gstreamer/plugins/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>
*
* gstmultifilesrc.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>
#include <errno.h>
#include <string.h>
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "../gst-i18n-lib.h"
#include "gstmultifilesrc.h"
GST_DEBUG_CATEGORY_STATIC (gst_multifilesrc_debug);
#define GST_CAT_DEFAULT gst_multifilesrc_debug
GstElementDetails gst_multifilesrc_details =
GST_ELEMENT_DETAILS ("Multi File Source",
"Source/File",
"Read from multiple files in order",
"Dominic Ludlam <dom@openfx.org>");
/* FileSrc signals and args */
enum
{
NEW_FILE,
LAST_SIGNAL
};
enum
{
ARG_0,
ARG_LOCATIONS
};
#define _do_init(bla) \
GST_DEBUG_CATEGORY_INIT (gst_multifilesrc_debug, "multifilesrc", 0, "multifilesrc element");
GST_BOILERPLATE_FULL (GstMultiFileSrc, gst_multifilesrc, GstElement,
GST_TYPE_ELEMENT, _do_init);
static void gst_multifilesrc_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_multifilesrc_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstData *gst_multifilesrc_get (GstPad * pad);
/*static GstBuffer * gst_multifilesrc_get_region (GstPad *pad,GstRegionType type,guint64 offset,guint64 len);*/
static GstElementStateReturn gst_multifilesrc_change_state (GstElement *
element);
static gboolean gst_multifilesrc_open_file (GstMultiFileSrc * src,
GstPad * srcpad);
static void gst_multifilesrc_close_file (GstMultiFileSrc * src);
static guint gst_multifilesrc_signals[LAST_SIGNAL] = { 0 };
static void
gst_multifilesrc_base_init (gpointer g_class)
{
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details (gstelement_class, &gst_multifilesrc_details);
}
static void
gst_multifilesrc_class_init (GstMultiFileSrcClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gst_multifilesrc_signals[NEW_FILE] =
g_signal_new ("new-file", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstMultiFileSrcClass, new_file), NULL, NULL,
g_cclosure_marshal_VOID__STRING, G_TYPE_NONE, 1, G_TYPE_STRING);
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_LOCATIONS, g_param_spec_pointer ("locations", "locations", "locations", G_PARAM_READWRITE)); /* CHECKME */
gobject_class->set_property = gst_multifilesrc_set_property;
gobject_class->get_property = gst_multifilesrc_get_property;
gstelement_class->change_state = gst_multifilesrc_change_state;
}
static void
gst_multifilesrc_init (GstMultiFileSrc * multifilesrc)
{
/* GST_FLAG_SET (filesrc, GST_SRC_); */
multifilesrc->srcpad = gst_pad_new ("src", GST_PAD_SRC);
gst_pad_set_get_function (multifilesrc->srcpad, gst_multifilesrc_get);
/* gst_pad_set_getregion_function (multifilesrc->srcpad,gst_multifilesrc_get_region); */
gst_element_add_pad (GST_ELEMENT (multifilesrc), multifilesrc->srcpad);
multifilesrc->listptr = NULL;
multifilesrc->currentfilename = NULL;
multifilesrc->fd = 0;
multifilesrc->size = 0;
multifilesrc->map = NULL;
multifilesrc->new_seek = FALSE;
}
static void
gst_multifilesrc_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstMultiFileSrc *src;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_MULTIFILESRC (object));
src = GST_MULTIFILESRC (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_multifilesrc_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstMultiFileSrc *src;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_MULTIFILESRC (object));
src = GST_MULTIFILESRC (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_filesrc_get:
* @pad: #GstPad to push a buffer from
*
* Push a new buffer from the filesrc at the current offset.
*/
static GstData *
gst_multifilesrc_get (GstPad * pad)
{
GstMultiFileSrc *src;
GstBuffer *buf;
GSList *list;
g_return_val_if_fail (pad != NULL, NULL);
src = GST_MULTIFILESRC (gst_pad_get_parent (pad));
if (GST_FLAG_IS_SET (src, GST_MULTIFILESRC_OPEN))
gst_multifilesrc_close_file (src);
if (!src->listptr) {
return GST_DATA (gst_event_new (GST_EVENT_EOS));
}
list = src->listptr;
src->currentfilename = (gchar *) list->data;
src->listptr = src->listptr->next;
if (!gst_multifilesrc_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_multifilesrc_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_SIZE (buf) = src->size;
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 GST_DATA (buf);
}
/* open the file and mmap it, necessary to go to READY state */
static gboolean
gst_multifilesrc_open_file (GstMultiFileSrc * src, GstPad * srcpad)
{
g_return_val_if_fail (!GST_FLAG_IS_SET (src, GST_MULTIFILESRC_OPEN), FALSE);
if (src->currentfilename == NULL || src->currentfilename[0] == '\0') {
GST_ELEMENT_ERROR (src, RESOURCE, NOT_FOUND,
(_("No file name specified for reading.")), (NULL));
return FALSE;
}
/* open the file. FIXME: do we need to use O_LARGEFILE here? */
src->fd = open ((const char *) src->currentfilename, O_RDONLY);
if (src->fd < 0) {
GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ,
(_("Could not open file \"%s\" for reading."), src->currentfilename),
GST_ERROR_SYSTEM);
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.
* FIXME: don't map the whole file at once, there might
* be restrictions set. Get max size via getrlimit
* or re-try with smaller size if mmap fails with ENOMEM? */
src->map = mmap (NULL, src->size, PROT_READ, MAP_SHARED, src->fd, 0);
madvise (src->map, src->size, MADV_SEQUENTIAL);
/* collapse state if that failed */
if (src->map == NULL) {
close (src->fd);
GST_ELEMENT_ERROR (src, RESOURCE, TOO_LAZY, (NULL),
("mmap call failed."));
return FALSE;
}
GST_FLAG_SET (src, GST_MULTIFILESRC_OPEN);
src->new_seek = TRUE;
}
return TRUE;
}
/* unmap and close the file */
static void
gst_multifilesrc_close_file (GstMultiFileSrc * src)
{
g_return_if_fail (GST_FLAG_IS_SET (src, GST_MULTIFILESRC_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_MULTIFILESRC_OPEN);
}
static GstElementStateReturn
gst_multifilesrc_change_state (GstElement * element)
{
g_return_val_if_fail (GST_IS_MULTIFILESRC (element), GST_STATE_FAILURE);
if (GST_STATE_PENDING (element) == GST_STATE_NULL) {
if (GST_FLAG_IS_SET (element, GST_MULTIFILESRC_OPEN))
gst_multifilesrc_close_file (GST_MULTIFILESRC (element));
}
if (GST_ELEMENT_CLASS (parent_class)->change_state)
return GST_ELEMENT_CLASS (parent_class)->change_state (element);
return GST_STATE_SUCCESS;
}