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Add some documentation.

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Original commit message from CVS:
Add some documentation.
This commit is contained in:
Edgard Lima 2008-01-23 16:35:34 +00:00
parent 59c9a6a6bd
commit 90f78abd15
12 changed files with 1458 additions and 943 deletions
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15
ChangeLog
View file

@ -1,3 +1,18 @@
2008-01-23 Edgard Lima <edgard.lima@indt.org.br>
* docs/plugins/Makefile.am:
* docs/plugins/gst-plugins-bad-plugins-docs.sgml:
* docs/plugins/gst-plugins-bad-plugins-sections.txt:
* ext/metadata/TODO:
* ext/metadata/gstbasemetadata.c:
* ext/metadata/gstbasemetadata.h:
* ext/metadata/gstmetadatademux.c:
* ext/metadata/gstmetadatademux.h:
* ext/metadata/gstmetadatamux.c:
* ext/metadata/gstmetadatamux.h:
* ext/metadata/metadatatags.c:
Add some documentation.
2008-01-23 Sebastian Dröge <slomo@circular-chaos.org>
* configure.ac:

3
docs/plugins/Makefile.am
View file

@ -106,6 +106,9 @@ EXTRA_HFILES = \
$(top_srcdir)/ext/ivorbis/vorbisdec.h \
$(top_srcdir)/ext/jack/gstjackaudiosink.h \
$(top_srcdir)/ext/musicbrainz/gsttrm.h \
$(top_srcdir)/ext/metadata/gstbasemetadata.h \
$(top_srcdir)/ext/metadata/gstmetadatademux.h \
$(top_srcdir)/ext/metadata/gstmetadatamux.h \
$(top_srcdir)/ext/mythtv/gstmythtvsrc.h \
$(top_srcdir)/ext/sdl/sdlaudiosink.h \
$(top_srcdir)/ext/sdl/sdlvideosink.h \

2
docs/plugins/gst-plugins-bad-plugins-docs.sgml
View file

@ -38,6 +38,8 @@
<xi:include href="xml/element-ivorbisdec.xml" />
<xi:include href="xml/element-jackaudiosink.xml" />
<xi:include href="xml/element-lpwsinc.xml" />
<xi:include href="xml/element-metadatademux.xml" />
<xi:include href="xml/element-metadatamux.xml" />
<xi:include href="xml/element-modplug.xml" />
<xi:include href="xml/element-multifilesink.xml" />
<xi:include href="xml/element-multifilesrc.xml" />

28
docs/plugins/gst-plugins-bad-plugins-sections.txt
View file

@ -312,6 +312,34 @@ GST_TYPE_JACK_AUDIO_SINK
gst_jack_audio_sink_get_type
</SECTION>
<SECTION>
<FILE>element-metadatademux</FILE>
<TITLE>metadatademux</TITLE>
GstMetadataDemux
<SUBSECTION Standard>
GstMetadataDemuxClass
GST_METADATA_DEMUX
GST_METADATA_DEMUX_CLASS
GST_IS_METADATA_DEMUX
GST_IS_METADATA_DEMUX_CLASS
GST_TYPE_METADATA_DEMUX
gst_metadata_demux_get_type
</SECTION>
<SECTION>
<FILE>element-metadatamux</FILE>
<TITLE>metadatamux</TITLE>
GstMetadataMux
<SUBSECTION Standard>
GstMetadataMuxClass
GST_METADATA_MUX
GST_METADATA_MUX_CLASS
GST_IS_METADATA_MUX
GST_IS_METADATA_MUX_CLASS
GST_TYPE_METADATA_MUX
gst_metadata_mux_get_type
</SECTION>
<SECTION>
<FILE>element-modplug</FILE>
<TITLE>modplug</TITLE>

1
ext/metadata/TODO
View file

@ -22,6 +22,7 @@ OPEN ISSUES:
4- Add GST_TYPE_FRACTION support for GStreamer TAGS
5- currently, in JPEG files, if there is a Photoshop segment, everything inside it but IPTC will be lost. From the point of view of implementation it is easy, but I still don't now how to solve from the point of view of "designing". Anyway I think it is not so important.
6- language is not considered in XMP (How to do it with GStreamer?)
7- Add a helper function that convert from value to string. For example, aperture-size is 2.7 and the app wants to show "f/2.7", 'contrast' is a range and the app wants to show as "Normal", "Soft", "Hard". For the time being it is up to the APP to make this conversion.
KNOWN BUGS

