2 * Copyright (C) 2009 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file prebuffer_filter.c Paraslash's prebuffering filter. */
13 #include "prebuffer_filter.cmdline.h"
17 #include "buffer_tree.h"
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. */
28 /** End of prebuffering period. */
29 struct timeval barrier;
32 static ssize_t prebuffer_convert(char *inbuf, size_t inbuf_len,
33 struct filter_node *fn)
35 struct private_prebuffer_data *ppd = fn->private_data;
36 struct prebuffer_filter_args_info *conf = ppd->conf;
39 if (*fn->fc->input_error < 0 && ppd->prebuffered >= 0)
43 if (ppd->prebuffered < 0) {
44 size_t copy = PARA_MIN(inbuf_len, fn->bufsize - fn->loaded);
45 memcpy(fn->buf + fn->loaded, inbuf, copy);
49 if (ppd->prebuffered + inbuf_len > fn->bufsize) {
50 fn->bufsize = PARA_MAX(2 * fn->bufsize,
51 ppd->prebuffered + inbuf_len);
52 fn->buf = para_realloc(fn->buf, fn->bufsize);
54 memcpy(fn->buf + ppd->prebuffered, inbuf, inbuf_len);
55 if (ppd->prebuffered == 0) {
57 PARA_INFO_LOG("prebuffer period %dms\n",
59 ms2tv(conf->duration_arg, &tv);
60 tv_add(&tv, now, &ppd->barrier);
62 ppd->prebuffered += inbuf_len;
63 PARA_DEBUG_LOG("%d bytes prebuffered\n", ppd->prebuffered);
64 if (*fn->fc->input_error >= 0) {
66 if (tv_diff(now, &ppd->barrier, &diff) < 0)
68 if (ppd->prebuffered < conf->size_arg)
72 fn->loaded = ppd->prebuffered;
73 ppd->prebuffered = -1;
78 static void prebuffer_close(struct filter_node *fn)
80 free(fn->private_data);
84 static int prebuffer_parse_config(int argc, char **argv, void **config)
86 struct prebuffer_filter_args_info *prebuffer_conf
87 = para_calloc(sizeof(*prebuffer_conf));
88 int ret = -E_PREBUFFER_SYNTAX;
90 if (prebuffer_cmdline_parser(argc, argv, prebuffer_conf))
92 ret = -ERRNO_TO_PARA_ERROR(EINVAL);
93 if (prebuffer_conf->duration_arg < 0)
95 if (prebuffer_conf->size_arg < 0)
97 PARA_NOTICE_LOG("prebuffering %ims, %i bytes\n",
98 prebuffer_conf->duration_arg, prebuffer_conf->size_arg);
99 *config = prebuffer_conf;
102 free(prebuffer_conf);
106 static void prebuffer_open(struct filter_node *fn)
108 struct private_prebuffer_data *ppd = para_calloc(sizeof(*ppd));
110 ppd->conf = fn->conf;
111 fn->private_data = ppd;
112 fn->bufsize = 8192; /* gets increased on demand */
113 fn->buf = para_malloc(fn->bufsize);
117 * The init function of the prebuffer filter.
119 * \param f Pointer to the struct to initialize.
121 void prebuffer_filter_init(struct filter *f)
123 struct prebuffer_filter_args_info dummy;
125 prebuffer_cmdline_parser_init(&dummy);
126 f->open = prebuffer_open;
127 f->close = prebuffer_close;
128 f->convert = prebuffer_convert;
129 f->parse_config = prebuffer_parse_config;
130 f->help = (struct ggo_help) {
131 .short_help = prebuffer_filter_args_info_help,
132 .detailed_help = prebuffer_filter_args_info_detailed_help