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https://github.com/xenia-project/FFmpeg.git
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737eb5976f
It is pretty hopeless that other considerable projects will adopt libavutil alone in other projects. Projects that need small footprint are better off with more specialized libraries such as gnulib or rather just copy the necessary parts that they need. With this in mind, nobody is helped by having libavutil and libavcore split. In order to ease maintenance inside and around FFmpeg and to reduce confusion where to put common code, avcore's functionality is merged (back) to avutil. Signed-off-by: Reinhard Tartler <siretart@tauware.de>
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 FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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