gstreamer/plugins/elements/gstfilesrc.c
Benjamin Otte 907e3e97d9 update plugin initialization restructuring (see email for details
Original commit message from CVS:
update plugin initialization restructuring (see email for details
2003-10-31 19:32:47 +00:00

890 lines
28 KiB
C

/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gstfilesrc.c:
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <gst/gst.h>
#include "gstfilesrc.h"
#include <stdio.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <errno.h>
#include <string.h>
/**********************************************************************
* GStreamer Default File Source
* Theory of Operation
*
* This source uses mmap(2) to efficiently load data from a file.
* To do this without seriously polluting the applications' memory
* space, it must do so in smaller chunks, say 1-4MB at a time.
* Buffers are then subdivided from these mmap'd chunks, to directly
* make use of the mmap.
*
* To handle refcounting so that the mmap can be freed at the appropriate
* time, a buffer will be created for each mmap'd region, and all new
* buffers will be sub-buffers of this top-level buffer. As they are
* freed, the refcount goes down on the mmap'd buffer and its free()
* function is called, which will call munmap(2) on itself.
*
* If a buffer happens to cross the boundaries of an mmap'd region, we
* have to decide whether it's more efficient to copy the data into a
* new buffer, or mmap() just that buffer. There will have to be a
* breakpoint size to determine which will be done. The mmap() size
* has a lot to do with this as well, because you end up in double-
* jeopardy: the larger the outgoing buffer, the more data to copy when
* it overlaps, *and* the more frequently you'll have buffers that *do*
* overlap.
*
* Seeking is another tricky aspect to do efficiently. The initial
* implementation of this source won't make use of these features, however.
* The issue is that if an application seeks backwards in a file, *and*
* that region of the file is covered by an mmap that hasn't been fully
* deallocated, we really should re-use it. But keeping track of these
* regions is tricky because we have to lock the structure that holds
* them. We need to settle on a locking primitive (GMutex seems to be
* a really good option...), then we can do that.
*/
GST_DEBUG_CATEGORY_STATIC (gst_filesrc_debug);
#define GST_CAT_DEFAULT gst_filesrc_debug
GstElementDetails gst_filesrc_details = GST_ELEMENT_DETAILS (
"File Source",
"Source/File",
"Read from arbitrary point in a file",
"Erik Walthinsen <omega@cse.ogi.edu>"
);
#define DEFAULT_BLOCKSIZE 4*1024
#define DEFAULT_MMAPSIZE 4*1024*1024
/* FileSrc signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
ARG_LOCATION,
ARG_FD,
ARG_BLOCKSIZE,
ARG_MMAPSIZE,
ARG_TOUCH,
};
GST_PAD_EVENT_MASK_FUNCTION (gst_filesrc_get_event_mask,
{ GST_EVENT_SEEK, GST_SEEK_METHOD_CUR |
GST_SEEK_METHOD_SET |
GST_SEEK_METHOD_END |
GST_SEEK_FLAG_FLUSH },
{ GST_EVENT_FLUSH, 0 },
{ GST_EVENT_SIZE, 0 }
)
GST_PAD_QUERY_TYPE_FUNCTION (gst_filesrc_get_query_types,
GST_QUERY_TOTAL,
GST_QUERY_POSITION
)
GST_PAD_FORMATS_FUNCTION (gst_filesrc_get_formats,
GST_FORMAT_BYTES
)
static void gst_filesrc_base_init (gpointer g_class);
static void gst_filesrc_class_init (GstFileSrcClass *klass);
static void gst_filesrc_init (GstFileSrc *filesrc);
static void gst_filesrc_dispose (GObject *object);
