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| 4349 | Serge | 1 | /* |
| 2 | * Copyright (c) 2006 Michael Niedermayer |
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| 3 | * |
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| 4 | * This file is part of FFmpeg. |
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| 5 | * |
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| 6 | * FFmpeg is free software; you can redistribute it and/or |
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| 7 | * modify it under the terms of the GNU Lesser General Public |
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| 8 | * License as published by the Free Software Foundation; either |
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| 9 | * version 2.1 of the License, or (at your option) any later version. |
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| 10 | * |
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| 11 | * FFmpeg is distributed in the hope that it will be useful, |
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | * Lesser General Public License for more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU Lesser General Public |
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| 17 | * License along with FFmpeg; if not, write to the Free Software |
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| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 19 | */ |
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| 20 | |||
| 21 | /** |
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| 22 | * @file |
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| 23 | * audio channel layout utility functions |
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| 24 | */ |
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| 25 | |||
| 26 | #include "avstring.h" |
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| 27 | #include "avutil.h" |
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| 28 | #include "channel_layout.h" |
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| 29 | #include "bprint.h" |
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| 30 | #include "common.h" |
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| 31 | |||
| 32 | struct channel_name { |
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| 33 | const char *name; |
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| 34 | const char *description; |
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| 35 | }; |
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| 36 | |||
| 37 | static const struct channel_name channel_names[] = { |
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| 38 | [0] = { "FL", "front left" }, |
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| 39 | [1] = { "FR", "front right" }, |
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| 40 | [2] = { "FC", "front center" }, |
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| 41 | [3] = { "LFE", "low frequency" }, |
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| 42 | [4] = { "BL", "back left" }, |
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| 43 | [5] = { "BR", "back right" }, |
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| 44 | [6] = { "FLC", "front left-of-center" }, |
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| 45 | [7] = { "FRC", "front right-of-center" }, |
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| 46 | [8] = { "BC", "back center" }, |
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| 47 | [9] = { "SL", "side left" }, |
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| 48 | [10] = { "SR", "side right" }, |
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| 49 | [11] = { "TC", "top center" }, |
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| 50 | [12] = { "TFL", "top front left" }, |
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| 51 | [13] = { "TFC", "top front center" }, |
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| 52 | [14] = { "TFR", "top front right" }, |
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| 53 | [15] = { "TBL", "top back left" }, |
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| 54 | [16] = { "TBC", "top back center" }, |
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| 55 | [17] = { "TBR", "top back right" }, |
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| 56 | [29] = { "DL", "downmix left" }, |
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| 57 | [30] = { "DR", "downmix right" }, |
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| 58 | [31] = { "WL", "wide left" }, |
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| 59 | [32] = { "WR", "wide right" }, |
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| 60 | [33] = { "SDL", "surround direct left" }, |
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| 61 | [34] = { "SDR", "surround direct right" }, |
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| 62 | [35] = { "LFE2", "low frequency 2" }, |
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| 63 | }; |
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| 64 | |||
| 65 | static const char *get_channel_name(int channel_id) |
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| 66 | { |
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| 67 | if (channel_id < 0 || channel_id >= FF_ARRAY_ELEMS(channel_names)) |
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| 68 | return NULL; |
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| 69 | return channel_names[channel_id].name; |
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| 70 | } |
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| 71 | |||
| 72 | static const struct { |
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| 73 | const char *name; |
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| 74 | int nb_channels; |
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| 75 | uint64_t layout; |
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| 76 | } channel_layout_map[] = { |
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| 77 | { "mono", 1, AV_CH_LAYOUT_MONO }, |
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| 78 | { "stereo", 2, AV_CH_LAYOUT_STEREO }, |
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| 79 | { "2.1", 3, AV_CH_LAYOUT_2POINT1 }, |
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| 80 | { "3.0", 3, AV_CH_LAYOUT_SURROUND }, |
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| 81 | { "3.0(back)", 3, AV_CH_LAYOUT_2_1 }, |
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| 82 | { "4.0", 4, AV_CH_LAYOUT_4POINT0 }, |
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| 83 | { "quad", 4, AV_CH_LAYOUT_QUAD }, |
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| 84 | { "quad(side)", 4, AV_CH_LAYOUT_2_2 }, |
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| 85 | { "3.1", 4, AV_CH_LAYOUT_3POINT1 }, |
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| 86 | { "5.0", 5, AV_CH_LAYOUT_5POINT0_BACK }, |
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| 87 | { "5.0(side)", 5, AV_CH_LAYOUT_5POINT0 }, |
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| 88 | { "4.1", 5, AV_CH_LAYOUT_4POINT1 }, |
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| 89 | { "5.1", 6, AV_CH_LAYOUT_5POINT1_BACK }, |
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| 90 | { "5.1(side)", 6, AV_CH_LAYOUT_5POINT1 }, |
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| 91 | { "6.0", 6, AV_CH_LAYOUT_6POINT0 }, |
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| 92 | { "6.0(front)", 6, AV_CH_LAYOUT_6POINT0_FRONT }, |
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| 93 | { "hexagonal", 6, AV_CH_LAYOUT_HEXAGONAL }, |
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| 94 | { "6.1", 7, AV_CH_LAYOUT_6POINT1 }, |
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| 95 | { "6.1", 7, AV_CH_LAYOUT_6POINT1_BACK }, |
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| 96 | { "6.1(front)", 7, AV_CH_LAYOUT_6POINT1_FRONT }, |
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| 97 | { "7.0", 7, AV_CH_LAYOUT_7POINT0 }, |
