#include <math.h>
#include "libavutil/attributes.h"
-#define TABLE_4_3_SIZE (8191 + 16)*4
#if CONFIG_HARDCODED_TABLES
#define mpegaudio_tableinit()
#include "libavcodec/mpegaudio_tables.h"
#else
-static int8_t table_4_3_exp[TABLE_4_3_SIZE];
-static uint32_t table_4_3_value[TABLE_4_3_SIZE];
+#if defined(BUILD_TABLES) || !USE_FLOATS
+#define FIXED_TABLE
static uint32_t exp_table_fixed[512];
static uint32_t expval_table_fixed[512][16];
+#endif
+
+#if defined(BUILD_TABLES) || USE_FLOATS
+#define FLOAT_TABLE
static float exp_table_float[512];
static float expval_table_float[512][16];
+#endif
-#define FRAC_BITS 23
#define IMDCT_SCALAR 1.759
static av_cold void mpegaudio_tableinit(void)
M_SQRT2 , /* 2 ^ (2 * 0.25) */
1.68179283050742908606, /* 2 ^ (3 * 0.25) */
};
- static double pow43_lut[16];
+ double pow43_lut[16];
double exp2_base = 2.11758236813575084767080625169910490512847900390625e-22; // 2^(-72)
double exp2_val;
- double pow43_val = 0;
+
for (i = 0; i < 16; ++i)
pow43_lut[i] = i * cbrt(i);
- for (i = 1; i < TABLE_4_3_SIZE; i++) {
- double f, fm;
- int e, m;
- double value = i / 4;
- if ((i & 3) == 0)
- pow43_val = value / IMDCT_SCALAR * cbrt(value);
- f = pow43_val * exp2_lut[i & 3];
- fm = frexp(f, &e);
- m = llrint(fm * (1LL << 31));
- e += FRAC_BITS - 31 + 5 - 100;
-
- /* normalized to FRAC_BITS */
- table_4_3_value[i] = m;
- table_4_3_exp[i] = -e;
- }
for (exponent = 0; exponent < 512; exponent++) {
if (exponent && (exponent & 3) == 0)
exp2_base *= 2;
exp2_val = exp2_base * exp2_lut[exponent & 3] / IMDCT_SCALAR;
for (value = 0; value < 16; value++) {
double f = pow43_lut[value] * exp2_val;
+#ifdef FIXED_TABLE
expval_table_fixed[exponent][value] = (f < 0xFFFFFFFF ? llrint(f) : 0xFFFFFFFF);
+#endif
+#ifdef FLOAT_TABLE
expval_table_float[exponent][value] = f;
+#endif
}
+#ifdef FIXED_TABLE
exp_table_fixed[exponent] = expval_table_fixed[exponent][1];
+#endif
+#ifdef FLOAT_TABLE
exp_table_float[exponent] = expval_table_float[exponent][1];
+#endif
}
}
+#undef FLOAT_TABLE
+#undef FIXED_TABLE
#endif /* CONFIG_HARDCODED_TABLES */
#endif /* AVCODEC_MPEGAUDIO_TABLEGEN_H */