(inbuf_len, fn->bufsize - fn->loaded);
43 memcpy(fn->buf + fn->loaded, inbuf, copy);
44 fn->loaded += copy;
45 return copy;
46 }
47 if (ppd->prebuffered + inbuf_len > fn->bufsize) {
48 fn->bufsize = PARA_MAX(2 * fn->bufsize,
49 ppd->prebuffered + inbuf_len);
50 fn->buf = para_realloc(fn->buf, fn->bufsize);
51 }
52 memcpy(fn->buf + ppd->prebuffered, inbuf, inbuf_len);
53 if (ppd->prebuffered == 0) {
54 struct timeval tv;
55 PARA_INFO_LOG("prebuffer period %dms\n",
56 conf->duration_arg);
57 ms2tv(conf->duration_arg, &tv);
58 tv_add(&tv, now, &ppd->barrier);
59 }
60 ppd->prebuffered += inbuf_len;
61 PARA_DEBUG_LOG("%d bytes prebuffered\n", ppd->prebuffered);
62 if (*fn->fc->input_error >= 0) {
63 struct timeval diff;
64 if (tv_diff(now, &ppd->barrier, &diff) < 0)
65 goto out;
66 if (ppd->prebuffered < conf->size_arg)
67 goto out;
68 }
69 prebuffer_end:
70 fn->loaded = ppd->prebuffered;
71 ppd->prebuffered = -1;
72 out:
73 return inbuf_len;
74 }
75
76 static void prebuffer_close(struct filter_node *fn)
77 {
78 free(fn->private_data);
79 free(fn->buf);
80 }
81
82 static int prebuffer_parse_config(int argc, char **argv, void **config)
83 {
84 struct prebuffer_filter_args_info *prebuffer_conf
85 = para_calloc(sizeof(*prebuffer_conf));
86 int ret = -E_PREBUFFER_SYNTAX;
87
88 if (prebuffer_cmdline_parser(argc, argv, prebuffer_conf))
89 goto err;
90 ret = -ERRNO_TO_PARA_ERROR(EINVAL);
91 if (prebuffer_conf->duration_arg < 0)
92 goto err;
93 if (prebuffer_conf->size_arg < 0)
94 goto err;
95 PARA_NOTICE_LOG("prebuffering %ims, %i bytes\n",
96 prebuffer_conf->duration_arg, prebuffer_conf->size_arg);
97 *config = prebuffer_conf;
98 return 1;
99 err:
100 free(prebuffer_conf);
101 return ret;
102 }
103
104 static void prebuffer_open(struct filter_node *fn)
105 {
106 struct private_prebuffer_data *ppd = para_calloc(sizeof(*ppd));
107
108 ppd->conf = fn->conf;
109 fn->private_data = ppd;
110 fn->bufsize = 8192; /* gets increased on demand */
111 fn->buf = para_malloc(fn->bufsize);
112 }
113
114 /**
115 * The init function of the prebuffer filter.
116 *
117 * \param f Pointer to the struct to initialize.
118 */
119 void prebuffer_filter_init(struct filter *f)
120 {
121 struct prebuffer_filter_args_info dummy;
122
123 prebuffer_cmdline_parser_init(&dummy);
124 f->open = prebuffer_open;
125 f->close = prebuffer_close;
126 f->convert = prebuffer_convert;
127 f->parse_config = prebuffer_parse_config;
128 f->help = (struct ggo_help) {
129 .short_help = prebuffer_filter_args_info_help,
130 .detailed_help = prebuffer_filter_args_info_detailed_help
131 };
132 }