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gstreamer/ext/metadata/gstmetadataparse.c
Edgard Lima 7bc241beb0 Code documentation. 
Original commit message from CVS:
Code documentation.
2007-12-13 17:19:54 +00:00

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/*
* 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:metadataparse-metadata
*
* <refsect2>
* <title>Example launch line</title>
* <para>
* <programlisting>
* gst-launch -v -m filesrc location=./test.jpeg ! metadataparse ! fakesink silent=TRUE
* </programlisting>
* </para>
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <gst/gst.h>
#include "gstmetadataparse.h"
#include "metadataexif.h"
#include "metadataiptc.h"
#include "metadataxmp.h"
#include <string.h>
GST_DEBUG_CATEGORY_STATIC (gst_metadata_parse_debug);
#define GST_CAT_DEFAULT gst_metadata_parse_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, "
"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")
);
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_checkgetrange (GstPad * srcpad);
static GstFlowReturn
gst_metadata_parse_get_range (GstPad * pad, guint64 offset_orig, guint size,
GstBuffer ** buf);
static gboolean gst_metadata_parse_sink_activate (GstPad * pad);
static gboolean
gst_metadata_parse_src_activate_pull (GstPad * pad, gboolean active);
static gboolean gst_metadata_parse_pull_range_parse (GstMetadataParse * filter);
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_send_tags (GstMetadataParse * filter);
static int
gst_metadata_parse_get_strip_seg (const gint64 offset, guint32 size,
const gint64 seg_offset, const guint32 seg_size,
gint64 * boffset, guint32 * bsize, guint32 * seg_binter);
static gboolean
gst_metadata_parse_strip_push_buffer (GstMetadataParse * filter,
gint64 offset_orig, GstBuffer ** prepend, GstBuffer ** buf);
static gboolean
gst_metadata_parse_translate_pos_to_orig (GstMetadataParse * filter, gint64 pos,
gint64 * orig_pos, GstBuffer ** buf);
static const GstQueryType *gst_metadata_parse_get_query_types (GstPad * pad);
static gboolean gst_metadata_parse_src_query (GstPad * pad, GstQuery * query);
static void
gst_metadata_parse_base_init (gpointer gclass)
{
static GstElementDetails element_details = {
"Metadata parser",
"Parser/Extracter/Metadata",
"Send metadata tags (EXIF, IPTC and XMP) while passing throught the contents",
"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_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_sink_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_set_query_function (filter->srcpad,
GST_DEBUG_FUNCPTR (gst_metadata_parse_src_query));
gst_pad_set_query_type_function (filter->srcpad,
GST_DEBUG_FUNCPTR (gst_metadata_parse_get_query_types));
gst_pad_use_fixed_caps (filter->srcpad);
gst_pad_set_checkgetrange_function (filter->srcpad,
GST_DEBUG_FUNCPTR (gst_metadata_parse_checkgetrange));
gst_pad_set_getrange_function (filter->srcpad, gst_metadata_parse_get_range);
gst_pad_set_activatepull_function (filter->srcpad,
GST_DEBUG_FUNCPTR (gst_metadata_parse_src_activate_pull));
/* addind pads */
gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);
gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
metadataparse_xmp_init ();
/* init members */
filter->options = META_OPT_EXIF | META_OPT_IPTC | META_OPT_XMP;
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))
filter->options |= META_OPT_EXIF;
else
filter->options &= ~META_OPT_EXIF;
break;
case ARG_IPTC:
if (g_value_get_boolean (value))
filter->options |= META_OPT_IPTC;
else
filter->options &= ~META_OPT_IPTC;
break;
case ARG_XMP:
if (g_value_get_boolean (value))
filter->options |= META_OPT_XMP;
else
filter->options &= ~META_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, filter->options & META_OPT_EXIF);
break;
case ARG_IPTC:
g_value_set_boolean (value, filter->options & META_OPT_IPTC);
break;
case ARG_XMP:
g_value_set_boolean (value, filter->options & META_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;
const gchar *mime = NULL;
structure = gst_caps_get_structure (caps_otherpad_peer, i);
