static GstBuffer *
gst_file_src_map_region (GstFileSrc * src, off_t offset, gsize size,
gboolean testonly)
{
GstBuffer *buf;
void *mmapregion;
g_return_val_if_fail (offset >= 0, NULL);
/* FIXME ? use goffset and friends if we require glib >= 2.20 */
GST_LOG_OBJECT (src, "mapping region %08" G_GINT64_MODIFIER "x+%08lx "
"from file into memory", (gint64) offset, (gulong) size);
mmapregion = mmap (NULL, size, PROT_READ, MAP_SHARED, src->fd, offset);
if (mmapregion == NULL || mmapregion == MAP_FAILED)
goto mmap_failed;
GST_LOG_OBJECT (src, "mapped region %08lx+%08lx from file into memory at %p",
(gulong) offset, (gulong) size, mmapregion);
/* time to allocate a new mapbuf */
buf = (GstBuffer *) gst_mini_object_new (GST_TYPE_MMAP_BUFFER);
/* mmap() the data into this new buffer */
GST_BUFFER_DATA (buf) = mmapregion;
GST_MMAP_BUFFER (buf)->filesrc = src;
#ifdef MADV_SEQUENTIAL
if (src->sequential) {
/* madvise to tell the kernel what to do with it */
if (madvise (mmapregion, size, MADV_SEQUENTIAL) < 0) {
GST_WARNING_OBJECT (src, "warning: madvise failed: %s",
g_strerror (errno));
}
}
#endif
/* fill in the rest of the fields */
GST_BUFFER_SIZE (buf) = size;
GST_BUFFER_OFFSET (buf) = offset;
GST_BUFFER_OFFSET_END (buf) = offset + size;
GST_BUFFER_TIMESTAMP (buf) = GST_CLOCK_TIME_NONE;
return buf;
/* ERROR */
mmap_failed:
{
if (!testonly) {
GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),
("mmap (0x%08lx, %d, 0x%" G_GINT64_MODIFIER "x) failed: %s",
(gulong) size, src->fd, (guint64) offset, g_strerror (errno)));
}
return NULL;
}
}
static GstBuffer *
gst_file_src_map_region (GstFileSrc * src, off_t offset, gsize size,
gboolean testonly)
{
GstBuffer *buf;
void *mmapregion;
g_return_val_if_fail (offset >= 0, NULL);
GST_LOG_OBJECT (src, "mapping region %08llx+%08lx from file into memory",
offset, (gulong) size);
mmapregion = mmap (NULL, size, PROT_READ, MAP_SHARED, src->fd, offset);
if (mmapregion == NULL || mmapregion == MAP_FAILED)
goto mmap_failed;
GST_LOG_OBJECT (src, "mapped region %08lx+%08lx from file into memory at %p",
(gulong) offset, (gulong) size, mmapregion);
/* time to allocate a new mapbuf */
buf = (GstBuffer *) gst_mini_object_new (GST_TYPE_MMAP_BUFFER);
/* mmap() the data into this new buffer */
GST_BUFFER_DATA (buf) = mmapregion;
GST_MMAP_BUFFER (buf)->filesrc = src;
#ifdef MADV_SEQUENTIAL
if (src->sequential) {
/* madvise to tell the kernel what to do with it */
#ifndef __SYMBIAN32__
if (madvise (mmapregion, size, MADV_SEQUENTIAL) < 0) {
GST_WARNING_OBJECT (src, "warning: madvise failed: %s",
g_strerror (errno));
}
#endif
#endif
/* fill in the rest of the fields */
GST_BUFFER_SIZE (buf) = size;
GST_BUFFER_OFFSET (buf) = offset;
GST_BUFFER_OFFSET_END (buf) = offset + size;
GST_BUFFER_TIMESTAMP (buf) = GST_CLOCK_TIME_NONE;
return buf;
/* ERROR */
mmap_failed:
{
if (!testonly) {
GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),
("mmap (0x%08lx, %d, 0x%" G_GINT64_MODIFIER "x) failed: %s",
(gulong) size, src->fd, (guint64) offset, g_strerror (errno)));
}
return NULL;
}
}
static GstBuffer *
gst_file_src_map_small_region (GstFileSrc * src, off_t offset, gsize size)
{
GstBuffer *ret;
off_t mod;
guint pagesize;
GST_LOG_OBJECT (src,
"attempting to map a small buffer at %" G_GUINT64_FORMAT "+%d",
(guint64) offset, (gint) size);
pagesize = src->pagesize;
mod = offset % pagesize;
/* if the offset starts at a non-page boundary, we have to special case */
if (mod != 0) {
gsize mapsize;
off_t mapbase;
GstBuffer *map;
mapbase = offset - mod;
mapsize = ((size + mod + pagesize - 1) / pagesize) * pagesize;
GST_LOG_OBJECT (src,
"not on page boundaries, resizing to map to %" G_GUINT64_FORMAT "+%d",
(guint64) mapbase, (gint) mapsize);
map = gst_file_src_map_region (src, mapbase, mapsize, FALSE);
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);
} else {
ret = gst_file_src_map_region (src, offset, size, FALSE);
}
return ret;
}
