mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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1191 lines
34 KiB
C
1191 lines
34 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000,2005 Wim Taymans <wim@fluendo.com>
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*
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* gstfilesrc.c:
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:element-filesrc
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* @see_also: #GstFileSrc
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*
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* Read data from a file in the local file system.
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*
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* <refsect2>
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* <title>Example launch line</title>
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* |[
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* gst-launch filesrc location=song.ogg ! decodebin2 ! autoaudiosink
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* ]| Play a song.ogg from local dir.
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* </refsect2>
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <gst/gst.h>
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#include "gstfilesrc.h"
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#include <stdio.h>
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#include <sys/types.h>
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#ifdef G_OS_WIN32
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#include <io.h> /* lseek, open, close, read */
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/* On win32, stat* default to 32 bit; we need the 64-bit
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* variants, so explicitly define it that way. */
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#define stat __stat64
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#define fstat _fstat64
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#undef lseek
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#define lseek _lseeki64
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#undef off_t
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#define off_t guint64
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/* Prevent stat.h from defining the stat* functions as
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* _stat*, since we're explicitly overriding that */
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#undef _INC_STAT_INL
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#endif
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#include <sys/stat.h>
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#include <fcntl.h>
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#ifdef HAVE_MMAP
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# include <sys/mman.h>
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#endif
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#include <errno.h>
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#include <string.h>
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#include "../../gst/gst-i18n-lib.h"
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static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS_ANY);
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/* FIXME we should be using glib for this */
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#ifndef S_ISREG
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#define S_ISREG(mode) ((mode)&_S_IFREG)
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#endif
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#ifndef S_ISDIR
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#define S_ISDIR(mode) ((mode)&_S_IFDIR)
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#endif
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#ifndef S_ISSOCK
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#define S_ISSOCK(x) (0)
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#endif
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#ifndef O_BINARY
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#define O_BINARY (0)
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#endif
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/* Copy of glib's g_open due to win32 libc/cross-DLL brokenness: we can't
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* use the 'file descriptor' opened in glib (and returned from this function)
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* in this library, as they may have unrelated C runtimes. */
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static int
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gst_open (const gchar * filename, int flags, int mode)
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{
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#ifdef G_OS_WIN32
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wchar_t *wfilename = g_utf8_to_utf16 (filename, -1, NULL, NULL, NULL);
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int retval;
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int save_errno;
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if (wfilename == NULL) {
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errno = EINVAL;
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return -1;
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}
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retval = _wopen (wfilename, flags, mode);
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save_errno = errno;
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g_free (wfilename);
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errno = save_errno;
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return retval;
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#else
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return open (filename, flags, mode);
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#endif
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}
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/**********************************************************************
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* GStreamer Default File Source
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* Theory of Operation
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*
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* Update: see GstFileSrc:use-mmap property documentation below
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* for why use of mmap() is disabled by default.
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*
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* This source uses mmap(2) to efficiently load data from a file.
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* To do this without seriously polluting the applications' memory
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* space, it must do so in smaller chunks, say 1-4MB at a time.
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* Buffers are then subdivided from these mmap'd chunks, to directly
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* make use of the mmap.
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*
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* To handle refcounting so that the mmap can be freed at the appropriate
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* time, a buffer will be created for each mmap'd region, and all new
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* buffers will be sub-buffers of this top-level buffer. As they are
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* freed, the refcount goes down on the mmap'd buffer and its free()
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* function is called, which will call munmap(2) on itself.
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*
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* If a buffer happens to cross the boundaries of an mmap'd region, we
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* have to decide whether it's more efficient to copy the data into a
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* new buffer, or mmap() just that buffer. There will have to be a
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* breakpoint size to determine which will be done. The mmap() size
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* has a lot to do with this as well, because you end up in double-
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* jeopardy: the larger the outgoing buffer, the more data to copy when
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* it overlaps, *and* the more frequently you'll have buffers that *do*
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* overlap.
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*
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* Seeking is another tricky aspect to do efficiently. The initial
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* implementation of this source won't make use of these features, however.
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* The issue is that if an application seeks backwards in a file, *and*
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* that region of the file is covered by an mmap that hasn't been fully
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* deallocated, we really should re-use it. But keeping track of these
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* regions is tricky because we have to lock the structure that holds
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* them. We need to settle on a locking primitive (GMutex seems to be
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* a really good option...), then we can do that.
