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[ESUP-55] adds # and * support and also ability to press multiple buttons in a row #641

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merged 2 commits into from
Jul 16, 2024
Merged

[ESUP-55] adds # and * support and also ability to press multiple buttons in a row #641

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1f1f870
adds # and * support and also ability to press multiple buttons in a row
ajar98 Jul 15, 2024
d670bd0
fix tests
ajar98 Jul 16, 2024
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7 changes: 7 additions & 0 deletions vocode/streaming/utils/dtmf_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@
from vocode.streaming.utils.singleton import Singleton

DEFAULT_DTMF_TONE_LENGTH_SECONDS = 0.3
DEFAULT_DTMF_TONE_SILENCE_SECONDS = 0.1
MAX_INT = 32767


Expand All @@ -22,6 +23,8 @@ class KeypadEntry(str, Enum):
EIGHT = "8"
NINE = "9"
ZERO = "0"
POUND = "#"
STAR = "*"


DTMF_FREQUENCIES = {
Expand All @@ -35,6 +38,8 @@ class KeypadEntry(str, Enum):
KeypadEntry.EIGHT: (852, 1336),
KeypadEntry.NINE: (852, 1477),
KeypadEntry.ZERO: (941, 1336),
KeypadEntry.STAR: (941, 1209),
KeypadEntry.POUND: (941, 1477),
}


Expand All @@ -49,6 +54,7 @@ def generate(
sampling_rate: int,
audio_encoding: AudioEncoding,
duration_seconds: float = DEFAULT_DTMF_TONE_LENGTH_SECONDS,
silence_seconds: float = DEFAULT_DTMF_TONE_SILENCE_SECONDS,
) -> bytes:
if (keypad_entry, sampling_rate, audio_encoding) in self.tone_cache:
return self.tone_cache[(keypad_entry, sampling_rate, audio_encoding)]
Expand All @@ -57,6 +63,7 @@ def generate(
tone = np.sin(2 * np.pi * f1 * t) + np.sin(2 * np.pi * f2 * t)
tone = tone / np.max(np.abs(tone)) # Normalize to [-1, 1]
pcm = (tone * MAX_INT).astype(np.int16).tobytes()
pcm += b"\0" * int(silence_seconds * sampling_rate * 2)
if audio_encoding == AudioEncoding.MULAW:
output = audioop.lin2ulaw(pcm, 2)
else:
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