2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000 Wim Taymans <wtay@chello.be>
4 * 2005 Philippe Khalaf <burger@speedy.org>
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
24 * SECTION:element-fdsrc
25 * @see_also: #GstFdSink
27 * Read data from a unix file descriptor.
29 * To generate data, enter some data on the console folowed by enter.
30 * The above mentioned pipeline should dump data packets to the console.
32 * If the #GstFdSrc:timeout property is set to a value bigger than 0, fdsrc will
33 * generate an element message named
34 * <classname>"GstFdSrcTimeout"</classname>
35 * if no data was recieved in the given timeout.
36 * The message's structure contains one field:
41 * <classname>"timeout"</classname>: the timeout in microseconds that
42 * expired when waiting for data.
48 * <title>Example launch line</title>
50 * echo "Hello GStreamer" | gst-launch -v fdsrc ! fakesink dump=true
51 * ]| A simple pipeline to read from the standard input and dump the data
52 * with a fakesink as hex ascii block.
55 * Last reviewed on 2008-06-20 (0.10.21)
61 #include "gst/gst_private.h"
63 #include <sys/types.h>
65 #include <sys/socket.h>
79 static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
84 GST_DEBUG_CATEGORY_STATIC (gst_fd_src_debug);
85 #define GST_CAT_DEFAULT gst_fd_src_debug
88 #define DEFAULT_TIMEOUT 0
100 static void gst_fd_src_uri_handler_init (gpointer g_iface, gpointer iface_data);
103 _do_init (GType fd_src_type)
105 static const GInterfaceInfo urihandler_info = {
106 gst_fd_src_uri_handler_init,
111 g_type_add_interface_static (fd_src_type, GST_TYPE_URI_HANDLER,
114 GST_DEBUG_CATEGORY_INIT (gst_fd_src_debug, "fdsrc", 0, "fdsrc element");
117 GST_BOILERPLATE_FULL (GstFdSrc, gst_fd_src, GstPushSrc, GST_TYPE_PUSH_SRC,
120 static void gst_fd_src_set_property (GObject * object, guint prop_id,
121 const GValue * value, GParamSpec * pspec);
122 static void gst_fd_src_get_property (GObject * object, guint prop_id,
123 GValue * value, GParamSpec * pspec);
124 static void gst_fd_src_dispose (GObject * obj);
126 static gboolean gst_fd_src_start (GstBaseSrc * bsrc);
127 static gboolean gst_fd_src_stop (GstBaseSrc * bsrc);
128 static gboolean gst_fd_src_unlock (GstBaseSrc * bsrc);
129 static gboolean gst_fd_src_unlock_stop (GstBaseSrc * bsrc);
130 static gboolean gst_fd_src_is_seekable (GstBaseSrc * bsrc);
131 static gboolean gst_fd_src_get_size (GstBaseSrc * src, guint64 * size);
132 static gboolean gst_fd_src_do_seek (GstBaseSrc * src, GstSegment * segment);
133 static gboolean gst_fd_src_query (GstBaseSrc * src, GstQuery * query);
135 static GstFlowReturn gst_fd_src_create (GstPushSrc * psrc, GstBuffer ** outbuf);
138 gst_fd_src_base_init (gpointer g_class)
140 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
142 gst_element_class_set_details_simple (gstelement_class,
143 "Filedescriptor Source",
145 "Read from a file descriptor", "Erik Walthinsen <omega@cse.ogi.edu>");
146 gst_element_class_add_pad_template (gstelement_class,
147 gst_static_pad_template_get (&srctemplate));
151 gst_fd_src_class_init (GstFdSrcClass * klass)
153 GObjectClass *gobject_class;