static void gst_filesrc_set_property (GObject *object, guint prop_id,
const GValue *value, GParamSpec *pspec);
static void gst_filesrc_get_property (GObject *object, guint prop_id,
GValue *value, GParamSpec *pspec);
static GstData * gst_filesrc_get (GstPad *pad);
static gboolean gst_filesrc_srcpad_event (GstPad *pad, GstEvent *event);
static gboolean gst_filesrc_srcpad_query (GstPad *pad, GstQueryType type,
GstFormat *format, gint64 *value);
static GstElementStateReturn gst_filesrc_change_state (GstElement *element);
static GstElementClass *parent_class = NULL;
/*static guint gst_filesrc_signals[LAST_SIGNAL] = { 0 };*/
GType
gst_filesrc_get_type(void)
{
static GType filesrc_type = 0;
if (!filesrc_type) {
static const GTypeInfo filesrc_info = {
sizeof(GstFileSrcClass),
gst_filesrc_base_init,
NULL,
(GClassInitFunc)gst_filesrc_class_init,
NULL,
NULL,
sizeof(GstFileSrc),
0,
(GInstanceInitFunc)gst_filesrc_init,
};
filesrc_type = g_type_register_static (GST_TYPE_ELEMENT, "GstFileSrc", &filesrc_info, 0);
GST_DEBUG_CATEGORY_INIT (gst_filesrc_debug, "filesrc", 0, "filesrc element");
}
return filesrc_type;
}
static void
gst_filesrc_base_init (gpointer g_class)
{
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details (gstelement_class, &gst_filesrc_details);
}
static void
gst_filesrc_class_init (GstFileSrcClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
gobject_class = (GObjectClass*)klass;
parent_class = g_type_class_peek_parent (klass);
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_FD,
g_param_spec_int ("fd", "File-descriptor", "File-descriptor for the file being mmap()d",
0, G_MAXINT, 0, G_PARAM_READABLE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_LOCATION,
g_param_spec_string ("location", "File Location", "Location of the file to read",
NULL, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BLOCKSIZE,
g_param_spec_ulong ("blocksize", "Block size", "Size in bytes to read per buffer",
1, G_MAXULONG, DEFAULT_BLOCKSIZE, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_MMAPSIZE,
g_param_spec_ulong ("mmapsize", "mmap() Block Size",
"Size in bytes of mmap()d regions",
0, G_MAXULONG, DEFAULT_MMAPSIZE, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_TOUCH,
g_param_spec_boolean ("touch", "Touch read data",
"Touch data to force disk read",
FALSE, G_PARAM_READWRITE));
gobject_class->dispose = gst_filesrc_dispose;
gobject_class->set_property = gst_filesrc_set_property;
gobject_class->get_property = gst_filesrc_get_property;
gstelement_class->change_state = gst_filesrc_change_state;
}
static gint
gst_filesrc_bufcmp (gconstpointer a, gconstpointer b)
{
/* GstBuffer *bufa = (GstBuffer *)a, *bufb = (GstBuffer *)b;*/
/* sort first by offset, then in reverse by size */
if (GST_BUFFER_OFFSET(a) < GST_BUFFER_OFFSET(b)) return -1;
else if (GST_BUFFER_OFFSET(a) > GST_BUFFER_OFFSET(b)) return 1;
else if (GST_BUFFER_SIZE(a) > GST_BUFFER_SIZE(b)) return -1;
else if (GST_BUFFER_SIZE(a) < GST_BUFFER_SIZE(b)) return 1;
else return 0;
}
static void
gst_filesrc_init (GstFileSrc *src)
{
src->srcpad = gst_pad_new ("src", GST_PAD_SRC);
gst_pad_set_get_function (src->srcpad, gst_filesrc_get);
gst_pad_set_event_function (src->srcpad, gst_filesrc_srcpad_event);
gst_pad_set_event_mask_function (src->srcpad, gst_filesrc_get_event_mask);
gst_pad_set_query_function (src->srcpad, gst_filesrc_srcpad_query);
gst_pad_set_query_type_function (src->srcpad, gst_filesrc_get_query_types);
