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libavcodec/arm/mpegvideo_armv5te.c

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00001 /*
00002  * Optimization of some functions from mpegvideo.c for armv5te
00003  * Copyright (c) 2007 Siarhei Siamashka <ssvb@users.sourceforge.net>
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include "libavcodec/avcodec.h"
00023 #include "libavcodec/dsputil.h"
00024 #include "libavcodec/mpegvideo.h"
00025 #include "mpegvideo_arm.h"
00026 
00027 void ff_dct_unquantize_h263_armv5te(DCTELEM *block, int qmul, int qadd, int count);
00028 
00029 #ifdef ENABLE_ARM_TESTS
00030 
00035 static inline void dct_unquantize_h263_helper_c(DCTELEM *block, int qmul, int qadd, int count)
00036 {
00037     int i, level;
00038     for (i = 0; i < count; i++) {
00039         level = block[i];
00040         if (level) {
00041             if (level < 0) {
00042                 level = level * qmul - qadd;
00043             } else {
00044                 level = level * qmul + qadd;
00045             }
00046             block[i] = level;
00047         }
00048     }
00049 }
00050 #endif
00051 
00052 static void dct_unquantize_h263_intra_armv5te(MpegEncContext *s,
00053                                   DCTELEM *block, int n, int qscale)
00054 {
00055     int level, qmul, qadd;
00056     int nCoeffs;
00057 
00058     assert(s->block_last_index[n]>=0);
00059 
00060     qmul = qscale << 1;
00061 
00062     if (!s->h263_aic) {
00063         if (n < 4)
00064             level = block[0] * s->y_dc_scale;
00065         else
00066             level = block[0] * s->c_dc_scale;
00067         qadd = (qscale - 1) | 1;
00068     }else{
00069         qadd = 0;
00070         level = block[0];
00071     }
00072     if(s->ac_pred)
00073         nCoeffs=63;
00074     else
00075         nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
00076 
00077     ff_dct_unquantize_h263_armv5te(block, qmul, qadd, nCoeffs + 1);
00078     block[0] = level;
00079 }
00080 
00081 static void dct_unquantize_h263_inter_armv5te(MpegEncContext *s,
00082                                   DCTELEM *block, int n, int qscale)
00083 {
00084     int qmul, qadd;
00085     int nCoeffs;
00086 
00087     assert(s->block_last_index[n]>=0);
00088 
00089     qadd = (qscale - 1) | 1;
00090     qmul = qscale << 1;
00091 
00092     nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
00093 
00094     ff_dct_unquantize_h263_armv5te(block, qmul, qadd, nCoeffs + 1);
00095 }
00096 
00097 void MPV_common_init_armv5te(MpegEncContext *s)
00098 {
00099     s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_armv5te;
00100     s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_armv5te;
00101 }

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