1/*
2 * Apple ProRes compatible decoder
3 *
4 * Copyright (c) 2010-2011 Maxim Poliakovski
5 *
6 * This file is part of Libav.
7 *
8 * Libav is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * Libav is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23#include "proresdsp.h"
24#include "simple_idct.h"
25
26#define BIAS     (1 << (PRORES_BITS_PER_SAMPLE - 1))           ///< bias value for converting signed pixels into unsigned ones
27#define CLIP_MIN (1 << (PRORES_BITS_PER_SAMPLE - 8))           ///< minimum value for clipping resulting pixels
28#define CLIP_MAX (1 << PRORES_BITS_PER_SAMPLE) - CLIP_MIN - 1  ///< maximum value for clipping resulting pixels
29
30#define CLIP_AND_BIAS(x) (av_clip((x) + BIAS, CLIP_MIN, CLIP_MAX))
31
32/**
33 * Add bias value, clamp and output pixels of a slice
34 */
35static void put_pixels(uint16_t *dst, int stride, const DCTELEM *in)
36{
37    int x, y, src_offset, dst_offset;
38
39    for (y = 0, dst_offset = 0; y < 8; y++, dst_offset += stride) {
40        for (x = 0; x < 8; x++) {
41            src_offset = (y << 3) + x;
42
43            dst[dst_offset + x] = CLIP_AND_BIAS(in[src_offset]);
44        }
45    }
46}
47
48static void prores_idct_put_c(uint16_t *out, int linesize, DCTELEM *block, const int16_t *qmat)
49{
50    ff_prores_idct(block, qmat);
51    put_pixels(out, linesize >> 1, block);
52}
53
54void ff_proresdsp_init(ProresDSPContext *dsp)
55{
56    dsp->idct_put = prores_idct_put_c;
57    dsp->idct_permutation_type = FF_NO_IDCT_PERM;
58
59    if (HAVE_MMX) ff_proresdsp_x86_init(dsp);
60
61    ff_init_scantable_permutation(dsp->idct_permutation,
62                                  dsp->idct_permutation_type);
63}
64