Offroadgeek at 02:41, 28 November 2004

Offroadgeek — Sun, 28 Nov 2004 02:41:40 GMT

←Older revision		Revision as of 02:41, 28 November 2004
Line 47:		Line 47:
	(*) NOTE: There is a bug on the Zaurus with QSound not being able to play sounds shorter than about 8k.		(*) NOTE: There is a bug on the Zaurus with QSound not being able to play sounds shorter than about 8k.
	----		----
-	!Using oss with the Zaurus:	+	Using oss with the Zaurus:
-	!Playing sounds:	+	Playing sounds:

	#include <sys/ioctl.h>		#include <sys/ioctl.h>
Line 81:		Line 81:
	;: }		;: }

-	;: QFile track( "/opt/!QtPalmtop/sounds/somesound.wav" );	+	;: QFile track( "/opt/QtPalmtop/sounds/somesound.wav" );

-	;: if( !track.open( ~~IO_!ReadOnly~~ )) {	+	;: if( track.open( IO_ReadOnly )) {
	;: QMessageBox:message("Sounds","There was an error opening the wav file");		;: QMessageBox:message("Sounds","There was an error opening the wav file");
	;: return -1;		;: return -1;
Line 90:		Line 90:
	;: int oldStyleFileHandle = track.handle();		;: int oldStyleFileHandle = track.handle();
	;: int length;		;: int length;
-	;: while( !track.atEnd()) {	+	;: while( track.atEnd()) {
	;: length = ::read( oldStyleFileHandle, soundBuffer, 1024 ); //read from the file		;: length = ::read( oldStyleFileHandle, soundBuffer, 1024 ); //read from the file
	;: ::write( dsp, soundBuffer, length); //write to the device		;: ::write( dsp, soundBuffer, length); //write to the device
Line 98:		Line 98:
	;: track.close();		;: track.close();
	----		----
-	!To record:	+	To record:

	#include <sys/ioctl.h>		#include <sys/ioctl.h>
Line 137:		Line 137:
	;: }		;: }

-	;: QFile track( "/opt/!QtPalmtop/sounds/myNewSound.wav" );	+	;: QFile track( "/opt/QtPalmtop/sounds/myNewSound.wav" );

-	;: if( !track.open( ~~IO_!WriteOnly~~ \| IO_Truncate )) {	+	;: if( track.open( IO_WriteOnly \| IO_Truncate )) {
	;: QMessageBox:message("Sounds","There was an error opening the wav file");		;: QMessageBox:message("Sounds","There was an error opening the wav file");
	;: return -1;		;: return -1;

Offroadgeek at 02:40, 28 November 2004

Offroadgeek — Sun, 28 Nov 2004 02:40:07 GMT

New page

Zaurus audio development howto:
by L.J. Potter

To get brief audio device info: run this command from the console:
# cat /dev/sndstat

The VERY easiest way to play sound is to use use cat command such as this:
# cat myNewSound >/dev/dsp
;:or in a program, use system()
;:system( "cat myNewSound >/dev/dsp");

The VERY easiest way to record sound is to use use cat command such as this:
# cat /dev/dsp1 >myNewSound
;:or in a program, use system()
;:system( "cat /dev/dsp1 >myNewSound");

This is not the most elegant way to do this.

----
The next easiest way to play audio is to use QSound:
The benefits are that you should be able to play more than one sound at a time.
(*) NOTE: there is no QSound::record()

#include <qsound.h>
#include <qpe/resource.h>

;:QSound::play( Resource::findSound("ohdear") );

(*) NOTE: There is a bug on the Zaurus with QSound not being able to play sounds
shorter than about 8k.
----
or if you can use Qtopia's Sound class to loop sounds:
(there's no docs, so grab the qtopia cvs at sourceforge
and look in the source)

#include <qpe/sound.h>
#include <qpe/resource.h>

;:Sound::soundAlarm();

or something like:

;:Sound mySound( Resource::findSound("ohdear") );
;:mySound.playLoop();
;:mySound.stop();

(*) NOTE: There is a bug on the Zaurus with QSound not being able to play sounds shorter than about 8k.
----
!Using oss with the Zaurus:
!Playing sounds:

#include <sys/ioctl.h>
#include <linux/soundcard.h>

;: int speed = 44100;
;: int channels = 2;
;: int format = AFMT_S16_LE; // or AFMT_U8, but has buggy output on the Z
;: int dsp=0;
;: signed short soundBuffer[1024];

;: dsp = ::open("/dev/dsp", O_WRONLY);
;: if( dsp == -1) {
;: perror("open(\"/dev/dsp\")");
;: return;
;: }

// this is assuming you know what the format of the wav file is.
// otherwise you'd have to read the header file first.