1562
ext/metadata/gstbasemetadata.c
View file

File diff suppressed because it is too large Load diff

30
ext/metadata/gstbasemetadata.h
View file

@ -49,14 +49,20 @@
G_BEGIN_DECLS
/* #defines don't like whitespacey bits */
#define GST_TYPE_BASE_METADATA (gst_base_metadata_get_type())
#define GST_BASE_METADATA(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_BASE_METADATA,GstBaseMetadata))
#define GST_BASE_METADATA_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_BASE_METADATA,GstBaseMetadataClass))
#define GST_BASE_METADATA_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_BASE_METADATA, GstBaseMetadataClass))
#define GST_IS_BASE_METADATA(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_BASE_METADATA))
#define GST_IS_BASE_METADATA_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_BASE_METADATA))
#define GST_BASE_METADATA_CAST(obj) ((GstBaseMetadata *)(obj))
/* *INDENT-OFF* */
#define GST_TYPE_BASE_METADATA (gst_base_metadata_get_type())
#define GST_BASE_METADATA(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),\
GST_TYPE_BASE_METADATA,GstBaseMetadata))
#define GST_BASE_METADATA_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),\
GST_TYPE_BASE_METADATA,GstBaseMetadataClass))
#define GST_BASE_METADATA_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj),\
GST_TYPE_BASE_METADATA, GstBaseMetadataClass))
#define GST_IS_BASE_METADATA(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),\
GST_TYPE_BASE_METADATA))
#define GST_IS_BASE_METADATA_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),\
GST_TYPE_BASE_METADATA))
#define GST_BASE_METADATA_CAST(obj) ((GstBaseMetadata *)(obj))
/* *INDENT-ON* */
typedef struct _GstBaseMetadata GstBaseMetadata;
typedef struct _GstBaseMetadataClass GstBaseMetadataClass;
@ -98,7 +104,6 @@ typedef enum _tag_MetadataState
/**
* GstBaseMetadata:
* @element: the parent element.
*
* The opaque #GstBaseMetadata data structure.
*/
@ -165,11 +170,8 @@ extern MetaOptions
gst_base_metadata_get_option_flag(const GstBaseMetadata *base);
extern void
gst_base_metadata_update_segment_with_new_buffer (GstBaseMetadata *base,
guint8 ** buf, guint32 * size, MetadataChunkType type);
extern void
gst_base_metadata_chunk_array_remove_zero_size (GstBaseMetadata *base);
gst_base_metadata_update_inject_segment_with_new_data (GstBaseMetadata *base,
guint8 ** data, guint32 * size, MetadataChunkType type);
G_END_DECLS
#endif /* __GST_BASE_METADATA_H__ */

226
ext/metadata/gstmetadatademux.c
View file

@ -42,18 +42,57 @@
*/
/**
* SECTION:metadatademux-metadata
* 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
* 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
@ -70,16 +109,13 @@
#include <string.h>
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)
/*
* enum and types
*/
/* Filter signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
@ -89,6 +125,19 @@ enum
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,
@ -105,35 +154,113 @@ static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
"image/png, " "tags-extracted = (bool) true")
);
GST_BOILERPLATE (GstMetadataDemux, gst_metadata_demux, GstBaseMetadata,
GST_TYPE_BASE_METADATA);
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);
static GstCaps *gst_metadata_demux_get_caps (GstPad * pad);
static gboolean gst_metadata_demux_set_caps (GstPad * pad, GstCaps * caps);
static gboolean gst_metadata_demux_sink_event (GstPad * pad, GstEvent * event);
/*
* 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 demuxr",
"Demuxr/Extracter/Metadata",
"Send metadata tags (EXIF, IPTC and XMP) and remove metadata chunks from stream",
"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,
@ -143,7 +270,6 @@ gst_metadata_demux_base_init (gpointer gclass)
gst_element_class_set_details (element_class, &element_details);
}
/* initialize the plugin's class */
static void
gst_metadata_demux_class_init (GstMetadataDemuxClass * klass)
{
@ -180,11 +306,6 @@ gst_metadata_demux_class_init (GstMetadataDemuxClass * klass)
}
/* initialize the new element
* instantiate pads and add them to element
* set functions
* initialize structure
*/
static void
gst_metadata_demux_init (GstMetadataDemux * filter,
GstMetadataDemuxClass * gclass)
@ -250,6 +371,23 @@ 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)
{
@ -260,6 +398,8 @@ gst_metadata_demux_send_tags (GstBaseMetadata * base)
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);
@ -284,6 +424,8 @@ gst_metadata_demux_send_tags (GstBaseMetadata * base)
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);
@ -306,44 +448,6 @@ gst_metadata_demux_send_tags (GstBaseMetadata * base)
}
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;
}
/* this function handles the link with other elements */
static gboolean
gst_metadata_demux_set_caps (GstPad * pad, GstCaps * caps)
{

