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FFmpeg/libavutil/audioconvert.h

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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 Libav.

  6.  *

  7.  * Libav 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.  * Libav 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 Libav; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. 

  22. #ifndef AVUTIL_AUDIOCONVERT_H

  23. #define AVUTIL_AUDIOCONVERT_H

  24. 

  25. #include <stdint.h>

  26. 

  27. /**

  28.  * @file

  29.  * audio conversion routines

  30.  */

  31. 

  32. /**

  33.  * @addtogroup lavu_audio

  34.  * @{

  35.  */

  36. 

  37. /**

  38.  * @defgroup channel_masks Audio channel masks

  39.  * @{

  40.  */

  41. #define AV_CH_FRONT_LEFT             0x00000001

  42. #define AV_CH_FRONT_RIGHT            0x00000002

  43. #define AV_CH_FRONT_CENTER           0x00000004

  44. #define AV_CH_LOW_FREQUENCY          0x00000008

  45. #define AV_CH_BACK_LEFT              0x00000010

  46. #define AV_CH_BACK_RIGHT             0x00000020

  47. #define AV_CH_FRONT_LEFT_OF_CENTER   0x00000040

  48. #define AV_CH_FRONT_RIGHT_OF_CENTER  0x00000080

  49. #define AV_CH_BACK_CENTER            0x00000100

  50. #define AV_CH_SIDE_LEFT              0x00000200

  51. #define AV_CH_SIDE_RIGHT             0x00000400

  52. #define AV_CH_TOP_CENTER             0x00000800

  53. #define AV_CH_TOP_FRONT_LEFT         0x00001000

  54. #define AV_CH_TOP_FRONT_CENTER       0x00002000

  55. #define AV_CH_TOP_FRONT_RIGHT        0x00004000

  56. #define AV_CH_TOP_BACK_LEFT          0x00008000

  57. #define AV_CH_TOP_BACK_CENTER        0x00010000

  58. #define AV_CH_TOP_BACK_RIGHT         0x00020000

  59. #define AV_CH_STEREO_LEFT            0x20000000  ///< Stereo downmix.

  60. #define AV_CH_STEREO_RIGHT           0x40000000  ///< See AV_CH_STEREO_LEFT.

  61. #define AV_CH_WIDE_LEFT              0x0000000080000000ULL

  62. #define AV_CH_WIDE_RIGHT             0x0000000100000000ULL

  63. #define AV_CH_SURROUND_DIRECT_LEFT   0x0000000200000000ULL

  64. #define AV_CH_SURROUND_DIRECT_RIGHT  0x0000000400000000ULL

  65. 

  66. /** Channel mask value used for AVCodecContext.request_channel_layout

  67.     to indicate that the user requests the channel order of the decoder output

  68.     to be the native codec channel order. */

  69. #define AV_CH_LAYOUT_NATIVE          0x8000000000000000ULL

  70. 

  71. /**

  72.  * @}

  73.  * @defgroup channel_mask_c Audio channel convenience macros

  74.  * @{

  75.  * */

  76. #define AV_CH_LAYOUT_MONO              (AV_CH_FRONT_CENTER)

  77. #define AV_CH_LAYOUT_STEREO            (AV_CH_FRONT_LEFT|AV_CH_FRONT_RIGHT)

  78. #define AV_CH_LAYOUT_2POINT1           (AV_CH_LAYOUT_STEREO|AV_CH_LOW_FREQUENCY)

  79. #define AV_CH_LAYOUT_2_1               (AV_CH_LAYOUT_STEREO|AV_CH_BACK_CENTER)

  80. #define AV_CH_LAYOUT_SURROUND          (AV_CH_LAYOUT_STEREO|AV_CH_FRONT_CENTER)

  81. #define AV_CH_LAYOUT_3POINT1           (AV_CH_LAYOUT_SURROUND|AV_CH_LOW_FREQUENCY)

  82. #define AV_CH_LAYOUT_4POINT0           (AV_CH_LAYOUT_SURROUND|AV_CH_BACK_CENTER)

  83. #define AV_CH_LAYOUT_4POINT1           (AV_CH_LAYOUT_4POINT0|AV_CH_LOW_FREQUENCY)

  84. #define AV_CH_LAYOUT_2_2               (AV_CH_LAYOUT_STEREO|AV_CH_SIDE_LEFT|AV_CH_SIDE_RIGHT)

