/* GStreamer * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu> * 2000,2005 Wim Taymans <wim@fluendo.com> * * 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. */ /** * SECTION:element-filesrc * @see_also: #GstFileSrc * * Read data from a file in the local file system. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include <gst/gst.h> #include "gstfilesrc.h" #include <stdio.h> #include <sys/types.h> #ifdef G_OS_WIN32 #include <io.h> /* lseek, open, close, read */ /* On win32, stat* default to 32 bit; we need the 64-bit * variants, so explicitly define it that way. */ #define stat __stat64 #define fstat _fstat64 #undef lseek #define lseek _lseeki64 #undef off_t #define off_t guint64 /* Prevent stat.h from defining the stat* functions as * _stat*, since we're explicitly overriding that */ #undef _INC_STAT_INL #endif #include <sys/stat.h> #include <fcntl.h> #ifdef HAVE_UNISTD_H # include <unistd.h> #endif #ifdef HAVE_MMAP # include <sys/mman.h> #endif #include <errno.h> #include <string.h> #include "../../gst/gst-i18n-lib.h" static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS_ANY); /* FIXME we should be using glib for this */ #ifndef S_ISREG #define S_ISREG(mode) ((mode)&_S_IFREG) #endif #ifndef S_ISDIR #define S_ISDIR(mode) ((mode)&_S_IFDIR) #endif #ifndef S_ISSOCK #define S_ISSOCK(x) (0) #endif #ifndef O_BINARY #define O_BINARY (0) #endif /* Copy of glib's g_open due to win32 libc/cross-DLL brokenness: we can't * use the 'file descriptor' opened in glib (and returned from this function) * in this library, as they may have unrelated C runtimes. */ int gst_open (const gchar * filename, int flags, int mode) { #ifdef G_OS_WIN32 wchar_t *wfilename = g_utf8_to_utf16 (filename, -1, NULL, NULL, NULL); int retval; int save_errno; if (wfilename == NULL) { errno = EINVAL; return -1; } retval = _wopen (wfilename, flags, mode); save_errno = errno; g_free (wfilename); errno = save_errno; return retval; #else return open (filename, flags, mode); #endif } /********************************************************************** * GStreamer Default File Source * Theory of Operation * * Update: see GstFileSrc:use-mmap property documentation below * for why use of mmap() is disabled by default. * * 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_file_src_debug); #define GST_CAT_DEFAULT gst_file_src_debug /* FileSrc signals and args */ enum { /* FILL ME */ LAST_SIGNAL }; #define DEFAULT_BLOCKSIZE 4*1024 #define DEFAULT_MMAPSIZE 4*1024*1024 #define DEFAULT_TOUCH TRUE #define DEFAULT_USEMMAP FALSE #define DEFAULT_SEQUENTIAL FALSE enum { ARG_0, ARG_LOCATION, ARG_FD, ARG_MMAPSIZE, ARG_SEQUENTIAL, ARG_TOUCH, ARG_USEMMAP }; static void gst_file_src_finalize (GObject * object); static void gst_file_src_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_file_src_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static gboolean gst_file_src_start (GstBaseSrc * basesrc); static gboolean gst_file_src_stop (GstBaseSrc * basesrc); static gboolean gst_file_src_is_seekable (GstBaseSrc * src); static gboolean gst_file_src_get_size (GstBaseSrc * src, guint64 * size); static GstFlowReturn gst_file_src_create (GstBaseSrc * src, guint64 offset, guint length, GstBuffer ** buffer); static gboolean gst_file_src_query (GstBaseSrc * src, GstQuery * query); static void gst_file_src_uri_handler_init (gpointer g_iface, gpointer iface_data); static void _do_init (GType filesrc_type) { static const GInterfaceInfo urihandler_info = { gst_file_src_uri_handler_init, NULL, NULL }; g_type_add_interface_static (filesrc_type, GST_TYPE_URI_HANDLER, &urihandler_info); GST_DEBUG_CATEGORY_INIT (gst_file_src_debug, "filesrc", 0, "filesrc element"); } GST_BOILERPLATE_FULL (GstFileSrc, gst_file_src, GstBaseSrc, GST_TYPE_BASE_SRC, _do_init); static void gst_file_src_base_init (gpointer g_class) { GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class); gst_element_class_set_details_simple (gstelement_class, "File Source", "Source/File", "Read from arbitrary point in a file", "Erik Walthinsen <omega@cse.ogi.edu>"); gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&srctemplate)); } static void