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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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65752f7e8d
Parse a size=value from the query string to specify a size. This is interesting when reading from a file descriptor that actually has a size (and is not stat-able, such as the socket of an http connection)
685 lines
17 KiB
C
685 lines
17 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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* 2005 Philippe Khalaf <burger@speedy.org>
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*
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* gstfdsrc.c:
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:element-fdsrc
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* @see_also: #GstFdSink
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*
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* Read data from a unix file descriptor.
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*
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* To generate data, enter some data on the console folowed by enter.
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* The above mentioned pipeline should dump data packets to the console.
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*
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* If the #GstFdSrc:timeout property is set to a value bigger than 0, fdsrc will
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* generate an element message named
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* <classname>"GstFdSrcTimeout"</classname>
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* if no data was recieved in the given timeout.
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* The message's structure contains one field:
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* <itemizedlist>
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* <listitem>
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* <para>
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* #guint64
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* <classname>"timeout"</classname>: the timeout in microseconds that
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* expired when waiting for data.
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* </para>
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* </listitem>
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* </itemizedlist>
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*
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* <refsect2>
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* <title>Example launch line</title>
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* |[
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* echo "Hello GStreamer" | gst-launch -v fdsrc ! fakesink dump=true
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* ]| A simple pipeline to read from the standard input and dump the data
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* with a fakesink as hex ascii block.
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* </refsect2>
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*
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* Last reviewed on 2008-06-20 (0.10.21)
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include "gst/gst_private.h"
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#include <sys/types.h>
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#ifdef G_OS_WIN32
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#include <io.h> /* lseek, open, close, read */
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#undef lseek
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#define lseek _lseeki64
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#undef off_t
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#define off_t guint64
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#endif
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#include <sys/stat.h>
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#include <fcntl.h>
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#include <stdio.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef _MSC_VER
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#undef stat
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#define stat _stat
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#define fstat _fstat
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#define S_ISREG(m) (((m)&S_IFREG)==S_IFREG)
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#endif
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#include <stdlib.h>
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#include <errno.h>
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#include "gstfdsrc.h"
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static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS_ANY);
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GST_DEBUG_CATEGORY_STATIC (gst_fd_src_debug);
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#define GST_CAT_DEFAULT gst_fd_src_debug
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#define DEFAULT_FD 0
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#define DEFAULT_TIMEOUT 0
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enum
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{
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PROP_0,
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PROP_FD,
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PROP_TIMEOUT,
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PROP_LAST
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};
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static void gst_fd_src_uri_handler_init (gpointer g_iface, gpointer iface_data);
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static void
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_do_init (GType fd_src_type)
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{
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static const GInterfaceInfo urihandler_info = {
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gst_fd_src_uri_handler_init,
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NULL,
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NULL
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};
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g_type_add_interface_static (fd_src_type, GST_TYPE_URI_HANDLER,
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&urihandler_info);
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GST_DEBUG_CATEGORY_INIT (gst_fd_src_debug, "fdsrc", 0, "fdsrc element");
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}
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GST_BOILERPLATE_FULL (GstFdSrc, gst_fd_src, GstPushSrc, GST_TYPE_PUSH_SRC,
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_do_init);
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static void gst_fd_src_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_fd_src_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static void gst_fd_src_dispose (GObject * obj);
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static gboolean gst_fd_src_start (GstBaseSrc * bsrc);
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static gboolean gst_fd_src_stop (GstBaseSrc * bsrc);
