PeerStreamer

/*

 * Optimization of some functions from mpegvideo.c for armv5te

 * Copyright (c) 2007 Siarhei Siamashka <ssvb@users.sourceforge.net>

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg is free software; you can redistribute it and/or

 * 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.

 *

 * FFmpeg is distributed in the hope that it will be useful,

 * 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

 * License along with FFmpeg; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

#include "libavcodec/avcodec.h"

#include "libavcodec/dsputil.h"

#include "libavcodec/mpegvideo.h"

#include "mpegvideo_arm.h"

void ff_dct_unquantize_h263_armv5te(DCTELEM *block, int qmul, int qadd, int count);

#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

 */

static inline void dct_unquantize_h263_helper_c(DCTELEM *block, int qmul, int qadd, int count)

{

    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,

                                  DCTELEM *block, int n, int qscale)

{

    int level, qmul, qadd;

    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] ];

    ff_dct_unquantize_h263_armv5te(block, qmul, qadd, nCoeffs + 1);

    block[0] = level;

}

static void dct_unquantize_h263_inter_armv5te(MpegEncContext *s,

                                  DCTELEM *block, int n, int qscale)

{

    int qmul, qadd;

    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] ];

    ff_dct_unquantize_h263_armv5te(block, qmul, qadd, nCoeffs + 1);

}

void MPV_common_init_armv5te(MpegEncContext *s)

{

    s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_armv5te;

    s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_armv5te;

}