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*/
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GST_DEBUG_CATEGORY_STATIC (gst_file_src_debug);
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#define GST_CAT_DEFAULT gst_file_src_debug
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/* FileSrc signals and args */
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enum
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{
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/* FILL ME */
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LAST_SIGNAL
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};
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#define DEFAULT_BLOCKSIZE 4*1024
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#define DEFAULT_MMAPSIZE 4*1024*1024
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#define DEFAULT_TOUCH TRUE
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#define DEFAULT_USEMMAP FALSE
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#define DEFAULT_SEQUENTIAL FALSE
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enum
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{
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ARG_0,
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ARG_LOCATION,
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ARG_FD,
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ARG_MMAPSIZE,
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ARG_SEQUENTIAL,
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ARG_TOUCH,
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ARG_USEMMAP
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};
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static void gst_file_src_finalize (GObject * object);
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static void gst_file_src_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_file_src_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static gboolean gst_file_src_start (GstBaseSrc * basesrc);
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static gboolean gst_file_src_stop (GstBaseSrc * basesrc);
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static gboolean gst_file_src_is_seekable (GstBaseSrc * src);
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static gboolean gst_file_src_get_size (GstBaseSrc * src, guint64 * size);
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static GstFlowReturn gst_file_src_create (GstBaseSrc * src, guint64 offset,
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guint length, GstBuffer ** buffer);
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static gboolean gst_file_src_query (GstBaseSrc * src, GstQuery * query);
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static void gst_file_src_uri_handler_init (gpointer g_iface,
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gpointer iface_data);
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static void
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_do_init (GType filesrc_type)
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{
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static const GInterfaceInfo urihandler_info = {
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gst_file_src_uri_handler_init,
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NULL,
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NULL
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};
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g_type_add_interface_static (filesrc_type, GST_TYPE_URI_HANDLER,
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&urihandler_info);
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GST_DEBUG_CATEGORY_INIT (gst_file_src_debug, "filesrc", 0, "filesrc element");
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}
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GST_BOILERPLATE_FULL (GstFileSrc, gst_file_src, GstBaseSrc, GST_TYPE_BASE_SRC,
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_do_init);
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static void
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gst_file_src_base_init (gpointer g_class)
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{
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GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
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gst_element_class_set_details_simple (gstelement_class,
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"File Source",
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"Source/File",
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"Read from arbitrary point in a file",
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"Erik Walthinsen <omega@cse.ogi.edu>");
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&srctemplate));
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}
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static void
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gst_file_src_class_init (GstFileSrcClass * klass)
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{
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GObjectClass *gobject_class;
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GstBaseSrcClass *gstbasesrc_class;
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gobject_class = G_OBJECT_CLASS (klass);
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gstbasesrc_class = GST_BASE_SRC_CLASS (klass);
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gobject_class->set_property = gst_file_src_set_property;
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gobject_class->get_property = gst_file_src_get_property;
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g_object_class_install_property (gobject_class, ARG_FD,
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g_param_spec_int ("fd", "File-descriptor",
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"File-descriptor for the file being mmap()d", 0, G_MAXINT, 0,
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G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, ARG_LOCATION,
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g_param_spec_string ("location", "File Location",
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"Location of the file to read", NULL,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
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GST_PARAM_MUTABLE_READY));
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g_object_class_install_property (gobject_class, ARG_MMAPSIZE,
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g_param_spec_ulong ("mmapsize", "mmap() Block Size",
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"Size in bytes of mmap()d regions", 0, G_MAXULONG, DEFAULT_MMAPSIZE,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
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GST_PARAM_MUTABLE_PLAYING));
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g_object_class_install_property (gobject_class, ARG_TOUCH,
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g_param_spec_boolean ("touch", "Touch mapped region read data",
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"Touch mmapped data regions to force them to be read from disk",
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DEFAULT_TOUCH,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
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GST_PARAM_MUTABLE_PLAYING));
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/**
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* GstFileSrc:use-mmap
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*
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* Whether to use mmap(). Set to TRUE to force use of mmap() instead of
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* read() for reading data.
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*
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* Use of mmap() is disabled by default since with mmap() there are a
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* number of occasions where the process/application will be notified of
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* read errors via a SIGBUS signal from the kernel, which will lead to
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* the application being killed if not handled by the application. This
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* is something that is difficult to work around for a library like
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* GStreamer, hence use of mmap() is disabled by default. Said errors
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* can occur for example when an external device (e.g. an external hard
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* drive or a portable music player) are unplugged while in use, or when
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* a CD/DVD medium cannot be be read because the medium is scratched or
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* otherwise damaged.
