nengel@2: /*
nengel@2:  * Optimization of some functions from mpegvideo.c for armv5te
nengel@2:  * Copyright (c) 2007 Siarhei Siamashka <ssvb@users.sourceforge.net>
nengel@2:  *
nengel@2:  * This file is part of FFmpeg.
nengel@2:  *
nengel@2:  * FFmpeg is free software; you can redistribute it and/or
nengel@2:  * modify it under the terms of the GNU Lesser General Public
nengel@2:  * License as published by the Free Software Foundation; either
nengel@2:  * version 2.1 of the License, or (at your option) any later version.
nengel@2:  *
nengel@2:  * FFmpeg is distributed in the hope that it will be useful,
nengel@2:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
nengel@2:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
nengel@2:  * Lesser General Public License for more details.
nengel@2:  *
nengel@2:  * You should have received a copy of the GNU Lesser General Public
nengel@2:  * License along with FFmpeg; if not, write to the Free Software
nengel@2:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
nengel@2:  */
nengel@2: 
nengel@2: #include "libavcodec/avcodec.h"
nengel@2: #include "libavcodec/dsputil.h"
nengel@2: #include "libavcodec/mpegvideo.h"
nengel@2: #include "mpegvideo_arm.h"
nengel@2: 
nengel@2: void ff_dct_unquantize_h263_armv5te(DCTELEM *block, int qmul, int qadd, int count);
nengel@2: 
nengel@2: #ifdef ENABLE_ARM_TESTS
nengel@2: /**
nengel@2:  * h263 dequantizer supplementary function, it is performance critical and needs to
nengel@2:  * have optimized implementations for each architecture. Is also used as a reference
nengel@2:  * implementation in regression tests
nengel@2:  */
nengel@2: static inline void dct_unquantize_h263_helper_c(DCTELEM *block, int qmul, int qadd, int count)
nengel@2: {
nengel@2:     int i, level;
nengel@2:     for (i = 0; i < count; i++) {
nengel@2:         level = block[i];
nengel@2:         if (level) {
nengel@2:             if (level < 0) {
nengel@2:                 level = level * qmul - qadd;
nengel@2:             } else {
nengel@2:                 level = level * qmul + qadd;
nengel@2:             }
nengel@2:             block[i] = level;
nengel@2:         }
nengel@2:     }
nengel@2: }
nengel@2: #endif
nengel@2: 
nengel@2: static void dct_unquantize_h263_intra_armv5te(MpegEncContext *s,
nengel@2:                                   DCTELEM *block, int n, int qscale)
nengel@2: {
nengel@2:     int level, qmul, qadd;
nengel@2:     int nCoeffs;
nengel@2: 
nengel@2:     assert(s->block_last_index[n]>=0);
nengel@2: 
nengel@2:     qmul = qscale << 1;
nengel@2: 
nengel@2:     if (!s->h263_aic) {
nengel@2:         if (n < 4)
nengel@2:             level = block[0] * s->y_dc_scale;
nengel@2:         else
nengel@2:             level = block[0] * s->c_dc_scale;
nengel@2:         qadd = (qscale - 1) | 1;
nengel@2:     }else{
nengel@2:         qadd = 0;
nengel@2:         level = block[0];
nengel@2:     }
nengel@2:     if(s->ac_pred)
nengel@2:         nCoeffs=63;
nengel@2:     else
nengel@2:         nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
nengel@2: 
nengel@2:     ff_dct_unquantize_h263_armv5te(block, qmul, qadd, nCoeffs + 1);
nengel@2:     block[0] = level;
nengel@2: }
nengel@2: 
nengel@2: static void dct_unquantize_h263_inter_armv5te(MpegEncContext *s,
nengel@2:                                   DCTELEM *block, int n, int qscale)
nengel@2: {
nengel@2:     int qmul, qadd;
nengel@2:     int nCoeffs;
nengel@2: 
nengel@2:     assert(s->block_last_index[n]>=0);
nengel@2: 
nengel@2:     qadd = (qscale - 1) | 1;
nengel@2:     qmul = qscale << 1;
nengel@2: 
nengel@2:     nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
nengel@2: 
nengel@2:     ff_dct_unquantize_h263_armv5te(block, qmul, qadd, nCoeffs + 1);
nengel@2: }
nengel@2: 
nengel@2: void MPV_common_init_armv5te(MpegEncContext *s)
nengel@2: {
nengel@2:     s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_armv5te;
nengel@2:     s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_armv5te;
nengel@2: }