멀티미디어 예제

03_day/test-vsync/Android.mk

@@ -0,0 +1,18 @@
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES:= \
+	vsync.cpp
+
+LOCAL_SHARED_LIBRARIES := \
+	libcutils \
+	libutils \
+	libbinder \
+    libui \
+    libgui
+
+LOCAL_MODULE:= test-vsync-events
+
+LOCAL_MODULE_TAGS := tests
+
+include $(BUILD_EXECUTABLE)

03_day/test-vsync/vsync.cpp

@@ -0,0 +1,68 @@
+#include <gui/DisplayEventReceiver.h>
+#include <utils/Looper.h>
+#include <android/looper.h>
+
+using namespace android;
+
+int receiver(int fd, int events, void* data)
+{
+    DisplayEventReceiver* q = (DisplayEventReceiver*)data;
+
+    ssize_t n;
+    DisplayEventReceiver::Event buffer[1];
+
+    static nsecs_t oldTimeStamp = 0;
+
+    while ((n = q->getEvents(buffer, 1)) > 0) {
+        for (int i=0 ; i<n ; i++) {
+            if (buffer[i].header.type == DisplayEventReceiver::DISPLAY_EVENT_VSYNC) {
+                printf("event vsync: count=%d\t", buffer[i].vsync.count);
+            }
+            if (oldTimeStamp) {
+                float t = float(buffer[i].header.timestamp - oldTimeStamp) / s2ns(1);
+                printf("%f ms (%f Hz)\n", t*1000, 1.0/t);
+            }
+            oldTimeStamp = buffer[i].header.timestamp;
+        }
+    }
+    if (n<0) {
+        printf("error reading events (%s)\n", strerror(-n));
+    }
+    return 1;
+}
+
+int main(int argc, char** argv)
+{
+    DisplayEventReceiver myDisplayEvent;
+
+
+    sp<Looper> loop = new Looper(false);
+    loop->addFd(myDisplayEvent.getFd(), 0, ALOOPER_EVENT_INPUT, receiver,
+            &myDisplayEvent);
+
+    myDisplayEvent.setVsyncRate(1);
+
+    do {
+        //printf("about to poll...\n");
+        int32_t ret = loop->pollOnce(-1);
+        switch (ret) {
+            case ALOOPER_POLL_WAKE:
+                //("ALOOPER_POLL_WAKE\n");
+                break;
+            case ALOOPER_POLL_CALLBACK:
+                //("ALOOPER_POLL_CALLBACK\n");
+                break;
+            case ALOOPER_POLL_TIMEOUT:
+                printf("ALOOPER_POLL_TIMEOUT\n");
+                break;
+            case ALOOPER_POLL_ERROR:
+                printf("ALOOPER_POLL_TIMEOUT\n");
+                break;
+            default:
+                printf("ugh? poll returned %d\n", ret);
+                break;
+        }
+    } while (1);
+
+    return 0;
+}