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ffmpeg-4.2.2/libavcodec/mpegvideodata.c 4.09 KB
aac5773f   hucm   功能基本完成,接口待打磨
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  /*
   * This file is part of FFmpeg.
   *
   * FFmpeg is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * FFmpeg is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with FFmpeg; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   */
  
  #include <stdint.h>
  
  const uint8_t ff_default_chroma_qscale_table[32] = {
  //   0   1   2   3   4   5   6   7   8   9  10  11  12  13  14  15
       0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
      16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31
  };
  
  const uint8_t ff_mpeg2_non_linear_qscale[32] = {
       0,  1,  2,  3,  4,  5,   6,   7,
       8, 10, 12, 14, 16, 18,  20,  22,
      24, 28, 32, 36, 40, 44,  48,  52,
      56, 64, 72, 80, 88, 96, 104, 112,
  };
  
  const uint8_t ff_mpeg1_dc_scale_table[128] = {
  //  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15
      8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
      8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
      8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
      8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
      8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
      8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
      8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
      8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
  };
  
  static const uint8_t mpeg2_dc_scale_table1[128] = {
  //  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15
      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
  };
  
  static const uint8_t mpeg2_dc_scale_table2[128] = {
  //  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15
      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  };
  
  static const uint8_t mpeg2_dc_scale_table3[128] = {
  //  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15
      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  };
  
  const uint8_t *const ff_mpeg2_dc_scale_table[4] = {
      ff_mpeg1_dc_scale_table,
      mpeg2_dc_scale_table1,
      mpeg2_dc_scale_table2,
      mpeg2_dc_scale_table3,
  };
  
  const uint8_t ff_alternate_horizontal_scan[64] = {
       0,  1,  2,  3,  8,  9, 16, 17,
      10, 11,  4,  5,  6,  7, 15, 14,
      13, 12, 19, 18, 24, 25, 32, 33,
      26, 27, 20, 21, 22, 23, 28, 29,
      30, 31, 34, 35, 40, 41, 48, 49,
      42, 43, 36, 37, 38, 39, 44, 45,
      46, 47, 50, 51, 56, 57, 58, 59,
      52, 53, 54, 55, 60, 61, 62, 63,
  };
  
  const uint8_t ff_alternate_vertical_scan[64] = {
       0,  8, 16, 24,  1,  9,  2, 10,
      17, 25, 32, 40, 48, 56, 57, 49,
      41, 33, 26, 18,  3, 11,  4, 12,
      19, 27, 34, 42, 50, 58, 35, 43,
      51, 59, 20, 28,  5, 13,  6, 14,
      21, 29, 36, 44, 52, 60, 37, 45,
      53, 61, 22, 30,  7, 15, 23, 31,
      38, 46, 54, 62, 39, 47, 55, 63,
  };