mime = gst_structure_get_name (structure);
if (pad == filter->sinkpad) {
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_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:
{
gdouble rate;
GstFormat format;
GstSeekFlags flags;
GstSeekType start_type;
gint64 start;
GstSeekType stop_type;
gint64 stop;
/* we don't know where are the chunks to be stripped before parse */
if (filter->state != MT_STATE_PARSED)
goto done;
gst_event_parse_seek (event, &rate, &format, &flags,
&start_type, &start, &stop_type, &stop);
switch (format) {
case GST_FORMAT_BYTES:
break;
case GST_FORMAT_PERCENT:
if (filter->duration < 0)
goto done;
start = start * filter->duration / 100;
stop = stop * filter->duration / 100;
break;
default:
goto done;
}
format = GST_FORMAT_BYTES;
if (start_type == GST_SEEK_TYPE_CUR)
start = filter->offset + start;
else if (start_type == GST_SEEK_TYPE_END) {
if (filter->duration < 0)
goto done;
start = filter->duration + start;
}
start_type == GST_SEEK_TYPE_SET;
if (filter->prepend_buffer) {
gst_buffer_unref (filter->prepend_buffer);
filter->prepend_buffer = NULL;
}
/* FIXME: related to append */
filter->offset = start;
gst_metadata_parse_translate_pos_to_orig (filter, start, &start,
&filter->prepend_buffer);
filter->offset_orig = start;
if (stop_type == GST_SEEK_TYPE_CUR)
stop = filter->offset + stop;
else if (stop_type == GST_SEEK_TYPE_END) {
if (filter->duration < 0)
goto done;
stop = filter->duration + stop;
}
stop_type == GST_SEEK_TYPE_SET;
gst_metadata_parse_translate_pos_to_orig (filter, stop, &stop, NULL);
gst_event_unref (event);
event = gst_event_new_seek (rate, format, flags,
start_type, start, stop_type, stop);
}
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);
metadataparse_xmp_dispose ();
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)
{
metadata_dispose (&filter->parse_data);
if (filter->adapter_parsing) {
gst_object_unref (filter->adapter_parsing);
filter->adapter_parsing = NULL;
}
if (filter->adapter_holding) {
gst_object_unref (filter->adapter_holding);
filter->adapter_holding = NULL;
}
if (filter->append_buffer) {
gst_buffer_unref (filter->append_buffer);
filter->append_buffer = NULL;
}
if (filter->prepend_buffer) {
gst_buffer_unref (filter->prepend_buffer);
filter->prepend_buffer = NULL;
}
}
static void
gst_metadata_parse_init_members (GstMetadataParse * filter)
{
filter->need_send_tag = FALSE;
filter->adapter_parsing = NULL;
filter->adapter_holding = NULL;
filter->next_offset = 0;
filter->next_size = 0;
filter->img_type = IMG_NONE;
filter->offset_orig = 0;
filter->duration_orig = 0;
filter->offset = 0;
filter->duration = 0;
filter->state = MT_STATE_NULL;
filter->need_more_data = FALSE;
filter->append_buffer = NULL;
filter->prepend_buffer = NULL;
memset (&filter->parse_data, 0x00, sizeof (MetaData));
}
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";
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 (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;
gboolean parsed = TRUE;
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 {
ret = FALSE;
goto done;
}
if (gst_structure_get_boolean (structure, "tags-extracted", &parsed)) {
if (parsed == TRUE) {
ret = FALSE;
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;
}
static void
gst_metadata_parse_send_tags (GstMetadataParse * filter)
{
GstMessage *msg;
GstTagList *taglist = gst_tag_list_new ();
GstEvent *event;
if (filter->options & META_OPT_EXIF)
metadataparse_exif_tag_list_add (taglist, GST_TAG_MERGE_KEEP,
filter->parse_data.exif_adapter, METADATA_TAG_MAP_WHOLECHUNK);
if (filter->options & META_OPT_IPTC)
metadataparse_iptc_tag_list_add (taglist, GST_TAG_MERGE_KEEP,
filter->parse_data.iptc_adapter, METADATA_TAG_MAP_WHOLECHUNK);
if (filter->options & META_OPT_XMP)
metadataparse_xmp_tag_list_add (taglist, GST_TAG_MERGE_KEEP,
filter->parse_data.xmp_adapter, 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 (filter->srcpad, event);
taglist = NULL;
}
if (!taglist)
taglist = gst_tag_list_new ();
if (filter->options & META_OPT_EXIF)
metadataparse_exif_tag_list_add (taglist, GST_TAG_MERGE_KEEP,
