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ffmpeg / libavcodec / arm / mpegvideo_armv5te.c @ a2fc0f6a

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