Adds basic support for native APIs for a local song player.
This commit is contained in:
Markil3
311
player/src/main/c/player.c
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311
player/src/main/c/player.c
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/*
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* Copyright (c) 2021 William Hubbard. All Rights Reserved.
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*/
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#include <jni.h>
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#include <stdio.h>
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static jclass InputStream;
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static jclass AudioStream;
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static jmethodID AudioStream_getHeader;
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static jmethodID AudioStream_getByteStream;
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static jmethodID AudioStream_readInt;
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static jmethodID InputStream_readBuffer;
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static jobject currentFile = NULL;
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/**
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* This function is used to initialize the static reference to java.io.InputStream class.
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*
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* @param env - A reference to the JVM.
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* @param audio - An InputStream instance
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* @return A reference to the InputStream class.
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*/
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jclass getInputStreamClass(JNIEnv *env)
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{
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if (InputStream == 0 )
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{
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jclass tempClass = (*env)->FindClass(env, "java/io/InputStream");
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if (tempClass == 0)
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{
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printf("Could not find class java/io/InputStream");
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return 0;
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}
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InputStream = (*env)->NewGlobalRef(env, tempClass);
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}
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return InputStream;
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}
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/**
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* This function is used to initialize the static reference to the AudioStream class.
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*
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* @param env - A reference to the JVM.
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* @param audio - An AudioStream instance
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* @return A reference to the AudioStream class.
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*/
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jclass getAudioStreamClass(JNIEnv *env, jobject audio)
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{
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if (AudioStream == 0 )
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{
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jclass tempClass = (*env)->GetObjectClass(env, audio);
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if (tempClass == 0)
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{
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printf("Could not find class edu/regis/universeplayer_localPlayer/AudioFile");
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return 0;
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}
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AudioStream = (*env)->NewGlobalRef(env, tempClass);
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}
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return AudioStream;
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}
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/**
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* This function is used to initialize the static reference to AudioStream's getHeader method.
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*
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* @param env - A reference to the JVM.
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* @param audio - An AudioStream instance
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* @return A reference to the getHeader method.
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*/
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jmethodID getHeaderMethod(JNIEnv *env, jobject audio)
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{
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if (AudioStream_getHeader == 0 )
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{
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jclass tempClass = getAudioStreamClass(env, audio);
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if (tempClass == 0)
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{
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return 0;
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}
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AudioStream_getHeader = (*env)->GetMethodID(env, tempClass, "getHeader", "()Lwave/WavHeader;");
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}
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return AudioStream_getHeader;
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}
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/**
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* This function is used to initialize the static reference to AudioStream's getByteStream method.
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*
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* @param env - A reference to the JVM.
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* @param audio - An AudioStream instance
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* @return A reference to the getByteStream method.
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*/
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jmethodID getByteStreamMethod(JNIEnv *env, jobject audio)
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{
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if (AudioStream_getByteStream == 0 )
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{
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jclass tempClass = getAudioStreamClass(env, audio);
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if (tempClass == 0)
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{
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return 0;
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}
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AudioStream_getByteStream = (*env)->GetMethodID(env, tempClass, "getByteStream", "()[B");
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}
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return AudioStream_getByteStream;
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}
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/**
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* This function is used to initialize the static references to AudioStream's read methods.
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*
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* @param env - A reference to the JVM.
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* @param audio - An AudioStream instance
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* @return A reference to the getByteStream method.
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*/
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jmethodID getReadMethod(JNIEnv *env, jobject audio)
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{
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jclass tempClass;
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if (AudioStream_readInt == 0)
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{
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tempClass = getAudioStreamClass(env, audio);
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if (tempClass == 0)
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{
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printf("Could not find AudioStream class");
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}
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else
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{
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AudioStream_readInt = (*env)->GetMethodID(env, tempClass, "read", "()I");
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printf("Found class AudioStream");
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}
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}
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if (InputStream_readBuffer == 0 )
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{
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tempClass = getInputStreamClass(env);
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if (tempClass == 0)
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{
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printf("Could not find InputStream class");
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}
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else
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{
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InputStream_readBuffer = (*env)->GetMethodID(env, tempClass, "read", "([B)I");
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printf("Found class java/io/InputStream");
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}
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}
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return AudioStream_readInt;
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}
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/**
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* Obtains an audio stream's header.
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* @param env - A reference to the JVM.
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* @param stream - The audio stream to obtain the header from
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* @return The header information.
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*/
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jobject getHeader(JNIEnv *env, jobject stream)
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{
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if (AudioStream_getHeader == 0)
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{
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getHeaderMethod(env, stream);
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if (AudioStream_getHeader == 0)
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{
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return 0;
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}
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}
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jobject returnValue = (*env)->CallObjectMethod(env, stream, AudioStream_getHeader);
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return returnValue;
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}
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/**
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* Obtains the original raw byte data for an audio stream's header.
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* @param env - A reference to the JVM.