filter->parse_data.exif_adapter, METADATA_TAG_MAP_INDIVIDUALS);
if (filter->options & META_OPT_IPTC)
metadataparse_iptc_tag_list_add (taglist, GST_TAG_MERGE_KEEP,
filter->parse_data.iptc_adapter, METADATA_TAG_MAP_INDIVIDUALS);
if (filter->options & META_OPT_XMP)
metadataparse_xmp_tag_list_add (taglist, GST_TAG_MERGE_KEEP,
filter->parse_data.xmp_adapter, 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);
filter->need_send_tag = FALSE;
}
static const GstQueryType *
gst_metadata_parse_get_query_types (GstPad * pad)
{
static const GstQueryType gst_metadata_parse_src_query_types[] = {
GST_QUERY_POSITION,
GST_QUERY_DURATION,
GST_QUERY_FORMATS,
0
};
return gst_metadata_parse_src_query_types;
}
static gboolean
gst_metadata_parse_src_query (GstPad * pad, GstQuery * query)
{
gboolean ret = FALSE;
GstFormat format;
GstMetadataParse *filter = GST_METADATA_PARSE (gst_pad_get_parent (pad));
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_POSITION:
gst_query_parse_position (query, &format, NULL);
if (format == GST_FORMAT_BYTES) {
gst_query_set_position (query, GST_FORMAT_BYTES, filter->offset);
ret = TRUE;
}
break;
case GST_QUERY_DURATION:
if (filter->state != MT_STATE_PARSED)
goto done;
gst_query_parse_duration (query, &format, NULL);
if (format == GST_FORMAT_BYTES) {
if (filter->duration >= 0) {
gst_query_set_duration (query, GST_FORMAT_BYTES, filter->duration);
ret = TRUE;
}
}
break;
case GST_QUERY_FORMATS:
gst_query_set_formats (query, 1, GST_FORMAT_BYTES);
ret = TRUE;
break;
default:
break;
}
done:
gst_object_unref (filter);
return ret;
}
static void
gst_metadata_parse_calculate_offsets (GstMetadataParse * filter)
{
int i, j;
guint32 append_size;
guint32 bytes_striped, bytes_inject;
MetadataChunk *strip = filter->parse_data.strip_chunks.chunk;
MetadataChunk *inject = filter->parse_data.inject_chunks.chunk;
const gsize strip_len = filter->parse_data.strip_chunks.len;
const gsize inject_len = filter->parse_data.inject_chunks.len;
bytes_striped = 0;
bytes_inject = 0;
/* calculate the new position off injected chunks */
j = 0;
for (i = 0; i < inject_len; ++i) {
for (; j < strip_len; ++j) {
if (strip[j].offset_orig >= inject[i].offset_orig) {
break;
}
bytes_striped += strip[j].size;
}
inject[i].offset = inject[i].offset_orig - bytes_striped + bytes_inject;
bytes_inject += inject[i].size;
}
/* calculate append (doesnt make much sense, but, anyway..) */
append_size = 0;
for (i = inject_len - 1; i >= 0; --i) {
if (inject[i].offset_orig == filter->duration_orig)
append_size += inject[i].size;
else
break;
}
if (append_size) {
guint8 *data;
filter->append_buffer = gst_buffer_new_and_alloc (append_size);
GST_BUFFER_FLAG_SET (filter->append_buffer, GST_BUFFER_FLAG_READONLY);
data = GST_BUFFER_DATA (filter->append_buffer);
for (i = inject_len - 1; i >= 0; --i) {
if (inject[i].offset_orig == filter->duration_orig) {
memcpy (data, inject[i].data, inject[i].size);
data += inject[i].size;
} else {
break;
}
}
}
/* do nothing but just call for consistence */
metadata_lazy_update (&filter->parse_data);
if (filter->duration_orig) {
filter->duration = filter->duration_orig;
for (i = 0; i < inject_len; ++i) {
filter->duration += inject[i].size;
}
for (i = 0; i < strip_len; ++i) {
filter->duration -= strip[i].size;
}
}
}
/*
* Do parsing step-by-step and reconfigure caps if need
* return:
* META_PARSING_ERROR
* META_PARSING_DONE
* META_PARSING_NEED_MORE_DATA
*/
static int
gst_metadata_parse_parse (GstMetadataParse * filter, const guint8 * buf,
guint32 size)
{
int ret = META_PARSING_ERROR;
filter->next_offset = 0;
filter->next_size = 0;
ret = metadata_parse (&filter->parse_data, buf, size,
&filter->next_offset, &filter->next_size);
if (ret == META_PARSING_ERROR) {
if (META_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 == META_PARSING_NEED_MORE_DATA) {
filter->need_more_data = TRUE;
} else {
gst_metadata_parse_calculate_offsets (filter);
filter->state = MT_STATE_PARSED;
filter->need_more_data = FALSE;
filter->need_send_tag = TRUE;
}
/* reconfigure caps if it is different from type detected by 'metadata_parse' function */
