--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/gst_plugins_base/gst/videoscale/gstvideoscale.c Thu Dec 17 08:53:32 2009 +0200
@@ -0,0 +1,959 @@
+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ * Copyright (C) 2005 David Schleef <ds@schleef.org>
+ *
+ * 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:element-videoscale
+ * @see_also: videorate, ffmpegcolorspace
+ *
+ * <refsect2>
+ * <para>
+ * This element resizes video frames. By default the element will try to
+ * negotiate to the same size on the source and sinkpad so that no scaling
+ * is needed. It is therefore safe to insert this element in a pipeline to
+ * get more robust behaviour without any cost if no scaling is needed.
+ * </para>
+ * <para>
+ * This element supports a wide range of color spaces including various YUV and
+ * RGB formats and is therefore generally able to operate anywhere in a
+ * pipeline.
+ * </para>
+ * <title>Example pipelines</title>
+ * <para>
+ * <programlisting>
+ * gst-launch -v filesrc location=videotestsrc.ogg ! oggdemux ! theoradec ! ffmpegcolorspace ! videoscale ! ximagesink
+ * </programlisting>
+ * Decode an Ogg/Theora and display the video using ximagesink. Since
+ * ximagesink cannot perform scaling, the video scaling will be performed by
+ * videoscale when you resize the video window.
+ * To create the test Ogg/Theora file refer to the documentation of theoraenc.
+ * </para>
+ * <para>
+ * <programlisting>
+ * gst-launch -v filesrc location=videotestsrc.ogg ! oggdemux ! theoradec ! videoscale ! video/x-raw-yuv, width=50 ! xvimagesink
+ * </programlisting>
+ * Decode an Ogg/Theora and display the video using xvimagesink with a width of
+ * 50.
+ * </para>
+ * </refsect2>
+ *
+ * Last reviewed on 2006-03-02 (0.10.4)
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <string.h>
+
+#include <gst/video/video.h>
+#include <gst/liboil.h>
+
+
+#include "gstvideoscale.h"
+#include "vs_image.h"
+#include "vs_4tap.h"
+
+#include <glib_global.h>
+
+
+/* debug variable definition */
+GST_DEBUG_CATEGORY (video_scale_debug);
+
+/* elementfactory information */
+static const GstElementDetails video_scale_details =
+GST_ELEMENT_DETAILS ("Video scaler",
+ "Filter/Effect/Video",
+ "Resizes video",
+ "Wim Taymans <wim.taymans@chello.be>");
+
+#define DEFAULT_PROP_METHOD GST_VIDEO_SCALE_NEAREST
+
+enum
+{
+ PROP_0,
+ PROP_METHOD
+ /* FILL ME */
+};
+
+/* can't handle width/height of 1 yet, since we divide a lot by (n-1) */
+#undef GST_VIDEO_SIZE_RANGE
+#define GST_VIDEO_SIZE_RANGE "(int) [ 2, MAX ]"
+
+static GstStaticCaps gst_video_scale_format_caps[] = {
+ GST_STATIC_CAPS (GST_VIDEO_CAPS_RGBx),
+ GST_STATIC_CAPS (GST_VIDEO_CAPS_xRGB),
+ GST_STATIC_CAPS (GST_VIDEO_CAPS_BGRx),
+ GST_STATIC_CAPS (GST_VIDEO_CAPS_xBGR),
+ GST_STATIC_CAPS (GST_VIDEO_CAPS_RGBA),
+ GST_STATIC_CAPS (GST_VIDEO_CAPS_ARGB),
+ GST_STATIC_CAPS (GST_VIDEO_CAPS_BGRA),
+ GST_STATIC_CAPS (GST_VIDEO_CAPS_ABGR),
+ GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB),
+ GST_STATIC_CAPS (GST_VIDEO_CAPS_BGR),
+ GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("AYUV")),
+ GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("YUY2")),
+ GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("YVYU")),
+ GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("UYVY")),
+ GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("Y800")),
+ GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("I420")),
+ GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("YV12")),
+ GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB_16),
+ GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB_15)
+};
+
+enum
+{
+ GST_VIDEO_SCALE_RGBx = 0,
+ GST_VIDEO_SCALE_xRGB,
+ GST_VIDEO_SCALE_BGRx,
+ GST_VIDEO_SCALE_xBGR,
+ GST_VIDEO_SCALE_RGBA,
+ GST_VIDEO_SCALE_ARGB,
+ GST_VIDEO_SCALE_BGRA,
+ GST_VIDEO_SCALE_ABGR,
+ GST_VIDEO_SCALE_RGB,
+ GST_VIDEO_SCALE_BGR,
+ GST_VIDEO_SCALE_AYUV,
+ GST_VIDEO_SCALE_YUY2,
+ GST_VIDEO_SCALE_YVYU,
+ GST_VIDEO_SCALE_UYVY,
+ GST_VIDEO_SCALE_Y,
+ GST_VIDEO_SCALE_I420,
+ GST_VIDEO_SCALE_YV12,
+ GST_VIDEO_SCALE_RGB565,
+ GST_VIDEO_SCALE_RGB555
+};
+
+#define GST_TYPE_VIDEO_SCALE_METHOD (gst_video_scale_method_get_type())
+static GType
+gst_video_scale_method_get_type (void)
+{
+ static GType video_scale_method_type = 0;
+ static const GEnumValue video_scale_methods[] = {
+ {GST_VIDEO_SCALE_NEAREST, "Nearest Neighbour", "nearest-neighbour"},
+ {GST_VIDEO_SCALE_BILINEAR, "Bilinear", "bilinear"},
+ {GST_VIDEO_SCALE_4TAP, "4-tap", "4-tap"},
+ {0, NULL, NULL},
+ };
+
+ if (!video_scale_method_type) {
+ video_scale_method_type =
+ g_enum_register_static ("GstVideoScaleMethod", video_scale_methods);
+ }
+ return video_scale_method_type;
+}
+
+static GstCaps *
+gst_video_scale_get_capslist (void)
+{
+ static GstCaps *caps;
+
+ if (caps == NULL) {
+ int i;
+
+ caps = gst_caps_new_empty ();
+ for (i = 0; i < G_N_ELEMENTS (gst_video_scale_format_caps); i++)
+ gst_caps_append (caps,
+ gst_caps_make_writable
+ (gst_static_caps_get (&gst_video_scale_format_caps[i])));
+ }
+
+ return caps;
+}
+
+static GstPadTemplate *
+gst_video_scale_src_template_factory (void)
+{
+ return gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
+ gst_caps_ref (gst_video_scale_get_capslist ()));
+}
+
+static GstPadTemplate *
+gst_video_scale_sink_template_factory (void)
+{
+ return gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
+ gst_caps_ref (gst_video_scale_get_capslist ()));
+}
+
+
+static void gst_video_scale_base_init (gpointer g_class);
+static void gst_video_scale_class_init (GstVideoScaleClass * klass);
+static void gst_video_scale_init (GstVideoScale * videoscale);
+static void gst_video_scale_finalize (GstVideoScale * videoscale);
+static gboolean gst_video_scale_src_event (GstBaseTransform * trans,
+ GstEvent * event);
+
+/* base transform vmethods */
+static GstCaps *gst_video_scale_transform_caps (GstBaseTransform * trans,
+ GstPadDirection direction, GstCaps * caps);
+static gboolean gst_video_scale_set_caps (GstBaseTransform * trans,
+ GstCaps * in, GstCaps * out);
+static gboolean gst_video_scale_get_unit_size (GstBaseTransform * trans,
+ GstCaps * caps, guint * size);
+static GstFlowReturn gst_video_scale_transform (GstBaseTransform * trans,
+ GstBuffer * in, GstBuffer * out);
+static void gst_video_scale_fixate_caps (GstBaseTransform * base,
+ GstPadDirection direction, GstCaps * caps, GstCaps * othercaps);
+
+static void gst_video_scale_set_property (GObject * object, guint prop_id,
+ const GValue * value, GParamSpec * pspec);
+static void gst_video_scale_get_property (GObject * object, guint prop_id,
+ GValue * value, GParamSpec * pspec);
+
+static GstElementClass *parent_class = NULL;
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+
+
+GType
+gst_video_scale_get_type (void)
+{
+ static GType video_scale_type = 0;
+
+ if (!video_scale_type) {
+ static const GTypeInfo video_scale_info = {
