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.
28 #include "gstfilesrc.h"
39 /**********************************************************************
40 * GStreamer Default File Source
43 * This source uses mmap(2) to efficiently load data from a file.
44 * To do this without seriously polluting the applications' memory
45 * space, it must do so in smaller chunks, say 1-4MB at a time.
46 * Buffers are then subdivided from these mmap'd chunks, to directly
47 * make use of the mmap.
49 * To handle refcounting so that the mmap can be freed at the appropriate
50 * time, a buffer will be created for each mmap'd region, and all new
51 * buffers will be sub-buffers of this top-level buffer. As they are
52 * freed, the refcount goes down on the mmap'd buffer and its free()
53 * function is called, which will call munmap(2) on itself.
55 * If a buffer happens to cross the boundaries of an mmap'd region, we
56 * have to decide whether it's more efficient to copy the data into a
57 * new buffer, or mmap() just that buffer. There will have to be a
58 * breakpoint size to determine which will be done. The mmap() size
59 * has a lot to do with this as well, because you end up in double-
60 * jeopardy: the larger the outgoing buffer, the more data to copy when
61 * it overlaps, *and* the more frequently you'll have buffers that *do*
64 * Seeking is another tricky aspect to do efficiently. The initial
65 * implementation of this source won't make use of these features, however.
66 * The issue is that if an application seeks backwards in a file, *and*
67 * that region of the file is covered by an mmap that hasn't been fully
68 * deallocated, we really should re-use it. But keeping track of these
69 * regions is tricky because we have to lock the structure that holds
70 * them. We need to settle on a locking primitive (GMutex seems to be
71 * a really good option...), then we can do that.
75 GST_DEBUG_CATEGORY (gst_filesrc_debug);
76 #define GST_CAT_DEFAULT gst_filesrc_debug
78 GstElementDetails gst_filesrc_details = {
82 "Read from arbitrary point in a file",
84 "Erik Walthinsen <omega@cse.ogi.edu>",
88 #define DEFAULT_BLOCKSIZE 4*1024
89 #define DEFAULT_MMAPSIZE 4*1024*1024
91 #ifdef G_HAVE_ISO_VARARGS
93 /* #define fs_print(...) g_print(__VA_ARGS__) */
96 #elif defined(G_HAVE_GNUC_VARARGS)
98 /* #define fs_print(format,args...) g_print(format, ## args) */
99 #define fs_print(format,args...)
103 /* FileSrc signals and args */
118 GST_PAD_EVENT_MASK_FUNCTION (gst_filesrc_get_event_mask,
119 { GST_EVENT_SEEK, GST_SEEK_METHOD_CUR |
120 GST_SEEK_METHOD_SET |
121 GST_SEEK_METHOD_END |
122 GST_SEEK_FLAG_FLUSH },
123 { GST_EVENT_FLUSH, 0 },
124 { GST_EVENT_SIZE, 0 }
127 GST_PAD_QUERY_TYPE_FUNCTION (gst_filesrc_get_query_types,
132 GST_PAD_FORMATS_FUNCTION (gst_filesrc_get_formats,
136 static void gst_filesrc_class_init (GstFileSrcClass *klass);
137 static void gst_filesrc_init (GstFileSrc *filesrc);
138 static void gst_filesrc_dispose (GObject *object);
140 static void gst_filesrc_set_property (GObject *object, guint prop_id,
141 const GValue *value, GParamSpec *pspec);
142 static void gst_filesrc_get_property (GObject *object, guint prop_id,
143 GValue *value, GParamSpec *pspec);
145 static GstBuffer * gst_filesrc_get (GstPad *pad);
146 static gboolean gst_filesrc_srcpad_event (GstPad *pad, GstEvent *event);
147 static gboolean gst_filesrc_srcpad_query (GstPad *pad, GstQueryType type,
148 GstFormat *format, gint64 *value);
150 static GstElementStateReturn gst_filesrc_change_state (GstElement *element);
153 static GstElementClass *parent_class = NULL;
154 /*static guint gst_filesrc_signals[LAST_SIGNAL] = { 0 };*/
