diff options
author | Stefano Sabatini <stefano.sabatini-lala@poste.it> | 2010-11-21 19:28:52 +0000 |
---|---|---|
committer | Stefano Sabatini <stefano.sabatini-lala@poste.it> | 2010-11-21 19:28:52 +0000 |
commit | 176a6157c06e020ab6e8522d34ccb9e218435abc (patch) | |
tree | ac15c39650f23f22c49656a9b7097bad67fc5155 /libavcore/audioconvert.c | |
parent | 7df2214328d2b450877294e1fd1c4bf5bd8c022c (diff) | |
download | ffmpeg-streaming-176a6157c06e020ab6e8522d34ccb9e218435abc.zip ffmpeg-streaming-176a6157c06e020ab6e8522d34ccb9e218435abc.tar.gz |
Move audio channel API from libavcodec to libavcore.
Originally committed as revision 25787 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcore/audioconvert.c')
-rw-r--r-- | libavcore/audioconvert.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/libavcore/audioconvert.c b/libavcore/audioconvert.c new file mode 100644 index 0000000..171d6b1 --- /dev/null +++ b/libavcore/audioconvert.c @@ -0,0 +1,113 @@ +/* + * 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 "libavutil/avstring.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; + + 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; +} |