mirror of https://code.videolan.org/videolan/vlc
Bandwidth limit access filter
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@ -1175,6 +1175,7 @@ VLC_ADD_PLUGINS([i420_rgb rawvideo blend scale image logo magnify puzzle colorth
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VLC_ADD_PLUGINS([wav araw subtitle vobsub adpcm a52sys dtssys au ty voc xa nuv])
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VLC_ADD_PLUGINS([access_directory access_file access_udp access_tcp])
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VLC_ADD_PLUGINS([access_http access_mms access_ftp])
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VLC_ADD_PLUGINS([access_filter_bandwidth])
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VLC_ADD_PLUGINS([packetizer_mpegvideo packetizer_h264])
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VLC_ADD_PLUGINS([packetizer_mpeg4video packetizer_mpeg4audio])
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VLC_ADD_PLUGINS([packetizer_vc1])
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@ -1,3 +1,4 @@
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SOURCES_access_filter_timeshift = timeshift.c
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SOURCES_access_filter_record = record.c
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SOURCES_access_filter_dump = dump.c
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SOURCES_access_filter_bandwidth = bandwidth.c
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@ -0,0 +1,173 @@
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/*****************************************************************************
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* bandwidth.c
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*****************************************************************************
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* Copyright © 2007 Rémi Denis-Courmont
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* $Id: dump.c 19948 2007-04-26 19:53:53Z courmisch $
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#include <vlc/vlc.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <errno.h>
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#include <vlc_access.h>
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#define BANDWIDTH_TEXT N_("Bandwidth limit (bytes/s)")
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#define BANDWIDTH_LONGTEXT N_( \
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"The bandwidth module will drop any data in excess of that many bytes " \
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"per seconds." )
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static int Open (vlc_object_t *);
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static void Close (vlc_object_t *);
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/* TODO: burst support */
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vlc_module_begin ();
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set_shortname (_("Bandwidth"));
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set_description (_("Bandwidth limiter"));
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set_category (CAT_INPUT);
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set_subcategory (SUBCAT_INPUT_ACCESS_FILTER);
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set_capability ("access_filter", 0);
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add_shortcut ("bandwidth");
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set_callbacks (Open, Close);
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add_integer ("access-bandwidth", 65536, NULL, BANDWIDTH_TEXT,
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BANDWIDTH_LONGTEXT, VLC_FALSE);
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vlc_module_end();
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static int Read (access_t *access, uint8_t *buffer, int len);
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static int Seek (access_t *access, int64_t offset);
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static int Control (access_t *access, int cmd, va_list ap);
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struct access_sys_t
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{
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mtime_t last_time;
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size_t last_size;
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size_t bandwidth;
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};
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/**
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* Open()
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*/
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static int Open (vlc_object_t *obj)
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{
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access_t *access = (access_t*)obj;
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access_t *src = access->p_source;
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if (src->pf_read != NULL)
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access->pf_read = Read;
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else
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{
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msg_Err (obj, "block bandwidth limit not implemented");
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return VLC_EGENERIC;
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}
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if (src->pf_seek != NULL)
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access->pf_seek = Seek;
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access->pf_control = Control;
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access->info = src->info;
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access_sys_t *p_sys = access->p_sys = malloc (sizeof (*p_sys));
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if (p_sys == NULL)
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return VLC_ENOMEM;
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memset (p_sys, 0, sizeof (*p_sys));
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p_sys->bandwidth = var_CreateGetInteger (access, "access-bandwidth");
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p_sys->last_time = mdate ();
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msg_Dbg (obj, "bandwidth limit: %u bytes/s", p_sys->bandwidth);
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return VLC_SUCCESS;
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}
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/**
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* Close()
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*/
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static void Close (vlc_object_t *obj)
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{
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access_t *access = (access_t *)obj;
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access_sys_t *p_sys = access->p_sys;
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free (p_sys);
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}
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static int Read (access_t *access, uint8_t *buffer, int len)
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{
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access_t *src = access->p_source;
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access_sys_t *p_sys = access->p_sys;
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mtime_t now;
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if (len == 0)
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return 0;
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retry:
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now = mdate ();
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if (now <= p_sys->last_time)
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{
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msg_Err (access, "*** ALERT *** System clock is going backward! ***");
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return 0; /* Uho, your clock is broken. */
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}
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mtime_t delta = now - p_sys->last_time;
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p_sys->last_time = now;
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delta *= p_sys->bandwidth;
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delta /= 1000000u;
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if (delta == 0)
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{
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now += 1000000u / p_sys->bandwidth;
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mwait (now);
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goto retry;
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}
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if (len > delta)
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{
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msg_Dbg (access, "reading %u bytes instead of %u", (unsigned)delta,
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len);
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len = (int)delta;
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}
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src->info.i_update = access->info.i_update;
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len = src->pf_read (src, buffer, len);
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access->info = src->info;
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msg_Dbg (access, "read %u bytes", len);
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return len;
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}
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static int Control (access_t *access, int cmd, va_list ap)
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{
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access_t *src = access->p_source;
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return src->pf_control (src, cmd, ap);
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}
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static int Seek (access_t *access, int64_t offset)
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{
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access_t *src = access->p_source;
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src->info.i_update = access->info.i_update;
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int ret = src->pf_seek (src, offset);
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access->info = src->info;
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return ret;
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}
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