Access Violation when resampling using soxr

Question

I'm having trouble getting the following code to work:

soxr_error_t err;
soxr_datatype_t itype = SOXR_INT16_I;
soxr_datatype_t otype = SOXR_INT16_I;
soxr_io_spec_t iospec = soxr_io_spec(itype, otype);
size_t idone = 0;
size_t odone = 0;
size_t const olen = (size_t)((speed * 44100) * (numframes * 2) / (44100 + (44100 * speed)) + .5);

// Do the resampling
short* output = new short[numframes * 2];
soxr_t sox = soxr_create(44100, 44100 * speed, 2, &err, &iospec, NULL, NULL);
if (!err)
    soxr_process(sox, input, numframes * 2, &idone, output, olen * 2, &odone);
soxr_delete(sox);

I have PCM short data coming in (the input object) and I want it too be resampled to a value speed that is being multiplied with the original samplerate as you can see (44100 is the standard). Also numframes is the number of frames from the block of data I send (which is in stereo)

The problem is that my application crashes when doing the soxr_process() method. There seems to be no error from the soxr_create() method so I don't really know what it could be.

I'm currently only trying to speed up the sound so I made the output buffer as large as the original which would be good enough to hold everything after the resample.

How can I solve this problem? Did I give the wrong values to the soxr_process() method?

EDIT:
I have also tried with this method:

soxr_oneshot(4410, 44100 * speed, 2, input, numframes * 2, &idone, output, outputFrames * 2, &odone, &iospec, NULL, NULL);

but that also throws a Acces Violation error.

Thanks in advance!

score 0 · Answer 1 · answered Mar 02 '15 at 14:04

I have been able to fix it using this code:

// Check the number of frames needed to fill extra or send to the next block
int outputFrames = numframes * speed;
int extraReadNeeded = numframes - outputFrames;

soxr_error_t err;

soxr_datatype_t itype = SOXR_INT16_I;
soxr_datatype_t otype = SOXR_INT16_I;
soxr_io_spec_t iospec = soxr_io_spec(itype, otype);

size_t idone = 0;
size_t odone = 0;

size_t const olen = (size_t)((speed * 44100) * (numframes * 2) / (44100 + (44100 * speed)) + .5);

// Do the resampling
short* output = new short[outputFrames * 4];
soxr_t sox = soxr_create(44100, 44100 * speed, 2, &err, &iospec, NULL, NULL);
if (!err)
    err = soxr_process(sox, input, numframes * 2, &idone, output, outputFrames, &odone);
soxr_delete(sox);

It seems like the output wasn't large enough like I expected. Don't really know how it is written to the pointer though. It's fixed for now.

If anyone has any remarks feel free to point out the mistakes

Access Violation when resampling using soxr

1 Answers1