proresdsp.c 2.27 KB
Newer Older
1 2 3 4 5
/*
 * Apple ProRes compatible decoder
 *
 * Copyright (c) 2010-2011 Maxim Poliakovski
 *
6
 * This file is part of FFmpeg.
7
 *
8
 * FFmpeg is free software; you can redistribute it and/or
9 10 11 12
 * 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.
 *
13
 * FFmpeg is distributed in the hope that it will be useful,
14 15 16 17 18
 * 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
19
 * License along with FFmpeg; if not, write to the Free Software
20 21 22
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

23
#include "config.h"
24 25
#include "libavutil/attributes.h"
#include "libavutil/common.h"
26
#include "idctdsp.h"
27 28 29 30 31 32 33
#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

34
#define CLIP(x) (av_clip((x), CLIP_MIN, CLIP_MAX))
35 36 37 38

/**
 * Add bias value, clamp and output pixels of a slice
 */
Diego Biurrun's avatar
Diego Biurrun committed
39
static void put_pixels(uint16_t *dst, int stride, const int16_t *in)
40 41 42 43 44 45 46
{
    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;

47
            dst[dst_offset + x] = CLIP(in[src_offset]);
48 49 50 51
        }
    }
}

Diego Biurrun's avatar
Diego Biurrun committed
52
static void prores_idct_put_c(uint16_t *out, int linesize, int16_t *block, const int16_t *qmat)
53 54 55 56
{
    ff_prores_idct(block, qmat);
    put_pixels(out, linesize >> 1, block);
}
Kostya Shishkov's avatar
Kostya Shishkov committed
57

58
av_cold void ff_proresdsp_init(ProresDSPContext *dsp, AVCodecContext *avctx)
59 60
{
    dsp->idct_put = prores_idct_put_c;
61
    dsp->idct_permutation_type = FF_IDCT_PERM_NONE;
62

63
    if (ARCH_X86)
64
        ff_proresdsp_init_x86(dsp, avctx);
65

66 67 68
    ff_init_scantable_permutation(dsp->idct_permutation,
                                  dsp->idct_permutation_type);
}