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DEFINITIONS
This source file includes following definitions.
- _do_init
- gst_fd_src_base_init
- gst_fd_src_class_init
- gst_fd_src_init
- gst_fd_src_dispose
- gst_fd_src_update_fd
- gst_fd_src_start
- gst_fd_src_stop
- gst_fd_src_unlock
- gst_fd_src_unlock_stop
- gst_fd_src_set_property
- gst_fd_src_get_property
- gst_fd_src_create
- gst_fd_src_query
- gst_fd_src_is_seekable
- gst_fd_src_get_size
- gst_fd_src_do_seek
- gst_fd_src_uri_get_type
- gst_fd_src_uri_get_protocols
- gst_fd_src_uri_get_uri
- gst_fd_src_uri_set_uri
- gst_fd_src_uri_handler_init
/* 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.
*/
/**
* SECTION:element-fdsrc
* @see_also: #GstFdSink
*
* Read data from a unix file descriptor.
*
* To generate data, enter some data on the console folowed by enter.
* The above mentioned pipeline should dump data packets to the console.
*
* If the #GstFdSrc:timeout property is set to a value bigger than 0, fdsrc will
* generate an element message named
* <classname>"GstFdSrcTimeout"</classname>
* if no data was recieved in the given timeout.
* The message's structure contains one field:
* <itemizedlist>
* <listitem>
* <para>
* #guint64
* <classname>"timeout"</classname>: the timeout in microseconds that
* expired when waiting for data.
* </para>
* </listitem>
* </itemizedlist>
*
* <refsect2>
* <title>Example launch line</title>
* |[
* echo "Hello GStreamer" | gst-launch -v fdsrc ! fakesink dump=true
* ]| A simple pipeline to read from the standard input and dump the data
* with a fakesink as hex ascii block.
* </refsect2>
*
* Last reviewed on 2008-06-20 (0.10.21)
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "gst/gst_private.h"
#include <sys/types.h>
#ifdef G_OS_WIN32
#include <io.h> /* lseek, open, close, read */
#undef lseek
#define lseek _lseeki64
#undef off_t
#define off_t guint64
#endif
#include <sys/stat.h>
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#include <fcntl.h>
#include <stdio.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef _MSC_VER
#undef stat
#define stat _stat
#define fstat _fstat
#define S_ISREG(m) (((m)&S_IFREG)==S_IFREG)
#endif
#include <stdlib.h>
#include <errno.h>
#include "gstfdsrc.h"
static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
GST_DEBUG_CATEGORY_STATIC (gst_fd_src_debug);
#define GST_CAT_DEFAULT gst_fd_src_debug
#define DEFAULT_FD 0
#define DEFAULT_TIMEOUT 0
enum
{
PROP_0,
PROP_FD,
PROP_TIMEOUT,
PROP_LAST
};
static void gst_fd_src_uri_handler_init (gpointer g_iface, gpointer iface_data);
static void
_do_init (GType fd_src_type)
{
static const GInterfaceInfo urihandler_info = {
gst_fd_src_uri_handler_init,
NULL,
NULL
};
g_type_add_interface_static (fd_src_type, GST_TYPE_URI_HANDLER,
&urihandler_info);
GST_DEBUG_CATEGORY_INIT (gst_fd_src_debug, "fdsrc", 0, "fdsrc element");
}
GST_BOILERPLATE_FULL (GstFdSrc, gst_fd_src, GstPushSrc, GST_TYPE_PUSH_SRC,
_do_init);
static void gst_fd_src_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_fd_src_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_fd_src_dispose (GObject * obj);
static gboolean gst_fd_src_start (GstBaseSrc * bsrc);
static gboolean gst_fd_src_stop (GstBaseSrc * bsrc);
static gboolean gst_fd_src_unlock (GstBaseSrc * bsrc);
static gboolean gst_fd_src_unlock_stop (GstBaseSrc * bsrc);
static gboolean gst_fd_src_is_seekable (GstBaseSrc * bsrc);
static gboolean gst_fd_src_get_size (GstBaseSrc * src, guint64 * size);
static gboolean gst_fd_src_do_seek (GstBaseSrc * src, GstSegment * segment);
static gboolean gst_fd_src_query (GstBaseSrc * src, GstQuery * query);
static GstFlowReturn gst_fd_src_create (GstPushSrc * psrc, GstBuffer ** outbuf);
