gstreamer/ext/metadata/gstmetadatademux.c
Edgard Lima 90f78abd15 Add some documentation.
Original commit message from CVS:
Add some documentation.
2008-01-23 16:35:34 +00:00

581 lines
16 KiB
C

/*
* GStreamer
* Copyright 2007 Edgard Lima <edgard.lima@indt.org.br>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Alternatively, the contents of this file may be used under the
* GNU Lesser General Public License Version 2.1 (the "LGPL"), in
* which case the following provisions apply instead of the ones
* mentioned above:
*
* 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-metadatademux
* @short_description: element that parse or demux metadata from image files
* @see_also: #metadatamux
*
* <refsect2>
* <para>
* This element parses image files JPEG and PNG, to find metadata chunks (EXIF,
* IPTC, XMP) in it, and then send individual tags as a 'tag message' do the
* application and as 'tag event' to the next element in pipeline. It also
* strips out the metadata chunks from original stream (unless the 'parse-only'
* property is set to 'true'). In addition the whole metadata chunk (striped
* or not) it also sent as a message to the application bus, so the application
* can have more controls about the metadata.
* </para>
* <title>Example launch line</title>
* <para>
* <programlisting>
* gst-launch -v -m filesrc location=./test.jpeg ! metadatademux ! fakesink
* silent=TRUE
* </programlisting>
* <programlisting>
* GST_DEBUG:*metadata:5 gst-launch filesrc location=./test.jpeg !
* metadatademux ! fakesink
* </programlisting>
* </para>
* <title>Application sample code using 'libexif' to have more control</title>
* <para>
* <programlisting>
* val = gst_tag_list_get_value_index (taglist, GST_TAG_EXIF, 0);
* if (val) {
* exif_chunk = gst_value_get_buffer (val);
* if (exif_chunk) {
* ed = exif_data_new_from_data (GST_BUFFER_DATA (exif_chunk),
* GST_BUFFER_SIZE (exif_chunk));
* }
* }
* </programlisting>
* This same idea can be used to handle IPTC and XMP directly by using
* libdata and exempi (or any other libraries). Notice: the whole metadata
* chunk sent as a message to the application contains only metadata data, i.e.
* the wrapper specific to the file format (JPEG, PNG, ...) is already
* striped out.
* </para>
* </refsect2>
*/
/*
* includes
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <gst/gst.h>
#include "gstmetadatademux.h"
#include "metadataexif.h"
#include "metadataiptc.h"
#include "metadataxmp.h"
#include <string.h>
/*
* enum and types
*/
enum
{
LAST_SIGNAL
};
enum
{
ARG_0,
ARG_PARSE_ONLY
};
/*
* defines and static global vars
*/
GST_DEBUG_CATEGORY_STATIC (gst_metadata_demux_debug);
#define GST_CAT_DEFAULT gst_metadata_demux_debug
#define GOTO_DONE_IF_NULL(ptr) \
do { if ( NULL == (ptr) ) goto done; } while(FALSE)
#define GOTO_DONE_IF_NULL_AND_FAIL(ptr, ret) \
do { if ( NULL == (ptr) ) { (ret) = FALSE; goto done; } } while(FALSE)
static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("image/jpeg, "
"tags-extracted = (bool) false;"
"image/png, " "tags-extracted = (bool) false")
);
static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("image/jpeg, "
"tags-extracted = (bool) true;"
"image/png, " "tags-extracted = (bool) true")
);
static GstMetadataDemuxClass *metadata_parent_class = NULL;