157 gst_filesrc_get_type(void)
159 static GType filesrc_type = 0;
162 static const GTypeInfo filesrc_info = {
163 sizeof(GstFileSrcClass), NULL,
165 (GClassInitFunc)gst_filesrc_class_init,
170 (GInstanceInitFunc)gst_filesrc_init,
172 filesrc_type = g_type_register_static (GST_TYPE_ELEMENT, "GstFileSrc", &filesrc_info, 0);
178 gst_filesrc_class_init (GstFileSrcClass *klass)
180 GObjectClass *gobject_class;
181 GstElementClass *gstelement_class;
183 gobject_class = (GObjectClass*)klass;
184 gstelement_class = (GstElementClass*)klass;
186 parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
188 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_FD,
189 g_param_spec_int ("fd", "File-descriptor", "File-descriptor for the file being mmap()d",
190 0, G_MAXINT, 0, G_PARAM_READABLE));
191 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_LOCATION,
192 g_param_spec_string ("location", "File Location", "Location of the file to read",
193 NULL, G_PARAM_READWRITE));
194 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BLOCKSIZE,
195 g_param_spec_ulong ("blocksize", "Block size", "Size in bytes to read per buffer",
196 1, G_MAXULONG, DEFAULT_BLOCKSIZE, G_PARAM_READWRITE));
197 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_MMAPSIZE,
198 g_param_spec_ulong ("mmapsize", "mmap() Block Size",
199 "Size in bytes of mmap()d regions",
200 0, G_MAXULONG, DEFAULT_MMAPSIZE, G_PARAM_READWRITE));
201 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_TOUCH,
202 g_param_spec_boolean ("touch", "Touch read data",
203 "Touch data to force disk read",
204 FALSE, G_PARAM_READWRITE));
206 gobject_class->dispose = gst_filesrc_dispose;
207 gobject_class->set_property = gst_filesrc_set_property;
208 gobject_class->get_property = gst_filesrc_get_property;
210 gstelement_class->change_state = gst_filesrc_change_state;
214 gst_filesrc_bufcmp (gconstpointer a, gconstpointer b)
216 /* GstBuffer *bufa = (GstBuffer *)a, *bufb = (GstBuffer *)b;*/
218 /* sort first by offset, then in reverse by size */
219 if (GST_BUFFER_OFFSET(a) < GST_BUFFER_OFFSET(b)) return -1;
220 else if (GST_BUFFER_OFFSET(a) > GST_BUFFER_OFFSET(b)) return 1;
221 else if (GST_BUFFER_SIZE(a) > GST_BUFFER_SIZE(b)) return -1;
222 else if (GST_BUFFER_SIZE(a) < GST_BUFFER_SIZE(b)) return 1;
227 gst_filesrc_init (GstFileSrc *src)
229 src->srcpad = gst_pad_new ("src", GST_PAD_SRC);
230 gst_pad_set_get_function (src->srcpad, gst_filesrc_get);
231 gst_pad_set_event_function (src->srcpad, gst_filesrc_srcpad_event);
232 gst_pad_set_event_mask_function (src->srcpad, gst_filesrc_get_event_mask);
233 gst_pad_set_query_function (src->srcpad, gst_filesrc_srcpad_query);
234 gst_pad_set_query_type_function (src->srcpad, gst_filesrc_get_query_types);
235 gst_pad_set_formats_function (src->srcpad, gst_filesrc_get_formats);
236 gst_element_add_pad (GST_ELEMENT (src), src->srcpad);
238 src->pagesize = getpagesize();
240 src->filename = NULL;
245 src->block_size = DEFAULT_BLOCKSIZE;
249 src->mapsize = DEFAULT_MMAPSIZE; /* default is 4MB */
251 src->map_regions = g_tree_new (gst_filesrc_bufcmp);
252 src->map_regions_lock = g_mutex_new();
254 src->seek_happened = FALSE;
258 gst_filesrc_dispose (GObject *object)
262 src = GST_FILESRC (object);
264 G_OBJECT_CLASS (parent_class)->dispose (object);
266 g_tree_destroy (src->map_regions);
267 g_mutex_free (src->map_regions_lock);
269 g_free (src->filename);
274 gst_filesrc_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
278 /* it's not null if we got it, but it might not be ours */
279 g_return_if_fail (GST_IS_FILESRC (object));
281 src = GST_FILESRC (object);
285 /* the element must be stopped in order to do this */
