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  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.  */
  39. static 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.  
  52. static 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.  
  58. av_cold void ff_proresdsp_init(ProresDSPContext *dsp, AVCodecContext *avctx)
  59. {
  60.     dsp->idct_put = prores_idct_put_c;
  61.     dsp->idct_permutation_type = FF_IDCT_PERM_NONE;
  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.