gstreamer/plugins/elements/gstasyncdisksrc.c
Wim Taymans 1af7640685 Added pulregion handling.
Original commit message from CVS:
Added pulregion handling.
Added GstCapsListFactory in headers
2000-12-06 23:04:12 +00:00

376 lines
10 KiB
C

/* 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>
#include <sys/mman.h>
#include <gstasyncdisksrc.h>
GstElementDetails gst_asyncdisksrc_details = {
"Asynchronous Disk Source",
"Source/File",
"Read from arbitrary point in a file",
VERSION,
"Erik Walthinsen <omega@cse.ogi.edu>",
"(C) 1999",
};
/* AsyncDiskSrc signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
ARG_LOCATION,
ARG_BYTESPERREAD,
ARG_OFFSET,
ARG_SIZE,
};
static void gst_asyncdisksrc_class_init (GstAsyncDiskSrcClass *klass);
static void gst_asyncdisksrc_init (GstAsyncDiskSrc *asyncdisksrc);
static void gst_asyncdisksrc_set_arg (GtkObject *object, GtkArg *arg, guint id);
static void gst_asyncdisksrc_get_arg (GtkObject *object, GtkArg *arg, guint id);
static void gst_asyncdisksrc_pull (GstPad *pad);
static void gst_asyncdisksrc_pull_region (GstPad *pad, gulong offset, gulong size);
static GstElementStateReturn gst_asyncdisksrc_change_state (GstElement *element);
static GstSrcClass *parent_class = NULL;
//static guint gst_asyncdisksrc_signals[LAST_SIGNAL] = { 0 };
GtkType
gst_asyncdisksrc_get_type(void)
{
static GtkType asyncdisksrc_type = 0;
if (!asyncdisksrc_type) {
static const GtkTypeInfo asyncdisksrc_info = {
"GstAsyncDiskSrc",
sizeof(GstAsyncDiskSrc),
sizeof(GstAsyncDiskSrcClass),
(GtkClassInitFunc)gst_asyncdisksrc_class_init,
(GtkObjectInitFunc)gst_asyncdisksrc_init,
(GtkArgSetFunc)gst_asyncdisksrc_set_arg,
(GtkArgGetFunc)gst_asyncdisksrc_get_arg,
(GtkClassInitFunc)NULL,
};
asyncdisksrc_type = gtk_type_unique (GST_TYPE_SRC, &asyncdisksrc_info);
}
return asyncdisksrc_type;
}
static void
gst_asyncdisksrc_class_init (GstAsyncDiskSrcClass *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 ("GstAsyncDiskSrc::location", GST_TYPE_FILENAME,
GTK_ARG_READWRITE, ARG_LOCATION);
gtk_object_add_arg_type ("GstAsyncDiskSrc::bytesperread", GTK_TYPE_INT,
GTK_ARG_READWRITE, ARG_BYTESPERREAD);
gtk_object_add_arg_type ("GstAsyncDiskSrc::offset", GTK_TYPE_LONG,
GTK_ARG_READWRITE, ARG_OFFSET);
gtk_object_add_arg_type ("GstAsyncDiskSrc::size", GTK_TYPE_LONG,
GTK_ARG_READABLE, ARG_SIZE);
gtkobject_class->set_arg = gst_asyncdisksrc_set_arg;
gtkobject_class->get_arg = gst_asyncdisksrc_get_arg;
gstelement_class->change_state = gst_asyncdisksrc_change_state;
}
static void
gst_asyncdisksrc_init (GstAsyncDiskSrc *asyncdisksrc)
{
GST_SRC_SET_FLAGS (asyncdisksrc, GST_SRC_ASYNC);
g_print("init\n");
asyncdisksrc->srcpad = gst_pad_new ("src", GST_PAD_SRC);
gst_pad_set_pull_function (asyncdisksrc->srcpad,gst_asyncdisksrc_pull);
gst_pad_set_pullregion_function (asyncdisksrc->srcpad,gst_asyncdisksrc_pull_region);
// FIXME must set pullregion
gst_element_add_pad (GST_ELEMENT (asyncdisksrc), asyncdisksrc->srcpad);
asyncdisksrc->filename = NULL;
asyncdisksrc->fd = 0;
asyncdisksrc->size = 0;
asyncdisksrc->map = NULL;
asyncdisksrc->curoffset = 0;
asyncdisksrc->bytes_per_read = 4096;
asyncdisksrc->seq = 0;
asyncdisksrc->new_seek = FALSE;
}
static void
gst_asyncdisksrc_set_arg (GtkObject *object, GtkArg *arg, guint id)
{
GstAsyncDiskSrc *src;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_ASYNCDISKSRC (object));
src = GST_ASYNCDISKSRC (object);
switch(id) {
case ARG_LOCATION:
/* the element must be stopped 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_LONG (*arg);
src->new_seek = TRUE;
break;
default:
break;
}
}
static void
gst_asyncdisksrc_get_arg (GtkObject *object, GtkArg *arg, guint id)
{
GstAsyncDiskSrc *src;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_ASYNCDISKSRC (object));
src = GST_ASYNCDISKSRC (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_asyncdisksrc_pull:
* @pad: #GstPad to push a buffer from
*
* Push a new buffer from the asyncdisksrc at the current offset.
