alsa debug function

alsa의 latency.c를 실행하다 보니
깔끔하게 상태를 출력해주는 녀석이 있어서 찾아보게 됨.

Hardware PCM card 0 'mxs-evk' device 0 subdevice 0 Its setup is:   stream       : PLAYBACK   access       : RW_INTERLEAVED   format       : S16_LE   subformat    : STD   channels     : 2   rate         : 16000   exact rate   : 16000 (16000/1)   msbits       : 16   buffer_size  : 128   period_size  : 64   period_time  : 4000   tstamp_mode  : NONE   period_step  : 1   avail_min    : 64   period_event : 0   start_threshold  : 2147483647   stop_threshold   : 128   silence_threshold: 0   silence_size : 0   boundary     : 1073741824

snd_pcm_dump(phandle, output); snd_pcm_dump(chandle, output); fflush(stdout);

[링크 : http://www.alsa-project.org/alsa-doc/alsa-lib/group___p_c_m___dump.html#...1d8d]

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state       : RUNNING   trigger_time: 2130.83093753   tstamp      : 2160.96375002   delay       : 48   avail       : 16   avail_max   : 44

snd_output_t *output = NULL; err = snd_output_stdio_attach(&output, stdout, 0); if (err < 0) {         printf("Output failed: %s\n", snd_strerror(err));         return 0; }   void showstat(snd_pcm_t *handle, size_t frames) {         int err;         snd_pcm_status_t *status;         snd_pcm_status_alloca(&status);         if ((err = snd_pcm_status(handle, status)) < 0) {                 printf("Stream status error: %s\n", snd_strerror(err));                 exit(0);         }         printf("*** frames = %li ***\n", (long)frames);         snd_pcm_status_dump(status, output); } [링크 : http://www.alsa-project.org/alsa-doc/alsa-lib/_2test_2latency_8c-example.html]

[링크 : http://www.alsa-project.org/alsa-doc/alsa-lib/group___p_c_m___dump.html#...a51]
[링크 : http://www.alsa-project.org/alsa-doc/alsa-lib/group___p_c_m___dump.html]