From 6836fdea8367cdcaea53505a5a9ff93909b103d8 Mon Sep 17 00:00:00 2001 From: Edgard Lima Date: Tue, 30 Oct 2007 12:49:04 +0000 Subject: Created new plugin ('medadata') and element ('metadataparse') that extract metadata from images (look at bug #486659). Original commit message from CVS: Created new plugin ('medadata') and element ('metadataparse') that extract metadata from images (look at bug #486659). --- ext/metadata/gstmetadataparse.c | 914 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 914 insertions(+) create mode 100644 ext/metadata/gstmetadataparse.c (limited to 'ext/metadata/gstmetadataparse.c') diff --git a/ext/metadata/gstmetadataparse.c b/ext/metadata/gstmetadataparse.c new file mode 100644 index 00000000..d40384c8 --- /dev/null +++ b/ext/metadata/gstmetadataparse.c @@ -0,0 +1,914 @@ +/* + * GStreamer + * Copyright 2007 Edgard Lima + * + * 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:metadataparse-metadata + * + * + * Example launch line + * + * + * gst-launch -v -m filesrc location=./test.jpeg ! metadataparse ! fakesink silent=TRUE + * + * + * + */ + +#ifdef HAVE_CONFIG_H +# include +#endif + +#include + +#include "gstmetadataparse.h" + + +#include "metadataparseexif.h" + +#include "metadataparseiptc.h" + +#include "metadataparsexmp.h" + +#include + +GST_DEBUG_CATEGORY_STATIC (gst_metadata_parse_debug); +#define GST_CAT_DEFAULT gst_metadata_parse_debug + +GST_DEBUG_CATEGORY_EXTERN (gst_metadata_parse_exif_debug); +GST_DEBUG_CATEGORY_EXTERN (gst_metadata_parse_iptc_debug); +GST_DEBUG_CATEGORY_EXTERN (gst_metadata_parse_xmp_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) + +/* Filter signals and args */ +enum +{ + /* FILL ME */ + LAST_SIGNAL +}; + +enum +{ + ARG_0, + ARG_EXIF, + ARG_IPTC, + ARG_XMP +}; + +static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink", + GST_PAD_SINK, + GST_PAD_ALWAYS, + GST_STATIC_CAPS ("image/jpeg;" "image/png") + ); + +static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src", + GST_PAD_SRC, + GST_PAD_ALWAYS, + GST_STATIC_CAPS ("image/jpeg-metadata;" "image/png-metadata") + ); + +GST_BOILERPLATE (GstMetadataParse, gst_metadata_parse, GstElement, + GST_TYPE_ELEMENT); + +static GstMetadataParseClass *metadata_parent_class = NULL; + +static void gst_metadata_parse_dispose (GObject * object); + +static void gst_metadata_parse_finalize (GObject * object); + +static void gst_metadata_parse_set_property (GObject * object, guint prop_id, + const GValue * value, GParamSpec * pspec); +static void gst_metadata_parse_get_property (GObject * object, guint prop_id, + GValue * value, GParamSpec * pspec); + +static GstStateChangeReturn +gst_metadata_parse_change_state (GstElement * element, + GstStateChange transition); + +static GstCaps *gst_metadata_parse_get_caps (GstPad * pad); +static gboolean gst_metadata_parse_set_caps (GstPad * pad, GstCaps * caps); +static gboolean gst_metadata_parse_src_event (GstPad * pad, GstEvent * event); +static gboolean gst_metadata_parse_sink_event (GstPad * pad, GstEvent * event); + +static GstFlowReturn gst_metadata_parse_chain (GstPad * pad, GstBuffer * buf); + +static gboolean +gst_metadata_parse_get_range (GstPad * pad, guint64 offset, guint size, + GstBuffer ** buf); + +static gboolean gst_metadata_parse_activate (GstPad * pad); + +static void gst_metadata_parse_init_members (GstMetadataParse * filter); +static void gst_metadata_parse_dispose_members (GstMetadataParse * filter); + +static gboolean +gst_metadata_parse_configure_srccaps (GstMetadataParse * filter); +static gboolean gst_metadata_parse_configure_caps (GstMetadataParse * filter); + +static int +gst_metadata_parse_parse (GstMetadataParse * filter, const guint8 * buf, + guint32 size); + +static void +gst_metadata_parse_base_init (gpointer gclass) +{ + static GstElementDetails element_details = { + "Metadata parser", + "Image/Extracter/Metadata", + "Send metadata tags (EXIF, IPTC and XMP) while passing throught the contents", + "Edgard Lima " + }; + 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_parse_class_init (GstMetadataParseClass * klass) +{ + GObjectClass *gobject_class; + GstElementClass *gstelement_class; + + gobject_class = (GObjectClass *) klass; + gstelement_class = (GstElementClass *) klass; + + metadata_parent_class = g_type_class_peek_parent (klass); + + gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_metadata_parse_dispose); + gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_metadata_parse_finalize); + + gobject_class->set_property = gst_metadata_parse_set_property; + gobject_class->get_property = gst_metadata_parse_get_property; + + g_object_class_install_property (gobject_class, ARG_EXIF, + g_param_spec_boolean ("exif", "EXIF", "Send EXIF metadata ?", + TRUE, G_PARAM_READWRITE)); + + g_object_class_install_property (gobject_class, ARG_IPTC, + g_param_spec_boolean ("iptc", "IPTC", "Send IPTC metadata ?", + TRUE, G_PARAM_READWRITE)); + + g_object_class_install_property (gobject_class, ARG_XMP, + g_param_spec_boolean ("xmp", "XMP", "Send XMP metadata ?", + TRUE, G_PARAM_READWRITE)); + + gstelement_class->change_state = gst_metadata_parse_change_state; + +} + +/* initialize the new element + * instantiate pads and add them to element + * set functions + * initialize structure + */ +static void +gst_metadata_parse_init (GstMetadataParse * filter, + GstMetadataParseClass * gclass) +{ + GstElementClass *klass = GST_ELEMENT_GET_CLASS (filter); + + /* sink pad */ + + filter->sinkpad = + gst_pad_new_from_template (gst_element_class_get_pad_template (klass, + "sink"), "sink"); + gst_pad_set_setcaps_function (filter->sinkpad, + GST_DEBUG_FUNCPTR (gst_metadata_parse_set_caps)); + gst_pad_set_getcaps_function (filter->sinkpad, + GST_DEBUG_FUNCPTR (gst_metadata_parse_get_caps)); + gst_pad_set_event_function (filter->sinkpad, gst_metadata_parse_sink_event); + gst_pad_set_chain_function (filter->sinkpad, + GST_DEBUG_FUNCPTR (gst_metadata_parse_chain)); + gst_pad_set_activate_function (filter->sinkpad, gst_metadata_parse_activate); + + /* source pad */ + + filter->srcpad = + gst_pad_new_from_template (gst_element_class_get_pad_template (klass, + "src"), "src"); + gst_pad_set_getcaps_function (filter->srcpad, + GST_DEBUG_FUNCPTR (gst_metadata_parse_get_caps)); + gst_pad_set_event_function (filter->srcpad, gst_metadata_parse_src_event); + gst_pad_use_fixed_caps (filter->srcpad); + gst_pad_set_getrange_function (filter->srcpad, gst_metadata_parse_get_range); + + /* addind pads */ + + gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad); + gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad); + + /* init members */ + + gst_metadata_parse_init_members (filter); + +} + +static void +gst_metadata_parse_set_property (GObject * object, guint prop_id, + const GValue * value, GParamSpec * pspec) +{ + GstMetadataParse *filter = GST_METADATA_PARSE (object); + + switch (prop_id) { + case ARG_EXIF: + if (g_value_get_boolean (value)) + set_parse_option (filter->parse_data, PARSE_OPT_EXIF); + else + unset_parse_option (filter->parse_data, PARSE_OPT_EXIF); + break; + case ARG_IPTC: + if (g_value_get_boolean (value)) + set_parse_option (filter->parse_data, PARSE_OPT_IPTC); + else + unset_parse_option (filter->parse_data, PARSE_OPT_IPTC); + break; + case ARG_XMP: + if (g_value_get_boolean (value)) + set_parse_option (filter->parse_data, PARSE_OPT_XMP); + else + unset_parse_option (filter->parse_data, PARSE_OPT_XMP); + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); + break; + } +} + +static void +gst_metadata_parse_get_property (GObject * object, guint prop_id, + GValue * value, GParamSpec * pspec) +{ + GstMetadataParse *filter = GST_METADATA_PARSE (object); + + switch (prop_id) { + case ARG_EXIF: + g_value_set_boolean (value, + PARSE_DATA_OPTION (filter->parse_data) & PARSE_OPT_EXIF); + break; + case ARG_IPTC: + g_value_set_boolean (value, + PARSE_DATA_OPTION (filter->parse_data) & PARSE_OPT_IPTC); + break; + case ARG_XMP: + g_value_set_boolean (value, + PARSE_DATA_OPTION (filter->parse_data) & PARSE_OPT_XMP); + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); + break; + } +} + +/* GstElement vmethod implementations */ + +static GstCaps * +gst_metadata_parse_get_caps (GstPad * pad) +{ + GstMetadataParse *filter = NULL; + GstPad *otherpad; + GstCaps *caps_new = NULL; + GstCaps *caps_otherpad_peer = NULL; + + filter = GST_METADATA_PARSE (gst_pad_get_parent (pad)); + + (filter->srcpad == pad) ? (otherpad = filter->sinkpad) : (otherpad = + filter->srcpad); + + 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; + GString *mime = NULL; + + structure = gst_caps_get_structure (caps_otherpad_peer, i); + + mime = g_string_new (gst_structure_get_name (structure)); + if (otherpad == filter->sinkpad) { + g_string_append (mime, "-metadata"); + } else { + /* strip ou "-metadata" */ + mime->str[mime->len - 9] = '\0'; + } + + structure_new = gst_structure_empty_new (mime->str); + + gst_caps_append_structure (caps_new, structure_new); + + g_string_free (mime, TRUE); + + } + + } + +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_parse_src_event (GstPad * pad, GstEvent * event) +{ + GstMetadataParse *filter = NULL; + gboolean ret = FALSE; + + filter = GST_METADATA_PARSE (gst_pad_get_parent (pad)); + + switch (GST_EVENT_TYPE (event)) { + case GST_EVENT_SEEK: + if (filter->state != MT_STATE_PARSED) { + /* FIXME: What to do here */ + ret = TRUE; + goto done; + } + break; + default: + break; + } + + ret = gst_pad_event_default (pad, event); + event = NULL; /* event has another owner */ + +done: + + if (event) { + gst_event_unref (event); + } + + gst_object_unref (filter); + + return ret; + +} + +static gboolean +gst_metadata_parse_sink_event (GstPad * pad, GstEvent * event) +{ + GstMetadataParse *filter = NULL; + gboolean ret = FALSE; + + filter = GST_METADATA_PARSE (gst_pad_get_parent (pad)); + + switch (GST_EVENT_TYPE (event)) { + case GST_EVENT_EOS: + if (filter->need_more_data) { + GST_ELEMENT_WARNING (filter, STREAM, DEMUX, (NULL), + ("Need more data. Unexpected EOS")); + } + break; + case GST_EVENT_TAG: + break; + default: + break; + } + + ret = gst_pad_event_default (pad, event); + + gst_object_unref (filter); + + return ret; + +} + +static void +gst_metadata_parse_dispose (GObject * object) +{ + GstMetadataParse *filter = NULL; + + filter = GST_METADATA_PARSE (object); + + gst_metadata_parse_dispose_members (filter); + + G_OBJECT_CLASS (metadata_parent_class)->dispose (object); +} + +static void +gst_metadata_parse_finalize (GObject * object) +{ + G_OBJECT_CLASS (metadata_parent_class)->finalize (object); +} + +static void +gst_metadata_parse_dispose_members (GstMetadataParse * filter) +{ + metadataparse_dispose (&filter->parse_data); + if (filter->adapter) { + gst_object_unref (filter->adapter); + filter->adapter = NULL; + } +} + +static void +gst_metadata_parse_init_members (GstMetadataParse * filter) +{ + filter->need_send_tag = TRUE; + filter->exif = TRUE; + filter->iptc = TRUE; + filter->xmp = TRUE; + filter->adapter = NULL; + filter->next_offset = 0; + filter->next_size = 0; + filter->img_type = IMG_NONE; + filter->state = MT_STATE_NULL; + filter->need_more_data = FALSE; + metadataparse_init (&filter->parse_data); +} + +static gboolean +gst_metadata_parse_configure_srccaps (GstMetadataParse * filter) +{ + GstCaps *caps = NULL; + gboolean ret = FALSE; + gchar *mime = NULL; + + switch (filter->img_type) { + case IMG_JPEG: + mime = "image/jpeg-metadata"; + break; + case IMG_PNG: + mime = "image/png-metadata"; + break; + default: + goto done; + break; + } + + caps = gst_caps_new_simple (mime, NULL); + + ret = gst_pad_set_caps (filter->srcpad, caps); + +done: + + if (caps) { + gst_caps_unref (caps); + caps = NULL; + } + + return ret; + +} + +static gboolean +gst_metadata_parse_configure_caps (GstMetadataParse * filter) +{ + GstCaps *caps = NULL; + gboolean ret = FALSE; + gchar *mime = NULL; + GstPad *peer = NULL; + + peer = gst_pad_get_peer (filter->sinkpad); + + switch (filter->img_type) { + case IMG_JPEG: + mime = "image/jpeg"; + break; + case IMG_PNG: + mime = "image/png"; + break; + default: + goto done; + break; + } + + caps = gst_caps_new_simple (mime, NULL); + + if (!gst_pad_set_caps (peer, caps)) { + goto done; + } + + ret = gst_pad_set_caps (filter->sinkpad, caps); + +done: + + if (caps) { + gst_caps_unref (caps); + caps = NULL; + } + + if (peer) { + gst_object_unref (peer); + peer = NULL; + } + + return ret; + +} + +/* this function handles the link with other elements */ +static gboolean +gst_metadata_parse_set_caps (GstPad * pad, GstCaps * caps) +{ + GstMetadataParse *filter = NULL; + GstStructure *structure = NULL; + const gchar *mime = NULL; + gboolean ret = FALSE; + + filter = GST_METADATA_PARSE (gst_pad_get_parent (pad)); + + structure = gst_caps_get_structure (caps, 0); + + mime = gst_structure_get_name (structure); + + if (strcmp (mime, "image/jpeg") == 0) { + filter->img_type = IMG_JPEG; + } else if (strcmp (mime, "image/png") == 0) { + filter->img_type = IMG_PNG; + } else { + goto done; + } + + ret = gst_metadata_parse_configure_srccaps (filter); + +done: + + gst_object_unref (filter); + + return ret; +} + +static const gchar * +gst_metadata_parse_get_type_name (int img_type) +{ + gchar *type_name = NULL; + + switch (img_type) { + case IMG_JPEG: + type_name = "jpeg"; + break; + case IMG_PNG: + type_name = "png"; + break; + default: + type_name = "invalid type"; + break; + } + return type_name; +} + +/* + * return: + * -1 -> error + * 0 -> succeded + * 1 -> need more data + */ + +static int +gst_metadata_parse_parse (GstMetadataParse * filter, const guint8 * buf, + guint32 