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.
26 #include "gst/gst_private.h"
28 #include <sys/types.h>
40 #define DEFAULT_BLOCKSIZE 4096
42 static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
47 GST_DEBUG_CATEGORY_STATIC (gst_fdsrc_debug);
48 #define GST_CAT_DEFAULT gst_fdsrc_debug
50 GstElementDetails gst_fdsrc_details = GST_ELEMENT_DETAILS ("Disk Source",
52 "Synchronous read from a file",
53 "Erik Walthinsen <omega@cse.ogi.edu>");
56 /* FdSrc signals and args */
71 static guint gst_fdsrc_signals[LAST_SIGNAL] = { 0 };
73 #define _do_init(bla) \
74 GST_DEBUG_CATEGORY_INIT (gst_fdsrc_debug, "fdsrc", 0, "fdsrc element");
76 GST_BOILERPLATE_FULL (GstFdSrc, gst_fdsrc, GstElement, GST_TYPE_ELEMENT,
79 static void gst_fdsrc_set_property (GObject * object, guint prop_id,
80 const GValue * value, GParamSpec * pspec);
81 static void gst_fdsrc_get_property (GObject * object, guint prop_id,
82 GValue * value, GParamSpec * pspec);
84 static GstElementStateReturn gst_fdsrc_change_state (GstElement * element);
86 static GstData *gst_fdsrc_get (GstPad * pad);
90 gst_fdsrc_base_init (gpointer g_class)
92 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
94 gst_element_class_add_pad_template (gstelement_class,
95 gst_static_pad_template_get (&srctemplate));
96 gst_element_class_set_details (gstelement_class, &gst_fdsrc_details);
99 gst_fdsrc_class_init (GstFdSrcClass * klass)
101 GObjectClass *gobject_class;
102 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
104 gobject_class = G_OBJECT_CLASS (klass);
106 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_FD,
107 g_param_spec_int ("fd", "fd", "An open file descriptor to read from",
108 0, G_MAXINT, 0, G_PARAM_READWRITE));
109 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BLOCKSIZE,
110 g_param_spec_ulong ("blocksize", "Block size",
111 "Size in bytes to read per buffer", 1, G_MAXULONG, DEFAULT_BLOCKSIZE,
113 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_TIMEOUT,
114 g_param_spec_uint64 ("timeout", "Timeout", "Read timeout in nanoseconds",
115 0, G_MAXUINT64, 0, G_PARAM_READWRITE));
117 gst_fdsrc_signals[SIGNAL_TIMEOUT] =
118 g_signal_new ("timeout", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
119 G_STRUCT_OFFSET (GstFdSrcClass, timeout), NULL, NULL,
120 g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
122 gobject_class->set_property = gst_fdsrc_set_property;
123 gobject_class->get_property = gst_fdsrc_get_property;
125 gstelement_class->change_state = gst_fdsrc_change_state;
129 gst_fdsrc_init (GstFdSrc * fdsrc)
132 gst_pad_new_from_template (gst_static_pad_template_get (&srctemplate),
135 gst_pad_set_get_function (fdsrc->srcpad, gst_fdsrc_get);
136 gst_element_add_pad (GST_ELEMENT (fdsrc), fdsrc->srcpad);
139 fdsrc->curoffset = 0;
140 fdsrc->blocksize = DEFAULT_BLOCKSIZE;
145 static GstElementStateReturn
146 gst_fdsrc_change_state (GstElement * element)
148 GstFdSrc *src = GST_FDSRC (element);
150 switch (GST_STATE_TRANSITION (element)) {
151 case GST_STATE_NULL_TO_READY:
153 case GST_STATE_READY_TO_NULL:
155 case GST_STATE_READY_TO_PAUSED:
158 case GST_STATE_PAUSED_TO_READY:
164 if (GST_ELEMENT_CLASS (parent_class)->change_state)
165 return GST_ELEMENT_CLASS (parent_class)->change_state (element);
167 return GST_STATE_SUCCESS;
172 gst_fdsrc_set_property (GObject * object, guint prop_id, const GValue * value,
177 /* it's not null if we got it, but it might not be ours */
178 g_return_if_fail (GST_IS_FDSRC (object));
180 src = GST_FDSRC (object);
184 src->fd = g_value_get_int (value);
187 src->blocksize = g_value_get_ulong (value);
190 src->timeout = g_value_get_uint64 (value);
193 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
199 gst_fdsrc_get_property (GObject * object, guint prop_id, GValue * value,
204 /* it's not null if we got it, but it might not be ours */
205 g_return_if_fail (GST_IS_FDSRC (object));
207 src = GST_FDSRC (object);
211 g_value_set_ulong (value, src->blocksize);
214 g_value_set_int (value, src->fd);
217 g_value_set_uint64 (value, src->timeout);
220 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
226 gst_fdsrc_get (GstPad * pad)
234 struct timeval t, *tp = &t;
238 src = GST_FDSRC (gst_pad_get_parent (pad));
240 /* create the buffer */
241 buf = gst_buffer_new_and_alloc (src->blocksize);
245 FD_SET (src->fd, &readfds);
247 if (src->timeout != 0) {
248 GST_TIME_TO_TIMEVAL (src->timeout, t);
253 retval = select (src->fd + 1, &readfds, NULL, NULL, tp);
254 } while (retval == -1 && errno == EINTR); /* retry if interrupted */
257 GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),
258 ("select on file descriptor: %s.", g_strerror (errno)));
259 gst_element_set_eos (GST_ELEMENT (src));
260 return GST_DATA (gst_event_new (GST_EVENT_EOS));
261 } else if (retval == 0) {
262 g_signal_emit (G_OBJECT (src), gst_fdsrc_signals[SIGNAL_TIMEOUT], 0);
263 gst_element_set_eos (GST_ELEMENT (src));
264 return GST_DATA (gst_event_new (GST_EVENT_EOS));
269 readbytes = read (src->fd, GST_BUFFER_DATA (buf), src->blocksize);
270 } while (readbytes == -1 && errno == EINTR); /* retry if interrupted */
273 GST_BUFFER_OFFSET (buf) = src->curoffset;
274 GST_BUFFER_SIZE (buf) = readbytes;
275 GST_BUFFER_TIMESTAMP (buf) = GST_CLOCK_TIME_NONE;
276 src->curoffset += readbytes;
278 /* we're done, return the buffer */
279 return GST_DATA (buf);
280 } else if (readbytes == 0) {
281 gst_element_set_eos (GST_ELEMENT (src));
282 return GST_DATA (gst_event_new (GST_EVENT_EOS));
284 GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),
285 ("read on file descriptor: %s.", g_strerror (errno)));
286 gst_element_set_eos (GST_ELEMENT (src));
287 return GST_DATA (gst_event_new (GST_EVENT_EOS));