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