17
ext/metadata/gstmetadatademux.h
View file

@ -49,23 +49,34 @@
#include "gstbasemetadata.h"
G_BEGIN_DECLS
/* #defines don't like whitespacey bits */
/* *INDENT-OFF* */
#define GST_TYPE_METADATA_DEMUX \
(gst_metadata_demux_get_type())
#define GST_METADATA_DEMUX(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_METADATA_DEMUX,GstMetadataDemux))
#define GST_METADATA_DEMUX_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_METADATA_DEMUX,GstMetadataDemuxClass))
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_METADATA_DEMUX,\
GstMetadataDemuxClass))
#define GST_IS_METADATA_DEMUX(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_METADATA_DEMUX))
#define GST_IS_METADATA_DEMUX_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_METADATA_DEMUX))
/* *INDENT-ON* */
typedef struct _GstMetadataDemux GstMetadataDemux;
typedef struct _GstMetadataDemuxClass GstMetadataDemuxClass;
/**
* GstMetadataDemux:
*
* The opaque #GstMetadataDemux data structure.
*/
struct _GstMetadataDemux
{
GstBaseMetadata element;
GstBaseMetadata metadata;
};
struct _GstMetadataDemuxClass

444
ext/metadata/gstmetadatamux.c
View file

@ -42,18 +42,40 @@
*/
/**
* SECTION:metadatamux-metadata
* SECTION: element-metadatamux
*
* <refsect2>
* <para>
* This element writes tags into metadata (EXIF, IPTC and XMP) chunks, and
* writes the chunks into image files (JPEG, PNG). Tags the are received as
* GST_EVENT_TAG event or set by the application using #GstTagSetter interface.
* </para>
* <title>Example launch line</title>
* <para>
* <programlisting>
* gst-launch -v -m filesrc location=./test.jpeg ! metadatamux ! fakesink silent=TRUE
* gst-launch -v -m filesrc location=orig.jpeg ! metadatamux ! filesink
* location=dest.jpeg
* </programlisting>
* <programlisting>
* gst-launch -v -m filesrc location=orig.png ! metadatademux ! pngdec !
* ffmpegcolorspace ! jpegenc ! metadatamux ! filesink location=dest.jpeg
* </programlisting>
* </para>
* <title>How it works</title>
* <para>
* If this element receives a GST_TAG_EXIF, GST_TAG_IPTC or GST_TAG_XMP which
* are whole chunk metadata tags, then this whole chunk will be modified by
* individual tags received and written to the file. Otherwise, a new chunk
* will be created from the scratch and then modified in same way.
* </para>
* </refsect2>
*/
/*
* includes
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
@ -70,26 +92,35 @@
#include <string.h>
GST_DEBUG_CATEGORY_STATIC (gst_metadata_mux_debug);
#define GST_CAT_DEFAULT gst_metadata_mux_debug
/*
* enum and types
*/
#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)
/* Filter signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0,
ARG_PARSE_ONLY
};
/*
* defines and static global vars
*/
GST_DEBUG_CATEGORY_STATIC (gst_metadata_mux_debug);
#define GST_CAT_DEFAULT gst_metadata_mux_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,
@ -103,6 +134,51 @@ static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
GST_STATIC_CAPS ("image/jpeg; " "image/png")
);
static GstMetadataMuxClass *metadata_parent_class = NULL;
/*
* static helper functions declaration
*/
static gboolean gst_metadata_mux_configure_srccaps (GstMetadataMux * filter);
/*
* GObject callback functions declaration
*/
static void gst_metadata_mux_base_init (gpointer gclass);
static void gst_metadata_mux_class_init (GstMetadataMuxClass * klass);
static void
gst_metadata_mux_init (GstMetadataMux * filter, GstMetadataMuxClass * gclass);
static void gst_metadata_mux_dispose (GObject * object);
static void gst_metadata_mux_finalize (GObject * object);
static void gst_metadata_mux_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_metadata_mux_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
/*
* GstBaseMetadata virtual functions declaration
*/
