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ffmpeg / libavcodec / armv4l / mpegvideo_armv5te.c @ 782fc0c3

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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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#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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/* GCC 3.1 or higher is required to support symbolic names in assembly code */
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#if (__GNUC__ > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 1))
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/**
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 * Special optimized version of dct_unquantize_h263_helper_c, it requires the block
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 * to be at least 8 bytes aligned, and may process more elements than requested.
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 * But it is guaranteed to never process more than 64 elements provided that
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 * xxcount argument is <= 64, so it is safe. This macro is optimized for a common
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 * distribution of values for nCoeffs (they are mostly multiple of 8 plus one or
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 * two extra elements). So this macro processes data as 8 elements per loop iteration
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 * and contains optional 2 elements processing in the end.
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 *
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 * Inner loop should take 6 cycles per element on arm926ej-s (Nokia 770)
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 */
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#define dct_unquantize_h263_special_helper_armv5te(xxblock, xxqmul, xxqadd, xxcount) \
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({ DCTELEM *xblock = xxblock; \
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   int xqmul = xxqmul, xqadd = xxqadd, xcount = xxcount, xtmp; \
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   int xdata1, xdata2; \
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__asm__ volatile( \
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        "subs %[count], %[count], #2       \n\t" \
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        "ble 2f                            \n\t" \
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        "ldrd r4, [%[block], #0]           \n\t" \
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        "1:                                \n\t" \
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        "ldrd r6, [%[block], #8]           \n\t" \
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\
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        "rsbs %[data1], %[zero], r4, asr #16 \n\t" \
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        "addgt %[data1], %[qadd], #0       \n\t" \
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        "rsblt %[data1], %[qadd], #0       \n\t" \
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        "smlatbne %[data1], r4, %[qmul], %[data1] \n\t" \
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\
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        "rsbs %[data2], %[zero], r5, asr #16 \n\t" \
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        "addgt %[data2], %[qadd], #0       \n\t" \
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        "rsblt %[data2], %[qadd], #0       \n\t" \
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        "smlatbne %[data2], r5, %[qmul], %[data2] \n\t" \
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\
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        "rsbs %[tmp], %[zero], r4, asl #16 \n\t" \
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        "addgt %[tmp], %[qadd], #0         \n\t" \
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        "rsblt %[tmp], %[qadd], #0         \n\t" \
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        "smlabbne r4, r4, %[qmul], %[tmp]  \n\t" \
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\
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        "rsbs %[tmp], %[zero], r5, asl #16 \n\t" \
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        "addgt %[tmp], %[qadd], #0         \n\t" \
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        "rsblt %[tmp], %[qadd], #0         \n\t" \
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        "smlabbne r5, r5, %[qmul], %[tmp]  \n\t" \
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\
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        "strh r4, [%[block]], #2           \n\t" \
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        "strh %[data1], [%[block]], #2     \n\t" \
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        "strh r5, [%[block]], #2           \n\t" \
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        "strh %[data2], [%[block]], #2     \n\t" \
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\
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        "rsbs %[data1], %[zero], r6, asr #16 \n\t" \
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        "addgt %[data1], %[qadd], #0        \n\t" \
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        "rsblt %[data1], %[qadd], #0        \n\t" \
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        "smlatbne %[data1], r6, %[qmul], %[data1] \n\t" \
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\
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        "rsbs %[data2], %[zero], r7, asr #16 \n\t" \
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        "addgt %[data2], %[qadd], #0        \n\t" \
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        "rsblt %[data2], %[qadd], #0        \n\t" \
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        "smlatbne %[data2], r7, %[qmul], %[data2] \n\t" \
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\
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        "rsbs %[tmp], %[zero], r6, asl #16  \n\t" \
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        "addgt %[tmp], %[qadd], #0          \n\t" \
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        "rsblt %[tmp], %[qadd], #0          \n\t" \
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        "smlabbne r6, r6, %[qmul], %[tmp]   \n\t" \
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\
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        "rsbs %[tmp], %[zero], r7, asl #16  \n\t" \
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        "addgt %[tmp], %[qadd], #0          \n\t" \
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        "rsblt %[tmp], %[qadd], #0          \n\t" \
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        "smlabbne r7, r7, %[qmul], %[tmp]   \n\t" \
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\
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        "strh r6, [%[block]], #2            \n\t" \
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        "strh %[data1], [%[block]], #2      \n\t" \
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        "strh r7, [%[block]], #2            \n\t" \
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        "strh %[data2], [%[block]], #2      \n\t" \
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\
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        "subs %[count], %[count], #8        \n\t" \
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        "ldrgtd r4, [%[block], #0]          \n\t" /* load data early to avoid load/use pipeline stall */ \
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        "bgt 1b                             \n\t" \
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\
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        "adds %[count], %[count], #2        \n\t" \
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        "ble  3f                            \n\t" \
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        "2:                                 \n\t" \
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        "ldrsh %[data1], [%[block], #0]     \n\t" \
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        "ldrsh %[data2], [%[block], #2]     \n\t" \
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        "mov  %[tmp], %[qadd]               \n\t" \
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        "cmp  %[data1], #0                  \n\t" \
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        "rsblt %[tmp], %[qadd], #0          \n\t" \
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        "smlabbne %[data1], %[data1], %[qmul], %[tmp] \n\t" \
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        "mov  %[tmp], %[qadd]               \n\t" \
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        "cmp  %[data2], #0                  \n\t" \
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        "rsblt %[tmp], %[qadd], #0          \n\t" \
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        "smlabbne %[data2], %[data2], %[qmul], %[tmp] \n\t" \
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        "strh %[data1], [%[block]], #2      \n\t" \
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        "strh %[data2], [%[block]], #2      \n\t" \
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        "3:                                 \n\t" \
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        : [block] "+&r" (xblock), [count] "+&r" (xcount), [tmp] "=&r" (xtmp), \
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          [data1] "=&r" (xdata1), [data2] "=&r" (xdata2)  \
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        : [qmul] "r" (xqmul), [qadd] "r" (xqadd), [zero] "r" (0) \
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        : "r4", "r5", "r6", "r7", "cc", "memory" \
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); \
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})
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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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    dct_unquantize_h263_special_helper_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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    dct_unquantize_h263_special_helper_armv5te(block, qmul, qadd, nCoeffs + 1);
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}
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#define HAVE_DCT_UNQUANTIZE_H263_ARMV5TE_OPTIMIZED
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#endif
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void MPV_common_init_armv5te(MpegEncContext *s)
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{
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#ifdef HAVE_DCT_UNQUANTIZE_H263_ARMV5TE_OPTIMIZED
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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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#endif
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}