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/*
* Unquantize functions for mpegvideo
* Copyright (c) 2000,2001 Fabrice Bellard
* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
*
* 4MV & hq & B-frame encoding stuff by Michael Niedermayer <michaelni@gmx.at>
*
* 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 <stdint.h>
#include "config.h"
#include "libavutil/attributes.h"
#include "libavutil/avassert.h"
#include "avcodec.h"
#include "mpegvideo.h"
#include "mpegvideodata.h"
#include "mpegvideo_unquantize.h"
static void dct_unquantize_mpeg1_intra_c(MpegEncContext *s,
int16_t *block, int n, int qscale)
{
int i, level, nCoeffs;
const uint16_t *quant_matrix;
nCoeffs= s->block_last_index[n];
block[0] *= n < 4 ? s->y_dc_scale : s->c_dc_scale;
/* XXX: only MPEG-1 */
quant_matrix = s->intra_matrix;
for(i=1;i<=nCoeffs;i++) {
int j= s->intra_scantable.permutated[i];
level = block[j];
if (level) {
if (level < 0) {
level = -level;
level = (int)(level * qscale * quant_matrix[j]) >> 3;
level = (level - 1) | 1;
level = -level;
} else {
level = (int)(level * qscale * quant_matrix[j]) >> 3;
level = (level - 1) | 1;
}
block[j] = level;
}
}
}
static void dct_unquantize_mpeg1_inter_c(MpegEncContext *s,
int16_t *block, int n, int qscale)
{
int i, level, nCoeffs;
const uint16_t *quant_matrix;
nCoeffs= s->block_last_index[n];
quant_matrix = s->inter_matrix;
for(i=0; i<=nCoeffs; i++) {
int j= s->intra_scantable.permutated[i];
level = block[j];
if (level) {
if (level < 0) {
level = -level;
level = (((level << 1) + 1) * qscale *
((int) (quant_matrix[j]))) >> 4;
level = (level - 1) | 1;
level = -level;
} else {
level = (((level << 1) + 1) * qscale *
((int) (quant_matrix[j]))) >> 4;
level = (level - 1) | 1;
}
block[j] = level;
}
}
}
static void dct_unquantize_mpeg2_intra_c(MpegEncContext *s,
int16_t *block, int n, int qscale)
{
int i, level, nCoeffs;
const uint16_t *quant_matrix;
if (s->q_scale_type) qscale = ff_mpeg2_non_linear_qscale[qscale];
else qscale <<= 1;
nCoeffs= s->block_last_index[n];
block[0] *= n < 4 ? s->y_dc_scale : s->c_dc_scale;
quant_matrix = s->intra_matrix;
for(i=1;i<=nCoeffs;i++) {
int j= s->intra_scantable.permutated[i];
level = block[j];
if (level) {
if (level < 0) {
level = -level;
level = (int)(level * qscale * quant_matrix[j]) >> 4;
level = -level;
} else {
level = (int)(level * qscale * quant_matrix[j]) >> 4;
}
block[j] = level;
}
}
}
static void dct_unquantize_mpeg2_intra_bitexact(MpegEncContext *s,
int16_t *block, int n, int qscale)
{
int i, level, nCoeffs;
const uint16_t *quant_matrix;
int sum=-1;
if (s->q_scale_type) qscale = ff_mpeg2_non_linear_qscale[qscale];
else qscale <<= 1;
nCoeffs= s->block_last_index[n];
block[0] *= n < 4 ? s->y_dc_scale : s->c_dc_scale;
sum += block[0];
quant_matrix = s->intra_matrix;
for(i=1;i<=nCoeffs;i++) {
int j= s->intra_scantable.permutated[i];
level = block[j];
if (level) {
if (level < 0) {
level = -level;
level = (int)(level * qscale * quant_matrix[j]) >> 4;
level = -level;
} else {
level = (int)(level * qscale * quant_matrix[j]) >> 4;
}
block[j] = level;
sum+=level;
}
}
block[63]^=sum&1;
}
static void dct_unquantize_mpeg2_inter_c(MpegEncContext *s,
int16_t *block, int n, int qscale)
{
int i, level, nCoeffs;
const uint16_t *quant_matrix;
int sum=-1;
if (s->q_scale_type) qscale = ff_mpeg2_non_linear_qscale[qscale];
else qscale <<= 1;
nCoeffs= s->block_last_index[n];
quant_matrix = s->inter_matrix;
for(i=0; i<=nCoeffs; i++) {
int j= s->intra_scantable.permutated[i];
level = block[j];
if (level) {
if (level < 0) {
level = -level;
level = (((level << 1) + 1) * qscale *
((int) (quant_matrix[j]))) >> 5;
level = -level;
} else {
level = (((level << 1) + 1) * qscale *
((int) (quant_matrix[j]))) >> 5;
}
block[j] = level;
sum+=level;
}
}
block[63]^=sum&1;
}
static void dct_unquantize_h263_intra_c(MpegEncContext *s,
int16_t *block, int n, int qscale)
{
int i, level, qmul, qadd;
int nCoeffs;
av_assert2(s->block_last_index[n]>=0 || s->h263_aic);
qmul = qscale << 1;
if (!s->h263_aic) {
block[0] *= n < 4 ? s->y_dc_scale : s->c_dc_scale;
qadd = (qscale - 1) | 1;
}else{
qadd = 0;
}
if(s->ac_pred)
nCoeffs=63;
else
nCoeffs= s->intra_scantable.raster_end[ s->block_last_index[n] ];
for(i=1; i<=nCoeffs; i++) {
level = block[i];
if (level) {
if (level < 0) {
level = level * qmul - qadd;
} else {
level = level * qmul + qadd;
}
block[i] = level;
}
}
}
static void dct_unquantize_h263_inter_c(MpegEncContext *s,
int16_t *block, int n, int qscale)
{
int i, level, 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] ];
for(i=0; i<=nCoeffs; i++) {
level = block[i];
if (level) {
if (level < 0) {
level = level * qmul - qadd;
} else {
level = level * qmul + qadd;
}
block[i] = level;
}
}
}
av_cold void ff_mpv_unquantize_init(MPVUnquantDSPContext *s,
int bitexact, int q_scale_type)
{
s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_c;
s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_c;
s->dct_unquantize_mpeg1_intra = dct_unquantize_mpeg1_intra_c;
s->dct_unquantize_mpeg1_inter = dct_unquantize_mpeg1_inter_c;
s->dct_unquantize_mpeg2_intra = dct_unquantize_mpeg2_intra_c;
if (bitexact)
s->dct_unquantize_mpeg2_intra = dct_unquantize_mpeg2_intra_bitexact;
s->dct_unquantize_mpeg2_inter = dct_unquantize_mpeg2_inter_c;
#if HAVE_INTRINSICS_NEON
ff_mpv_unquantize_init_neon(s, bitexact);
#endif
#if ARCH_ARM
ff_mpv_unquantize_init_arm(s, bitexact);
#elif ARCH_PPC
ff_mpv_unquantize_init_ppc(s, bitexact);
#elif ARCH_X86
ff_mpv_unquantize_init_x86(s, bitexact);
#elif ARCH_MIPS
ff_mpv_unquantize_init_mips(s, bitexact, q_scale_type);
#endif
}
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