mirror of
https://github.com/librempeg/librempeg
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64 lines
2.2 KiB
C
64 lines
2.2 KiB
C
/*
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* Apple ProRes compatible decoder
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*
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* Copyright (c) 2010-2011 Maxim Poliakovski
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "proresdsp.h"
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#include "simple_idct.h"
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#define BIAS (1 << (PRORES_BITS_PER_SAMPLE - 1)) ///< bias value for converting signed pixels into unsigned ones
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#define CLIP_MIN (1 << (PRORES_BITS_PER_SAMPLE - 8)) ///< minimum value for clipping resulting pixels
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#define CLIP_MAX (1 << PRORES_BITS_PER_SAMPLE) - CLIP_MIN - 1 ///< maximum value for clipping resulting pixels
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#define CLIP_AND_BIAS(x) (av_clip((x) + BIAS, CLIP_MIN, CLIP_MAX))
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/**
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* Add bias value, clamp and output pixels of a slice
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*/
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static void put_pixels(uint16_t *dst, int stride, const DCTELEM *in)
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{
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int x, y, src_offset, dst_offset;
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for (y = 0, dst_offset = 0; y < 8; y++, dst_offset += stride) {
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for (x = 0; x < 8; x++) {
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src_offset = (y << 3) + x;
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dst[dst_offset + x] = CLIP_AND_BIAS(in[src_offset]);
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}
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}
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}
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static void prores_idct_put_c(uint16_t *out, int linesize, DCTELEM *block, const int16_t *qmat)
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{
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ff_prores_idct(block, qmat);
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put_pixels(out, linesize >> 1, block);
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}
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void ff_proresdsp_init(ProresDSPContext *dsp, AVCodecContext *avctx)
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{
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dsp->idct_put = prores_idct_put_c;
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dsp->idct_permutation_type = FF_NO_IDCT_PERM;
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if (HAVE_MMX) ff_proresdsp_x86_init(dsp, avctx);
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ff_init_scantable_permutation(dsp->idct_permutation,
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dsp->idct_permutation_type);
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}
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