118 lines
3.6 KiB
C
118 lines
3.6 KiB
C
/*
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* Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* audio conversion routines
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*/
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#include "libavutil/avutil.h"
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#include "libavutil/avstring.h"
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#include "audioconvert.h"
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static const char * const channel_names[] = {
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"FL", "FR", "FC", "LFE", "BL", "BR", "FLC", "FRC",
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"BC", "SL", "SR", "TC", "TFL", "TFC", "TFR", "TBL",
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"TBC", "TBR",
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[29] = "DL",
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[30] = "DR",
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};
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static const char *get_channel_name(int channel_id)
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{
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if (channel_id < 0 || channel_id >= FF_ARRAY_ELEMS(channel_names))
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return NULL;
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return channel_names[channel_id];
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}
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static const struct {
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const char *name;
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int nb_channels;
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int64_t layout;
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} channel_layout_map[] = {
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{ "mono", 1, AV_CH_LAYOUT_MONO },
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{ "stereo", 2, AV_CH_LAYOUT_STEREO },
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{ "4.0", 4, AV_CH_LAYOUT_4POINT0 },
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{ "quad", 4, AV_CH_LAYOUT_QUAD },
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{ "5.0", 5, AV_CH_LAYOUT_5POINT0 },
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{ "5.0", 5, AV_CH_LAYOUT_5POINT0_BACK },
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{ "5.1", 6, AV_CH_LAYOUT_5POINT1 },
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{ "5.1", 6, AV_CH_LAYOUT_5POINT1_BACK },
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{ "5.1+downmix", 8, AV_CH_LAYOUT_5POINT1|AV_CH_LAYOUT_STEREO_DOWNMIX, },
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{ "7.1", 8, AV_CH_LAYOUT_7POINT1 },
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{ "7.1(wide)", 8, AV_CH_LAYOUT_7POINT1_WIDE },
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{ "7.1+downmix", 10, AV_CH_LAYOUT_7POINT1|AV_CH_LAYOUT_STEREO_DOWNMIX, },
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{ 0 }
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};
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int64_t av_get_channel_layout(const char *name)
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{
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int i = 0;
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do {
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if (!strcmp(channel_layout_map[i].name, name))
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return channel_layout_map[i].layout;
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i++;
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} while (channel_layout_map[i].name);
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return 0;
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}
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void av_get_channel_layout_string(char *buf, int buf_size,
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int nb_channels, int64_t channel_layout)
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{
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int i;
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if (nb_channels <= 0)
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nb_channels = av_get_channel_layout_nb_channels(channel_layout);
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for (i = 0; channel_layout_map[i].name; i++)
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if (nb_channels == channel_layout_map[i].nb_channels &&
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channel_layout == channel_layout_map[i].layout) {
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av_strlcpy(buf, channel_layout_map[i].name, buf_size);
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return;
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}
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snprintf(buf, buf_size, "%d channels", nb_channels);
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if (channel_layout) {
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int i,ch;
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av_strlcat(buf, " (", buf_size);
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for(i=0,ch=0; i<64; i++) {
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if ((channel_layout & (1L<<i))) {
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const char *name = get_channel_name(i);
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if (name) {
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if (ch>0) av_strlcat(buf, "|", buf_size);
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av_strlcat(buf, name, buf_size);
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}
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ch++;
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}
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}
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av_strlcat(buf, ")", buf_size);
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}
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}
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int av_get_channel_layout_nb_channels(int64_t channel_layout)
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{
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int count;
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uint64_t x = channel_layout;
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for (count = 0; x; count++)
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x &= x-1; // unset lowest set bit
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return count;
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}
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