23 #ifndef AVCODEC_MPEGAUDIO_TABLEGEN_H 24 #define AVCODEC_MPEGAUDIO_TABLEGEN_H 30 #if CONFIG_HARDCODED_TABLES 31 #define mpegaudio_tableinit() 32 #include "libavcodec/mpegaudio_tables.h" 34 #if defined(BUILD_TABLES) || !USE_FLOATS 40 #if defined(BUILD_TABLES) || USE_FLOATS 42 static float exp_table_float[512];
43 static float expval_table_float[512][16];
46 #define IMDCT_SCALAR 1.759 51 static const double exp2_lut[4] = {
52 1.00000000000000000000,
53 1.18920711500272106672,
55 1.68179283050742908606,
58 double exp2_base = 2.11758236813575084767080625169910490512847900390625e-22;
61 for (i = 0; i < 16; ++
i)
62 pow43_lut[i] = i *
cbrt(i);
64 for (exponent = 0; exponent < 512; exponent++) {
65 if (exponent && (exponent & 3) == 0)
67 exp2_val = exp2_base * exp2_lut[exponent & 3] /
IMDCT_SCALAR;
68 for (value = 0; value < 16; value++) {
69 double f = pow43_lut[
value] * exp2_val;
74 expval_table_float[exponent][
value] =
f;
81 exp_table_float[exponent] = expval_table_float[exponent][1];
Macro definitions for various function/variable attributes.
GLsizei GLboolean const GLfloat * value
static av_cold void mpegaudio_tableinit(void)
static uint32_t expval_table_fixed[512][16]
static uint32_t exp_table_fixed[512]