channel_layout.h (9613B)
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 22 #ifndef AVUTIL_CHANNEL_LAYOUT_H 23 #define AVUTIL_CHANNEL_LAYOUT_H 24 25 #include <stdint.h> 26 27 /** 28 * @file 29 * audio channel layout utility functions 30 */ 31 32 /** 33 * @addtogroup lavu_audio 34 * @{ 35 */ 36 37 /** 38 * @defgroup channel_masks Audio channel masks 39 * 40 * A channel layout is a 64-bits integer with a bit set for every channel. 41 * The number of bits set must be equal to the number of channels. 42 * The value 0 means that the channel layout is not known. 43 * @note this data structure is not powerful enough to handle channels 44 * combinations that have the same channel multiple times, such as 45 * dual-mono. 46 * 47 * @{ 48 */ 49 #define AV_CH_FRONT_LEFT 0x00000001 50 #define AV_CH_FRONT_RIGHT 0x00000002 51 #define AV_CH_FRONT_CENTER 0x00000004 52 #define AV_CH_LOW_FREQUENCY 0x00000008 53 #define AV_CH_BACK_LEFT 0x00000010 54 #define AV_CH_BACK_RIGHT 0x00000020 55 #define AV_CH_FRONT_LEFT_OF_CENTER 0x00000040 56 #define AV_CH_FRONT_RIGHT_OF_CENTER 0x00000080 57 #define AV_CH_BACK_CENTER 0x00000100 58 #define AV_CH_SIDE_LEFT 0x00000200 59 #define AV_CH_SIDE_RIGHT 0x00000400 60 #define AV_CH_TOP_CENTER 0x00000800 61 #define AV_CH_TOP_FRONT_LEFT 0x00001000 62 #define AV_CH_TOP_FRONT_CENTER 0x00002000 63 #define AV_CH_TOP_FRONT_RIGHT 0x00004000 64 #define AV_CH_TOP_BACK_LEFT 0x00008000 65 #define AV_CH_TOP_BACK_CENTER 0x00010000 66 #define AV_CH_TOP_BACK_RIGHT 0x00020000 67 #define AV_CH_STEREO_LEFT 0x20000000 ///< Stereo downmix. 68 #define AV_CH_STEREO_RIGHT 0x40000000 ///< See AV_CH_STEREO_LEFT. 69 #define AV_CH_WIDE_LEFT 0x0000000080000000ULL 70 #define AV_CH_WIDE_RIGHT 0x0000000100000000ULL 71 #define AV_CH_SURROUND_DIRECT_LEFT 0x0000000200000000ULL 72 #define AV_CH_SURROUND_DIRECT_RIGHT 0x0000000400000000ULL 73 #define AV_CH_LOW_FREQUENCY_2 0x0000000800000000ULL 74 75 /** Channel mask value used for AVCodecContext.request_channel_layout 76 to indicate that the user requests the channel order of the decoder output 77 to be the native codec channel order. */ 78 #define AV_CH_LAYOUT_NATIVE 0x8000000000000000ULL 79 80 /** 81 * @} 82 * @defgroup channel_mask_c Audio channel layouts 83 * @{ 84 * */ 85 #define AV_CH_LAYOUT_MONO (AV_CH_FRONT_CENTER) 86 #define AV_CH_LAYOUT_STEREO (AV_CH_FRONT_LEFT|AV_CH_FRONT_RIGHT) 87 #define AV_CH_LAYOUT_2POINT1 (AV_CH_LAYOUT_STEREO|AV_CH_LOW_FREQUENCY) 88 #define AV_CH_LAYOUT_2_1 (AV_CH_LAYOUT_STEREO|AV_CH_BACK_CENTER) 89 #define AV_CH_LAYOUT_SURROUND (AV_CH_LAYOUT_STEREO|AV_CH_FRONT_CENTER) 90 #define AV_CH_LAYOUT_3POINT1 (AV_CH_LAYOUT_SURROUND|AV_CH_LOW_FREQUENCY) 91 #define AV_CH_LAYOUT_4POINT0 (AV_CH_LAYOUT_SURROUND|AV_CH_BACK_CENTER) 92 #define AV_CH_LAYOUT_4POINT1 (AV_CH_LAYOUT_4POINT0|AV_CH_LOW_FREQUENCY) 93 #define AV_CH_LAYOUT_2_2 (AV_CH_LAYOUT_STEREO|AV_CH_SIDE_LEFT|AV_CH_SIDE_RIGHT) 94 #define AV_CH_LAYOUT_QUAD (AV_CH_LAYOUT_STEREO|AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT) 