/* * Copyright (c) 2006 Michael Niedermayer * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; 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 #include "avstring.h" #include "avutil.h" #include "channel_layout.h" #include "common.h" static const char * const 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]; } 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 }, { "stereo", 2, AV_CH_LAYOUT_STEREO_DOWNMIX }, { "2.1", 3, AV_CH_LAYOUT_2POINT1 }, { "3.0", 3, AV_CH_LAYOUT_SURROUND }, { "3.0(back)", 3, AV_CH_LAYOUT_2_1 }, { "3.1", 4, AV_CH_LAYOUT_3POINT1 }, { "4.0", 4, AV_CH_LAYOUT_4POINT0 }, { "quad", 4, AV_CH_LAYOUT_QUAD }, { "quad(side)", 4, AV_CH_LAYOUT_2_2 }, { "4.1", 5, AV_CH_LAYOUT_4POINT1 }, { "5.0", 5, AV_CH_LAYOUT_5POINT0 }, { "5.0", 5, AV_CH_LAYOUT_5POINT0_BACK }, { "5.1", 6, AV_CH_LAYOUT_5POINT1 }, { "5.1", 6, AV_CH_LAYOUT_5POINT1_BACK }, { "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", 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 }, { "7.1(wide)", 8, AV_CH_LAYOUT_7POINT1_WIDE_BACK }, { "octagonal", 8, AV_CH_LAYOUT_OCTAGONAL }, { "hexadecagonal", 16, AV_CH_LAYOUT_HEXADECAGONAL }, { "downmix", 2, AV_CH_LAYOUT_STEREO_DOWNMIX, }, { 0 } }; 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) - 1; 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] && strlen(channel_names[i]) == name_len && !memcmp(channel_names[i], name, name_len)) return (int64_t)1 << i; i = strtol(name, &end, 10); if (end - name == name_len || (end + 1 - name == name_len && *end == 'c')) return av_get_default_channel_layout(i); layout = strtoll(name, &end, 0); if (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; } void av_get_channel_layout_string(char *buf, int buf_size, 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; channel_layout_map[i].name; i++) if (nb_channels == channel_layout_map[i].nb_channels && channel_layout == channel_layout_map[i].layout) { av_strlcpy(buf, channel_layout_map[i].name, buf_size); return; } snprintf(buf, buf_size, "%d channels", nb_channels); if (channel_layout) { int i, ch; av_strlcat(buf, " (", buf_size); 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_strlcat(buf, "|", buf_size); av_strlcat(buf, name, buf_size); } ch++; } } av_strlcat(buf, ")", buf_size); } } int av_get_channel_layout_nb_channels(uint64_t channel_layout) { return av_popcount64(channel_layout); } uint64_t av_get_default_channel_layout(int nb_channels) { switch(nb_channels) { case 1: return AV_CH_LAYOUT_MONO; case 2: return AV_CH_LAYOUT_STEREO; case 3: return AV_CH_LAYOUT_SURROUND; case 4: return AV_CH_LAYOUT_QUAD; case 5: return AV_CH_LAYOUT_5POINT0; case 6: return AV_CH_LAYOUT_5POINT1; case 7: return AV_CH_LAYOUT_6POINT1; case 8: return AV_CH_LAYOUT_7POINT1; case 16: return AV_CH_LAYOUT_HEXADECAGONAL; default: 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<