gstreamer/plugins/elements/gstdisksrc.c

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/* Gnome-Streamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* 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 <unistd.h>
//#define DEBUG_ENABLED
#include <gstdisksrc.h>
GstElementDetails gst_disksrc_details = {
"Disk Source",
"Source/File",
"Synchronous read from a file",
VERSION,
"Erik Walthinsen <omega@cse.ogi.edu>",
"(C) 1999",
};
/* DiskSrc signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
ARG_LOCATION,
ARG_BYTESPERREAD,
ARG_OFFSET,
ARG_SIZE,
};
static void gst_disksrc_class_init (GstDiskSrcClass *klass);
static void gst_disksrc_init (GstDiskSrc *disksrc);
static void gst_disksrc_set_arg (GtkObject *object, GtkArg *arg, guint id);
static void gst_disksrc_get_arg (GtkObject *object, GtkArg *arg, guint id);
static void gst_disksrc_close_file (GstDiskSrc *src);
static void gst_disksrc_push (GstSrc *src);
static GstElementStateReturn gst_disksrc_change_state (GstElement *element);
static GstSrcClass *parent_class = NULL;
//static guint gst_disksrc_signals[LAST_SIGNAL] = { 0 };
GtkType
gst_disksrc_get_type(void) {
static GtkType disksrc_type = 0;
if (!disksrc_type) {
static const GtkTypeInfo disksrc_info = {
"GstDiskSrc",
sizeof(GstDiskSrc),
sizeof(GstDiskSrcClass),
(GtkClassInitFunc)gst_disksrc_class_init,
(GtkObjectInitFunc)gst_disksrc_init,
(GtkArgSetFunc)gst_disksrc_set_arg,
(GtkArgGetFunc)gst_disksrc_get_arg,
(GtkClassInitFunc)NULL,
};
disksrc_type = gtk_type_unique(GST_TYPE_SRC,&disksrc_info);
}
return disksrc_type;
}
static void
gst_disksrc_class_init (GstDiskSrcClass *klass)
{
GtkObjectClass *gtkobject_class;
GstElementClass *gstelement_class;
GstSrcClass *gstsrc_class;
gtkobject_class = (GtkObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
gstsrc_class = (GstSrcClass*)klass;
parent_class = gtk_type_class (GST_TYPE_SRC);
gtk_object_add_arg_type ("GstDiskSrc::location", GST_TYPE_FILENAME,
GTK_ARG_READWRITE, ARG_LOCATION);
gtk_object_add_arg_type ("GstDiskSrc::bytesperread", GTK_TYPE_INT,
GTK_ARG_READWRITE, ARG_BYTESPERREAD);
gtk_object_add_arg_type ("GstDiskSrc::offset", GTK_TYPE_INT,
GTK_ARG_READABLE, ARG_OFFSET);
gtk_object_add_arg_type ("GstDiskSrc::size", GTK_TYPE_INT,
GTK_ARG_READABLE, ARG_SIZE);
gtkobject_class->set_arg = gst_disksrc_set_arg;
gtkobject_class->get_arg = gst_disksrc_get_arg;
gstelement_class->change_state = gst_disksrc_change_state;
gstsrc_class->push = gst_disksrc_push;
/* we nominally can't (won't) do async */
gstsrc_class->push_region = NULL;
}
static void
gst_disksrc_init (GstDiskSrc *disksrc)
{
disksrc->srcpad = gst_pad_new ("src", GST_PAD_SRC);
gst_element_add_pad (GST_ELEMENT (disksrc), disksrc->srcpad);
disksrc->filename = NULL;
disksrc->fd = 0;
disksrc->curoffset = 0;
disksrc->bytes_per_read = 4096;
disksrc->seq = 0;
disksrc->size = 0;
disksrc->new_seek = FALSE;
}
static void
gst_disksrc_set_arg (GtkObject *object, GtkArg *arg, guint id)
{
GstDiskSrc *src;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_DISKSRC (object));
src = GST_DISKSRC (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 (src->filename) g_free (src->filename);
/* clear the filename if we get a NULL (is that possible?) */
if (GTK_VALUE_STRING (*arg) == NULL) {
gst_element_set_state (GST_ELEMENT (object), GST_STATE_NULL);
src->filename = NULL;
/* otherwise set the new filename */
} else {
src->filename = g_strdup (GTK_VALUE_STRING (*arg));
}
break;
case ARG_BYTESPERREAD:
src->bytes_per_read = GTK_VALUE_INT (*arg);
break;
/*
case ARG_OFFSET:
src->curoffset = GTK_VALUE_INT(*arg);
lseek(src->fd,src->curoffset, SEEK_SET);
src->new_seek = TRUE;
break;
*/
default:
break;
}
}
static void
gst_disksrc_get_arg (GtkObject *object, GtkArg *arg, guint id)
{
