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>
66 #include <io.h> /* lseek, open, close, read */
68 #define lseek _lseeki64
74 #ifdef HAVE_SYS_SOCKET_H
75 #include <sys/socket.h>
86 #define S_ISREG(m) (((m)&S_IFREG)==S_IFREG)
93 static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
98 GST_DEBUG_CATEGORY_STATIC (gst_fd_src_debug);
99 #define GST_CAT_DEFAULT gst_fd_src_debug
102 #define DEFAULT_TIMEOUT 0
114 static void gst_fd_src_uri_handler_init (gpointer g_iface, gpointer iface_data);
117 G_IMPLEMENT_INTERFACE (GST_TYPE_URI_HANDLER, gst_fd_src_uri_handler_init); \
118 GST_DEBUG_CATEGORY_INIT (gst_fd_src_debug, "fdsrc", 0, "fdsrc element");
119 #define gst_fd_src_parent_class parent_class
120 G_DEFINE_TYPE_WITH_CODE (GstFdSrc, gst_fd_src, GST_TYPE_PUSH_SRC, _do_init);
122 static void gst_fd_src_set_property (GObject * object, guint prop_id,
123 const GValue * value, GParamSpec * pspec);
124 static void gst_fd_src_get_property (GObject * object, guint prop_id,
125 GValue * value, GParamSpec * pspec);
126 static void gst_fd_src_dispose (GObject * obj);
128 static gboolean gst_fd_src_start (GstBaseSrc * bsrc);
129 static gboolean gst_fd_src_stop (GstBaseSrc * bsrc);
130 static gboolean gst_fd_src_unlock (GstBaseSrc * bsrc);
131 static gboolean gst_fd_src_unlock_stop (GstBaseSrc * bsrc);
132 static gboolean gst_fd_src_is_seekable (GstBaseSrc * bsrc);
133 static gboolean gst_fd_src_get_size (GstBaseSrc * src, guint64 * size);
134 static gboolean gst_fd_src_do_seek (GstBaseSrc * src, GstSegment * segment);
135 static gboolean gst_fd_src_query (GstBaseSrc * src, GstQuery * query);
137 static GstFlowReturn gst_fd_src_create (GstPushSrc * psrc, GstBuffer ** outbuf);
140 gst_fd_src_class_init (GstFdSrcClass * klass)
142 GObjectClass *gobject_class;
143 GstElementClass *gstelement_class;
144 GstBaseSrcClass *gstbasesrc_class;
145 GstPushSrcClass *gstpush_src_class;
147 gobject_class = G_OBJECT_CLASS (klass);
148 gstelement_class = GST_ELEMENT_CLASS (klass);
149 gstbasesrc_class = GST_BASE_SRC_CLASS (klass);
150 gstpush_src_class = GST_PUSH_SRC_CLASS (klass);
152 gobject_class->set_property = gst_fd_src_set_property;
153 gobject_class->get_property = gst_fd_src_get_property;
154 gobject_class->dispose = gst_fd_src_dispose;
156 g_object_class_install_property (gobject_class, PROP_FD,
157 g_param_spec_int ("fd", "fd", "An open file descriptor to read from",
158 0, G_MAXINT, DEFAULT_FD, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
162 * Post a message after timeout microseconds
166 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TIMEOUT,
167 g_param_spec_uint64 ("timeout", "Timeout",
168 "Post a message after timeout microseconds (0 = disabled)", 0,
169 G_MAXUINT64, DEFAULT_TIMEOUT,
170 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
172 gst_element_class_set_details_simple (gstelement_class,
173 "Filedescriptor Source",
175 "Read from a file descriptor", "Erik Walthinsen <omega@cse.ogi.edu>");
176 gst_element_class_add_pad_template (gstelement_class,
177 gst_static_pad_template_get (&srctemplate));