154 GstBaseSrcClass *gstbasesrc_class;
155 GstElementClass *gstelement_class;
156 GstPushSrcClass *gstpush_src_class;
158 gobject_class = G_OBJECT_CLASS (klass);
159 gstelement_class = GST_ELEMENT_CLASS (klass);
160 gstbasesrc_class = GST_BASE_SRC_CLASS (klass);
161 gstpush_src_class = GST_PUSH_SRC_CLASS (klass);
163 parent_class = g_type_class_peek_parent (klass);
165 gobject_class->set_property = gst_fd_src_set_property;
166 gobject_class->get_property = gst_fd_src_get_property;
167 gobject_class->dispose = gst_fd_src_dispose;
169 g_object_class_install_property (gobject_class, PROP_FD,
170 g_param_spec_int ("fd", "fd", "An open file descriptor to read from",
171 0, G_MAXINT, DEFAULT_FD, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
175 * Post a message after timeout microseconds
179 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TIMEOUT,
180 g_param_spec_uint64 ("timeout", "Timeout",
181 "Post a message after timeout microseconds (0 = disabled)", 0,
182 G_MAXUINT64, DEFAULT_TIMEOUT,
183 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
185 gstbasesrc_class->start = GST_DEBUG_FUNCPTR (gst_fd_src_start);
186 gstbasesrc_class->stop = GST_DEBUG_FUNCPTR (gst_fd_src_stop);
187 gstbasesrc_class->unlock = GST_DEBUG_FUNCPTR (gst_fd_src_unlock);
188 gstbasesrc_class->unlock_stop = GST_DEBUG_FUNCPTR (gst_fd_src_unlock_stop);
189 gstbasesrc_class->is_seekable = GST_DEBUG_FUNCPTR (gst_fd_src_is_seekable);
190 gstbasesrc_class->get_size = GST_DEBUG_FUNCPTR (gst_fd_src_get_size);
191 gstbasesrc_class->do_seek = GST_DEBUG_FUNCPTR (gst_fd_src_do_seek);
192 gstbasesrc_class->query = GST_DEBUG_FUNCPTR (gst_fd_src_query);
194 gstpush_src_class->create = GST_DEBUG_FUNCPTR (gst_fd_src_create);
198 gst_fd_src_init (GstFdSrc * fdsrc, GstFdSrcClass * klass)
201 fdsrc->seekable_fd = FALSE;
202 fdsrc->fd = DEFAULT_FD;
203 fdsrc->timeout = DEFAULT_TIMEOUT;
204 fdsrc->uri = g_strdup_printf ("fd://0");
205 fdsrc->curoffset = 0;
209 gst_fd_src_dispose (GObject * obj)
211 GstFdSrc *src = GST_FD_SRC (obj);
216 G_OBJECT_CLASS (parent_class)->dispose (obj);
220 gst_fd_src_update_fd (GstFdSrc * src)
222 struct stat stat_results;
224 /* we need to always update the fdset since it may not have existed when
225 * gst_fd_src_update_fd () was called earlier */
226 if (src->fdset != NULL) {
227 GstPollFD fd = GST_POLL_FD_INIT;
231 gst_poll_remove_fd (src->fdset, &fd);
235 gst_poll_add_fd (src->fdset, &fd);
236 gst_poll_fd_ctl_read (src->fdset, &fd, TRUE);
239 if (src->fd != src->new_fd) {
240 GST_INFO_OBJECT (src, "Updating to fd %d", src->new_fd);
242 src->fd = src->new_fd;
245 src->uri = g_strdup_printf ("fd://%d", src->fd);
247 if (fstat (src->fd, &stat_results) < 0)
250 if (!S_ISREG (stat_results.st_mode))
253 /* Try a seek of 0 bytes offset to check for seekability */
254 if (lseek (src->fd, 0, SEEK_CUR) < 0)
257 GST_INFO_OBJECT (src, "marking fd %d as seekable", src->fd);
258 src->seekable_fd = TRUE;
264 GST_INFO_OBJECT (src, "marking fd %d as NOT seekable", src->fd);
265 src->seekable_fd = FALSE;
270 gst_fd_src_start (GstBaseSrc * bsrc)
272 GstFdSrc *src = GST_FD_SRC (bsrc);
276 if ((src->fdset = gst_poll_new (TRUE)) == NULL)