95 #define AV_CH_LAYOUT_5POINT0 (AV_CH_LAYOUT_SURROUND|AV_CH_SIDE_LEFT|AV_CH_SIDE_RIGHT) 96 #define AV_CH_LAYOUT_5POINT1 (AV_CH_LAYOUT_5POINT0|AV_CH_LOW_FREQUENCY) 97 #define AV_CH_LAYOUT_5POINT0_BACK (AV_CH_LAYOUT_SURROUND|AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT) 98 #define AV_CH_LAYOUT_5POINT1_BACK (AV_CH_LAYOUT_5POINT0_BACK|AV_CH_LOW_FREQUENCY) 99 #define AV_CH_LAYOUT_6POINT0 (AV_CH_LAYOUT_5POINT0|AV_CH_BACK_CENTER) 100 #define AV_CH_LAYOUT_6POINT0_FRONT (AV_CH_LAYOUT_2_2|AV_CH_FRONT_LEFT_OF_CENTER|AV_CH_FRONT_RIGHT_OF_CENTER) 101 #define AV_CH_LAYOUT_HEXAGONAL (AV_CH_LAYOUT_5POINT0_BACK|AV_CH_BACK_CENTER) 102 #define AV_CH_LAYOUT_6POINT1 (AV_CH_LAYOUT_5POINT1|AV_CH_BACK_CENTER) 103 #define AV_CH_LAYOUT_6POINT1_BACK (AV_CH_LAYOUT_5POINT1_BACK|AV_CH_BACK_CENTER) 104 #define AV_CH_LAYOUT_6POINT1_FRONT (AV_CH_LAYOUT_6POINT0_FRONT|AV_CH_LOW_FREQUENCY) 105 #define AV_CH_LAYOUT_7POINT0 (AV_CH_LAYOUT_5POINT0|AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT) 106 #define AV_CH_LAYOUT_7POINT0_FRONT (AV_CH_LAYOUT_5POINT0|AV_CH_FRONT_LEFT_OF_CENTER|AV_CH_FRONT_RIGHT_OF_CENTER) 107 #define AV_CH_LAYOUT_7POINT1 (AV_CH_LAYOUT_5POINT1|AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT) 108 #define AV_CH_LAYOUT_7POINT1_WIDE (AV_CH_LAYOUT_5POINT1|AV_CH_FRONT_LEFT_OF_CENTER|AV_CH_FRONT_RIGHT_OF_CENTER) 109 #define AV_CH_LAYOUT_7POINT1_WIDE_BACK (AV_CH_LAYOUT_5POINT1_BACK|AV_CH_FRONT_LEFT_OF_CENTER|AV_CH_FRONT_RIGHT_OF_CENTER) 110 #define AV_CH_LAYOUT_OCTAGONAL (AV_CH_LAYOUT_5POINT0|AV_CH_BACK_LEFT|AV_CH_BACK_CENTER|AV_CH_BACK_RIGHT) 111 #define AV_CH_LAYOUT_HEXADECAGONAL (AV_CH_LAYOUT_OCTAGONAL|AV_CH_WIDE_LEFT|AV_CH_WIDE_RIGHT|AV_CH_TOP_BACK_LEFT|AV_CH_TOP_BACK_RIGHT|AV_CH_TOP_BACK_CENTER|AV_CH_TOP_FRONT_CENTER|AV_CH_TOP_FRONT_LEFT|AV_CH_TOP_FRONT_RIGHT) 112 #define AV_CH_LAYOUT_STEREO_DOWNMIX (AV_CH_STEREO_LEFT|AV_CH_STEREO_RIGHT) 113 114 enum AVMatrixEncoding { 115 AV_MATRIX_ENCODING_NONE, 116 AV_MATRIX_ENCODING_DOLBY, 117 AV_MATRIX_ENCODING_DPLII, 118 AV_MATRIX_ENCODING_DPLIIX, 119 AV_MATRIX_ENCODING_DPLIIZ, 120 AV_MATRIX_ENCODING_DOLBYEX, 121 AV_MATRIX_ENCODING_DOLBYHEADPHONE, 122 AV_MATRIX_ENCODING_NB 123 }; 124 125 /** 126 * Return a channel layout id that matches name, or 0 if no match is found. 127 * 128 * name can be one or several of the following notations, 129 * separated by '+' or '|': 130 * - the name of an usual channel layout (mono, stereo, 4.0, quad, 5.0, 131 * 5.0(side), 5.1, 5.1(side), 7.1, 7.1(wide), downmix); 132 * - the name of a single channel (FL, FR, FC, LFE, BL, BR, FLC, FRC, BC, 133 * SL, SR, TC, TFL, TFC, TFR, TBL, TBC, TBR, DL, DR); 134 * - a number of channels, in decimal, followed by 'c', yielding 135 * the default channel layout for that number of channels (@see 136 * av_get_default_channel_layout); 137 * - a channel layout mask, in hexadecimal starting with "0x" (see the 138 * AV_CH_* macros). 