286 g_return_if_fail (GST_STATE (src) < GST_STATE_PLAYING);
288 if (src->filename) g_free (src->filename);
289 /* clear the filename if we get a NULL (is that possible?) */
290 if (g_value_get_string (value) == NULL) {
291 gst_element_set_state (GST_ELEMENT (object), GST_STATE_NULL);
292 src->filename = NULL;
293 /* otherwise set the new filename */
295 src->filename = g_strdup (g_value_get_string (value));
297 g_object_notify (G_OBJECT (src), "location");
300 src->block_size = g_value_get_ulong (value);
301 g_object_notify (G_OBJECT (src), "blocksize");
304 if ((src->mapsize % src->pagesize) == 0) {
305 src->mapsize = g_value_get_ulong (value);
306 g_object_notify (G_OBJECT (src), "mmapsize");
308 GST_INFO ( "invalid mapsize, must a multiple of pagesize, which is %d",
313 src->touch = g_value_get_boolean (value);
314 g_object_notify (G_OBJECT (src), "touch");
322 gst_filesrc_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
326 /* it's not null if we got it, but it might not be ours */
327 g_return_if_fail (GST_IS_FILESRC (object));
329 src = GST_FILESRC (object);
333 g_value_set_string (value, src->filename);
336 g_value_set_int (value, src->fd);
339 g_value_set_ulong (value, src->block_size);
342 g_value_set_ulong (value, src->mapsize);
345 g_value_set_boolean (value, src->touch);
348 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
354 gst_filesrc_free_parent_mmap (GstBuffer *buf)
356 GstFileSrc *src = GST_FILESRC (GST_BUFFER_POOL_PRIVATE (buf));
358 fs_print ("freeing mmap()d buffer at %d+%d\n",
359 GST_BUFFER_OFFSET (buf), GST_BUFFER_SIZE (buf));
361 /* remove the buffer from the list of available mmap'd regions */
362 g_mutex_lock (src->map_regions_lock);
363 g_tree_remove (src->map_regions, buf);
364 /* check to see if the tree is empty */
365 if (g_tree_nnodes (src->map_regions) == 0) {
366 /* we have to free the bufferpool we don't have yet */
368 g_mutex_unlock (src->map_regions_lock);
371 /* madvise to tell the kernel what to do with it */
372 madvise (GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf), MADV_DONTNEED);
374 /* now unmap the memory */
375 munmap (GST_BUFFER_DATA (buf), GST_BUFFER_MAXSIZE (buf));
376 /* cast to unsigned long, since there's no gportable way to print
378 GST_DEBUG ( "unmapped region %08lx+%08lx at %p",
379 (unsigned long) GST_BUFFER_OFFSET (buf),
380 (unsigned long) GST_BUFFER_MAXSIZE (buf),
381 GST_BUFFER_DATA (buf));
383 GST_BUFFER_DATA (buf) = NULL;
385 gst_buffer_default_free (buf);
389 gst_filesrc_map_region (GstFileSrc *src, off_t offset, size_t size)
395 g_return_val_if_fail (offset >= 0, NULL);
397 fs_print ("mapping region %08llx+%08x from file into memory\n",offset,size);
398 mmapregion = mmap (NULL, size, PROT_READ, MAP_SHARED, src->fd, offset);
400 if (mmapregion == NULL) {
401 gst_element_error (GST_ELEMENT (src), "couldn't map file");
404 else if (mmapregion == MAP_FAILED) {
405 gst_element_error (GST_ELEMENT (src), "mmap (0x%x, %d, 0x%llx) : %s",
406 size, src->fd, offset, strerror (errno));
409 GST_DEBUG ( "mapped region %08lx+%08lx from file into memory at %p",
410 (unsigned long)offset, (unsigned long)size, mmapregion);
412 /* time to allocate a new mapbuf */
413 buf = gst_buffer_new ();
414 /* mmap() the data into this new buffer */
415 GST_BUFFER_DATA (buf) = mmapregion;
417 #ifdef MADV_SEQUENTIAL
418 /* madvise to tell the kernel what to do with it */
419 retval = madvise (GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf), MADV_SEQUENTIAL);
421 /* fill in the rest of the fields */
422 GST_BUFFER_FLAG_SET (buf, GST_BUFFER_READONLY);
423 GST_BUFFER_FLAG_SET (buf, GST_BUFFER_ORIGINAL);
424 GST_BUFFER_SIZE (buf) = size;
