I was validating pause/resume of my alsa driver for spdif. After few loop of pause/resume snd_pcm_writei routine returns error.
(error code -77, No such device or address).
For testing I'm using pcm.c in test/pcm.c. I modified pcm.c under name pcm_pause.c to support pause and resume.
I'm attaching my patch for changes below.
--- pcm.c 2011-08-13 14:35:15.384157182 +0530
+++ pcm_pause.c 2011-11-30 14:20:26.990180303 +0530
@@ -779,7 +779,7 @@
{NULL, 0, NULL, 0},
};
snd_pcm_t *handle;
- int err, morehelp;
+ int err, morehelp,pid;
snd_pcm_hw_params_t *hwparams;
snd_pcm_sw_params_t *swparams;
int method = 0;
@@ -912,14 +912,40 @@
areas[chn].first = chn * snd_pcm_format_physical_width(format);
areas[chn].step = channels * snd_pcm_format_physical_width(format);
}
-
- err = transfer_methods[method].transfer_loop(handle, samples, areas);
- if (err < 0)
- printf("Transfer failed: %s\n", snd_strerror(err));
-
- free(areas);
- free(samples);
- snd_pcm_close(handle);
- return 0;
+
+ pid = fork();
+ if(pid > 0){
+ err = transfer_methods[method].transfer_loop(handle, samples, areas);
+ if (err < 0)
+ printf("Transfer failed: %s\n", snd_strerror(err));
+
+ free(areas);
+ free(samples);
+ snd_pcm_close(handle);
+ return 0;
+ }
+
+ if(pid == 0)
+ {
+ int pause_count = 0;
+ int resume_count = 0;
+ while(1)
+ {
+ sleep(1);
+ if((err = snd_pcm_pause(handle,1)) < 0)
+ {
+ printf("\nPause Failed: %s", snd_strerror(err));
+ exit(EXIT_FAILURE);
+ }
+ printf("\nPAUSED Audio: Count %d\n", ++pause_count);
+ sleep(1);
+ if((err = snd_pcm_pause(handle,0)) < 0)\
+ {
+ printf("\nResume Failed: %s", snd_strerror(err));
+ exit(EXIT_FAILURE);
+ }
+ printf("\nRESUME Audio: Count %d\n", ++resume_count);
+ }
+ }
}
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