179 gstbasesrc_class->start = GST_DEBUG_FUNCPTR (gst_fd_src_start);
180 gstbasesrc_class->stop = GST_DEBUG_FUNCPTR (gst_fd_src_stop);
181 gstbasesrc_class->unlock = GST_DEBUG_FUNCPTR (gst_fd_src_unlock);
182 gstbasesrc_class->unlock_stop = GST_DEBUG_FUNCPTR (gst_fd_src_unlock_stop);
183 gstbasesrc_class->is_seekable = GST_DEBUG_FUNCPTR (gst_fd_src_is_seekable);
184 gstbasesrc_class->get_size = GST_DEBUG_FUNCPTR (gst_fd_src_get_size);
185 gstbasesrc_class->do_seek = GST_DEBUG_FUNCPTR (gst_fd_src_do_seek);
186 gstbasesrc_class->query = GST_DEBUG_FUNCPTR (gst_fd_src_query);
188 gstpush_src_class->create = GST_DEBUG_FUNCPTR (gst_fd_src_create);
192 gst_fd_src_init (GstFdSrc * fdsrc)
194 fdsrc->new_fd = DEFAULT_FD;
195 fdsrc->seekable_fd = FALSE;
198 fdsrc->timeout = DEFAULT_TIMEOUT;
199 fdsrc->uri = g_strdup_printf ("fd://0");
200 fdsrc->curoffset = 0;
204 gst_fd_src_dispose (GObject * obj)
206 GstFdSrc *src = GST_FD_SRC (obj);
211 G_OBJECT_CLASS (parent_class)->dispose (obj);
215 gst_fd_src_update_fd (GstFdSrc * src, guint64 size)
217 struct stat stat_results;
219 GST_DEBUG_OBJECT (src, "fdset %p, old_fd %d, new_fd %d", src->fdset, src->fd,
222 /* we need to always update the fdset since it may not have existed when
223 * gst_fd_src_update_fd () was called earlier */
224 if (src->fdset != NULL) {
225 GstPollFD fd = GST_POLL_FD_INIT;
229 /* this will log a harmless warning, if it was never added */
230 gst_poll_remove_fd (src->fdset, &fd);
234 gst_poll_add_fd (src->fdset, &fd);
235 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;
244 GST_INFO_OBJECT (src, "Setting size to fd %" G_GUINT64_FORMAT, size);
248 src->uri = g_strdup_printf ("fd://%d", src->fd);
250 if (fstat (src->fd, &stat_results) < 0)
253 if (!S_ISREG (stat_results.st_mode))
256 /* Try a seek of 0 bytes offset to check for seekability */
257 if (lseek (src->fd, 0, SEEK_CUR) < 0)
260 GST_INFO_OBJECT (src, "marking fd %d as seekable", src->fd);
261 src->seekable_fd = TRUE;
263 gst_base_src_set_dynamic_size (GST_BASE_SRC (src), TRUE);
269 GST_INFO_OBJECT (src, "marking fd %d as NOT seekable", src->fd);
270 src->seekable_fd = FALSE;
271 gst_base_src_set_dynamic_size (GST_BASE_SRC (src), FALSE);
276 gst_fd_src_start (GstBaseSrc * bsrc)
278 GstFdSrc *src = GST_FD_SRC (bsrc);
282 if ((src->fdset = gst_poll_new (TRUE)) == NULL)
285 gst_fd_src_update_fd (src, -1);
292 GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ_WRITE, (NULL),
299 gst_fd_src_stop (GstBaseSrc * bsrc)
301 GstFdSrc *src = GST_FD_SRC (bsrc);
304 gst_poll_free (src->fdset);
312 gst_fd_src_unlock (GstBaseSrc * bsrc)
314 GstFdSrc *src = GST_FD_SRC (bsrc);
316 GST_LOG_OBJECT (src, "Flushing");
317 GST_OBJECT_LOCK (src);
318 gst_poll_set_flushing (src->fdset, TRUE);
319 GST_OBJECT_UNLOCK (src);
325 gst_fd_src_unlock_stop (GstBaseSrc * bsrc)
327 GstFdSrc *src = GST_FD_SRC (bsrc);
329 GST_LOG_OBJECT (src, "No longer flushing");
330 GST_OBJECT_LOCK (src);
331 gst_poll_set_flushing (src->fdset, FALSE);
332 GST_OBJECT_UNLOCK (src);
