Commit b593c2c4 authored by Rémi Denis-Courmont's avatar Rémi Denis-Courmont

Bandwidth limit access filter

parent ffe6a9a6
......@@ -1175,6 +1175,7 @@ VLC_ADD_PLUGINS([i420_rgb rawvideo blend scale image logo magnify puzzle colorth
VLC_ADD_PLUGINS([wav araw subtitle vobsub adpcm a52sys dtssys au ty voc xa nuv])
VLC_ADD_PLUGINS([access_directory access_file access_udp access_tcp])
VLC_ADD_PLUGINS([access_http access_mms access_ftp])
VLC_ADD_PLUGINS([access_filter_bandwidth])
VLC_ADD_PLUGINS([packetizer_mpegvideo packetizer_h264])
VLC_ADD_PLUGINS([packetizer_mpeg4video packetizer_mpeg4audio])
VLC_ADD_PLUGINS([packetizer_vc1])
......
SOURCES_access_filter_timeshift = timeshift.c
SOURCES_access_filter_record = record.c
SOURCES_access_filter_dump = dump.c
SOURCES_access_filter_bandwidth = bandwidth.c
/*****************************************************************************
* bandwidth.c
*****************************************************************************
* Copyright © 2007 Rémi Denis-Courmont
* $Id: dump.c 19948 2007-04-26 19:53:53Z courmisch $
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#include <vlc/vlc.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <errno.h>
#include <vlc_access.h>
#define BANDWIDTH_TEXT N_("Bandwidth limit (bytes/s)")
#define BANDWIDTH_LONGTEXT N_( \
"The bandwidth module will drop any data in excess of that many bytes " \
"per seconds." )
static int Open (vlc_object_t *);
static void Close (vlc_object_t *);
/* TODO: burst support */
vlc_module_begin ();
set_shortname (_("Bandwidth"));
set_description (_("Bandwidth limiter"));
set_category (CAT_INPUT);
set_subcategory (SUBCAT_INPUT_ACCESS_FILTER);
set_capability ("access_filter", 0);
add_shortcut ("bandwidth");
set_callbacks (Open, Close);
add_integer ("access-bandwidth", 65536, NULL, BANDWIDTH_TEXT,
BANDWIDTH_LONGTEXT, VLC_FALSE);
vlc_module_end();
static int Read (access_t *access, uint8_t *buffer, int len);
static int Seek (access_t *access, int64_t offset);
static int Control (access_t *access, int cmd, va_list ap);
struct access_sys_t
{
mtime_t last_time;
size_t last_size;
size_t bandwidth;
};
/**
* Open()
*/
static int Open (vlc_object_t *obj)
{
access_t *access = (access_t*)obj;
access_t *src = access->p_source;
if (src->pf_read != NULL)
access->pf_read = Read;
else
{
msg_Err (obj, "block bandwidth limit not implemented");
return VLC_EGENERIC;
}
if (src->pf_seek != NULL)
access->pf_seek = Seek;
access->pf_control = Control;
access->info = src->info;
access_sys_t *p_sys = access->p_sys = malloc (sizeof (*p_sys));
if (p_sys == NULL)
return VLC_ENOMEM;
memset (p_sys, 0, sizeof (*p_sys));
p_sys->bandwidth = var_CreateGetInteger (access, "access-bandwidth");
p_sys->last_time = mdate ();
msg_Dbg (obj, "bandwidth limit: %u bytes/s", p_sys->bandwidth);
return VLC_SUCCESS;
}
/**
* Close()
*/
static void Close (vlc_object_t *obj)
{
access_t *access = (access_t *)obj;
access_sys_t *p_sys = access->p_sys;
free (p_sys);
}
static int Read (access_t *access, uint8_t *buffer, int len)
{
access_t *src = access->p_source;
access_sys_t *p_sys = access->p_sys;
mtime_t now;
if (len == 0)
return 0;
retry:
now = mdate ();
if (now <= p_sys->last_time)
{
msg_Err (access, "*** ALERT *** System clock is going backward! ***");
return 0; /* Uho, your clock is broken. */
}
mtime_t delta = now - p_sys->last_time;
p_sys->last_time = now;
delta *= p_sys->bandwidth;
delta /= 1000000u;
if (delta == 0)
{
now += 1000000u / p_sys->bandwidth;
mwait (now);
goto retry;
}
if (len > delta)
{
msg_Dbg (access, "reading %u bytes instead of %u", (unsigned)delta,
len);
len = (int)delta;
}
src->info.i_update = access->info.i_update;
len = src->pf_read (src, buffer, len);
access->info = src->info;
msg_Dbg (access, "read %u bytes", len);
return len;
}
static int Control (access_t *access, int cmd, va_list ap)
{
access_t *src = access->p_source;
return src->pf_control (src, cmd, ap);
}
static int Seek (access_t *access, int64_t offset)
{
access_t *src = access->p_source;
src->info.i_update = access->info.i_update;
int ret = src->pf_seek (src, offset);
access->info = src->info;
return ret;
}
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