mirror of
https://gitee.com/openharmony/third_party_alsa-lib
synced 2024-11-27 01:31:08 +00:00
84ebfe7c92
Fix compile errors/warnings. omixer is removed since ordinary_mixer isn't supported any more.
129 lines
3.5 KiB
C
129 lines
3.5 KiB
C
#include <unistd.h>
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#include <sys/time.h>
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#include <alsa/asoundlib.h>
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#include <alsa/seq.h>
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void normalize(struct timeval *tv)
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{
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if (tv->tv_sec == 0) {
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while (tv->tv_usec <= -1000000) { tv->tv_usec += 1000000; --tv->tv_sec; }
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while (tv->tv_usec >= 1000000) { tv->tv_usec -= 1000000; ++tv->tv_sec; }
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} else if (tv->tv_sec < 0) {
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while (tv->tv_usec <= -1000000) { tv->tv_usec += 1000000; --tv->tv_sec; }
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while (tv->tv_usec > 0) { tv->tv_usec -= 1000000; ++tv->tv_sec; }
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} else {
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while (tv->tv_usec >= 1000000) { tv->tv_usec -= 1000000; ++tv->tv_sec; }
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while (tv->tv_usec < 0) { tv->tv_usec += 1000000; --tv->tv_sec; }
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}
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}
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int
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main(int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED)
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{
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snd_seq_t *handle;
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int portid;
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/* int npfd;
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struct pollfd *pfd;
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*/
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int queue;
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/* int i;
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int rval;'
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*/
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struct timeval starttv, prevdiff;
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int countdown = -1;
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/* snd_seq_queue_timer_t *timer;
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snd_timer_id_t *timerid;
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*/
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if (snd_seq_open(&handle, "hw", SND_SEQ_OPEN_DUPLEX, 0) < 0) {
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fprintf(stderr, "failed to open ALSA sequencer interface\n");
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return 1;
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}
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snd_seq_set_client_name(handle, "generator");
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if ((portid = snd_seq_create_simple_port
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(handle, "generator",
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SND_SEQ_PORT_CAP_READ | SND_SEQ_PORT_CAP_SUBS_READ, 0)) < 0) {
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fprintf(stderr, "failed to create ALSA sequencer port\n");
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return 1;
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}
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if ((queue = snd_seq_alloc_queue(handle)) < 0) {
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fprintf(stderr, "failed to create ALSA sequencer queue\n");
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return 1;
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}
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/*
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snd_seq_queue_timer_alloca(&timer);
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snd_seq_get_queue_timer(handle, queue, timer);
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snd_timer_id_alloca(&timerid);
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snd_timer_id_set_class(timerid, SND_TIMER_CLASS_PCM);
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snd_timer_id_set_sclass(timerid, SND_TIMER_SCLASS_NONE);
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snd_timer_id_set_card(timerid, 0);
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snd_timer_id_set_device(timerid, 0);
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snd_timer_id_set_subdevice(timerid, 0);
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snd_seq_queue_timer_set_id(timer, timerid);
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snd_seq_set_queue_timer(handle, queue, timer);
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*/
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snd_seq_start_queue(handle, queue, 0);
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snd_seq_drain_output(handle);
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gettimeofday(&starttv, 0);
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prevdiff.tv_sec = 0;
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prevdiff.tv_usec = 0;
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while (countdown != 0) {
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snd_seq_queue_status_t *status;
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const snd_seq_real_time_t *rtime;
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struct timeval tv, diff, diffdiff;
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struct timespec ts;
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snd_seq_queue_status_alloca(&status);
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snd_seq_get_queue_status(handle, queue, status);
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rtime = snd_seq_queue_status_get_real_time(status);
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gettimeofday(&tv, 0);
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tv.tv_sec -= starttv.tv_sec;
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tv.tv_usec -= starttv.tv_usec;
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normalize(&tv);
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diff.tv_sec = tv.tv_sec - rtime->tv_sec;
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diff.tv_usec = tv.tv_usec - rtime->tv_nsec / 1000;
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normalize(&diff);
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diffdiff.tv_sec = diff.tv_sec - prevdiff.tv_sec;
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diffdiff.tv_usec = diff.tv_usec - prevdiff.tv_usec;
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normalize(&diffdiff);
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prevdiff = diff;
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fprintf(stderr, " real time: %12ld sec %8ld usec\nqueue time: %12ld sec %8ld usec\n diff: %12ld sec %8ld usec\n diffdiff: %12ld sec %8ld usec\n",
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tv.tv_sec, tv.tv_usec,
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(long)rtime->tv_sec, (long)rtime->tv_nsec / 1000,
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diff.tv_sec, diff.tv_usec,
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(long)diffdiff.tv_sec, (long)diffdiff.tv_usec);
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if (diffdiff.tv_usec > 5000 ||
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diffdiff.tv_usec < -5000) {
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fprintf(stderr, "oops! queue slipped\n");
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if (tv.tv_sec < 5) {
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fprintf(stderr, "(ignoring in first few seconds)\n");
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} else {
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countdown = 2;
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}
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} else {
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if (countdown > 0) --countdown;
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}
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fprintf(stderr, "\n");
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// sleep(1);
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ts.tv_sec = 0;
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ts.tv_nsec = 500000000;
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nanosleep(&ts, 0);
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}
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return EXIT_SUCCESS;
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}
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