--- /dev/null
+/*****************************************************************************
+ * 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;
+}