Make the low-latency/powersave policy choice dynamic, based on latency.

This adds a new file that shares the value between the two non-obsolete
android backend.

src/cubeb_aaudio.cpp

@@ -20,6 +20,7 @@
 #include "cubeb-internal.h"
 #include "cubeb_resampler.h"
 #include "cubeb_log.h"
+#include "cubeb_android.h"
 
 #ifdef DISABLE_LIBAAUDIO_DLOPEN
 #define WRAP(x) x
@@ -821,13 +822,13 @@ aaudio_stream_init_impl(
   WRAP(AAudioStreamBuilder_setSharingMode)(sb, AAUDIO_SHARING_MODE_EXCLUSIVE);
 #endif
 
-#ifdef CUBEB_AAUDIO_LOW_LATENCY
-  LOG("AAudio setting low latency mode for stream");
-  WRAP(AAudioStreamBuilder_setPerformanceMode)(sb, AAUDIO_PERFORMANCE_MODE_LOW_LATENCY);
-#elif defined(CUBEB_AAUDIO_POWER_SAVING)
-  LOG("AAudio setting power saving mode for stream");
-  WRAP(AAudioStreamBuilder_setPerformanceMode)(sb, AAUDIO_PERFORMANCE_MODE_POWER_SAVING);
-#endif
+  if (latency_frames <= POWERSAVE_LATENCY_FRAMES_THRESHOLD) {
+    LOG("AAudio setting low latency mode for stream");
+    WRAP(AAudioStreamBuilder_setPerformanceMode)(sb, AAUDIO_PERFORMANCE_MODE_LOW_LATENCY);
+  } else {
+    LOG("AAudio setting power saving mode for stream");
+    WRAP(AAudioStreamBuilder_setPerformanceMode)(sb, AAUDIO_PERFORMANCE_MODE_POWER_SAVING);
+  }
 
   unsigned frame_size;
 

src/cubeb_android.h

@@ -0,0 +1,17 @@
+#ifndef CUBEB_ANDROID_H
+#define CUBEB_ANDROID_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+// If the latency requested is above this threshold, this stream is considered
+// intended for playback (vs. real-time). Tell Android it should favor saving
+// power over performance or latency.
+// This is around 100ms at 44100 or 48000
+const uint16_t POWERSAVE_LATENCY_FRAMES_THRESHOLD = 4000;
+
+#ifdef __cplusplus
+};
+#endif
+
+#endif // CUBEB_ANDROID_H

src/cubeb_opensl.c

@@ -27,6 +27,7 @@
 #include "cubeb-sles.h"
 #include "cubeb_array_queue.h"
 #include "android/cubeb-output-latency.h"
+#include "cubeb_android.h"
 
 #if defined(__ANDROID__)
 #ifdef LOG
@@ -65,11 +66,6 @@
 
 #define DEFAULT_SAMPLE_RATE 48000
 #define DEFAULT_NUM_OF_FRAMES 480
-// If the latency requested is above this threshold, this stream is considered
-// intended for playback (vs. real-time). Tell Android it should favor saving
-// power over performance or latency.
-// This is around 100ms at 44100 or 48000
-#define POWERSAVE_LATENCY_FRAMES_THRESHOLD 4000
 
 static struct cubeb_ops const opensl_ops;