+ sizeof (GstVideoScaleClass),
+ gst_video_scale_base_init,
+ NULL,
+ (GClassInitFunc) gst_video_scale_class_init,
+ NULL,
+ NULL,
+ sizeof (GstVideoScale),
+ 0,
+ (GInstanceInitFunc) gst_video_scale_init,
+ };
+
+ video_scale_type =
+ g_type_register_static (GST_TYPE_BASE_TRANSFORM, "GstVideoScale",
+ &video_scale_info, 0);
+ }
+ return video_scale_type;
+}
+
+static void
+gst_video_scale_base_init (gpointer g_class)
+{
+ GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
+
+ gst_element_class_set_details (element_class, &video_scale_details);
+
+ gst_element_class_add_pad_template (element_class,
+ gst_video_scale_sink_template_factory ());
+ gst_element_class_add_pad_template (element_class,
+ gst_video_scale_src_template_factory ());
+}
+
+static void
+gst_video_scale_class_init (GstVideoScaleClass * klass)
+{
+ GObjectClass *gobject_class;
+ GstBaseTransformClass *trans_class;
+
+ gobject_class = (GObjectClass *) klass;
+ trans_class = (GstBaseTransformClass *) klass;
+
+ gobject_class->finalize = (GObjectFinalizeFunc) gst_video_scale_finalize;
+ gobject_class->set_property = gst_video_scale_set_property;
+ gobject_class->get_property = gst_video_scale_get_property;
+
+ g_object_class_install_property (gobject_class, PROP_METHOD,
+ g_param_spec_enum ("method", "method", "method",
+ GST_TYPE_VIDEO_SCALE_METHOD, DEFAULT_PROP_METHOD, G_PARAM_READWRITE));
+
+ trans_class->transform_caps =
+ GST_DEBUG_FUNCPTR (gst_video_scale_transform_caps);
+ trans_class->set_caps = GST_DEBUG_FUNCPTR (gst_video_scale_set_caps);
+ trans_class->get_unit_size =
+ GST_DEBUG_FUNCPTR (gst_video_scale_get_unit_size);
+ trans_class->transform = GST_DEBUG_FUNCPTR (gst_video_scale_transform);
+ trans_class->fixate_caps = GST_DEBUG_FUNCPTR (gst_video_scale_fixate_caps);
+ trans_class->src_event = GST_DEBUG_FUNCPTR (gst_video_scale_src_event);
+
+ trans_class->passthrough_on_same_caps = TRUE;
+
+ parent_class = g_type_class_peek_parent (klass);
+}
+
+static void
+gst_video_scale_init (GstVideoScale * videoscale)
+{
+ gst_base_transform_set_qos_enabled (GST_BASE_TRANSFORM (videoscale), TRUE);
+ videoscale->tmp_buf = NULL;
+ videoscale->method = DEFAULT_PROP_METHOD;
+}
+
+static void
+gst_video_scale_finalize (GstVideoScale * videoscale)
+{
+ if (videoscale->tmp_buf)
+ g_free (videoscale->tmp_buf);
+
+ G_OBJECT_CLASS (parent_class)->finalize (G_OBJECT (videoscale));
+}
+
+static void
+gst_video_scale_set_property (GObject * object, guint prop_id,
+ const GValue * value, GParamSpec * pspec)
+{
+ GstVideoScale *vscale = GST_VIDEO_SCALE (object);
+
+ switch (prop_id) {
+ case PROP_METHOD:
+ GST_OBJECT_LOCK (vscale);
+ vscale->method = g_value_get_enum (value);
+ GST_OBJECT_UNLOCK (vscale);
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+static void
+gst_video_scale_get_property (GObject * object, guint prop_id, GValue * value,
+ GParamSpec * pspec)
+{
+ GstVideoScale *vscale = GST_VIDEO_SCALE (object);
+
+ switch (prop_id) {
+ case PROP_METHOD:
+ GST_OBJECT_LOCK (vscale);
+ g_value_set_enum (value, vscale->method);
+ GST_OBJECT_UNLOCK (vscale);
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+static GstCaps *
+gst_video_scale_transform_caps (GstBaseTransform * trans,
+ GstPadDirection direction, GstCaps * caps)
+{
+ GstVideoScale *videoscale;
+ GstCaps *ret;
+ GstStructure *structure;
+ const GValue *par;
+ gint method;
+
+ /* this function is always called with a simple caps */