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| 98 | { "7.0(front)", 7, AV_CH_LAYOUT_7POINT0_FRONT }, |
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| 99 | { "7.1", 8, AV_CH_LAYOUT_7POINT1 }, |
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| 100 | { "7.1(wide)", 8, AV_CH_LAYOUT_7POINT1_WIDE_BACK }, |
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| 101 | { "7.1(wide-side)", 8, AV_CH_LAYOUT_7POINT1_WIDE }, |
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| 102 | { "octagonal", 8, AV_CH_LAYOUT_OCTAGONAL }, |
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| 103 | { "downmix", 2, AV_CH_LAYOUT_STEREO_DOWNMIX, }, |
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| 104 | }; |
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| 105 | |||
| 106 | #if FF_API_GET_CHANNEL_LAYOUT_COMPAT |
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| 107 | static uint64_t get_channel_layout_single(const char *name, int name_len, int compat) |
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| 108 | #else |
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| 109 | static uint64_t get_channel_layout_single(const char *name, int name_len) |
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| 110 | #endif |
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| 111 | { |
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| 112 | int i; |
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| 113 | char *end; |
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| 114 | int64_t layout; |
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| 115 | |||
| 116 | for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++) { |
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| 117 | if (strlen(channel_layout_map[i].name) == name_len && |
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| 118 | !memcmp(channel_layout_map[i].name, name, name_len)) |
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| 119 | return channel_layout_map[i].layout; |
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| 120 | } |
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| 121 | for (i = 0; i < FF_ARRAY_ELEMS(channel_names); i++) |
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| 122 | if (channel_names[i].name && |
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| 123 | strlen(channel_names[i].name) == name_len && |
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| 124 | !memcmp(channel_names[i].name, name, name_len)) |
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| 125 | return (int64_t)1 << i; |
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| 126 | i = strtol(name, &end, 10); |
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| 127 | |||
| 128 | #if FF_API_GET_CHANNEL_LAYOUT_COMPAT |
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| 129 | if (compat) { |
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| 130 | if (end - name == name_len || |
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| 131 | (end + 1 - name == name_len && *end == 'c')) { |
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| 132 | layout = av_get_default_channel_layout(i); |
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| 133 | if (end - name == name_len) { |
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| 134 | av_log(NULL, AV_LOG_WARNING, |
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| 135 | "Single channel layout '%.*s' is interpreted as a number of channels, " |
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| 136 | "switch to the syntax '%.*sc' otherwise it will be interpreted as a " |
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| 137 | "channel layout number in a later version\n", |
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| 138 | name_len, name, name_len, name); |
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| 139 | return layout; |
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| 140 | } |
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| 141 | } |
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| 142 | } else { |
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| 143 | #endif |
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| 144 | if ((end + 1 - name == name_len && *end == 'c')) |
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| 145 | return av_get_default_channel_layout(i); |
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| 146 | #if FF_API_GET_CHANNEL_LAYOUT_COMPAT |
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| 147 | } |
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| 148 | #endif |
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| 149 | |||
| 150 | layout = strtoll(name, &end, 0); |
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| 151 | if (end - name == name_len) |
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| 152 | return FFMAX(layout, 0); |
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| 153 | return 0; |
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| 154 | } |
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| 155 | |||
| 156 | #if FF_API_GET_CHANNEL_LAYOUT_COMPAT |
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| 157 | uint64_t ff_get_channel_layout(const char *name, int compat) |
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| 158 | #else |
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| 159 | uint64_t av_get_channel_layout(const char *name) |
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| 160 | #endif |
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| 161 | { |
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| 162 | const char *n, *e; |
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| 163 | const char *name_end = name + strlen(name); |
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| 164 | int64_t layout = 0, layout_single; |
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| 165 | |||
| 166 | for (n = name; n < name_end; n = e + 1) { |
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| 167 | for (e = n; e < name_end && *e != '+' && *e != '|'; e++); |
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| 168 | #if FF_API_GET_CHANNEL_LAYOUT_COMPAT |
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| 169 | layout_single = get_channel_layout_single(n, e - n, compat); |
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| 170 | #else |
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| 171 | layout_single = get_channel_layout_single(n, e - n); |
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| 172 | #endif |
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| 173 | if (!layout_single) |
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| 174 | return 0; |
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| 175 | layout |= layout_single; |
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| 176 | } |
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| 177 | return layout; |
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| 178 | } |
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| 179 | |||
| 180 | #if FF_API_GET_CHANNEL_LAYOUT_COMPAT |
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| 181 | uint64_t av_get_channel_layout(const char *name) |
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| 182 | { |
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| 183 | return ff_get_channel_layout(name, 1); |
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| 184 | } |
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| 185 | #endif |
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| 186 | |||
| 187 | void av_bprint_channel_layout(struct AVBPrint *bp, |
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| 188 | int nb_channels, uint64_t channel_layout) |
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| 189 | { |
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| 190 | int i; |
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| 191 | |||
| 192 | if (nb_channels <= 0) |
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| 193 | nb_channels = av_get_channel_layout_nb_channels(channel_layout); |
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| 194 | |||