338 gst_fd_src_set_property (GObject * object, guint prop_id, const GValue * value,
341 GstFdSrc *src = GST_FD_SRC (object);
345 src->new_fd = g_value_get_int (value);
347 /* If state is ready or below, update the current fd immediately
348 * so it is reflected in get_properties and uri */
349 GST_OBJECT_LOCK (object);
350 if (GST_STATE (GST_ELEMENT (src)) <= GST_STATE_READY) {
351 GST_DEBUG_OBJECT (src, "state ready or lower, updating to use new fd");
352 gst_fd_src_update_fd (src, -1);
354 GST_DEBUG_OBJECT (src, "state above ready, not updating to new fd yet");
356 GST_OBJECT_UNLOCK (object);
359 src->timeout = g_value_get_uint64 (value);
360 GST_DEBUG_OBJECT (src, "poll timeout set to %" GST_TIME_FORMAT,
361 GST_TIME_ARGS (src->timeout));
364 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
370 gst_fd_src_get_property (GObject * object, guint prop_id, GValue * value,
373 GstFdSrc *src = GST_FD_SRC (object);
377 g_value_set_int (value, src->fd);
380 g_value_set_uint64 (value, src->timeout);
383 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
389 gst_fd_src_create (GstPushSrc * psrc, GstBuffer ** outbuf)
395 GstClockTime timeout;
404 src = GST_FD_SRC (psrc);
406 if (src->timeout > 0) {
407 timeout = src->timeout * GST_USECOND;
409 timeout = GST_CLOCK_TIME_NONE;
416 GST_LOG_OBJECT (src, "doing poll, timeout %" GST_TIME_FORMAT,
417 GST_TIME_ARGS (src->timeout));
419 retval = gst_poll_wait (src->fdset, timeout);
420 GST_LOG_OBJECT (src, "poll returned %d", retval);
422 if (G_UNLIKELY (retval == -1)) {
423 if (errno == EINTR || errno == EAGAIN) {
424 /* retry if interrupted */
426 } else if (errno == EBUSY) {
431 } else if (G_UNLIKELY (retval == 0)) {
433 /* timeout, post element message */
434 gst_element_post_message (GST_ELEMENT_CAST (src),
435 gst_message_new_element (GST_OBJECT_CAST (src),
436 gst_structure_new ("GstFdSrcTimeout",
437 "timeout", G_TYPE_UINT64, src->timeout, NULL)));
439 } while (G_UNLIKELY (try_again)); /* retry if interrupted or timeout */
442 blocksize = GST_BASE_SRC (src)->blocksize;
444 /* create the buffer */
445 buf = gst_buffer_new_allocate (NULL, blocksize, 0);
446 if (G_UNLIKELY (buf == NULL))
449 data = gst_buffer_map (buf, NULL, &maxsize, GST_MAP_WRITE);
452 readbytes = read (src->fd, data, blocksize);
453 GST_LOG_OBJECT (src, "read %" G_GSSIZE_FORMAT, readbytes);
454 } while (readbytes == -1 && errno == EINTR); /* retry if interrupted */
459 gst_buffer_unmap (buf, data, readbytes);
464 GST_BUFFER_OFFSET (buf) = src->curoffset;
465 GST_BUFFER_TIMESTAMP (buf) = GST_CLOCK_TIME_NONE;
466 src->curoffset += readbytes;
468 GST_LOG_OBJECT (psrc, "Read buffer of size %" G_GSSIZE_FORMAT, readbytes);
470 /* we're done, return the buffer */
479 GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),
480 ("poll on file descriptor: %s.", g_strerror (errno)));
481 GST_DEBUG_OBJECT (psrc, "Error during poll");
482 return GST_FLOW_ERROR;
486 GST_DEBUG_OBJECT (psrc, "Poll stopped");
487 return GST_FLOW_WRONG_STATE;
492 GST_ERROR_OBJECT (src, "Failed to allocate %u bytes", blocksize);
