gstreamer/gst/gio/gstgiosrc.c
2012-04-10 00:45:16 +01:00

349 lines
11 KiB
C

/* GStreamer
*
* Copyright (C) 2007 Rene Stadler <mail@renestadler.de>
* Copyright (C) 2007-2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>
*
* 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-giosrc
* @see_also: #GstFileSrc, #GstGnomeVFSSrc, #GstGioSink
*
* This plugin reads data from a local or remote location specified
* by an URI. This location can be specified using any protocol supported by
* the GIO library or it's VFS backends. Common protocols are 'file', 'http',
* 'ftp', or 'smb'.
*
* If an URI or #GFile is not mounted giosrc will post a message of type
* %GST_MESSAGE_ELEMENT with name "not-mounted" on the bus. The message
* also contains the #GFile and the corresponding URI.
* Applications can use the "not-mounted" message to mount the #GFile
* by calling g_file_mount_enclosing_volume() and then restart the
* pipeline after the mounting has succeeded. Note that right after the
* "not-mounted" message a normal error message is posted on the bus which
* should be ignored if "not-mounted" is handled by the application, for
* example by calling gst_bus_set_flushing(bus, TRUE) after the "not-mounted"
* message was received and gst_bus_set_flushing(bus, FALSE) after the
* mounting was successful.
*
* <refsect2>
* <title>Example launch lines</title>
* |[
* gst-launch -v giosrc location=file:///home/joe/foo.xyz ! fakesink
* ]| The above pipeline will simply read a local file and do nothing with the
* data read. Instead of giosrc, we could just as well have used the
* filesrc element here.
* |[
* gst-launch -v giosrc location=smb://othercomputer/foo.xyz ! filesink location=/home/joe/foo.xyz
* ]| The above pipeline will copy a file from a remote host to the local file
* system using the Samba protocol.
* |[
* gst-launch -v giosrc location=http://music.foobar.com/demo.mp3 ! mad ! audioconvert ! audioresample ! alsasink
* ]| The above pipeline will read and decode and play an mp3 file from a
* web server using the http protocol.
* </refsect2>
*/
/* FIXME: We would like to mount the enclosing volume of an URL
* if it isn't mounted yet but this is possible async-only.
* Unfortunately this requires a running main loop from the
* default context and we can't guarantuee this!
*
* We would also like to do authentication while mounting.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "gstgiosrc.h"
#include <string.h>
GST_DEBUG_CATEGORY_STATIC (gst_gio_src_debug);
#define GST_CAT_DEFAULT gst_gio_src_debug
enum
{
PROP_0,
PROP_LOCATION,
PROP_FILE
};
#define gst_gio_src_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstGioSrc, gst_gio_src,
GST_TYPE_GIO_BASE_SRC, gst_gio_uri_handler_do_init (g_define_type_id));
static void gst_gio_src_finalize (GObject * object);
static void gst_gio_src_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_gio_src_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GInputStream *gst_gio_src_get_stream (GstGioBaseSrc * bsrc);
static gboolean gst_gio_src_query (GstBaseSrc * base_src, GstQuery * query);
static void
gst_gio_src_class_init (GstGioSrcClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstElementClass *gstelement_class = (GstElementClass *) klass;
GstBaseSrcClass *gstbasesrc_class = (GstBaseSrcClass *) klass;
GstGioBaseSrcClass *gstgiobasesrc_class = (GstGioBaseSrcClass *) klass;
GST_DEBUG_CATEGORY_INIT (gst_gio_src_debug, "gio_src", 0, "GIO source");
gobject_class->finalize = gst_gio_src_finalize;
gobject_class->set_property = gst_gio_src_set_property;
gobject_class->get_property = gst_gio_src_get_property;
g_object_class_install_property (gobject_class, PROP_LOCATION,
g_param_spec_string ("location", "Location", "URI location to read from",
NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstGioSrc:file
*
* %GFile to read from.
