1/* 2 * Apple ProRes compatible decoder 3 * 4 * Copyright (c) 2010-2011 Maxim Poliakovski 5 * 6 * This file is part of FFmpeg. 7 * 8 * FFmpeg 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 * FFmpeg 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 FFmpeg; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 21 */ 22 23#include "config.h" 24#include "libavutil/attributes.h" 25#include "libavutil/common.h" 26#include "idctdsp.h" 27#include "proresdsp.h" 28#include "simple_idct.h" 29 30#define BIAS (1 << (PRORES_BITS_PER_SAMPLE - 1)) ///< bias value for converting signed pixels into unsigned ones 31#define CLIP_MIN (1 << (PRORES_BITS_PER_SAMPLE - 8)) ///< minimum value for clipping resulting pixels 32#define CLIP_MAX (1 << PRORES_BITS_PER_SAMPLE) - CLIP_MIN - 1 ///< maximum value for clipping resulting pixels 33 34#define CLIP(x) (av_clip((x), CLIP_MIN, CLIP_MAX)) 35 36/** 37 * Add bias value, clamp and output pixels of a slice 38 */ 39static void put_pixels(uint16_t *dst, int stride, const int16_t *in) 40{ 41 int x, y, src_offset, dst_offset; 42 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; 46 47 dst[dst_offset + x] = CLIP(in[src_offset]); 48 } 49 } 50} 51 52static void prores_idct_put_c(uint16_t *out, int linesize, int16_t *block, const int16_t *qmat) 53{ 54 ff_prores_idct(block, qmat); 55 put_pixels(out, linesize >> 1, block); 56} 57 58av_cold void ff_proresdsp_init(ProresDSPContext *dsp, AVCodecContext *avctx) 59{ 60 dsp->idct_put = prores_idct_put_c; 61 dsp->idct_permutation_type = FF_NO_IDCT_PERM; 62 63 if (ARCH_X86) 64 ff_proresdsp_init_x86(dsp, avctx); 65 66 ff_init_scantable_permutation(dsp->idct_permutation, 67 dsp->idct_permutation_type); 68} 69