493 return GST_FLOW_ERROR;
497 GST_DEBUG_OBJECT (psrc, "Read 0 bytes. EOS.");
498 gst_buffer_unref (buf);
499 return GST_FLOW_UNEXPECTED;
503 GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),
504 ("read on file descriptor: %s.", g_strerror (errno)));
505 GST_DEBUG_OBJECT (psrc, "Error reading from fd");
506 gst_buffer_unmap (buf, data, 0);
507 gst_buffer_unref (buf);
508 return GST_FLOW_ERROR;
513 gst_fd_src_query (GstBaseSrc * basesrc, GstQuery * query)
515 gboolean ret = FALSE;
516 GstFdSrc *src = GST_FD_SRC (basesrc);
518 switch (GST_QUERY_TYPE (query)) {
520 gst_query_set_uri (query, src->uri);
529 ret = GST_BASE_SRC_CLASS (parent_class)->query (basesrc, query);
535 gst_fd_src_is_seekable (GstBaseSrc * bsrc)
537 GstFdSrc *src = GST_FD_SRC (bsrc);
539 return src->seekable_fd;
543 gst_fd_src_get_size (GstBaseSrc * bsrc, guint64 * size)
545 GstFdSrc *src = GST_FD_SRC (bsrc);
546 struct stat stat_results;
548 if (src->size != -1) {
553 if (!src->seekable_fd) {
554 /* If it isn't seekable, we won't know the length (but fstat will still
555 * succeed, and wrongly say our length is zero. */
559 if (fstat (src->fd, &stat_results) < 0)
562 *size = stat_results.st_size;
574 gst_fd_src_do_seek (GstBaseSrc * bsrc, GstSegment * segment)
578 GstFdSrc *src = GST_FD_SRC (bsrc);
580 offset = segment->start;
582 /* No need to seek to the current position */
583 if (offset == src->curoffset)
586 res = lseek (src->fd, offset, SEEK_SET);
587 if (G_UNLIKELY (res < 0 || res != offset))
590 segment->position = segment->start;
591 segment->time = segment->start;
596 GST_DEBUG_OBJECT (src, "lseek returned %" G_GINT64_FORMAT, offset);
600 /*** GSTURIHANDLER INTERFACE *************************************************/
603 gst_fd_src_uri_get_type (void)
609 gst_fd_src_uri_get_protocols (void)
611 static gchar *protocols[] = { (char *) "fd", NULL };
617 gst_fd_src_uri_get_uri (GstURIHandler * handler)
619 GstFdSrc *src = GST_FD_SRC (handler);
625 gst_fd_src_uri_set_uri (GstURIHandler * handler, const gchar * uri)
628 GstFdSrc *src = GST_FD_SRC (handler);
632 GST_INFO_OBJECT (src, "checking uri %s", uri);
634 protocol = gst_uri_get_protocol (uri);
635 if (strcmp (protocol, "fd") != 0) {
641 if (sscanf (uri, "fd://%d", &fd) != 1 || fd < 0)
644 if ((q = g_strstr_len (uri, -1, "?"))) {
647 GST_INFO_OBJECT (src, "found ?");
649 if ((sp = g_strstr_len (q, -1, "size="))) {
650 if (sscanf (sp, "size=%" G_GUINT64_FORMAT, &size) != 1) {
651 GST_INFO_OBJECT (src, "parsing size failed");
654 GST_INFO_OBJECT (src, "found size %" G_GUINT64_FORMAT, size);
661 GST_OBJECT_LOCK (src);
662 if (GST_STATE (GST_ELEMENT (src)) <= GST_STATE_READY) {
663 gst_fd_src_update_fd (src, size);
665 GST_OBJECT_UNLOCK (src);
671 gst_fd_src_uri_handler_init (gpointer g_iface, gpointer iface_data)
673 GstURIHandlerInterface *iface = (GstURIHandlerInterface *) g_iface;
675 iface->get_type = gst_fd_src_uri_get_type;
676 iface->get_protocols = gst_fd_src_uri_get_protocols;
677 iface->get_uri = gst_fd_src_uri_get_uri;
678 iface->set_uri = gst_fd_src_uri_set_uri;