*/
static void
gst_asyncdisksrc_pull (GstPad *pad)
{
GstAsyncDiskSrc *src;
GstBuffer *buf;
g_return_if_fail (pad != NULL);
src = GST_ASYNCDISKSRC (gst_pad_get_parent(pad));
g_return_if_fail (GST_FLAG_IS_SET (src, GST_ASYNCDISKSRC_OPEN));
/* deal with EOF state */
if (src->curoffset >= src->size) {
gst_src_signal_eos (GST_SRC (src));
return;
}
/* create the buffer */
// FIXME: should eventually use a bufferpool for this
buf = gst_buffer_new ();
g_return_if_fail (buf != 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;
src->curoffset += GST_BUFFER_SIZE (buf);
if (src->new_seek) {
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLUSH);
src->new_seek = FALSE;
}
/* we're done, push the buffer off now */
gst_pad_push (pad, buf);
}
/**
* gst_asyncdisksrc_pull_region:
* @src: #GstSrc to push a buffer from
* @offset: offset in file
* @size: number of bytes
*
* Push a new buffer from the asyncdisksrc of given size at given offset.
*/
static void
gst_asyncdisksrc_pull_region (GstPad *pad, gulong offset, gulong size)
{
GstAsyncDiskSrc *src;
GstBuffer *buf;
g_return_if_fail (pad != NULL);
src = GST_ASYNCDISKSRC (gst_pad_get_parent(pad));
g_return_if_fail (GST_IS_ASYNCDISKSRC (src));
g_return_if_fail (GST_FLAG_IS_SET (src, GST_ASYNCDISKSRC_OPEN));
/* deal with EOF state */
if (offset >= src->size) {
gst_src_signal_eos (GST_SRC (src));
return;
}
/* create the buffer */
// FIXME: should eventually use a bufferpool for this
buf = gst_buffer_new ();
g_return_if_fail (buf);
/* 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 + size) > src->size) {
GST_BUFFER_SIZE (buf) = src->size - offset;
// FIXME: set the buffer's EOF bit here
} else
GST_BUFFER_SIZE (buf) = size;
/* we're done, push the buffer off now */
gst_pad_push (pad,buf);
}
/* open the file and mmap it, necessary to go to READY state */
static
gboolean gst_asyncdisksrc_open_file (GstAsyncDiskSrc *src)
{
g_return_val_if_fail (!GST_FLAG_IS_SET (src ,GST_ASYNCDISKSRC_OPEN), FALSE);
/* open the file */
src->fd = open (src->filename, O_RDONLY);
if (src->fd < 0) {
gst_element_error (GST_ELEMENT (src), "opening file");
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_ASYNCDISKSRC_OPEN);
}
return TRUE;
}
/* unmap and close the file */
static void
gst_asyncdisksrc_close_file (GstAsyncDiskSrc *src)
{
g_return_if_fail (GST_FLAG_IS_SET (src, GST_ASYNCDISKSRC_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;
GST_FLAG_UNSET (src, GST_ASYNCDISKSRC_OPEN);
}
static
GstElementStateReturn gst_asyncdisksrc_change_state (GstElement *element)
{
g_return_val_if_fail (GST_IS_ASYNCDISKSRC (element), GST_STATE_FAILURE);
if (GST_STATE_PENDING (element) == GST_STATE_NULL) {
if (GST_FLAG_IS_SET (element, GST_ASYNCDISKSRC_OPEN))
gst_asyncdisksrc_close_file (GST_ASYNCDISKSRC (element));
} else {
if (!GST_FLAG_IS_SET (element, GST_ASYNCDISKSRC_OPEN)) {
if (!gst_asyncdisksrc_open_file (GST_ASYNCDISKSRC (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;
}