C++ plug-in – problem rendering audio waveforms for a growing clip

[Grassvalley]

Hi,

I’m writing a C++ plug-in for Premiere Pro CC.

I’ve based the plug-in on the example project SDK_Custom_Import, which is provided with the plug-in SDK.

In my plug-in, I’ve set the flags:

importInfo->canProvidePeakAudio = kPrTrue;

importInfo->avoidAudioConform = kPrTrue;

and

fileInfo8->accessModes |= kRandomAccessImport

This allows me to manually render the waveforms on-demand via the imGetPeakAudio case-statement.

In Premiere’s setting: Edit > Preferences > Media > Automatically refresh growing files. I have set the minimum refresh rate of 10 seconds.

I would like to import a growing, 20 minute clip with uncompressed audio at 48KHz. In my importer, I’m adding a 20 minute clip to the timeline, and back-filling video and audio as the clip grows (i.e. I’ve created a static length clip which is being slowly populated).

I can hear the audio as it is added, and I can render the waveforms correctly. My only problem is that the waveforms are not being updated/redrawn on the timeline. I was hoping that by setting the growing file refresh to 10 seconds (Edit > Preferences > Media > Automatically refresh growing files), that the timeline would automatically redraw every 10 seconds.

If I manually resize the timeline at 10 second intervals to coincide with the growing file refresh, it forces the latest audio waveforms to be redrawn, which renders the latest audio waveform growth.

Is there any code flag, or menu setting, to schedule an automatic timeline redraw at the 10 second growing file refresh interval?

Or can I amend my plug-in to force a timeline redraw at regular intervals?

Any help you can provide is much appreciated.

Many thanks, Andy.

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[Grassvalley]

Please, any pointers or advice would be very much appreciated

[Bruce Bullis]

Zac, who normally responds to such questions, is out on sabbatical. I've asked that a PPro dev respond to your enquiry, directly.

[Grassvalley]

Thanks Bruce, it is appreciated.

[Grassvalley]

Hi,

After further research, what I'm really after is a call to flush the audio-waveform cache, which will trigger case imGetPeakAudio: within xImportEntry.

I've emulated a basic timeline redraw by showing/hiding audio waveforms, and also calling ::InvalidateRect(hwnd, NULL, TRUE) with Premiere's main window handle. Both of these render cached audio waveforms.

With a growing clip, I'd like a way to refresh the audio-waveform cache via imGetPeakAudio, so timeline redraws will display the latest waveform data.

So far, the only way I've managed to achieve this is by manually resizing the timeline window via Premiere's GUI.

Many thanks, Andy.

[Grassvalley · Accepted solution]

Hi,

Issue finally fixed. I just needed to set flag fileInfo8->mayBeGrowing = 1; and now it all works.

Thanks for all your help, Andy.

[Bruce Bullis]

Great to hear!