+ g_return_val_if_fail (GST_CAPS_IS_SIMPLE (caps), NULL);
+
+ videoscale = GST_VIDEO_SCALE (trans);
+
+ GST_OBJECT_LOCK (videoscale);
+ method = videoscale->method;
+ GST_OBJECT_UNLOCK (videoscale);
+
+ structure = gst_caps_get_structure (caps, 0);
+
+ /* check compatibility of format and method before we copy the input caps */
+ if (method == GST_VIDEO_SCALE_4TAP) {
+ guint32 fourcc;
+
+ if (!gst_structure_has_name (structure, "video/x-raw-yuv"))
+ goto method_not_implemented_for_format;
+ if (!gst_structure_get_fourcc (structure, "format", &fourcc))
+ goto method_not_implemented_for_format;
+ if (fourcc != GST_MAKE_FOURCC ('I', '4', '2', '0') &&
+ fourcc != GST_MAKE_FOURCC ('Y', 'V', '1', '2'))
+ goto method_not_implemented_for_format;
+ }
+
+ ret = gst_caps_copy (caps);
+ structure = gst_caps_get_structure (ret, 0);
+
+ gst_structure_set (structure,
+ "width", GST_TYPE_INT_RANGE, 1, G_MAXINT,
+ "height", GST_TYPE_INT_RANGE, 1, G_MAXINT, NULL);
+
+ /* if pixel aspect ratio, make a range of it */
+ if ((par = gst_structure_get_value (structure, "pixel-aspect-ratio"))) {
+ GstCaps *copy;
+ GstStructure *cstruct;
+
+ /* copy input PAR first, this is the prefered PAR */
+ gst_structure_set_value (structure, "pixel-aspect-ratio", par);
+
+ /* then make a copy with a fraction range as a second choice */
+ copy = gst_caps_copy (ret);
+ cstruct = gst_caps_get_structure (copy, 0);
+ gst_structure_set (cstruct,
+ "pixel-aspect-ratio", GST_TYPE_FRACTION_RANGE, 0, 1, G_MAXINT, 1, NULL);
+
+ /* and append */
+ gst_caps_append (ret, copy);
+ }
+
+ GST_DEBUG_OBJECT (trans, "returning caps: %" GST_PTR_FORMAT, ret);
+
+ return ret;
+
+method_not_implemented_for_format:
+ {
+ GST_DEBUG_OBJECT (trans, "method %d not implemented for format %"
+ GST_PTR_FORMAT ", returning empty caps", method, caps);
+ return gst_caps_new_empty ();
+ }
+}
+
+static int
+gst_video_scale_get_format (GstCaps * caps)
+{
+ int i;
+ GstCaps *icaps, *scaps;
+
+ for (i = 0; i < G_N_ELEMENTS (gst_video_scale_format_caps); i++) {
+ scaps = gst_static_caps_get (&gst_video_scale_format_caps[i]);
+ icaps = gst_caps_intersect (caps, scaps);
+ if (!gst_caps_is_empty (icaps)) {
+ gst_caps_unref (icaps);
+ return i;
+ }
+ gst_caps_unref (icaps);
+ }
+
+ return -1;
+}
+
+/* calculate the size of a buffer */
+static gboolean
+gst_video_scale_prepare_size (GstVideoScale * videoscale, gint format,
+ VSImage * img, gint width, gint height, guint * size)
+{
+ gboolean res = TRUE;
+
+ img->width = width;
+ img->height = height;
+
+ switch (format) {
+ case GST_VIDEO_SCALE_RGBx:
+ case GST_VIDEO_SCALE_xRGB:
+ case GST_VIDEO_SCALE_BGRx:
+ case GST_VIDEO_SCALE_xBGR:
+ case GST_VIDEO_SCALE_RGBA:
+ case GST_VIDEO_SCALE_ARGB:
+ case GST_VIDEO_SCALE_BGRA:
+ case GST_VIDEO_SCALE_ABGR:
+ case GST_VIDEO_SCALE_AYUV:
+ img->stride = img->width * 4;
+ *size = img->stride * img->height;
+ break;
+ case GST_VIDEO_SCALE_RGB:
+ case GST_VIDEO_SCALE_BGR:
+ img->stride = GST_ROUND_UP_4 (img->width * 3);
+ *size = img->stride * img->height;
+ break;
+ case GST_VIDEO_SCALE_YUY2:
+ case GST_VIDEO_SCALE_YVYU:
+ case GST_VIDEO_SCALE_UYVY:
+ img->stride = GST_ROUND_UP_4 (img->width * 2);
+ *size = img->stride * img->height;
+ break;
+ case GST_VIDEO_SCALE_Y:
+ img->stride = GST_ROUND_UP_4 (img->width);
+ *size = img->stride * img->height;
+ break;
+ case GST_VIDEO_SCALE_I420:
+ case GST_VIDEO_SCALE_YV12:
+ {
+ gulong img_u_stride, img_u_height;
+
+ img->stride = GST_ROUND_UP_4 (img->width);
