From 062777b3436cb51c7e4908b54dc899c0a42518f7 Mon Sep 17 00:00:00 2001
From: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
Date: Sun, 14 Mar 2010 19:30:25 +0000
Subject: Allow hard-coding several QDM2 tables (about 32 kB size).

Originally committed as revision 22525 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/qdm2_tablegen.h | 101 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 libavcodec/qdm2_tablegen.h

(limited to 'libavcodec/qdm2_tablegen.h')

diff --git a/libavcodec/qdm2_tablegen.h b/libavcodec/qdm2_tablegen.h
new file mode 100644
index 0000000000..83d8c2d095
--- /dev/null
+++ b/libavcodec/qdm2_tablegen.h
@@ -0,0 +1,101 @@
+/*
+ * Header file for hardcoded QDM2 tables
+ *
+ * Copyright (c) 2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
+ *
+ * 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 QDM2_TABLEGEN_H
+#define QDM2_TABLEGEN_H
+
+#include <stdint.h>
+#include <math.h>
+
+#define SOFTCLIP_THRESHOLD 27600
+#define HARDCLIP_THRESHOLD 35716
+
+#if CONFIG_HARDCODED_TABLES
+#define softclip_table_init()
+#define rnd_table_init()
+#define init_noise_samples()
+#include "libavcodec/qdm2_tables.h"
+#else
+static uint16_t softclip_table[HARDCLIP_THRESHOLD - SOFTCLIP_THRESHOLD + 1];
+static float noise_table[4096];
+static uint8_t random_dequant_index[256][5];
+static uint8_t random_dequant_type24[128][3];
+static float noise_samples[128];
+
+static av_cold void softclip_table_init(void) {
+    int i;
+    double dfl = SOFTCLIP_THRESHOLD - 32767;
+    float delta = 1.0 / -dfl;
+    for (i = 0; i < HARDCLIP_THRESHOLD - SOFTCLIP_THRESHOLD + 1; i++)
+        softclip_table[i] = SOFTCLIP_THRESHOLD - ((int)(sin((float)i * delta) * dfl) & 0x0000FFFF);
+}
+
+
+// random generated table
+static av_cold void rnd_table_init(void) {
+    int i,j;
+    uint32_t ldw,hdw;
+    uint64_t tmp64_1;
+    uint64_t random_seed = 0;
+    float delta = 1.0 / 16384.0;
+    for(i = 0; i < 4096 ;i++) {
+        random_seed = random_seed * 214013 + 2531011;
+        noise_table[i] = (delta * (float)(((int32_t)random_seed >> 16) & 0x00007FFF)- 1.0) * 1.3;
+    }
+
+    for (i = 0; i < 256 ;i++) {
+        random_seed = 81;
+        ldw = i;
+        for (j = 0; j < 5 ;j++) {
+            random_dequant_index[i][j] = (uint8_t)((ldw / random_seed) & 0xFF);
+            ldw = (uint32_t)ldw % (uint32_t)random_seed;
+            tmp64_1 = (random_seed * 0x55555556);
+            hdw = (uint32_t)(tmp64_1 >> 32);
+            random_seed = (uint64_t)(hdw + (ldw >> 31));
+        }
+    }
+    for (i = 0; i < 128 ;i++) {
+        random_seed = 25;
+        ldw = i;
+        for (j = 0; j < 3 ;j++) {
+            random_dequant_type24[i][j] = (uint8_t)((ldw / random_seed) & 0xFF);
+            ldw = (uint32_t)ldw % (uint32_t)random_seed;
+            tmp64_1 = (random_seed * 0x66666667);
+            hdw = (uint32_t)(tmp64_1 >> 33);
+            random_seed = hdw + (ldw >> 31);
+        }
+    }
+}
+
+
+static av_cold void init_noise_samples(void) {
+    int i;
+    int random_seed = 0;
+    float delta = 1.0 / 16384.0;
+    for (i = 0; i < 128;i++) {
+        random_seed = random_seed * 214013 + 2531011;
+        noise_samples[i] = (delta * (float)((random_seed >> 16) & 0x00007fff) - 1.0);
+    }
+}
+#endif /* CONFIG_HARDCODED_TABLES */
+
+#endif /* QDM2_TABLEGEN_H */
-- 
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