From 45a1950e3a706a2f42703bf70556c07b8b19ccb3 Mon Sep 17 00:00:00 2001 From: J C Dutton Date: Sat, 28 Jan 2006 15:08:27 +0000 Subject: [PATCH] Summary: Provides more accurate playback timing. 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 --- start_alsa.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/start_alsa.c b/start_alsa.c index 4174a26a9..97529a5f5 100644 --- a/start_alsa.c +++ b/start_alsa.c @@ -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);