size) +{ + + int ret = -1; + + filter->next_offset = 0; + filter->next_size = 0; + + ret = metadataparse_parse (&filter->parse_data, buf, size, + &filter->next_offset, &filter->next_size); + + if (ret < 0) { + if (PARSE_DATA_IMG_TYPE (filter->parse_data) == IMG_NONE) { + /* image type not recognized */ + GST_ELEMENT_ERROR (filter, STREAM, TYPE_NOT_FOUND, (NULL), + ("Only jpeg and png are supported")); + goto done; + } + } else if (ret > 0) { + filter->need_more_data = TRUE; + } else { + filter->state = MT_STATE_PARSED; + filter->need_more_data = FALSE; + } + + if (filter->img_type != PARSE_DATA_IMG_TYPE (filter->parse_data)) { + filter->img_type = PARSE_DATA_IMG_TYPE (filter->parse_data); + if (!gst_metadata_parse_configure_caps (filter)) { + GST_ELEMENT_ERROR (filter, STREAM, FORMAT, (NULL), + ("Couldn't reconfigure caps for %s", + gst_metadata_parse_get_type_name (filter->img_type))); + ret = -1; + goto done; + } + } + +done: + + return ret; + +} + +/* chain function + * this function does the actual processing + */ + +static GstFlowReturn +gst_metadata_parse_chain (GstPad * pad, GstBuffer * buf) +{ + GstMetadataParse *filter = NULL; + GstFlowReturn ret = GST_FLOW_ERROR; + + filter = GST_METADATA_PARSE (gst_pad_get_parent (pad)); + + if (filter->state != MT_STATE_PARSED) { + guint32 adpt_size = gst_adapter_available (filter->adapter); + + if (filter->next_offset) { + if (filter->next_offset >= adpt_size) { + /* clean adapter */ + gst_adapter_clear (filter->adapter); + filter->next_offset -= adpt_size; + if (filter->next_offset >= GST_BUFFER_SIZE (buf)) { + /* we don't need data in this buffer */ + filter->next_offset -= GST_BUFFER_SIZE (buf); + } else { + GstBuffer *new_buf; + + /* add to adapter just need part from buf */ + new_buf = + gst_buffer_new_and_alloc (GST_BUFFER_SIZE (buf) - + filter->next_offset); + memcpy (GST_BUFFER_DATA (new_buf), GST_BUFFER_DATA (buf), + GST_BUFFER_SIZE (buf) - filter->next_offset); + filter->next_offset = 0; + gst_adapter_push (filter->adapter, new_buf); + } + } else { + /* remove first bytes and add buffer */ + gst_adapter_flush (filter->adapter, filter->next_offset); + filter->next_offset = 0; + gst_adapter_push (filter->adapter, gst_buffer_copy (buf)); + } + } else { + /* just push buffer */ + gst_adapter_push (filter->adapter, gst_buffer_copy (buf)); + } + + adpt_size = gst_adapter_available (filter->adapter); + + if (adpt_size && filter->next_size <= adpt_size) { + const guint8 *new_buf = gst_adapter_peek (filter->adapter, adpt_size); + + if (gst_metadata_parse_parse (filter, new_buf, adpt_size) < 0) + goto done; + } + } + + if (filter->need_send_tag) { + metadataparse_exif_dump (filter->parse_data.adpt_exif); + metadataparse_iptc_dump (filter->parse_data.adpt_iptc); + metadataparse_xmp_dump (filter->parse_data.adpt_xmp); + + filter->need_send_tag = FALSE; + } + + gst_buffer_set_caps (buf, GST_PAD_CAPS (filter->srcpad)); + + ret = gst_pad_push (filter->srcpad, buf); + buf = NULL; /* this function don't owner it anymore */ + +done: + + if (buf) { + /* there was an error and buffer wasn't pushed */ + gst_buffer_unref (buf); + buf = NULL; + } + + gst_object_unref (filter); + + return ret; + +} + +static gboolean +gst_metadata_parse_activate (GstPad * pad) +{ + GstMetadataParse *filter = NULL; + gboolean ret = TRUE; + gint64 duration = 0; + GstFormat format = GST_FORMAT_BYTES; + int res; + guint32 offset = 0; + + filter = GST_METADATA_PARSE (gst_pad_get_parent (pad)); + + if (!gst_pad_check_pull_range (pad) || + !gst_pad_activate_pull (filter->sinkpad, TRUE)) { + /* nothing to be done by now, activate push mode */ + goto done; + } + + if (!