gstreamer/gst/elements/gstmultifilesrc.c

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
* 2001 Dominic Ludlam <dom@recoil.org>
*
* gstmultidisksrc.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 <unistd.h>
#include <sys/mman.h>
/*#define GST_DEBUG_ENABLED*/
#include "gstmultidisksrc.h"
GstElementDetails gst_multidisksrc_details = {
"Multi Disk Source",
"Source/File",
"Read from multiple files in order",
VERSION,
"Dominic Ludlam <dom@openfx.org>",
"(C) 2001",
};
/* DiskSrc signals and args */
enum {
NEW_FILE,
LAST_SIGNAL
};
enum {
ARG_0,
ARG_LOCATIONS,
};
static void gst_multidisksrc_class_init (GstMultiDiskSrcClass *klass);
static void gst_multidisksrc_init (GstMultiDiskSrc *disksrc);
static void gst_multidisksrc_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
static void gst_multidisksrc_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
static GstBuffer * gst_multidisksrc_get (GstPad *pad);
/*static GstBuffer * gst_multidisksrc_get_region (GstPad *pad,GstRegionType type,guint64 offset,guint64 len);*/
static GstElementStateReturn gst_multidisksrc_change_state (GstElement *element);
static gboolean gst_multidisksrc_open_file (GstMultiDiskSrc *src, GstPad *srcpad);
static void gst_multidisksrc_close_file (GstMultiDiskSrc *src);
static GstElementClass *parent_class = NULL;
static guint gst_multidisksrc_signals[LAST_SIGNAL] = { 0 };
GType
gst_multidisksrc_get_type(void)
{
static GType multidisksrc_type = 0;
if (!multidisksrc_type) {
static const GTypeInfo multidisksrc_info = {
sizeof(GstMultiDiskSrcClass), NULL,
NULL,
(GClassInitFunc)gst_multidisksrc_class_init,
NULL,
NULL,
sizeof(GstMultiDiskSrc),
0,
(GInstanceInitFunc)gst_multidisksrc_init,
};
multidisksrc_type = g_type_register_static (GST_TYPE_ELEMENT, "GstMultiDiskSrc", &multidisksrc_info, 0);
}
return multidisksrc_type;
}
static void
gst_multidisksrc_class_init (GstMultiDiskSrcClass *klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
gst_multidisksrc_signals[NEW_FILE] =
g_signal_new ("new_file", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstMultiDiskSrcClass, new_file), NULL, NULL,
g_cclosure_marshal_VOID__POINTER, G_TYPE_NONE, 1,
G_TYPE_POINTER);
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_LOCATIONS,
g_param_spec_string("locations","locations","locations",
NULL, G_PARAM_READWRITE)); /* CHECKME */
gobject_class->set_property = gst_multidisksrc_set_property;
gobject_class->get_property = gst_multidisksrc_get_property;
gstelement_class->change_state = gst_multidisksrc_change_state;
}
static void
gst_multidisksrc_init (GstMultiDiskSrc *multidisksrc)
{
/* GST_FLAG_SET (disksrc, GST_SRC_); */
multidisksrc->srcpad = gst_pad_new ("src", GST_PAD_SRC);
gst_pad_set_get_function (multidisksrc->srcpad,gst_multidisksrc_get);
/* gst_pad_set_getregion_function (multidisksrc->srcpad,gst_multidisksrc_get_region); */
gst_element_add_pad (GST_ELEMENT (multidisksrc), multidisksrc->srcpad);
multidisksrc->listptr = NULL;
multidisksrc->currentfilename = NULL;
multidisksrc->fd = 0;
multidisksrc->size = 0;
multidisksrc->map = NULL;
multidisksrc->new_seek = FALSE;
}
static void
gst_multidisksrc_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
GstMultiDiskSrc *src;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_MULTIDISKSRC (object));
src = GST_MULTIDISKSRC (object);
switch (prop_id) {
case ARG_LOCATIONS:
/* the element must be stopped in order to do this */
g_return_if_fail (GST_STATE (src) < GST_STATE_PLAYING);
/* clear the filename if we get a NULL */
if (g_value_get_pointer (value) == NULL) {
gst_element_set_state (GST_ELEMENT (object), GST_STATE_NULL);
src->listptr = NULL;
/* otherwise set the new filenames */
} else {
src->listptr = g_value_get_pointer (value);
}
break;
default:
break;
}
}
static void
gst_multidisksrc_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
GstMultiDiskSrc *src;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_MULTIDISKSRC (object));
src = GST_MULTIDISKSRC (object);
switch (prop_id) {
case ARG_LOCATIONS:
g_value_set_pointer (value, src->listptr);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/**
* gst_disksrc_get:
* @pad: #GstPad to push a buffer from
*
* Push a new buffer from the disksrc at the current offset.
