libSpotify (connect) Audio is missing samples

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I am trying to knock together a quick demo to show that I can get audio from libspotify on my embedded device. I am playing back a sine wave and taking the captured PCM data in Audacity to confirm that data is not nonesense.

I have had some success but I am finding the sine wave, when played back, has clicks in it. Looking at the waveform I can see that a wavelength is 100 samples long, but when the clicks occur the wavelength is 89 samples long.

Below is code from the PlaybackAudioData callback, hopefully someone could help point out why I have missing data.

size_t PlaybackAudioData(const int16_t *samples, size_t sample_count,
                        const struct SpSampleFormat *sample_format,
                        uint32_t *samples_buffered, void *context) {

size_t samples_written;

//check the sample format has not changed   
printf("Channels: %d, Sample Rate: %d\n", sample_format->channels, sample_format->sample_rate);

samples_written = 0;

//write samples to file
if(sample_count > 0) {      
    samples_written = fwrite(samples, sizeof(char), sample_count, f);
    printf("Write %d samples: samples written %d\n", (int)sample_count, (int)samples_written);
}

return samples_written;

}

Thanks

asked 1 min ago

aManFromOuterSpace

38

libSpotify (connect) Audio is missing samples