gstreamer/gst/elements/gstdisksrc.c
Bastien Nocera 427203dc28 - it is now possible to change the opened file when state is PAUSED
Original commit message from CVS:
- it is now possible to change the opened file when state is PAUSED
2001-05-22 19:22:57 +00:00

395 lines
11 KiB
C

/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gstdisksrc.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 "gstdisksrc.h"
GstElementDetails gst_disksrc_details = {
"Disk Source",
"Source/File",
"Read from arbitrary point in 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 GstBuffer * gst_disksrc_get (GstPad *pad);
static GstBuffer * gst_disksrc_get_region (GstPad *pad,GstRegionType type,guint64 offset,guint64 len);
static GstElementStateReturn gst_disksrc_change_state (GstElement *element);
static gboolean gst_disksrc_open_file (GstDiskSrc *src);
static void gst_disksrc_close_file (GstDiskSrc *src);
static GstElementClass *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_ELEMENT, &disksrc_info);
}
return disksrc_type;
}
static void
gst_disksrc_class_init (GstDiskSrcClass *klass)
{
GtkObjectClass *gtkobject_class;
GstElementClass *gstelement_class;
gtkobject_class = (GtkObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
parent_class = gtk_type_class (GST_TYPE_ELEMENT);
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_LONG,
GTK_ARG_READWRITE, ARG_OFFSET);
gtk_object_add_arg_type ("GstDiskSrc::size", GTK_TYPE_LONG,
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;
}
static void
gst_disksrc_init (GstDiskSrc *disksrc)
{
// GST_FLAG_SET (disksrc, GST_SRC_);
disksrc->srcpad = gst_pad_new ("src", GST_PAD_SRC);
gst_pad_set_get_function (disksrc->srcpad,gst_disksrc_get);
gst_pad_set_getregion_function (disksrc->srcpad,gst_disksrc_get_region);
gst_element_add_pad (GST_ELEMENT (disksrc), disksrc->srcpad);
disksrc->filename = NULL;
disksrc->fd = 0;
disksrc->size = 0;
disksrc->map = NULL;
disksrc->curoffset = 0;
disksrc->bytes_per_read = 4096;
disksrc->seq = 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 be stopped or paused in order to do this */
g_return_if_fail ((GST_STATE (src) < GST_STATE_PLAYING)
|| (GST_STATE (src) == GST_STATE_PAUSED));
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));
}
if ((GST_STATE (src) == GST_STATE_PAUSED) && (src->filename != NULL))
{
gst_disksrc_close_file(src);
gst_disksrc_open_file(src);
}
break;
case ARG_BYTESPERREAD:
src->bytes_per_read = GTK_VALUE_INT (*arg);
break;
case ARG_OFFSET:
src->curoffset = GTK_VALUE_LONG (*arg);
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_LONG (*arg) = src->curoffset;
break;
case ARG_SIZE:
GTK_VALUE_LONG (*arg) = src->size;
break;
default:
arg->type = GTK_TYPE_INVALID;
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_disksrc_get (GstPad *pad)
{
GstDiskSrc *src;
GstBuffer *buf;
g_return_val_if_fail (pad != NULL, NULL);
src = GST_DISKSRC (gst_pad_get_parent (pad));
g_return_val_if_fail (GST_FLAG_IS_SET (src, GST_DISKSRC_OPEN), NULL);
/* deal with EOF state */
if (src->curoffset >= src->size) {
gst_pad_set_eos (pad);
return NULL;
}
/* 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 + src->curoffset;
GST_BUFFER_OFFSET (buf) = src->curoffset;
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_DONTFREE);
if ((src->curoffset + src->bytes_per_read) > src->size) {
GST_BUFFER_SIZE (buf) = src->size - src->curoffset;
// FIXME: set the buffer's EOF bit here
} else
GST_BUFFER_SIZE (buf) = src->bytes_per_read;
GST_DEBUG (0,"map %p, offset %ld, size %d\n", src->map, src->curoffset, GST_BUFFER_SIZE (buf));
//gst_util_dump_mem (GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));
src->curoffset += GST_BUFFER_SIZE (buf);
if (src->new_seek) {
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLUSH);
GST_DEBUG (0,"new seek\n");
src->new_seek = FALSE;
}
/* we're done, return the buffer */
return buf;
}
/**
* gst_disksrc_get_region:
* @src: #GstSrc to push a buffer from
* @offset: offset in file
* @size: number of bytes
*
* Push a new buffer from the disksrc of given size at given offset.
*/
static GstBuffer *
gst_disksrc_get_region (GstPad *pad, GstRegionType type,guint64 offset,guint64 len)
{
GstDiskSrc *src;
GstBuffer *buf;
g_return_val_if_fail (pad != NULL, NULL);
g_return_val_if_fail (type == GST_REGION_OFFSET_LEN, NULL);
src = GST_DISKSRC (gst_pad_get_parent (pad));
g_return_val_if_fail (GST_IS_DISKSRC (src), NULL);
g_return_val_if_fail (GST_FLAG_IS_SET (src, GST_DISKSRC_OPEN), NULL);
/* deal with EOF state */
if (offset >= src->size) {
gst_pad_set_eos (pad);
return NULL;
}
/* 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 + offset;
GST_BUFFER_OFFSET (buf) = offset;
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_DONTFREE);
if ((offset + len) > src->size) {
GST_BUFFER_SIZE (buf) = src->size - offset;
// FIXME: set the buffer's EOF bit here
} else
GST_BUFFER_SIZE (buf) = len;
GST_DEBUG (0,"map %p, offset %lld, size %d\n", src->map, offset, GST_BUFFER_SIZE (buf));
/* we're done, return the buffer off now */
return buf;
}
/* open the file and mmap it, necessary to go to READY state */
static gboolean
gst_disksrc_open_file (GstDiskSrc *src)
{
g_return_val_if_fail (!GST_FLAG_IS_SET (src ,GST_DISKSRC_OPEN), FALSE);
/* open the file */
src->fd = open (src->filename, O_RDONLY);
if (src->fd < 0) {
perror ("open");
gst_element_error (GST_ELEMENT (src), g_strconcat("opening file \"", src->filename, "\"", 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_DISKSRC_OPEN);
src->new_seek = TRUE;
}
return TRUE;
}
/* unmap and close the file */
static void
gst_disksrc_close_file (GstDiskSrc *src)
{
g_return_if_fail (GST_FLAG_IS_SET (src, GST_DISKSRC_OPEN));
/* unmap the file from memory */
munmap (src->map, src->size);
/* close the file */
close (src->fd);
/* zero out a lot of our state */
src->fd = 0;
src->size = 0;
src->map = NULL;
src->curoffset = 0;
src->seq = 0;
src->new_seek = FALSE;
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);
if (GST_STATE_PENDING (element) == GST_STATE_NULL) {
if (GST_FLAG_IS_SET (element, GST_DISKSRC_OPEN))
gst_disksrc_close_file (GST_DISKSRC (element));
} else {
if (!GST_FLAG_IS_SET (element, GST_DISKSRC_OPEN)) {
if (!gst_disksrc_open_file (GST_DISKSRC (element)))
return GST_STATE_FAILURE;
}
}
if (GST_ELEMENT_CLASS (parent_class)->change_state)
return GST_ELEMENT_CLASS (parent_class)->change_state (element);
return GST_STATE_SUCCESS;
}