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static gboolean gst_fd_src_unlock (GstBaseSrc * bsrc);
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static gboolean gst_fd_src_unlock_stop (GstBaseSrc * bsrc);
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static gboolean gst_fd_src_is_seekable (GstBaseSrc * bsrc);
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static gboolean gst_fd_src_get_size (GstBaseSrc * src, guint64 * size);
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static gboolean gst_fd_src_do_seek (GstBaseSrc * src, GstSegment * segment);
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static gboolean gst_fd_src_query (GstBaseSrc * src, GstQuery * query);
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static GstFlowReturn gst_fd_src_create (GstPushSrc * psrc, GstBuffer ** outbuf);
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static void
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gst_fd_src_base_init (gpointer g_class)
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{
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GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
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gst_element_class_set_details_simple (gstelement_class,
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"Filedescriptor Source",
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"Source/File",
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"Read from a file descriptor", "Erik Walthinsen <omega@cse.ogi.edu>");
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&srctemplate));
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}
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static void
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gst_fd_src_class_init (GstFdSrcClass * klass)
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{
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GObjectClass *gobject_class;
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GstBaseSrcClass *gstbasesrc_class;
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GstPushSrcClass *gstpush_src_class;
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gobject_class = G_OBJECT_CLASS (klass);
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gstbasesrc_class = GST_BASE_SRC_CLASS (klass);
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gstpush_src_class = GST_PUSH_SRC_CLASS (klass);
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parent_class = g_type_class_peek_parent (klass);
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gobject_class->set_property = gst_fd_src_set_property;
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gobject_class->get_property = gst_fd_src_get_property;
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gobject_class->dispose = gst_fd_src_dispose;
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g_object_class_install_property (gobject_class, PROP_FD,
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g_param_spec_int ("fd", "fd", "An open file descriptor to read from",
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0, G_MAXINT, DEFAULT_FD, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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/**
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* GstFdSrc:timeout
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*
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* Post a message after timeout microseconds
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*
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* Since: 0.10.21
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*/
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g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TIMEOUT,
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g_param_spec_uint64 ("timeout", "Timeout",
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"Post a message after timeout microseconds (0 = disabled)", 0,
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G_MAXUINT64, DEFAULT_TIMEOUT,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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gstbasesrc_class->start = GST_DEBUG_FUNCPTR (gst_fd_src_start);
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gstbasesrc_class->stop = GST_DEBUG_FUNCPTR (gst_fd_src_stop);
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gstbasesrc_class->unlock = GST_DEBUG_FUNCPTR (gst_fd_src_unlock);
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gstbasesrc_class->unlock_stop = GST_DEBUG_FUNCPTR (gst_fd_src_unlock_stop);
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gstbasesrc_class->is_seekable = GST_DEBUG_FUNCPTR (gst_fd_src_is_seekable);
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gstbasesrc_class->get_size = GST_DEBUG_FUNCPTR (gst_fd_src_get_size);
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gstbasesrc_class->do_seek = GST_DEBUG_FUNCPTR (gst_fd_src_do_seek);
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gstbasesrc_class->query = GST_DEBUG_FUNCPTR (gst_fd_src_query);
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gstpush_src_class->create = GST_DEBUG_FUNCPTR (gst_fd_src_create);
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}
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static void
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gst_fd_src_init (GstFdSrc * fdsrc, GstFdSrcClass * klass)
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{
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fdsrc->new_fd = DEFAULT_FD;
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fdsrc->seekable_fd = FALSE;
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fdsrc->fd = -1;
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fdsrc->size = -1;
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fdsrc->timeout = DEFAULT_TIMEOUT;
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fdsrc->uri = g_strdup_printf ("fd://0");
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fdsrc->curoffset = 0;
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}
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static void
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gst_fd_src_dispose (GObject * obj)
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{
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GstFdSrc *src = GST_FD_SRC (obj);
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g_free (src->uri);
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src->uri = NULL;
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G_OBJECT_CLASS (parent_class)->dispose (obj);
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}
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static void
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gst_fd_src_update_fd (GstFdSrc * src, guint64 size)
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{
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struct stat stat_results;
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GST_DEBUG_OBJECT (src, "fdset %p, old_fd %d, new_fd %d", src->fdset, src->fd,
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src->new_fd);
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/* we need to always update the fdset since it may not have existed when
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* gst_fd_src_update_fd () was called earlier */
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if (src->fdset != NULL) {