+
+ img_u_height = GST_ROUND_UP_2 (img->height) / 2;
+ img_u_stride = GST_ROUND_UP_4 (img->stride / 2);
+
+ *size = img->stride * GST_ROUND_UP_2 (img->height) +
+ 2 * img_u_stride * img_u_height;
+ break;
+ }
+ case GST_VIDEO_SCALE_RGB565:
+ img->stride = GST_ROUND_UP_4 (img->width * 2);
+ *size = img->stride * img->height;
+ break;
+ case GST_VIDEO_SCALE_RGB555:
+ img->stride = GST_ROUND_UP_4 (img->width * 2);
+ *size = img->stride * img->height;
+ break;
+ default:
+ goto unknown_format;
+ }
+
+ return res;
+
+ /* ERRORS */
+unknown_format:
+ {
+ GST_ELEMENT_ERROR (videoscale, STREAM, NOT_IMPLEMENTED, (NULL),
+ ("Unsupported format %d", videoscale->format));
+ return FALSE;
+ }
+}
+
+static gboolean
+parse_caps (GstCaps * caps, gint * format, gint * width, gint * height)
+{
+ gboolean ret;
+ GstStructure *structure;
+
+ structure = gst_caps_get_structure (caps, 0);
+ ret = gst_structure_get_int (structure, "width", width);
+ ret &= gst_structure_get_int (structure, "height", height);
+
+ if (format)
+ *format = gst_video_scale_get_format (caps);
+
+ return ret;
+}
+
+static gboolean
+gst_video_scale_set_caps (GstBaseTransform * trans, GstCaps * in, GstCaps * out)
+{
+ GstVideoScale *videoscale;
+ gboolean ret;
+
+ videoscale = GST_VIDEO_SCALE (trans);
+
+ ret = parse_caps (in, &videoscale->format, &videoscale->from_width,
+ &videoscale->from_height);
+ ret &= parse_caps (out, NULL, &videoscale->to_width, &videoscale->to_height);
+ if (!ret)
+ goto done;
+
+ if (!(ret = gst_video_scale_prepare_size (videoscale, videoscale->format,
+ &videoscale->src, videoscale->from_width, videoscale->from_height,
+ &videoscale->src_size)))
+ /* prepare size has posted an error when it returns FALSE */
+ goto done;
+
+ if (!(ret = gst_video_scale_prepare_size (videoscale, videoscale->format,
+ &videoscale->dest, videoscale->to_width, videoscale->to_height,
+ &videoscale->dest_size)))
+ /* prepare size has posted an error when it returns FALSE */
+ goto done;
+
+ if (videoscale->tmp_buf)
+ g_free (videoscale->tmp_buf);
+
+ videoscale->tmp_buf = g_malloc (videoscale->dest.stride * 4);
+
+ /* FIXME: par */
+ GST_DEBUG_OBJECT (videoscale, "from=%dx%d, size %d -> to=%dx%d, size %d",
+ videoscale->from_width, videoscale->from_height, videoscale->src_size,
+ videoscale->to_width, videoscale->to_height, videoscale->dest_size);
+
+done:
+ return ret;
+}
+
+static gboolean
+gst_video_scale_get_unit_size (GstBaseTransform * trans, GstCaps * caps,
+ guint * size)
+{
+ GstVideoScale *videoscale;
+ gint format, width, height;
+ VSImage img;
+
+ g_assert (size);
+
+ videoscale = GST_VIDEO_SCALE (trans);
+
+ if (!parse_caps (caps, &format, &width, &height))
+ return FALSE;
+
+ if (!gst_video_scale_prepare_size (videoscale, format, &img, width, height,
+ size))
+ return FALSE;
+
+ return TRUE;
+}
+
+static void
+gst_video_scale_fixate_caps (GstBaseTransform * base, GstPadDirection direction,
+ GstCaps * caps, GstCaps * othercaps)
+{
+ GstStructure *ins, *outs;
+ const GValue *from_par, *to_par;
+
+ g_return_if_fail (gst_caps_is_fixed (caps));
+
+ GST_DEBUG_OBJECT (base, "trying to fixate othercaps %" GST_PTR_FORMAT
+ " based on caps %" GST_PTR_FORMAT, othercaps, caps);
+
+ ins = gst_caps_get_structure (caps, 0);
+ outs = gst_caps_get_structure (othercaps, 0);
+
+ from_par = gst_structure_get_value (ins, "pixel-aspect-ratio");
+ to_par = gst_structure_get_value (outs, "pixel-aspect-ratio");
+