*/
static GstBuffer *
gst_multidisksrc_get (GstPad *pad)
{
GstMultiDiskSrc *src;
GstBuffer *buf;
GSList *list;
g_return_val_if_fail (pad != NULL, NULL);
src = GST_MULTIDISKSRC (gst_pad_get_parent (pad));
if (GST_FLAG_IS_SET (src, GST_MULTIDISKSRC_OPEN))
gst_multidisksrc_close_file(src);
if (!src->listptr) {
return GST_BUFFER(gst_event_new (GST_EVENT_EOS));
}
list = src->listptr;
src->currentfilename = (gchar *) list->data;
src->listptr = src->listptr->next;
if (!gst_multidisksrc_open_file(src, pad))
return NULL;
/* emitted after the open, as the user may free the list and string from here*/
g_signal_emit(G_OBJECT(src), gst_multidisksrc_signals[NEW_FILE], 0, list);
/* create the buffer */
/* FIXME: should eventually use a bufferpool for this */
buf = gst_buffer_new ();
g_return_val_if_fail (buf != NULL, NULL);
/* simply set the buffer to point to the correct region of the file */
GST_BUFFER_DATA (buf) = src->map;
GST_BUFFER_OFFSET (buf) = 0;
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_DONTFREE);
if (src->new_seek) {
/* fixme, do something here */
src->new_seek = FALSE;
}
/* we're done, return the buffer */
return buf;
}
/* open the file and mmap it, necessary to go to READY state */
static
gboolean gst_multidisksrc_open_file (GstMultiDiskSrc *src, GstPad *srcpad)
{
g_return_val_if_fail (!GST_FLAG_IS_SET (src, GST_MULTIDISKSRC_OPEN), FALSE);
/* open the file */
src->fd = open ((const char *) src->currentfilename, O_RDONLY);
if (src->fd < 0) {
perror ("open");
gst_element_error (GST_ELEMENT (src), g_strconcat("opening file \"", src->currentfilename, "\"", NULL));
return FALSE;
} else {
/* find the file length */
src->size = lseek (src->fd, 0, SEEK_END);
lseek (src->fd, 0, SEEK_SET);
/* map the file into memory */
src->map = mmap (NULL, src->size, PROT_READ, MAP_SHARED, src->fd, 0);
madvise (src->map,src->size, 2);
/* collapse state if that failed */
if (src->map == NULL) {
close (src->fd);
gst_element_error (GST_ELEMENT (src),"mmapping file");
return FALSE;
}
GST_FLAG_SET (src, GST_MULTIDISKSRC_OPEN);
src->new_seek = TRUE;
}
return TRUE;
}
/* unmap and close the file */
static void
gst_multidisksrc_close_file (GstMultiDiskSrc *src)
{
g_return_if_fail (GST_FLAG_IS_SET (src, GST_MULTIDISKSRC_OPEN));
/* unmap the file from memory and close the file */
munmap (src->map, src->size);
close (src->fd);
/* zero out a lot of our state */
src->fd = 0;
src->size = 0;
src->map = NULL;
src->new_seek = FALSE;
GST_FLAG_UNSET (src, GST_MULTIDISKSRC_OPEN);
}
static GstElementStateReturn
gst_multidisksrc_change_state (GstElement *element)
{
g_return_val_if_fail (GST_IS_MULTIDISKSRC (element), GST_STATE_FAILURE);
if (GST_STATE_PENDING (element) == GST_STATE_NULL) {
if (GST_FLAG_IS_SET (element, GST_MULTIDISKSRC_OPEN))
gst_multidisksrc_close_file (GST_MULTIDISKSRC (element));
}
if (GST_ELEMENT_CLASS (parent_class)->change_state)
return GST_ELEMENT_CLASS (parent_class)->change_state (element);
return GST_STATE_SUCCESS;
}