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*
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**/
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g_object_class_install_property (gobject_class, ARG_USEMMAP,
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g_param_spec_boolean ("use-mmap", "Use mmap to read data",
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"Whether to use mmap() instead of read()",
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DEFAULT_USEMMAP, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
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GST_PARAM_MUTABLE_READY));
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g_object_class_install_property (gobject_class, ARG_SEQUENTIAL,
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g_param_spec_boolean ("sequential", "Optimise for sequential mmap access",
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"Whether to use madvise to hint to the kernel that access to "
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"mmap pages will be sequential",
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DEFAULT_SEQUENTIAL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
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GST_PARAM_MUTABLE_PLAYING));
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gobject_class->finalize = gst_file_src_finalize;
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gstbasesrc_class->start = GST_DEBUG_FUNCPTR (gst_file_src_start);
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gstbasesrc_class->stop = GST_DEBUG_FUNCPTR (gst_file_src_stop);
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gstbasesrc_class->is_seekable = GST_DEBUG_FUNCPTR (gst_file_src_is_seekable);
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gstbasesrc_class->get_size = GST_DEBUG_FUNCPTR (gst_file_src_get_size);
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gstbasesrc_class->create = GST_DEBUG_FUNCPTR (gst_file_src_create);
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gstbasesrc_class->query = GST_DEBUG_FUNCPTR (gst_file_src_query);
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if (sizeof (off_t) < 8) {
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GST_LOG ("No large file support, sizeof (off_t) = %" G_GSIZE_FORMAT "!",
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sizeof (off_t));
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}
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}
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static void
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gst_file_src_init (GstFileSrc * src, GstFileSrcClass * g_class)
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{
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#ifdef HAVE_MMAP
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src->pagesize = getpagesize ();
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#endif
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src->filename = NULL;
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src->fd = 0;
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src->uri = NULL;
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src->touch = DEFAULT_TOUCH;
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src->mapbuf = NULL;
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src->mapsize = DEFAULT_MMAPSIZE; /* default is 4MB */
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src->use_mmap = DEFAULT_USEMMAP;
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src->sequential = DEFAULT_SEQUENTIAL;
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src->is_regular = FALSE;
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}
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static void
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gst_file_src_finalize (GObject * object)
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{
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GstFileSrc *src;
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src = GST_FILE_SRC (object);
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g_free (src->filename);
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g_free (src->uri);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static gboolean
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gst_file_src_set_location (GstFileSrc * src, const gchar * location)
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{
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GstState state;
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/* the element must be stopped in order to do this */
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GST_OBJECT_LOCK (src);
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state = GST_STATE (src);
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if (state != GST_STATE_READY && state != GST_STATE_NULL)
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goto wrong_state;
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GST_OBJECT_UNLOCK (src);
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g_free (src->filename);
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g_free (src->uri);
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/* clear the filename if we get a NULL (is that possible?) */
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if (location == NULL) {
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src->filename = NULL;
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src->uri = NULL;
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} else {
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/* we store the filename as received by the application. On Windows this
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* should be UTF8 */
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src->filename = g_strdup (location);
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src->uri = gst_filename_to_uri (location, NULL);
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GST_INFO ("filename : %s", src->filename);
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GST_INFO ("uri : %s", src->uri);
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}
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g_object_notify (G_OBJECT (src), "location");
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gst_uri_handler_new_uri (GST_URI_HANDLER (src), src->uri);
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return TRUE;
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/* ERROR */
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wrong_state:
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{
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g_warning ("Changing the `location' property on filesrc when a file is "
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"open is not supported.");
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GST_OBJECT_UNLOCK (src);
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return FALSE;
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}
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}
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static void
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gst_file_src_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstFileSrc *src;
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g_return_if_fail (GST_IS_FILE_SRC (object));
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src = GST_FILE_SRC (object);
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switch (prop_id) {
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case ARG_LOCATION:
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gst_file_src_set_location (src, g_value_get_string (value));
