libsent/src/adin/adin_sndfile.c File Reference

Audio input from file using libsndfile library. More...

#include <sent/stddefs.h>
#include <sent/speech.h>
#include <sent/adin.h>
#include <sndfile.h>

Include dependency graph for adin_sndfile.c:

Go to the source code of this file.

Functions
static boolean	check_format (SF_INFO *s)
	Check if the file format is 16bit, monoral.
static void	print_format (SF_INFO *s)
	Output format information to stdout (compliant to libsnd-0.0.23).
boolean	adin_sndfile_standby (int freq, void *arg)
boolean	adin_sndfile_begin ()
	Begin reading audio data from a file.
int	adin_sndfile_read (SP16 *buf, int sampnum)
boolean	adin_sndfile_end ()
Variables
static int	sfreq
	Required sampling frequency in Hz.
static SF_INFO	sinfo
	Wavefile information.
static SNDFILE *	sp
	File handler.
static boolean	from_file
	TRUE if reading filename from listfile.
static FILE *	fp_list
	File pointer used for the listfile.

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Detailed Description

Audio input from file using libsndfile library.

Author:

Akinobu LEE

Date:

Mon Feb 14 12:13:27 2005

Functions to get input from wave file using libsndfile library. Many file formats are supported, including Microsoft WAVE format, and RAW (no header) format, AU, SND, NIST and so on. The channel number should be 1 (monaural). On RAW file input, the data byte order must be in big endian.

The sampling rate of input file must be equal to the system requirement value which is specified by adin_standby() . For WAVE format file, the sampling rate of the input file described in its header is checked against the system value, and rejected if not matched. But for RAW format file, no check will be applied since it has no header information about the recording sampling rate, so be careful of the sampling rate setting.

When file input mode, the file name will be read from standard input. If a filelist file is specified, the file names are read from the file sequencially instead.

libsndfile should be installed before compilation. The library and header will be automatically detected by configure script. When failed to detect, Julius uses adin_file.c instead for file input.

This file will work on libsndfile version 1.0.x.

See also:

http://www.mega-nerd.com/libsndfile/

Revision

1.3

Definition in file adin_sndfile.c.

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Function Documentation

boolean adin_sndfile_standby	(	int	freq,
		void *	arg
	)

Initialization: if listfile is specified, open it here. Else, just store the required frequency.

Parameters:

	freq	[in] required sampling frequency
	arg	[in] file name of listfile, or NULL if not use

Returns:

TRUE on success, FALSE on failure.

Definition at line 202 of file adin_sndfile.c.

Referenced by adin_select().

boolean adin_sndfile_begin

(

)

Begin reading audio data from a file.

If listfile was specified in adin_sndfile_standby(), the next filename will be read from the listfile. Otherwise, the filename will be obtained from stdin. Then the file will be opened here.

Returns:

TRUE on success, FALSE on failure.

Definition at line 232 of file adin_sndfile.c.

Referenced by adin_select().

int adin_sndfile_read	(	SP16 *	buf,
		int	sampnum
	)

Try to read sampnum samples and returns actual sample num recorded.

Parameters:

	buf	[out] samples obtained in this function
	sampnum	[in] wanted number of samples to be read

Returns:

actural number of read samples, -1 if EOF, -2 if error.

Definition at line 313 of file adin_sndfile.c.

Referenced by adin_select().

boolean adin_sndfile_end

(

)

End recording.

Returns:

TRUE on success, FALSE on failure.

Definition at line 334 of file adin_sndfile.c.

Referenced by adin_select().

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