(ret = + gst_pad_query_peer_duration (filter->sinkpad, &format, &duration))) { + /* this should never happen, but try chain anyway */ + ret = TRUE; + goto done; + } + if (format != GST_FORMAT_BYTES) { + /* this should never happen, but try chain anyway */ + ret = TRUE; + goto done; + } + + /* try to parse */ + do { + GstFlowReturn flow; + GstBuffer *buf = NULL; + + offset += filter->next_offset; + + if (filter->next_size < 4096) { + if (duration - offset < 4096) { + filter->next_size = duration - offset; + } else { + filter->next_size = 4096; + } + } + + flow = + gst_pad_pull_range (filter->sinkpad, offset, filter->next_size, &buf); + if (GST_FLOW_OK != flow) { + ret = FALSE; + goto done; + } + + res = + gst_metadata_parse_parse (filter, GST_BUFFER_DATA (buf), + GST_BUFFER_SIZE (buf)); + if (res < 0) { + ret = FALSE; + goto done; + } + + gst_buffer_unref (buf); + + } while (res > 0); + +done: + + if (ret) { + do { + if (!(ret = gst_pad_activate_pull (filter->sinkpad, FALSE))) + break; + + if (!gst_pad_is_active (filter->sinkpad)) { + ret = gst_pad_activate_push (filter->srcpad, TRUE); + ret &= gst_pad_activate_push (filter->sinkpad, TRUE); + } + + } while (FALSE); + } + + return ret; + +} + +static gboolean +gst_metadata_parse_get_range (GstPad * pad, + guint64 offset, guint size, GstBuffer ** buf) +{ + GstMetadataParse *filter = NULL; + gboolean ret; + + filter = GST_METADATA_PARSE (gst_pad_get_parent (pad)); + + if (filter->need_send_tag) { + metadataparse_exif_dump (filter->parse_data.adpt_exif); + metadataparse_iptc_dump (filter->parse_data.adpt_iptc); + metadataparse_xmp_dump (filter->parse_data.adpt_xmp); + + filter->need_send_tag = FALSE; + } + + ret = gst_pad_pull_range (filter->sinkpad, offset, size, buf); + + gst_object_unref (filter); + + return ret; + +} + +static GstStateChangeReturn +gst_metadata_parse_change_state (GstElement * element, + GstStateChange transition) +{ + GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS; + GstMetadataParse *filter = GST_METADATA_PARSE (element); + + switch (transition) { + case GST_STATE_CHANGE_NULL_TO_READY: + gst_metadata_parse_init_members (filter); + filter->adapter = gst_adapter_new (); + break; + default: + break; + } + + ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); + if (ret == GST_STATE_CHANGE_FAILURE) + goto done; + + switch (transition) { + case GST_STATE_CHANGE_READY_TO_NULL: + gst_metadata_parse_dispose_members (filter); + break; + default: + break; + } + +done: + + return ret; +} + +/* + * element plugin init function + */ + +gboolean +gst_metadata_parse_plugin_init (GstPlugin * plugin) +{ + GST_DEBUG_CATEGORY_INIT (gst_metadata_parse_debug, "metadataparse", 0, + "Metadata demuxer"); + + GST_DEBUG_CATEGORY_INIT (gst_metadata_parse_exif_debug, "metadataparse_exif", + 0, "Metadata exif demuxer"); + GST_DEBUG_CATEGORY_INIT (gst_metadata_parse_iptc_debug, "metadataparse_iptc", + 0, "Metadata iptc demuxer"); + GST_DEBUG_CATEGORY_INIT (gst_metadata_parse_xmp_debug, "metadataparse_xmp", 0, + "Metadata xmp demuxer"); + + + return gst_element_register (plugin, "metadataparse", + GST_RANK_PRIMARY, GST_TYPE_METADATA_PARSE); +} -- cgit v1.2.1