| /* |
| * 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 conversion routines |
| */ |
| |
| #include "avstring.h" |
| #include "avutil.h" |
| #include "audioconvert.h" |
| |
| static const char * const channel_names[] = { |
| "FL", "FR", "FC", "LFE", "BL", "BR", "FLC", "FRC", |
| "BC", "SL", "SR", "TC", "TFL", "TFC", "TFR", "TBL", |
| "TBC", "TBR", |
| [29] = "DL", |
| [30] = "DR", |
| }; |
| |
| 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; |
| int64_t layout; |
| } channel_layout_map[] = { |
| { "mono", 1, AV_CH_LAYOUT_MONO }, |
| { "stereo", 2, AV_CH_LAYOUT_STEREO }, |
| { "4.0", 4, AV_CH_LAYOUT_4POINT0 }, |
| { "quad", 4, AV_CH_LAYOUT_QUAD }, |
| { "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 }, |
| { "5.1+downmix", 8, AV_CH_LAYOUT_5POINT1|AV_CH_LAYOUT_STEREO_DOWNMIX, }, |
| { "7.1", 8, AV_CH_LAYOUT_7POINT1 }, |
| { "7.1(wide)", 8, AV_CH_LAYOUT_7POINT1_WIDE }, |
| { "7.1+downmix", 10, AV_CH_LAYOUT_7POINT1|AV_CH_LAYOUT_STEREO_DOWNMIX, }, |
| { 0 } |
| }; |
| |
| int64_t av_get_channel_layout(const char *name) |
| { |
| int i = 0; |
| do { |
| if (!strcmp(channel_layout_map[i].name, name)) |
| return channel_layout_map[i].layout; |
| i++; |
| } while (channel_layout_map[i].name); |
| |
| return 0; |
| } |
| |
| void av_get_channel_layout_string(char *buf, int buf_size, |
| int nb_channels, int64_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 & (1L<<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(int64_t channel_layout) |
| { |
| int count; |
| uint64_t x = channel_layout; |
| for (count = 0; x; count++) |
| x &= x-1; // unset lowest set bit |
| return count; |
| } |