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