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  1. /*
  2.  * copyright (c) 2001 Fabrice Bellard
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. /**
  22.  * @file
  23.  * mpeg audio declarations for both encoder and decoder.
  24.  */
  25.  
  26. #ifndef AVCODEC_MPEGAUDIO_H
  27. #define AVCODEC_MPEGAUDIO_H
  28.  
  29. #ifndef CONFIG_FLOAT
  30. #   define CONFIG_FLOAT 0
  31. #endif
  32.  
  33. #include <stdint.h>
  34.  
  35. /* max frame size, in samples */
  36. #define MPA_FRAME_SIZE 1152
  37.  
  38. /* max compressed frame size */
  39. #define MPA_MAX_CODED_FRAME_SIZE 1792
  40.  
  41. #define MPA_MAX_CHANNELS 2
  42.  
  43. #define SBLIMIT 32 /* number of subbands */
  44.  
  45. #define MPA_STEREO  0
  46. #define MPA_JSTEREO 1
  47. #define MPA_DUAL    2
  48. #define MPA_MONO    3
  49.  
  50. #ifndef FRAC_BITS
  51. #define FRAC_BITS   23   /* fractional bits for sb_samples and dct */
  52. #define WFRAC_BITS  16   /* fractional bits for window */
  53. #endif
  54.  
  55. #define IMDCT_SCALAR 1.759
  56.  
  57. #define FRAC_ONE    (1 << FRAC_BITS)
  58.  
  59. #define FIX(a)   ((int)((a) * FRAC_ONE))
  60.  
  61. #if CONFIG_FLOAT
  62. #   define INTFLOAT float
  63. typedef float MPA_INT;
  64. typedef float OUT_INT;
  65. #elif FRAC_BITS <= 15
  66. #   define INTFLOAT int
  67. typedef int16_t MPA_INT;
  68. typedef int16_t OUT_INT;
  69. #else
  70. #   define INTFLOAT int
  71. typedef int32_t MPA_INT;
  72. typedef int16_t OUT_INT;
  73. #endif
  74.  
  75. int ff_mpa_l2_select_table(int bitrate, int nb_channels, int freq, int lsf);
  76.  
  77. #endif /* AVCODEC_MPEGAUDIO_H */
  78.