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. */
12 #include "prebuffer_filter.cmdline.h"
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. */
26 /** End of prebuffering period. */
27 struct timeval barrier;
30 static ssize_t prebuffer_convert(char *inbuf, size_t inbuf_len,
31 struct filter_node *fn)
33 struct private_prebuffer_data *ppd = fn->private_data;
34 struct prebuffer_filter_args_info *conf = ppd->conf;
37 if (*fn->fc->input_error < 0 && ppd->prebuffered >= 0)
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);
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);
52 memcpy(fn->buf + ppd->prebuffered, inbuf, inbuf_len);
53 if (ppd->prebuffered == 0) {
55 PARA_INFO_LOG("prebuffer period %dms\n",
57 ms2tv(conf->duration_arg, &tv);
58 tv_add(&tv, now, &ppd->barrier);
60 ppd->prebuffered += inbuf_len;
61 PARA_DEBUG_LOG("%d bytes prebuffered\n", ppd->prebuffered);
62 if (*fn->fc->input_error >= 0) {
64 if (tv_diff(now, &ppd->barrier, &diff) < 0)
66 if (ppd->prebuffered < conf->size_arg)
70 fn->loaded = ppd->prebuffered;
71 ppd->prebuffered = -1;
76 static void prebuffer_close(struct filter_node *fn)
78 free(fn->private_data);
82 static int prebuffer_parse_config(int argc, char **argv, void **config)
84 struct prebuffer_filter_args_info *prebuffer_conf
85 = para_calloc(sizeof(*prebuffer_conf));
86 int ret = -E_PREBUFFER_SYNTAX;
88 if (prebuffer_cmdline_parser(argc, argv, prebuffer_conf))
90 ret = -ERRNO_TO_PARA_ERROR(EINVAL);
91 if (prebuffer_conf->duration_arg < 0)
93 if (prebuffer_conf->size_arg < 0)
95 PARA_NOTICE_LOG("prebuffering %ims, %i bytes\n",
96 prebuffer_conf->duration_arg, prebuffer_conf->size_arg);
97 *config = prebuffer_conf;
100 free(prebuffer_conf);
104 static void prebuffer_open(struct filter_node *fn)
106 struct private_prebuffer_data *ppd = para_calloc(sizeof(*ppd));
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);
115 * The init function of the prebuffer filter.
117 * \param f Pointer to the struct to initialize.
119 void prebuffer_filter_init(struct filter *f)
121 struct prebuffer_filter_args_info dummy;
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