static void gst_metadata_mux_create_chunks_from_tags (GstBaseMetadata * base);
static gboolean gst_metadata_mux_set_caps (GstPad * pad, GstCaps * caps);
static GstCaps *gst_metadata_mux_get_caps (GstPad * pad);
static gboolean gst_metadata_mux_sink_event (GstPad * pad, GstEvent * event);
/*
* GST BOILERPLATE
*/
static void
gst_metadata_mux_add_interfaces (GType type)
{
@ -115,188 +191,10 @@ gst_metadata_mux_add_interfaces (GType type)
GST_BOILERPLATE_FULL (GstMetadataMux, gst_metadata_mux, GstBaseMetadata,
GST_TYPE_BASE_METADATA, gst_metadata_mux_add_interfaces);
static GstMetadataMuxClass *metadata_parent_class = NULL;
static void gst_metadata_mux_dispose (GObject * object);
static void gst_metadata_mux_finalize (GObject * object);
static void gst_metadata_mux_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_metadata_mux_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstCaps *gst_metadata_mux_get_caps (GstPad * pad);
static gboolean gst_metadata_mux_set_caps (GstPad * pad, GstCaps * caps);
static gboolean gst_metadata_mux_sink_event (GstPad * pad, GstEvent * event);
static void gst_metadata_mux_create_chunks_from_tags (GstBaseMetadata * base);
static void
gst_metadata_mux_base_init (gpointer gclass)
{
static GstElementDetails element_details = {
"Metadata muxr",
"Muxr/Extracter/Metadata",
"Send metadata tags (EXIF, IPTC and XMP) and remove metadata chunks from stream",
"Edgard Lima <edgard.lima@indt.org.br>"
};
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);
}
/* initialize the plugin's class */
static void
gst_metadata_mux_class_init (GstMetadataMuxClass * 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_mux_dispose);
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_metadata_mux_finalize);
gobject_class->set_property = gst_metadata_mux_set_property;
gobject_class->get_property = gst_metadata_mux_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_mux_create_chunks_from_tags);
gstbasemetadata_class->set_caps =
GST_DEBUG_FUNCPTR (gst_metadata_mux_set_caps);
gstbasemetadata_class->get_sink_caps =
GST_DEBUG_FUNCPTR (gst_metadata_mux_get_caps);
gstbasemetadata_class->get_src_caps =
GST_DEBUG_FUNCPTR (gst_metadata_mux_get_caps);
gstbasemetadata_class->sink_event =
GST_DEBUG_FUNCPTR (gst_metadata_mux_sink_event);
}
/* initialize the new element
* instantiate pads and add them to element
* set functions
* initialize structure
/*
* static helper functions implementation
*/
static void
gst_metadata_mux_init (GstMetadataMux * filter, GstMetadataMuxClass * 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_MUX);
}
static void
gst_metadata_mux_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstMetadataMux *filter = GST_METADATA_MUX (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_mux_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_mux_dispose (GObject * object)
{
GstMetadataMux *filter = NULL;
G_OBJECT_CLASS (metadata_parent_class)->dispose (object);
}
static void
gst_metadata_mux_finalize (GObject * object)
{
G_OBJECT_CLASS (metadata_parent_class)->finalize (object);
}
static void
gst_metadata_mux_create_chunks_from_tags (GstBaseMetadata * base)
{
GstMetadataMux *filter = GST_METADATA_MUX (base);
GstMessage *msg;
GstTagSetter *setter = GST_TAG_SETTER (filter);
const GstTagList *taglist = gst_tag_setter_get_tag_list (setter);
GstEvent *event;
guint8 *buf = NULL;
guint32 size = 0;
if (taglist) {
if (gst_base_metadata_get_option_flag (base) & META_OPT_EXIF) {
metadatamux_exif_create_chunk_from_tag_list (&buf, &size, taglist);
gst_base_metadata_update_segment_with_new_buffer (base, &buf, &size,
MD_CHUNK_EXIF);
}
if (gst_base_metadata_get_option_flag (base) & META_OPT_IPTC) {
metadatamux_iptc_create_chunk_from_tag_list (&buf, &size, taglist);
