Allow kFastTrackMultiplier to be specified per device
Change-Id: I4eaaaf038df720cec4f5d9221d1b632970f9e3dd
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 @@
// 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 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 @@
) {
// 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);