425 GST_BUFFER_MAXSIZE (buf) = size;
426 GST_BUFFER_OFFSET (buf) = offset;
427 GST_BUFFER_TIMESTAMP (buf) = GST_CLOCK_TIME_NONE;
428 GST_BUFFER_POOL_PRIVATE (buf) = src;
429 GST_BUFFER_FREE_FUNC (buf) = (GstDataFreeFunction) gst_filesrc_free_parent_mmap;
431 g_mutex_lock (src->map_regions_lock);
432 g_tree_insert (src->map_regions,buf,buf);
433 g_mutex_unlock (src->map_regions_lock);
439 gst_filesrc_map_small_region (GstFileSrc *src, off_t offset, size_t size)
445 /* printf("attempting to map a small buffer at %d+%d\n",offset,size); */
447 /* if the offset starts at a non-page boundary, we have to special case */
448 if ((mod = offset % src->pagesize)) {
451 mapbase = offset - mod;
452 mapsize = ((size + mod + src->pagesize - 1) / src->pagesize) * src->pagesize;
453 /* printf("not on page boundaries, resizing map to %d+%d\n",mapbase,mapsize);*/
454 map = gst_filesrc_map_region(src, mapbase, mapsize);
458 ret = gst_buffer_create_sub (map, offset - mapbase, size);
459 GST_BUFFER_OFFSET (ret) = GST_BUFFER_OFFSET (map) + offset - mapbase;
461 gst_buffer_unref (map);
466 return gst_filesrc_map_region(src,offset,size);
474 /* This allows us to search for a potential mmap region. */
476 gst_filesrc_search_region_match (gpointer a, gpointer b)
478 GstFileSrcRegion *r = (GstFileSrcRegion *)b;
480 /* trying to walk b down the tree, current node is a */
481 if (r->offset < GST_BUFFER_OFFSET(a)) return -1;
482 else if (r->offset >= (GST_BUFFER_OFFSET(a) + GST_BUFFER_SIZE(a))) return 1;
483 else if ((r->offset + r->size) <= (GST_BUFFER_OFFSET(a) + GST_BUFFER_SIZE(a))) return 0;
490 * @pad: #GstPad to push a buffer from
492 * Push a new buffer from the filesrc at the current offset.
495 gst_filesrc_get (GstPad *pad)
498 GstBuffer *buf = NULL, *map;
499 size_t readsize, mapsize;
500 off_t readend,mapstart,mapend;
501 GstFileSrcRegion region;
504 g_return_val_if_fail (pad != NULL, NULL);
505 src = GST_FILESRC (gst_pad_get_parent (pad));
506 g_return_val_if_fail (GST_FLAG_IS_SET (src, GST_FILESRC_OPEN), NULL);
509 if (src->seek_happened) {
512 src->seek_happened = FALSE;
513 GST_DEBUG ("filesrc sending discont");
514 event = gst_event_new_discontinuous (FALSE, GST_FORMAT_BYTES, src->curoffset, NULL);
515 src->need_flush = FALSE;
516 return GST_BUFFER (event);
518 /* check for flush */
519 if (src->need_flush) {
520 src->need_flush = FALSE;
521 GST_DEBUG ("filesrc sending flush");
522 return GST_BUFFER (gst_event_new_flush ());
526 if (src->curoffset == src->filelen) {
527 GST_DEBUG ("filesrc eos %" G_GINT64_FORMAT" %" G_GINT64_FORMAT,
528 src->curoffset, src->filelen);
529 gst_element_set_eos (GST_ELEMENT (src));
530 return GST_BUFFER (gst_event_new (GST_EVENT_EOS));
533 /* calculate end pointers so we don't have to do so repeatedly later */
534 readsize = src->block_size;
535 readend = src->curoffset + src->block_size; /* note this is the byte *after* the read */
536 mapstart = GST_BUFFER_OFFSET (src->mapbuf);
537 mapsize = GST_BUFFER_SIZE (src->mapbuf);
538 mapend = mapstart + mapsize; /* note this is the byte *after* the map */
540 /* check to see if we're going to overflow the end of the file */
541 if (readend > src->filelen) {
542 readsize = src->filelen - src->curoffset;
543 readend = src->curoffset + readsize;
546 GST_LOG ("attempting to read %08lx, %08lx, %08lx, %08lx",
547 (unsigned long)readsize, (unsigned long)readend,
548 (unsigned long)mapstart, (unsigned long)mapend);
550 /* if the start is past the mapstart */
551 if (src->curoffset >= mapstart) {
552 /* if the end is before the mapend, the buffer is in current mmap region... */
553 /* ('cause by definition if readend is in the buffer, so's readstart) */
