2 * Apple ProRes compatible decoder
4 * Copyright (c) 2010-2011 Maxim Poliakovski
6 * This file is part of Libav.
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.
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.
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
23 #include "proresdsp.h"
24 #include "simple_idct.h"
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
30 #define CLIP_AND_BIAS(x) (av_clip((x) + BIAS, CLIP_MIN, CLIP_MAX))
33 * Add bias value, clamp and output pixels of a slice
35 static void put_pixels(uint16_t *dst, int stride, const DCTELEM *in)
37 int x, y, src_offset, dst_offset;
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;
43 dst[dst_offset + x] = CLIP_AND_BIAS(in[src_offset]);
48 static void prores_idct_put_c(uint16_t *out, int linesize, DCTELEM *block, const int16_t *qmat)
50 ff_prores_idct(block, qmat);
51 put_pixels(out, linesize >> 1, block);
54 static void prores_fdct_c(const uint16_t *src, int linesize, DCTELEM *block)
57 const uint16_t *tsrc = src;
59 for (y = 0; y < 8; y++) {
60 for (x = 0; x < 8; x++)
61 block[y * 8 + x] = tsrc[x];
62 tsrc += linesize >> 1;
64 ff_jpeg_fdct_islow_10(block);
67 void ff_proresdsp_init(ProresDSPContext *dsp, AVCodecContext *avctx)
69 dsp->idct_put = prores_idct_put_c;
70 dsp->idct_permutation_type = FF_NO_IDCT_PERM;
71 dsp->fdct = prores_fdct_c;
72 dsp->dct_permutation_type = FF_NO_IDCT_PERM;
74 if (HAVE_MMX) ff_proresdsp_x86_init(dsp, avctx);
76 ff_init_scantable_permutation(dsp->idct_permutation,
77 dsp->idct_permutation_type);
78 ff_init_scantable_permutation(dsp->dct_permutation,
79 dsp->dct_permutation_type);