Ok, It's resolved. It works well when:
size =1;
signed int value;
while (PERIOD_SIZE-- >0) {
value =(signed char *)samples;
f_write = write(f_open, value, size);
}
And now I can print data form sound card.
But I don't know why, and how it works... I can only guess.
Best wishes
Marek Michalak
2009/8/31 Marek Michalak <michalak.ma...@gmail.com>
> Hello!
>
> I write a program that capture the sound and when the buffor of sound card
> is full send this by UDP to server. Then server will be calculate the FFT on
> this. So I need the samples. So my record_buffor function in capture
> program:
>
> static void record_buffor(const snd_pcm_channel_area_t *areas,
> snd_pcm_uframes_t offset,int count, double *_phase)
> [...]
> unsigned char *samples[channels];
> [...]
> f_write = write(f_open, *(samples), PERIOD_SIZE); // save
> to the local disk
> LiczbaBajtow=sendto( Deskryptor, *(samples), PERIOD_SIZE, 0,
> (struct sockaddr *)&AdresSerwera, sizeof(AdresSerwera)); //send to server
> while (PERIOD_SIZE-- >0) {
> samples[chn] += steps[chn];
> }
>
> I also try to save the file to local disk in this way:
> unsigned char *tmp;
> size = 2;
> while (PERIOD_SIZE-- >0) {
> tmp[byte] = *(samples[chn] + byte);
> f_write = write(f_open, tmp, size);
> }
> But I have value something like this
> ............^.^.^............^.^.^.^.^.......
>
> If I use fprintf (f_open, "%u",tmp[byte])
> I have only "0.0.0.0.0.0."
>
> So I need the key how open convert this *(samples) to anything that I can
> work with it. Could You help me?
>
> Best wishes
> Mark
>
>
>
>
>
> Pozdrawiam
> Marek Michalak
>
>
> 2009/8/31 Bill Unruh <un...@physics.ubc.ca>
>
> On Mon, 31 Aug 2009, Marek Michalak wrote:
>>
>> Hello!
>>>
>>> I change the pcm.c program from alsa-lib/test, and capture the sound by
>>> asynchronic function with mmap. But when I edit recorded file I've got
>>> only
>>> dots like: ..................
>>>
>> Sound files are not text files. What are you using to try to edit the
>> file?
>>
>> When I open the file in aplay I have capture sound. How converts this
>>> 'dots'
>>> to normal value that I can use in my program?
>>>
>>
>> What program?
>>
>>
>>>
>>> Best wishes
>>> Marek Michalak
>>>
>>>
>>
>
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