static void
gst_fd_src_base_init (gpointer g_class)
{
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details_simple (gstelement_class,
"Filedescriptor Source",
"Source/File",
"Read from a file descriptor", "Erik Walthinsen <omega@cse.ogi.edu>");
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&srctemplate));
}
static void
gst_fd_src_class_init (GstFdSrcClass * klass)
{
GObjectClass *gobject_class;
GstBaseSrcClass *gstbasesrc_class;
GstPushSrcClass *gstpush_src_class;
gobject_class = G_OBJECT_CLASS (klass);
gstbasesrc_class = GST_BASE_SRC_CLASS (klass);
gstpush_src_class = GST_PUSH_SRC_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
gobject_class->set_property = gst_fd_src_set_property;
gobject_class->get_property = gst_fd_src_get_property;
gobject_class->dispose = gst_fd_src_dispose;
g_object_class_install_property (gobject_class, PROP_FD,
g_param_spec_int ("fd", "fd", "An open file descriptor to read from",
0, G_MAXINT, DEFAULT_FD, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstFdSrc:timeout
*
* Post a message after timeout microseconds
*
* Since: 0.10.21
*/
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TIMEOUT,
g_param_spec_uint64 ("timeout", "Timeout",
"Post a message after timeout microseconds (0 = disabled)", 0,
G_MAXUINT64, DEFAULT_TIMEOUT,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gstbasesrc_class->start = GST_DEBUG_FUNCPTR (gst_fd_src_start);
gstbasesrc_class->stop = GST_DEBUG_FUNCPTR (gst_fd_src_stop);
gstbasesrc_class->unlock = GST_DEBUG_FUNCPTR (gst_fd_src_unlock);
gstbasesrc_class->unlock_stop = GST_DEBUG_FUNCPTR (gst_fd_src_unlock_stop);
gstbasesrc_class->is_seekable = GST_DEBUG_FUNCPTR (gst_fd_src_is_seekable);
gstbasesrc_class->get_size = GST_DEBUG_FUNCPTR (gst_fd_src_get_size);
gstbasesrc_class->do_seek = GST_DEBUG_FUNCPTR (gst_fd_src_do_seek);
gstbasesrc_class->query = GST_DEBUG_FUNCPTR (gst_fd_src_query);
gstpush_src_class->create = GST_DEBUG_FUNCPTR (gst_fd_src_create);
}
static void
gst_fd_src_init (GstFdSrc * fdsrc, GstFdSrcClass * klass)
{
fdsrc->new_fd = DEFAULT_FD;
fdsrc->seekable_fd = FALSE;
fdsrc->fd = -1;
fdsrc->size = -1;
fdsrc->timeout = DEFAULT_TIMEOUT;
fdsrc->uri = g_strdup_printf ("fd://0");
fdsrc->curoffset = 0;
}
static void
gst_fd_src_dispose (GObject * obj)
{
GstFdSrc *src = GST_FD_SRC (obj);
g_free (src->uri);
src->uri = NULL;
G_OBJECT_CLASS (parent_class)->dispose (obj);
}
static void
gst_fd_src_update_fd (GstFdSrc * src, guint64 size)
{
struct stat stat_results;
GST_DEBUG_OBJECT (src, "fdset %p, old_fd %d, new_fd %d", src->fdset, src->fd,
src->new_fd);
/* we need to always update the fdset since it may not have existed when
* gst_fd_src_update_fd () was called earlier */
if (src->fdset != NULL) {
GstPollFD fd = GST_POLL_FD_INIT;
if (src->fd >= 0) {
fd.fd = src->fd;
/* this will log a harmless warning, if it was never added */
gst_poll_remove_fd (src->fdset, &fd);
}
fd.fd = src->new_fd;
gst_poll_add_fd (src->fdset, &fd);
gst_poll_fd_ctl_read (src->fdset, &fd, TRUE);
}
if (src->fd != src->new_fd) {
GST_INFO_OBJECT (src, "Updating to fd %d", src->new_fd);
src->fd = src->new_fd;
GST_INFO_OBJECT (src, "Setting size to fd %" G_GUINT64_FORMAT, size);
src->size = size;
g_free (src->uri);
src->uri = g_strdup_printf ("fd://%d", src->fd);
if (fstat (src->fd, &stat_results) < 0)
goto not_seekable;
if (!S_ISREG (stat_results.st_mode))
goto not_seekable;
/* Try a seek of 0 bytes offset to check for seekability */
if (lseek (src->fd, 0, SEEK_CUR) < 0)
goto not_seekable;
GST_INFO_OBJECT (src, "marking fd %d as seekable", src->fd);
src->seekable_fd = TRUE;
}
return;
not_seekable:
{
GST_INFO_OBJECT (src, "marking fd %d as NOT seekable", src->fd);