554 if (readend <= mapend) {
555 fs_print ("read buf %llu+%d lives in current mapbuf %lld+%d, creating subbuffer of mapbuf\n",
556 src->curoffset, readsize, mapstart, mapsize);
557 buf = gst_buffer_create_sub (src->mapbuf, src->curoffset - mapstart,
559 GST_BUFFER_OFFSET (buf) = src->curoffset;
561 /* if the start actually is within the current mmap region, map an overlap buffer */
562 } else if (src->curoffset < mapend) {
563 fs_print ("read buf %llu+%d starts in mapbuf %d+%d but ends outside, creating new mmap\n",
564 src->curoffset, readsize, mapstart, mapsize);
565 buf = gst_filesrc_map_small_region (src, src->curoffset, readsize);
570 /* the only other option is that buffer is totally outside, which means we search for it */
572 /* now we can assume that the start is *before* the current mmap region */
573 /* if the readend is past mapstart, we have two options */
574 } else if (readend >= mapstart) {
575 /* either the read buffer overlaps the start of the mmap region */
576 /* or the read buffer fully contains the current mmap region */
577 /* either way, it's really not relevant, we just create a new region anyway*/
578 fs_print ("read buf %llu+%d starts before mapbuf %d+%d, but overlaps it\n",
579 src->curoffset,readsize, mapstart, mapsize);
580 buf = gst_filesrc_map_small_region (src, src->curoffset, readsize);
585 /* then deal with the case where the read buffer is totally outside */
587 /* first check to see if there's a map that covers the right region already */
588 fs_print ("searching for mapbuf to cover %llu+%d\n",src->curoffset,readsize);
589 region.offset = src->curoffset;
590 region.size = readsize;
591 map = g_tree_search (src->map_regions,
592 (GCompareFunc) gst_filesrc_search_region_match,
595 /* if we found an exact match, subbuffer it */
597 fs_print ("found mapbuf at %d+%d, creating subbuffer\n",GST_BUFFER_OFFSET(map),GST_BUFFER_SIZE(map));
598 buf = gst_buffer_create_sub (map, src->curoffset - GST_BUFFER_OFFSET(map), readsize);
599 GST_BUFFER_OFFSET (buf) = src->curoffset;
601 /* otherwise we need to create something out of thin air */
603 /* if the read buffer crosses a mmap region boundary, create a one-off region */
604 if ((src->curoffset / src->mapsize) != (readend / src->mapsize)) {
605 fs_print ("read buf %llu+%d crosses a %d-byte boundary, creating a one-off\n",
606 src->curoffset,readsize,src->mapsize);
607 buf = gst_filesrc_map_small_region (src, src->curoffset, readsize);
611 /* otherwise we will create a new mmap region and set it to the default */
615 off_t nextmap = src->curoffset - (src->curoffset % src->mapsize);
616 fs_print ("read buf %llu+%d in new mapbuf at %llu+%d, mapping and subbuffering\n",
617 src->curoffset, readsize, nextmap, src->mapsize);
618 /* first, we're done with the old mapbuf */
619 gst_buffer_unref(src->mapbuf);
620 mapsize = src->mapsize;
622 /* double the mapsize as long as the readsize is smaller */
623 while (readsize - (src->curoffset - nextmap) > mapsize) {
624 fs_print ("readsize smaller then mapsize %08x %d\n", readsize, mapsize);
627 /* create a new one */
628 src->mapbuf = gst_filesrc_map_region (src, nextmap, mapsize);
629 if (src->mapbuf == NULL)
633 buf = gst_buffer_create_sub (src->mapbuf, src->curoffset - nextmap, readsize);
634 GST_BUFFER_OFFSET (buf) = mapstart + src->curoffset - nextmap;
639 /* if we need to touch the buffer (to bring it into memory), do so */
641 volatile guchar *p = GST_BUFFER_DATA (buf), c;
643 for (i=0; i < GST_BUFFER_SIZE (buf); i += src->pagesize)
647 /* we're done, return the buffer */
648 src->curoffset += GST_BUFFER_SIZE(buf);
652 /* open the file and mmap it, necessary to go to READY state */
