2 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
5 * Copyright (C) 2001 FUKUCHI Kentarou
7 * EffecTV is free software. This library is free software;
8 * you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
25 * SECTION:element-vertigotv
27 * VertigoTV is a loopback alpha blending effector with rotating and scaling.
30 * <title>Example launch line</title>
32 * gst-launch -v videotestsrc ! vertigotv ! videoconvert ! autovideosink
33 * ]| This pipeline shows the effect of vertigotv on a test stream.
44 #include "gstvertigo.h"
46 #define gst_vertigotv_parent_class parent_class
47 G_DEFINE_TYPE (GstVertigoTV, gst_vertigotv, GST_TYPE_VIDEO_FILTER);
49 /* Filter signals and args */
57 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
58 #define CAPS_STR GST_VIDEO_CAPS_MAKE ("{ RGBx, BGRx }")
60 #define CAPS_STR GST_VIDEO_CAPS_MAKE ("{ xRGB, xBGR }")
63 static GstStaticPadTemplate gst_vertigotv_src_template =
64 GST_STATIC_PAD_TEMPLATE ("src",
67 GST_STATIC_CAPS (CAPS_STR)
70 static GstStaticPadTemplate gst_vertigotv_sink_template =
71 GST_STATIC_PAD_TEMPLATE ("sink",
74 GST_STATIC_CAPS (CAPS_STR)
78 gst_vertigotv_set_caps (GstBaseTransform * btrans, GstCaps * incaps,
81 GstVertigoTV *filter = GST_VERTIGOTV (btrans);
83 gint area, width, height;
85 if (!gst_video_info_from_caps (&info, incaps))
90 width = GST_VIDEO_INFO_WIDTH (&info);
91 height = GST_VIDEO_INFO_HEIGHT (&info);
93 area = width * height;
95 g_free (filter->buffer);
96 filter->buffer = (guint32 *) g_malloc0 (area * 2 * sizeof (guint32));
98 filter->current_buffer = filter->buffer;
99 filter->alt_buffer = filter->buffer + area;
107 GST_DEBUG_OBJECT (filter, "invalid caps received");
113 gst_vertigotv_set_parms (GstVertigoTV * filter)
121 dizz = sin (filter->phase) * 10 + sin (filter->phase * 1.9 + 5) * 5;
123 width = GST_VIDEO_INFO_WIDTH (&filter->info);
124 height = GST_VIDEO_INFO_HEIGHT (&filter->info);
129 t = (x * x + y * y) * filter->zoomrate;
131 if (width > height) {
135 vx = (x * (x - dizz) + y * y) / t;
139 vx = (x * (x + dizz) + y * y) / t;
146 vx = (x * x + y * (y - dizz)) / t;
150 vx = (x * x + y * (y + dizz)) / t;
154 filter->dx = vx * 65536;
155 filter->dy = vy * 65536;
156 filter->sx = (-vx * x + vy * y + x + cos (filter->phase * 5) * 2) * 65536;
157 filter->sy = (-vx * y - vy * x + y + sin (filter->phase * 6) * 2) * 65536;
159 filter->phase += filter->phase_increment;
160 if (filter->phase > 5700000)
165 gst_vertigotv_transform (GstBaseTransform * trans, GstBuffer * in,
168 GstVertigoTV *filter = GST_VERTIGOTV (trans);
169 guint32 *src, *dest, *p;
171 gint x, y, ox, oy, i, width, height, area, sstride, dstride;
172 GstClockTime timestamp, stream_time;
173 GstVideoFrame in_frame, out_frame;
175 timestamp = GST_BUFFER_TIMESTAMP (in);
177 gst_segment_to_stream_time (&trans->segment, GST_FORMAT_TIME, timestamp);
179 GST_DEBUG_OBJECT (filter, "sync to %" GST_TIME_FORMAT,
180 GST_TIME_ARGS (timestamp));
182 if (GST_CLOCK_TIME_IS_VALID (stream_time))
183 gst_object_sync_values (GST_OBJECT (filter), stream_time);
185 if (!gst_video_frame_map (&in_frame, &filter->info, in, GST_MAP_READ))
188 if (!gst_video_frame_map (&out_frame, &filter->info, out, GST_MAP_WRITE))
191 src = GST_VIDEO_FRAME_PLANE_DATA (&in_frame, 0);
192 sstride = GST_VIDEO_FRAME_PLANE_STRIDE (&in_frame, 0);
193 dest = GST_VIDEO_FRAME_PLANE_DATA (&out_frame, 0);
194 dstride = GST_VIDEO_FRAME_PLANE_STRIDE (&out_frame, 0);
