1 files changed, 113 insertions, 0 deletions
diff --git a/media/ffvpx/libavcodec/mpegaudiodsp.c b/media/ffvpx/libavcodec/mpegaudiodsp.c
new file mode 100644
index 0000000000..5a5a679d91
--- /dev/null
+++ b/media/ffvpx/libavcodec/mpegaudiodsp.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright (c) 2011 Mans Rullgard
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#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_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();
+#endif
+}
+
+av_cold void ff_mpadsp_init(MPADSPContext *s)
+{
+    DCTContext dct;
+
+    ff_dct_init(&dct, 5, DCT_II);
+    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;
+
+    s->dct32_float = dct.dct32;
+    s->dct32_fixed = ff_dct32_fixed;
+
+    s->imdct36_blocks_float = ff_imdct36_blocks_float;
+    s->imdct36_blocks_fixed = ff_imdct36_blocks_fixed;
+
+#if ARCH_AARCH64
+    ff_mpadsp_init_aarch64(s);
+#elif ARCH_ARM
+    ff_mpadsp_init_arm(s);
+#elif ARCH_PPC
+    ff_mpadsp_init_ppc(s);
+#elif ARCH_X86
+    ff_mpadsp_init_x86(s);
+#endif
+#if HAVE_MIPSFPU
+    ff_mpadsp_init_mipsfpu(s);
+#endif
+#if HAVE_MIPSDSP
+    ff_mpadsp_init_mipsdsp(s);
+#endif
+}