gstreamer/gst/elements/gstfdsrc.c
Christian Schaller 63a4cb67c2 commit the fdsrc fix from Pedro Corte-Real
Original commit message from CVS:
commit the fdsrc fix from Pedro Corte-Real
2002-11-28 14:13:51 +00:00

207 lines
5.2 KiB
C

/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gstfdsrc.c:
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <gstfdsrc.h>
#define DEFAULT_BLOCKSIZE 4096
GstElementDetails gst_fdsrc_details =
{
"Disk Source",
"Source/File",
"LGPL",
"Synchronous read from a file",
VERSION,
"Erik Walthinsen <omega@cse.ogi.edu>",
"(C) 1999",
};
/* FdSrc signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
ARG_FD,
ARG_BLOCKSIZE,
};
static void gst_fdsrc_class_init (GstFdSrcClass *klass);
static void gst_fdsrc_init (GstFdSrc *fdsrc);
static void gst_fdsrc_set_property (GObject *object, guint prop_id,
const GValue *value, GParamSpec *pspec);
static void gst_fdsrc_get_property (GObject *object, guint prop_id,
GValue *value, GParamSpec *pspec);
static GstBuffer * gst_fdsrc_get (GstPad *pad);
static GstElementClass *parent_class = NULL;
/*static guint gst_fdsrc_signals[LAST_SIGNAL] = { 0 };*/
GType
gst_fdsrc_get_type (void)
{
static GType fdsrc_type = 0;
if (!fdsrc_type) {
static const GTypeInfo fdsrc_info = {
sizeof(GstFdSrcClass),
NULL,
NULL,
(GClassInitFunc)gst_fdsrc_class_init,
NULL,
NULL,
sizeof(GstFdSrc),
0,
(GInstanceInitFunc)gst_fdsrc_init,
};
fdsrc_type = g_type_register_static (GST_TYPE_ELEMENT, "GstFdSrc", &fdsrc_info, 0);
}
return fdsrc_type;
}
static void
gst_fdsrc_class_init (GstFdSrcClass *klass)
{
GObjectClass *gobject_class;
gobject_class = (GObjectClass*)klass;
parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_FD,
g_param_spec_int ("fd", "fd", "An open file descriptor to read from",
0, G_MAXINT, 0, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BLOCKSIZE,
g_param_spec_ulong ("blocksize", "Block size", "Size in bytes to read per buffer",
1, G_MAXULONG, DEFAULT_BLOCKSIZE, G_PARAM_READWRITE));
gobject_class->set_property = gst_fdsrc_set_property;
gobject_class->get_property = gst_fdsrc_get_property;
}
static void gst_fdsrc_init(GstFdSrc *fdsrc) {
fdsrc->srcpad = gst_pad_new ("src", GST_PAD_SRC);
gst_pad_set_get_function (fdsrc->srcpad, gst_fdsrc_get);
gst_element_add_pad (GST_ELEMENT (fdsrc), fdsrc->srcpad);
fdsrc->fd = 0;
fdsrc->curoffset = 0;
fdsrc->blocksize = DEFAULT_BLOCKSIZE;
fdsrc->seq = 0;
}
static void
gst_fdsrc_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
GstFdSrc *src;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_FDSRC (object));
src = GST_FDSRC (object);
switch (prop_id) {
case ARG_FD:
src->fd = g_value_get_int (value);
break;
case ARG_BLOCKSIZE:
src->blocksize = g_value_get_ulong (value);
break;
default:
break;
}
}
static void
gst_fdsrc_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
GstFdSrc *src;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_FDSRC (object));
src = GST_FDSRC (object);
switch (prop_id) {
case ARG_BLOCKSIZE:
g_value_set_ulong (value, src->blocksize);
break;
case ARG_FD:
g_value_set_int (value, src->fd);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstBuffer *
gst_fdsrc_get(GstPad *pad)
{
GstFdSrc *src;
GstBuffer *buf;
glong readbytes;
src = GST_FDSRC (gst_pad_get_parent (pad));
/* create the buffer */
buf = gst_buffer_new_and_alloc (src->blocksize);
/* read it in from the file */
readbytes = read (src->fd, GST_BUFFER_DATA (buf), src->blocksize);
/* if nothing was read, we're in eos */
if (readbytes == 0) {
gst_element_set_eos (GST_ELEMENT (src));
return GST_BUFFER (gst_event_new (GST_EVENT_EOS));
}
if (readbytes == -1) {
g_error ("Error reading from file descriptor. Ending stream.\n");
gst_element_set_eos (GST_ELEMENT (src));
return GST_BUFFER (gst_event_new (GST_EVENT_EOS));
}
GST_BUFFER_OFFSET (buf) = src->curoffset;
GST_BUFFER_SIZE (buf) = readbytes;
GST_BUFFER_TIMESTAMP (buf) = GST_CLOCK_TIME_NONE;
src->curoffset += readbytes;
/* we're done, return the buffer */
return buf;
}