279 gst_fd_src_update_fd (src);
286 GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ_WRITE, (NULL),
293 gst_fd_src_stop (GstBaseSrc * bsrc)
295 GstFdSrc *src = GST_FD_SRC (bsrc);
298 gst_poll_free (src->fdset);
306 gst_fd_src_unlock (GstBaseSrc * bsrc)
308 GstFdSrc *src = GST_FD_SRC (bsrc);
310 GST_LOG_OBJECT (src, "Flushing");
311 GST_OBJECT_LOCK (src);
312 gst_poll_set_flushing (src->fdset, TRUE);
313 GST_OBJECT_UNLOCK (src);
319 gst_fd_src_unlock_stop (GstBaseSrc * bsrc)
321 GstFdSrc *src = GST_FD_SRC (bsrc);
323 GST_LOG_OBJECT (src, "No longer flushing");
324 GST_OBJECT_LOCK (src);
325 gst_poll_set_flushing (src->fdset, FALSE);
326 GST_OBJECT_UNLOCK (src);
332 gst_fd_src_set_property (GObject * object, guint prop_id, const GValue * value,
335 GstFdSrc *src = GST_FD_SRC (object);
339 src->new_fd = g_value_get_int (value);
341 /* If state is ready or below, update the current fd immediately
342 * so it is reflected in get_properties and uri */
343 GST_OBJECT_LOCK (object);
344 if (GST_STATE (GST_ELEMENT (src)) <= GST_STATE_READY) {
345 GST_DEBUG_OBJECT (src, "state ready or lower, updating to use new fd");
346 gst_fd_src_update_fd (src);
348 GST_DEBUG_OBJECT (src, "state above ready, not updating to new fd yet");
350 GST_OBJECT_UNLOCK (object);
353 src->timeout = g_value_get_uint64 (value);
354 GST_DEBUG_OBJECT (src, "poll timeout set to %" GST_TIME_FORMAT,
355 GST_TIME_ARGS (src->timeout));
358 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
364 gst_fd_src_get_property (GObject * object, guint prop_id, GValue * value,
367 GstFdSrc *src = GST_FD_SRC (object);
371 g_value_set_int (value, src->fd);
374 g_value_set_uint64 (value, src->timeout);
377 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
383 gst_fd_src_create (GstPushSrc * psrc, GstBuffer ** outbuf)
389 GstClockTime timeout;
396 src = GST_FD_SRC (psrc);
398 if (src->timeout > 0) {
399 timeout = src->timeout * GST_USECOND;
401 timeout = GST_CLOCK_TIME_NONE;
408 GST_LOG_OBJECT (src, "doing poll, timeout %" GST_TIME_FORMAT,
409 GST_TIME_ARGS (src->timeout));
411 retval = gst_poll_wait (src->fdset, timeout);
412 GST_LOG_OBJECT (src, "poll returned %d", retval);
414 if (G_UNLIKELY (retval == -1)) {
415 if (errno == EINTR || errno == EAGAIN) {
416 /* retry if interrupted */
418 } else if (errno == EBUSY) {
423 } else if (G_UNLIKELY (retval == 0)) {
425 /* timeout, post element message */
426 gst_element_post_message (GST_ELEMENT_CAST (src),
427 gst_message_new_element (GST_OBJECT_CAST (src),
428 gst_structure_new ("GstFdSrcTimeout",
429 "timeout", G_TYPE_UINT64, src->timeout, NULL)));
431 } while (G_UNLIKELY (try_again)); /* retry if interrupted or timeout */
434 blocksize = GST_BASE_SRC (src)->blocksize;
436 /* create the buffer */
437 buf = gst_buffer_try_new_and_alloc (blocksize);
438 if (G_UNLIKELY (buf == NULL)) {
439 GST_ERROR_OBJECT (src, "Failed to allocate %u bytes", blocksize);
440 return GST_FLOW_ERROR;
444 readbytes = read (src->fd, GST_BUFFER_DATA (buf), blocksize);
445 GST_LOG_OBJECT (src, "read %" G_GSSIZE_FORMAT, readbytes);
446 } while (readbytes == -1 && errno == EINTR); /* retry if interrupted */