if (filter->img_type != META_DATA_IMG_TYPE (filter->parse_data)) {
filter->img_type = META_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 = META_PARSING_ERROR;
goto done;
}
}
done:
return ret;
}
/* chain function
* this function does the actual processing
*/
/* FIXME */
/* Current parse is just done before is pull mode could be activated */
/* may be it is possible to parse in chain mode by doing some trick with gst-adapter */
/* the pipeline below would be a test for that case */
/* gst-launch-0.10 filesrc location=Exif.jpg ! queue ! metadataparse ! filesink location=gen3.jpg */
static GstFlowReturn
gst_metadata_parse_chain (GstPad * pad, GstBuffer * buf)
{
GstMetadataParse *filter = NULL;
GstFlowReturn ret = GST_FLOW_ERROR;
guint32 buf_size = 0;
guint32 new_buf_size = 0;
gboolean append = FALSE;
filter = GST_METADATA_PARSE (gst_pad_get_parent (pad));
if (filter->state != MT_STATE_PARSED) {
guint32 adpt_size = gst_adapter_available (filter->adapter_parsing);
if (filter->next_offset) {
if (filter->next_offset >= adpt_size) {
/* clean adapter */
gst_adapter_clear (filter->adapter_parsing);
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) + filter->next_offset,
GST_BUFFER_SIZE (buf) - filter->next_offset);
filter->next_offset = 0;
gst_adapter_push (filter->adapter_parsing, new_buf);
}
} else {
/* remove first bytes and add buffer */
gst_adapter_flush (filter->adapter_parsing, filter->next_offset);
filter->next_offset = 0;
gst_adapter_push (filter->adapter_parsing, gst_buffer_copy (buf));
}
} else {
/* just push buffer */
gst_adapter_push (filter->adapter_parsing, gst_buffer_copy (buf));
}
adpt_size = gst_adapter_available (filter->adapter_parsing);
if (adpt_size && filter->next_size <= adpt_size) {
const guint8 *new_buf =
gst_adapter_peek (filter->adapter_parsing, adpt_size);
if (gst_metadata_parse_parse (filter, new_buf,
adpt_size) == META_PARSING_ERROR) {
ret = GST_FLOW_ERROR;
goto done;
}
}
}
if (filter->state == MT_STATE_PARSED) {
if (filter->adapter_holding) {
gst_adapter_push (filter->adapter_holding, buf);
buf = gst_adapter_take_buffer (filter->adapter_holding,
gst_adapter_available (filter->adapter_holding));
g_object_unref (filter->adapter_holding);
filter->adapter_holding = NULL;
}
if (filter->need_send_tag) {
gst_metadata_parse_send_tags (filter);
}
if (filter->offset_orig + GST_BUFFER_SIZE (buf) == filter->duration_orig)
append = TRUE;
buf_size = GST_BUFFER_SIZE (buf);
gst_metadata_parse_strip_push_buffer (filter, filter->offset_orig,
&filter->prepend_buffer, &buf);
if (buf) { /* may be all buffer has been striped */
gst_buffer_set_caps (buf, GST_PAD_CAPS (filter->srcpad));
new_buf_size = GST_BUFFER_SIZE (buf);
ret = gst_pad_push (filter->srcpad, buf);
buf = NULL; /* this function don't owner it anymore */
if (ret != GST_FLOW_OK)
goto done;
} else {
ret = GST_FLOW_OK;
}
if (append && filter->append_buffer) {
gst_buffer_set_caps (filter->append_buffer,
GST_PAD_CAPS (filter->srcpad));
gst_buffer_ref (filter->append_buffer);
ret = gst_pad_push (filter->srcpad, filter->append_buffer);
if (ret != GST_FLOW_OK)
goto done;
}
filter->offset_orig += buf_size;
filter->offset += new_buf_size;
} else {
/* just store while still not parsed */
if (!filter->adapter_holding)
filter->adapter_holding = gst_adapter_new ();
gst_adapter_push (filter->adapter_holding, buf);
buf = NULL;
ret = GST_FLOW_OK;
}
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_pull_range_parse (GstMetadataParse * filter)
{
int res;
gboolean ret = TRUE;
guint32 offset = 0;
gint64 duration = 0;
GstFormat format = GST_FORMAT_BYTES;
if (!(ret =
gst_pad_query_peer_duration (filter->sinkpad, &format, &duration))) {
/* this should never happen, but try chain anyway */
ret = TRUE;
goto done;
}
filter->duration_orig = duration;
if (format != GST_FORMAT_BYTES) {
/* this should never happen, but try chain anyway */
ret = TRUE;
goto done;
}
do {
GstFlowReturn flow;
GstBuffer *buf = NULL;
offset += filter->next_offset;
/* 'filter->next_size' only says the minimum required number of bytes.
