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avcodec/ac3tab: Unavpriv ac3_channel_layout_tab

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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>
This commit is contained in:
Andreas Rheinhardt
2021-02-09 18:25:13 +01:00
parent 3d53cefb49
commit d7a75d2163
13 changed files with 107 additions and 27 deletions
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4
libavformat/hls_sample_encryption.c
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@@ -26,6 +26,8 @@
* https://developer.apple.com/library/ios/documentation/AudioVideo/Conceptual/HLS_Sample_Encryption
*/
#include "libavutil/channel_layout.h"
#include "hls_sample_encryption.h"
#include "libavcodec/adts_header.h"
@@ -129,7 +131,7 @@ int ff_hls_senc_parse_audio_setup_info(AVStream *st, HLSAudioSetupInfo *info)
st->codecpar->sample_rate = eac3_sample_rate_tab[fscod];
st->codecpar->channel_layout = avpriv_ac3_channel_layout_tab[acmod];
st->codecpar->channel_layout = ff_ac3_channel_layout_tab[acmod];
if (lfeon)
st->codecpar->channel_layout |= AV_CH_LOW_FREQUENCY;