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GstPollFD fd = GST_POLL_FD_INIT;
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if (src->fd >= 0) {
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fd.fd = src->fd;
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/* this will log a harmless warning, if it was never added */
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gst_poll_remove_fd (src->fdset, &fd);
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}
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fd.fd = src->new_fd;
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gst_poll_add_fd (src->fdset, &fd);
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gst_poll_fd_ctl_read (src->fdset, &fd, TRUE);
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}
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if (src->fd != src->new_fd) {
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GST_INFO_OBJECT (src, "Updating to fd %d", src->new_fd);
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src->fd = src->new_fd;
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GST_INFO_OBJECT (src, "Setting size to fd %" G_GUINT64_FORMAT, size);
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src->size = size;
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g_free (src->uri);
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src->uri = g_strdup_printf ("fd://%d", src->fd);
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if (fstat (src->fd, &stat_results) < 0)
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goto not_seekable;
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if (!S_ISREG (stat_results.st_mode))
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goto not_seekable;
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/* Try a seek of 0 bytes offset to check for seekability */
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if (lseek (src->fd, 0, SEEK_CUR) < 0)
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goto not_seekable;
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GST_INFO_OBJECT (src, "marking fd %d as seekable", src->fd);
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src->seekable_fd = TRUE;
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}
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return;
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not_seekable:
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{
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GST_INFO_OBJECT (src, "marking fd %d as NOT seekable", src->fd);
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src->seekable_fd = FALSE;
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}
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}
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static gboolean
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gst_fd_src_start (GstBaseSrc * bsrc)
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{
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GstFdSrc *src = GST_FD_SRC (bsrc);
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src->curoffset = 0;
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if ((src->fdset = gst_poll_new (TRUE)) == NULL)
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goto socket_pair;
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gst_fd_src_update_fd (src, -1);
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return TRUE;
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/* ERRORS */
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socket_pair:
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{
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GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ_WRITE, (NULL),
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GST_ERROR_SYSTEM);
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return FALSE;
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}
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}
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static gboolean
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gst_fd_src_stop (GstBaseSrc * bsrc)
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{
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GstFdSrc *src = GST_FD_SRC (bsrc);
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if (src->fdset) {
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gst_poll_free (src->fdset);
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src->fdset = NULL;
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}
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return TRUE;
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}
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static gboolean
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gst_fd_src_unlock (GstBaseSrc * bsrc)
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{
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GstFdSrc *src = GST_FD_SRC (bsrc);
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GST_LOG_OBJECT (src, "Flushing");
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GST_OBJECT_LOCK (src);
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gst_poll_set_flushing (src->fdset, TRUE);
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GST_OBJECT_UNLOCK (src);
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return TRUE;
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}
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static gboolean
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gst_fd_src_unlock_stop (GstBaseSrc * bsrc)
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{
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GstFdSrc *src = GST_FD_SRC (bsrc);
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GST_LOG_OBJECT (src, "No longer flushing");
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GST_OBJECT_LOCK (src);
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gst_poll_set_flushing (src->fdset, FALSE);
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GST_OBJECT_UNLOCK (src);
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return TRUE;
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}
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static void
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gst_fd_src_set_property (GObject * object, guint prop_id, const GValue * value,
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GParamSpec * pspec)
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{
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GstFdSrc *src = GST_FD_SRC (object);
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switch (prop_id) {
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case PROP_FD:
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src->new_fd = g_value_get_int (value);
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/* If state is ready or below, update the current fd immediately
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* so it is reflected in get_properties and uri */
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GST_OBJECT_LOCK (object);
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if (GST_STATE (GST_ELEMENT (src)) <= GST_STATE_READY) {
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GST_DEBUG_OBJECT (src, "state ready or lower, updating to use new fd");
