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 "libavutil/attributes.h"
23 #include "libavutil/avassert.h"
24 #include "libavcodec/avcodec.h"
25 #include "libavcodec/dsputil.h"
26 #include "libavcodec/mpegvideo.h"
27 #include "mpegvideo_arm.h"
29 void ff_dct_unquantize_h263_armv5te(int16_t *block, int qmul, int qadd, int count);
31 #ifdef ENABLE_ARM_TESTS
33 * h263 dequantizer supplementary function, it is performance critical and needs to
34 * have optimized implementations for each architecture. Is also used as a reference
35 * implementation in regression tests
37 static inline void dct_unquantize_h263_helper_c(int16_t *block, int qmul, int qadd, int count)
40 for (i = 0; i < count; i++) {
44 level = level * qmul - qadd;
46 level = level * qmul + qadd;
54 static void dct_unquantize_h263_intra_armv5te(MpegEncContext *s,
55 int16_t *block, int n, int qscale)
57 int level, qmul, qadd;
60 av_assert2(s->block_last_index[n]>=0);
66 level = block[0] * s->y_dc_scale;
68 level = block[0] * s->c_dc_scale;
69 qadd = (qscale - 1) | 1;
77 nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
79 ff_dct_unquantize_h263_armv5te(block, qmul, qadd, nCoeffs + 1);
83 static void dct_unquantize_h263_inter_armv5te(MpegEncContext *s,
84 int16_t *block, int n, int qscale)
89 av_assert2(s->block_last_index[n]>=0);
91 qadd = (qscale - 1) | 1;
94 nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
96 ff_dct_unquantize_h263_armv5te(block, qmul, qadd, nCoeffs + 1);
99 av_cold void ff_MPV_common_init_armv5te(MpegEncContext *s)
101 s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_armv5te;
102 s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_armv5te;