virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2025-08-10 06:10:52 +02:00
Code Issues Releases Activity

avcodec/dca_lbr: Hardcode lpc table to save space

Browse Source 
The code to initialize it takes more space (in .text) than
the table to be initialized (namely 86B vs 64B for GCC 11.2
with -O3 in an av_cold function), so hardcode the table.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt
2022-09-12 22:24:04 +02:00
parent 465e27e0f2
commit 62d9b1195a
1 changed files with 11 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
libavcodec/dca_lbr.c
View File

@@ -119,7 +119,17 @@ static const uint16_t channel_layouts[7] = {
}; };
static float cos_tab[256]; static float cos_tab[256];
static float lpc_tab[16]; static const float lpc_tab[16] = {
/* lpc_tab[i] = sin((i - 8) * (M_PI / ((i < 8) ? 17 : 15))) */
-0.995734176295034521871191178905, -0.961825643172819070408796290732,
-0.895163291355062322067016499754, -0.798017227280239503332805112796,
-0.673695643646557211712691912426, -0.526432162877355800244607799141,
-0.361241666187152948744714596184, -0.183749517816570331574408839621,
0.0, 0.207911690817759337101742284405,
0.406736643075800207753985990341, 0.587785252292473129168705954639,
0.743144825477394235014697048974, 0.866025403784438646763723170753,
0.951056516295153572116439333379, 0.994521895368273336922691944981
};
av_cold void ff_dca_lbr_init_tables(void) av_cold void ff_dca_lbr_init_tables(void)
{ {
@@ -127,9 +137,6 @@ av_cold void ff_dca_lbr_init_tables(void)
for (i = 0; i < 256; i++) for (i = 0; i < 256; i++)
cos_tab[i] = cos(M_PI * i / 128); cos_tab[i] = cos(M_PI * i / 128);
for (i = 0; i < 16; i++)
lpc_tab[i] = sin((i - 8) * (M_PI / ((i < 8) ? 17 : 15)));
} }
static int parse_lfe_24(DCALbrDecoder *s) static int parse_lfe_24(DCALbrDecoder *s)