gst_pad_set_formats_function (src->srcpad, gst_filesrc_get_formats);
gst_element_add_pad (GST_ELEMENT (src), src->srcpad);
src->pagesize = getpagesize();
src->filename = NULL;
src->fd = 0;
src->filelen = 0;
src->curoffset = 0;
src->block_size = DEFAULT_BLOCKSIZE;
src->touch = FALSE;
src->mapbuf = NULL;
src->mapsize = DEFAULT_MMAPSIZE; /* default is 4MB */
src->map_regions = g_tree_new (gst_filesrc_bufcmp);
src->map_regions_lock = g_mutex_new();
src->seek_happened = FALSE;
}
static void
gst_filesrc_dispose (GObject *object)
{
GstFileSrc *src;
src = GST_FILESRC (object);
G_OBJECT_CLASS (parent_class)->dispose (object);
g_tree_destroy (src->map_regions);
g_mutex_free (src->map_regions_lock);
if (src->filename)
g_free (src->filename);
}
static void
gst_filesrc_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
GstFileSrc *src;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_FILESRC (object));
src = GST_FILESRC (object);
switch (prop_id) {
case ARG_LOCATION:
/* the element must be stopped in order to do this */
g_return_if_fail (GST_STATE (src) < GST_STATE_PLAYING);
if (src->filename) g_free (src->filename);
/* clear the filename if we get a NULL (is that possible?) */
if (g_value_get_string (value) == NULL) {
gst_element_set_state (GST_ELEMENT (object), GST_STATE_NULL);
src->filename = NULL;
/* otherwise set the new filename */
} else {
src->filename = g_strdup (g_value_get_string (value));
}
g_object_notify (G_OBJECT (src), "location");
break;
case ARG_BLOCKSIZE:
src->block_size = g_value_get_ulong (value);
g_object_notify (G_OBJECT (src), "blocksize");
break;
case ARG_MMAPSIZE:
if ((src->mapsize % src->pagesize) == 0) {
src->mapsize = g_value_get_ulong (value);
g_object_notify (G_OBJECT (src), "mmapsize");
} else {
GST_INFO_OBJECT (src, "invalid mapsize, must a multiple of pagesize, which is %d",
src->pagesize);
}
break;
case ARG_TOUCH:
src->touch = g_value_get_boolean (value);
g_object_notify (G_OBJECT (src), "touch");
break;
default:
break;
}
}
static void
gst_filesrc_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
GstFileSrc *src;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_FILESRC (object));
src = GST_FILESRC (object);
switch (prop_id) {
case ARG_LOCATION:
g_value_set_string (value, src->filename);
break;
case ARG_FD:
g_value_set_int (value, src->fd);
break;
case ARG_BLOCKSIZE:
g_value_set_ulong (value, src->block_size);
break;
case ARG_MMAPSIZE:
g_value_set_ulong (value, src->mapsize);
break;
case ARG_TOUCH:
g_value_set_boolean (value, src->touch);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_filesrc_free_parent_mmap (GstBuffer *buf)
{
GstFileSrc *src = GST_FILESRC (GST_BUFFER_POOL_PRIVATE (buf));
GST_LOG_OBJECT (src, "freeing mmap()d buffer at %"G_GUINT64_FORMAT"+%u",
GST_BUFFER_OFFSET (buf), GST_BUFFER_SIZE (buf));
/* remove the buffer from the list of available mmap'd regions */
g_mutex_lock (src->map_regions_lock);
g_tree_remove (src->map_regions, buf);
/* check to see if the tree is empty */
if (g_tree_nnodes (src->map_regions) == 0) {
/* we have to free the bufferpool we don't have yet */
}
g_mutex_unlock (src->map_regions_lock);
#ifdef MADV_DONTNEED
/* madvise to tell the kernel what to do with it */
madvise (GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf), MADV_DONTNEED);
#endif
/* now unmap the memory */
munmap (GST_BUFFER_DATA (buf), GST_BUFFER_MAXSIZE (buf));
/* cast to unsigned long, since there's no gportable way to print