We try provided more bytes (4096) just to avoid a lot of calls to 'metadata_parse'
returning META_PARSING_NEED_MORE_DATA */
if (filter->next_size < 4096) {
if (duration - offset < 4096) {
/* In case there is no 4096 bytes available upstream.
It should be done upstream but we do here for safety */
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 == META_PARSING_ERROR) {
ret = FALSE;
goto done;
}
gst_buffer_unref (buf);
} while (res == META_PARSING_NEED_MORE_DATA);
done:
return ret;
}
static gboolean
gst_metadata_parse_sink_activate (GstPad * pad)
{
GstMetadataParse *filter = NULL;
gboolean ret = TRUE;
filter = GST_METADATA_PARSE (GST_PAD_PARENT (pad));
if (!gst_pad_check_pull_range (pad) ||
!gst_pad_activate_pull (filter->sinkpad, TRUE)) {
/* FIXME: currently it is not possible to parse in chain. Fail here ? */
/* nothing to be done by now, activate push mode */
return gst_pad_activate_push (pad, TRUE);
}
/* try to parse */
if (filter->state == MT_STATE_NULL) {
ret = gst_metadata_parse_pull_range_parse (filter);
}
done:
if (ret) {
gst_pad_activate_pull (pad, FALSE);
gst_pad_activate_push (filter->srcpad, FALSE);
if (!gst_pad_is_active (pad)) {
ret = gst_pad_activate_push (filter->srcpad, TRUE);
ret = ret && gst_pad_activate_push (pad, TRUE);
}
}
return ret;
}
/*
* offset - offset of buffer in original stream
* size - size of buffer
* seg_offset - offset of segment in original stream
* seg_size - size of segment
* boffset - offset inside buffer where segment starts (-1 for no intersection)
* bsize - size of intersection
* seg_binter - if segment start inside buffer is zero. if segment start before
* buffer and intersect, it is the offset inside segment.
*
* ret:
* -1 - segment before buffer
* 0 - segment intersects
* 1 - segment after buffer
*/
static int
gst_metadata_parse_get_strip_seg (const gint64 offset, guint32 size,
const gint64 seg_offset, const guint32 seg_size,
gint64 * boffset, guint32 * bsize, guint32 * seg_binter)
{
int ret = -1;
*boffset = -1;
*bsize = 0;
*seg_binter = -1;
/* all segment after buffer */
if (seg_offset >= offset + size) {
ret = 1;
goto done;
}
if (seg_offset < offset) {
/* segment start somewhere before buffer */
/* all segment before buffer */
if (seg_offset + seg_size <= offset) {
ret = -1;
goto done;
}
*seg_binter = offset - seg_offset;
*boffset = 0;
/* FIXME : optimize to >= size -> = size */
if (seg_offset + seg_size >= offset + size) {
/* segment cover all buffer */
*bsize = size;
} else {
/* segment goes from start of buffer to somewhere before end */
*bsize = seg_size - *seg_binter;
}
ret = 0;
} else {
/* segment start somewhere into buffer */
*boffset = seg_offset - offset;
*seg_binter = 0;
if (seg_offset + seg_size <= offset + size) {
/* all segment into buffer */
*bsize = seg_size;
} else {
*bsize = size - *boffset;
}
ret = 0;
}
done:
return ret;
}
/*
* TRUE -> buffer striped or injeted
* FALSE -> buffer unmodified
*/
static gboolean
gst_metadata_parse_strip_push_buffer (GstMetadataParse * filter,
gint64 offset_orig, GstBuffer ** prepend, GstBuffer ** buf)
{
MetadataChunk *strip = filter->parse_data.strip_chunks.chunk;
MetadataChunk *inject = filter->parse_data.inject_chunks.chunk;
const gsize strip_len = filter->parse_data.strip_chunks.len;
