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authorJustin Ruggles <justin.ruggles@gmail.com>2009-09-27 04:07:49 +0000
committerJustin Ruggles <justin.ruggles@gmail.com>2009-09-27 04:07:49 +0000
commitb05e4195d44f6325a6450f002dd52b3d700e031e (patch)
tree23c73baa309d75a987d51841f148a05f324e795e /libavcodec/ac3.c
parent7087a0f525f26208db7b3e11fbdcb0508033c7f2 (diff)
downloadffmpeg-b05e4195d44f6325a6450f002dd52b3d700e031e.tar.gz
Hardcode AC-3 critical band tables when CONFIG_HARDCODED_TABLES is set.
Originally committed as revision 20036 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/ac3.c')
-rw-r--r--libavcodec/ac3.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/libavcodec/ac3.c b/libavcodec/ac3.c
index 84862c69e9..85ec2b719d 100644
--- a/libavcodec/ac3.c
+++ b/libavcodec/ac3.c
@@ -28,8 +28,51 @@
#include "ac3.h"
#include "get_bits.h"
+#if CONFIG_HARDCODED_TABLES
+
+/**
+ * Starting frequency coefficient bin for each critical band.
+ */
+static const uint8_t band_start_tab[51] = {
+ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
+ 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
+ 20, 21, 22, 23, 24, 25, 26, 27, 28, 31,
+ 34, 37, 40, 43, 46, 49, 55, 61, 67, 73,
+ 79, 85, 97, 109, 121, 133, 157, 181, 205, 229, 253
+};
+
+/**
+ * Maps each frequency coefficient bin to the critical band that contains it.
+ */
+static const uint8_t bin_to_band_tab[253] = {
+ 0,
+ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,
+ 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
+ 25, 26, 27, 28, 28, 28, 29, 29, 29, 30, 30, 30,
+ 31, 31, 31, 32, 32, 32, 33, 33, 33, 34, 34, 34,
+ 35, 35, 35, 35, 35, 35, 36, 36, 36, 36, 36, 36,
+ 37, 37, 37, 37, 37, 37, 38, 38, 38, 38, 38, 38,
+ 39, 39, 39, 39, 39, 39, 40, 40, 40, 40, 40, 40,
+ 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41,
+ 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42,
+ 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43,
+ 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44,
+ 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45,
+ 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45,
+ 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46,
+ 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46,
+ 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47,
+ 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47,
+ 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48,
+ 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48,
+ 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49,
+ 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49
+};
+
+#else /* CONFIG_HARDCODED_TABLES */
static uint8_t band_start_tab[51];
static uint8_t bin_to_band_tab[253];
+#endif
static inline int calc_lowcomp1(int a, int b0, int b1, int c)
{
@@ -232,6 +275,7 @@ void ac3_parametric_bit_allocation(AC3BitAllocParameters *s, uint8_t *bap,
*/
av_cold void ac3_common_init(void)
{
+#if !CONFIG_HARDCODED_TABLES
int i, j, k, l, v;
/* compute bndtab and masktab from bandsz */
k = 0;
@@ -243,4 +287,5 @@ av_cold void ac3_common_init(void)
l += v;
}
band_start_tab[50] = l;
+#endif /* !CONFIG_HARDCODED_TABLES */
}