source.h File Reference

Media source to read blocks of consecutive audio samples from file. More...

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Typedefs
typedef struct _aubio_source_t	aubio_source_t
	media source object

Functions
aubio_source_t *	new_aubio_source (const char_t *uri, uint_t samplerate, uint_t hop_size)
	create new aubio_source_t
void	aubio_source_do (aubio_source_t *s, fvec_t *read_to, uint_t *read)
	read monophonic vector of length hop_size from source object
void	aubio_source_do_multi (aubio_source_t *s, fmat_t *read_to, uint_t *read)
	read polyphonic vector of length hop_size from source object
uint_t	aubio_source_get_samplerate (aubio_source_t *s)
	get samplerate of source object
uint_t	aubio_source_get_channels (aubio_source_t *s)
	get channels of source object
uint_t	aubio_source_seek (aubio_source_t *s, uint_t pos)
	seek source object
uint_t	aubio_source_get_duration (aubio_source_t *s)
	get the duration of source object, in frames
uint_t	aubio_source_close (aubio_source_t *s)
	close source object
void	del_aubio_source (aubio_source_t *s)
	close source and cleanup memory

Detailed Description

Media source to read blocks of consecutive audio samples from file.

To write to file, use aubio_sink_t.

Depending on how aubio was compiled, the following sources will be available.

When creating a new source using new_aubio_source, the new function of each of the compiled-in sources will be used, in the following order, until one of them gets successfully created. If all sources returned NULL, new_aubio_source will return NULL.

source_avcodec : libav

aubio can be optionally compiled with libav, which can read from a very large number of audio and video formats, including over different network protocols such as HTTP.

source_apple_audio : ExtAudioFileRef

On Mac and iOS platforms, aubio should be compiled with CoreAudio [Extended Audio File Services] (https://developer.apple.com/library/mac/documentation/MusicAudio/Reference/ExtendedAudioFileServicesReference/Reference/reference.html). This provides access to most common audio file formats, including compressed ones.

source_sndfile : libsndfile

Also optional, aubio can be built against libsndfile, which can read most uncompressed formats.

source_wavread : native WAV reader

A simple source to read from 16-bits PCM RIFF encoded WAV files.

Definition in file source.h.

Typedef Documentation

aubio_source_t

typedef struct _aubio_source_t aubio_source_t

media source object

Definition at line 70 of file source.h.

Function Documentation

aubio_source_close()

uint_t aubio_source_close

(

aubio_source_t *

s

)

close source object

Parameters

s	source object, created with new_aubio_source

Returns

0 if sucessful, non-zero on failure

Examples

io/test-source.c.

aubio_source_do()

void aubio_source_do	(	aubio_source_t *	s,
		fvec_t *	read_to,
		uint_t *	read
	)

read monophonic vector of length hop_size from source object

Parameters

s	source object, created with new_aubio_source
read_to	fvec_t of data to read to
read	upon returns, equals to number of frames actually read

Upon returns, read contains the number of frames actually read from the source. hop_size if enough frames could be read, less otherwise.

Examples

io/test-sink.c, io/test-source.c, onset/test-onset.c, spectral/test-mfcc.c, synth/test-sampler.c, and tempo/test-tempo.c.

aubio_source_do_multi()

void aubio_source_do_multi	(	aubio_source_t *	s,
		fmat_t *	read_to,
		uint_t *	read
	)

read polyphonic vector of length hop_size from source object

Parameters

	s	source object, created with new_aubio_source
	read_to	fmat_t of data to read to
[out]	read	upon returns, equals to number of frames actually read

Upon returns, read contains the number of frames actually read from the source. hop_size if enough frames could be read, less otherwise.

Examples

io/test-source.c.

aubio_source_get_channels()

uint_t aubio_source_get_channels

(

aubio_source_t *

s

)

get channels of source object

Parameters

s	source object, created with new_aubio_source

Returns

channels

Examples

io/test-source.c.

aubio_source_get_duration()

uint_t aubio_source_get_duration

(

aubio_source_t *

s

)

get the duration of source object, in frames

Parameters

s	source object, created with new_aubio_source

Returns

number of frames in file

Examples

io/test-source.c.

aubio_source_get_samplerate()

uint_t aubio_source_get_samplerate

(

aubio_source_t *

s

)

get samplerate of source object

Parameters

s	source object, created with new_aubio_source

Returns

samplerate, in Hz

Examples

io/test-sink.c, io/test-source.c, onset/test-onset.c, spectral/test-mfcc.c, synth/test-sampler.c, and tempo/test-tempo.c.

aubio_source_seek()

uint_t aubio_source_seek	(	aubio_source_t *	s,
		uint_t	pos
	)

seek source object

Parameters

s	source object, created with new_aubio_source
pos	position to seek to, in frames

Returns

0 if sucessful, non-zero on failure

Examples

io/test-source.c.

del_aubio_source()

void del_aubio_source

(

aubio_source_t *

s

)

close source and cleanup memory

Parameters

s	source object, created with new_aubio_source

Examples

io/test-sink.c, io/test-source.c, onset/test-onset.c, spectral/test-mfcc.c, synth/test-sampler.c, and tempo/test-tempo.c.

new_aubio_source()

aubio_source_t * new_aubio_source	(	const char_t *	uri,
		uint_t	samplerate,
		uint_t	hop_size
	)

create new aubio_source_t

Parameters

uri	the file path or uri to read from
samplerate	sampling rate to view the fie at
hop_size	the size of the blocks to read from

Creates a new source object. If 0 is passed as samplerate, the sample rate of the original file is used.

The samplerate of newly created source can be obtained using aubio_source_get_samplerate.

Examples

io/test-sink.c, io/test-source.c, onset/test-onset.c, spectral/test-mfcc.c, synth/test-sampler.c, and tempo/test-tempo.c.