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/libavcodec/arm/mpegvideo_armv5te.c

http://github.com/FFmpeg/FFmpeg
C | 102 lines | 63 code | 14 blank | 25 comment | 7 complexity | 424de6655672b76c37eb3edddff75b9d MD5 | raw file
  1/*
  2 * Optimization of some functions from mpegvideo.c for armv5te
  3 * Copyright (c) 2007 Siarhei Siamashka <ssvb@users.sourceforge.net>
  4 *
  5 * This file is part of FFmpeg.
  6 *
  7 * FFmpeg is free software; you can redistribute it and/or
  8 * modify it under the terms of the GNU Lesser General Public
  9 * License as published by the Free Software Foundation; either
 10 * version 2.1 of the License, or (at your option) any later version.
 11 *
 12 * FFmpeg is distributed in the hope that it will be useful,
 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 15 * Lesser General Public License for more details.
 16 *
 17 * You should have received a copy of the GNU Lesser General Public
 18 * License along with FFmpeg; if not, write to the Free Software
 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 20 */
 21
 22#include "libavutil/attributes.h"
 23#include "libavutil/avassert.h"
 24#include "libavcodec/avcodec.h"
 25#include "libavcodec/mpegvideo.h"
 26#include "mpegvideo_arm.h"
 27
 28void ff_dct_unquantize_h263_armv5te(int16_t *block, int qmul, int qadd, int count);
 29
 30#ifdef ENABLE_ARM_TESTS
 31/**
 32 * H.263 dequantizer supplementary function, it is performance critical and needs to
 33 * have optimized implementations for each architecture. Is also used as a reference
 34 * implementation in regression tests
 35 */
 36static inline void dct_unquantize_h263_helper_c(int16_t *block, int qmul, int qadd, int count)
 37{
 38    int i, level;
 39    for (i = 0; i < count; i++) {
 40        level = block[i];
 41        if (level) {
 42            if (level < 0) {
 43                level = level * qmul - qadd;
 44            } else {
 45                level = level * qmul + qadd;
 46            }
 47            block[i] = level;
 48        }
 49    }
 50}
 51#endif
 52
 53static void dct_unquantize_h263_intra_armv5te(MpegEncContext *s,
 54                                  int16_t *block, int n, int qscale)
 55{
 56    int level, qmul, qadd;
 57    int nCoeffs;
 58
 59    av_assert2(s->block_last_index[n]>=0);
 60
 61    qmul = qscale << 1;
 62
 63    if (!s->h263_aic) {
 64        if (n < 4)
 65            level = block[0] * s->y_dc_scale;
 66        else
 67            level = block[0] * s->c_dc_scale;
 68        qadd = (qscale - 1) | 1;
 69    }else{
 70        qadd = 0;
 71        level = block[0];
 72    }
 73    if(s->ac_pred)
 74        nCoeffs=63;
 75    else
 76        nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
 77
 78    ff_dct_unquantize_h263_armv5te(block, qmul, qadd, nCoeffs + 1);
 79    block[0] = level;
 80}
 81
 82static void dct_unquantize_h263_inter_armv5te(MpegEncContext *s,
 83                                  int16_t *block, int n, int qscale)
 84{
 85    int qmul, qadd;
 86    int nCoeffs;
 87
 88    av_assert2(s->block_last_index[n]>=0);
 89
 90    qadd = (qscale - 1) | 1;
 91    qmul = qscale << 1;
 92
 93    nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
 94
 95    ff_dct_unquantize_h263_armv5te(block, qmul, qadd, nCoeffs + 1);
 96}
 97
 98av_cold void ff_mpv_common_init_armv5te(MpegEncContext *s)
 99{
100    s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_armv5te;
101    s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_armv5te;
102}