| 195 | for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++) |
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| 196 | if (nb_channels == channel_layout_map[i].nb_channels && |
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| 197 | channel_layout == channel_layout_map[i].layout) { |
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| 198 | av_bprintf(bp, "%s", channel_layout_map[i].name); |
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| 199 | return; |
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| 200 | } |
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| 201 | |||
| 202 | av_bprintf(bp, "%d channels", nb_channels); |
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| 203 | if (channel_layout) { |
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| 204 | int i, ch; |
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| 205 | av_bprintf(bp, " ("); |
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| 206 | for (i = 0, ch = 0; i < 64; i++) { |
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| 207 | if ((channel_layout & (UINT64_C(1) << i))) { |
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| 208 | const char *name = get_channel_name(i); |
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| 209 | if (name) { |
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| 210 | if (ch > 0) |
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| 211 | av_bprintf(bp, "+"); |
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| 212 | av_bprintf(bp, "%s", name); |
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| 213 | } |
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| 214 | ch++; |
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| 215 | } |
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| 216 | } |
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| 217 | av_bprintf(bp, ")"); |
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| 218 | } |
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| 219 | } |
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| 220 | |||
| 221 | void av_get_channel_layout_string(char *buf, int buf_size, |
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| 222 | int nb_channels, uint64_t channel_layout) |
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| 223 | { |
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| 224 | AVBPrint bp; |
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| 225 | |||
| 226 | av_bprint_init_for_buffer(&bp, buf, buf_size); |
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| 227 | av_bprint_channel_layout(&bp, nb_channels, channel_layout); |
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| 228 | } |
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| 229 | |||
| 230 | int av_get_channel_layout_nb_channels(uint64_t channel_layout) |
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| 231 | { |
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| 232 | return av_popcount64(channel_layout); |
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| 233 | } |
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| 234 | |||
| 235 | int64_t av_get_default_channel_layout(int nb_channels) { |
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| 236 | int i; |
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| 237 | for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++) |
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| 238 | if (nb_channels == channel_layout_map[i].nb_channels) |
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| 239 | return channel_layout_map[i].layout; |
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| 240 | return 0; |
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| 241 | } |
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| 242 | |||
| 243 | int av_get_channel_layout_channel_index(uint64_t channel_layout, |
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| 244 | uint64_t channel) |
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| 245 | { |
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| 246 | if (!(channel_layout & channel) || |
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| 247 | av_get_channel_layout_nb_channels(channel) != 1) |
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| 248 | return AVERROR(EINVAL); |
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| 249 | channel_layout &= channel - 1; |
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| 250 | return av_get_channel_layout_nb_channels(channel_layout); |
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| 251 | } |
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| 252 | |||
| 253 | const char *av_get_channel_name(uint64_t channel) |
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| 254 | { |
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| 255 | int i; |
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| 256 | if (av_get_channel_layout_nb_channels(channel) != 1) |
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| 257 | return NULL; |
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| 258 | for (i = 0; i < 64; i++) |
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| 259 | if ((1ULL< |
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| 260 | return get_channel_name(i); |
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| 261 | return NULL; |
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| 262 | } |
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| 263 | |||
| 264 | const char *av_get_channel_description(uint64_t channel) |
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| 265 | { |
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| 266 | int i; |
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| 267 | if (av_get_channel_layout_nb_channels(channel) != 1) |
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| 268 | return NULL; |
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| 269 | for (i = 0; i < FF_ARRAY_ELEMS(channel_names); i++) |
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| 270 | if ((1ULL< |
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| 271 | return channel_names[i].description; |
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| 272 | return NULL; |
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| 273 | } |
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| 274 | |||
| 275 | uint64_t av_channel_layout_extract_channel(uint64_t channel_layout, int index) |
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| 276 | { |
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| 277 | int i; |
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| 278 | |||
| 279 | if (av_get_channel_layout_nb_channels(channel_layout) <= index) |
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| 280 | return 0; |
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| 281 | |||
| 282 | for (i = 0; i < 64; i++) { |
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| 283 | if ((1ULL << i) & channel_layout && !index--) |
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| 284 | return 1ULL << i; |
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| 285 | } |
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| 286 | return 0; |
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| 287 | } |
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| 288 | |||
| 289 | int av_get_standard_channel_layout(unsigned index, uint64_t *layout, |
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| 290 | const char **name) |
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| 291 | { |
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| 292 | if (index >= FF_ARRAY_ELEMS(channel_layout_map)) |
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| 293 | return AVERROR_EOF; |
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| 294 | if (layout) *layout = channel_layout_map[index].layout; |
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| 295 | if (name) *name = channel_layout_map[index].name; |
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| 296 | return 0; |
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| 297 | } |