#include "config.h"
#include "libavutil/attributes.h"
#include "libavutil/thread.h"
+#include "mpegaudio.h"
#include "mpegaudiodsp.h"
#include "dct.h"
#include "dct32.h"
-static AVOnce mpadsp_float_table_init = AV_ONCE_INIT;
-static AVOnce mpadsp_fixed_table_init = AV_ONCE_INIT;
+static AVOnce mpadsp_table_init = AV_ONCE_INIT;
+
+static av_cold void mpadsp_init_tabs(void)
+{
+ int i, j;
+ /* compute mdct windows */
+ for (i = 0; i < 36; i++) {
+ for (j = 0; j < 4; j++) {
+ double d;
+
+ if (j == 2 && i % 3 != 1)
+ continue;
+
+ d = sin(M_PI * (i + 0.5) / 36.0);
+ if (j == 1) {
+ if (i >= 30) d = 0;
+ else if (i >= 24) d = sin(M_PI * (i - 18 + 0.5) / 12.0);
+ else if (i >= 18) d = 1;
+ } else if (j == 3) {
+ if (i < 6) d = 0;
+ else if (i < 12) d = sin(M_PI * (i - 6 + 0.5) / 12.0);
+ else if (i < 18) d = 1;
+ }
+ //merge last stage of imdct into the window coefficients
+ d *= 0.5 * IMDCT_SCALAR / cos(M_PI * (2 * i + 19) / 72);
+
+ if (j == 2) {
+ ff_mdct_win_float[j][i/3] = d / (1 << 5);
+ ff_mdct_win_fixed[j][i/3] = d / (1 << 5) * (1LL << 32) + 0.5;
+ } else {
+ int idx = i < 18 ? i : i + (MDCT_BUF_SIZE/2 - 18);
+ ff_mdct_win_float[j][idx] = d / (1 << 5);
+ ff_mdct_win_fixed[j][idx] = d / (1 << 5) * (1LL << 32) + 0.5;
+ }
+ }
+ }
+
+ /* NOTE: we do frequency inversion after the MDCT by changing
+ the sign of the right window coefs */
+ for (j = 0; j < 4; j++) {
+ for (i = 0; i < MDCT_BUF_SIZE; i += 2) {
+ ff_mdct_win_float[j + 4][i ] = ff_mdct_win_float[j][i ];
+ ff_mdct_win_float[j + 4][i + 1] = -ff_mdct_win_float[j][i + 1];
+ ff_mdct_win_fixed[j + 4][i ] = ff_mdct_win_fixed[j][i ];
+ ff_mdct_win_fixed[j + 4][i + 1] = -ff_mdct_win_fixed[j][i + 1];
+ }
+ }
+
+ if (ARCH_X86)
+ ff_mpadsp_init_x86_tabs();
+}
av_cold void ff_mpadsp_init(MPADSPContext *s)
{
DCTContext dct;
ff_dct_init(&dct, 5, DCT_II);
- ff_thread_once(&mpadsp_float_table_init, &ff_init_mpadsp_tabs_float);
- ff_thread_once(&mpadsp_fixed_table_init, &ff_init_mpadsp_tabs_fixed);
+ ff_thread_once(&mpadsp_table_init, &mpadsp_init_tabs);
s->apply_window_float = ff_mpadsp_apply_window_float;
s->apply_window_fixed = ff_mpadsp_apply_window_fixed;