+ /* we have both PAR but they might not be fixated */
+ if (from_par && to_par) {
+ gint from_w, from_h, from_par_n, from_par_d, to_par_n, to_par_d;
+ gint count = 0, w = 0, h = 0;
+ guint num, den;
+
+ /* from_par should be fixed */
+ g_return_if_fail (gst_value_is_fixed (from_par));
+
+ from_par_n = gst_value_get_fraction_numerator (from_par);
+ from_par_d = gst_value_get_fraction_denominator (from_par);
+
+ /* fixate the out PAR */
+ if (!gst_value_is_fixed (to_par)) {
+ GST_DEBUG_OBJECT (base, "fixating to_par to %dx%d", from_par_n,
+ from_par_d);
+ gst_structure_fixate_field_nearest_fraction (outs, "pixel-aspect-ratio",
+ from_par_n, from_par_d);
+ }
+
+ to_par_n = gst_value_get_fraction_numerator (to_par);
+ to_par_d = gst_value_get_fraction_denominator (to_par);
+
+ /* if both width and height are already fixed, we can't do anything
+ * about it anymore */
+ if (gst_structure_get_int (outs, "width", &w))
+ ++count;
+ if (gst_structure_get_int (outs, "height", &h))
+ ++count;
+ if (count == 2) {
+ GST_DEBUG_OBJECT (base, "dimensions already set to %dx%d, not fixating",
+ w, h);
+ return;
+ }
+
+ gst_structure_get_int (ins, "width", &from_w);
+ gst_structure_get_int (ins, "height", &from_h);
+
+ if (!gst_video_calculate_display_ratio (&num, &den, from_w, from_h,
+ from_par_n, from_par_d, to_par_n, to_par_d)) {
+ GST_ELEMENT_ERROR (base, CORE, NEGOTIATION, (NULL),
+ ("Error calculating the output scaled size - integer overflow"));
+ return;
+ }
+
+ GST_DEBUG_OBJECT (base,
+ "scaling input with %dx%d and PAR %d/%d to output PAR %d/%d",
+ from_w, from_h, from_par_n, from_par_d, to_par_n, to_par_d);
+ GST_DEBUG_OBJECT (base, "resulting output should respect ratio of %d/%d",
+ num, den);
+
+ /* now find a width x height that respects this display ratio.
+ * prefer those that have one of w/h the same as the incoming video
+ * using wd / hd = num / den */
+
+ /* if one of the output width or height is fixed, we work from there */
+ if (h) {
+ GST_DEBUG_OBJECT (base, "height is fixed,scaling width");
+ w = (guint) gst_util_uint64_scale_int (h, num, den);
+ } else if (w) {
+ GST_DEBUG_OBJECT (base, "width is fixed, scaling height");
+ h = (guint) gst_util_uint64_scale_int (w, den, num);
+ } else {
+ /* none of width or height is fixed, figure out both of them based only on
+ * the input width and height */
+ /* check hd / den is an integer scale factor, and scale wd with the PAR */
+ if (from_h % den == 0) {
+ GST_DEBUG_OBJECT (base, "keeping video height");
+ h = from_h;
+ w = (guint) gst_util_uint64_scale_int (h, num, den);
+ } else if (from_w % num == 0) {
+ GST_DEBUG_OBJECT (base, "keeping video width");
+ w = from_w;
+ h = (guint) gst_util_uint64_scale_int (w, den, num);
+ } else {
+ GST_DEBUG_OBJECT (base, "approximating but keeping video height");
+ h = from_h;
+ w = (guint) gst_util_uint64_scale_int (h, num, den);
+ }
+ }
+ GST_DEBUG_OBJECT (base, "scaling to %dx%d", w, h);
+
+ /* now fixate */
+ gst_structure_fixate_field_nearest_int (outs, "width", w);
+ gst_structure_fixate_field_nearest_int (outs, "height", h);
+ } else {
+ gint width, height;
+
+ if (gst_structure_get_int (ins, "width", &width)) {
+ if (gst_structure_has_field (outs, "width")) {
+ gst_structure_fixate_field_nearest_int (outs, "width", width);
+ }
+ }
+ if (gst_structure_get_int (ins, "height", &height)) {
+ if (gst_structure_has_field (outs, "height")) {
+ gst_structure_fixate_field_nearest_int (outs, "height", height);
