ref: c9ca26089538e7f8f94b2112b41bc51d4698da98
dir: /src/io/source.h/
/*
Copyright (C) 2012-2013 Paul Brossier <piem@aubio.org>
This file is part of aubio.
aubio is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
aubio is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with aubio. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef AUBIO_SOURCE_H
#define AUBIO_SOURCE_H
/** \file
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.
\b \p source_avcodec : libav
aubio can be optionally compiled with [libav](http://libav.org), which can
read from a very large number of audio and video formats, including over
different network protocols such as HTTP.
\b \p 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.
\b \p source_sndfile : libsndfile
Also optional, aubio can be built against
[libsndfile](http://www.mega-nerd.com/libsndfile/), which can read [most
uncompressed formats](http://www.mega-nerd.com/libsndfile/#Features).
\b \p source_wavread : native WAV reader
A simple source to read from 16-bits PCM RIFF encoded WAV files.
\example io/test-source.c
\example io/test-source_multi.c
*/
#ifdef __cplusplus
extern "C" {
#endif
/** media source object */
typedef struct _aubio_source_t aubio_source_t;
/**
create new ::aubio_source_t
\param uri the file path or uri to read from
\param samplerate sampling rate to view the fie at
\param 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.
*/
aubio_source_t * new_aubio_source(const char_t * uri, uint_t samplerate, uint_t hop_size);
/**
read monophonic vector of length hop_size from source object
\param s source object, created with ::new_aubio_source
\param read_to ::fvec_t of data to read to
\param 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.
*/
void aubio_source_do(aubio_source_t * s, fvec_t * read_to, uint_t * read);
/**
read polyphonic vector of length hop_size from source object
\param s source object, created with ::new_aubio_source
\param read_to ::fmat_t of data to read to
\param[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.
*/
void aubio_source_do_multi(aubio_source_t * s, fmat_t * read_to, uint_t * read);
/**
get samplerate of source object
\param s source object, created with ::new_aubio_source
\return samplerate, in Hz
*/
uint_t aubio_source_get_samplerate(aubio_source_t * s);
/**
get channels of source object
\param s source object, created with ::new_aubio_source
\return channels
*/
uint_t aubio_source_get_channels (aubio_source_t * s);
/**
seek source object
\param s source object, created with ::new_aubio_source
\param pos position to seek to, in frames
\return 0 if sucessful, non-zero on failure
*/
uint_t aubio_source_seek (aubio_source_t * s, uint_t pos);
/**
get the duration of source object, in frames
\param s source object, created with ::new_aubio_source
\return number of frames in file
*/
uint_t aubio_source_get_duration (aubio_source_t * s);
/**
close source object
\param s source object, created with ::new_aubio_source
\return 0 if sucessful, non-zero on failure
*/
uint_t aubio_source_close (aubio_source_t *s);
/**
close source and cleanup memory
\param s source object, created with ::new_aubio_source
*/
void del_aubio_source(aubio_source_t * s);
#ifdef __cplusplus
}
#endif
#endif /* AUBIO_SOURCE_H */