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| author | Andreas Rheinhardt <andreas.rheinhardt@outlook.com> | 2021-02-09 18:25:13 +0100 |
|---|---|---|
| committer | Andreas Rheinhardt <andreas.rheinhardt@outlook.com> | 2022-01-04 13:16:49 +0100 |
| commit | d7a75d21635eab4f4a1efea22945933059c2e36f (patch) | |
| tree | 936c16681a38f85298f1b45201ac79686ecb14d4 /libavcodec/ac3_channel_layout_tab.h | |
| parent | 3d53cefb49289e5e27b652e13623017b05ace452 (diff) | |
| download | ffmpeg-d7a75d21635eab4f4a1efea22945933059c2e36f.tar.gz | |
avcodec/ac3tab: Unavpriv ac3_channel_layout_tab
It is small (16 B) and therefore the overhead of exporting it more
than outweighs the size savings from not having duplicated symbols:
When the symbol is no longer avpriv, one saves twice the size of
the string containing the symbols name (2x30 byte), two entries
in .dynsym (24 bytes each on x64), one entry in the importing libraries
.got and .rela.dyn (8 + 24 bytes on x64) and two entries for the
symbol version (2 bytes each) and one hash value in the exporting
library (4 bytes).
(The exact numbers are of course different for other platforms
(e.g. when using dlls), but given that the strings saved alone
more than outweigh the array size it can be presumed that this
is beneficial for all platforms.)
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Diffstat (limited to 'libavcodec/ac3_channel_layout_tab.h')
| -rw-r--r-- | libavcodec/ac3_channel_layout_tab.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/libavcodec/ac3_channel_layout_tab.h b/libavcodec/ac3_channel_layout_tab.h new file mode 100644 index 0000000000..46fa9ecdfe --- /dev/null +++ b/libavcodec/ac3_channel_layout_tab.h @@ -0,0 +1,41 @@ +/* + * AC-3 channel layout table + * copyright (c) 2001 Fabrice Bellard + * + * 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 + */ + +#ifndef AVCODEC_AC3_CHANNEL_LAYOUT_TAB_H +#define AVCODEC_AC3_CHANNEL_LAYOUT_TAB_H + +#include <stdint.h> +#include "libavutil/channel_layout.h" + +/** + * Map audio coding mode (acmod) to channel layout mask. + */ +const uint16_t ff_ac3_channel_layout_tab[8] = { + AV_CH_LAYOUT_STEREO, + AV_CH_LAYOUT_MONO, + AV_CH_LAYOUT_STEREO, + AV_CH_LAYOUT_SURROUND, + AV_CH_LAYOUT_2_1, + AV_CH_LAYOUT_4POINT0, + AV_CH_LAYOUT_2_2, + AV_CH_LAYOUT_5POINT0 +}; +#endif |