+ }
+ }
+ }
+
+ GST_DEBUG_OBJECT (base, "fixated othercaps to %" GST_PTR_FORMAT, othercaps);
+}
+
+static gboolean
+gst_video_scale_prepare_image (gint format, GstBuffer * buf,
+ VSImage * img, VSImage * img_u, VSImage * img_v)
+{
+ gboolean res = TRUE;
+
+ img->pixels = GST_BUFFER_DATA (buf);
+
+ switch (format) {
+ case GST_VIDEO_SCALE_I420:
+ case GST_VIDEO_SCALE_YV12:
+ img_u->pixels = img->pixels + GST_ROUND_UP_2 (img->height) * img->stride;
+ img_u->height = GST_ROUND_UP_2 (img->height) / 2;
+ img_u->width = GST_ROUND_UP_2 (img->width) / 2;
+ img_u->stride = GST_ROUND_UP_4 (img_u->width);
+ memcpy (img_v, img_u, sizeof (*img_v));
+ img_v->pixels = img_u->pixels + img_u->height * img_u->stride;
+ break;
+ default:
+ break;
+ }
+ return res;
+}
+
+static GstFlowReturn
+gst_video_scale_transform (GstBaseTransform * trans, GstBuffer * in,
+ GstBuffer * out)
+{
+ GstVideoScale *videoscale;
+ GstFlowReturn ret = GST_FLOW_OK;
+ VSImage *dest;
+ VSImage *src;
+ VSImage dest_u;
+ VSImage dest_v;
+ VSImage src_u;
+ VSImage src_v;
+ gint method;
+
+ videoscale = GST_VIDEO_SCALE (trans);
+
+ GST_OBJECT_LOCK (videoscale);
+ method = videoscale->method;
+ GST_OBJECT_UNLOCK (videoscale);
+
+ src = &videoscale->src;
+ dest = &videoscale->dest;
+
+ gst_video_scale_prepare_image (videoscale->format, in, src, &src_u, &src_v);
+ gst_video_scale_prepare_image (videoscale->format, out, dest, &dest_u,
+ &dest_v);
+
+ switch (method) {
+ case GST_VIDEO_SCALE_NEAREST:
+ switch (videoscale->format) {
+ case GST_VIDEO_SCALE_RGBx:
+ case GST_VIDEO_SCALE_xRGB:
+ case GST_VIDEO_SCALE_BGRx:
+ case GST_VIDEO_SCALE_xBGR:
+ case GST_VIDEO_SCALE_RGBA:
+ case GST_VIDEO_SCALE_ARGB:
+ case GST_VIDEO_SCALE_BGRA:
+ case GST_VIDEO_SCALE_ABGR:
+ case GST_VIDEO_SCALE_AYUV:
+ vs_image_scale_nearest_RGBA (dest, src, videoscale->tmp_buf);
+ break;
+ case GST_VIDEO_SCALE_RGB:
+ case GST_VIDEO_SCALE_BGR:
+ vs_image_scale_nearest_RGB (dest, src, videoscale->tmp_buf);
+ break;
+ case GST_VIDEO_SCALE_YUY2:
+ case GST_VIDEO_SCALE_YVYU:
+ vs_image_scale_nearest_YUYV (dest, src, videoscale->tmp_buf);
+ break;
+ case GST_VIDEO_SCALE_UYVY:
+ vs_image_scale_nearest_UYVY (dest, src, videoscale->tmp_buf);
+ break;
+ case GST_VIDEO_SCALE_Y:
+ vs_image_scale_nearest_Y (dest, src, videoscale->tmp_buf);
+ break;
+ case GST_VIDEO_SCALE_I420:
+ case GST_VIDEO_SCALE_YV12:
+ vs_image_scale_nearest_Y (dest, src, videoscale->tmp_buf);
+ vs_image_scale_nearest_Y (&dest_u, &src_u, videoscale->tmp_buf);
+ vs_image_scale_nearest_Y (&dest_v, &src_v, videoscale->tmp_buf);
+ break;
+ case GST_VIDEO_SCALE_RGB565:
+ vs_image_scale_nearest_RGB565 (dest, src, videoscale->tmp_buf);
+ break;
+ case GST_VIDEO_SCALE_RGB555:
+ vs_image_scale_nearest_RGB555 (dest, src, videoscale->tmp_buf);
+ break;
+ default:
+ goto unsupported;
+ }
+ break;
+ case GST_VIDEO_SCALE_BILINEAR:
+ switch (videoscale->format) {
+ case GST_VIDEO_SCALE_RGBx:
+ case GST_VIDEO_SCALE_xRGB:
+ case GST_VIDEO_SCALE_BGRx:
+ case GST_VIDEO_SCALE_xBGR:
+ case GST_VIDEO_SCALE_RGBA:
+ case GST_VIDEO_SCALE_ARGB:
+ case GST_VIDEO_SCALE_BGRA:
+ case GST_VIDEO_SCALE_ABGR:
+ case GST_VIDEO_SCALE_AYUV:
+ vs_image_scale_linear_RGBA (dest, src, videoscale->tmp_buf);
+ break;
+ case GST_VIDEO_SCALE_RGB:
+ case GST_VIDEO_SCALE_BGR:
+ vs_image_scale_linear_RGB (dest, src, videoscale->tmp_buf);
+ break;
+ case GST_VIDEO_SCALE_YUY2:
+ case GST_VIDEO_SCALE_YVYU:
+ vs_image_scale_linear_YUYV (dest, src, videoscale->tmp_buf);
