mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-06-03 05:59:44 +00:00
001bbb7002
Original commit message from CVS: Added general IDCT library. Added IEEE testbed. Update to the windows codec loader. fixes in the riff parser/encoder. cleanup in the getbits/putbits API.
112 lines
2.8 KiB
C
112 lines
2.8 KiB
C
/* Gnome-Streamer
|
|
* 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.
|
|
*/
|
|
|
|
|
|
#include <config.h>
|
|
|
|
#include "gstidct.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) {
|
|
#ifdef HAVE_LIBMMX
|
|
method = GST_IDCT_MMX32;
|
|
#else
|
|
method = GST_IDCT_FAST_INT;
|
|
#endif
|
|
}
|
|
|
|
new->convert_sparse = gst_idct_int_sparse_idct;
|
|
|
|
switch (method) {
|
|
case GST_IDCT_FAST_INT:
|
|
g_print("GstIDCT: using fast_int_idct\n");
|
|
gst_idct_init_fast_int_idct();
|
|
new->convert = gst_idct_fast_int_idct;
|
|
break;
|
|
case GST_IDCT_INT:
|
|
g_print("GstIDCT: using int_idct\n");
|
|
new->convert = gst_idct_int_idct;
|
|
break;
|
|
case GST_IDCT_FLOAT:
|
|
g_print("GstIDCT: using float_idct\n");
|
|
gst_idct_init_float_idct();
|
|
new->convert = gst_idct_float_idct;
|
|
break;
|
|
case GST_IDCT_MMX:
|
|
g_print("GstIDCT: using MMX_idct\n");
|
|
new->convert = gst_idct_mmx_idct;
|
|
new->need_transpose = TRUE;
|
|
break;
|
|
case GST_IDCT_MMX32:
|
|
g_print("GstIDCT: using MMX32_idct\n");
|
|
new->convert = gst_idct_mmx32_idct;
|
|
new->need_transpose = TRUE;
|
|
break;
|
|
default:
|
|
g_print("GstIDCT: method not supported\n");
|
|
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);
|
|
}
|
|
|