/*
* static helper functions declaration
*/
static gboolean
gst_metadata_demux_configure_srccaps (GstMetadataDemux * filter);
/*
* GObject callback functions declaration
*/
static void gst_metadata_demux_base_init (gpointer gclass);
static void gst_metadata_demux_class_init (GstMetadataDemuxClass * klass);
static void
gst_metadata_demux_init (GstMetadataDemux * filter,
GstMetadataDemuxClass * gclass);
static void gst_metadata_demux_dispose (GObject * object);
static void gst_metadata_demux_finalize (GObject * object);
static void gst_metadata_demux_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_metadata_demux_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
/*
* GstBaseMetadata virtual functions declaration
*/
static void gst_metadata_demux_send_tags (GstBaseMetadata * base);
static gboolean gst_metadata_demux_set_caps (GstPad * pad, GstCaps * caps);
static GstCaps *gst_metadata_demux_get_caps (GstPad * pad);
static gboolean gst_metadata_demux_sink_event (GstPad * pad, GstEvent * event);
/*
* GST BOILERPLATE
*/
GST_BOILERPLATE (GstMetadataDemux, gst_metadata_demux, GstBaseMetadata,
GST_TYPE_BASE_METADATA);
/*
* static helper functions implementation
*/
static gboolean
gst_metadata_demux_configure_srccaps (GstMetadataDemux * filter)
{
GstCaps *caps = NULL;
gboolean ret = FALSE;
gchar *mime = NULL;
switch (GST_BASE_METADATA_IMG_TYPE (filter)) {
case IMG_JPEG:
mime = "image/jpeg";
break;
case IMG_PNG:
mime = "image/png";
break;
default:
ret = FALSE;
goto done;
break;
}
caps =
gst_caps_new_simple (mime, "tags-extracted", G_TYPE_BOOLEAN, TRUE, NULL);
ret = gst_pad_set_caps (GST_BASE_METADATA_SRC_PAD (filter), caps);
done:
if (caps) {
gst_caps_unref (caps);
caps = NULL;
}
return ret;
}
/*
* GObject callback functions implementation
*/
static void
gst_metadata_demux_base_init (gpointer gclass)
{
/* *INDENT-OFF* */
static GstElementDetails element_details = {
"Metadata demuxer",
"Demuxer/Extracter/Metadata",
"Send metadata tags (EXIF, IPTC and XMP) and "
"remove metadata chunks from stream",
"Edgard Lima <edgard.lima@indt.org.br>"
};
/* *INDENT-ON* */
GstElementClass *element_class = GST_ELEMENT_CLASS (gclass);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_factory));
gst_element_class_set_details (element_class, &element_details);
}
static void
gst_metadata_demux_class_init (GstMetadataDemuxClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstBaseMetadataClass *gstbasemetadata_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstbasemetadata_class = (GstBaseMetadataClass *) klass;
metadata_parent_class = g_type_class_peek_parent (klass);
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_metadata_demux_dispose);
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_metadata_demux_finalize);
gobject_class->set_property = gst_metadata_demux_set_property;
gobject_class->get_property = gst_metadata_demux_get_property;
g_object_class_install_property (gobject_class, ARG_PARSE_ONLY,
g_param_spec_boolean ("parse-only", "parse-only",
"If TRUE, don't strip out any chunk", FALSE, G_PARAM_READWRITE));
gstbasemetadata_class->processing =
GST_DEBUG_FUNCPTR (gst_metadata_demux_send_tags);
gstbasemetadata_class->set_caps =
GST_DEBUG_FUNCPTR (gst_metadata_demux_set_caps);
gstbasemetadata_class->get_sink_caps =
