mpegvideo_armv5te.c 3 KB
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/*
 * Optimization of some functions from mpegvideo.c for armv5te
 * Copyright (c) 2007 Siarhei Siamashka <ssvb@users.sourceforge.net>
 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
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 * Libav is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
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 * License along with Libav; 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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#include "libavutil/attributes.h"
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#include "libavcodec/avcodec.h"
#include "libavcodec/mpegvideo.h"
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#include "mpegvideo_arm.h"
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void ff_dct_unquantize_h263_armv5te(int16_t *block, int qmul, int qadd, int count);
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#ifdef ENABLE_ARM_TESTS
/**
 * h263 dequantizer supplementary function, it is performance critical and needs to
 * have optimized implementations for each architecture. Is also used as a reference
 * implementation in regression tests
 */
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static inline void dct_unquantize_h263_helper_c(int16_t *block, int qmul, int qadd, int count)
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{
    int i, level;
    for (i = 0; i < count; i++) {
        level = block[i];
        if (level) {
            if (level < 0) {
                level = level * qmul - qadd;
            } else {
                level = level * qmul + qadd;
            }
            block[i] = level;
        }
    }
}
#endif

static void dct_unquantize_h263_intra_armv5te(MpegEncContext *s,
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                                  int16_t *block, int n, int qscale)
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{
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    int level, qmul, qadd;
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    int nCoeffs;

    assert(s->block_last_index[n]>=0);

    qmul = qscale << 1;

    if (!s->h263_aic) {
        if (n < 4)
            level = block[0] * s->y_dc_scale;
        else
            level = block[0] * s->c_dc_scale;
        qadd = (qscale - 1) | 1;
    }else{
        qadd = 0;
        level = block[0];
    }
    if(s->ac_pred)
        nCoeffs=63;
    else
        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;
}

static void dct_unquantize_h263_inter_armv5te(MpegEncContext *s,
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                                  int16_t *block, int n, int qscale)
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{
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    int qmul, qadd;
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    int nCoeffs;

    assert(s->block_last_index[n]>=0);

    qadd = (qscale - 1) | 1;
    qmul = qscale << 1;

    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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av_cold void ff_MPV_common_init_armv5te(MpegEncContext *s)
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{
    s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_armv5te;
    s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_armv5te;
}