* guint64 as hex */
GST_LOG_OBJECT (src, "unmapped region %08lx+%08lx at %p",
(unsigned long) GST_BUFFER_OFFSET (buf),
(unsigned long) GST_BUFFER_MAXSIZE (buf),
GST_BUFFER_DATA (buf));
GST_BUFFER_DATA (buf) = NULL;
g_object_unref (src);
gst_buffer_default_free (buf);
}
static GstBuffer *
gst_filesrc_map_region (GstFileSrc *src, off_t offset, size_t size)
{
GstBuffer *buf;
gint retval;
void *mmapregion;
g_return_val_if_fail (offset >= 0, NULL);
GST_LOG_OBJECT (src, "mapping region %08llx+%08lx from file into memory",offset,(unsigned long)size);
mmapregion = mmap (NULL, size, PROT_READ, MAP_SHARED, src->fd, offset);
if (mmapregion == NULL) {
gst_element_error (GST_ELEMENT (src), "couldn't map file");
return NULL;
}
else if (mmapregion == MAP_FAILED) {
GST_WARNING_OBJECT (src, "mmap (0x%08lx, %d, 0x%llx) failed: %s",
(unsigned long)size, src->fd, offset, strerror (errno));
return NULL;
}
GST_LOG_OBJECT (src, "mapped region %08lx+%08lx from file into memory at %p",
(unsigned long)offset, (unsigned long)size, mmapregion);
/* time to allocate a new mapbuf */
buf = gst_buffer_new ();
/* mmap() the data into this new buffer */
GST_BUFFER_DATA (buf) = mmapregion;
#ifdef MADV_SEQUENTIAL
/* madvise to tell the kernel what to do with it */
retval = madvise (GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf), MADV_SEQUENTIAL);
#endif
/* fill in the rest of the fields */
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_READONLY);
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_ORIGINAL);
GST_BUFFER_SIZE (buf) = size;
GST_BUFFER_MAXSIZE (buf) = size;
GST_BUFFER_OFFSET (buf) = offset;
GST_BUFFER_TIMESTAMP (buf) = GST_CLOCK_TIME_NONE;
GST_BUFFER_POOL_PRIVATE (buf) = src;
g_object_ref (src);
GST_BUFFER_FREE_FUNC (buf) = (GstDataFreeFunction) gst_filesrc_free_parent_mmap;
g_mutex_lock (src->map_regions_lock);
g_tree_insert (src->map_regions,buf,buf);
g_mutex_unlock (src->map_regions_lock);
return buf;
}
static GstBuffer *
gst_filesrc_map_small_region (GstFileSrc *src, off_t offset, size_t size)
{
size_t mapsize;
off_t mod, mapbase;
GstBuffer *map;
/* printf("attempting to map a small buffer at %d+%d\n",offset,size); */
/* if the offset starts at a non-page boundary, we have to special case */
if ((mod = offset % src->pagesize)) {
GstBuffer *ret;
mapbase = offset - mod;
mapsize = ((size + mod + src->pagesize - 1) / src->pagesize) * src->pagesize;
/* printf("not on page boundaries, resizing map to %d+%d\n",mapbase,mapsize);*/
map = gst_filesrc_map_region(src, mapbase, mapsize);
if (map == NULL)
return NULL;
ret = gst_buffer_create_sub (map, offset - mapbase, size);
GST_BUFFER_OFFSET (ret) = GST_BUFFER_OFFSET (map) + offset - mapbase;
gst_buffer_unref (map);
return ret;
}
return gst_filesrc_map_region(src,offset,size);
}
typedef struct {
off_t offset;
off_t size;
} GstFileSrcRegion;
/* This allows us to search for a potential mmap region. */
static gint
gst_filesrc_search_region_match (gpointer a, gpointer b)
{
GstFileSrcRegion *r = (GstFileSrcRegion *)b;
/* trying to walk b down the tree, current node is a */
if (r->offset < GST_BUFFER_OFFSET(a)) return -1;
else if (r->offset >= (GST_BUFFER_OFFSET(a) + GST_BUFFER_SIZE(a))) return 1;
else if ((r->offset + r->size) <= (GST_BUFFER_OFFSET(a) + GST_BUFFER_SIZE(a))) return 0;
return -2;
}
/**
* gst_filesrc_get_mmap:
* @pad: #GstPad to push a buffer from
*
* Push a new buffer from the filesrc at the current offset.
