aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* 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 "libavutil/attributes.h"
#include "libavutil/avassert.h"
#include "libavcodec/avcodec.h"
#include "libavcodec/mpegvideo.h"
#include "mpegvideo_arm.h"
void ff_dct_unquantize_h263_armv5te(int16_t *block, int qmul, int qadd, int count);
#ifdef ENABLE_ARM_TESTS
/**
* H.263 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(int16_t *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,
int16_t *block, int n, int qscale)
{
int level, qmul, qadd;
int nCoeffs;
av_assert2(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,
int16_t *block, int n, int qscale)
{
int qmul, qadd;
int nCoeffs;
av_assert2(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);
}
av_cold void ff_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;
}
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