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* @param stream - The audio stream to obtain the header from.
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* @return The header information.
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*/
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jbyteArray getByteStream(JNIEnv *env, jobject stream)
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{
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if (AudioStream_getByteStream == 0)
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{
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getByteStreamMethod(env, stream);
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if (AudioStream_getByteStream == 0)
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{
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return 0;
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}
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}
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jbyteArray returnValue = (jbyteArray) (*env)->CallObjectMethod(env, stream, AudioStream_getByteStream);
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return returnValue;
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}
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/**
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* Reads a single integer from the audio stream.
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* @param env - A reference to the JVM.
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* @param stream - The audio stream to obtain the header from.
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* @return The integer read.
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*/
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int readInt(JNIEnv *env, jobject stream)
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{
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if (AudioStream_readInt == 0)
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{
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getReadMethod(env, stream);
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if (AudioStream_readInt == 0)
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{
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return 0;
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}
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}
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jint returnValue = (*env)->CallIntMethod(env, stream, AudioStream_readInt);
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return (int) returnValue;
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}
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/**
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* Fills a provided buffer with input from the audio stream.
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* @param env - A reference to the JVM.
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* @param stream - The audio stream to obtain the header from.
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* @param buffer - The buffer to read information to
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* @param bufferSize - The size of the buffer
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* @return How much information was actually read.
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*/
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int readBuffer(JNIEnv *env, jobject stream, char* buffer, int bufferSize)
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{
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if (InputStream_readBuffer == 0)
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{
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getReadMethod(env, stream);
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if (InputStream_readBuffer == 0)
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{
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printf("readBuffer method not found\n");
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return 0;
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}
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if (AudioStream_readInt == 0)
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{
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printf("readInt method not found\n");
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return 0;
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}
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}
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jbyteArray jbuffer = (*env)->NewByteArray(env, bufferSize);
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jint returnValue = (*env)->CallIntMethod(env, stream, InputStream_readBuffer, jbuffer);
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jbyte *jbufferEl = (*env)->GetByteArrayElements(env, jbuffer, 0);
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for (int i = 0; i < returnValue; i++)
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{
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buffer[i] = jbufferEl[i];
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}
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(*env)->ReleaseByteArrayElements(env, jbuffer, jbufferEl, 0);
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return returnValue;
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}
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/**
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* Sets the file currently being used
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*/
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JNIEXPORT jint JNICALL Java_edu_regis_universeplayer_localPlayer_Player_setCurrentFile(JNIEnv *env, jobject obj, jobject stream, jshort numChannels, jshort bitsPerSample, jint sampleRate)
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{
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if (currentFile != NULL)
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{
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(*env)->DeleteLocalRef(env, currentFile);
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}
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currentFile = (*env)->NewGlobalRef(env, stream);
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printf("Setting File\n");
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return 0;
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}
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JNIEXPORT void JNICALL Java_edu_regis_universeplayer_localPlayer_Player_save(JNIEnv *env, jobject obj, jstring location)
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{
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int BUFFER_SIZE = 256;
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char buffer[BUFFER_SIZE];
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int read;
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FILE *output;
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char buf[128];
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const char *locationPath = (*env)->GetStringUTFChars(env, location, 0);
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output = fopen(locationPath, "w");
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if (output == NULL)
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{
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printf("File %s can't be opened\n", locationPath);
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return;
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}
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// Obtains header data
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jbyteArray headerData = getByteStream(env, currentFile);
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jsize headerLength = (*env)->GetArrayLength(env, headerData);
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jbyte* header = (*env)->GetByteArrayElements(env, headerData, 0);
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char headerBuff[headerLength];
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for (int i = 0; i < headerLength; i++)
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{
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headerBuff[i] = header[i];
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}
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fwrite(headerBuff, headerLength, 1, output);
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(*env)->ReleaseByteArrayElements(env, headerData, header, 0);
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// Writes the actual file
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read = readBuffer(env, currentFile, headerBuff, BUFFER_SIZE);
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while (read > 0)
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{
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fwrite(headerBuff, read, 1, output);
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read = readBuffer(env, currentFile, headerBuff, BUFFER_SIZE);
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}
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fclose(output);
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(*env)->ReleaseStringUTFChars(env, location, locationPath);
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return;
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}
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JNIEXPORT void JNICALL Java_edu_regis_universeplayer_localPlayer_Player_play(JNIEnv *env, jobject obj)
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{
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printf("Playing\n");
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return;
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}
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JNIEXPORT void JNICALL Java_edu_regis_universeplayer_localPlayer_Player_pause(JNIEnv *env, jobject obj)
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{
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printf("Pausing\n");
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return;
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}
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JNIEXPORT jboolean JNICALL Java_edu_regis_universeplayer_localPlayer_Player_isPaused(JNIEnv *env, jobject obj)
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{
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printf("Is Paused?\n");
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return JNI_FALSE;
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}
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