const gsize inject_len = filter->parse_data.inject_chunks.len;
gboolean buffer_reallocated = FALSE;
guint32 size_buf_in = GST_BUFFER_SIZE (*buf);
gint64 *boffset_strip = NULL;
guint32 *bsize_strip = NULL;
guint32 *seg_binter_strip = NULL;
int i, j;
gboolean need_free_strip = FALSE;
guint32 striped_bytes = 0;
guint32 injected_bytes = 0;
guint32 prepend_size = prepend && *prepend ? GST_BUFFER_SIZE (*prepend) : 0;
if (inject_len) {
for (i = 0; i < inject_len; ++i) {
int res;
if (inject[i].offset_orig >= offset_orig) {
if (inject[i].offset_orig < offset_orig + size_buf_in) {
injected_bytes += inject[i].size;
} else {
/* segment is after size (segments are sorted) */
break;
}
}
}
}
/*
* strip segments
*/
if (strip_len == 0)
goto inject;
if (G_UNLIKELY (strip_len > 16)) {
boffset_strip = g_new (gint64, strip_len);
bsize_strip = g_new (guint32, strip_len);
seg_binter_strip = g_new (guint32, strip_len);
need_free_strip = TRUE;
} else {
boffset_strip = g_alloca (sizeof (boffset_strip[0]) * strip_len);
bsize_strip = g_alloca (sizeof (bsize_strip[0]) * strip_len);
seg_binter_strip = g_alloca (sizeof (seg_binter_strip[0]) * strip_len);
}
memset (bsize_strip, 0x00, sizeof (bsize_strip[0]) * strip_len);
for (i = 0; i < strip_len; ++i) {
int res;
res = gst_metadata_parse_get_strip_seg (offset_orig, size_buf_in,
strip[i].offset_orig, strip[i].size, &boffset_strip[i], &bsize_strip[i],
&seg_binter_strip[i]);
/* segment is after size (segments are sorted) */
striped_bytes += bsize_strip[i];
if (res > 0) {
break;
}
}
if (striped_bytes) {
guint8 *data;
if (!buffer_reallocated) {
buffer_reallocated = TRUE;
if (injected_bytes + prepend_size > striped_bytes) {
GstBuffer *new_buf =
gst_buffer_new_and_alloc (GST_BUFFER_SIZE (*buf) + injected_bytes +
prepend_size - striped_bytes);
memcpy (GST_BUFFER_DATA (new_buf), GST_BUFFER_DATA (*buf),
GST_BUFFER_SIZE (*buf));
gst_buffer_unref (*buf);
*buf = new_buf;
} else if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_READONLY)) {
GstBuffer *new_buf = gst_buffer_copy (*buf);
gst_buffer_unref (*buf);
*buf = new_buf;
GST_BUFFER_FLAG_UNSET (*buf, GST_BUFFER_FLAG_READONLY);
GST_BUFFER_SIZE (*buf) += injected_bytes + prepend_size - striped_bytes;
}
}
data = GST_BUFFER_DATA (*buf);
striped_bytes = 0;
for (i = 0; i < strip_len; ++i) {
/* intersect */
if (bsize_strip[i]) {
memmove (data + boffset_strip[i] - striped_bytes,
data + boffset_strip[i] + bsize_strip[i] - striped_bytes,
size_buf_in - boffset_strip[i] - bsize_strip[i]);
striped_bytes += bsize_strip[i];
}
}
size_buf_in -= striped_bytes;
}
inject:
/*
* inject segments
*/
if (inject_len) {
guint8 *data;
guint32 striped_so_far;
if (!buffer_reallocated) {
buffer_reallocated = TRUE;
if (injected_bytes + prepend_size > striped_bytes) {
GstBuffer *new_buf =
gst_buffer_new_and_alloc (GST_BUFFER_SIZE (*buf) + injected_bytes +
prepend_size - striped_bytes);
memcpy (GST_BUFFER_DATA (new_buf), GST_BUFFER_DATA (*buf),
GST_BUFFER_SIZE (*buf));
gst_buffer_unref (*buf);
*buf = new_buf;
} else if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_READONLY)) {
GstBuffer *new_buf = gst_buffer_copy (*buf);
gst_buffer_unref (*buf);
*buf = new_buf;
GST_BUFFER_FLAG_UNSET (*buf, GST_BUFFER_FLAG_READONLY);
GST_BUFFER_SIZE (*buf) += injected_bytes + prepend_size - striped_bytes;
}
}