  85. #define AV_CH_LAYOUT_QUAD              (AV_CH_LAYOUT_STEREO|AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT)

  86. #define AV_CH_LAYOUT_5POINT0           (AV_CH_LAYOUT_SURROUND|AV_CH_SIDE_LEFT|AV_CH_SIDE_RIGHT)

  87. #define AV_CH_LAYOUT_5POINT1           (AV_CH_LAYOUT_5POINT0|AV_CH_LOW_FREQUENCY)

  88. #define AV_CH_LAYOUT_5POINT0_BACK      (AV_CH_LAYOUT_SURROUND|AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT)

  89. #define AV_CH_LAYOUT_5POINT1_BACK      (AV_CH_LAYOUT_5POINT0_BACK|AV_CH_LOW_FREQUENCY)

  90. #define AV_CH_LAYOUT_6POINT0           (AV_CH_LAYOUT_5POINT0|AV_CH_BACK_CENTER)

  91. #define AV_CH_LAYOUT_6POINT0_FRONT     (AV_CH_LAYOUT_2_2|AV_CH_FRONT_LEFT_OF_CENTER|AV_CH_FRONT_RIGHT_OF_CENTER)

  92. #define AV_CH_LAYOUT_HEXAGONAL         (AV_CH_LAYOUT_5POINT0_BACK|AV_CH_BACK_CENTER)

  93. #define AV_CH_LAYOUT_6POINT1           (AV_CH_LAYOUT_5POINT1|AV_CH_BACK_CENTER)

  94. #define AV_CH_LAYOUT_6POINT1_BACK      (AV_CH_LAYOUT_5POINT1_BACK|AV_CH_BACK_CENTER)

  95. #define AV_CH_LAYOUT_6POINT1_FRONT     (AV_CH_LAYOUT_6POINT0_FRONT|AV_CH_LOW_FREQUENCY)

  96. #define AV_CH_LAYOUT_7POINT0           (AV_CH_LAYOUT_5POINT0|AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT)

  97. #define AV_CH_LAYOUT_7POINT0_FRONT     (AV_CH_LAYOUT_5POINT0|AV_CH_FRONT_LEFT_OF_CENTER|AV_CH_FRONT_RIGHT_OF_CENTER)

  98. #define AV_CH_LAYOUT_7POINT1           (AV_CH_LAYOUT_5POINT1|AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT)

  99. #define AV_CH_LAYOUT_7POINT1_WIDE      (AV_CH_LAYOUT_5POINT1|AV_CH_FRONT_LEFT_OF_CENTER|AV_CH_FRONT_RIGHT_OF_CENTER)

  100. #define AV_CH_LAYOUT_7POINT1_WIDE_BACK (AV_CH_LAYOUT_5POINT1_BACK|AV_CH_FRONT_LEFT_OF_CENTER|AV_CH_FRONT_RIGHT_OF_CENTER)

  101. #define AV_CH_LAYOUT_OCTAGONAL         (AV_CH_LAYOUT_5POINT0|AV_CH_BACK_LEFT|AV_CH_BACK_CENTER|AV_CH_BACK_RIGHT)

  102. #define AV_CH_LAYOUT_STEREO_DOWNMIX    (AV_CH_STEREO_LEFT|AV_CH_STEREO_RIGHT)

  103. 

  104. /**

  105.  * @}

  106.  */

  107. 

  108. /**

  109.  * Return a channel layout id that matches name, 0 if no match.

  110.  */

  111. uint64_t av_get_channel_layout(const char *name);

  112. 

  113. /**

  114.  * Return a description of a channel layout.

  115.  * If nb_channels is <= 0, it is guessed from the channel_layout.

  116.  *

  117.  * @param buf put here the string containing the channel layout

  118.  * @param buf_size size in bytes of the buffer

  119.  */

  120. void av_get_channel_layout_string(char *buf, int buf_size, int nb_channels, uint64_t channel_layout);

  121. 

  122. /**

  123.  * Return the number of channels in the channel layout.

  124.  */

  125. int av_get_channel_layout_nb_channels(uint64_t channel_layout);

  126. 

  127. /**

  128.  * @}

  129.  */

  130. 

  131. #endif /* AVUTIL_AUDIOCONVERT_H */