#define FAST_HOT_IDLE_NS 1000000L // 1 ms: time to sleep while hot idling
#define FAST_DEFAULT_NS 999999999L // ~1 sec: default time to sleep
+#define MIN_WARMUP_CYCLES 2 // minimum number of loop cycles to wait for warmup
#define MAX_WARMUP_CYCLES 10 // maximum number of loop cycles to wait for warmup
namespace android {
// To avoid an initial underrun on fast tracks after exiting standby,
// do not start pulling data from tracks and mixing until warmup is complete.
// Warmup is considered complete after the earlier of:
- // first successful single write() that blocks for more than warmupNs
+ // MIN_WARMUP_CYCLES write() attempts and last one blocks for at least warmupNs
// MAX_WARMUP_CYCLES write() attempts.
// This is overly conservative, but to get better accuracy requires a new HAL API.
if (!isWarm && attemptedWrite) {
measuredWarmupTs.tv_nsec -= 1000000000;
}
++warmupCycles;
- if ((attemptedWrite && nsec > warmupNs) ||
+ if ((nsec > warmupNs && warmupCycles >= MIN_WARMUP_CYCLES) ||
(warmupCycles >= MAX_WARMUP_CYCLES)) {
isWarm = true;
dumpState->mMeasuredWarmupTs = measuredWarmupTs;
}
}
#ifdef FAST_MIXER_STATISTICS
+ if (isWarm) {
// advance the FIFO queue bounds
size_t i = bounds & (FastMixerDumpState::kSamplingN - 1);
bounds = (bounds & 0xFFFF0000) | ((bounds + 1) & 0xFFFF);
ATRACE_INT("cycle_ms", monotonicNs / 1000000);
ATRACE_INT("load_us", loadNs / 1000);
#endif
+ }
#endif
} else {
// first time through the loop