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
27void ff_dct_unquantize_h263_armv5te(DCTELEM *block, int qmul, int qadd, int count);
28
29#ifdef ENABLE_ARM_TESTS
30/**
31 * h263 dequantizer supplementary function, it is performance critical and needs to
32 * have optimized implementations for each architecture. Is also used as a reference
33 * implementation in regression tests
34 */
35static 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
52static void dct_unquantize_h263_intra_armv5te(MpegEncContext *s,
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
81static void dct_unquantize_h263_inter_armv5te(MpegEncContext *s,
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
97void MPV_common_init_armv5te(MpegEncContext *s)
98{
99    s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_armv5te;
100    s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_armv5te;
101}
102