src->seekable_fd = FALSE;
}
}
static gboolean
gst_fd_src_start (GstBaseSrc * bsrc)
{
GstFdSrc *src = GST_FD_SRC (bsrc);
src->curoffset = 0;
if ((src->fdset = gst_poll_new (TRUE)) == NULL)
goto socket_pair;
gst_fd_src_update_fd (src, -1);
return TRUE;
/* ERRORS */
socket_pair:
{
GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ_WRITE, (NULL),
GST_ERROR_SYSTEM);
return FALSE;
}
}
static gboolean
gst_fd_src_stop (GstBaseSrc * bsrc)
{
GstFdSrc *src = GST_FD_SRC (bsrc);
if (src->fdset) {
gst_poll_free (src->fdset);
src->fdset = NULL;
}
return TRUE;
}
static gboolean
gst_fd_src_unlock (GstBaseSrc * bsrc)
{
GstFdSrc *src = GST_FD_SRC (bsrc);
GST_LOG_OBJECT (src, "Flushing");
GST_OBJECT_LOCK (src);
gst_poll_set_flushing (src->fdset, TRUE);
GST_OBJECT_UNLOCK (src);
return TRUE;
}
static gboolean
gst_fd_src_unlock_stop (GstBaseSrc * bsrc)
{
GstFdSrc *src = GST_FD_SRC (bsrc);
GST_LOG_OBJECT (src, "No longer flushing");
GST_OBJECT_LOCK (src);
gst_poll_set_flushing (src->fdset, FALSE);
GST_OBJECT_UNLOCK (src);
return TRUE;
}
static void
gst_fd_src_set_property (GObject * object, guint prop_id, const GValue * value,
GParamSpec * pspec)
{
GstFdSrc *src = GST_FD_SRC (object);
switch (prop_id) {
case PROP_FD:
src->new_fd = g_value_get_int (value);
/* If state is ready or below, update the current fd immediately
* so it is reflected in get_properties and uri */
GST_OBJECT_LOCK (object);
if (GST_STATE (GST_ELEMENT (src)) <= GST_STATE_READY) {
GST_DEBUG_OBJECT (src, "state ready or lower, updating to use new fd");
gst_fd_src_update_fd (src, -1);
} else {
GST_DEBUG_OBJECT (src, "state above ready, not updating to new fd yet");
}
GST_OBJECT_UNLOCK (object);
break;
case PROP_TIMEOUT:
src->timeout = g_value_get_uint64 (value);
GST_DEBUG_OBJECT (src, "poll timeout set to %" GST_TIME_FORMAT,
GST_TIME_ARGS (src->timeout));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_fd_src_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstFdSrc *src = GST_FD_SRC (object);
switch (prop_id) {
case PROP_FD:
g_value_set_int (value, src->fd);
break;
case PROP_TIMEOUT:
g_value_set_uint64 (value, src->timeout);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstFlowReturn
gst_fd_src_create (GstPushSrc * psrc, GstBuffer ** outbuf)
{
GstFdSrc *src;
GstBuffer *buf;
gssize readbytes;
guint blocksize;
GstClockTime timeout;
#ifndef HAVE_WIN32
gboolean try_again;
gint retval;
#endif
src = GST_FD_SRC (psrc);
if (src->timeout > 0) {
timeout = src->timeout * GST_USECOND;
} else {
timeout = GST_CLOCK_TIME_NONE;
}
#ifndef HAVE_WIN32
do {
try_again = FALSE;
GST_LOG_OBJECT (src, "doing poll, timeout %" GST_TIME_FORMAT,
GST_TIME_ARGS (src->timeout));
retval = gst_poll_wait (src->fdset, timeout);
GST_LOG_OBJECT (src, "poll returned %d", retval);
if (G_UNLIKELY (retval == -1)) {
if (errno == EINTR || errno == EAGAIN) {
/* retry if interrupted */
try_again = TRUE;
} else if (errno == EBUSY) {
goto stopped;
} else {
goto poll_error;
}
} else if (G_UNLIKELY (retval == 0)) {
try_again = TRUE;
/* timeout, post element message */
gst_element_post_message (GST_ELEMENT_CAST (src),
gst_message_new_element (GST_OBJECT_CAST (src),
gst_structure_new ("GstFdSrcTimeout",
"timeout", G_TYPE_UINT64, src->timeout, NULL)));
}
} while (G_UNLIKELY (try_again)); /* retry if interrupted or timeout */
#endif
blocksize = GST_BASE_SRC (src)->blocksize;
/* create the buffer */
buf = gst_buffer_try_new_and_alloc (blocksize);
if (G_UNLIKELY (buf == NULL)) {
GST_ERROR_OBJECT (src, "Failed to allocate %u bytes", blocksize);
return GST_FLOW_ERROR;
}
do {
readbytes = read (src->fd, GST_BUFFER_DATA (buf), blocksize);
GST_LOG_OBJECT (src, "read %" G_GSSIZE_FORMAT, readbytes);
