/* * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * audio channel layout utility functions */ #include <stdint.h> #include "avstring.h" #include "avutil.h" #include "channel_layout.h" #include "bprint.h" #include "common.h" struct channel_name { const char *name; const char *description; }; static const struct channel_name channel_names[] = { [0] = { "FL", "front left" }, [1] = { "FR", "front right" }, [2] = { "FC", "front center" }, [3] = { "LFE", "low frequency" }, [4] = { "BL", "back left" }, [5] = { "BR", "back right" }, [6] = { "FLC", "front left-of-center" }, [7] = { "FRC", "front right-of-center" }, [8] = { "BC", "back center" }, [9] = { "SL", "side left" }, [10] = { "SR", "side right" }, [11] = { "TC", "top center" }, [12] = { "TFL", "top front left" }, [13] = { "TFC", "top front center" }, [14] = { "TFR", "top front right" }, [15] = { "TBL", "top back left" }, [16] = { "TBC", "top back center" }, [17] = { "TBR", "top back right" }, [29] = { "DL", "downmix left" }, [30] = { "DR", "downmix right" }, [31] = { "WL", "wide left" }, [32] = { "WR", "wide right" }, [33] = { "SDL", "surround direct left" }, [34] = { "SDR", "surround direct right" }, [35] = { "LFE2", "low frequency 2" }, }; static const char *get_channel_name(int channel_id) { if (channel_id < 0 || channel_id >= FF_ARRAY_ELEMS(channel_names)) return NULL; return channel_names[channel_id].name; } static const struct { const char *name; int nb_channels; uint64_t layout; } channel_layout_map[] = { { "mono", 1, AV_CH_LAYOUT_MONO }, { "stereo", 2, AV_CH_LAYOUT_STEREO }, { "2.1", 3, AV_CH_LAYOUT_2POINT1 }, { "3.0", 3, AV_CH_LAYOUT_SURROUND }, { "3.0(back)", 3, AV_CH_LAYOUT_2_1 }, { "4.0", 4, AV_CH_LAYOUT_4POINT0 }, { "quad", 4, AV_CH_LAYOUT_QUAD }, { "quad(side)", 4, AV_CH_LAYOUT_2_2 }, { "3.1", 4, AV_CH_LAYOUT_3POINT1 }, { "5.0", 5, AV_CH_LAYOUT_5POINT0_BACK }, { "5.0(side)", 5, AV_CH_LAYOUT_5POINT0 }, { "4.1", 5, AV_CH_LAYOUT_4POINT1 }, { "5.1", 6, AV_CH_LAYOUT_5POINT1_BACK }, { "5.1(side)", 6, AV_CH_LAYOUT_5POINT1 }, { "6.0", 6, AV_CH_LAYOUT_6POINT0 }, { "6.0(front)", 6, AV_CH_LAYOUT_6POINT0_FRONT }, { "hexagonal", 6, AV_CH_LAYOUT_HEXAGONAL }, { "6.1", 7, AV_CH_LAYOUT_6POINT1 }, { "6.1(back)", 7, AV_CH_LAYOUT_6POINT1_BACK }, { "6.1(front)", 7, AV_CH_LAYOUT_6POINT1_FRONT }, { "7.0", 7, AV_CH_LAYOUT_7POINT0 }, { "7.0(front)", 7, AV_CH_LAYOUT_7POINT0_FRONT }, { "7.1", 8, AV_CH_LAYOUT_7POINT1 }, { "7.1(wide)", 8, AV_CH_LAYOUT_7POINT1_WIDE_BACK }, { "7.1(wide-side)", 8, AV_CH_LAYOUT_7POINT1_WIDE }, { "octagonal", 8, AV_CH_LAYOUT_OCTAGONAL }, { "hexadecagonal", 16, AV_CH_LAYOUT_HEXADECAGONAL }, { "downmix", 2, AV_CH_LAYOUT_STEREO_DOWNMIX, }, }; static uint64_t get_channel_layout_single(const char *name, int name_len) { int i; char *end; int64_t layout; for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++) { if (strlen(channel_layout_map[i].name) == name_len && !memcmp(channel_layout_map[i].name, name, name_len)) return channel_layout_map[i].layout; } for (i = 0; i < FF_ARRAY_ELEMS(channel_names); i++) if (channel_names[i].name && strlen(channel_names[i].name) == name_len && !memcmp(channel_names[i].name, name, name_len)) return (int64_t)1 << i; errno = 0; i = strtol(name, &end, 10); if (!errno && (end + 1 - name == name_len && *end == 'c')) return av_get_default_channel_layout(i); errno = 0; layout = strtoll(name, &end, 0); if (!errno && end - name == name_len) return FFMAX(layout, 0); return 0; } uint64_t