gst_file_src_class_init (GstFileSrcClass * klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; GstBaseSrcClass *gstbasesrc_class; gobject_class = G_OBJECT_CLASS (klass); gstelement_class = GST_ELEMENT_CLASS (klass); gstbasesrc_class = GST_BASE_SRC_CLASS (klass); gobject_class->set_property = gst_file_src_set_property; gobject_class->get_property = gst_file_src_get_property; g_object_class_install_property (gobject_class, 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_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, ARG_LOCATION, g_param_spec_string ("location", "File Location", "Location of the file to read", NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, 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_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, ARG_TOUCH, g_param_spec_boolean ("touch", "Touch mapped region read data", "Touch mmapped data regions to force them to be read from disk", DEFAULT_TOUCH, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); /** * GstFileSrc:use-mmap * * Whether to use mmap(). Set to TRUE to force use of mmap() instead of * read() for reading data. * * Use of mmap() is disabled by default since with mmap() there are a * number of occasions where the process/application will be notified of * read errors via a SIGBUS signal from the kernel, which will lead to * the application being killed if not handled by the application. This * is something that is difficult to work around for a library like * GStreamer, hence use of mmap() is disabled by default. Said errors * can occur for example when an external device (e.g. an external hard * drive or a portable music player) are unplugged while in use, or when * a CD/DVD medium cannot be be read because the medium is scratched or * otherwise damaged. * **/ g_object_class_install_property (gobject_class, ARG_USEMMAP, g_param_spec_boolean ("use-mmap", "Use mmap to read data", "Whether to use mmap() instead of read()", DEFAULT_USEMMAP, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, ARG_SEQUENTIAL, g_param_spec_boolean ("sequential", "Optimise for sequential mmap access", "Whether to use madvise to hint to the kernel that access to " "mmap pages will be sequential", DEFAULT_SEQUENTIAL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_file_src_finalize); gstbasesrc_class->start = GST_DEBUG_FUNCPTR (gst_file_src_start); gstbasesrc_class->stop = GST_DEBUG_FUNCPTR (gst_file_src_stop); gstbasesrc_class->is_seekable = GST_DEBUG_FUNCPTR (gst_file_src_is_seekable); gstbasesrc_class->get_size = GST_DEBUG_FUNCPTR (gst_file_src_get_size); gstbasesrc_class->create = GST_DEBUG_FUNCPTR (gst_file_src_create); gstbasesrc_class->query = GST_DEBUG_FUNCPTR (gst_file_src_query); if (sizeof (off_t) < 8) { GST_LOG ("No large file support, sizeof (off_t) = %" G_GSIZE_FORMAT "!", sizeof (off_t)); } } static void gst_file_src_init (GstFileSrc * src, GstFileSrcClass * g_class) { #ifdef HAVE_MMAP src->pagesize = getpagesize (); #endif src->filename = NULL; src->fd = 0; src->uri = NULL; src->touch = DEFAULT_TOUCH; src->mapbuf = NULL; src->mapsize = DEFAULT_MMAPSIZE; /* default is 4MB */ src->use_mmap = DEFAULT_USEMMAP; src->sequential = DEFAULT_SEQUENTIAL; src->is_regular = FALSE; } static void gst_file_src_finalize (GObject * object) { GstFileSrc *src; src = GST_FILE_SRC (object); g_free (src->filename); g_free (src->uri); G_OBJECT_CLASS (parent_class)->finalize (object); } static gboolean gst_file_src_set_location (GstFileSrc * src, const gchar * location) { GstState state; /* the element must be stopped in order to do this */ GST_OBJECT_LOCK (src); state = GST_STATE (src); if (state != GST_STATE_READY && state != GST_STATE_NULL) goto wrong_state; GST_OBJECT_UNLOCK (src); g_free (src->filename); g_free (src->uri); /* clear the filename if we get a NULL (is that possible?) */ if (location == NULL) { src->filename = NULL; src->uri = NULL; } else { /* we store the filename as received by the application. On Windoes this * should be UTF8 */ src->filename = g_strdup (location); src->uri = gst_uri_construct ("file", src->filename); } g_object_notify (G_OBJECT (src), "location"); gst_uri_handler_new_uri (GST_URI_HANDLER (src), src->uri); return TRUE; /* ERROR */ wrong_state: { GST_DEBUG_OBJECT (src, "setting location in wrong state"); GST_OBJECT_UNLOCK (src); return FALSE; } } static void gst_file_src_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstFileSrc *src; g_return_if_fail (GST_IS_FILE_SRC (object)); src = GST_FILE_SRC (object); switch (prop_id) { case ARG_LOCATION: gst_file_src_set_location (src, g_value_get_string (value)); break; case ARG_MMAPSIZE: if ((src->mapsize % src->pagesize) == 0) { src->mapsize = g_value_get_ulong (value); } else { GST_INFO_OBJECT (src, "invalid mapsize, must be a multiple of pagesize, which is %d", src->pagesize); } break; case ARG_TOUCH: src->touch = g_value_get_boolean (value); break; case ARG_SEQUENTIAL: src->sequential = g_value_get_boolean (value); break; case ARG_USEMMAP: src->use_mmap = g_value_get_boolean (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_file_src_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstFileSrc *src; g_return_if_fail (GST_IS_FILE_SRC (object)); src = GST_FILE_SRC (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_MMAPSIZE: g_value_set_ulong (value, src->mapsize); break; case ARG_TOUCH: g_value_set_boolean (value, src->touch); break; case ARG_SEQUENTIAL: g_value_set_boolean (value, src->sequential); break; case ARG_USEMMAP: g_value_set_boolean (value, src->use_mmap); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } /*** * mmap code below */ #ifdef HAVE_MMAP /* GstMmapBuffer */ typedef struct _GstMmapBuffer GstMmapBuffer; typedef struct _GstMmapBufferClass GstMmapBufferClass; #define GST_TYPE_MMAP_BUFFER (gst_mmap_buffer_get_type()) #define GST_IS_MMAP_BUFFER(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_MMAP_BUFFER)) #define GST_IS_MMAP_BUFFER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_MMAP_BUFFER)) #define GST_MMAP_BUFFER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_MMAP_BUFFER, GstMmapBufferClass)) #define GST_MMAP_BUFFER(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_MMAP_BUFFER, GstMmapBuffer)) #define GST_MMAP_BUFFER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_MMAP_BUFFER, GstMmapBufferClass)) struct _GstMmapBuffer { GstBuffer buffer; GstFileSrc *filesrc; }; struct _GstMmapBufferClass { GstBufferClass buffer_class; }; static void gst_mmap_buffer_init (GTypeInstance * instance, gpointer g_class); static void gst_mmap_buffer_class_init (gpointer g_class, gpointer class_data); static void gst_mmap_buffer_finalize (GstMmapBuffer * mmap_buffer); static GstBufferClass *mmap_buffer_parent_class = NULL; static GType gst_mmap_buffer_get_type (void) { static GType _gst_mmap_buffer_type; if (G_UNLIKELY (_gst_mmap_buffer_type == 0)) { static const GTypeInfo mmap_buffer_info = { sizeof (GstMmapBufferClass), NULL, NULL, gst_mmap_buffer_class_init, NULL, NULL, sizeof (GstMmapBuffer), 0, gst_mmap_buffer_init, NULL }; _gst_mmap_buffer_type = g_type_register_static (GST_TYPE_BUFFER, "GstMmapBuffer", &mmap_buffer_info, 0); } return _gst_mmap_buffer_type; } static void gst_mmap_buffer_class_init (gpointer g_class, gpointer class_data) { GstMiniObjectClass *mini_object_class = GST_MINI_OBJECT_CLASS (g_class); mmap_buffer_parent_class = g_type_class_peek_parent (g_class); mini_object_class->finalize = (GstMiniObjectFinalizeFunction) gst_mmap_buffer_finalize; } static void gst_mmap_buffer_init (GTypeInstance * instance, gpointer g_class) { GstBuffer *buf = (GstBuffer *) instance; GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_READONLY); /* before we re-enable this flag, we probably need to fix _copy() * _make_writable(), etc. in GstMiniObject/GstBuffer as well */ /* GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_ORIGINAL); */ } static void gst_mmap_buffer_finalize (GstMmapBuffer * mmap_buffer) { guint size; gpointer data; guint64 offset; GstFileSrc *src; GstBuffer *buffer = GST_BUFFER (mmap_buffer); /* get info */ size = GST_BUFFER_SIZE (buffer); offset = GST_BUFFER_OFFSET (buffer); data = GST_BUFFER_DATA (buffer); src = mmap_buffer->filesrc; GST_LOG ("freeing mmap()d buffer at %" G_GUINT64_FORMAT "+%u", offset, size); #ifdef MADV_DONTNEED /* madvise to tell the kernel what to do with it */ if (madvise (data, size, MADV_DONTNEED) < 0) { GST_WARNING_OBJECT (src, "warning: madvise failed: %s", g_strerror (errno)); } #endif /* now unmap the memory */ if (munmap (data, size) < 0) { GST_WARNING_OBJECT (src, "warning: munmap failed: %s", g_strerror (errno)); } /* cast to unsigned long, since there's no gportable way to print * guint64 as hex */ GST_LOG ("unmapped region %08lx+%08lx at %p", (gulong) offset, (gulong) size, data); GST_MINI_OBJECT_CLASS (mmap_buffer_parent_class)->finalize (GST_MINI_OBJECT (mmap_buffer)); } 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 */ 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_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; } static GstFlowReturn gst_file_src_create_mmap (GstFileSrc * src, guint64 offset, guint length, GstBuffer ** buffer) { GstBuffer *buf = NULL; gsize readsize, mapsize; off_t readend, mapstart, mapend; int i; /* calculate end pointers so we don't have to do so repeatedly later */ readsize = length; readend = offset + readsize; /* 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 */ 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 (offset >= 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 %" G_GUINT64_FORMAT "+%u lives in " "current mapbuf %u+%u, creating subbuffer of mapbuf", offset, (guint) readsize, (guint) mapstart, (guint) mapsize); buf = gst_buffer_create_sub (src->mapbuf, offset - mapstart, readsize); GST_BUFFER_OFFSET (buf) = offset; /* if the start actually is within the current mmap region, map an overlap buffer */ } else if (offset < mapend) { GST_LOG_OBJECT (src, "read buf %" G_GUINT64_FORMAT "+%u starts in " "mapbuf %u+%u but ends outside, creating new mmap", offset, (guint) readsize, (guint) mapstart, (guint) mapsize); buf = gst_file_src_map_small_region (src, offset, readsize); if (buf == NULL) goto could_not_mmap; } /* 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 %" G_GUINT64_FORMAT "+%d starts before " "mapbuf %d+%d, but overlaps it", (guint64) offset, (gint) readsize, (gint) mapstart, (gint) mapsize); buf = gst_file_src_map_small_region (src, offset, readsize); if (buf == NULL) goto could_not_mmap; } /* 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 %" G_GUINT64_FORMAT "+%d", offset, (int) readsize); /* if the read buffer crosses a mmap region boundary, create a one-off region */ if ((offset / src->mapsize) != (readend / src->mapsize)) { GST_LOG_OBJECT (src, "read buf %" G_GUINT64_FORMAT "+%d crosses a " "%d-byte boundary, creating a one-off", offset, (int) readsize, (int) src->mapsize); buf = gst_file_src_map_small_region (src, offset, readsize); if (buf == NULL) goto could_not_mmap; /* otherwise we will create a new mmap region and set it to the default */ } else { gsize mapsize; off_t nextmap = offset - (offset % src->mapsize); GST_LOG_OBJECT (src, "read buf %" G_GUINT64_FORMAT "+%d in new mapbuf " "at %" G_GUINT64_FORMAT "+%d, mapping and subbuffering", offset, (gint) readsize, (guint64) nextmap, (gint) 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 + offset > nextmap + mapsize) { GST_LOG_OBJECT (src, "readsize smaller then mapsize %08x %d", (guint) readsize, (gint) mapsize); mapsize <<= 1; } /* create a new one */ src->mapbuf = gst_file_src_map_region (src, nextmap, mapsize, FALSE); if (src->mapbuf == NULL) goto could_not_mmap; /* subbuffer it */ buf = gst_buffer_create_sub (src->mapbuf, offset - nextmap, readsize); GST_BUFFER_OFFSET (buf) = GST_BUFFER_OFFSET (src->mapbuf) + offset - 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; /* read first byte of each page */ for (i = 0; i < GST_BUFFER_SIZE (buf); i += src->pagesize) c = p[i]; } /* we're done, return the buffer */ *buffer = buf; return GST_FLOW_OK; /* ERROR */ could_not_mmap: { return GST_FLOW_ERROR; } } #endif /*** * read code below * that is to say, you shouldn't read the code below, but the code that reads * stuff is below. Well, you shouldn't not read the code below, feel free * to read it of course. It's just that "read code below" is a pretty crappy * documentation string because it sounds like we're expecting