GST_DEBUG_FUNCPTR (gst_metadata_demux_get_caps);
gstbasemetadata_class->get_src_caps =
GST_DEBUG_FUNCPTR (gst_metadata_demux_get_caps);
gstbasemetadata_class->sink_event =
GST_DEBUG_FUNCPTR (gst_metadata_demux_sink_event);
}
static void
gst_metadata_demux_init (GstMetadataDemux * filter,
GstMetadataDemuxClass * gclass)
{
GstElementClass *klass = GST_ELEMENT_GET_CLASS (filter);
gst_base_metadata_set_option_flag (GST_BASE_METADATA (filter),
META_OPT_EXIF | META_OPT_IPTC | META_OPT_XMP | META_OPT_DEMUX);
}
static void
gst_metadata_demux_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstMetadataDemux *filter = GST_METADATA_DEMUX (object);
switch (prop_id) {
case ARG_PARSE_ONLY:
if (g_value_get_boolean (value))
gst_base_metadata_set_option_flag (GST_BASE_METADATA (object),
META_OPT_PARSE_ONLY);
else
gst_base_metadata_unset_option_flag (GST_BASE_METADATA (object),
META_OPT_PARSE_ONLY);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_metadata_demux_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
guint8 option =
gst_base_metadata_get_option_flag (GST_BASE_METADATA (object));
switch (prop_id) {
case ARG_PARSE_ONLY:
g_value_set_boolean (value, option & META_OPT_PARSE_ONLY);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_metadata_demux_dispose (GObject * object)
{
GstMetadataDemux *filter = NULL;
G_OBJECT_CLASS (metadata_parent_class)->dispose (object);
}
static void
gst_metadata_demux_finalize (GObject * object)
{
G_OBJECT_CLASS (metadata_parent_class)->finalize (object);
}
/*
* GstBaseMetadata virtual functions implementation
*/
/*
* gst_metadata_demux_send_tags:
* @base: the base metadata instance
*
* Send individual tags as message to the bus and as event to the next
* element, and send the whole metadata chunk (with file specific wrapper
* striped) to the next element as a event.
*
* Returns: nothing
*
*/
static void
gst_metadata_demux_send_tags (GstBaseMetadata * base)
{
GstMetadataDemux *filter = GST_METADATA_DEMUX (base);
GstMessage *msg;
GstTagList *taglist = gst_tag_list_new ();
GstEvent *event;
GstPad *srcpad = GST_BASE_METADATA_SRC_PAD (filter);
/* get whole chunk */
if (gst_base_metadata_get_option_flag (base) & META_OPT_EXIF)
metadataparse_exif_tag_list_add (taglist, GST_TAG_MERGE_KEEP,
GST_BASE_METADATA_EXIF_ADAPTER (base), METADATA_TAG_MAP_WHOLECHUNK);
if (gst_base_metadata_get_option_flag (base) & META_OPT_IPTC)
metadataparse_iptc_tag_list_add (taglist, GST_TAG_MERGE_KEEP,
GST_BASE_METADATA_IPTC_ADAPTER (base), METADATA_TAG_MAP_WHOLECHUNK);
if (gst_base_metadata_get_option_flag (base) & META_OPT_XMP)
metadataparse_xmp_tag_list_add (taglist, GST_TAG_MERGE_KEEP,
GST_BASE_METADATA_XMP_ADAPTER (base), METADATA_TAG_MAP_WHOLECHUNK);
if (taglist && !gst_tag_list_is_empty (taglist)) {
msg =
gst_message_new_tag (GST_OBJECT (filter), gst_tag_list_copy (taglist));
gst_element_post_message (GST_ELEMENT (filter), msg);
event = gst_event_new_tag (taglist);
gst_pad_push_event (srcpad, event);
taglist = NULL;
}
if (!taglist)
taglist = gst_tag_list_new ();
/*get individual tags */
if (gst_base_metadata_get_option_flag (base) & META_OPT_EXIF)
metadataparse_exif_tag_list_add (taglist, GST_TAG_MERGE_KEEP,
GST_BASE_METADATA_EXIF_ADAPTER (base), METADATA_TAG_MAP_INDIVIDUALS);