654 gst_filesrc_open_file (GstFileSrc *src)
656 g_return_val_if_fail (!GST_FLAG_IS_SET (src ,GST_FILESRC_OPEN), FALSE);
658 GST_DEBUG ( "opening file %s",src->filename);
661 src->fd = open (src->filename, O_RDONLY);
663 gst_element_error (GST_ELEMENT (src), "opening file \"%s\" (%s)",
664 src->filename, strerror (errno), NULL);
667 /* check if it is a regular file, otherwise bail out */
668 struct stat stat_results;
670 fstat(src->fd, &stat_results);
672 if (!S_ISREG(stat_results.st_mode)) {
673 gst_element_error (GST_ELEMENT (src), "opening file \"%s\" failed. it isn't a regular file",
674 src->filename, NULL);
679 /* find the file length */
680 src->filelen = lseek (src->fd, 0, SEEK_END);
681 lseek (src->fd, 0, SEEK_SET);
683 /* allocate the first mmap'd region */
684 src->mapbuf = gst_filesrc_map_region (src, 0, src->mapsize);
685 if (src->mapbuf == NULL)
690 GST_FLAG_SET (src, GST_FILESRC_OPEN);
695 /* unmap and close the file */
697 gst_filesrc_close_file (GstFileSrc *src)
699 g_return_if_fail (GST_FLAG_IS_SET (src, GST_FILESRC_OPEN));
704 /* zero out a lot of our state */
710 gst_buffer_unref (src->mapbuf);
714 GST_FLAG_UNSET (src, GST_FILESRC_OPEN);
718 static GstElementStateReturn
719 gst_filesrc_change_state (GstElement *element)
721 GstFileSrc *src = GST_FILESRC(element);
723 switch (GST_STATE_TRANSITION (element)) {
724 case GST_STATE_NULL_TO_READY:
726 case GST_STATE_READY_TO_NULL:
728 case GST_STATE_READY_TO_PAUSED:
729 if (!GST_FLAG_IS_SET (element, GST_FILESRC_OPEN)) {
730 if (!gst_filesrc_open_file (GST_FILESRC (element)))
731 return GST_STATE_FAILURE;
734 case GST_STATE_PAUSED_TO_READY:
735 if (GST_FLAG_IS_SET (element, GST_FILESRC_OPEN))
736 gst_filesrc_close_file (GST_FILESRC (element));
737 src->seek_happened = TRUE;
743 if (GST_ELEMENT_CLASS (parent_class)->change_state)
744 return GST_ELEMENT_CLASS (parent_class)->change_state (element);
746 return GST_STATE_SUCCESS;
750 gst_filesrc_srcpad_query (GstPad *pad, GstQueryType type,
751 GstFormat *format, gint64 *value)
753 GstFileSrc *src = GST_FILESRC (GST_PAD_PARENT (pad));
756 case GST_QUERY_TOTAL:
757 if (*format != GST_FORMAT_BYTES) {
760 *value = src->filelen;
762 case GST_QUERY_POSITION:
764 case GST_FORMAT_BYTES:
765 *value = src->curoffset;
767 case GST_FORMAT_PERCENT:
768 if (src->filelen == 0)
770 *value = src->curoffset * GST_FORMAT_PERCENT_MAX / src->filelen;
784 gst_filesrc_srcpad_event (GstPad *pad, GstEvent *event)
786 GstFileSrc *src = GST_FILESRC (GST_PAD_PARENT (pad));
788 GST_DEBUG ( "event %d", GST_EVENT_TYPE (event));
790 switch (GST_EVENT_TYPE (event)) {
795 if (GST_EVENT_SEEK_FORMAT (event) != GST_FORMAT_BYTES) {
799 offset = GST_EVENT_SEEK_OFFSET (event);
801 switch (GST_EVENT_SEEK_METHOD (event)) {
802 case GST_SEEK_METHOD_SET:
803 if (offset > src->filelen)
805 src->curoffset = offset;
806 GST_DEBUG ( "seek set pending to %" G_GINT64_FORMAT, src->curoffset);
808 case GST_SEEK_METHOD_CUR:
809 if (offset + src->curoffset > src->filelen)
811 src->curoffset += offset;
812 GST_DEBUG ( "seek cur pending to %" G_GINT64_FORMAT, src->curoffset);
814 case GST_SEEK_METHOD_END:
815 if (ABS (offset) > src->filelen)
817 src->curoffset = src->filelen - ABS (offset);
818 GST_DEBUG ( "seek end pending to %" G_GINT64_FORMAT, src->curoffset);
824 src->seek_happened = TRUE;
825 src->need_flush = GST_EVENT_SEEK_FLAGS(event) & GST_SEEK_FLAG_FLUSH;
829 if (GST_EVENT_SIZE_FORMAT (event) != GST_FORMAT_BYTES) {
832 src->block_size = GST_EVENT_SIZE_VALUE (event);
833 g_object_notify (G_OBJECT (src), "blocksize");
835 case GST_EVENT_FLUSH:
836 src->need_flush = TRUE;
842 gst_event_unref (event);
846 gst_event_unref (event);