you to read * the code to understand what it does, which, while true, is really not * the sort of attitude we want to be advertising. No sir. * */ static GstFlowReturn gst_file_src_create_read (GstFileSrc * src, guint64 offset, guint length, GstBuffer ** buffer) { int ret; GstBuffer *buf; if (G_UNLIKELY (src->read_position != offset)) { off_t res; res = lseek (src->fd, offset, SEEK_SET); if (G_UNLIKELY (res < 0 || res != offset)) goto seek_failed; src->read_position = offset; } buf = gst_buffer_try_new_and_alloc (length); if (G_UNLIKELY (buf == NULL && length > 0)) { GST_ERROR_OBJECT (src, "Failed to allocate %u bytes", length); return GST_FLOW_ERROR; } GST_LOG_OBJECT (src, "Reading %d bytes", length); ret = read (src->fd, GST_BUFFER_DATA (buf), length); if (G_UNLIKELY (ret < 0)) goto could_not_read; /* seekable regular files should have given us what we expected */ if (G_UNLIKELY ((guint) ret < length && src->seekable)) goto unexpected_eos; /* other files should eos if they read 0 and more was requested */ if (G_UNLIKELY (ret == 0 && length > 0)) goto eos; length = ret; GST_BUFFER_SIZE (buf) = length; GST_BUFFER_OFFSET (buf) = offset; GST_BUFFER_OFFSET_END (buf) = offset + length; *buffer = buf; src->read_position += length; return GST_FLOW_OK; /* ERROR */ seek_failed: { GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL), GST_ERROR_SYSTEM); return GST_FLOW_ERROR; } could_not_read: { GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL), GST_ERROR_SYSTEM); gst_buffer_unref (buf); return GST_FLOW_ERROR; } unexpected_eos: { GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL), ("unexpected end of file.")); gst_buffer_unref (buf); return GST_FLOW_ERROR; } eos: { GST_DEBUG ("non-regular file hits EOS"); gst_buffer_unref (buf); return GST_FLOW_UNEXPECTED; } } static GstFlowReturn gst_file_src_create (GstBaseSrc * basesrc, guint64 offset, guint length, GstBuffer ** buffer) { GstFileSrc *src; GstFlowReturn ret; src = GST_FILE_SRC (basesrc); #ifdef HAVE_MMAP if (src->using_mmap) { ret = gst_file_src_create_mmap (src, offset, length, buffer); } else { ret = gst_file_src_create_read (src, offset, length, buffer); } #else ret = gst_file_src_create_read (src, offset, length, buffer); #endif return ret; } static gboolean gst_file_src_query (GstBaseSrc * basesrc, GstQuery * query) { gboolean ret = FALSE; GstFileSrc *src = GST_FILE_SRC (basesrc); switch (GST_QUERY_TYPE (query)) { case GST_QUERY_URI: gst_query_set_uri (query, src->uri); ret = TRUE; break; default: ret = FALSE; break; } if (!ret) ret = GST_BASE_SRC_CLASS (parent_class)->query (basesrc, query); return ret; } static gboolean gst_file_src_is_seekable (GstBaseSrc * basesrc) { GstFileSrc *src = GST_FILE_SRC (basesrc); return src->seekable; } static gboolean gst_file_src_get_size (GstBaseSrc * basesrc, guint64 * size) { struct stat stat_results; GstFileSrc *src; src = GST_FILE_SRC (basesrc); if (!src->seekable) { /* If it isn't seekable, we won't know the length (but fstat will still * succeed, and wrongly say our length is zero. */ return FALSE; } if (fstat (src->fd, &stat_results) < 0) goto could_not_stat; *size = stat_results.st_size; return TRUE; /* ERROR */ could_not_stat: { return FALSE; } } /* open the file and mmap it, necessary to go to READY state */ static gboolean gst_file_src_start (GstBaseSrc * basesrc) { GstFileSrc *src = GST_FILE_SRC (basesrc); struct stat stat_results; if (src->filename == NULL || src->filename[0] == '\0') goto no_filename; GST_INFO_OBJECT (src, "opening file %s", src->filename); /* open the file */ src->fd = gst_open (src->filename, O_RDONLY | O_BINARY, 0); if (src->fd < 0) goto open_failed; /* check if it is a regular file, otherwise bail out */ if (fstat (src->fd, &stat_results) < 0) goto no_stat; if (S_ISDIR (stat_results.st_mode)) goto was_directory; if (S_ISSOCK (stat_results.st_mode)) goto was_socket; src->using_mmap = FALSE; src->read_position = 0; /* record if it's a regular (hence seekable and lengthable) file */ if (S_ISREG (stat_results.st_mode)) src->is_regular = TRUE; #ifdef HAVE_MMAP if (src->use_mmap) { /* FIXME: maybe we should only try to mmap if it's a regular file */ /* allocate the first mmap'd region if it's a regular file ? */ src->mapbuf = gst_file_src_map_region (src, 0, src->mapsize, TRUE); if (src->mapbuf != NULL) { GST_DEBUG_OBJECT (src, "using mmap for file"); src->using_mmap = TRUE; src->seekable = TRUE; } } if (src->mapbuf == NULL) #endif { /* If not in mmap mode, we need to check if the underlying file is * seekable. */ off_t res = lseek (src->fd, 0, SEEK_END); if (res < 0) { GST_LOG_OBJECT (src, "disabling seeking, not in mmap mode and lseek " "failed: %s", g_strerror (errno)); src->seekable = FALSE; } else { src->seekable = TRUE; } lseek (src->fd, 0, SEEK_SET); } /* We can only really do seeking on regular files - for other file types, we * don't know their length, so seeking isn't useful/meaningful */ src->seekable = src->seekable && src->is_regular; return TRUE; /* ERROR */ no_filename: { GST_ELEMENT_ERROR (src, RESOURCE, NOT_FOUND, (_("No file name specified for reading.")), (NULL)); return FALSE; } open_failed: { switch (errno) { case ENOENT: GST_ELEMENT_ERROR (src, RESOURCE, NOT_FOUND, (NULL), ("No such file \"%s\"", src->filename)); break; default: GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ, (_("Could not open file \"%s\" for reading."), src->filename), GST_ERROR_SYSTEM); break; } return FALSE; } no_stat: { GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ, (_("Could not get info on \"%s\"."), src->filename), (NULL)); close (src->fd); return FALSE; } was_directory: { GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ, (_("\"%s\" is a directory."), src->filename), (NULL)); close (src->fd); return FALSE; } was_socket: { GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ, (_("File \"%s\" is a socket."), src->filename), (NULL)); close (src->fd); return FALSE; } } /* unmap and close the file */ static gboolean gst_file_src_stop (GstBaseSrc * basesrc) { GstFileSrc *src = GST_FILE_SRC (basesrc); /* close the file */ close (src->fd); /* zero out a lot of our state */ src->fd = 0; src->is_regular = FALSE; if (src->mapbuf) { gst_buffer_unref (src->mapbuf); src->mapbuf = NULL; } return TRUE; } /*** GSTURIHANDLER INTERFACE *************************************************/ static GstURIType gst_file_src_uri_get_type (void) { return GST_URI_SRC; } static gchar ** gst_file_src_uri_get_protocols (void) { static gchar *protocols[] = { "file", NULL }; return protocols; } static const gchar * gst_file_src_uri_get_uri (GstURIHandler * handler) { GstFileSrc *src = GST_FILE_SRC (handler); return src->uri; } static gboolean gst_file_src_uri_set_uri (GstURIHandler * handler, const gchar * uri) { gchar *location, *hostname = NULL; gboolean ret = FALSE; GstFileSrc *src = GST_FILE_SRC (handler); if (strcmp (uri, "file://") == 0) { /* Special case for "file://" as this is used by some applications * to test with gst_element_make_from_uri if there's an element * that supports the URI protocol. */ gst_file_src_set_location (src, NULL); return TRUE; } location = g_filename_from_uri (uri, &hostname, NULL); if (!location) { GST_WARNING_OBJECT (src, "Invalid URI '%s' for filesrc", uri); goto beach; } if ((hostname) && (strcmp (hostname, "localhost"))) { /* Only 'localhost' is permitted */ GST_WARNING_OBJECT (src, "Invalid hostname '%s' for filesrc", hostname); goto beach; } #ifdef G_OS_WIN32 /* Unfortunately, g_filename_from_uri() doesn't handle some UNC paths * correctly on windows, it leaves them with an extra backslash * at the start if they're of the mozilla-style file://///host/path/file * form. Correct this. */ if (location[0] == '\\' && location[1] == '\\' && location[2] == '\\') g_memmove (location, location + 1, strlen (location + 1) + 1); #endif ret = gst_file_src_set_location (src, location); beach: if (location) g_free (location); if (hostname) g_free (hostname); return ret; } static void gst_file_src_uri_handler_init (gpointer g_iface, gpointer iface_data) { GstURIHandlerInterface *iface = (GstURIHandlerInterface *) g_iface; iface->get_type = gst_file_src_uri_get_type; iface->get_protocols = gst_file_src_uri_get_protocols; iface->get_uri = gst_file_src_uri_get_uri; iface->set_uri = gst_file_src_uri_set_uri; }