if (gst_base_metadata_get_option_flag (base) & META_OPT_IPTC)
metadataparse_iptc_tag_list_add (taglist, GST_TAG_MERGE_KEEP,
GST_BASE_METADATA_IPTC_ADAPTER (base), METADATA_TAG_MAP_INDIVIDUALS);
if (gst_base_metadata_get_option_flag (base) & META_OPT_XMP)
metadataparse_xmp_tag_list_add (taglist, GST_TAG_MERGE_KEEP,
GST_BASE_METADATA_XMP_ADAPTER (base), METADATA_TAG_MAP_INDIVIDUALS);
if (taglist && !gst_tag_list_is_empty (taglist)) {
msg = gst_message_new_tag (GST_OBJECT (filter), taglist);
gst_element_post_message (GST_ELEMENT (filter), msg);
taglist = NULL;
}
if (taglist)
gst_tag_list_free (taglist);
}
static gboolean
gst_metadata_demux_set_caps (GstPad * pad, GstCaps * caps)
{
GstMetadataDemux *filter = NULL;
GstStructure *structure = NULL;
const gchar *mime = NULL;
gboolean ret = FALSE;
gboolean based = TRUE;
filter = GST_METADATA_DEMUX (gst_pad_get_parent (pad));
structure = gst_caps_get_structure (caps, 0);
mime = gst_structure_get_name (structure);
if (strcmp (mime, "image/jpeg") == 0) {
GST_BASE_METADATA_IMG_TYPE (filter) = IMG_JPEG;
} else if (strcmp (mime, "image/png") == 0) {
GST_BASE_METADATA_IMG_TYPE (filter) = IMG_PNG;
} else {
ret = FALSE;
goto done;
}
if (gst_structure_get_boolean (structure, "tags-extracted", &based)) {
if (based == TRUE) {
ret = FALSE;
goto done;
}
}
ret = gst_metadata_demux_configure_srccaps (filter);
done:
gst_object_unref (filter);
return ret;
}
static GstCaps *
gst_metadata_demux_get_caps (GstPad * pad)
{
GstMetadataDemux *filter = NULL;
GstPad *otherpad;
GstCaps *caps_new = NULL;
GstCaps *caps_otherpad_peer = NULL;
filter = GST_METADATA_DEMUX (gst_pad_get_parent (pad));
(GST_BASE_METADATA_SRC_PAD (filter) == pad) ?
(otherpad = GST_BASE_METADATA_SINK_PAD (filter)) :
(otherpad = GST_BASE_METADATA_SRC_PAD (filter));
caps_new = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
caps_otherpad_peer = gst_pad_get_allowed_caps (otherpad);
GOTO_DONE_IF_NULL (caps_otherpad_peer);
if (gst_caps_is_empty (caps_otherpad_peer)
|| gst_caps_is_any (caps_otherpad_peer)) {
goto done;
} else {
guint i;
guint caps_size = 0;
caps_size = gst_caps_get_size (caps_otherpad_peer);
gst_caps_unref (caps_new);
caps_new = gst_caps_new_empty ();
for (i = 0; i < caps_size; ++i) {
GstStructure *structure = NULL;
GstStructure *structure_new = NULL;
const gchar *mime = NULL;
structure = gst_caps_get_structure (caps_otherpad_peer, i);
mime = gst_structure_get_name (structure);
if (pad == GST_BASE_METADATA_SINK_PAD (filter)) {
structure_new =
gst_structure_new (mime, "tags-extracted", G_TYPE_BOOLEAN, FALSE,
NULL);
} else {
structure_new =
gst_structure_new (mime, "tags-extracted", G_TYPE_BOOLEAN, TRUE,
NULL);
}
gst_caps_append_structure (caps_new, structure_new);
}
}
done:
if (caps_otherpad_peer) {
gst_caps_unref (caps_otherpad_peer);
caps_otherpad_peer = NULL;
}
gst_object_unref (filter);
return caps_new;
}
static gboolean
gst_metadata_demux_sink_event (GstPad * pad, GstEvent * event)
{
return gst_pad_event_default (pad, event);
}
/*
* element plugin init function
*/
gboolean
gst_metadata_demux_plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (gst_metadata_demux_debug, "metadatademux", 0,
"Metadata demuxer");
return gst_element_register (plugin, "metadatademux",
GST_RANK_PRIMARY + 1, GST_TYPE_METADATA_DEMUX);
}