mpegvideo_armv5te.c
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1 /*
2  * Optimization of some functions from mpegvideo.c for armv5te
3  * Copyright (c) 2007 Siarhei Siamashka <ssvb@users.sourceforge.net>
4  *
5  * This file is part of Libav.
6  *
7  * Libav is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * Libav is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavcodec/avcodec.h"
23 #include "libavcodec/dsputil.h"
24 #include "libavcodec/mpegvideo.h"
25 #include "mpegvideo_arm.h"
26 
27 void ff_dct_unquantize_h263_armv5te(DCTELEM *block, int qmul, int qadd, int count);
28 
29 #ifdef ENABLE_ARM_TESTS
30 
35 static inline void dct_unquantize_h263_helper_c(DCTELEM *block, int qmul, int qadd, int count)
36 {
37  int i, level;
38  for (i = 0; i < count; i++) {
39  level = block[i];
40  if (level) {
41  if (level < 0) {
42  level = level * qmul - qadd;
43  } else {
44  level = level * qmul + qadd;
45  }
46  block[i] = level;
47  }
48  }
49 }
50 #endif
51 
53  DCTELEM *block, int n, int qscale)
54 {
55  int level, qmul, qadd;
56  int nCoeffs;
57 
58  assert(s->block_last_index[n]>=0);
59 
60  qmul = qscale << 1;
61 
62  if (!s->h263_aic) {
63  if (n < 4)
64  level = block[0] * s->y_dc_scale;
65  else
66  level = block[0] * s->c_dc_scale;
67  qadd = (qscale - 1) | 1;
68  }else{
69  qadd = 0;
70  level = block[0];
71  }
72  if(s->ac_pred)
73  nCoeffs=63;
74  else
75  nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
76 
77  ff_dct_unquantize_h263_armv5te(block, qmul, qadd, nCoeffs + 1);
78  block[0] = level;
79 }
80 
82  DCTELEM *block, int n, int qscale)
83 {
84  int qmul, qadd;
85  int nCoeffs;
86 
87  assert(s->block_last_index[n]>=0);
88 
89  qadd = (qscale - 1) | 1;
90  qmul = qscale << 1;
91 
92  nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
93 
94  ff_dct_unquantize_h263_armv5te(block, qmul, qadd, nCoeffs + 1);
95 }
96 
98 {
101 }