waveform and bar graph of multi channel not rendered correctly

[JMZiem]

Bug description

Wavesurfe is unable to render 3+ multi channel peaks, pre-defined or loaded via audio with bar mode and wave form.
Reason: at render.ts you expect that any audio stream might only consist of one or two channels, containing an one or two dimensional array of elements per channel. There are several places at render.ts where you just admit it's one or two channel.

Details:
At our side we deal with large audio files (>2gb) downsampled to stereo for streaming purposes, but we deliver a histogram of the original with all channels (simle picture) and also a pre-calculated channel representation of the original. This is crucial for multi channel / binaural audio.

Environment

• Browser: Any
• extracted peak data of an THX example or any other multi channel audio.

Minimal code snippet

renderer.ts -> renderLineWaveform. drawChannel(0), drawChannel(1).

Expected result

If multiple channels are submitted, all channels should be rendered perfectly. At spectrogram everything works as expected, only bar and wave form don't.

Obtained result

only one or two channels are rendered, the rest is going to be ignored, esp. at bar rendering mode.

Screenshots

not relevant.

[katspaugh]

Have you tried the splitChannel option?

[JMZiem]

Yes.
I manually fixed that for our little test, but still there are some bugs regarding the visibility.

Example waveform shape attached.
example_waveform_shape.json