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avcodec/ac3: always use hardcoded tables

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The table in question is a 253 byte one. In fact, it turns out that
dynamic generation of the table results in an increased binary size.

Code compiled with GCC 5.2.0, x86-64 (size in bytes), before and after
patch:
old: 62321064 libavcodec/libavcodec.so.57
new: 62320536 libavcodec/libavcodec.so.57

Thus, it always make sense to statically allocate this.

Tested with FATE with/without --enable-hardcoded-tables.

Reviewed-by: wm4 <nfxjfg@googlemail.com>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
This commit is contained in:
Ganesh Ajjanagadde 2015-11-29 20:15:27 -05:00
parent 5a41a5a4f5
commit 7b11eead1b
4 changed files with 1 additions and 34 deletions
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24
libavcodec/ac3.c
View File

@ -39,8 +39,6 @@ const uint8_t ff_ac3_band_start_tab[AC3_CRITICAL_BANDS+1] = {
79, 85, 97, 109, 121, 133, 157, 181, 205, 229, 253
};
#if CONFIG_HARDCODED_TABLES
/**
* Map each frequency coefficient bin to the critical band that contains it.
*/
@ -69,10 +67,6 @@ const uint8_t ff_ac3_bin_to_band_tab[253] = {
49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49
};
#else /* CONFIG_HARDCODED_TABLES */
uint8_t ff_ac3_bin_to_band_tab[253];
#endif
static inline int calc_lowcomp1(int a, int b0, int b1, int c)
{
if ((b0 + 256) == b1) {
@ -214,21 +208,3 @@ int ff_ac3_bit_alloc_calc_mask(AC3BitAllocParameters *s, int16_t *band_psd,
}
return 0;
}
/**
* Initialize some tables.
* note: This function must remain thread safe because it is called by the
* AVParser init code.
*/
av_cold void ff_ac3_common_init(void)
{
#if !CONFIG_HARDCODED_TABLES
/* compute ff_ac3_bin_to_band_tab from ff_ac3_band_start_tab */
int bin = 0, band;
for (band = 0; band < AC3_CRITICAL_BANDS; band++) {
int band_end = ff_ac3_band_start_tab[band+1];
while (bin < band_end)
ff_ac3_bin_to_band_tab[bin++] = band;
}
#endif /* !CONFIG_HARDCODED_TABLES */
}

1
libavcodec/ac3dec.c
View File

@ -185,7 +185,6 @@ static av_cold int ac3_decode_init(AVCodecContext *avctx)
s->avctx = avctx;
ff_ac3_common_init();
ac3_tables_init();
ff_mdct_init(&s->imdct_256, 8, 1, 1.0);
ff_mdct_init(&s->imdct_512, 9, 1, 1.0);

2
libavcodec/ac3enc.c
View File

@ -2431,8 +2431,6 @@ av_cold int ff_ac3_encode_init(AVCodecContext *avctx)
s->eac3 = avctx->codec_id == AV_CODEC_ID_EAC3;
ff_ac3_common_init();
ret = validate_options(s);
if (ret)
return ret;

8
libavcodec/ac3tab.h
View File

@ -27,12 +27,6 @@
#include "libavutil/internal.h"
#include "ac3.h"
#if CONFIG_HARDCODED_TABLES
# define HCONST const
#else
# define HCONST
#endif
extern const uint16_t ff_ac3_frame_size_tab[38][3];
extern const uint8_t ff_ac3_channels_tab[8];
extern av_export const uint16_t avpriv_ac3_channel_layout_tab[8];
@ -54,7 +48,7 @@ extern const int16_t ff_ac3_floor_tab[8];
extern const uint16_t ff_ac3_fast_gain_tab[8];
extern const uint16_t ff_eac3_default_chmap[8];
extern const uint8_t ff_ac3_band_start_tab[AC3_CRITICAL_BANDS+1];
extern HCONST uint8_t ff_ac3_bin_to_band_tab[253];
extern const uint8_t ff_ac3_bin_to_band_tab[253];
/** Custom channel map locations bitmask
* Other channels described in documentation: