summaryrefslogtreecommitdiffstats
path: root/media/ffvpx/libavcodec/mpegaudiodec_common_tablegen.h
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
commit36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree105e8c98ddea1c1e4784a60a5a6410fa416be2de /media/ffvpx/libavcodec/mpegaudiodec_common_tablegen.h
parentInitial commit. (diff)
downloadfirefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz
firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--media/ffvpx/libavcodec/mpegaudiodec_common_tablegen.h72
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 */