gstreamer/gst/elements/gstfdsrc.c
Wim Taymans 71491998d5 gst/elements/gstfdsrc.*: Properly implement fdsrc. Removed signal and timeout, better implemented somewhere else.
Original commit message from CVS:
* gst/elements/gstfdsrc.c: (gst_fdsrc_class_init),
(gst_fdsrc_init), (gst_fdsrc_start), (gst_fdsrc_stop),
(gst_fdsrc_unlock), (gst_fdsrc_set_property),
(gst_fdsrc_get_property), (gst_fdsrc_create):
* gst/elements/gstfdsrc.h:
Properly implement fdsrc. Removed signal and timeout,
better implemented somewhere else.
2005-09-21 09:13:32 +00:00

347 lines
8.4 KiB
C

/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
* 2005 Philippe Khalaf <burger@speedy.org>
*
* 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 <sys/socket.h>
#include <fcntl.h>
#include <stdio.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdlib.h>
#include <errno.h>
#include "gstfdsrc.h"
/* the select call is also performed on the control sockets, that way
* we can send special commands to unblock the select call */
#define CONTROL_STOP 'S' /* stop the select call */
#define CONTROL_SOCKETS(src) src->control_sock
#define WRITE_SOCKET(src) src->control_sock[1]
#define READ_SOCKET(src) src->control_sock[0]
#define SEND_COMMAND(src, command) \
G_STMT_START { \
unsigned char c; c = command; \
write (WRITE_SOCKET(src), &c, 1); \
} G_STMT_END
#define READ_COMMAND(src, command, res) \
G_STMT_START { \
res = read(READ_SOCKET(src), &command, 1); \
} G_STMT_END
#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
};
#define _do_init(bla) \
GST_DEBUG_CATEGORY_INIT (gst_fdsrc_debug, "fdsrc", 0, "fdsrc element");
GST_BOILERPLATE_FULL (GstFdSrc, gst_fdsrc, GstElement, GST_TYPE_PUSH_SRC,
_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 gboolean gst_fdsrc_start (GstBaseSrc * bsrc);
static gboolean gst_fdsrc_stop (GstBaseSrc * bsrc);
static gboolean gst_fdsrc_unlock (GstBaseSrc * bsrc);
static GstFlowReturn gst_fdsrc_create (GstPushSrc * psrc, GstBuffer ** outbuf);
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;
GstBaseSrcClass *gstbasesrc_class;
GstElementClass *gstelement_class;
GstPushSrcClass *gstpush_src_class;
gobject_class = G_OBJECT_CLASS (klass);
gstelement_class = GST_ELEMENT_CLASS (klass);
gstbasesrc_class = (GstBaseSrcClass *) klass;
gstpush_src_class = (GstPushSrcClass *) klass;
parent_class = g_type_class_ref (GST_TYPE_PUSH_SRC);
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));
gstbasesrc_class->start = gst_fdsrc_start;
gstbasesrc_class->stop = gst_fdsrc_stop;
gstbasesrc_class->unlock = gst_fdsrc_unlock;
gstpush_src_class->create = gst_fdsrc_create;
}
static void
gst_fdsrc_init (GstFdSrc * fdsrc, GstFdSrcClass * klass)
{
/* TODO set live only if it's actually a live source (check
* for seekable fd) */
gst_base_src_set_live (GST_BASE_SRC (fdsrc), TRUE);
fdsrc->fd = 0;
fdsrc->curoffset = 0;
}
static gboolean
gst_fdsrc_start (GstBaseSrc * bsrc)
{
GstFdSrc *src = GST_FDSRC (bsrc);
gint control_sock[2];
src->curoffset = 0;
if (socketpair (PF_UNIX, SOCK_STREAM, 0, control_sock) < 0)
goto socket_pair;
READ_SOCKET (src) = control_sock[0];
WRITE_SOCKET (src) = control_sock[1];
fcntl (READ_SOCKET (src), F_SETFL, O_NONBLOCK);
fcntl (WRITE_SOCKET (src), F_SETFL, O_NONBLOCK);
return TRUE;
/* ERRORS */
socket_pair:
{
GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ_WRITE, (NULL),
GST_ERROR_SYSTEM);
return FALSE;
}
}
static gboolean
gst_fdsrc_stop (GstBaseSrc * bsrc)
{
GstFdSrc *src = GST_FDSRC (bsrc);
close (READ_SOCKET (src));
close (WRITE_SOCKET (src));
return TRUE;
}
static gboolean
gst_fdsrc_unlock (GstBaseSrc * bsrc)
{
GstFdSrc *src = GST_FDSRC (bsrc);
SEND_COMMAND (src, CONTROL_STOP);
return TRUE;
}
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;
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_FD:
g_value_set_int (value, src->fd);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstFlowReturn
gst_fdsrc_create (GstPushSrc * psrc, GstBuffer ** outbuf)
{
GstFdSrc *src;
GstBuffer *buf;
glong readbytes;
guint blocksize;
#ifndef HAVE_WIN32
fd_set readfds;
gint retval;
#endif
src = GST_FDSRC (psrc);
#ifndef HAVE_WIN32
FD_ZERO (&readfds);
FD_SET (src->fd, &readfds);
FD_SET (READ_SOCKET (src), &readfds);
do {
retval = select (FD_SETSIZE, &readfds, NULL, NULL, NULL);
} while ((retval == -1 && errno == EINTR));
if (retval == -1)
goto select_error;
if (FD_ISSET (READ_SOCKET (src), &readfds)) {
/* read all stop commands */
while (TRUE) {
gchar command;
int res;
READ_COMMAND (src, command, res);
if (res < 0) {
GST_LOG_OBJECT (src, "no more commands");
/* no more commands */
break;
}
}
goto stopped;
}
#endif
blocksize = GST_BASE_SRC (src)->blocksize;
/* create the buffer */
buf = gst_buffer_new_and_alloc (blocksize);
do {
readbytes = read (src->fd, GST_BUFFER_DATA (buf), blocksize);
} while (readbytes == -1 && errno == EINTR); /* retry if interrupted */
if (readbytes < 0)
goto read_error;
if (readbytes == 0)
goto eos;
GST_BUFFER_OFFSET (buf) = src->curoffset;
GST_BUFFER_SIZE (buf) = readbytes;
GST_BUFFER_TIMESTAMP (buf) = GST_CLOCK_TIME_NONE;
src->curoffset += readbytes;
GST_DEBUG_OBJECT (psrc, "Read buffer of size %u.", readbytes);
/* we're done, return the buffer */
*outbuf = buf;
return GST_FLOW_OK;
/* ERRORS */
#ifndef HAVE_WIN32
select_error:
{
GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),
("select on file descriptor: %s.", g_strerror (errno)));
GST_DEBUG_OBJECT (psrc, "Error during select");
return GST_FLOW_ERROR;
}
stopped:
{
GST_DEBUG_OBJECT (psrc, "Select stopped");
return GST_FLOW_WRONG_STATE;
}
#endif
eos:
{
GST_DEBUG_OBJECT (psrc, "Read 0 bytes. EOS.");
gst_buffer_unref (buf);
return GST_FLOW_UNEXPECTED;
}
read_error:
{
GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),
("read on file descriptor: %s.", g_strerror (errno)));
GST_DEBUG_OBJECT (psrc, "Error reading from fd");
gst_buffer_unref (buf);
return GST_FLOW_ERROR;
}
}