Integrate Bungee with Juce

General JUCE discussion
1

Hi, has anyone successfully integrated the Bungee pitch shifter library into their JUCE project? They provided a working example, but it’s for a command line case. I’ve tried to make it work, but there’s no output audio:

auto buffer = bufferToFill.buffer;
    auto sampleCount = buffer->getNumSamples();
    auto writePtr = buffer->getArrayOfWritePointers();
    auto readPtr = buffer->getArrayOfReadPointers();
    auto pushFrameCount = processSpec->maximumBlockSize;

    InputChunk inputChunk = stretcher1->specifyGrain(stretcherRequest);
    Push::InputBuffer pushInputBuffer(stretcher1->maxInputFrameCount() + pushFrameCount, processSpec->numChannels);
    pushInputBuffer.grain(inputChunk);

    int position = 0;
    while (position < sampleCount)
    {
        // Get the next block of audio
        mixerSource.getNextAudioBlock(bufferToFill);

        // Copy data to pushInputBuffer
        int framesToCopy = std::min(static_cast<int>(pushFrameCount), sampleCount - position);
        float* inputData = pushInputBuffer.inputData();
        for (int c = 0; c < processSpec->numChannels; ++c)
        {
            for (int i = 0; i < framesToCopy; ++i)
            {
                inputData[c * pushInputBuffer.stride() + i] = readPtr[c][position + i];
            }
        }

        // Deliver the input frames
        pushInputBuffer.deliver(framesToCopy);

        // Process available input
        while (pushInputBuffer.inputFrameCountRequired() <= 0)
        {
            stretcher1->analyseGrain(pushInputBuffer.outputData(), pushInputBuffer.stride());
            OutputChunk outputChunk;
            stretcher1->synthesiseGrain(outputChunk);
            stretcher1->next(stretcherRequest);

            // Write the output chunk to your buffer
            for (int c = 0; c < processSpec->numChannels; ++c)
            {
                for (int i = 0; i < outputChunk.frameCount && position + i < sampleCount; ++i)
                {
                    writePtr[c][position + i] = outputChunk.data[c * outputChunk.channelStride + i];
                }
            }

            position += outputChunk.frameCount;

            inputChunk = stretcher1->specifyGrain(stretcherRequest);
            pushInputBuffer.grain(inputChunk);
        }
    }

Appreciate any help. Thanks

2

We tried to get it working, and gave up. Switched to SignalSmith Stretch and it works great for our use case.

Bungee looks very promising especially for realtime adjustments but it’s a very low-level API. SignalSmith’s in comparison is just a few lines of code and it “just works”.

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3

@adamwilson Does SignalSmith have better performance than Bungee? I tested on Web and observe that Bungee has a relatively good performance

4

I don’t know, we didn’t get that far. SignalSmith serves our needs well enough. Bungee seems very well thought out, especially for realtime adjustments, but it suffers from a difficult to use API without clear documentation. At least this was the case a few months ago.

1 Like
5

It seems that Chowdhury DSP is working on this:

2 Likes
6

very cool, has anyone experimented with chowdhury implementation of bungee? anyway, i might give it a try in the next few days and report back

7

Bungee creator here. Integrating Bungee into Juce projects should be much easier now since we created a wrapper for the close-to-the-metal Bungee.h API.

There is sample usage of this API here: bungee/cmd/main.cpp at e5a1b1f87e9a3e9bf5dad4673bd4366c9f095c31 · bungee-audio-stretch/bungee · GitHub

Shout if I can help with anything!

3 Likes
8

Hi Adam, I’m trying to use SignalSmithAudio, can you give me some help about it? I can compile but it doesn’t stretch :slight_smile:

9

Would you mind sharing how you made it work, been trying for weeks to have time stretching but just cant work

10

If it worked , please share, been struggling with it for weeks

11

Did you ever make it work, how did you?

12

Are you referring to SignalSmith Stretch, or Bungee?

13

I meant signal smith, but got it figured out

It actually works just fine

1 Like