Adding upstream version 110.0.1.upstream/110.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 72 insertions, 0 deletions

diff --git a/media/ffvpx/libavcodec/mpegaudiodec_common_tablegen.h b/media/ffvpx/libavcodec/mpegaudiodec_common_tablegen.h
new file mode 100644
index 0000000000..bf402c9d84
--- /dev/null
+++ b/media/ffvpx/libavcodec/mpegaudiodec_common_tablegen.h
@@ -0,0 +1,72 @@
+/*
+ * Header file for hardcoded shared mpegaudiodec tables
+ *
+ * Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
+ * Copyright (c) 2020 Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
+ *
+ * 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
+ */
+
+#ifndef AVCODEC_MPEGAUDIODEC_COMMON_TABLEGEN_H
+#define AVCODEC_MPEGAUDIODEC_COMMON_TABLEGEN_H
+
+#include <stdint.h>
+
+#define TABLE_4_3_SIZE ((8191 + 16)*4)
+
+#if CONFIG_HARDCODED_TABLES
+#define mpegaudiodec_common_tableinit()
+#include "libavcodec/mpegaudiodec_common_tables.h"
+#else
+#include <math.h>
+#include "libavutil/attributes.h"
+
+int8_t   ff_table_4_3_exp  [TABLE_4_3_SIZE];
+uint32_t ff_table_4_3_value[TABLE_4_3_SIZE];
+
+#define FRAC_BITS 23
+#define IMDCT_SCALAR 1.759
+
+static av_cold void mpegaudiodec_common_tableinit(void)
+{
+    static const double exp2_lut[4] = {
+        1.00000000000000000000, /* 2 ^ (0 * 0.25) */
+        1.18920711500272106672, /* 2 ^ (1 * 0.25) */
+        M_SQRT2               , /* 2 ^ (2 * 0.25) */
+        1.68179283050742908606, /* 2 ^ (3 * 0.25) */
+    };
+    double pow43_val = 0;
+
+    for (int 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 */
+        ff_table_4_3_value[i] =  m;
+        ff_table_4_3_exp  [i] = -e;
+    }
+}
+
+#endif /* CONFIG_HARDCODED_TABLES */
+#endif /* AVCODEC_MPEGAUDIODEC_COMMON_TABLEGEN_H */