*/
static GstBuffer *
gst_filesrc_get_mmap (GstFileSrc *src)
{
GstBuffer *buf = NULL, *map;
size_t readsize, mapsize;
off_t readend,mapstart,mapend;
GstFileSrcRegion region;
int i;
/* calculate end pointers so we don't have to do so repeatedly later */
readsize = src->block_size;
readend = src->curoffset + src->block_size; /* note this is the byte *after* the read */
mapstart = GST_BUFFER_OFFSET (src->mapbuf);
mapsize = GST_BUFFER_SIZE (src->mapbuf);
mapend = mapstart + mapsize; /* note this is the byte *after* the map */
/* check to see if we're going to overflow the end of the file */
if (readend > src->filelen) {
readsize = src->filelen - src->curoffset;
readend = src->curoffset + readsize;
}
GST_LOG ("attempting to read %08lx, %08lx, %08lx, %08lx",
(unsigned long)readsize, (unsigned long)readend,
(unsigned long)mapstart, (unsigned long)mapend);
/* if the start is past the mapstart */
if (src->curoffset >= mapstart) {
/* if the end is before the mapend, the buffer is in current mmap region... */
/* ('cause by definition if readend is in the buffer, so's readstart) */
if (readend <= mapend) {
GST_LOG_OBJECT (src, "read buf %llu+%d lives in current mapbuf %lld+%d, creating subbuffer of mapbuf",
src->curoffset, readsize, mapstart, mapsize);
buf = gst_buffer_create_sub (src->mapbuf, src->curoffset - mapstart,
readsize);
GST_BUFFER_OFFSET (buf) = src->curoffset;
/* if the start actually is within the current mmap region, map an overlap buffer */
} else if (src->curoffset < mapend) {
GST_LOG_OBJECT (src, "read buf %llu+%d starts in mapbuf %d+%d but ends outside, creating new mmap",
(unsigned long long) src->curoffset, (gint) readsize, (gint) mapstart, (gint) mapsize);
buf = gst_filesrc_map_small_region (src, src->curoffset, readsize);
if (buf == NULL)
return NULL;
}
/* the only other option is that buffer is totally outside, which means we search for it */
/* now we can assume that the start is *before* the current mmap region */
/* if the readend is past mapstart, we have two options */
} else if (readend >= mapstart) {
/* either the read buffer overlaps the start of the mmap region */
/* or the read buffer fully contains the current mmap region */
/* either way, it's really not relevant, we just create a new region anyway*/
GST_LOG_OBJECT (src, "read buf %llu+%d starts before mapbuf %d+%d, but overlaps it",
(unsigned long long) src->curoffset, (gint) readsize, (gint) mapstart, (gint) mapsize);
buf = gst_filesrc_map_small_region (src, src->curoffset, readsize);
if (buf == NULL)
return NULL;
}
/* then deal with the case where the read buffer is totally outside */
if (buf == NULL) {
/* first check to see if there's a map that covers the right region already */
GST_LOG_OBJECT (src, "searching for mapbuf to cover %llu+%d",src->curoffset,readsize);
region.offset = src->curoffset;
region.size = readsize;
map = g_tree_search (src->map_regions,
(GCompareFunc) gst_filesrc_search_region_match,
(gpointer)&region);
/* if we found an exact match, subbuffer it */
if (map != NULL) {
GST_LOG_OBJECT (src, "found mapbuf at %"G_GUINT64_FORMAT"+%u, creating subbuffer",
GST_BUFFER_OFFSET (map), GST_BUFFER_SIZE (map));
buf = gst_buffer_create_sub (map, src->curoffset - GST_BUFFER_OFFSET(map), readsize);
GST_BUFFER_OFFSET (buf) = src->curoffset;
/* otherwise we need to create something out of thin air */
} else {
/* if the read buffer crosses a mmap region boundary, create a one-off region */
if ((src->curoffset / src->mapsize) != (readend / src->mapsize)) {
GST_LOG_OBJECT (src, "read buf %llu+%d crosses a %d-byte boundary, creating a one-off",
src->curoffset,readsize,src->mapsize);