139 * 140 * Example: "stereo+FC" = "2c+FC" = "2c+1c" = "0x7" 141 */ 142 uint64_t av_get_channel_layout(const char *name); 143 144 /** 145 * Return a channel layout and the number of channels based on the specified name. 146 * 147 * This function is similar to (@see av_get_channel_layout), but can also parse 148 * unknown channel layout specifications. 149 * 150 * @param[in] name channel layout specification string 151 * @param[out] channel_layout parsed channel layout (0 if unknown) 152 * @param[out] nb_channels number of channels 153 * 154 * @return 0 on success, AVERROR(EINVAL) if the parsing fails. 155 */ 156 int av_get_extended_channel_layout(const char *name, uint64_t* channel_layout, int* nb_channels); 157 158 /** 159 * Return a description of a channel layout. 160 * If nb_channels is <= 0, it is guessed from the channel_layout. 161 * 162 * @param buf put here the string containing the channel layout 163 * @param buf_size size in bytes of the buffer 164 */ 165 void av_get_channel_layout_string(char *buf, int buf_size, int nb_channels, uint64_t channel_layout); 166 167 struct AVBPrint; 168 /** 169 * Append a description of a channel layout to a bprint buffer. 170 */ 171 void av_bprint_channel_layout(struct AVBPrint *bp, int nb_channels, uint64_t channel_layout); 172 173 /** 174 * Return the number of channels in the channel layout. 175 */ 176 int av_get_channel_layout_nb_channels(uint64_t channel_layout); 177 178 /** 179 * Return default channel layout for a given number of channels. 180 */ 181 int64_t av_get_default_channel_layout(int nb_channels); 182 183 /** 184 * Get the index of a channel in channel_layout. 185 * 186 * @param channel a channel layout describing exactly one channel which must be 187 * present in channel_layout. 188 * 189 * @return index of channel in channel_layout on success, a negative AVERROR 190 * on error. 191 */ 192 int av_get_channel_layout_channel_index(uint64_t channel_layout, 193 uint64_t channel); 194 195 /** 196 * Get the channel with the given index in channel_layout. 197 */ 198 uint64_t av_channel_layout_extract_channel(uint64_t channel_layout, int index); 199 200 /** 201 * Get the name of a given channel. 202 * 203 * @return channel name on success, NULL on error. 204 */ 205 const char *av_get_channel_name(uint64_t channel); 206 207 /** 208 * Get the description of a given channel. 209 * 210 * @param channel a channel layout with a single channel 211 * @return channel description on success, NULL on error 212 */ 213 const char *av_get_channel_description(uint64_t channel); 214 215 /** 216 * Get the value and name of a standard channel layout. 217 * 218 * @param[in] index index in an internal list, starting at 0 219 * @param[out] layout channel layout mask 220 * @param[out] name name of the layout 221 * @return 0 if the layout exists, 222 * <0 if index is beyond the limits 223 */ 224 int av_get_standard_channel_layout(unsigned index, uint64_t *layout, 225 const char **name); 226 227 /** 228 * @} 229 * @} 230 */ 231 232 #endif /* AVUTIL_CHANNEL_LAYOUT_H */