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