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Summary: Provides more accurate playback timing.

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timestamp should be accurate to +-1ms now.



git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/trunk@121 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
J C Dutton 2006-01-28 15:08:27 +00:00
parent a288430e28
commit 54c7e67580
1 changed files with 4 additions and 0 deletions
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4
start_alsa.c
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@ -329,14 +329,18 @@ int playback_callback(alsa_driver_t *alsa_driver_playback) {
int nsec;
int i,n;
static int ic;
snd_pcm_sframes_t delay;
static short int n2;
int16_t b0[2048];
// printf("playback callback\n");
snd_pcm_delay(this->audio_fd, &delay);
gettimeofday(&tv, NULL);
stime = (double) tv.tv_sec + ((double)tv.tv_usec / 1000000.0) +
*(this->ndsec) * 0.1;
stime = stime + ((double)delay / (double)(this->output_sample_rate));
*(this->Tsec) = stime;
//printf("PLAY:TIME, %lf, %ld, %ld, %d\n", stime, delay, this->output_sample_rate, *this->ndsec);
if(!(this->tx_starting) && (*(this->tx_ok)) ) {
nsec = (int)stime;
n = nsec / *(this->tr_period);