Add support for androidboot. configuration of the Audio HAL

By default, the car emulator HAL reads vendor properties, which need
to come from either a device makefile or a script. In some virtualized
environments, it is convenient for the host to adjust the kernel command
line as a source of configuration to the Android guest (same image can
work across hardware and hypervisor, for example)

Allowing Audio HAL to read its configuration from ro.boot.vendor
properties means that these flags can now be configured via
androidboot. properties in the kernel configuration

Bug: 262922694
Test: flash and boot, also tested by partner
Change-Id: I2014e9e8e8e81c78ebcb1cf37a2b64ab080881e2

1 files changed, 43 insertions, 8 deletions

diff --git a/emulator/audio/driver/audio_hw.c b/emulator/audio/driver/audio_hw.c
index 06b0fe8..39c763b 100644
--- a/emulator/audio/driver/audio_hw.c
+++ b/emulator/audio/driver/audio_hw.c
@@ -55,10 +55,26 @@
 #define DEFAULT_IN_PERIOD_MS 15
 #define DEFAULT_IN_PERIOD_COUNT 4
 
-static const char* PROP_KEY_OUT_PERIOD_MS = "ro.vendor.caremu.audiohal.out_period_ms";
-static const char* PROP_KEY_OUT_PERIOD_COUNT = "ro.vendor.caremu.audiohal.out_period_count";
-static const char* PROP_KEY_IN_PERIOD_MS = "ro.vendor.caremu.audiohal.in_period_ms";
-static const char* PROP_KEY_IN_PERIOD_COUNT = "ro.vendor.caremu.audiohal.in_period_count";
+#ifndef ARRAY_SIZE
+#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
+#endif
+
+static const char* PROP_KEY_OUT_PERIOD_MS[2] = {
+    "ro.boot.vendor.caremu.audiohal.out_period_ms",
+    "ro.vendor.caremu.audiohal.out_period_ms",
+};
+static const char* PROP_KEY_OUT_PERIOD_COUNT[2] = {
+    "ro.boot.vendor.caremu.audiohal.out_period_count",
+    "ro.vendor.caremu.audiohal.out_period_count",
+};
+static const char* PROP_KEY_IN_PERIOD_MS[2] = {
+    "ro.boot.vendor.caremu.audiohal.out_period_count",
+    "ro.vendor.caremu.audiohal.out_period_count",
+};
+static const char* PROP_KEY_IN_PERIOD_COUNT[2] = {
+    "ro.boot.vendor.caremu.audiohal.in_period_count",
+    "ro.vendor.caremu.audiohal.in_period_count",
+};
 
 #define PI 3.14159265
 #define TWO_PI  (2*PI)
@@ -92,10 +108,23 @@ static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
 
 static int adev_get_mic_mute(const struct audio_hw_device *dev, bool *state);
 
+static int audio_get_property(const char** keys, size_t num_keys, int32_t default_value) {
+    static char prop_value[PROP_VALUE_MAX] = {0};
+    for (size_t i = 0; i < num_keys; ++i) {
+        if (property_get(keys[i], prop_value, NULL) > 0) {
+            return property_get_int32(keys[i], default_value);
+        }
+    }
+
+    return default_value;
+}
+
 static int get_out_period_ms() {
     static int out_period_ms = -1;
     if (out_period_ms == -1) {
-        out_period_ms = property_get_int32(PROP_KEY_OUT_PERIOD_MS, DEFAULT_OUT_PERIOD_MS);
+        out_period_ms = audio_get_property(PROP_KEY_OUT_PERIOD_MS,
+                                           ARRAY_SIZE(PROP_KEY_OUT_PERIOD_MS),
+                                           DEFAULT_OUT_PERIOD_MS);
     }
     return out_period_ms;
 }
@@ -103,7 +132,9 @@ static int get_out_period_ms() {
 static int get_out_period_count() {
     static int out_period_count = -1;
     if (out_period_count == -1) {
-        out_period_count = property_get_int32(PROP_KEY_OUT_PERIOD_COUNT, DEFAULT_OUT_PERIOD_COUNT);
+        out_period_count = audio_get_property(PROP_KEY_OUT_PERIOD_COUNT,
+                                              ARRAY_SIZE(PROP_KEY_OUT_PERIOD_COUNT),
+                                              DEFAULT_OUT_PERIOD_COUNT);
     }
     return out_period_count;
 }
@@ -111,7 +142,9 @@ static int get_out_period_count() {
 static int get_in_period_ms() {
     static int in_period_ms = -1;
     if (in_period_ms == -1) {
-        in_period_ms = property_get_int32(PROP_KEY_IN_PERIOD_MS, DEFAULT_IN_PERIOD_MS);
+        in_period_ms = audio_get_property(PROP_KEY_IN_PERIOD_MS,
+                                          ARRAY_SIZE(PROP_KEY_IN_PERIOD_MS),
+                                          DEFAULT_IN_PERIOD_MS);
     }
     return in_period_ms;
 }
@@ -119,7 +152,9 @@ static int get_in_period_ms() {
 static int get_in_period_count() {
     static int in_period_count = -1;
     if (in_period_count == -1) {
-        in_period_count = property_get_int32(PROP_KEY_IN_PERIOD_COUNT, DEFAULT_IN_PERIOD_COUNT);
+        in_period_count = audio_get_property(PROP_KEY_IN_PERIOD_COUNT,
+                                             ARRAY_SIZE(PROP_KEY_IN_PERIOD_COUNT),
+                                             DEFAULT_IN_PERIOD_COUNT);
     }
     return in_period_count;
 }