am eb15716b: Change definition of warmup period

#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