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Hopefully that'll make hotdoc pick up the docs for these elements. Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1428>
274 lines
8.2 KiB
C
274 lines
8.2 KiB
C
/* GStreamer
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* Copyright (C) 2010 Oblong Industries, Inc.
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* Copyright (C) 2010 Collabora Multimedia
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:element-jp2kdecimator
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* @title: gstjp2kdecimator
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*
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* The jp2kdecimator element removes information from JPEG2000 images without reencoding.
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*
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* ## Example launch line
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* |[
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* gst-launch-1.0 -v videotestsrc num-buffers=1 ! jp2kenc ! \
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* gstjp2kdecimator max-decomposition-levels=2 ! jp2kdec ! \
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* videoconvert ! autovideosink
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* ]|
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* This pipelines encodes a test image to JPEG2000, only keeps 3 decomposition levels
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* decodes the decimated image again and shows it on the screen.
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gst/gst.h>
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#include "gstjp2kdecimator.h"
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#include "jp2kcodestream.h"
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#include <gst/base/gstbytereader.h>
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#include <gst/base/gstbytewriter.h>
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#include <string.h>
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static GstStaticPadTemplate sink_pad_template =
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GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("image/x-jpc"));
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static GstStaticPadTemplate src_pad_template =
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GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("image/x-jpc"));
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enum
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{
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PROP_0,
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PROP_MAX_LAYERS,
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PROP_MAX_DECOMPOSITION_LEVELS
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};
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#define DEFAULT_MAX_LAYERS (0)
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#define DEFAULT_MAX_DECOMPOSITION_LEVELS (-1)
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static void gst_jp2k_decimator_set_property (GObject * object,
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guint prop_id, const GValue * value, GParamSpec * pspec);
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static void gst_jp2k_decimator_get_property (GObject * object,
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guint prop_id, GValue * value, GParamSpec * pspec);
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static GstFlowReturn gst_jp2k_decimator_sink_chain (GstPad * pad,
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GstObject * parent, GstBuffer * inbuf);
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GST_DEBUG_CATEGORY (gst_jp2k_decimator_debug);
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#define GST_CAT_DEFAULT gst_jp2k_decimator_debug
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G_DEFINE_TYPE (GstJP2kDecimator, gst_jp2k_decimator, GST_TYPE_ELEMENT);
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static void
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gst_jp2k_decimator_class_init (GstJP2kDecimatorClass * klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
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gst_element_class_set_static_metadata (gstelement_class,
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"JPEG2000 decimator",
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"Filter/Image",
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"Removes information from JPEG2000 streams without recompression",
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"Sebastian Dröge <sebastian.droege@collabora.co.uk>");
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gst_element_class_add_static_pad_template (gstelement_class,
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&sink_pad_template);
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gst_element_class_add_static_pad_template (gstelement_class,
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&src_pad_template);
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gobject_class->set_property = gst_jp2k_decimator_set_property;
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gobject_class->get_property = gst_jp2k_decimator_get_property;
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g_object_class_install_property (gobject_class, PROP_MAX_LAYERS,
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g_param_spec_int ("max-layers", "Maximum Number of Layers",
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"Maximum number of layers to keep (0 == all)", 0, 65535,
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DEFAULT_MAX_LAYERS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_MAX_DECOMPOSITION_LEVELS,
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g_param_spec_int ("max-decomposition-levels",
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"Maximum Number of Decomposition Levels",
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"Maximum number of decomposition levels to keep (-1 == all)", -1, 32,
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DEFAULT_MAX_DECOMPOSITION_LEVELS,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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}
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static void
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gst_jp2k_decimator_init (GstJP2kDecimator * self)
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{
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self->max_layers = DEFAULT_MAX_LAYERS;
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self->max_decomposition_levels = DEFAULT_MAX_DECOMPOSITION_LEVELS;
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self->sinkpad = gst_pad_new_from_static_template (&sink_pad_template, "sink");
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GST_PAD_SET_PROXY_CAPS (self->sinkpad);
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GST_PAD_SET_PROXY_ALLOCATION (self->sinkpad);
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gst_pad_set_chain_function (self->sinkpad,
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GST_DEBUG_FUNCPTR (gst_jp2k_decimator_sink_chain));
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gst_element_add_pad (GST_ELEMENT (self), self->sinkpad);
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self->srcpad = gst_pad_new_from_static_template (&src_pad_template, "src");
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GST_PAD_SET_PROXY_CAPS (self->srcpad);
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gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
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}
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static void
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gst_jp2k_decimator_set_property (GObject * object,
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guint prop_id, const GValue * value, GParamSpec * pspec)
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{
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GstJP2kDecimator *self = GST_JP2K_DECIMATOR (object);
