From 56f4b124bd5110dadd00a8bfe7adab28cb82f425 Mon Sep 17 00:00:00 2001 From: Mike Brady Date: Tue, 8 Jan 2019 13:06:46 +0000 Subject: [PATCH] Adjust thresholds and timings to suit pi zero. --- audio_alsa.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/audio_alsa.c b/audio_alsa.c index b7a5de8d..4ae2d029 100644 --- a/audio_alsa.c +++ b/audio_alsa.c @@ -633,8 +633,8 @@ static int init(int argc, char **argv) { config.audio_backend_buffer_interpolation_threshold_in_seconds = 0.100; // below this, basic interpolation will be used to save time. config.alsa_maximum_stall_time = 0.200; // 200 milliseconds -- if it takes longer, it's a problem - config.audio_backend_silence_threshold = 0.050; //start sending silent frames if the delay goes below this time - config.audio_backend_silence_scan_interval = 0.005; //check silence threshold this often + config.audio_backend_silence_threshold = 0.040; //start sending silent frames if the delay goes below this time + config.audio_backend_silence_scan_interval = 0.003; //check silence threshold this often stall_monitor_error_threshold = (uint64_t)1000000 * config.alsa_maximum_stall_time; // stall time max to microseconds; @@ -1264,7 +1264,7 @@ static void flush(void) { int preflight(__attribute__((unused)) void *buf, __attribute__((unused)) int samples) { uint64_t time_now = get_absolute_time_in_fp(); // this is to regulate access by the silence filler thread - uint64_t standoff_time = 100; // milliseconds + uint64_t standoff_time = 60; // milliseconds standoff_time = (standoff_time << 32)/1000; most_recent_write_time = time_now + standoff_time; return 0; @@ -1472,7 +1472,7 @@ void *alsa_buffer_monitor_thread_code(void *arg) { sleep_time_in_fp = sleep_time_in_fp << 32; sleep_time_in_fp = sleep_time_in_fp / 1000; // debug(1,"alsa: sleep_time: %d ms or 0x%" PRIx64 " in fp form.",sleep_time_ms,sleep_time_in_fp); - int frames_of_silence = (desired_sample_rate * sleep_time_ms * 4) / 1000; + int frames_of_silence = (desired_sample_rate * sleep_time_ms * 2) / 1000; size_t size_of_silence_buffer = frames_of_silence * frame_size; // debug(1,"Silence buffer length: %u bytes.",size_of_silence_buffer); void *silence = malloc(size_of_silence_buffer);