2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000 Wim Taymans <wtay@chello.be>
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
23 #include <sys/types.h>
37 #define DEFAULT_BLOCKSIZE 4096
39 GST_DEBUG_CATEGORY_STATIC (gst_fdsrc_debug);
40 #define GST_CAT_DEFAULT gst_fdsrc_debug
42 GstElementDetails gst_fdsrc_details = GST_ELEMENT_DETAILS ("Disk Source",
44 "Synchronous read from a file",
45 "Erik Walthinsen <omega@cse.ogi.edu>");
48 /* FdSrc signals and args */
63 static guint gst_fdsrc_signals[LAST_SIGNAL] = { 0 };
65 #define _do_init(bla) \
66 GST_DEBUG_CATEGORY_INIT (gst_fdsrc_debug, "fdsrc", 0, "fdsrc element");
68 GST_BOILERPLATE_FULL (GstFdSrc, gst_fdsrc, GstElement, GST_TYPE_ELEMENT,
71 static void gst_fdsrc_set_property (GObject * object, guint prop_id,
72 const GValue * value, GParamSpec * pspec);
73 static void gst_fdsrc_get_property (GObject * object, guint prop_id,
74 GValue * value, GParamSpec * pspec);
76 static GstData *gst_fdsrc_get (GstPad * pad);
80 gst_fdsrc_base_init (gpointer g_class)
82 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
84 gst_element_class_set_details (gstelement_class, &gst_fdsrc_details);
87 gst_fdsrc_class_init (GstFdSrcClass * klass)
89 GObjectClass *gobject_class;
91 gobject_class = G_OBJECT_CLASS (klass);
93 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_FD,
94 g_param_spec_int ("fd", "fd", "An open file descriptor to read from",
95 0, G_MAXINT, 0, G_PARAM_READWRITE));
96 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BLOCKSIZE,
97 g_param_spec_ulong ("blocksize", "Block size",
98 "Size in bytes to read per buffer", 1, G_MAXULONG, DEFAULT_BLOCKSIZE,
100 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_TIMEOUT,
101 g_param_spec_uint64 ("timeout", "Timeout", "Read timeout in nanoseconds",
102 0, G_MAXUINT64, 0, G_PARAM_READWRITE));
104 gst_fdsrc_signals[SIGNAL_TIMEOUT] =
105 g_signal_new ("timeout", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
106 G_STRUCT_OFFSET (GstFdSrcClass, timeout), NULL, NULL,
107 g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
109 gobject_class->set_property = gst_fdsrc_set_property;
110 gobject_class->get_property = gst_fdsrc_get_property;
114 gst_fdsrc_init (GstFdSrc * fdsrc)
116 fdsrc->srcpad = gst_pad_new ("src", GST_PAD_SRC);
118 gst_pad_set_get_function (fdsrc->srcpad, gst_fdsrc_get);
119 gst_element_add_pad (GST_ELEMENT (fdsrc), fdsrc->srcpad);
122 fdsrc->curoffset = 0;
123 fdsrc->blocksize = DEFAULT_BLOCKSIZE;
130 gst_fdsrc_set_property (GObject * object, guint prop_id, const GValue * value,
135 /* it's not null if we got it, but it might not be ours */
136 g_return_if_fail (GST_IS_FDSRC (object));
138 src = GST_FDSRC (object);
142 src->fd = g_value_get_int (value);
145 src->blocksize = g_value_get_ulong (value);
148 src->timeout = g_value_get_uint64 (value);
156 gst_fdsrc_get_property (GObject * object, guint prop_id, GValue * value,
161 /* it's not null if we got it, but it might not be ours */
162 g_return_if_fail (GST_IS_FDSRC (object));
164 src = GST_FDSRC (object);
168 g_value_set_ulong (value, src->blocksize);
171 g_value_set_int (value, src->fd);
174 g_value_set_uint64 (value, src->timeout);
177 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
183 gst_fdsrc_get (GstPad * pad)
189 struct timeval t, *tp = &t;
192 src = GST_FDSRC (gst_pad_get_parent (pad));
194 /* create the buffer */
195 buf = gst_buffer_new_and_alloc (src->blocksize);
198 FD_SET (src->fd, &readfds);
200 if (src->timeout != 0) {
201 GST_TIME_TO_TIMEVAL (src->timeout, t);
206 retval = select (src->fd + 1, &readfds, NULL, NULL, tp);
207 } while (retval == -1 && errno == EINTR); /* retry if interrupted */
210 GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),
211 ("select on file descriptor: %s.", g_strerror (errno)));
212 gst_element_set_eos (GST_ELEMENT (src));
213 return GST_DATA (gst_event_new (GST_EVENT_EOS));
214 } else if (retval == 0) {
215 g_signal_emit (G_OBJECT (src), gst_fdsrc_signals[SIGNAL_TIMEOUT], 0);
216 gst_element_set_eos (GST_ELEMENT (src));
217 return GST_DATA (gst_event_new (GST_EVENT_EOS));
221 readbytes = read (src->fd, GST_BUFFER_DATA (buf), src->blocksize);
222 } while (readbytes == -1 && errno == EINTR); /* retry if interrupted */
225 GST_BUFFER_OFFSET (buf) = src->curoffset;
226 GST_BUFFER_SIZE (buf) = readbytes;
227 GST_BUFFER_TIMESTAMP (buf) = GST_CLOCK_TIME_NONE;
228 src->curoffset += readbytes;
230 /* we're done, return the buffer */
231 return GST_DATA (buf);
232 } else if (readbytes == 0) {
233 gst_element_set_eos (GST_ELEMENT (src));
234 return GST_DATA (gst_event_new (GST_EVENT_EOS));
236 GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),
237 ("read on file descriptor: %s.", g_strerror (errno)));
238 gst_element_set_eos (GST_ELEMENT (src));
239 return GST_DATA (gst_event_new (GST_EVENT_EOS));