*
* Since: 0.10.20
**/
g_object_class_install_property (gobject_class, PROP_FILE,
g_param_spec_object ("file", "File", "GFile to read from",
G_TYPE_FILE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_set_static_metadata (gstelement_class, "GIO source",
"Source/File",
"Read from any GIO-supported location",
"Ren\xc3\xa9 Stadler <mail@renestadler.de>, "
"Sebastian Dröge <sebastian.droege@collabora.co.uk>");
gstbasesrc_class->query = GST_DEBUG_FUNCPTR (gst_gio_src_query);
gstgiobasesrc_class->get_stream = GST_DEBUG_FUNCPTR (gst_gio_src_get_stream);
gstgiobasesrc_class->close_on_stop = TRUE;
}
static void
gst_gio_src_init (GstGioSrc * src)
{
}
static void
gst_gio_src_finalize (GObject * object)
{
GstGioSrc *src = GST_GIO_SRC (object);
if (src->file) {
g_object_unref (src->file);
src->file = NULL;
}
GST_CALL_PARENT (G_OBJECT_CLASS, finalize, (object));
}
static void
gst_gio_src_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstGioSrc *src = GST_GIO_SRC (object);
switch (prop_id) {
case PROP_LOCATION:{
const gchar *uri = NULL;
if (GST_STATE (src) == GST_STATE_PLAYING ||
GST_STATE (src) == GST_STATE_PAUSED) {
GST_WARNING
("Setting a new location or GFile not supported in PLAYING or PAUSED state");
break;
}
GST_OBJECT_LOCK (GST_OBJECT (src));
if (src->file)
g_object_unref (src->file);
uri = g_value_get_string (value);
if (uri) {
src->file = g_file_new_for_uri (uri);
if (!src->file) {
GST_ERROR ("Could not create GFile for URI '%s'", uri);
}
} else {
src->file = NULL;
}
GST_OBJECT_UNLOCK (GST_OBJECT (src));
break;
}
case PROP_FILE:
if (GST_STATE (src) == GST_STATE_PLAYING ||
GST_STATE (src) == GST_STATE_PAUSED) {
GST_WARNING
("Setting a new location or GFile not supported in PLAYING or PAUSED state");
break;
}
GST_OBJECT_LOCK (GST_OBJECT (src));
if (src->file)
g_object_unref (src->file);
src->file = g_value_dup_object (value);
GST_OBJECT_UNLOCK (GST_OBJECT (src));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_gio_src_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstGioSrc *src = GST_GIO_SRC (object);
switch (prop_id) {
case PROP_LOCATION:{
gchar *uri;
GST_OBJECT_LOCK (GST_OBJECT (src));
if (src->file) {
uri = g_file_get_uri (src->file);
g_value_set_string (value, uri);
g_free (uri);
} else {
g_value_set_string (value, NULL);
}
GST_OBJECT_UNLOCK (GST_OBJECT (src));
break;
}
case PROP_FILE:
GST_OBJECT_LOCK (GST_OBJECT (src));
g_value_set_object (value, src->file);
GST_OBJECT_UNLOCK (GST_OBJECT (src));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_gio_src_query (GstBaseSrc * base_src, GstQuery * query)
{
gboolean res;
GstGioSrc *src = GST_GIO_SRC (base_src);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_SCHEDULING:
{
gchar *scheme;
GstSchedulingFlags flags;
flags = 0;
if (src->file == NULL)
goto forward_parent;
scheme = g_file_get_uri_scheme (src->file);
if (scheme == NULL)
goto forward_parent;
if (strcmp (scheme, "file") == 0) {
GST_LOG_OBJECT (src, "local URI, assuming random access is possible");
flags |= GST_SCHEDULING_FLAG_SEEKABLE;
} else if (strcmp (scheme, "http") == 0 || strcmp (scheme, "https") == 0) {
GST_LOG_OBJECT (src, "blacklisted protocol '%s', "
"no random access possible", scheme);
} else {
GST_LOG_OBJECT (src, "unhandled protocol '%s', asking parent", scheme);
goto forward_parent;
}
g_free (scheme);
gst_query_set_scheduling (query, flags, 1, -1, 0);
gst_query_add_scheduling_mode (query, GST_PAD_MODE_PUSH);
if (flags & GST_SCHEDULING_FLAG_SEEKABLE)
gst_query_add_scheduling_mode (query, GST_PAD_MODE_PULL);
res = TRUE;
break;
}
default:
forward_parent:
res = GST_CALL_PARENT_WITH_DEFAULT (GST_BASE_SRC_CLASS,
query, (base_src, query), FALSE);
break;
}
return res;
}
static GInputStream *
gst_gio_src_get_stream (GstGioBaseSrc * bsrc)
{
GstGioSrc *src = GST_GIO_SRC (bsrc);
GError *err = NULL;
GInputStream *stream;
GCancellable *cancel = bsrc->cancel;
gchar *uri = NULL;
if (src->file == NULL) {
GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ, (NULL),
("No location or GFile given"));
return NULL;
}
uri = g_file_get_uri (src->file);
if (!uri)
uri = g_strdup ("(null)");
stream = G_INPUT_STREAM (g_file_read (src->file, cancel, &err));
if (stream == NULL && !gst_gio_error (src, "g_file_read", &err, NULL)) {
if (GST_GIO_ERROR_MATCHES (err, NOT_FOUND)) {
GST_ELEMENT_ERROR (src, RESOURCE, NOT_FOUND, (NULL),
("Could not open location %s for reading: %s", uri, err->message));
} else if (GST_GIO_ERROR_MATCHES (err, NOT_MOUNTED)) {
gst_element_post_message (GST_ELEMENT_CAST (src),
gst_message_new_element (GST_OBJECT_CAST (src),
gst_structure_new ("not-mounted", "file", G_TYPE_FILE, src->file,
"uri", G_TYPE_STRING, uri, NULL)));
GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ, (NULL),
("Location %s not mounted: %s", uri, err->message));
} else {
GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ, (NULL),
("Could not open location %s for reading: %s", uri, err->message));
}
g_free (uri);
g_clear_error (&err);
return NULL;
} else if (stream == NULL) {
g_free (uri);
return NULL;
}
GST_DEBUG_OBJECT (src, "opened location %s", uri);
g_free (uri);
return stream;
}