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 FFmpeg.
6 *
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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
26void ff_dct_unquantize_h263_armv5te(DCTELEM *block, int qmul, int qadd, int count);
27
28#ifdef ENABLE_ARM_TESTS
29/**
30 * h263 dequantizer supplementary function, it is performance critical and needs to
31 * have optimized implementations for each architecture. Is also used as a reference
32 * implementation in regression tests
33 */
34static inline void dct_unquantize_h263_helper_c(DCTELEM *block, int qmul, int qadd, int count)
35{
36    int i, level;
37    for (i = 0; i < count; i++) {
38        level = block[i];
39        if (level) {
40            if (level < 0) {
41                level = level * qmul - qadd;
42            } else {
43                level = level * qmul + qadd;
44            }
45            block[i] = level;
46        }
47    }
48}
49#endif
50
51static void dct_unquantize_h263_intra_armv5te(MpegEncContext *s,
52                                  DCTELEM *block, int n, int qscale)
53{
54    int level, qmul, qadd;
55    int nCoeffs;
56
57    assert(s->block_last_index[n]>=0);
58
59    qmul = qscale << 1;
60
61    if (!s->h263_aic) {
62        if (n < 4)
63            level = block[0] * s->y_dc_scale;
64        else
65            level = block[0] * s->c_dc_scale;
66        qadd = (qscale - 1) | 1;
67    }else{
68        qadd = 0;
69        level = block[0];
70    }
71    if(s->ac_pred)
72        nCoeffs=63;
73    else
74        nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
75
76    ff_dct_unquantize_h263_armv5te(block, qmul, qadd, nCoeffs + 1);
77    block[0] = level;
78}
79
80static void dct_unquantize_h263_inter_armv5te(MpegEncContext *s,
81                                  DCTELEM *block, int n, int qscale)
82{
83    int qmul, qadd;
84    int nCoeffs;
85
86    assert(s->block_last_index[n]>=0);
87
88    qadd = (qscale - 1) | 1;
89    qmul = qscale << 1;
90
91    nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
92
93    ff_dct_unquantize_h263_armv5te(block, qmul, qadd, nCoeffs + 1);
94}
95
96void MPV_common_init_armv5te(MpegEncContext *s)
97{
98    s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_armv5te;
99    s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_armv5te;
100}
101