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 Libav.
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.
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.
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
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
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
35 static inline void dct_unquantize_h263_helper_c(DCTELEM *block, int qmul, int qadd, int count)
38 for (i = 0; i < count; i++) {
42 level = level * qmul - qadd;
44 level = level * qmul + qadd;
52 static void dct_unquantize_h263_intra_armv5te(MpegEncContext *s,
53 DCTELEM *block, int n, int qscale)
55 int level, qmul, qadd;
58 assert(s->block_last_index[n]>=0);
64 level = block[0] * s->y_dc_scale;
66 level = block[0] * s->c_dc_scale;
67 qadd = (qscale - 1) | 1;
75 nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
77 ff_dct_unquantize_h263_armv5te(block, qmul, qadd, nCoeffs + 1);
81 static void dct_unquantize_h263_inter_armv5te(MpegEncContext *s,
82 DCTELEM *block, int n, int qscale)
87 assert(s->block_last_index[n]>=0);
89 qadd = (qscale - 1) | 1;
92 nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
94 ff_dct_unquantize_h263_armv5te(block, qmul, qadd, nCoeffs + 1);
97 void ff_MPV_common_init_armv5te(MpegEncContext *s)
99 s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_armv5te;
100 s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_armv5te;