* @author Maxim Gavrilov ( maxim.gavrilov gmail com )
*/
+#include "config.h"
#include "libavutil/mem.h"
+#include "libavutil/mem_internal.h"
+#include "libavutil/thread.h"
#include "aac.h"
+#include "aactab.h"
#include <stdint.h>
float ff_aac_pow2sf_tab[428];
float ff_aac_pow34sf_tab[428];
+#if CONFIG_AAC_ENCODER || CONFIG_AAC_DECODER
+#include "kbdwin.h"
+#include "sinewin.h"
+
DECLARE_ALIGNED(32, float, ff_aac_kbd_long_1024)[1024];
DECLARE_ALIGNED(32, float, ff_aac_kbd_short_128)[128];
-DECLARE_ALIGNED(32, float, ff_aac_kbd_long_960)[960];
-DECLARE_ALIGNED(32, float, ff_aac_kbd_short_120)[120];
-DECLARE_ALIGNED(32, int, ff_aac_kbd_long_1024_fixed)[1024];
-DECLARE_ALIGNED(32, int, ff_aac_kbd_short_128_fixed)[128];
+
+static av_cold void aac_float_common_init(void)
+{
+ ff_kbd_window_init(ff_aac_kbd_long_1024, 4.0, 1024);
+ ff_kbd_window_init(ff_aac_kbd_short_128, 6.0, 128);
+ ff_init_ff_sine_windows(10);
+ ff_init_ff_sine_windows(7);
+}
+
+av_cold void ff_aac_float_common_init(void)
+{
+ static AVOnce init_static_once = AV_ONCE_INIT;
+ ff_thread_once(&init_static_once, aac_float_common_init);
+}
+#endif
const uint8_t ff_aac_num_swb_1024[] = {
41, 41, 47, 49, 49, 51, 47, 47, 43, 43, 43, 40, 40
0xffecff1c, 0xffed391e, 0xffed740c, 0xffedafb1,
0xffedebe1, 0xffee287d, 0xffee654e, 0xffeea23f,
};
+
+static void aac_tableinit(void)
+{
+ /* 2^(i/16) for 0 <= i <= 15 */
+ static const float exp2_lut[] = {
+ 1.00000000000000000000,
+ 1.04427378242741384032,
+ 1.09050773266525765921,
+ 1.13878863475669165370,
+ 1.18920711500272106672,
+ 1.24185781207348404859,
+ 1.29683955465100966593,
+ 1.35425554693689272830,
+ 1.41421356237309504880,
+ 1.47682614593949931139,
+ 1.54221082540794082361,
+ 1.61049033194925430818,
+ 1.68179283050742908606,
+ 1.75625216037329948311,
+ 1.83400808640934246349,
+ 1.91520656139714729387,
+ };
+ float t1 = 8.8817841970012523233890533447265625e-16; // 2^(-50)
+ float t2 = 3.63797880709171295166015625e-12; // 2^(-38)
+ int t1_inc_cur, t2_inc_cur;
+ int t1_inc_prev = 0;
+ int t2_inc_prev = 8;
+
+ for (int i = 0; i < 428; i++) {
+ t1_inc_cur = 4 * (i % 4);
+ t2_inc_cur = (8 + 3*i) % 16;
+ if (t1_inc_cur < t1_inc_prev)
+ t1 *= 2;
+ if (t2_inc_cur < t2_inc_prev)
+ t2 *= 2;
+ // A much more efficient and accurate way of doing:
+ // ff_aac_pow2sf_tab[i] = pow(2, (i - POW_SF2_ZERO) / 4.0);
+ // ff_aac_pow34sf_tab[i] = pow(ff_aac_pow2sf_tab[i], 3.0/4.0);
+ ff_aac_pow2sf_tab[i] = t1 * exp2_lut[t1_inc_cur];
+ ff_aac_pow34sf_tab[i] = t2 * exp2_lut[t2_inc_cur];
+ t1_inc_prev = t1_inc_cur;
+ t2_inc_prev = t2_inc_cur;
+ }
+}
+
+void ff_aac_tableinit(void)
+{
+ static AVOnce init_static_once = AV_ONCE_INIT;
+ ff_thread_once(&init_static_once, aac_tableinit);
+}