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270 lines
7.9 KiB
C
270 lines
7.9 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:element-alphacolor
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*
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* The alphacolor element does memory-efficient (in-place) colourspace
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* conversion from RGBA to AYUV, preserving the alpha channel.
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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 "gstalphacolor.h"
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#include <gst/gst.h>
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#include <gst/video/video.h>
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#include <string.h>
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GST_DEBUG_CATEGORY_STATIC (alpha_color_debug);
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#define GST_CAT_DEFAULT alpha_color_debug
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/* elementfactory information */
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static const GstElementDetails gst_alpha_color_details =
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GST_ELEMENT_DETAILS ("Alpha color filter",
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"Filter/Effect/Video",
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"RGBA to AYUV colorspace conversion preserving the alpha channel",
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"Wim Taymans <wim@fluendo.com>");
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static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_VIDEO_CAPS_RGBA ";" GST_VIDEO_CAPS_BGRA)
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);
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static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("AYUV"))
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);
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GST_BOILERPLATE (GstAlphaColor, gst_alpha_color, GstBaseTransform,
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GST_TYPE_BASE_TRANSFORM);
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static GstCaps *gst_alpha_color_transform_caps (GstBaseTransform * btrans,
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GstPadDirection direction, GstCaps * caps);
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static gboolean gst_alpha_color_set_caps (GstBaseTransform * btrans,
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GstCaps * incaps, GstCaps * outcaps);
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static GstFlowReturn gst_alpha_color_transform_ip (GstBaseTransform * btrans,
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GstBuffer * inbuf);
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static void
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gst_alpha_color_base_init (gpointer g_class)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
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gst_element_class_set_details (element_class, &gst_alpha_color_details);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&sink_template));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&src_template));
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}
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static void
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gst_alpha_color_class_init (GstAlphaColorClass * klass)
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{
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GstBaseTransformClass *gstbasetransform_class;
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gstbasetransform_class = (GstBaseTransformClass *) klass;
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gstbasetransform_class->transform_caps =
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GST_DEBUG_FUNCPTR (gst_alpha_color_transform_caps);
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gstbasetransform_class->set_caps =
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GST_DEBUG_FUNCPTR (gst_alpha_color_set_caps);
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gstbasetransform_class->transform_ip =
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GST_DEBUG_FUNCPTR (gst_alpha_color_transform_ip);
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GST_DEBUG_CATEGORY_INIT (alpha_color_debug, "alphacolor", 0,
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"RGB->YUV colorspace conversion preserving the alpha channels");
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}
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static void
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gst_alpha_color_init (GstAlphaColor * alpha, GstAlphaColorClass * g_class)
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{
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GstBaseTransform *btrans = NULL;
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btrans = GST_BASE_TRANSFORM (alpha);
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btrans->always_in_place = TRUE;
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}
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static GstCaps *
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gst_alpha_color_transform_caps (GstBaseTransform * btrans,
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GstPadDirection direction, GstCaps * caps)
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{
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const GstCaps *tmpl_caps = NULL;
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GstCaps *result = NULL, *local_caps = NULL;
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guint i;
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local_caps = gst_caps_copy (caps);
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for (i = 0; i < gst_caps_get_size (local_caps); i++) {
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GstStructure *structure = gst_caps_get_structure (local_caps, i);
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/* Throw away the structure name and set it to transformed format */
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if (direction == GST_PAD_SINK) {
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gst_structure_set_name (structure, "video/x-raw-yuv");
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} else if (direction == GST_PAD_SRC) {
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gst_structure_set_name (structure, "video/x-raw-rgb");
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}
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/* Remove any specific parameter from the structure */
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gst_structure_remove_field (structure, "format");
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gst_structure_remove_field (structure, "endianness");
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gst_structure_remove_field (structure, "depth");
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gst_structure_remove_field (structure, "bpp");
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gst_structure_remove_field (structure, "red_mask");
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gst_structure_remove_field (structure, "green_mask");
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gst_structure_remove_field (structure, "blue_mask");
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gst_structure_remove_field (structure, "alpha_mask");
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}
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/* Get the appropriate template */
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if (direction == GST_PAD_SINK) {
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tmpl_caps = gst_static_pad_template_get_caps (&src_template);
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} else if (direction == GST_PAD_SRC) {