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gst_fd_src_update_fd (src, -1);
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} else {
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GST_DEBUG_OBJECT (src, "state above ready, not updating to new fd yet");
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}
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GST_OBJECT_UNLOCK (object);
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break;
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case PROP_TIMEOUT:
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src->timeout = g_value_get_uint64 (value);
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GST_DEBUG_OBJECT (src, "poll timeout set to %" GST_TIME_FORMAT,
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GST_TIME_ARGS (src->timeout));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_fd_src_get_property (GObject * object, guint prop_id, GValue * value,
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GParamSpec * pspec)
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{
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GstFdSrc *src = GST_FD_SRC (object);
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switch (prop_id) {
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case PROP_FD:
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g_value_set_int (value, src->fd);
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break;
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case PROP_TIMEOUT:
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g_value_set_uint64 (value, src->timeout);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static GstFlowReturn
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gst_fd_src_create (GstPushSrc * psrc, GstBuffer ** outbuf)
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{
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GstFdSrc *src;
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GstBuffer *buf;
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gssize readbytes;
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guint blocksize;
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GstClockTime timeout;
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#ifndef HAVE_WIN32
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gboolean try_again;
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gint retval;
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#endif
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src = GST_FD_SRC (psrc);
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if (src->timeout > 0) {
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timeout = src->timeout * GST_USECOND;
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} else {
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timeout = GST_CLOCK_TIME_NONE;
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}
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#ifndef HAVE_WIN32
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do {
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try_again = FALSE;
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GST_LOG_OBJECT (src, "doing poll, timeout %" GST_TIME_FORMAT,
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GST_TIME_ARGS (src->timeout));
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retval = gst_poll_wait (src->fdset, timeout);
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GST_LOG_OBJECT (src, "poll returned %d", retval);
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if (G_UNLIKELY (retval == -1)) {
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if (errno == EINTR || errno == EAGAIN) {
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/* retry if interrupted */
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try_again = TRUE;
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} else if (errno == EBUSY) {
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goto stopped;
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} else {
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goto poll_error;
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}
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} else if (G_UNLIKELY (retval == 0)) {
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try_again = TRUE;
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/* timeout, post element message */
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gst_element_post_message (GST_ELEMENT_CAST (src),
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gst_message_new_element (GST_OBJECT_CAST (src),
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gst_structure_new ("GstFdSrcTimeout",
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"timeout", G_TYPE_UINT64, src->timeout, NULL)));
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}
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} while (G_UNLIKELY (try_again)); /* retry if interrupted or timeout */
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#endif
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blocksize = GST_BASE_SRC (src)->blocksize;
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/* create the buffer */
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buf = gst_buffer_try_new_and_alloc (blocksize);
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if (G_UNLIKELY (buf == NULL)) {
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GST_ERROR_OBJECT (src, "Failed to allocate %u bytes", blocksize);
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return GST_FLOW_ERROR;
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}
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do {
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readbytes = read (src->fd, GST_BUFFER_DATA (buf), blocksize);
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GST_LOG_OBJECT (src, "read %" G_GSSIZE_FORMAT, readbytes);
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} while (readbytes == -1 && errno == EINTR); /* retry if interrupted */
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if (readbytes < 0)
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goto read_error;
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if (readbytes == 0)
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goto eos;
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GST_BUFFER_OFFSET (buf) = src->curoffset;
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GST_BUFFER_SIZE (buf) = readbytes;
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GST_BUFFER_TIMESTAMP (buf) = GST_CLOCK_TIME_NONE;
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src->curoffset += readbytes;
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GST_LOG_OBJECT (psrc, "Read buffer of size %" G_GSSIZE_FORMAT, readbytes);
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/* we're done, return the buffer */
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*outbuf = buf;
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return GST_FLOW_OK;
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/* ERRORS */
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#ifndef HAVE_WIN32
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poll_error:
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{
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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;
|
|
}
|