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Add node: JoinAudioChannels (#11728)

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Jukka Seppänen 2026-01-09 05:14:06 +02:00 committed by GitHub
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commit 027042db68
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comfy_extras/nodes_audio.py
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@ -399,6 +399,58 @@ class SplitAudioChannels(IO.ComfyNode):
separate = execute # TODO: remove
class JoinAudioChannels(IO.ComfyNode):
@classmethod
def define_schema(cls):
return IO.Schema(
node_id="JoinAudioChannels",
display_name="Join Audio Channels",
description="Joins left and right mono audio channels into a stereo audio.",
category="audio",
inputs=[
IO.Audio.Input("audio_left"),
IO.Audio.Input("audio_right"),
],
outputs=[
IO.Audio.Output(display_name="audio"),
],
)
@classmethod
def execute(cls, audio_left, audio_right) -> IO.NodeOutput:
waveform_left = audio_left["waveform"]
sample_rate_left = audio_left["sample_rate"]
waveform_right = audio_right["waveform"]
sample_rate_right = audio_right["sample_rate"]
if waveform_left.shape[1] != 1 or waveform_right.shape[1] != 1:
raise ValueError("AudioJoin: Both input audios must be mono.")
# Handle different sample rates by resampling to the higher rate
waveform_left, waveform_right, output_sample_rate = match_audio_sample_rates(
waveform_left, sample_rate_left, waveform_right, sample_rate_right
)
# Handle different lengths by trimming to the shorter length
length_left = waveform_left.shape[-1]
length_right = waveform_right.shape[-1]
if length_left != length_right:
min_length = min(length_left, length_right)
if length_left > min_length:
logging.info(f"JoinAudioChannels: Trimming left channel from {length_left} to {min_length} samples.")
waveform_left = waveform_left[..., :min_length]
if length_right > min_length:
logging.info(f"JoinAudioChannels: Trimming right channel from {length_right} to {min_length} samples.")
waveform_right = waveform_right[..., :min_length]
# Join the channels into stereo
left_channel = waveform_left[..., 0:1, :]
right_channel = waveform_right[..., 0:1, :]
stereo_waveform = torch.cat([left_channel, right_channel], dim=1)
return IO.NodeOutput({"waveform": stereo_waveform, "sample_rate": output_sample_rate})
def match_audio_sample_rates(waveform_1, sample_rate_1, waveform_2, sample_rate_2):
if sample_rate_1 != sample_rate_2:
@ -616,6 +668,7 @@ class AudioExtension(ComfyExtension):
RecordAudio,
TrimAudioDuration,
SplitAudioChannels,
JoinAudioChannels,
AudioConcat,
AudioMerge,
AudioAdjustVolume,