;: if( ioctl( dsp, SNDCTL_DSP_SETFMT , &format)==-1) {
;: perror("ioctl(\"SNDCTL_DSP_SETFMT\")");
;: return -1;
;: }
;: if( ioctl( dsp, SNDCTL_DSP_CHANNELS , &channels)==-1) {
;: perror("ioctl(\"SNDCTL_DSP_CHANNELS\")");
;: return -1;
;: }
;: if( ioctl( dsp, SNDCTL_DSP_SPEED , &speed)==-1) {
;: perror("ioctl(\"SNDCTL_DSP_SPEED\")");
;: return -1;
;: }

;: QFile track( "/opt/!QtPalmtop/sounds/somesound.wav" );

;: if( !track.open( IO_!ReadOnly )) {
;: QMessageBox:message("Sounds","There was an error opening the wav file");
;: return -1;
;: }

;: int oldStyleFileHandle = track.handle();
;: int length;
;: while( !track.atEnd()) {
;: length = ::read( oldStyleFileHandle, soundBuffer, 1024 ); //read from the file
;: ::write( dsp, soundBuffer, length); //write to the device
;: }

;: ::close (dsp);
;: track.close();
----
!To record:

#include <sys/ioctl.h>
#include <linux/soundcard.h>
;: int speed = 22050;
;: int channels = 1;
;:// *NOTE* the Zaurus input is ONLY mono !!

;: int format = AFMT_S16_LE;
;: int dsp=0;
;: signed short soundBuffer[1024];

;: dsp = ::open("/dev/dsp1", O_RDONLY);

;:// *NOTE* the Zaurus has a nonstandard input
;:// so /dev/dsp1 must be opened when
;:// recording

;: if( dsp == -1) {
;: perror("open(\"/dev/dsp\")");
;: return;
;: }

;: // this is assuming you know what the format of the wav file is.
;: // otherwise you'd have to read the header file first.

;: if( ioctl( dsp, SNDCTL_DSP_SETFMT , &format)==-1) {
;: perror("ioctl(\"SNDCTL_DSP_SETFMT\")");
;: return -1;
;: }
;: if( ioctl( dsp, SNDCTL_DSP_CHANNELS , &channels)==-1) {
;: perror("ioctl(\"SNDCTL_DSP_CHANNELS\")");
;: return -1;
;: }
;: if( ioctl( dsp, SNDCTL_DSP_SPEED , &speed)==-1) {
;: perror("ioctl(\"SNDCTL_DSP_SPEED\")");
;: return -1;
;: }

;: QFile track( "/opt/!QtPalmtop/sounds/myNewSound.wav" );

;: if( !track.open( IO_!WriteOnly | IO_Truncate )) {
;: QMessageBox:message("Sounds","There was an error opening the wav file");
;: return -1;
;: }

;: int oldStyleFileHandle = track.handle();

;: int length;
;: while( 1) { // or some other way to stop this crazy thing

;: length = ::read( dsp, soundBuffer, 1024 ); //read from the file
;: ::write( oldStyleFileHandle, soundBuffer, length); //write to the device
;: }

;: ::close (dsp);
;: track.close();

;:// to make a standard wav file, you would need to write
;:// a header before you start writing from the device, and then
;:// write to the header after you finish

For more information about programming OSS, visit:
http://www.opensound.com

This page was last updated: May 21 2003 06:25:12.

Audio Howto - Revision history

Offroadgeek at 02:41, 28 November 2004

Offroadgeek at 02:40, 28 November 2004