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/*
* Apple ProRes compatible decoder
*
* Copyright (c) 2010-2011 Maxim Poliakovski
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "proresdsp.h"
#include "simple_idct.h"
#define BIAS (1 << (PRORES_BITS_PER_SAMPLE - 1)) ///< bias value for converting signed pixels into unsigned ones
#define CLIP_MIN (1 << (PRORES_BITS_PER_SAMPLE - 8)) ///< minimum value for clipping resulting pixels
#define CLIP_MAX (1 << PRORES_BITS_PER_SAMPLE) - CLIP_MIN - 1 ///< maximum value for clipping resulting pixels
#define CLIP_AND_BIAS(x) (av_clip((x) + BIAS, CLIP_MIN, CLIP_MAX))
/**
* Add bias value, clamp and output pixels of a slice
*/
static void put_pixels(uint16_t *dst, int stride, const DCTELEM *in)
{
int x, y, src_offset, dst_offset;
for (y = 0, dst_offset = 0; y < 8; y++, dst_offset += stride) {
for (x = 0; x < 8; x++) {
src_offset = (y << 3) + x;
dst[dst_offset + x] = CLIP_AND_BIAS(in[src_offset]);
}
}
}
static void prores_idct_put_c(uint16_t *out, int linesize, DCTELEM *block, const int16_t *qmat)
{
ff_prores_idct(block, qmat);
put_pixels(out, linesize >> 1, block);
}
static void prores_fdct_c(const uint16_t *src, int linesize, DCTELEM *block)
{
int x, y;
const uint16_t *tsrc = src;
for (y = 0; y < 8; y++) {
for (x = 0; x < 8; x++)
block[y * 8 + x] = tsrc[x];
tsrc += linesize >> 1;
}
ff_jpeg_fdct_islow_10(block);
}
void ff_proresdsp_init(ProresDSPContext *dsp)
{
dsp->idct_put = prores_idct_put_c;
dsp->idct_permutation_type = FF_NO_IDCT_PERM;
dsp->fdct = prores_fdct_c;
dsp->dct_permutation_type = FF_NO_IDCT_PERM;
if (HAVE_MMX) ff_proresdsp_x86_init(dsp);
ff_init_scantable_permutation(dsp->idct_permutation,
dsp->idct_permutation_type);
ff_init_scantable_permutation(dsp->dct_permutation,
dsp->dct_permutation_type);
}
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