ffmpeg/libavcodec/proresdsp.c

   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 }