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ttadsp.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include "ttadsp.h"
20 
21 static void ttafilter_process_dec_c(int32_t *qm, int32_t *dx, int32_t *dl,
22  int32_t *error, int32_t *in, int32_t shift,
23  int32_t round) {
24  if (*error < 0) {
25  qm[0] -= dx[0]; qm[1] -= dx[1]; qm[2] -= dx[2]; qm[3] -= dx[3];
26  qm[4] -= dx[4]; qm[5] -= dx[5]; qm[6] -= dx[6]; qm[7] -= dx[7];
27  } else if (*error > 0) {
28  qm[0] += dx[0]; qm[1] += dx[1]; qm[2] += dx[2]; qm[3] += dx[3];
29  qm[4] += dx[4]; qm[5] += dx[5]; qm[6] += dx[6]; qm[7] += dx[7];
30  }
31 
32  round += dl[0] * qm[0] + dl[1] * qm[1] + dl[2] * qm[2] + dl[3] * qm[3] +
33  dl[4] * qm[4] + dl[5] * qm[5] + dl[6] * qm[6] + dl[7] * qm[7];
34 
35  dx[0] = dx[1]; dx[1] = dx[2]; dx[2] = dx[3]; dx[3] = dx[4];
36  dl[0] = dl[1]; dl[1] = dl[2]; dl[2] = dl[3]; dl[3] = dl[4];
37 
38  dx[4] = ((dl[4] >> 30) | 1);
39  dx[5] = ((dl[5] >> 30) | 2) & ~1;
40  dx[6] = ((dl[6] >> 30) | 2) & ~1;
41  dx[7] = ((dl[7] >> 30) | 4) & ~3;
42 
43  *error = *in;
44  *in += (round >> shift);
45 
46  dl[4] = -dl[5]; dl[5] = -dl[6];
47  dl[6] = *in - dl[7]; dl[7] = *in;
48  dl[5] += dl[6]; dl[4] += dl[5];
49 }
50 
52 {
54 
55  if (ARCH_X86)
57 }