Re: how to play 16k audio file

Dear Korovkin,

Please find attached hello_16k_mono.pcm and 
simplay.c for C example.

#compile
gcc simplay.c -o simplay

#test
simplay hello_16k_mono.pcm

This example is not working under opie 0.82.
If I modify line 32, and 33 to be
	nSampleRate = 16000;
	nChannels   = 1;
->
	nSampleRate = 48000;
	nChannels   = 2;

It can play sampling rate 48000 stereo pcm file.
I am wondering if I had to install extra drivers
to make 16000 mono sound file able to play.

Have a nice day
Thanks and Best regards,

Alan

--- Dmitriy Korovkin <[email protected]> 說：

> Alan, will you attach a sound file and describe how
> we can reproduce the 
> problem you see, please.
> 
> Dmitriy
> 
> 
> 
> [email protected] wrote:
> 
> >Hi all,
> >
> >Under opie 0.82,
> >I found I can only configure /dev/audio
> >to be 48000 sampling rate with stereo playback.
> >
> >Do I need more driver or patch to make
> >16000 mono audio to play?
> >
> >Best regards,
> >
> >Alan
> >
> >___________________________________________________
> 
> > 最新版 Yahoo!奇摩即時通訊
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> >_______________________________________________
> >
>
>http://opie.handhelds.org/cgi-bin/moin.cgi/DeveloperWikiIndex
> >
> >Opie-devel mailing list
> >[email protected]
> >https://handhelds.org/mailman/listinfo/opie-devel
> >
> >  
> >
> 
> 


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#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/soundcard.h>
#include <string.h>
#include <wait.h>

#define BUFFER_SIZE 320000 //10 seconds for 16k,16bit

int main(int argc, char **argv)
{
	int nDevice, nFormat, nSampleRate, nChannels, nLen, nClose;
	char szBuffer[BUFFER_SIZE];
	FILE *fp;

	if (argc<2) {
		printf("usage: %s play_file\n", argv[0]);
		return -1;
	}

	//playback
	//open device
	nDevice = open("/dev/dsp", O_WRONLY, 0);
	printf("device open: %d\n",nDevice);
	
	//io setting
	nFormat  = AFMT_S16_LE;
	nSampleRate = 16000;
	nChannels   = 1;
	printf("set record format : %d\n",ioctl(nDevice, SNDCTL_DSP_SETFMT, &nFormat));
	printf("set sample rate : %d\n",ioctl(nDevice, SNDCTL_DSP_SPEED, &nSampleRate));
	printf("set channels : %d\n",ioctl(nDevice, SNDCTL_DSP_STEREO, &nChannels));

	//read data
	fp = fopen(argv[1], "rb");
	printf("playback ...\n");
	while ( ( nLen=fread(szBuffer, sizeof(char), sizeof(szBuffer), fp) )>0 ) {
		printf("play data : %d\n",write(nDevice, szBuffer, nLen));
	}
	fclose(fp);
	
	//close device
	nClose = 0;
	printf("set close : %d\n",ioctl(nDevice, SNDCTL_DSP_SYNC, &nClose));
	printf("device close: %d\n",close(nDevice));
	
	return 0;
}