Compute MFCC from audio file for iOS apps

[Bee-HN]

Hello, I am new to iOS development and Aubio. Can someone show me how to compute the mfcc from audio input file? So far, I manage to load audio file following the example from aubio's documentation;
below is my code in Objective-C:

unsigned int hop_size = 512;
fvec_t *f_vector = new_fvec(hop_size);
aubio_source_t *new_source = new_aubio_source(audio_file_path, 0, hop_size);
// smpl_t samplerate = aubio_source_get_samplerate(new_source);
unsigned int read = 0;
unsigned int total_frames = 0;
int count = 0;
while (true)
{
aubio_source_do(new_source, f_vector, &read);
total_frames += read;
count += 1;
if (read < hop_size)
{
break;
}
}
NSLog (@"Read: %u frames at: %u Hz", total_frames, aubio_source_get_samplerate(new_source));
NSLog (@"Data Vector:");
fvec_print(f_vector);

Thank you

[piem]

hi @Bee-HN

The file tests/src/spectral/test-mfcc.c was just updated to a more complete example, see 423a427 (the branch will be merged in master once the tests have passed).

Could you share the line where audio_file_path is declared? @socalledsound mentioned having troubles with this in #179.

thanks, piem

[Bee-HN]

Hi piem,
This is my code to get the file path of the audio file

NSString *file_path_string = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject] stringByAppendingPathComponent:@"name_of_audio_file.m4a"];

const char *audio_file_path = [file_path_string UTF8String];