2 * Optimization of some functions from mpegvideo.c for armv5te
3 * Copyright (c) 2007 Siarhei Siamashka <ssvb@users.sourceforge.net>
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavcodec/avcodec.h"
23 #include "libavcodec/dsputil.h"
24 #include "libavcodec/mpegvideo.h"
26 void ff_dct_unquantize_h263_armv5te(DCTELEM *block, int qmul, int qadd, int count);
28 #ifdef ENABLE_ARM_TESTS
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
34 static inline void dct_unquantize_h263_helper_c(DCTELEM *block, int qmul, int qadd, int count)
37 for (i = 0; i < count; i++) {
41 level = level * qmul - qadd;
43 level = level * qmul + qadd;
51 static void dct_unquantize_h263_intra_armv5te(MpegEncContext *s,
52 DCTELEM *block, int n, int qscale)
54 int level, qmul, qadd;
57 assert(s->block_last_index[n]>=0);
63 level = block[0] * s->y_dc_scale;
65 level = block[0] * s->c_dc_scale;
66 qadd = (qscale - 1) | 1;
74 nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
76 ff_dct_unquantize_h263_armv5te(block, qmul, qadd, nCoeffs + 1);
80 static void dct_unquantize_h263_inter_armv5te(MpegEncContext *s,
81 DCTELEM *block, int n, int qscale)
86 assert(s->block_last_index[n]>=0);
88 qadd = (qscale - 1) | 1;
91 nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
93 ff_dct_unquantize_h263_armv5te(block, qmul, qadd, nCoeffs + 1);
96 void MPV_common_init_armv5te(MpegEncContext *s)
98 s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_armv5te;
99 s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_armv5te;