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 Libav. 6 * 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. 11 * 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. 16 * 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 20 */ 21 22#include "libavcodec/avcodec.h" 23#include "libavcodec/dsputil.h" 24#include "libavcodec/mpegvideo.h" 25#include "mpegvideo_arm.h" 26 27void ff_dct_unquantize_h263_armv5te(DCTELEM *block, int qmul, int qadd, int count); 28 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 */ 35static 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 51 52static void dct_unquantize_h263_intra_armv5te(MpegEncContext *s, 53 DCTELEM *block, int n, int qscale) 54{ 55 int level, qmul, qadd; 56 int nCoeffs; 57 58 assert(s->block_last_index[n]>=0); 59 60 qmul = qscale << 1; 61 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] ]; 76 77 ff_dct_unquantize_h263_armv5te(block, qmul, qadd, nCoeffs + 1); 78 block[0] = level; 79} 80 81static void dct_unquantize_h263_inter_armv5te(MpegEncContext *s, 82 DCTELEM *block, int n, int qscale) 83{ 84 int qmul, qadd; 85 int nCoeffs; 86 87 assert(s->block_last_index[n]>=0); 88 89 qadd = (qscale - 1) | 1; 90 qmul = qscale << 1; 91 92 nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ]; 93 94 ff_dct_unquantize_h263_armv5te(block, qmul, qadd, nCoeffs + 1); 95} 96 97void 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} 102