From 80e92d1cab560f77900f66a002e54ccc9a59d424 Mon Sep 17 00:00:00 2001
From: Anthony Wang <a@exozy.me>
Date: Mon, 3 Oct 2022 18:12:57 -0400
Subject: [PATCH] Commit all testing programs

---
 beepemu            |  8 ++------
 beepemu-pyaudio    | 46 +++++++++++++++++++++++++++++++++++++++++++++
 beepemu-pysinewave | 30 +++++++++++++++++++++++++++++
 beepemu-sox        | 26 +++++++++++++++++++++++++
 test.py            | 47 ++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 151 insertions(+), 6 deletions(-)
 create mode 100755 beepemu-pyaudio
 create mode 100755 beepemu-pysinewave
 create mode 100755 beepemu-sox
 create mode 100644 test.py

diff --git a/beepemu b/beepemu
index b74d197..6fb9487 100755
--- a/beepemu
+++ b/beepemu
@@ -1,9 +1,8 @@
 #!/usr/bin/python
 
-import math
+import os
 import sys
 import time
-from pysinewave import SineWave
 
 i = 1
 f = 0
@@ -20,11 +19,8 @@ while i < len(sys.argv):
         time.sleep(float(sys.argv[i])/1000)
     if f != 0 and l != 0:
         print(f, l)
-        s = SineWave(pitch_per_second=1000)
-        s.set_frequency(f)
-        s.play()
+        os.system(f'play -n synth {l} sawtooth {f} &')
         time.sleep(l)
-        s.stop()
         f = 0
         l = 0
     i += 1
diff --git a/beepemu-pyaudio b/beepemu-pyaudio
new file mode 100755
index 0000000..f0d3347
--- /dev/null
+++ b/beepemu-pyaudio
@@ -0,0 +1,46 @@
+#!/usr/bin/python
+
+import math
+import os
+import sys
+import time
+import pyaudio
+
+p = pyaudio.PyAudio()
+sample_rate=44100
+stream = p.open(
+    format=pyaudio.paInt16,
+    channels=1,
+    rate=sample_rate,
+    output=True
+)
+stream.start_stream()
+
+i = 1
+f = 0
+l = 0
+while i < len(sys.argv):
+    if sys.argv[i] == '-f':
+        i += 1
+        f = float(sys.argv[i])
+    elif sys.argv[i] == '-l':
+        i += 1
+        l = float(sys.argv[i])/1000
+    elif sys.argv[i] == '-D':
+        i += 1
+        time.sleep(float(sys.argv[i])/1000)
+    if f != 0 and l != 0:
+        print(f, l)
+        # https://stackoverflow.com/questions/974071/python-library-for-playing-fixed-frequency-sound
+        num_samples = int(sample_rate * l)
+        rest_frames = num_samples % sample_rate
+        s = lambda i: 0.25 * math.sin(2 * math.pi * f * i / sample_rate)
+        samples = (int(s(i) * 0x7F + 0x80) for i in range(num_samples))
+        # write several samples at a time
+        for buf in zip( *([samples] * sample_rate) ):
+            stream.write(bytes(buf))
+        # fill remainder of frameset with silence
+        stream.write(b'\x80' * rest_frames)
+        f = 0
+        l = 0
+    i += 1
diff --git a/beepemu-pysinewave b/beepemu-pysinewave
new file mode 100755
index 0000000..b74d197
--- /dev/null
+++ b/beepemu-pysinewave
@@ -0,0 +1,30 @@
+#!/usr/bin/python
+
+import math
+import sys
+import time
+from pysinewave import SineWave
+
+i = 1
+f = 0
+l = 0
+while i < len(sys.argv):
+    if sys.argv[i] == '-f':
+        i += 1
+        f = float(sys.argv[i])
+    elif sys.argv[i] == '-l':
+        i += 1
+        l = float(sys.argv[i])/1000
+    elif sys.argv[i] == '-D':
+        i += 1
+        time.sleep(float(sys.argv[i])/1000)
+    if f != 0 and l != 0:
+        print(f, l)
+        s = SineWave(pitch_per_second=1000)
+        s.set_frequency(f)
+        s.play()
+        time.sleep(l)
+        s.stop()
+        f = 0
+        l = 0
+    i += 1
diff --git a/beepemu-sox b/beepemu-sox
new file mode 100755
index 0000000..6fb9487
--- /dev/null
+++ b/beepemu-sox
@@ -0,0 +1,26 @@
+#!/usr/bin/python
+
+import os
+import sys
+import time
+
+i = 1
+f = 0
+l = 0
+while i < len(sys.argv):
+    if sys.argv[i] == '-f':
+        i += 1
+        f = float(sys.argv[i])
+    elif sys.argv[i] == '-l':
+        i += 1
+        l = float(sys.argv[i])/1000
+    elif sys.argv[i] == '-D':
+        i += 1
+        time.sleep(float(sys.argv[i])/1000)
+    if f != 0 and l != 0:
+        print(f, l)
+        os.system(f'play -n synth {l} sawtooth {f} &')
+        time.sleep(l)
+        f = 0
+        l = 0
+    i += 1
diff --git a/test.py b/test.py
new file mode 100644
index 0000000..2849213
--- /dev/null
+++ b/test.py
@@ -0,0 +1,47 @@
+import math
+from pyaudio import PyAudio, paUInt8
+
+def generate_sine_wave(frequency, duration, volume=0.2, sample_rate=22050):
+    ''' Generate a tone at the given frequency.
+
+        Limited to unsigned 8-bit samples at a given sample_rate.
+        The sample rate should be at least double the frequency.
+    '''
+    if sample_rate < (frequency * 2):
+        print('Warning: sample_rate must be at least double the frequency '
+              f'to accurately represent it:\n    sample_rate {sample_rate}'
+              f' ≯ {frequency*2} (frequency {frequency}*2)')
+
+    num_samples = int(sample_rate * duration)
+    rest_frames = num_samples % sample_rate
+
+    pa = PyAudio()
+    stream = pa.open(
+        format=paUInt8,
+        channels=1,  # mono
+        rate=sample_rate,
+        output=True,
+    )
+
+    # make samples
+    s = lambda i: volume * math.sin(2 * math.pi * frequency * i / sample_rate)
+    samples = (int(s(i) * 0x7F + 0x80) for i in range(num_samples))
+
+    # write several samples at a time
+    for buf in zip( *([samples] * sample_rate) ):
+        stream.write(bytes(buf))
+
+    # fill remainder of frameset with silence
+    stream.write(b'\x80' * rest_frames)
+
+    stream.stop_stream()
+    stream.close()
+    pa.terminate()
+
+generate_sine_wave(
+    # see http://www.phy.mtu.edu/~suits/notefreqs.html
+    frequency=440,   # Hz, waves per second C6
+    duration=0.2,       # seconds to play sound
+    volume=0.25,        # 0..1 how loud it is
+    sample_rate=44100,  # number of samples per second: 11025, 22050, 44100
+)