gst_base_metadata_update_segment_with_new_buffer (base, &buf, &size,
MD_CHUNK_IPTC);
}
if (gst_base_metadata_get_option_flag (base) & META_OPT_XMP) {
metadatamux_xmp_create_chunk_from_tag_list (&buf, &size, taglist);
gst_base_metadata_update_segment_with_new_buffer (base, &buf, &size,
MD_CHUNK_XMP);
}
}
if (buf) {
g_free (buf);
}
gst_base_metadata_chunk_array_remove_zero_size (base);
}
static gboolean
gst_metadata_mux_configure_srccaps (GstMetadataMux * filter)
@ -333,8 +231,172 @@ done:
}
/*
* GObject callback functions declaration
*/
static void
gst_metadata_mux_base_init (gpointer gclass)
{
/* *INDENT-OFF* */
static GstElementDetails element_details = {
"Metadata muxer",
"Muxer/Extracter/Metadata",
"Write metadata (EXIF, IPTC and XMP) into a image 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_mux_class_init (GstMetadataMuxClass * 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_mux_dispose);
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_metadata_mux_finalize);
gobject_class->set_property = gst_metadata_mux_set_property;
gobject_class->get_property = gst_metadata_mux_get_property;
gstbasemetadata_class->processing =
GST_DEBUG_FUNCPTR (gst_metadata_mux_create_chunks_from_tags);
gstbasemetadata_class->set_caps =
GST_DEBUG_FUNCPTR (gst_metadata_mux_set_caps);
gstbasemetadata_class->get_sink_caps =
GST_DEBUG_FUNCPTR (gst_metadata_mux_get_caps);
gstbasemetadata_class->get_src_caps =
GST_DEBUG_FUNCPTR (gst_metadata_mux_get_caps);
gstbasemetadata_class->sink_event =
GST_DEBUG_FUNCPTR (gst_metadata_mux_sink_event);
}
static void
gst_metadata_mux_init (GstMetadataMux * filter, GstMetadataMuxClass * 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_MUX);
}
static void
gst_metadata_mux_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstMetadataMux *filter = GST_METADATA_MUX (object);
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_metadata_mux_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) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_metadata_mux_dispose (GObject * object)
{
GstMetadataMux *filter = NULL;
G_OBJECT_CLASS (metadata_parent_class)->dispose (object);
}
static void
gst_metadata_mux_finalize (GObject * object)
{
G_OBJECT_CLASS (metadata_parent_class)->finalize (object);
}
/*
* GstBaseMetadata virtual functions implementation
*/
/*
* gst_metadata_mux_create_chunks_from_tags:
* @base: the base metadata instance
*
* This function creates new metadata (EXIF, IPTC, XMP) chunks with the tags
* received and add it to the list of segments that will be injected to the
* resulting file by #GstBaseMetadata.
*
* Returns: nothing
*
*/
static void
gst_metadata_mux_create_chunks_from_tags (GstBaseMetadata * base)
{
GstMetadataMux *filter = GST_METADATA_MUX (base);
GstMessage *msg;
GstTagSetter *setter = GST_TAG_SETTER (filter);
const GstTagList *taglist = gst_tag_setter_get_tag_list (setter);
GstEvent *event;
guint8 *buf = NULL;
guint32 size = 0;
if (taglist) {
if (gst_base_metadata_get_option_flag (base) & META_OPT_EXIF) {
metadatamux_exif_create_chunk_from_tag_list (&buf, &size, taglist);
gst_base_metadata_update_inject_segment_with_new_data (base, &buf, &size,
MD_CHUNK_EXIF);
}
if (gst_base_metadata_get_option_flag (base) & META_OPT_IPTC) {
metadatamux_iptc_create_chunk_from_tag_list (&buf, &size, taglist);
gst_base_metadata_update_inject_segment_with_new_data (base, &buf, &size,
MD_CHUNK_IPTC);
}
if (gst_base_metadata_get_option_flag (base) & META_OPT_XMP) {
metadatamux_xmp_create_chunk_from_tag_list (&buf, &size, taglist);
gst_base_metadata_update_inject_segment_with_new_data (base, &buf, &size,
MD_CHUNK_XMP);
}
}
if (buf) {
g_free (buf);
}
}
/* this function handles the link with other elements */
static gboolean
gst_metadata_mux_set_caps (GstPad * pad, GstCaps * caps)
{

