2 * Copyright (C) 2009 Andre Noll <maan@tuebingen.mpg.de>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file prebuffer_filter.c Paraslash's prebuffering filter. */
13 #include "filter_cmd.lsg.h"
16 #include "buffer_tree.h"
21 /** Data specific to the prebuffer filter. */
22 struct private_prebuffer_data {
23 /** Number of bytes prebuffered or -1 if no longer prebuffering. */
25 /** End of prebuffering period. */
26 struct timeval barrier;
29 static void prebuffer_pre_select(struct sched *s, void *context)
31 struct filter_node *fn = context;
32 struct btr_node *btrn = fn->btrn;
33 size_t iqs = btr_get_input_queue_size(btrn);
34 struct private_prebuffer_data *ppd = fn->private_data;
39 if (ppd->barrier.tv_sec == 0) {
40 uint32_t duration = FILTER_CMD_OPT_UINT32_VAL(PREBUFFER,
43 PARA_INFO_LOG("prebuffer period %" PRIu32 "ms\n", duration);
45 tv_add(&tv, now, &ppd->barrier);
47 if (tv_diff(&ppd->barrier, now, &diff) < 0)
48 return sched_min_delay(s);
49 sched_request_timeout(&diff, s);
52 static void prebuffer_close(struct filter_node *fn)
54 free(fn->private_data);
57 static int prebuffer_post_select(__a_unused struct sched *s, void *context)
59 struct filter_node *fn = context;
60 struct btr_node *btrn = fn->btrn;
61 size_t iqs = btr_get_input_queue_size(btrn);
62 struct private_prebuffer_data *ppd = fn->private_data;
63 uint32_t size = FILTER_CMD_OPT_UINT32_VAL(PREBUFFER, SIZE, fn->lpr);
65 if (ppd->barrier.tv_sec == 0)
67 if (tv_diff(now, &ppd->barrier, NULL) < 0)
71 btr_splice_out_node(&fn->btrn);
72 return -E_PREBUFFER_SUCCESS;
75 static void prebuffer_open(struct filter_node *fn)
77 struct private_prebuffer_data *ppd = para_calloc(sizeof(*ppd));
78 fn->private_data = ppd;
81 const struct filter lsg_filter_cmd_com_prebuffer_user_data = {
82 .open = prebuffer_open,
83 .close = prebuffer_close,
84 .pre_select = prebuffer_pre_select,
85 .post_select = prebuffer_post_select,