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 <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,
};
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_push(GstSrc *src);
static void gst_disksrc_push_region(GstSrc *src,gulong offset,gulong size);
static gboolean gst_disksrc_change_state(GstElement *element,
GstElementState state);
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", GTK_TYPE_STRING,
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_READWRITE, ARG_OFFSET);
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;
}
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 be stopped in order to do this */
// g_return_if_fail(!GST_FLAG_IS_SET(src,GST_STATE_RUNNING));
if (src->filename) g_free(src->filename);
/* clear the filename if we get a NULL (is that possible?) */
if (GTK_VALUE_STRING(*arg) == NULL) {
src->filename = NULL;
gst_element_set_state(GST_ELEMENT(object),~GST_STATE_COMPLETE);
/* otherwise set the new filename */
} else {
src->filename = g_strdup(GTK_VALUE_STRING(*arg));
gst_element_set_state(GST_ELEMENT(object),GST_STATE_COMPLETE);
}
break;
case ARG_BYTESPERREAD:
src->bytes_per_read = GTK_VALUE_INT(*arg);
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;
default:
arg->type = GTK_TYPE_INVALID;
break;
}
}
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));
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 == 0) {
gst_src_signal_eos(GST_SRC(disksrc));
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);
GST_BUFFER_OFFSET(buf) = disksrc->curoffset;
GST_BUFFER_SIZE(buf) = readbytes;
disksrc->curoffset += readbytes;
/* we're done, push the buffer off now */
gst_pad_push(disksrc->srcpad,buf);
}
/* open the file, necessary to go to RUNNING state */
static gboolean gst_disksrc_open_file(GstDiskSrc *src) {
g_return_if_fail(!GST_FLAG_IS_SET(src,GST_DISKSRC_OPEN));
/* 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;
}
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;
GST_FLAG_UNSET(src,GST_DISKSRC_OPEN);
}
static gboolean gst_disksrc_change_state(GstElement *element,
GstElementState state) {
g_return_if_fail(GST_IS_DISKSRC(element));
switch (state) {
case GST_STATE_RUNNING:
if (!gst_disksrc_open_file(GST_DISKSRC(element)))
return FALSE;
break;
case ~GST_STATE_RUNNING:
gst_disksrc_close_file(GST_DISKSRC(element));
break;
default:
break;
}
if (GST_ELEMENT_CLASS(parent_class)->change_state)
return GST_ELEMENT_CLASS(parent_class)->change_state(element,state);
return TRUE;
}