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/* 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>
GstElementDetails gst_fdsrc_details = {
"Disk Source",
"Source/File",
"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_LOCATION,
ARG_BYTESPERREAD,
ARG_OFFSET,
};
static void gst_fdsrc_class_init (GstFdSrcClass *klass);
static void gst_fdsrc_init (GstFdSrc *fdsrc);
static void gst_fdsrc_set_arg (GtkObject *object, GtkArg *arg, guint id);
static void gst_fdsrc_get_arg (GtkObject *object, GtkArg *arg, guint id);
static GstBuffer * gst_fdsrc_get (GstPad *pad);
static GstElementClass *parent_class = NULL;
//static guint gst_fdsrc_signals[LAST_SIGNAL] = { 0 };
GtkType
gst_fdsrc_get_type (void)
{
static GtkType fdsrc_type = 0;
if (!fdsrc_type) {
static const GtkTypeInfo fdsrc_info = {
"GstFdSrc",
sizeof(GstFdSrc),
sizeof(GstFdSrcClass),
(GtkClassInitFunc)gst_fdsrc_class_init,
(GtkObjectInitFunc)gst_fdsrc_init,
(GtkArgSetFunc)gst_fdsrc_set_arg,
(GtkArgGetFunc)gst_fdsrc_get_arg,
(GtkClassInitFunc)NULL,
};
fdsrc_type = gtk_type_unique (GST_TYPE_ELEMENT, &fdsrc_info);
}
return fdsrc_type;
}
static void
gst_fdsrc_class_init (GstFdSrcClass *klass)
{
GtkObjectClass *gtkobject_class;
gtkobject_class = (GtkObjectClass*)klass;
parent_class = gtk_type_class(GST_TYPE_ELEMENT);
gtk_object_add_arg_type ("GstFdSrc::location", GST_TYPE_FILENAME,
GTK_ARG_WRITABLE, ARG_LOCATION);
gtk_object_add_arg_type ("GstFdSrc::bytesperread", GTK_TYPE_INT,
GTK_ARG_READWRITE, ARG_BYTESPERREAD);
gtk_object_add_arg_type ("GstFdSrc::offset", GTK_TYPE_INT,
GTK_ARG_READABLE, ARG_OFFSET);
gtkobject_class->set_arg = gst_fdsrc_set_arg;
gtkobject_class->get_arg = gst_fdsrc_get_arg;
}
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->bytes_per_read = 4096;
fdsrc->seq = 0;
}
static void
gst_fdsrc_set_arg (GtkObject *object, GtkArg *arg, guint id)
{
GstFdSrc *src;
int fd;
/* 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(id) {
case ARG_LOCATION:
/* the element must not be playing in order to do this */
g_return_if_fail (GST_STATE (src) < GST_STATE_PLAYING);
/* if we get a NULL, consider it to be a fd of 0 */
if (GTK_VALUE_STRING (*arg) == NULL) {
gst_element_set_state (GST_ELEMENT (object), GST_STATE_NULL);
src->fd = 0;
/* otherwise set the new filename */
} else {
if (sscanf (GTK_VALUE_STRING (*arg), "%d", &fd))
src->fd = fd;
}
break;
case ARG_BYTESPERREAD:
src->bytes_per_read = GTK_VALUE_INT (*arg);
break;
default:
break;
}
}
static void
gst_fdsrc_get_arg (GtkObject *object, GtkArg *arg, guint id)
{
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 (id) {
case ARG_BYTESPERREAD:
GTK_VALUE_INT (*arg) = src->bytes_per_read;
break;
case ARG_OFFSET:
GTK_VALUE_INT (*arg) = src->curoffset;
break;
default:
arg->type = GTK_TYPE_INVALID;
break;
}
}
static GstBuffer *
gst_fdsrc_get(GstPad *pad)
{
GstFdSrc *src;
GstBuffer *buf;
glong readbytes;
g_return_val_if_fail (pad != NULL, NULL);
src = GST_FDSRC(gst_pad_get_parent (pad));
/* create the buffer */
// FIXME: should eventually use a bufferpool for this
buf = gst_buffer_new ();
g_return_val_if_fail (buf, NULL);
/* allocate the space for the buffer data */
GST_BUFFER_DATA(buf) = g_malloc(src->bytes_per_read);
g_return_val_if_fail(GST_BUFFER_DATA(buf) != NULL, NULL);
/* read it in from the file */
readbytes = read(src->fd,GST_BUFFER_DATA(buf),src->bytes_per_read);
if (readbytes == 0) {
gst_element_signal_eos(GST_ELEMENT(src));
return NULL;
}
/* if we didn't get as many bytes as we asked for, we're at EOF */
if (readbytes < src->bytes_per_read) {
// set the buffer's EOF bit here
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_EOS);
}
GST_BUFFER_OFFSET(buf) = src->curoffset;
GST_BUFFER_SIZE(buf) = readbytes;
src->curoffset += readbytes;
/* we're done, return the buffer */
return buf;
}
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