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tmpl_caps = gst_static_pad_template_get_caps (&sink_template);
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}
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/* Intersect with our template caps */
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result = gst_caps_intersect (local_caps, tmpl_caps);
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gst_caps_unref (local_caps);
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gst_caps_do_simplify (result);
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GST_LOG ("transformed %" GST_PTR_FORMAT " to %" GST_PTR_FORMAT, caps, result);
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return result;
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}
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static gboolean
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gst_alpha_color_set_caps (GstBaseTransform * btrans, GstCaps * incaps,
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GstCaps * outcaps)
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{
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GstAlphaColor *alpha;
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GstStructure *structure;
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gboolean ret;
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const GValue *fps;
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gint red_mask, alpha_mask;
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gint w, h, depth, bpp;
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alpha = GST_ALPHA_COLOR (btrans);
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structure = gst_caps_get_structure (incaps, 0);
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ret = gst_structure_get_int (structure, "width", &w);
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ret &= gst_structure_get_int (structure, "height", &h);
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fps = gst_structure_get_value (structure, "framerate");
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ret &= (fps != NULL && GST_VALUE_HOLDS_FRACTION (fps));
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ret &= gst_structure_get_int (structure, "red_mask", &red_mask);
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/* make sure these are really full RGBA caps */
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ret &= gst_structure_get_int (structure, "alpha_mask", &alpha_mask);
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ret &= gst_structure_get_int (structure, "depth", &depth);
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ret &= gst_structure_get_int (structure, "bpp", &bpp);
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if (!ret || alpha_mask == 0 || red_mask == 0 || depth != 32 || bpp != 32) {
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GST_DEBUG_OBJECT (alpha, "incomplete or non-RGBA input caps!");
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return FALSE;
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}
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alpha->in_width = w;
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alpha->in_height = h;
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alpha->in_rgba = TRUE;
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#if (G_BYTE_ORDER == G_BIG_ENDIAN)
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if (red_mask != 0x000000ff)
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#else
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if (red_mask != 0xff000000)
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#endif
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alpha->in_rgba = FALSE;
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return TRUE;
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}
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static void
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transform_rgb (guint8 * data, gint size)
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{
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guint8 y, u, v;
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while (size > 0) {
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y = data[0] * 0.299 + data[1] * 0.587 + data[2] * 0.114 + 0;
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u = data[0] * -0.169 + data[1] * -0.332 + data[2] * 0.500 + 128;
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v = data[0] * 0.500 + data[1] * -0.419 + data[2] * -0.0813 + 128;
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data[0] = data[3];
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data[1] = y;
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data[2] = u;
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data[3] = v;
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data += 4;
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size -= 4;
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}
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}
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static void
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transform_bgr (guint8 * data, gint size)
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{
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guint8 y, u, v;
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while (size > 0) {
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y = data[2] * 0.299 + data[1] * 0.587 + data[0] * 0.114 + 0;
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u = data[2] * -0.169 + data[1] * -0.332 + data[0] * 0.500 + 128;
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v = data[2] * 0.500 + data[1] * -0.419 + data[0] * -0.0813 + 128;
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data[0] = data[3];
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data[1] = y;
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data[2] = u;
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data[3] = v;
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data += 4;
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size -= 4;
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}
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}
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static GstFlowReturn
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gst_alpha_color_transform_ip (GstBaseTransform * btrans, GstBuffer * inbuf)
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{
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GstFlowReturn ret = GST_FLOW_OK;
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GstAlphaColor *alpha;
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alpha = GST_ALPHA_COLOR (btrans);
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/* Transform in place */
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if (alpha->in_rgba)
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transform_rgb (GST_BUFFER_DATA (inbuf), GST_BUFFER_SIZE (inbuf));
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else
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transform_bgr (GST_BUFFER_DATA (inbuf), GST_BUFFER_SIZE (inbuf));
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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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return gst_element_register (plugin, "alphacolor", GST_RANK_NONE,
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GST_TYPE_ALPHA_COLOR);
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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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"alphacolor",
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"RGBA to AYUV colorspace conversion preserving the alpha channel",
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plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
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