gstreamer/gst/jp2kdecimator/gstjp2kdecimator.c
2014-04-11 12:29:17 +02:00

274 lines
8.3 KiB
C

/* GStreamer
* Copyright (C) 2010 Oblong Industries, Inc.
* Copyright (C) 2010 Collabora Multimedia
*
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-gstjp2kdecimator
*
* The jp2kdecimator element removes information from JPEG2000 images without reencoding.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch -v videotestsrc num-buffers=1 ! jp2kenc ! \
* gstjp2kdecimator max-decomposition-levels=2 ! jp2kdec ! \
* videoconvert ! autovideosink
* ]|
* This pipelines encodes a test image to JPEG2000, only keeps 3 decomposition levels
* decodes the decimated image again and shows it on the screen.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include "gstjp2kdecimator.h"
#include "jp2kcodestream.h"
#include <gst/base/gstbytereader.h>
#include <gst/base/gstbytewriter.h>
#include <string.h>
static GstStaticPadTemplate sink_pad_template =
GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
GST_STATIC_CAPS ("image/x-jpc"));
static GstStaticPadTemplate src_pad_template =
GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
GST_STATIC_CAPS ("image/x-jpc"));
enum
{
PROP_0,
PROP_MAX_LAYERS,
PROP_MAX_DECOMPOSITION_LEVELS
};
#define DEFAULT_MAX_LAYERS (0)
#define DEFAULT_MAX_DECOMPOSITION_LEVELS (-1)
static void gst_jp2k_decimator_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_jp2k_decimator_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static GstFlowReturn gst_jp2k_decimator_sink_chain (GstPad * pad,
GstObject * parent, GstBuffer * inbuf);
GST_DEBUG_CATEGORY (gst_jp2k_decimator_debug);
#define GST_CAT_DEFAULT gst_jp2k_decimator_debug
G_DEFINE_TYPE (GstJP2kDecimator, gst_jp2k_decimator, GST_TYPE_ELEMENT);
static void
gst_jp2k_decimator_class_init (GstJP2kDecimatorClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
gst_element_class_set_static_metadata (gstelement_class,
"JPEG2000 decimator",
"Filter/Image",
"Removes information from JPEG2000 streams without recompression",
"Sebastian Dröge <sebastian.droege@collabora.co.uk>");
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&sink_pad_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&src_pad_template));
gobject_class->set_property = gst_jp2k_decimator_set_property;
gobject_class->get_property = gst_jp2k_decimator_get_property;
g_object_class_install_property (gobject_class, PROP_MAX_LAYERS,
g_param_spec_int ("max-layers", "Maximum Number of Layers",
"Maximum number of layers to keep (0 == all)", 0, 65535,
DEFAULT_MAX_LAYERS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_MAX_DECOMPOSITION_LEVELS,
g_param_spec_int ("max-decomposition-levels",
"Maximum Number of Decomposition Levels",
"Maximum number of decomposition levels to keep (-1 == all)", -1, 32,
DEFAULT_MAX_DECOMPOSITION_LEVELS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
}
static void
gst_jp2k_decimator_init (GstJP2kDecimator * self)
{
self->max_layers = DEFAULT_MAX_LAYERS;
self->max_decomposition_levels = DEFAULT_MAX_DECOMPOSITION_LEVELS;
self->sinkpad = gst_pad_new_from_static_template (&sink_pad_template, "sink");
GST_PAD_SET_PROXY_CAPS (self->sinkpad);
GST_PAD_SET_PROXY_ALLOCATION (self->sinkpad);
gst_pad_set_chain_function (self->sinkpad,
GST_DEBUG_FUNCPTR (gst_jp2k_decimator_sink_chain));
gst_element_add_pad (GST_ELEMENT (self), self->sinkpad);