454 GST_BUFFER_OFFSET (buf) = src->curoffset;
455 GST_BUFFER_SIZE (buf) = readbytes;
456 GST_BUFFER_TIMESTAMP (buf) = GST_CLOCK_TIME_NONE;
457 src->curoffset += readbytes;
459 GST_LOG_OBJECT (psrc, "Read buffer of size %" G_GSSIZE_FORMAT, readbytes);
461 /* we're done, return the buffer */
470 GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),
471 ("poll on file descriptor: %s.", g_strerror (errno)));
472 GST_DEBUG_OBJECT (psrc, "Error during poll");
473 return GST_FLOW_ERROR;
477 GST_DEBUG_OBJECT (psrc, "Poll stopped");
478 return GST_FLOW_WRONG_STATE;
483 GST_DEBUG_OBJECT (psrc, "Read 0 bytes. EOS.");
484 gst_buffer_unref (buf);
485 return GST_FLOW_UNEXPECTED;
489 GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),
490 ("read on file descriptor: %s.", g_strerror (errno)));
491 GST_DEBUG_OBJECT (psrc, "Error reading from fd");
492 gst_buffer_unref (buf);
493 return GST_FLOW_ERROR;
498 gst_fd_src_query (GstBaseSrc * basesrc, GstQuery * query)
500 gboolean ret = FALSE;
501 GstFdSrc *src = GST_FD_SRC (basesrc);
503 switch (GST_QUERY_TYPE (query)) {
505 gst_query_set_uri (query, src->uri);
514 ret = GST_BASE_SRC_CLASS (parent_class)->query (basesrc, query);
520 gst_fd_src_is_seekable (GstBaseSrc * bsrc)
522 GstFdSrc *src = GST_FD_SRC (bsrc);
524 return src->seekable_fd;
528 gst_fd_src_get_size (GstBaseSrc * bsrc, guint64 * size)
530 GstFdSrc *src = GST_FD_SRC (bsrc);
531 struct stat stat_results;
533 if (!src->seekable_fd) {
534 /* If it isn't seekable, we won't know the length (but fstat will still
535 * succeed, and wrongly say our length is zero. */
539 if (fstat (src->fd, &stat_results) < 0)
542 *size = stat_results.st_size;
554 gst_fd_src_do_seek (GstBaseSrc * bsrc, GstSegment * segment)
558 GstFdSrc *src = GST_FD_SRC (bsrc);
560 offset = segment->start;
562 /* No need to seek to the current position */
563 if (offset == src->curoffset)
566 res = lseek (src->fd, offset, SEEK_SET);
567 if (G_UNLIKELY (res < 0 || res != offset))
570 segment->last_stop = segment->start;
571 segment->time = segment->start;
576 GST_DEBUG_OBJECT (src, "lseek returned %" G_GINT64_FORMAT, offset);
580 /*** GSTURIHANDLER INTERFACE *************************************************/
583 gst_fd_src_uri_get_type (void)
589 gst_fd_src_uri_get_protocols (void)
591 static gchar *protocols[] = { "fd", NULL };
597 gst_fd_src_uri_get_uri (GstURIHandler * handler)
599 GstFdSrc *src = GST_FD_SRC (handler);
605 gst_fd_src_uri_set_uri (GstURIHandler * handler, const gchar * uri)
608 GstFdSrc *src = GST_FD_SRC (handler);
611 protocol = gst_uri_get_protocol (uri);
612 if (strcmp (protocol, "fd") != 0) {
618 if (sscanf (uri, "fd://%d", &fd) != 1 || fd < 0)
623 GST_OBJECT_LOCK (src);
624 if (GST_STATE (GST_ELEMENT (src)) <= GST_STATE_READY) {
625 gst_fd_src_update_fd (src);
627 GST_OBJECT_UNLOCK (src);
633 gst_fd_src_uri_handler_init (gpointer g_iface, gpointer iface_data)
635 GstURIHandlerInterface *iface = (GstURIHandlerInterface *) g_iface;
637 iface->get_type = gst_fd_src_uri_get_type;
638 iface->get_protocols = gst_fd_src_uri_get_protocols;
639 iface->get_uri = gst_fd_src_uri_get_uri;
640 iface->set_uri = gst_fd_src_uri_set_uri;