audioconvert.h 4.2 KB

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  1. /*
  2. * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
  3. * Copyright (c) 2008 Peter Ross
  4. *
  5. * This file is part of FFmpeg.
  6. *
  7. * FFmpeg is free software; you can redistribute it and/or
  8. * modify it under the terms of the GNU Lesser General Public
  9. * License as published by the Free Software Foundation; either
  10. * version 2.1 of the License, or (at your option) any later version.
  11. *
  12. * FFmpeg is distributed in the hope that it will be useful,
  13. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15. * Lesser General Public License for more details.
  16. *
  17. * You should have received a copy of the GNU Lesser General Public
  18. * License along with FFmpeg; if not, write to the Free Software
  19. * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20. */
  21. #ifndef AVUTIL_AUDIOCONVERT_H
  22. #define AVUTIL_AUDIOCONVERT_H
  23. #include <stdint.h>
  24. /**
  25. * @file
  26. * audio conversion routines
  27. */
  28. /* Audio channel masks */
  29. #define AV_CH_FRONT_LEFT 0x00000001
  30. #define AV_CH_FRONT_RIGHT 0x00000002
  31. #define AV_CH_FRONT_CENTER 0x00000004
  32. #define AV_CH_LOW_FREQUENCY 0x00000008
  33. #define AV_CH_BACK_LEFT 0x00000010
  34. #define AV_CH_BACK_RIGHT 0x00000020
  35. #define AV_CH_FRONT_LEFT_OF_CENTER 0x00000040
  36. #define AV_CH_FRONT_RIGHT_OF_CENTER 0x00000080
  37. #define AV_CH_BACK_CENTER 0x00000100
  38. #define AV_CH_SIDE_LEFT 0x00000200
  39. #define AV_CH_SIDE_RIGHT 0x00000400
  40. #define AV_CH_TOP_CENTER 0x00000800
  41. #define AV_CH_TOP_FRONT_LEFT 0x00001000
  42. #define AV_CH_TOP_FRONT_CENTER 0x00002000
  43. #define AV_CH_TOP_FRONT_RIGHT 0x00004000
  44. #define AV_CH_TOP_BACK_LEFT 0x00008000
  45. #define AV_CH_TOP_BACK_CENTER 0x00010000
  46. #define AV_CH_TOP_BACK_RIGHT 0x00020000
  47. #define AV_CH_STEREO_LEFT 0x20000000 ///< Stereo downmix.
  48. #define AV_CH_STEREO_RIGHT 0x40000000 ///< See AV_CH_STEREO_LEFT.
  49. /** Channel mask value used for AVCodecContext.request_channel_layout
  50. to indicate that the user requests the channel order of the decoder output
  51. to be the native codec channel order. */
  52. #define AV_CH_LAYOUT_NATIVE 0x8000000000000000LL
  53. /* Audio channel convenience macros */
  54. #define AV_CH_LAYOUT_MONO (AV_CH_FRONT_CENTER)
  55. #define AV_CH_LAYOUT_STEREO (AV_CH_FRONT_LEFT|AV_CH_FRONT_RIGHT)
  56. #define AV_CH_LAYOUT_2_1 (AV_CH_LAYOUT_STEREO|AV_CH_BACK_CENTER)
  57. #define AV_CH_LAYOUT_SURROUND (AV_CH_LAYOUT_STEREO|AV_CH_FRONT_CENTER)
  58. #define AV_CH_LAYOUT_4POINT0 (AV_CH_LAYOUT_SURROUND|AV_CH_BACK_CENTER)
  59. #define AV_CH_LAYOUT_2_2 (AV_CH_LAYOUT_STEREO|AV_CH_SIDE_LEFT|AV_CH_SIDE_RIGHT)
  60. #define AV_CH_LAYOUT_QUAD (AV_CH_LAYOUT_STEREO|AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT)
  61. #define AV_CH_LAYOUT_5POINT0 (AV_CH_LAYOUT_SURROUND|AV_CH_SIDE_LEFT|AV_CH_SIDE_RIGHT)
  62. #define AV_CH_LAYOUT_5POINT1 (AV_CH_LAYOUT_5POINT0|AV_CH_LOW_FREQUENCY)
  63. #define AV_CH_LAYOUT_5POINT0_BACK (AV_CH_LAYOUT_SURROUND|AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT)
  64. #define AV_CH_LAYOUT_5POINT1_BACK (AV_CH_LAYOUT_5POINT0_BACK|AV_CH_LOW_FREQUENCY)
  65. #define AV_CH_LAYOUT_7POINT0 (AV_CH_LAYOUT_5POINT0|AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT)
  66. #define AV_CH_LAYOUT_7POINT1 (AV_CH_LAYOUT_5POINT1|AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT)
  67. #define AV_CH_LAYOUT_7POINT1_WIDE (AV_CH_LAYOUT_5POINT1_BACK|AV_CH_FRONT_LEFT_OF_CENTER|AV_CH_FRONT_RIGHT_OF_CENTER)
  68. #define AV_CH_LAYOUT_STEREO_DOWNMIX (AV_CH_STEREO_LEFT|AV_CH_STEREO_RIGHT)
  69. /**
  70. * Return a channel layout id that matches name, 0 if no match.
  71. */
  72. int64_t av_get_channel_layout(const char *name);
  73. /**
  74. * Return a description of a channel layout.
  75. * If nb_channels is <= 0, it is guessed from the channel_layout.
  76. *
  77. * @param buf put here the string containing the channel layout
  78. * @param buf_size size in bytes of the buffer
  79. */
  80. void av_get_channel_layout_string(char *buf, int buf_size, int nb_channels, int64_t channel_layout);
  81. /**
  82. * Return the number of channels in the channel layout.
  83. */
  84. int av_get_channel_layout_nb_channels(int64_t channel_layout);
  85. #endif /* AVUTIL_AUDIOCONVERT_H */