196 width = GST_VIDEO_FRAME_WIDTH (&in_frame);
197 height = GST_VIDEO_FRAME_HEIGHT (&in_frame);
199 area = width * height;
204 gst_vertigotv_set_parms (filter);
205 p = filter->alt_buffer;
207 for (y = 0; y < height; y++) {
211 for (x = 0; x < width; x++) {
212 i = (oy >> 16) * width + (ox >> 16);
218 v = filter->current_buffer[i] & 0xfcfcff;
219 v = (v * 3) + (src[x] & 0xfcfcff);
221 *p++ = dest[x] = (v >> 2);
225 filter->sx -= filter->dy;
226 filter->sy += filter->dx;
232 p = filter->current_buffer;
233 filter->current_buffer = filter->alt_buffer;
234 filter->alt_buffer = p;
241 GST_DEBUG_OBJECT (filter, "invalid input frame");
242 return GST_FLOW_ERROR;
246 GST_DEBUG_OBJECT (filter, "invalid output frame");
247 gst_video_frame_unmap (&in_frame);
248 return GST_FLOW_ERROR;
254 gst_vertigotv_start (GstBaseTransform * trans)
256 GstVertigoTV *filter = GST_VERTIGOTV (trans);
264 gst_vertigotv_set_property (GObject * object, guint prop_id,
265 const GValue * value, GParamSpec * pspec)
267 GstVertigoTV *filter = GST_VERTIGOTV (object);
269 GST_OBJECT_LOCK (filter);
272 filter->phase_increment = g_value_get_float (value);
274 case PROP_ZOOM_SPEED:
275 filter->zoomrate = g_value_get_float (value);
280 GST_OBJECT_UNLOCK (filter);
284 gst_vertigotv_get_property (GObject * object, guint prop_id, GValue * value,
287 GstVertigoTV *filter = GST_VERTIGOTV (object);
291 g_value_set_float (value, filter->phase_increment);
293 case PROP_ZOOM_SPEED:
294 g_value_set_float (value, filter->zoomrate);
297 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
303 gst_vertigotv_finalize (GObject * object)
305 GstVertigoTV *filter = GST_VERTIGOTV (object);
307 g_free (filter->buffer);
308 filter->buffer = NULL;
310 G_OBJECT_CLASS (parent_class)->finalize (object);
314 gst_vertigotv_class_init (GstVertigoTVClass * klass)
316 GObjectClass *gobject_class = (GObjectClass *) klass;
317 GstElementClass *gstelement_class = (GstElementClass *) klass;
318 GstBaseTransformClass *trans_class = (GstBaseTransformClass *) klass;
320 gobject_class->set_property = gst_vertigotv_set_property;
321 gobject_class->get_property = gst_vertigotv_get_property;
322 gobject_class->finalize = gst_vertigotv_finalize;
324 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SPEED,
325 g_param_spec_float ("speed", "Speed", "Control the speed of movement",
326 0.01, 100.0, 0.02, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
327 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_ZOOM_SPEED,
328 g_param_spec_float ("zoom-speed", "Zoom Speed",
329 "Control the rate of zooming", 1.01, 1.1, 1.01,
330 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
332 gst_element_class_set_details_simple (gstelement_class, "VertigoTV effect",
333 "Filter/Effect/Video",
334 "A loopback alpha blending effector with rotating and scaling",
335 "Wim Taymans <wim.taymans@gmail.be>");
337 gst_element_class_add_pad_template (gstelement_class,
338 gst_static_pad_template_get (&gst_vertigotv_sink_template));
339 gst_element_class_add_pad_template (gstelement_class,
340 gst_static_pad_template_get (&gst_vertigotv_src_template));
342 trans_class->start = GST_DEBUG_FUNCPTR (gst_vertigotv_start);
343 trans_class->set_caps = GST_DEBUG_FUNCPTR (gst_vertigotv_set_caps);
344 trans_class->transform = GST_DEBUG_FUNCPTR (gst_vertigotv_transform);
348 gst_vertigotv_init (GstVertigoTV * filter)
350 filter->buffer = NULL;
352 filter->phase_increment = 0.02;
353 filter->zoomrate = 1.01;