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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 "libavutil/attributes.h"
  24. #include "libavutil/common.h"
  25. #include "dct.h"
  26. #include "dsputil.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_AND_BIAS(x) (av_clip((x) + BIAS, CLIP_MIN, CLIP_MAX))
  35.  
  36. #if CONFIG_PRORES_DECODER | CONFIG_PRORES_LGPL_DECODER
  37. /**
  38.  * Add bias value, clamp and output pixels of a slice
  39.  */
  40. static void put_pixels(uint16_t *dst, int stride, const int16_t *in)
  41. {
  42.     int x, y, src_offset, dst_offset;
  43.  
  44.     for (y = 0, dst_offset = 0; y < 8; y++, dst_offset += stride) {
  45.         for (x = 0; x < 8; x++) {
  46.             src_offset = (y << 3) + x;
  47.  
  48.             dst[dst_offset + x] = CLIP_AND_BIAS(in[src_offset]);
  49.         }
  50.     }
  51. }
  52.  
  53. static void prores_idct_put_c(uint16_t *out, int linesize, int16_t *block, const int16_t *qmat)
  54. {
  55.     ff_prores_idct(block, qmat);
  56.     put_pixels(out, linesize >> 1, block);
  57. }
  58. #endif
  59.  
  60. #if CONFIG_PRORES_KS_ENCODER
  61. static void prores_fdct_c(const uint16_t *src, int linesize, int16_t *block)
  62. {
  63.     int x, y;
  64.     const uint16_t *tsrc = src;
  65.  
  66.     for (y = 0; y < 8; y++) {
  67.         for (x = 0; x < 8; x++)
  68.             block[y * 8 + x] = tsrc[x];
  69.         tsrc += linesize >> 1;
  70.     }
  71.     ff_jpeg_fdct_islow_10(block);
  72. }
  73. #endif
  74.  
  75. av_cold void ff_proresdsp_init(ProresDSPContext *dsp, AVCodecContext *avctx)
  76. {
  77. #if CONFIG_PRORES_DECODER | CONFIG_PRORES_LGPL_DECODER
  78.     dsp->idct_put = prores_idct_put_c;
  79.     dsp->idct_permutation_type = FF_NO_IDCT_PERM;
  80.  
  81.     if (ARCH_X86) ff_proresdsp_x86_init(dsp, avctx);
  82.  
  83.     ff_init_scantable_permutation(dsp->idct_permutation,
  84.                                   dsp->idct_permutation_type);
  85. #endif
  86. #if CONFIG_PRORES_KS_ENCODER
  87.     dsp->fdct                 = prores_fdct_c;
  88.     dsp->dct_permutation_type = FF_NO_IDCT_PERM;
  89.     ff_init_scantable_permutation(dsp->dct_permutation,
  90.                                   dsp->dct_permutation_type);
  91. #endif
  92. }
  93.