libsent/src/adin/adin_portaudio.c File Reference

Microphone input using portaudio library. More...

#include <sent/stddefs.h>
#include <sent/speech.h>
#include <sent/adin.h>
#include "pa/portaudio.h"

Include dependency graph for adin_portaudio.c:

Go to the source code of this file.

Functions
static int	Callback (void *inbuf, void *outbuf, unsigned long len, PaTimestamp outTime, void *userdata)
boolean	adin_mic_standby (int sfreq, void *dummy)
boolean	adin_mic_start ()
boolean	adin_mic_stop ()
int	adin_mic_read (SP16 *buf, int sampnum)
	Read samples from the daemon.
Variables
static SP16 *	speech
	cycle buffer for incoming speech data
static int	current
	writing point
static int	processed
	reading point
static boolean	buffer_overflowed = FALSE
	TRUE if buffer overflowed.
static int	cycle_buffer_len
	length of cycle buffer based on INPUT_DELAY_SEC
static PortAudioStream *	stream
	Stream information.

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Detailed Description

Microphone input using portaudio library.

Author:

Akinobu LEE

Date:

Mon Feb 14 12:03:48 2005

Low level I/O functions for microphone input using portaudio library. To use, please specify "--with-mictype=portaudio" options to configure script. This function is currently available for Linux and Win32. On Windows, this is default.

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 such as xmixer on Linux, or 'Volume Control' on Windows.

Portaudio is a free, cross platform, open-source audio I/O library. The sources are included at libsent/src/adin/pa/. This program uses ring buffer to store captured samples in callback functions with threading.

See also:

http://www.portaudio.com/

Revision

1.5

Definition in file adin_portaudio.c.

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Function Documentation

static int Callback	(	void *	inbuf,
		void *	outbuf,
		unsigned long	len,
		PaTimestamp	outTime,
		void *	userdata
	)			[static]

PortAudio callback to store the incoming speech data into the cycle buffer.

Parameters:

	inbuf	[in] portaudio input buffer
	outbuf	[in] portaudio output buffer (not used)
	len	[in] length of above
	outTime	[in] output time (not used)
	userdata	[in] user defined data (not used)

Returns:

0 when no error, or 1 to terminate recording.

Definition at line 85 of file adin_portaudio.c.

Referenced by adin_mic_standby().

boolean adin_mic_standby	(	int	sfreq,
		void *	dummy
	)

Device initialization: check device capability and open for recording.

Parameters:

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

Returns:

TRUE on success, FALSE on failure.

Definition at line 151 of file adin_portaudio.c.

Referenced by adin_select().

boolean adin_mic_start

(

)

Start recording.

Returns:

TRUE on success, FALSE on failure.

Definition at line 192 of file adin_portaudio.c.

Referenced by adin_mic_standby(), and adin_select().

boolean adin_mic_stop

(

)

Stop recording.

Returns:

TRUE on success, FALSE on failure.

Definition at line 212 of file adin_portaudio.c.

Referenced by adin_mic_standby(), and adin_select().

int adin_mic_read	(	SP16 *	buf,
		int	sampnum
	)

Read samples from the daemon.

Try to read sampnum samples and returns actual number of recorded samples currently available. This function will block until at least some samples are 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 an error occured.

Definition at line 239 of file adin_portaudio.c.

Referenced by adin_select().

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