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break;
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case ARG_MMAPSIZE:
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if ((src->mapsize % src->pagesize) == 0) {
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src->mapsize = g_value_get_ulong (value);
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} else {
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GST_INFO_OBJECT (src,
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"invalid mapsize, must be a multiple of pagesize, which is %d",
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src->pagesize);
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}
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break;
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case ARG_TOUCH:
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src->touch = g_value_get_boolean (value);
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break;
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case ARG_SEQUENTIAL:
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src->sequential = g_value_get_boolean (value);
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break;
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case ARG_USEMMAP:
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src->use_mmap = g_value_get_boolean (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_file_src_get_property (GObject * object, guint prop_id, GValue * value,
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GParamSpec * pspec)
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{
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GstFileSrc *src;
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g_return_if_fail (GST_IS_FILE_SRC (object));
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src = GST_FILE_SRC (object);
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switch (prop_id) {
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case ARG_LOCATION:
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g_value_set_string (value, src->filename);
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break;
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case ARG_FD:
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g_value_set_int (value, src->fd);
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break;
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case ARG_MMAPSIZE:
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g_value_set_ulong (value, src->mapsize);
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break;
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case ARG_TOUCH:
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g_value_set_boolean (value, src->touch);
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break;
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case ARG_SEQUENTIAL:
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g_value_set_boolean (value, src->sequential);
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break;
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case ARG_USEMMAP:
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g_value_set_boolean (value, src->use_mmap);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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|
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#undef HAVE_MMAP
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/***
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* mmap code below
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*/
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|
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#ifdef HAVE_MMAP
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|
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/* GstMmapBuffer */
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|
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typedef struct _GstMmapBuffer GstMmapBuffer;
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typedef struct _GstMmapBufferClass GstMmapBufferClass;
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|
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#define GST_TYPE_MMAP_BUFFER (gst_mmap_buffer_get_type())
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|
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#define GST_IS_MMAP_BUFFER(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_MMAP_BUFFER))
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#define GST_IS_MMAP_BUFFER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_MMAP_BUFFER))
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#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_finalize (GstMmapBuffer * mmap_buffer);
|
|
|
|
GType gst_mmap_buffer_get_type (void);
|
|
|
|
G_DEFINE_TYPE (GstMmapBuffer, gst_mmap_buffer, GST_TYPE_BUFFER);
|
|
|
|
static void
|
|
gst_mmap_buffer_class_init (GstMmapBufferClass * g_class)
|
|
{
|
|
GstMiniObjectClass *mini_object_class = GST_MINI_OBJECT_CLASS (g_class);
|
|
|
|
mini_object_class->finalize =
|
|
(GstMiniObjectFinalizeFunction) gst_mmap_buffer_finalize;
|
|
}
|
|
|
|
static void
|
|
gst_mmap_buffer_init (GstMmapBuffer * buf)
|
|
{
|
|
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 (gst_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);
|
|
|
|
/* 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_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);
|
|
|
|
/* read first byte of each page */
|
|
for (i = 0; i < GST_BUFFER_SIZE (buf); i += src->pagesize)
|
|
(void) 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;
|
|
guint8 *data;
|
|
gsize size;
|
|
|
|
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_new_and_alloc (length);
|
|
if (G_UNLIKELY (buf == NULL && length > 0))
|
|
goto alloc_failed;
|
|
|
|
/* No need to read anything if length is 0 */
|
|
if (length > 0) {
|
|
data = gst_buffer_map (buf, &size, NULL, GST_MAP_WRITE);
|
|
|
|
GST_LOG_OBJECT (src, "Reading %d bytes at offset 0x%" G_GINT64_MODIFIER "x",
|
|
length, offset);
|
|
ret = read (src->fd, data, 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_unmap (buf, data, length);
|
|
|
|
GST_BUFFER_OFFSET (buf) = offset;
|
|
GST_BUFFER_OFFSET_END (buf) = offset + length;
|
|
|
|
src->read_position += length;
|
|
}
|
|
|
|
*buffer = buf;
|
|
|
|
return GST_FLOW_OK;
|
|
|
|
/* ERROR */
|
|
seek_failed:
|
|
{
|
|
GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL), GST_ERROR_SYSTEM);
|
|
return GST_FLOW_ERROR;
|
|
}
|
|
alloc_failed:
|
|
{
|
|
GST_ERROR_OBJECT (src, "Failed to allocate %u bytes", length);
|
|
return GST_FLOW_ERROR;
|
|
}
|
|
could_not_read:
|
|
{
|
|
GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL), GST_ERROR_SYSTEM);
|
|
gst_buffer_unmap (buf, data, 0);
|
|
gst_buffer_unref (buf);
|
|
return GST_FLOW_ERROR;
|
|
}
|
|
unexpected_eos:
|
|
{
|
|
GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),
|
|
("unexpected end of file."));
|
|
gst_buffer_unmap (buf, data, 0);
|
|
gst_buffer_unref (buf);
|
|
return GST_FLOW_ERROR;
|
|
}
|
|
eos:
|
|
{
|
|
GST_DEBUG ("non-regular file hits EOS");
|
|
gst_buffer_unmap (buf, data, 0);
|
|
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_CAST (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[] = { (char *) "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);
|
|
GError *error = NULL;
|
|
|
|
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, &error);
|
|
|
|
if (!location || error) {
|
|
if (error) {
|
|
GST_WARNING_OBJECT (src, "Invalid URI '%s' for filesrc: %s", uri,
|
|
error->message);
|
|
g_error_free (error);
|
|
} else {
|
|
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;
|
|
}
|