69 lines
2.5 KiB
C++
69 lines
2.5 KiB
C++
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#include "jni.h"
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#include <assert.h>
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#include "cubeb-jni-instances.h"
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#define AUDIO_STREAM_TYPE_MUSIC 3
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struct cubeb_jni {
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jobject s_audio_manager_obj = nullptr;
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jclass s_audio_manager_class = nullptr;
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jmethodID s_get_output_latency_id = nullptr;
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};
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extern "C"
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cubeb_jni *
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cubeb_jni_init()
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{
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jobject ctx_obj = cubeb_jni_get_context_instance();
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JNIEnv * jni_env = cubeb_get_jni_env_for_thread();
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if (!jni_env || !ctx_obj) {
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return nullptr;
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}
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cubeb_jni * cubeb_jni_ptr = new cubeb_jni;
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assert(cubeb_jni_ptr);
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// Find the audio manager object and make it global to call it from another method
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jclass context_class = jni_env->FindClass("android/content/Context");
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jfieldID audio_service_field = jni_env->GetStaticFieldID(context_class, "AUDIO_SERVICE", "Ljava/lang/String;");
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jstring jstr = (jstring)jni_env->GetStaticObjectField(context_class, audio_service_field);
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jmethodID get_system_service_id = jni_env->GetMethodID(context_class, "getSystemService", "(Ljava/lang/String;)Ljava/lang/Object;");
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jobject audio_manager_obj = jni_env->CallObjectMethod(ctx_obj, get_system_service_id, jstr);
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cubeb_jni_ptr->s_audio_manager_obj = reinterpret_cast<jobject>(jni_env->NewGlobalRef(audio_manager_obj));
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// Make the audio manager class a global reference in order to preserve method id
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jclass audio_manager_class = jni_env->FindClass("android/media/AudioManager");
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cubeb_jni_ptr->s_audio_manager_class = reinterpret_cast<jclass>(jni_env->NewGlobalRef(audio_manager_class));
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cubeb_jni_ptr->s_get_output_latency_id = jni_env->GetMethodID (audio_manager_class, "getOutputLatency", "(I)I");
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jni_env->DeleteLocalRef(ctx_obj);
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jni_env->DeleteLocalRef(context_class);
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jni_env->DeleteLocalRef(jstr);
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jni_env->DeleteLocalRef(audio_manager_obj);
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jni_env->DeleteLocalRef(audio_manager_class);
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return cubeb_jni_ptr;
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}
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extern "C"
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int cubeb_get_output_latency_from_jni(cubeb_jni * cubeb_jni_ptr)
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{
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assert(cubeb_jni_ptr);
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JNIEnv * jni_env = cubeb_get_jni_env_for_thread();
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return jni_env->CallIntMethod(cubeb_jni_ptr->s_audio_manager_obj, cubeb_jni_ptr->s_get_output_latency_id, AUDIO_STREAM_TYPE_MUSIC); //param: AudioManager.STREAM_MUSIC
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}
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extern "C"
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void cubeb_jni_destroy(cubeb_jni * cubeb_jni_ptr)
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{
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assert(cubeb_jni_ptr);
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JNIEnv * jni_env = cubeb_get_jni_env_for_thread();
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assert(jni_env);
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jni_env->DeleteGlobalRef(cubeb_jni_ptr->s_audio_manager_obj);
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jni_env->DeleteGlobalRef(cubeb_jni_ptr->s_audio_manager_class);
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delete cubeb_jni_ptr;
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}
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