data = GST_BUFFER_DATA (*buf);
injected_bytes = 0;
striped_so_far = 0;
j = 0;
for (i = 0; i < inject_len; ++i) {
int res;
while (j < strip_len) {
if (strip[j].offset_orig < inject[i].offset_orig)
striped_so_far += bsize_strip[j++];
else
break;
}
if (inject[i].offset_orig >= offset_orig) {
if (inject[i].offset_orig <
offset_orig + size_buf_in + striped_bytes - injected_bytes) {
/* insert */
guint32 buf_off =
inject[i].offset_orig - offset_orig - striped_so_far +
injected_bytes;
memmove (data + buf_off + inject[i].size, data + buf_off,
size_buf_in - buf_off);
memcpy (data + buf_off, inject[i].data, inject[i].size);
injected_bytes += inject[i].size;
size_buf_in += inject[i].size;
} else {
/* segment is after size (segments are sorted) */
break;
}
}
}
}
done:
if (prepend_size) {
if (injected_bytes == 0 && striped_bytes == 0) {
GstBuffer *new_buf =
gst_buffer_new_and_alloc (size_buf_in + prepend_size);
memcpy (GST_BUFFER_DATA (new_buf) + prepend_size, GST_BUFFER_DATA (*buf),
size_buf_in);
gst_buffer_unref (*buf);
*buf = new_buf;
} else {
memmove (GST_BUFFER_DATA (*buf) + prepend_size, GST_BUFFER_DATA (*buf),
size_buf_in);
}
memcpy (GST_BUFFER_DATA (*buf), GST_BUFFER_DATA (*prepend), prepend_size);
gst_buffer_unref (*prepend);
*prepend = NULL;
}
GST_BUFFER_SIZE (*buf) = size_buf_in + prepend_size;
if (need_free_strip) {
g_free (boffset_strip);
g_free (bsize_strip);
g_free (seg_binter_strip);
}
return injected_bytes || striped_bytes;
}
/*
* pos - position in stream striped
* orig_pos - position in original stream
* return TRUE - position in original buffer
* FALSE - position in inserted chunk
*/
static gboolean
gst_metadata_parse_translate_pos_to_orig (GstMetadataParse * filter, gint64 pos,
gint64 * orig_pos, GstBuffer ** buf)
{
int i;
MetadataChunk *strip = filter->parse_data.strip_chunks.chunk;
MetadataChunk *inject = filter->parse_data.inject_chunks.chunk;
const gsize strip_len = filter->parse_data.strip_chunks.len;
const gsize inject_len = filter->parse_data.inject_chunks.len;
gboolean ret = TRUE;
guint64 new_buf_size = 0;
guint64 injected_before = 0;
if (G_UNLIKELY (pos == -1)) {
*orig_pos = -1;
return TRUE;
} else if (G_UNLIKELY (pos >= filter->duration)) {
/* this should never happen */
*orig_pos = filter->duration_orig;
return TRUE;
}
/* calculate for injected */
/* just calculate size */
*orig_pos = pos; /* save pos */
for (i = 0; i < inject_len; ++i) {
/* check if pos in inside chunk */
if (inject[i].offset <= pos) {
if (pos < inject[i].offset + inject[i].size) {
/* orig pos points after insert chunk */
new_buf_size += inject[i].size;
/* put pos after current chunk */
pos = inject[i].offset + inject[i].size;
ret = FALSE;
} else {
/* in case pos is not inside a injected chunk */
injected_before += inject[i].size;
}
} else {
break;
}
}
/* alloc buffer and calcute original pos */
if (buf && ret == FALSE) {
guint8 *data;
if (*buf)
gst_buffer_unref (*buf);
*buf = gst_buffer_new_and_alloc (new_buf_size);
data = GST_BUFFER_DATA (*buf);
pos = *orig_pos; /* recover saved pos */
for (i = 0; i < inject_len; ++i) {
if (inject[i].offset > pos) {
break;
}
if (inject[i].offset <= pos && pos < inject[i].offset + inject[i].size) {
memcpy (data, inject[i].data, inject[i].size);
data += inject[i].size;
pos = inject[i].offset + inject[i].size;
