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view libavcodec/arm/mpegvideo_armv5te.c @ 2:897f711a7157
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| author | Nina Engelhardt <nengel@mailbox.tu-berlin.de> |
|---|---|
| date | Tue, 25 Sep 2012 15:55:33 +0200 |
| parents | |
| children |
line source
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 */
22 #include "libavcodec/avcodec.h"
23 #include "libavcodec/dsputil.h"
24 #include "libavcodec/mpegvideo.h"
25 #include "mpegvideo_arm.h"
27 void ff_dct_unquantize_h263_armv5te(DCTELEM *block, int qmul, int qadd, int count);
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 */
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
52 static void dct_unquantize_h263_intra_armv5te(MpegEncContext *s,
53 DCTELEM *block, int n, int qscale)
54 {
55 int level, qmul, qadd;
56 int nCoeffs;
58 assert(s->block_last_index[n]>=0);
60 qmul = qscale << 1;
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] ];
77 ff_dct_unquantize_h263_armv5te(block, qmul, qadd, nCoeffs + 1);
78 block[0] = level;
79 }
81 static void dct_unquantize_h263_inter_armv5te(MpegEncContext *s,
82 DCTELEM *block, int n, int qscale)
83 {
84 int qmul, qadd;
85 int nCoeffs;
87 assert(s->block_last_index[n]>=0);
89 qadd = (qscale - 1) | 1;
90 qmul = qscale << 1;
92 nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
94 ff_dct_unquantize_h263_armv5te(block, qmul, qadd, nCoeffs + 1);
95 }
97 void 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 }