libavcodec/arm/mpegvideo_armv5te.c

   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 "libavcodec/avcodec.h"
  23 #include "libavcodec/dsputil.h"
  24 #include "libavcodec/mpegvideo.h"
  25
  26 void ff_dct_unquantize_h263_armv5te(DCTELEM *block, int qmul, int qadd, int count);
  27
  28 #ifdef ENABLE_ARM_TESTS
  29 /**
  30  * h263 dequantizer supplementary function, it is performance critical and needs to
  31  * have optimized implementations for each architecture. Is also used as a reference
  32  * implementation in regression tests
  33  */
  34 static inline void dct_unquantize_h263_helper_c(DCTELEM *block, int qmul, int qadd, int count)
  35 {
  36     int i, level;
  37     for (i = 0; i < count; i++) {
  38         level = block[i];
  39         if (level) {
  40             if (level < 0) {
  41                 level = level * qmul - qadd;
  42             } else {
  43                 level = level * qmul + qadd;
  44             }
  45             block[i] = level;
  46         }
  47     }
  48 }
  49 #endif
  50
  51 static void dct_unquantize_h263_intra_armv5te(MpegEncContext *s,
  52                                   DCTELEM *block, int n, int qscale)
  53 {
  54     int level, qmul, qadd;
  55     int nCoeffs;
  56
  57     assert(s->block_last_index[n]>=0);
  58
  59     qmul = qscale << 1;
  60
  61     if (!s->h263_aic) {
  62         if (n < 4)
  63             level = block[0] * s->y_dc_scale;
  64         else
  65             level = block[0] * s->c_dc_scale;
  66         qadd = (qscale - 1) | 1;
  67     }else{
  68         qadd = 0;
  69         level = block[0];
  70     }
  71     if(s->ac_pred)
  72         nCoeffs=63;
  73     else
  74         nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
  75
  76     ff_dct_unquantize_h263_armv5te(block, qmul, qadd, nCoeffs + 1);
  77     block[0] = level;
  78 }
  79
  80 static void dct_unquantize_h263_inter_armv5te(MpegEncContext *s,
  81                                   DCTELEM *block, int n, int qscale)
  82 {
  83     int qmul, qadd;
  84     int nCoeffs;
  85
  86     assert(s->block_last_index[n]>=0);
  87
  88     qadd = (qscale - 1) | 1;
  89     qmul = qscale << 1;
  90
  91     nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
  92
  93     ff_dct_unquantize_h263_armv5te(block, qmul, qadd, nCoeffs + 1);
  94 }
  95
  96 void MPV_common_init_armv5te(MpegEncContext *s)
  97 {
  98     s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_armv5te;
  99     s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_armv5te;
 100 }