13
ext/metadata/gstmetadatamux.h
View file

@ -49,7 +49,8 @@
#include "gstbasemetadata.h"
G_BEGIN_DECLS
/* #defines don't like whitespacey bits */
/* *INDENT-OFF* */
#define GST_TYPE_METADATA_MUX \
(gst_metadata_mux_get_type())
#define GST_METADATA_MUX(obj) \
@ -60,12 +61,20 @@ G_BEGIN_DECLS
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_METADATA_MUX))
#define GST_IS_METADATA_MUX_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_METADATA_MUX))
/* *INDENT-ON* */
typedef struct _GstMetadataMux GstMetadataMux;
typedef struct _GstMetadataMuxClass GstMetadataMuxClass;
/**
* GstMetadataMux:
*
* The opaque #GstMetadataMux data structure.
*/
struct _GstMetadataMux
{
GstBaseMetadata element;
GstBaseMetadata metadata;
};
struct _GstMetadataMuxClass

60
ext/metadata/metadatatags.c
View file

@ -83,34 +83,34 @@ metadata_tags_exif_register (void)
gst_tag_register (GST_TAG_CAPTURE_FNUMBER, GST_TAG_FLAG_META,
GST_TYPE_FRACTION, GST_TAG_CAPTURE_FNUMBER, "F number (focal ratio)",
NULL);
/**
0 - not defined
1- Manual
2- Normal program
3- Aperture priority
4- Shutter priority
5- Creative program (biased toward death of field)
6- Action program (biased toward fast shutter speed)
7- Portrait mode (for closeup photos with the background out of focus)
8- Landscape mode (for landscape photos with the background in focus)
*** exif is until here ***
9- Night
10- Back-light
11- Spotlight
12- Snow
13- Beach
*/
/*
0 - not defined
1- Manual
2- Normal program
3- Aperture priority
4- Shutter priority
5- Creative program (biased toward death of field)
6- Action program (biased toward fast shutter speed)
7- Portrait mode (for closeup photos with the background out of focus)
8- Landscape mode (for landscape photos with the background in focus)
*** exif is until here ***
9- Night
10- Back-light
11- Spotlight
12- Snow
13- Beach
*/
gst_tag_register (GST_TAG_CAPTURE_EXPOSURE_PROGRAM, GST_TAG_FLAG_META,
G_TYPE_UINT, GST_TAG_CAPTURE_EXPOSURE_PROGRAM,
"Class of program used for exposure", NULL);
/** The unit is the APEX value.
Ordinarily it is given in the range of -99.99 to 99.99.
if numerator is 0xFFFFFFFF means unknown
*/
/* The unit is the APEX value.
Ordinarily it is given in the range of -99.99 to 99.99.
if numerator is 0xFFFFFFFF means unknown
*/
gst_tag_register (GST_TAG_CAPTURE_BRIGHTNESS, GST_TAG_FLAG_META,
GST_TYPE_FRACTION, GST_TAG_CAPTURE_BRIGHTNESS,
"Brightness (APEX from -99.99 to 99.99)", NULL);
/**
/*
0- Auto
1- Off
*** exif is until here ***
@ -122,39 +122,39 @@ metadata_tags_exif_register (void)
7- Incandescent
8- Flash
9- Horizon (sun on the horizon)
*/
*/
gst_tag_register (GST_TAG_CAPTURE_WHITE_BALANCE, GST_TAG_FLAG_META,
G_TYPE_UINT, GST_TAG_CAPTURE_WHITE_BALANCE, "White balance mode", NULL);
/** if Zero ZOOM not used
/* if Zero ZOOM not used
*/
gst_tag_register (GST_TAG_CAPTURE_DIGITAL_ZOOM, GST_TAG_FLAG_META,
GST_TYPE_FRACTION, GST_TAG_CAPTURE_DIGITAL_ZOOM, "Digital zoom ratio",
NULL);
/**
/*
0- None
1- Low gain up
2- High gain up
3- Low gain down
4- High gain down
*/
*/
gst_tag_register (GST_TAG_CAPTURE_GAIN, GST_TAG_FLAG_META, G_TYPE_UINT,
GST_TAG_CAPTURE_GAIN, "", NULL);
/**
/*
from -100 to 100
[-100, -34] - soft
[-33, 33] - normal
[34, 100] - hard
*** exif is just 0, 1, 2 (normal, soft and hard)
*/
*/
gst_tag_register (GST_TAG_CAPTURE_CONTRAST, GST_TAG_FLAG_META, G_TYPE_INT,
GST_TAG_CAPTURE_CONTRAST, "", NULL);
/**
/*
from -100 to 100
[-100, -34] - low
[-33, 33] - normal
[34, 100] - high
*** exif is just 0, 1, 2 (normal, low and high)
*/
*/
gst_tag_register (GST_TAG_CAPTURE_SATURATION, GST_TAG_FLAG_META, G_TYPE_INT,
GST_TAG_CAPTURE_SATURATION, "", NULL);