playback open error:

["Ashlesha Shintre" <ashlesha.shintre@xxxxxxxxx>]

Hi,

I m trying to run the simple playback program that I have attached with this
email -- and I get the following error:

ALSA lib pcm_dmix.c:862:(snd_pcm_dmix_open) unable to open slave
> Playback open error: Device or resource busy


I am running this program as a function called wavplay (attached) --
however, if i run the same program, as part of the main function, then there
is no problem --
What i mean is that if i basically just paste the code for the wavplay
function in main and provide the input values (the pcm data to be played) --
then it can very well open the default device and play the pcm data that is
being passed to it!

Any pointers?
Thanks,
Ashlesha.

#include "common.h"

void wavplay(short int in[], int lastind)         //lastind - no. of samples from buffin to be played
{
    static char *device = "default";                        /* playback device */
    snd_output_t *output = NULL;
    int count;
    short int buffin[lastind];
    int err,bytesread=1;
    unsigned int i;
    char d;
    snd_pcm_t *handle;
    snd_pcm_sframes_t frames;
   
    count=0;
    while(count<lastind)                    // copy the input buffer into a local buffer to be played
        buffin[count]=in[count++];
    

//        printf("no. of samples @16000Hz are %d\n",count);
      
              if ((err = snd_pcm_open(&handle, device, SND_PCM_STREAM_PLAYBACK, 0)) < 0) {
                      printf("Playback open error: %s\n", snd_strerror(err));
                      exit(EXIT_FAILURE);
              }
              if ((err = snd_pcm_set_params(handle,
                                            SND_PCM_FORMAT_S16_LE, 
                                            SND_PCM_ACCESS_RW_INTERLEAVED,
                                            1,
                                            16000,
                                            1,
                                            10000)) < 0) {   /* 2 sec */
                      printf("Playback open error: %s\n", snd_strerror(err));
                      exit(EXIT_FAILURE);
              }
      
              for (i = 0; i < 16; i++) {
                      //frames = snd_pcm_writei(handle, buffin, sizeof(buffin));
                      frames = snd_pcm_writei(handle, buffin, 128000);
                      if (frames < 0)
                              frames = snd_pcm_recover(handle, frames, 0);
                      if (frames < 0) {
                              printf("snd_pcm_writei failed: %s\n", snd_strerror(err));
                              break;
                      }
                      if (frames > 0 && frames < (long)sizeof(buffin))
                              printf("Short write (expected %li, wrote %li)\n", (long)sizeof(buffin), frames);
              }
      
              snd_pcm_close(handle);
            
              //return 0;
      }


// problem is the fact that the alsa gives an error on the device open! says device is busy..
// /dev/dsp and fuser -v /dev/dsp gives no output!

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