yading@10: /*
yading@10:  * Optimization of some functions from mpegvideo.c for armv5te
yading@10:  * Copyright (c) 2007 Siarhei Siamashka <ssvb@users.sourceforge.net>
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include "libavutil/attributes.h"
yading@10: #include "libavutil/avassert.h"
yading@10: #include "libavcodec/avcodec.h"
yading@10: #include "libavcodec/mpegvideo.h"
yading@10: #include "mpegvideo_arm.h"
yading@10: 
yading@10: void ff_dct_unquantize_h263_armv5te(int16_t *block, int qmul, int qadd, int count);
yading@10: 
yading@10: #ifdef ENABLE_ARM_TESTS
yading@10: /**
yading@10:  * h263 dequantizer supplementary function, it is performance critical and needs to
yading@10:  * have optimized implementations for each architecture. Is also used as a reference
yading@10:  * implementation in regression tests
yading@10:  */
yading@10: static inline void dct_unquantize_h263_helper_c(int16_t *block, int qmul, int qadd, int count)
yading@10: {
yading@10:     int i, level;
yading@10:     for (i = 0; i < count; i++) {
yading@10:         level = block[i];
yading@10:         if (level) {
yading@10:             if (level < 0) {
yading@10:                 level = level * qmul - qadd;
yading@10:             } else {
yading@10:                 level = level * qmul + qadd;
yading@10:             }
yading@10:             block[i] = level;
yading@10:         }
yading@10:     }
yading@10: }
yading@10: #endif
yading@10: 
yading@10: static void dct_unquantize_h263_intra_armv5te(MpegEncContext *s,
yading@10:                                   int16_t *block, int n, int qscale)
yading@10: {
yading@10:     int level, qmul, qadd;
yading@10:     int nCoeffs;
yading@10: 
yading@10:     av_assert2(s->block_last_index[n]>=0);
yading@10: 
yading@10:     qmul = qscale << 1;
yading@10: 
yading@10:     if (!s->h263_aic) {
yading@10:         if (n < 4)
yading@10:             level = block[0] * s->y_dc_scale;
yading@10:         else
yading@10:             level = block[0] * s->c_dc_scale;
yading@10:         qadd = (qscale - 1) | 1;
yading@10:     }else{
yading@10:         qadd = 0;
yading@10:         level = block[0];
yading@10:     }
yading@10:     if(s->ac_pred)
yading@10:         nCoeffs=63;
yading@10:     else
yading@10:         nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
yading@10: 
yading@10:     ff_dct_unquantize_h263_armv5te(block, qmul, qadd, nCoeffs + 1);
yading@10:     block[0] = level;
yading@10: }
yading@10: 
yading@10: static void dct_unquantize_h263_inter_armv5te(MpegEncContext *s,
yading@10:                                   int16_t *block, int n, int qscale)
yading@10: {
yading@10:     int qmul, qadd;
yading@10:     int nCoeffs;
yading@10: 
yading@10:     av_assert2(s->block_last_index[n]>=0);
yading@10: 
yading@10:     qadd = (qscale - 1) | 1;
yading@10:     qmul = qscale << 1;
yading@10: 
yading@10:     nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
yading@10: 
yading@10:     ff_dct_unquantize_h263_armv5te(block, qmul, qadd, nCoeffs + 1);
yading@10: }
yading@10: 
yading@10: av_cold void ff_MPV_common_init_armv5te(MpegEncContext *s)
yading@10: {
yading@10:     s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_armv5te;
yading@10:     s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_armv5te;
yading@10: }