gstreamer/gst-libs/gst/idct/idct.c

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* 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.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <gst/gst.h>
#include <gst/idct/idct.h>
#include "dct.h"
static void gst_idct_int_sparse_idct (short *data);
GstIDCT *
gst_idct_new (GstIDCTMethod method)
{
GstIDCT *new = g_malloc (sizeof (GstIDCT));
new->need_transpose = FALSE;
if (method == GST_IDCT_DEFAULT) {
method = GST_IDCT_FAST_INT;
}
new->convert_sparse = gst_idct_int_sparse_idct;
switch (method) {
case GST_IDCT_FAST_INT:
GST_INFO ("using fast_int_idct");
gst_idct_init_fast_int_idct ();
new->convert = gst_idct_fast_int_idct;
break;
case GST_IDCT_INT:
GST_INFO ("using int_idct");
new->convert = gst_idct_int_idct;
break;
case GST_IDCT_FLOAT:
GST_INFO ("using float_idct");
gst_idct_init_float_idct ();
new->convert = gst_idct_float_idct;
break;
default:
GST_INFO ("method not supported");
g_free (new);
return NULL;
}
return new;
}
static void
gst_idct_int_sparse_idct (short *data)
{
short val;
gint32 v, *dp = (guint32 *) data;
v = *data;
if (v < 0) {
val = -v;
val += (8 >> 1);
val /= 8;
val = -val;
} else {
val = (v + (8 >> 1)) / 8;
}
v = ((val & 0xffff) | (val << 16));
dp[0] = v;
dp[1] = v;
dp[2] = v;
dp[3] = v;
dp[4] = v;
dp[5] = v;
dp[6] = v;
dp[7] = v;
dp[8] = v;
dp[9] = v;
dp[10] = v;
dp[11] = v;
dp[12] = v;
dp[13] = v;
dp[14] = v;
dp[15] = v;
dp[16] = v;
dp[17] = v;
dp[18] = v;
dp[19] = v;
dp[20] = v;
dp[21] = v;
dp[22] = v;
dp[23] = v;
dp[24] = v;
dp[25] = v;
dp[26] = v;
dp[27] = v;
dp[28] = v;
dp[29] = v;
dp[30] = v;
dp[31] = v;
}
void
gst_idct_destroy (GstIDCT * idct)
{
g_return_if_fail (idct != NULL);
g_free (idct);
}
static gboolean
plugin_init (GstPlugin * plugin)
{
return TRUE;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"gstidct",
"Accelerated IDCT routines",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE, GST_ORIGIN)