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 "libavutil/attributes.h"
23#include "libavutil/avassert.h"
24#include "libavcodec/avcodec.h"
25#include "libavcodec/mpegvideo.h"
26#include "mpegvideo_arm.h"
27
28void ff_dct_unquantize_h263_armv5te(int16_t *block, int qmul, int qadd, int count);
29
30#ifdef ENABLE_ARM_TESTS
31/**
32 * h263 dequantizer supplementary function, it is performance critical and needs to
33 * have optimized implementations for each architecture. Is also used as a reference
34 * implementation in regression tests
35 */
36static inline void dct_unquantize_h263_helper_c(int16_t *block, int qmul, int qadd, int count)
37{
38    int i, level;
39    for (i = 0; i < count; i++) {
40        level = block[i];
41        if (level) {
42            if (level < 0) {
43                level = level * qmul - qadd;
44            } else {
45                level = level * qmul + qadd;
46            }
47            block[i] = level;
48        }
49    }
50}
51#endif
52
53static void dct_unquantize_h263_intra_armv5te(MpegEncContext *s,
54                                  int16_t *block, int n, int qscale)
55{
56    int level, qmul, qadd;
57    int nCoeffs;
58
59    av_assert2(s->block_last_index[n]>=0);
60
61    qmul = qscale << 1;
62
63    if (!s->h263_aic) {
64        if (n < 4)
65            level = block[0] * s->y_dc_scale;
66        else
67            level = block[0] * s->c_dc_scale;
68        qadd = (qscale - 1) | 1;
69    }else{
70        qadd = 0;
71        level = block[0];
72    }
73    if(s->ac_pred)
74        nCoeffs=63;
75    else
76        nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
77
78    ff_dct_unquantize_h263_armv5te(block, qmul, qadd, nCoeffs + 1);
79    block[0] = level;
80}
81
82static void dct_unquantize_h263_inter_armv5te(MpegEncContext *s,
83                                  int16_t *block, int n, int qscale)
84{
85    int qmul, qadd;
86    int nCoeffs;
87
88    av_assert2(s->block_last_index[n]>=0);
89
90    qadd = (qscale - 1) | 1;
91    qmul = qscale << 1;
92
93    nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
94
95    ff_dct_unquantize_h263_armv5te(block, qmul, qadd, nCoeffs + 1);
96}
97
98av_cold void ff_MPV_common_init_armv5te(MpegEncContext *s)
99{
100    s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_armv5te;
101    s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_armv5te;
102}
103