GstDiskSrc *src;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_DISKSRC (object));
src = GST_DISKSRC (object);
switch (id) {
case ARG_LOCATION:
GTK_VALUE_STRING (*arg) = src->filename;
break;
case ARG_BYTESPERREAD:
GTK_VALUE_INT (*arg) = src->bytes_per_read;
break;
case ARG_OFFSET:
GTK_VALUE_INT (*arg) = src->curoffset;
break;
case ARG_SIZE:
GTK_VALUE_INT (*arg) = src->size;
break;
default:
arg->type = GTK_TYPE_INVALID;
break;
}
}
static void
gst_disksrc_push (GstSrc *src)
{
GstDiskSrc *disksrc;
GstBuffer *buf;
glong readbytes;
g_return_if_fail (src != NULL);
g_return_if_fail (GST_IS_DISKSRC (src));
g_return_if_fail (GST_FLAG_IS_SET (src, GST_DISKSRC_OPEN));
g_return_if_fail (GST_STATE (src) >= GST_STATE_READY);
disksrc = GST_DISKSRC (src);
/* create the buffer */
// FIXME: should eventually use a bufferpool for this
buf = gst_buffer_new ();
g_return_if_fail (buf);
/* allocate the space for the buffer data */
GST_BUFFER_DATA (buf) = g_malloc (disksrc->bytes_per_read);
g_return_if_fail (GST_BUFFER_DATA (buf) != NULL);
/* read it in from the file */
readbytes = read (disksrc->fd, GST_BUFFER_DATA (buf), disksrc->bytes_per_read);
if (readbytes == -1) {
perror ("read()");
gst_buffer_unref (buf);
return;
}
else if (readbytes == 0) {
gst_src_signal_eos (GST_SRC (disksrc));
gst_buffer_unref (buf);
return;
}
/* if we didn't get as many bytes as we asked for, we're at EOF */
if (readbytes < disksrc->bytes_per_read)
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_EOS);
/* if we have a new buffer froma seek, mark it */
if (disksrc->new_seek) {
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLUSH);
disksrc->new_seek = FALSE;
}
GST_BUFFER_OFFSET (buf) = disksrc->curoffset;
GST_BUFFER_SIZE (buf) = readbytes;
disksrc->curoffset += readbytes;
DEBUG("pushing with offset %d\n", GST_BUFFER_OFFSET (buf));
/* we're done, push the buffer off now */
gst_pad_push (disksrc->srcpad, buf);
DEBUG("pushing with offset %d done\n", GST_BUFFER_OFFSET (buf));
}
/* open the file, necessary to go to RUNNING state */
static gboolean
gst_disksrc_open_file (GstDiskSrc *src)
{
struct stat f_stat;
g_return_val_if_fail (!GST_FLAG_IS_SET (src, GST_DISKSRC_OPEN), FALSE);
g_return_val_if_fail (src->filename != NULL, FALSE);
/* open the file */
src->fd = open (src->filename, O_RDONLY);
if (src->fd < 0) {
perror ("open()");
gst_element_error (GST_ELEMENT (src), "opening file");
return FALSE;
}
if (fstat (src->fd, &f_stat) < 0) {
perror("fstat()");
}
else {
src->size = f_stat.st_size;
DEBUG("gstdisksrc: file size %ld\n", src->size);
}
GST_FLAG_SET (src, GST_DISKSRC_OPEN);
return TRUE;
}
/* close the file */
static void
gst_disksrc_close_file (GstDiskSrc *src)
{
g_return_if_fail (GST_FLAG_IS_SET (src, GST_DISKSRC_OPEN));
/* close the file */
close (src->fd);
/* zero out a lot of our state */
src->fd = 0;
src->curoffset = 0;
src->seq = 0;
src->size = 0;
GST_FLAG_UNSET (src, GST_DISKSRC_OPEN);
}
static GstElementStateReturn
gst_disksrc_change_state (GstElement *element)
{
g_return_val_if_fail (GST_IS_DISKSRC (element), GST_STATE_FAILURE);
DEBUG("gstdisksrc: state pending %d\n", GST_STATE_PENDING (element));
/* if going down into NULL state, close the file if it's open */
if (GST_STATE_PENDING (element) == GST_STATE_NULL) {
if (GST_FLAG_IS_SET (element, GST_DISKSRC_OPEN))
gst_disksrc_close_file (GST_DISKSRC (element));
/* otherwise (READY or higher) we need to open the file */
} else {
if (!GST_FLAG_IS_SET (element, GST_DISKSRC_OPEN)) {
if (!gst_disksrc_open_file (GST_DISKSRC (element)))
return GST_STATE_FAILURE;
}
}
/* if we haven't failed already, give the parent class a chance to ;-) */
if (GST_ELEMENT_CLASS (parent_class)->change_state)
return GST_ELEMENT_CLASS (parent_class)->change_state (element);
return GST_STATE_SUCCESS;
}