From 7a60aece502ec5a6396615432db7bd10d60e07ee Mon Sep 17 00:00:00 2001
From: Carl Hetherington <cth@carlh.net>
Date: Thu, 9 Jul 2020 01:22:23 +0200
Subject: Some ATMOS hacks.

---
 hacks/atmos/extract.sh |   2 +
 hacks/atmos/parse.py   | 112 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 114 insertions(+)
 create mode 100755 hacks/atmos/extract.sh
 create mode 100755 hacks/atmos/parse.py

diff --git a/hacks/atmos/extract.sh b/hacks/atmos/extract.sh
new file mode 100755
index 000000000..eefb6d066
--- /dev/null
+++ b/hacks/atmos/extract.sh
@@ -0,0 +1,2 @@
+#!/bin/bash
+sox ~/DCP/Examples/atmos_channel_14.wav -t s32 - | od -t d4 -w4 -v | awk '{print $2}'
diff --git a/hacks/atmos/parse.py b/hacks/atmos/parse.py
new file mode 100755
index 000000000..e43af2879
--- /dev/null
+++ b/hacks/atmos/parse.py
@@ -0,0 +1,112 @@
+#!/usr/bin/python3
+#
+# assuming 48kHz
+
+import sys
+from enum import Enum
+
+samples = []
+with open('ints', 'r') as f:
+    for l in f.readlines():
+        l = l.strip()
+        if l == "":
+            continue
+        x = float(l) / pow(2, 31)
+        if abs(x - 0.038) < 0.002:
+            samples.append(1)
+        elif abs(x - 0.092) < 0.002:
+            samples.append(2)
+        elif abs(x + 0.092) < 0.002:
+            samples.append(3)
+        elif abs(x + 0.038) < 0.002:
+            samples.append(4)
+        elif abs(x - 0.071) < 0.002:
+            samples.append(5)
+        elif abs(x + 0.071) < 0.002:
+            samples.append(6)
+        else:
+            print("Unknown sample %f" % x)
+            sys.exit(1)
+
+
+class State(Enum):
+    QUIESCENT = 0
+    GOT_SYNC_FIRST = 1
+    GOT_SYNC = 2
+    AWAIT_UUID_SUB0 = 3
+    AWAIT_UUID_SUB1 = 4
+    AWAIT_UUID_SUB2 = 5
+    AWAIT_UUID_SUB3 = 6
+    AWAIT_EUI0 = 7
+    AWAIT_EUI1 = 8
+    AWAIT_EUI2 = 9
+    AWAIT_CRC0 = 10
+    AWAIT_CRC1 = 11
+    AWAIT_REMBITS = 12
+
+i = 0
+bits = []
+while True:
+    four = samples[i:i+4]
+    if four == [1, 2, 2, 1] or four == [4, 3, 3, 4]:
+        bits.append(0)
+    elif four == [5, 5, 6, 6] or four == [6, 6, 5, 5]:
+        bits.append(1)
+    elif len(four) == 0:
+        break
+    else:
+        print("Unknown symbol %s" % four)
+        sys.exit(1)
+    i += 4
+
+
+def to_int(bits):
+    i = 0
+    for b in bits:
+        i = i << 1
+        if b:
+            i |= 1
+    return i
+
+
+i = 0
+while True:
+    sync_word = to_int(bits[i:i+16])
+    if sync_word == 0x4d56:
+        print("Sync")
+    else:
+        print("Out of sync")
+    i += 16
+
+    edit_rate = to_int(bits[i:i+4])
+    if edit_rate == 0:
+        print("24fps")
+    else:
+        print("Unknown edit rate")
+    i += 4
+
+    # Reserved
+    i += 2
+
+    print("UUID sub index: %d" % to_int(bits[i:i+2]))
+    i += 2
+
+    print("UUID sub: %8x" % to_int(bits[i:i+32]))
+    i += 32
+
+    # Edit unit index
+    print("Edit unit index: %d" % to_int(bits[i:i+24]))
+    i += 24
+
+    # CRC
+    i += 16
+
+    # Reserved
+    i += 4
+
+    # RemBits
+    if edit_rate == 0:
+        i += 25
+
+
+
-- 
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