av_get_channel_layout(const char *name) { const char *n, *e; const char *name_end = name + strlen(name); int64_t layout = 0, layout_single; for (n = name; n < name_end; n = e + 1) { for (e = n; e < name_end && *e != '+' && *e != '|'; e++); layout_single = get_channel_layout_single(n, e - n); if (!layout_single) return 0; layout |= layout_single; } return layout; } int av_get_extended_channel_layout(const char *name, uint64_t* channel_layout, int* nb_channels) { int nb = 0; char *end; uint64_t layout = av_get_channel_layout(name); if (layout) { *channel_layout = layout; *nb_channels = av_get_channel_layout_nb_channels(layout); return 0; } nb = strtol(name, &end, 10); if (!errno && *end == 'C' && *(end + 1) == '\0' && nb > 0 && nb < 64) { *channel_layout = 0; *nb_channels = nb; return 0; } return AVERROR(EINVAL); } void av_bprint_channel_layout(struct AVBPrint *bp, int nb_channels, uint64_t channel_layout) { int i; if (nb_channels <= 0) nb_channels = av_get_channel_layout_nb_channels(channel_layout); for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++) if (nb_channels == channel_layout_map[i].nb_channels && channel_layout == channel_layout_map[i].layout) { av_bprintf(bp, "%s", channel_layout_map[i].name); return; } av_bprintf(bp, "%d channels", nb_channels); if (channel_layout) { int i, ch; av_bprintf(bp, " ("); for (i = 0, ch = 0; i < 64; i++) { if ((channel_layout & (UINT64_C(1) << i))) { const char *name = get_channel_name(i); if (name) { if (ch > 0) av_bprintf(bp, "+"); av_bprintf(bp, "%s", name); } ch++; } } av_bprintf(bp, ")"); } } void av_get_channel_layout_string(char *buf, int buf_size, int nb_channels, uint64_t channel_layout) { AVBPrint bp; av_bprint_init_for_buffer(&bp, buf, buf_size); av_bprint_channel_layout(&bp, nb_channels, channel_layout); } int av_get_channel_layout_nb_channels(uint64_t channel_layout) { return av_popcount64(channel_layout); } int64_t av_get_default_channel_layout(int nb_channels) { int i; for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++) if (nb_channels == channel_layout_map[i].nb_channels) return channel_layout_map[i].layout; return 0; } int av_get_channel_layout_channel_index(uint64_t channel_layout, uint64_t channel) { if (!(channel_layout & channel) || av_get_channel_layout_nb_channels(channel) != 1) return AVERROR(EINVAL); channel_layout &= channel - 1; return av_get_channel_layout_nb_channels(channel_layout); } const char *av_get_channel_name(uint64_t channel) { int i; if (av_get_channel_layout_nb_channels(channel) != 1) return NULL; for (i = 0; i < 64; i++) if ((1ULL<<i) & channel) return get_channel_name(i); return NULL; } const char *av_get_channel_description(uint64_t channel) { int i; if (av_get_channel_layout_nb_channels(channel) != 1) return NULL; for (i = 0; i < FF_ARRAY_ELEMS(channel_names); i++) if ((1ULL<<i) & channel) return channel_names[i].description; return NULL; } uint64_t av_channel_layout_extract_channel(uint64_t channel_layout, int index) { int i; if (av_get_channel_layout_nb_channels(channel_layout) <= index) return 0; for (i = 0; i < 64; i++) { if ((1ULL << i) & channel_layout && !index--) return 1ULL << i; } return 0; } int av_get_standard_channel_layout(unsigned index, uint64_t *layout, const char **name) { if (index >= FF_ARRAY_ELEMS(channel_layout_map)) return AVERROR_EOF; if (layout) *layout = channel_layout_map[index].layout; if (name) *name = channel_layout_map[index].name; return 0; }