gstreamer/gst/elements/gstfdsrc.c
Andy Wingo 82a5239bfe gst/elements, testsuite: Null if we got it...
Original commit message from CVS:
2005-07-05  Andy Wingo  <wingo@pobox.com>

* gst/elements, testsuite: Null if we got it...
2005-07-05 10:58:21 +00:00

287 lines
7.6 KiB
C

/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gstfdsrc.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.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "gst/gst_private.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdlib.h>
#include <errno.h>
#include "gstfdsrc.h"
#define DEFAULT_BLOCKSIZE 4096
static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
GST_DEBUG_CATEGORY_STATIC (gst_fdsrc_debug);
#define GST_CAT_DEFAULT gst_fdsrc_debug
GstElementDetails gst_fdsrc_details = GST_ELEMENT_DETAILS ("Disk Source",
"Source/File",
"Synchronous read from a file",
"Erik Walthinsen <omega@cse.ogi.edu>");
/* FdSrc signals and args */
enum
{
SIGNAL_TIMEOUT,
LAST_SIGNAL
};
enum
{
ARG_0,
ARG_FD,
ARG_BLOCKSIZE,
ARG_TIMEOUT
};
static guint gst_fdsrc_signals[LAST_SIGNAL] = { 0 };
#define _do_init(bla) \
GST_DEBUG_CATEGORY_INIT (gst_fdsrc_debug, "fdsrc", 0, "fdsrc element");
GST_BOILERPLATE_FULL (GstFdSrc, gst_fdsrc, GstElement, GST_TYPE_ELEMENT,
_do_init);
static void gst_fdsrc_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_fdsrc_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstElementStateReturn gst_fdsrc_change_state (GstElement * element);
static GstData *gst_fdsrc_get (GstPad * pad);
static void
gst_fdsrc_base_init (gpointer g_class)
{
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&srctemplate));
gst_element_class_set_details (gstelement_class, &gst_fdsrc_details);
}
static void
gst_fdsrc_class_init (GstFdSrcClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
gobject_class = G_OBJECT_CLASS (klass);
gobject_class->set_property = gst_fdsrc_set_property;
gobject_class->get_property = gst_fdsrc_get_property;
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_FD,
g_param_spec_int ("fd", "fd", "An open file descriptor to read from",
0, G_MAXINT, 0, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BLOCKSIZE,
g_param_spec_ulong ("blocksize", "Block size",
"Size in bytes to read per buffer", 1, G_MAXULONG, DEFAULT_BLOCKSIZE,
G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_TIMEOUT,
g_param_spec_uint64 ("timeout", "Timeout", "Read timeout in nanoseconds",
0, G_MAXUINT64, 0, G_PARAM_READWRITE));
gst_fdsrc_signals[SIGNAL_TIMEOUT] =
g_signal_new ("timeout", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstFdSrcClass, timeout), NULL, NULL,
g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
gstelement_class->change_state = gst_fdsrc_change_state;
}
static void
gst_fdsrc_init (GstFdSrc * fdsrc)
{
fdsrc->srcpad =
gst_pad_new_from_template (gst_static_pad_template_get (&srctemplate),
"src");
gst_pad_set_get_function (fdsrc->srcpad, gst_fdsrc_get);
gst_element_add_pad (GST_ELEMENT (fdsrc), fdsrc->srcpad);
fdsrc->fd = 0;
fdsrc->curoffset = 0;
fdsrc->blocksize = DEFAULT_BLOCKSIZE;
fdsrc->timeout = 0;
fdsrc->seq = 0;
}
static GstElementStateReturn
gst_fdsrc_change_state (GstElement * element)
{
GstFdSrc *src = GST_FDSRC (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_NULL_TO_READY:
break;
case GST_STATE_READY_TO_NULL:
break;
case GST_STATE_READY_TO_PAUSED:
src->curoffset = 0;
break;
case GST_STATE_PAUSED_TO_READY:
break;
default:
break;
}
if (GST_ELEMENT_CLASS (parent_class)->change_state)
return GST_ELEMENT_CLASS (parent_class)->change_state (element);
return GST_STATE_SUCCESS;
}
static void
gst_fdsrc_set_property (GObject * object, guint prop_id, const GValue * value,
GParamSpec * pspec)
{
GstFdSrc *src;
g_return_if_fail (GST_IS_FDSRC (object));
src = GST_FDSRC (object);
switch (prop_id) {
case ARG_FD:
src->fd = g_value_get_int (value);
break;
case ARG_BLOCKSIZE:
src->blocksize = g_value_get_ulong (value);
break;
case ARG_TIMEOUT:
src->timeout = g_value_get_uint64 (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_fdsrc_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstFdSrc *src;
g_return_if_fail (GST_IS_FDSRC (object));
src = GST_FDSRC (object);
switch (prop_id) {
case ARG_BLOCKSIZE:
g_value_set_ulong (value, src->blocksize);
break;
case ARG_FD:
g_value_set_int (value, src->fd);
break;
case ARG_TIMEOUT:
g_value_set_uint64 (value, src->timeout);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstData *
gst_fdsrc_get (GstPad * pad)
{
GstFdSrc *src;
GstBuffer *buf;
glong readbytes;
#ifndef HAVE_WIN32
fd_set readfds;
struct timeval t, *tp = &t;
gint retval;
#endif
src = GST_FDSRC (gst_pad_get_parent (pad));
/* create the buffer */
buf = gst_buffer_new_and_alloc (src->blocksize);
#ifndef HAVE_WIN32
FD_ZERO (&readfds);
FD_SET (src->fd, &readfds);
if (src->timeout != 0) {
GST_TIME_TO_TIMEVAL (src->timeout, t);
} else
tp = NULL;
do {
retval = select (src->fd + 1, &readfds, NULL, NULL, tp);
} while (retval == -1 && errno == EINTR); /* retry if interrupted */
if (retval == -1) {
GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),
("select on file descriptor: %s.", g_strerror (errno)));
gst_element_set_eos (GST_ELEMENT (src));
return GST_DATA (gst_event_new (GST_EVENT_EOS));
} else if (retval == 0) {
g_signal_emit (G_OBJECT (src), gst_fdsrc_signals[SIGNAL_TIMEOUT], 0);
gst_element_set_eos (GST_ELEMENT (src));
return GST_DATA (gst_event_new (GST_EVENT_EOS));
}
#endif
do {
readbytes = read (src->fd, GST_BUFFER_DATA (buf), src->blocksize);
} while (readbytes == -1 && errno == EINTR); /* retry if interrupted */
if (readbytes > 0) {
GST_BUFFER_OFFSET (buf) = src->curoffset;
GST_BUFFER_SIZE (buf) = readbytes;
GST_BUFFER_TIMESTAMP (buf) = GST_CLOCK_TIME_NONE;
src->curoffset += readbytes;
/* we're done, return the buffer */
return GST_DATA (buf);
} else if (readbytes == 0) {
gst_element_set_eos (GST_ELEMENT (src));
return GST_DATA (gst_event_new (GST_EVENT_EOS));
} else {
GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),
("read on file descriptor: %s.", g_strerror (errno)));
gst_element_set_eos (GST_ELEMENT (src));
return GST_DATA (gst_event_new (GST_EVENT_EOS));
}
}