/* out position after insert chunk orig */
*orig_pos = inject[i].offset_orig + inject[i].size;
}
}
}
if (ret == FALSE) {
/* if it inside a injected is already done */
goto done;
}
/* calculate for striped */
*orig_pos = pos - injected_before;
for (i = 0; i < strip_len; ++i) {
if (strip[i].offset_orig > pos) {
break;
}
*orig_pos += strip[i].size;
}
done:
if (G_UNLIKELY (*orig_pos >= filter->duration_orig)) {
*orig_pos = filter->duration_orig - 1;
}
return ret;
}
static gboolean
gst_metadata_parse_checkgetrange (GstPad * srcpad)
{
GstMetadataParse *filter = NULL;
filter = GST_METADATA_PARSE (GST_PAD_PARENT (srcpad));
return gst_pad_check_pull_range (filter->sinkpad);
}
static GstFlowReturn
gst_metadata_parse_get_range (GstPad * pad,
guint64 offset, guint size, GstBuffer ** buf)
{
GstMetadataParse *filter = NULL;
GstFlowReturn ret = GST_FLOW_OK;
gint64 offset_orig = 0;
guint size_orig;
GstBuffer *prepend = NULL;
gboolean need_append = FALSE;
filter = GST_METADATA_PARSE (GST_PAD_PARENT (pad));
if (filter->state != MT_STATE_PARSED) {
ret = GST_FLOW_ERROR;
goto done;
}
if (offset + size > filter->duration) {
size = filter->duration - offset;
}
size_orig = size;
if (filter->need_send_tag) {
gst_metadata_parse_send_tags (filter);
}
gst_metadata_parse_translate_pos_to_orig (filter, offset, &offset_orig,
&prepend);
if (size > 1) {
gint64 pos;
pos = offset + size - 1;
gst_metadata_parse_translate_pos_to_orig (filter, pos, &pos, NULL);
size_orig = pos + 1 - offset_orig;
}
if (size_orig) {
ret = gst_pad_pull_range (filter->sinkpad, offset_orig, size_orig, buf);
if (ret == GST_FLOW_OK && *buf) {
gst_metadata_parse_strip_push_buffer (filter, offset_orig, &prepend, buf);
if (GST_BUFFER_SIZE (*buf) < size) {
/* need append */
need_append = TRUE;
}
}
} else {
*buf = prepend;
}
done:
if (need_append) {
/* FIXME: together with SEEK and
* gst_metadata_parse_translate_pos_to_orig
* this way if chunk is added in the end we are in trolble
* ...still not implemented 'cause it will not be the
* case for the time being
*/
}
return ret;
}
static gboolean
gst_metadata_parse_src_activate_pull (GstPad * pad, gboolean active)
{
GstMetadataParse *filter = NULL;
gboolean ret;
filter = GST_METADATA_PARSE (gst_pad_get_parent (pad));
ret = gst_pad_activate_pull (filter->sinkpad, active);
if (ret && filter->state == MT_STATE_NULL) {
ret = gst_metadata_parse_pull_range_parse (filter);
}
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_parsing = gst_adapter_new ();
metadata_init (&filter->parse_data, TRUE, filter->options);
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_PAUSED_TO_READY:
filter->offset = 0;
filter->offset_orig = 0;
if (filter->adapter_parsing) {
gst_adapter_clear (filter->adapter_parsing);
}
if (filter->adapter_holding) {
gst_adapter_clear (filter->adapter_holding);
}
if (filter->state != MT_STATE_PARSED) {
/* cleanup parser */
/* FIXME: could be improved a bit to avoid mem allocation */
metadata_dispose (&filter->parse_data);
metadata_init (&filter->parse_data, TRUE, filter->options);
}
break;
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");
return gst_element_register (plugin, "metadataparse",
GST_RANK_PRIMARY + 1, GST_TYPE_METADATA_PARSE);
}
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