buf = gst_filesrc_map_small_region (src, src->curoffset, readsize);
if (buf == NULL)
return NULL;
/* otherwise we will create a new mmap region and set it to the default */
} else {
size_t mapsize;
off_t nextmap = src->curoffset - (src->curoffset % src->mapsize);
GST_LOG_OBJECT (src, "read buf %llu+%d in new mapbuf at %llu+%d, mapping and subbuffering",
src->curoffset, readsize, nextmap, src->mapsize);
/* first, we're done with the old mapbuf */
gst_buffer_unref(src->mapbuf);
mapsize = src->mapsize;
/* double the mapsize as long as the readsize is smaller */
while (readsize - (src->curoffset - nextmap) > mapsize) {
GST_LOG_OBJECT (src, "readsize smaller then mapsize %08x %d", readsize, mapsize);
mapsize <<=1;
}
/* create a new one */
src->mapbuf = gst_filesrc_map_region (src, nextmap, mapsize);
if (src->mapbuf == NULL)
return NULL;
/* subbuffer it */
buf = gst_buffer_create_sub (src->mapbuf, src->curoffset - nextmap, readsize);
GST_BUFFER_OFFSET (buf) = mapstart + src->curoffset - nextmap;
}
}
}
/* if we need to touch the buffer (to bring it into memory), do so */
if (src->touch) {
volatile guchar *p = GST_BUFFER_DATA (buf), c;
for (i=0; i < GST_BUFFER_SIZE (buf); i += src->pagesize)
c = p[i];
}
/* we're done, return the buffer */
src->curoffset += GST_BUFFER_SIZE(buf);
return buf;
}
static GstBuffer *
gst_filesrc_get_read (GstFileSrc *src)
{
GstBuffer *buf = NULL;
size_t readsize;
int ret;
readsize = src->block_size;
if (src->curoffset + readsize > src->filelen) {
readsize = src->filelen - src->curoffset;
}
buf = gst_buffer_new_and_alloc (readsize);
g_return_val_if_fail (buf != NULL, NULL);
ret = read (src->fd, GST_BUFFER_DATA (buf), readsize);
if (ret < 0){
gst_element_error (GST_ELEMENT (src), "reading file (%s)",
strerror (errno), NULL);
return NULL;
}
if (ret < readsize) {
gst_element_error (GST_ELEMENT (src), "unexpected end of file", NULL);
return NULL;
}
src->curoffset += readsize;
return buf;
}
static GstData *
gst_filesrc_get (GstPad *pad)
{
GstFileSrc *src;
g_return_val_if_fail (pad != NULL, NULL);
src = GST_FILESRC (gst_pad_get_parent (pad));
g_return_val_if_fail (GST_FLAG_IS_SET (src, GST_FILESRC_OPEN), NULL);
/* check for seek */
if (src->seek_happened) {
GstEvent *event;
src->seek_happened = FALSE;
GST_DEBUG_OBJECT (src, "sending discont");
event = gst_event_new_discontinuous (FALSE, GST_FORMAT_BYTES, src->curoffset, NULL);
src->need_flush = FALSE;
return GST_DATA (event);
}
/* check for flush */
if (src->need_flush) {
src->need_flush = FALSE;
GST_DEBUG_OBJECT (src, "sending flush");
return GST_DATA (gst_event_new_flush ());
}
/* check for EOF */
if (src->curoffset == src->filelen) {
GST_DEBUG_OBJECT (src, "eos %" G_GINT64_FORMAT" %" G_GINT64_FORMAT,
src->curoffset, src->filelen);
gst_element_set_eos (GST_ELEMENT (src));
return GST_DATA (gst_event_new (GST_EVENT_EOS));
}
if (src->using_mmap){
return GST_DATA (gst_filesrc_get_mmap (src));
}else{
return GST_DATA (gst_filesrc_get_read (src));
}
}
/* open the file and mmap it, necessary to go to READY state */
static gboolean
gst_filesrc_open_file (GstFileSrc *src)
{
g_return_val_if_fail (!GST_FLAG_IS_SET (src ,GST_FILESRC_OPEN), FALSE);
GST_INFO_OBJECT (src, "opening file %s",src->filename);
/* open the file */
src->fd = open (src->filename, O_RDONLY);
if (src->fd < 0) {
gst_element_error (GST_ELEMENT (src), "opening file \"%s\" (%s)",
src->filename, strerror (errno), NULL);
return FALSE;
} else {
/* check if it is a regular file, otherwise bail out */
struct stat stat_results;
fstat(src->fd, &stat_results);
if (!S_ISREG(stat_results.st_mode)) {