+ break;
+ case GST_VIDEO_SCALE_UYVY:
+ vs_image_scale_linear_UYVY (dest, src, videoscale->tmp_buf);
+ break;
+ case GST_VIDEO_SCALE_Y:
+ vs_image_scale_linear_Y (dest, src, videoscale->tmp_buf);
+ break;
+ case GST_VIDEO_SCALE_I420:
+ case GST_VIDEO_SCALE_YV12:
+ vs_image_scale_linear_Y (dest, src, videoscale->tmp_buf);
+ vs_image_scale_linear_Y (&dest_u, &src_u, videoscale->tmp_buf);
+ vs_image_scale_linear_Y (&dest_v, &src_v, videoscale->tmp_buf);
+ break;
+ case GST_VIDEO_SCALE_RGB565:
+ vs_image_scale_linear_RGB565 (dest, src, videoscale->tmp_buf);
+ break;
+ case GST_VIDEO_SCALE_RGB555:
+ vs_image_scale_linear_RGB555 (dest, src, videoscale->tmp_buf);
+ break;
+ default:
+ goto unsupported;
+ }
+ break;
+ case GST_VIDEO_SCALE_4TAP:
+ switch (videoscale->format) {
+ case GST_VIDEO_SCALE_I420:
+ case GST_VIDEO_SCALE_YV12:
+ vs_image_scale_4tap_Y (dest, src, videoscale->tmp_buf);
+ vs_image_scale_4tap_Y (&dest_u, &src_u, videoscale->tmp_buf);
+ vs_image_scale_4tap_Y (&dest_v, &src_v, videoscale->tmp_buf);
+ break;
+ default:
+ /* FIXME: update gst_video_scale_transform_caps once RGB and/or
+ * other YUV formats work too */
+ goto unsupported;
+ }
+ break;
+ default:
+ goto unknown_mode;
+ }
+
+ GST_LOG_OBJECT (videoscale, "pushing buffer of %d bytes",
+ GST_BUFFER_SIZE (out));
+
+ return ret;
+
+ /* ERRORS */
+unsupported:
+ {
+ GST_ELEMENT_ERROR (videoscale, STREAM, NOT_IMPLEMENTED, (NULL),
+ ("Unsupported format %d for scaling method %d",
+ videoscale->format, method));
+ return GST_FLOW_ERROR;
+ }
+unknown_mode:
+ {
+ GST_ELEMENT_ERROR (videoscale, STREAM, NOT_IMPLEMENTED, (NULL),
+ ("Unknown scaling method %d", videoscale->method));
+ return GST_FLOW_ERROR;
+ }
+}
+
+static gboolean
+gst_video_scale_src_event (GstBaseTransform * trans, GstEvent * event)
+{
+ GstVideoScale *videoscale;
+ gboolean ret;
+ double a;
+ GstStructure *structure;
+
+ videoscale = GST_VIDEO_SCALE (trans);
+
+ GST_DEBUG_OBJECT (videoscale, "handling %s event",
+ GST_EVENT_TYPE_NAME (event));
+
+ switch (GST_EVENT_TYPE (event)) {
+ case GST_EVENT_NAVIGATION:
+ event =
+ GST_EVENT (gst_mini_object_make_writable (GST_MINI_OBJECT (event)));
+
+ structure = (GstStructure *) gst_event_get_structure (event);
+ if (gst_structure_get_double (structure, "pointer_x", &a)) {
+ gst_structure_set (structure, "pointer_x", G_TYPE_DOUBLE,
+ a * videoscale->from_width / videoscale->to_width, NULL);
+ }
+ if (gst_structure_get_double (structure, "pointer_y", &a)) {
+ gst_structure_set (structure, "pointer_y", G_TYPE_DOUBLE,
+ a * videoscale->from_height / videoscale->to_height, NULL);
+ }
+ break;
+ case GST_EVENT_QOS:
+ break;
+ default:
+ break;
+ }
+
+ ret = GST_BASE_TRANSFORM_CLASS (parent_class)->src_event (trans, event);
+
+ return ret;
+}
+
+static gboolean
+plugin_init (GstPlugin * plugin)
+{
+ #ifndef __SYMBIAN32__
+ oil_init ();
+ #endif
+ if (!gst_element_register (plugin, "videoscale", GST_RANK_NONE,
+ GST_TYPE_VIDEO_SCALE))
+ return FALSE;
+
+ GST_DEBUG_CATEGORY_INIT (video_scale_debug, "videoscale", 0,
+ "videoscale element");
+
+ vs_4tap_init ();
+
+ return TRUE;
+}
+
+GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
+ GST_VERSION_MINOR,
+ "videoscale",
+ "Resizes video", plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME,
+ GST_PACKAGE_ORIGIN);
+
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+GstPluginDesc* _GST_PLUGIN_DESC()
+{
+ return &gst_plugin_desc;
+}