} 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_LOG_OBJECT (psrc, "Read buffer of size %" G_GSSIZE_FORMAT, readbytes);
/* we're done, return the buffer */
*outbuf = buf;
return GST_FLOW_OK;
/* ERRORS */
#ifndef HAVE_WIN32
poll_error:
{
GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),
("poll on file descriptor: %s.", g_strerror (errno)));
GST_DEBUG_OBJECT (psrc, "Error during poll");
return GST_FLOW_ERROR;
}
stopped:
{
GST_DEBUG_OBJECT (psrc, "Poll 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;
}
}
static gboolean
gst_fd_src_query (GstBaseSrc * basesrc, GstQuery * query)
{
gboolean ret = FALSE;
GstFdSrc *src = GST_FD_SRC (basesrc);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_URI:
gst_query_set_uri (query, src->uri);
ret = TRUE;
break;
default:
ret = FALSE;
break;
}
if (!ret)
ret = GST_BASE_SRC_CLASS (parent_class)->query (basesrc, query);
return ret;
}
static gboolean
gst_fd_src_is_seekable (GstBaseSrc * bsrc)
{
GstFdSrc *src = GST_FD_SRC (bsrc);
return src->seekable_fd;
}
static gboolean
gst_fd_src_get_size (GstBaseSrc * bsrc, guint64 * size)
{
GstFdSrc *src = GST_FD_SRC (bsrc);
struct stat stat_results;
if (src->size != -1) {
*size = src->size;
return TRUE;
}
if (!src->seekable_fd) {
/* If it isn't seekable, we won't know the length (but fstat will still
* succeed, and wrongly say our length is zero. */
return FALSE;
}
if (fstat (src->fd, &stat_results) < 0)
goto could_not_stat;
*size = stat_results.st_size;
return TRUE;
/* ERROR */
could_not_stat:
{
return FALSE;
}
}
static gboolean
gst_fd_src_do_seek (GstBaseSrc * bsrc, GstSegment * segment)
{
gint res;
gint64 offset;
GstFdSrc *src = GST_FD_SRC (bsrc);
offset = segment->start;
/* No need to seek to the current position */
if (offset == src->curoffset)
return TRUE;
res = lseek (src->fd, offset, SEEK_SET);
if (G_UNLIKELY (res < 0 || res != offset))
goto seek_failed;
segment->last_stop = segment->start;
segment->time = segment->start;
return TRUE;
seek_failed:
GST_DEBUG_OBJECT (src, "lseek returned %" G_GINT64_FORMAT, offset);
return FALSE;
}
/*** GSTURIHANDLER INTERFACE *************************************************/
static GstURIType
gst_fd_src_uri_get_type (void)
{
return GST_URI_SRC;
}
static gchar **
gst_fd_src_uri_get_protocols (void)
{
static gchar *protocols[] = { (char *) "fd", NULL };
return protocols;
}
static const gchar *
gst_fd_src_uri_get_uri (GstURIHandler * handler)
{
GstFdSrc *src = GST_FD_SRC (handler);
return src->uri;
}
static gboolean
gst_fd_src_uri_set_uri (GstURIHandler * handler, const gchar * uri)
{
gchar *protocol, *q;
GstFdSrc *src = GST_FD_SRC (handler);
gint fd;
guint64 size = -1;
GST_INFO_OBJECT (src, "checking uri %s", uri);
protocol = gst_uri_get_protocol (uri);
if (strcmp (protocol, "fd") != 0) {
g_free (protocol);
return FALSE;
}
g_free (protocol);
if (sscanf (uri, "fd://%d", &fd) != 1 || fd < 0)
return FALSE;
if ((q = g_strstr_len (uri, -1, "?"))) {
gchar *sp;
GST_INFO_OBJECT (src, "found ?");
if ((sp = g_strstr_len (q, -1, "size="))) {
if (sscanf (sp, "size=%" G_GUINT64_FORMAT, &size) != 1) {
GST_INFO_OBJECT (src, "parsing size failed");
size = -1;
} else {
GST_INFO_OBJECT (src, "found size %" G_GUINT64_FORMAT, size);
}
}
}
src->new_fd = fd;
GST_OBJECT_LOCK (src);
if (GST_STATE (GST_ELEMENT (src)) <= GST_STATE_READY) {
gst_fd_src_update_fd (src, size);
}
GST_OBJECT_UNLOCK (src);
return TRUE;
}
static void
gst_fd_src_uri_handler_init (gpointer g_iface, gpointer iface_data)
{
GstURIHandlerInterface *iface = (GstURIHandlerInterface *) g_iface;
iface->get_type = gst_fd_src_uri_get_type;
iface->get_protocols = gst_fd_src_uri_get_protocols;
iface->get_uri = gst_fd_src_uri_get_uri;
iface->set_uri = gst_fd_src_uri_set_uri;
}