Implement SpeechSynthesis.getSampleRate in Java.

android/jni/jni/eSpeakService.cpp

@@ -112,12 +112,10 @@ enum synthesis_result {
 struct native_data_t {
   JNIEnv *env;
   jobject object;
-  int sampleRate;
 
   native_data_t() {
     env = NULL;
     object = NULL;
-    sampleRate = 0;
   }
 };
 
@@ -172,7 +170,7 @@ JNICALL Java_com_reecedunn_espeak_SpeechSynthesis_nativeClassInit(
   return JNI_TRUE;
 }
 
-JNIEXPORT jboolean
+JNIEXPORT jint
 JNICALL Java_com_reecedunn_espeak_SpeechSynthesis_nativeCreate(
     JNIEnv *env, jobject object, jstring path, jint bufferSizeInMillis) {
   if (DEBUG) LOGV("%s [env=%p, object=%p]", __FUNCTION__, env, object);
@@ -180,7 +178,7 @@ JNICALL Java_com_reecedunn_espeak_SpeechSynthesis_nativeCreate(
 
   if (nat == NULL) {
     LOGE("%s: out of memory!", __FUNCTION__);
-    return JNI_FALSE;
+    return 0;
   }
 
   env->SetIntField(object, FIELD_mNativeData, (jint) nat);
@@ -189,11 +187,11 @@ JNICALL Java_com_reecedunn_espeak_SpeechSynthesis_nativeCreate(
 
   nat->object = env->NewWeakGlobalRef(object);
   if (DEBUG) LOGV("Initializing with path %s", c_path);
-  nat->sampleRate = espeak_Initialize(AUDIO_OUTPUT_SYNCHRONOUS, bufferSizeInMillis, c_path, 0);
+  int sampleRate = espeak_Initialize(AUDIO_OUTPUT_SYNCHRONOUS, bufferSizeInMillis, c_path, 0);
 
   if (c_path) env->ReleaseStringUTFChars(path, c_path);
 
-  return (nat->sampleRate > 0) ? JNI_TRUE : JNI_FALSE;
+  return sampleRate;
 }
 
 JNIEXPORT jboolean
@@ -217,14 +215,6 @@ JNICALL Java_com_reecedunn_espeak_SpeechSynthesis_nativeGetVersion(
   return env->NewStringUTF(espeak_Info(NULL));
 }
 
-JNIEXPORT jint
-JNICALL Java_com_reecedunn_espeak_SpeechSynthesis_nativeGetSampleRate(
-    JNIEnv *env, jobject object) {
-  if (DEBUG) LOGV("%s", __FUNCTION__);
-  const native_data_t *nat = getNativeData(env, object);
-  return (jint)(nat ? nat->sampleRate : 0);
-}
-
 JNIEXPORT jobjectArray
 JNICALL Java_com_reecedunn_espeak_SpeechSynthesis_nativeGetAvailableVoices(
     JNIEnv *env, jobject object) {

android/src/com/reecedunn/espeak/SpeechSynthesis.java

@@ -65,6 +65,7 @@ public class SpeechSynthesis {
 
     private boolean mInitialized = false;
     private static int mVoiceCount = 0;
+    private int mSampleRate = 0;
 
     public SpeechSynthesis(Context context, SynthReadyCallback callback) {
         // First, ensure the data directory exists, otherwise init will crash.
@@ -96,7 +97,7 @@ public class SpeechSynthesis {
     }
 
     public int getSampleRate() {
-        return nativeGetSampleRate();
+        return mSampleRate;
     }
 
     public int getChannelCount() {
@@ -108,9 +109,7 @@ public class SpeechSynthesis {
     }
 
     public int getBufferSizeInBytes() {
-        final int bufferSizeInMillis = BUFFER_SIZE_IN_MILLIS;
-        final int sampleRate = nativeGetSampleRate();
-        return (bufferSizeInMillis * sampleRate) / 1000;
+        return (BUFFER_SIZE_IN_MILLIS * mSampleRate) / 1000;
     }
 
     public List<Voice> getAvailableVoices() {
@@ -311,7 +310,8 @@ public class SpeechSynthesis {
             return;
         }
 
-        if (!nativeCreate(mDatapath, BUFFER_SIZE_IN_MILLIS)) {
+        mSampleRate = nativeCreate(mDatapath, BUFFER_SIZE_IN_MILLIS);
+        if (mSampleRate == 0) {
             Log.e(TAG, "Failed to initialize speech synthesis library");
             return;
         }
@@ -337,14 +337,12 @@ public class SpeechSynthesis {
 
     private static native final boolean nativeClassInit();
 
-    private native final boolean nativeCreate(String path, int bufferSizeInMillis);
+    private native final int nativeCreate(String path, int bufferSizeInMillis);
 
     private native final boolean nativeDestroy();
 
     private native final static String nativeGetVersion();
 
-    private native final int nativeGetSampleRate();
-
     private native final String[] nativeGetAvailableVoices();
 
     private native final boolean nativeSetVoiceByName(String name);