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