gst_element_error (GST_ELEMENT (src), "opening file \"%s\" failed. it isn't a regular file",
src->filename, NULL);
close(src->fd);
return FALSE;
}
/* find the file length */
src->filelen = stat_results.st_size;
/* allocate the first mmap'd region */
src->mapbuf = gst_filesrc_map_region (src, 0, src->mapsize);
if (src->mapbuf == NULL) {
src->using_mmap = FALSE;
}else{
src->using_mmap = TRUE;
}
src->curoffset = 0;
GST_FLAG_SET (src, GST_FILESRC_OPEN);
}
return TRUE;
}
/* unmap and close the file */
static void
gst_filesrc_close_file (GstFileSrc *src)
{
g_return_if_fail (GST_FLAG_IS_SET (src, GST_FILESRC_OPEN));
/* close the file */
close (src->fd);
/* zero out a lot of our state */
src->fd = 0;
src->filelen = 0;
src->curoffset = 0;
if (src->mapbuf) {
gst_buffer_unref (src->mapbuf);
src->mapbuf = NULL;
}
GST_FLAG_UNSET (src, GST_FILESRC_OPEN);
}
static GstElementStateReturn
gst_filesrc_change_state (GstElement *element)
{
GstFileSrc *src = GST_FILESRC(element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_NULL_TO_READY:
break;
case GST_STATE_READY_TO_NULL:
break;
case GST_STATE_READY_TO_PAUSED:
if (!GST_FLAG_IS_SET (element, GST_FILESRC_OPEN)) {
if (!gst_filesrc_open_file (GST_FILESRC (element)))
return GST_STATE_FAILURE;
}
break;
case GST_STATE_PAUSED_TO_READY:
if (GST_FLAG_IS_SET (element, GST_FILESRC_OPEN))
gst_filesrc_close_file (GST_FILESRC (element));
src->seek_happened = TRUE;
break;
default:
break;
}
if (GST_ELEMENT_CLASS (parent_class)->change_state)
return GST_ELEMENT_CLASS (parent_class)->change_state (element);
return GST_STATE_SUCCESS;
}
static gboolean
gst_filesrc_srcpad_query (GstPad *pad, GstQueryType type,
GstFormat *format, gint64 *value)
{
GstFileSrc *src = GST_FILESRC (GST_PAD_PARENT (pad));
switch (type) {
case GST_QUERY_TOTAL:
if (*format != GST_FORMAT_BYTES) {
return FALSE;
}
*value = src->filelen;
break;
case GST_QUERY_POSITION:
switch (*format) {
case GST_FORMAT_BYTES:
*value = src->curoffset;
break;
case GST_FORMAT_PERCENT:
if (src->filelen == 0)
return FALSE;
*value = src->curoffset * GST_FORMAT_PERCENT_MAX / src->filelen;
break;
default:
return FALSE;
}
break;
default:
return FALSE;
break;
}
return TRUE;
}
static gboolean
gst_filesrc_srcpad_event (GstPad *pad, GstEvent *event)
{
GstFileSrc *src = GST_FILESRC (GST_PAD_PARENT (pad));
GST_DEBUG_OBJECT (src, "event %d", GST_EVENT_TYPE (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:
{
gint64 offset;
if (GST_EVENT_SEEK_FORMAT (event) != GST_FORMAT_BYTES) {
goto error;
}
offset = GST_EVENT_SEEK_OFFSET (event);
switch (GST_EVENT_SEEK_METHOD (event)) {
case GST_SEEK_METHOD_SET:
if (offset > src->filelen)
goto error;
src->curoffset = offset;
GST_DEBUG_OBJECT (src, "seek set pending to %" G_GINT64_FORMAT, src->curoffset);
break;
case GST_SEEK_METHOD_CUR:
if (offset + src->curoffset > src->filelen)
goto error;
src->curoffset += offset;
GST_DEBUG_OBJECT (src, "seek cur pending to %" G_GINT64_FORMAT, src->curoffset);
break;
case GST_SEEK_METHOD_END:
if (ABS (offset) > src->filelen)
goto error;
src->curoffset = src->filelen - ABS (offset);
GST_DEBUG_OBJECT (src, "seek end pending to %" G_GINT64_FORMAT, src->curoffset);
break;
default:
goto error;
break;
}
src->seek_happened = TRUE;
src->need_flush = GST_EVENT_SEEK_FLAGS(event) & GST_SEEK_FLAG_FLUSH;
break;
}
case GST_EVENT_SIZE:
if (GST_EVENT_SIZE_FORMAT (event) != GST_FORMAT_BYTES) {
goto error;
}
src->block_size = GST_EVENT_SIZE_VALUE (event);
g_object_notify (G_OBJECT (src), "blocksize");
break;
case GST_EVENT_FLUSH:
src->need_flush = TRUE;
break;
default:
goto error;
break;
}
gst_event_unref (event);
return TRUE;
error:
gst_event_unref (event);
return FALSE;
}