libsent/src/adin/adin_mic_freebsd.c File Reference

Microphone input on FreeBSD. More...

#include <sent/stddefs.h>
#include <sent/adin.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <poll.h>
#include <sys/soundcard.h>

Go to the source code of this file.

Defines
#define	DEFAULT_DEVICE   "/dev/dsp"
	Default device name, can be overridden by AUDIODEV environment variable.
#define	FREQALLOWRANGE   200
	Acceptable width of sampling frequency.
#define	POLLINTERVAL   200
	Polling interval in miliseconds.
Functions
boolean	adin_mic_standby (int sfreq, void *arg)
	Device initialization: check device capability and open for recording.
boolean	adin_mic_begin ()
	Start recording.
boolean	adin_mic_end ()
	Stop recording.
int	adin_mic_read (SP16 *buf, int sampnum)
	Read samples from device.
Variables
static int	audio_fd
	Audio descriptor.
static boolean	need_swap
	Whether input samples need byte-swapping.
pollfd	fds [1]
	Workarea for polling device.

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Detailed Description

Microphone input on FreeBSD.

Low level I/O functions for microphone input on FreeBSD.

To use microphone input in FreeBSD, sound card and sound driver must support 16bit monaural recording.

Julius does not alter any mixer device setting at all. You should configure the mixer for recording source (mic/line) and recording volume correctly using other audio tool.

The default device name is "/dev/dsp", which can be changed by setting environment variable AUDIODEV.

Tested on FreeBSD 3.2-RELEASE with snd driver.

Author:

Akinobu LEE

Date:

Sun Feb 13 16:18:26 2005

Revision

1.4

Definition in file adin_mic_freebsd.c.

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Function Documentation

boolean adin_mic_standby	(	int	sfreq,
		void *	arg
	)

Device initialization: check device capability and open for recording.

Parameters:

	sfreq	[in] required sampling frequency.
	arg	[in] a dummy data

Returns:

TRUE on success, FALSE on failure.

Definition at line 90 of file adin_mic_freebsd.c.

boolean adin_mic_begin

(

)

Start recording.

Returns:

TRUE on success, FALSE on failure.

Definition at line 199 of file adin_mic_freebsd.c.

boolean adin_mic_end

(

)

Stop recording.

Returns:

TRUE on success, FALSE on failure.

Definition at line 210 of file adin_mic_freebsd.c.

int adin_mic_read	(	SP16 *	buf,
		int	sampnum
	)

Read samples from device.

Try to read sampnum samples and returns actual number of recorded samples currently available. This function will block until at least one sample can be obtained.

Parameters:

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

Returns:

actural number of read samples, -2 if error.

Definition at line 234 of file adin_mic_freebsd.c.

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