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Topic: .wav import for DSP plugin (Read 4418 times) previous topic - next topic
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.wav import for DSP plugin

How do I import a stereo wav file in a DSP plugin? Seems like it should be easy considering fb2k is an audio app.

Right now I'm using a 3rd-party dll to do it, but it seems a little ridiculous. Plus I hate needing to have two dll's for my plugin. All I need to do is read the data from two stereo wav files when my DSP plugin initializes so I can perform stereo convolution.

A note on why stereo convolution is useful: the current "convolve" plugin is R->R and L->L capable only. Stereo convolution sends the R signal to the L channel (under one convolution) and to the R channel (under a different convolution), and the same for L->(L and R). This way I can perform head-related transfer functions (HRTFs) to my music to improve headphone listening. HRTFs are approximated by crossfeed and bs2b, but why be approximate when you can be precise?

I have all the basics complete now---wav input, config dialog, efficient stereo convolution using DHT---so it's time to clean up the code, debug, and add safeguards. Wav importing is my first target for improvement.

.wav import for DSP plugin

Reply #1 –
I'm not sure if this is correct, but I figured I'd throw the idea out there since there haven't been any responses yet.  Have you looked at what's available in "input.h", specifically input_decoder and input_entry?  Just from inspection, it looks like those classes (along with audio_chunk) should be exactly what you need to open and decode a WAV file.  Again, I haven't tried it personally.

.wav import for DSP plugin

Reply #2 –
Here's some code (quickly adapted from fingerprint generation in foo_sic, so it might not compile right away):
Code: [Select]
bool void g_decode_file(char const * p_path, abort_callback & p_abort)
{
    try
    {
        input_helper helper;
        file_info_impl info;

        // open input
        helper.open(service_ptr_t<file>(), make_playable_location(p_path, 0), input_flag_simpledecode, p_abort);

        helper.get_info(0, info, p_abort);
        if (info.get_length() <= 0)
            throw pfc::exception("Track length invalid");

        audio_chunk_impl chunk;

        if (!helper.run(chunk, p_abort)) return false;


        t_uint64 length_samples = audio_math::time_to_samples(info.get_length(), chunk.get_sample_rate());
        //chunk.get_channels();

        while (true)
        {
            // Store the data somewhere.

            bool decode_done = !helper.run(chunk, p_abort);
            if (decode_done) break;
        }

        // We now have the full data.

        return true;
    }
    catch (const exception_aborted &) {throw;}
    catch (const std::exception & exc)
    {
        console::formatter() << exc << ": " << p_path;
        return false;
    }
};

.wav import for DSP plugin

Reply #3 –
Quote from: foosion on
Here's some code (quickly adapted from fingerprint generation in foo_sic, so it might not compile right away)


I looked a bit at input.h---I'll take a longer look (and try that other code) later tonight. Other than revamping the .wav input, the plugin is pretty much done.