diff options
| -rw-r--r-- | services/audioflinger/Threads.cpp | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/services/audioflinger/Threads.cpp b/services/audioflinger/Threads.cpp index 7843387..cd66b16 100644 --- a/services/audioflinger/Threads.cpp +++ b/services/audioflinger/Threads.cpp @@ -142,8 +142,17 @@ static const int kPriorityFastMixer = 3; // FIXME It would be better for client to tell AudioFlinger the value of N, // so AudioFlinger could allocate the right amount of memory. // See the client's minBufCount and mNotificationFramesAct calculations for details. + +// This is the default value, if not specified by property. static const int kFastTrackMultiplier = 2; +// The minimum and maximum allowed values +static const int kFastTrackMultiplierMin = 1; +static const int kFastTrackMultiplierMax = 2; + +// The actual value to use, which can be specified per-device via property af.fast_track_multiplier. +static int sFastTrackMultiplier = kFastTrackMultiplier; + // See Thread::readOnlyHeap(). // Initially this heap is used to allocate client buffers for "fast" AudioRecord. // Eventually it will be the single buffer that FastCapture writes into via HAL read(), @@ -152,6 +161,22 @@ static const size_t kRecordThreadReadOnlyHeapSize = 0x1000; // ---------------------------------------------------------------------------- +static pthread_once_t sFastTrackMultiplierOnce = PTHREAD_ONCE_INIT; + +static void sFastTrackMultiplierInit() +{ + char value[PROPERTY_VALUE_MAX]; + if (property_get("af.fast_track_multiplier", value, NULL) > 0) { + char *endptr; + unsigned long ul = strtoul(value, &endptr, 0); + if (*endptr == '\0' && kFastTrackMultiplierMin <= ul && ul <= kFastTrackMultiplierMax) { + sFastTrackMultiplier = (int) ul; + } + } +} + +// ---------------------------------------------------------------------------- + #ifdef ADD_BATTERY_DATA // To collect the amplifier usage static void addBatteryData(uint32_t params) { @@ -1321,7 +1346,12 @@ sp<AudioFlinger::PlaybackThread::Track> AudioFlinger::PlaybackThread::createTrac ) { // if frameCount not specified, then it defaults to fast mixer (HAL) frame count if (frameCount == 0) { - frameCount = mFrameCount * kFastTrackMultiplier; + // read the fast track multiplier property the first time it is needed + int ok = pthread_once(&sFastTrackMultiplierOnce, sFastTrackMultiplierInit); + if (ok != 0) { + ALOGE("%s pthread_once failed: %d", __func__, ok); + } + frameCount = mFrameCount * sFastTrackMultiplier; } ALOGV("AUDIO_OUTPUT_FLAG_FAST accepted: frameCount=%d mFrameCount=%d", frameCount, mFrameCount); |