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
25 #include "proresdsp.h"
26 #include "simple_idct.h"
27 #include "libavutil/common.h"
29 #define BIAS (1 << (PRORES_BITS_PER_SAMPLE - 1)) ///< bias value for converting signed pixels into unsigned ones
30 #define CLIP_MIN (1 << (PRORES_BITS_PER_SAMPLE - 8)) ///< minimum value for clipping resulting pixels
31 #define CLIP_MAX (1 << PRORES_BITS_PER_SAMPLE) - CLIP_MIN - 1 ///< maximum value for clipping resulting pixels
33 #define CLIP_AND_BIAS(x) (av_clip((x) + BIAS, CLIP_MIN, CLIP_MAX))
35 #if CONFIG_PRORES_DECODER | CONFIG_PRORES_LGPL_DECODER
37 * Add bias value, clamp and output pixels of a slice
39 static void put_pixels(uint16_t *dst, int stride, const int16_t *in)
41 int x, y, src_offset, dst_offset;
43 for (y = 0, dst_offset = 0; y < 8; y++, dst_offset += stride) {
44 for (x = 0; x < 8; x++) {
45 src_offset = (y << 3) + x;
47 dst[dst_offset + x] = CLIP_AND_BIAS(in[src_offset]);
52 static void prores_idct_put_c(uint16_t *out, int linesize, int16_t *block, const int16_t *qmat)
54 ff_prores_idct(block, qmat);
55 put_pixels(out, linesize >> 1, block);
59 #if CONFIG_PRORES_KOSTYA_ENCODER
60 static void prores_fdct_c(const uint16_t *src, int linesize, int16_t *block)
63 const uint16_t *tsrc = src;
65 for (y = 0; y < 8; y++) {
66 for (x = 0; x < 8; x++)
67 block[y * 8 + x] = tsrc[x];
68 tsrc += linesize >> 1;
70 ff_jpeg_fdct_islow_10(block);
74 void ff_proresdsp_init(ProresDSPContext *dsp, AVCodecContext *avctx)
76 #if CONFIG_PRORES_DECODER | CONFIG_PRORES_LGPL_DECODER
77 dsp->idct_put = prores_idct_put_c;
78 dsp->idct_permutation_type = FF_NO_IDCT_PERM;
80 if (ARCH_X86) ff_proresdsp_x86_init(dsp, avctx);
82 ff_init_scantable_permutation(dsp->idct_permutation,
83 dsp->idct_permutation_type);
85 #if CONFIG_PRORES_KOSTYA_ENCODER
86 dsp->fdct = prores_fdct_c;
87 dsp->dct_permutation_type = FF_NO_IDCT_PERM;
88 ff_init_scantable_permutation(dsp->dct_permutation,
89 dsp->dct_permutation_type);