self->srcpad = gst_pad_new_from_static_template (&src_pad_template, "src");
GST_PAD_SET_PROXY_CAPS (self->srcpad);
gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
}
static void
gst_jp2k_decimator_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstJP2kDecimator *self = GST_JP2K_DECIMATOR (object);
switch (prop_id) {
case PROP_MAX_LAYERS:
self->max_layers = g_value_get_int (value);
break;
case PROP_MAX_DECOMPOSITION_LEVELS:
self->max_decomposition_levels = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_jp2k_decimator_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstJP2kDecimator *self = GST_JP2K_DECIMATOR (object);
switch (prop_id) {
case PROP_MAX_LAYERS:
g_value_set_int (value, self->max_layers);
break;
case PROP_MAX_DECOMPOSITION_LEVELS:
g_value_set_int (value, self->max_decomposition_levels);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstFlowReturn
gst_jp2k_decimator_decimate_jpc (GstJP2kDecimator * self, GstBuffer * inbuf,
GstBuffer ** outbuf_)
{
GstBuffer *outbuf = NULL;
GstFlowReturn ret = GST_FLOW_OK;
GstMapInfo info;
GstByteReader reader;
GstByteWriter writer;
MainHeader main_header;
if (!gst_buffer_map (inbuf, &info, GST_MAP_READ)) {
GST_ELEMENT_ERROR (self, STREAM, WRONG_TYPE, ("Unable to map memory"),
(NULL));
gst_buffer_unref (inbuf);
return GST_FLOW_ERROR;
}
gst_byte_reader_init (&reader, info.data, info.size);
gst_byte_writer_init_with_size (&writer, gst_buffer_get_size (inbuf), FALSE);
/* main header */
memset (&main_header, 0, sizeof (MainHeader));
ret = parse_main_header (self, &reader, &main_header);
if (ret != GST_FLOW_OK)
goto done;
ret = decimate_main_header (self, &main_header);
if (ret != GST_FLOW_OK)
goto done;
ret = write_main_header (self, &writer, &main_header);
if (ret != GST_FLOW_OK)
goto done;
outbuf = gst_byte_writer_reset_and_get_buffer (&writer);
gst_buffer_copy_into (outbuf, inbuf, GST_BUFFER_COPY_METADATA, 0, -1);
GST_DEBUG_OBJECT (self,
"Decimated buffer from %" G_GSIZE_FORMAT " bytes to %" G_GSIZE_FORMAT
" bytes (%.2lf%%)",
gst_buffer_get_size (inbuf), gst_buffer_get_size (outbuf),
(100 * gst_buffer_get_size (outbuf)) /
((gdouble) gst_buffer_get_size (inbuf)));
done:
gst_buffer_unmap (inbuf, &info);
*outbuf_ = outbuf;
reset_main_header (self, &main_header);
gst_buffer_unref (inbuf);
return ret;
}
static GstFlowReturn
gst_jp2k_decimator_sink_chain (GstPad * pad, GstObject * parent,
GstBuffer * inbuf)
{
GstJP2kDecimator *self = GST_JP2K_DECIMATOR (parent);
GstFlowReturn ret;
GstBuffer *outbuf = NULL;
GST_LOG_OBJECT (pad,
"Handling inbuf with timestamp %" GST_TIME_FORMAT " and duration %"
GST_TIME_FORMAT, GST_TIME_ARGS (GST_BUFFER_PTS (inbuf)),
GST_TIME_ARGS (GST_BUFFER_DURATION (inbuf)));
if (self->max_layers == 0 && self->max_decomposition_levels == -1) {
outbuf = inbuf;
inbuf = NULL;
ret = GST_FLOW_OK;
} else {
ret = gst_jp2k_decimator_decimate_jpc (self, inbuf, &outbuf);
}
if (G_UNLIKELY (ret != GST_FLOW_OK))
return ret;
ret = gst_pad_push (self->srcpad, outbuf);
return ret;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (gst_jp2k_decimator_debug, "jp2kdecimator", 0,
"JPEG2000 decimator");
gst_element_register (plugin, "jp2kdecimator", GST_RANK_NONE,
GST_TYPE_JP2K_DECIMATOR);
return TRUE;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
jp2kdecimator,
"JPEG2000 decimator", plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME,
GST_PACKAGE_ORIGIN)