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switch (prop_id) {
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case PROP_MAX_LAYERS:
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self->max_layers = g_value_get_int (value);
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break;
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case PROP_MAX_DECOMPOSITION_LEVELS:
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self->max_decomposition_levels = g_value_get_int (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_jp2k_decimator_get_property (GObject * object,
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guint prop_id, GValue * value, GParamSpec * pspec)
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{
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GstJP2kDecimator *self = GST_JP2K_DECIMATOR (object);
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switch (prop_id) {
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case PROP_MAX_LAYERS:
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g_value_set_int (value, self->max_layers);
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break;
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case PROP_MAX_DECOMPOSITION_LEVELS:
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g_value_set_int (value, self->max_decomposition_levels);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static GstFlowReturn
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gst_jp2k_decimator_decimate_jpc (GstJP2kDecimator * self, GstBuffer * inbuf,
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GstBuffer ** outbuf_)
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{
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GstBuffer *outbuf = NULL;
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GstFlowReturn ret = GST_FLOW_OK;
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GstMapInfo info;
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GstByteReader reader;
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GstByteWriter writer;
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MainHeader main_header;
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if (!gst_buffer_map (inbuf, &info, GST_MAP_READ)) {
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GST_ELEMENT_ERROR (self, STREAM, WRONG_TYPE, ("Unable to map memory"),
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(NULL));
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gst_buffer_unref (inbuf);
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return GST_FLOW_ERROR;
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}
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gst_byte_reader_init (&reader, info.data, info.size);
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gst_byte_writer_init_with_size (&writer, gst_buffer_get_size (inbuf), FALSE);
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/* main header */
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memset (&main_header, 0, sizeof (MainHeader));
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ret = parse_main_header (self, &reader, &main_header);
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if (ret != GST_FLOW_OK)
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goto done;
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ret = decimate_main_header (self, &main_header);
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if (ret != GST_FLOW_OK)
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goto done;
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ret = write_main_header (self, &writer, &main_header);
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if (ret != GST_FLOW_OK)
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goto done;
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outbuf = gst_byte_writer_reset_and_get_buffer (&writer);
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gst_buffer_copy_into (outbuf, inbuf, GST_BUFFER_COPY_METADATA, 0, -1);
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GST_DEBUG_OBJECT (self,
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"Decimated buffer from %" G_GSIZE_FORMAT " bytes to %" G_GSIZE_FORMAT
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" bytes (%.2lf%%)",
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gst_buffer_get_size (inbuf), gst_buffer_get_size (outbuf),
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(100 * gst_buffer_get_size (outbuf)) /
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((gdouble) gst_buffer_get_size (inbuf)));
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done:
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gst_buffer_unmap (inbuf, &info);
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*outbuf_ = outbuf;
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reset_main_header (self, &main_header);
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gst_buffer_unref (inbuf);
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return ret;
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}
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static GstFlowReturn
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gst_jp2k_decimator_sink_chain (GstPad * pad, GstObject * parent,
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GstBuffer * inbuf)
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{
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GstJP2kDecimator *self = GST_JP2K_DECIMATOR (parent);
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GstFlowReturn ret;
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GstBuffer *outbuf = NULL;
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GST_LOG_OBJECT (pad,
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"Handling inbuf with timestamp %" GST_TIME_FORMAT " and duration %"
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GST_TIME_FORMAT, GST_TIME_ARGS (GST_BUFFER_PTS (inbuf)),
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GST_TIME_ARGS (GST_BUFFER_DURATION (inbuf)));
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if (self->max_layers == 0 && self->max_decomposition_levels == -1) {
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outbuf = inbuf;
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inbuf = NULL;
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ret = GST_FLOW_OK;
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} else {
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ret = gst_jp2k_decimator_decimate_jpc (self, inbuf, &outbuf);
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}
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if (G_UNLIKELY (ret != GST_FLOW_OK))
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return ret;
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ret = gst_pad_push (self->srcpad, outbuf);
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return ret;
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}
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static gboolean
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plugin_init (GstPlugin * plugin)
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{
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GST_DEBUG_CATEGORY_INIT (gst_jp2k_decimator_debug, "jp2kdecimator", 0,
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"JPEG2000 decimator");
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gst_element_register (plugin, "jp2kdecimator", GST_RANK_NONE,
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GST_TYPE_JP2K_DECIMATOR);
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return TRUE;
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}
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GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
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GST_VERSION_MINOR,
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jp2kdecimator,
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"JPEG2000 decimator", plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME,
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GST_PACKAGE_ORIGIN)
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