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Kay Schröer authored and Kay Schröer committed Jul 28, 2018
1 parent e69600d commit 073a37e
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29 changes: 29 additions & 0 deletions C/MediaPlayerJNI.h
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245 changes: 245 additions & 0 deletions C/WinmmNative.c
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#include <jni.h>
#include <malloc.h>
#include <windows.h>
#include "MediaPlayerJNI.h"

JNIEXPORT jboolean JNICALL Java_com_mplayer_MediaPlayerJNI_mciGetErrorString
(JNIEnv *env, jclass clazz, jlong mciErr, jobject text, jint length)
{
jfieldID pointerField = (*env)->GetFieldID(env, text, "pointer", "Ljava/lang/String;");

if (pointerField != NULL) {
MCIERROR wError = (MCIERROR) mciErr;
UINT uLength = (UINT) length;
char *lpszErrorText = (char *) malloc(sizeof(char) * uLength);

BOOL bReturn = mciGetErrorString(wError, lpszErrorText, uLength);

jstring jerrorText = (*env)->NewStringUTF(env, lpszErrorText);
(*env)->SetObjectField(env, text, pointerField, jerrorText);
free(lpszErrorText);

return bReturn;
} else {
return FALSE;
}
}

JNIEXPORT jlong JNICALL Java_com_mplayer_MediaPlayerJNI_mciSendCommand
(JNIEnv *env, jclass clazz, jint mciId, jint message, jlong param1, jobject param2)
{
MCIDEVICEID wDeviceID = (MCIDEVICEID) mciId;
UINT uMessage = (UINT) message;
DWORD dwFlags = (DWORD) param1;

switch (uMessage) {
case MCI_CLOSE:
{
jclass closeParams = (*env)->FindClass(env, "Lcom/mplayer/structures/MCI_Generic_Parms;");
if (closeParams != NULL) {
MCI_GENERIC_PARMS lpClose;
MCIERROR dwReturn = mciSendCommand(wDeviceID, uMessage, dwFlags, (DWORD_PTR) &lpClose);
return dwReturn;
}
}
break;
case MCI_GETDEVCAPS:
{
jclass getDevCapsParams = (*env)->FindClass(env, "Lcom/mplayer/structures/MCI_GetDevCaps_Parms;");
if (getDevCapsParams != NULL) {
jfieldID returnField = (*env)->GetFieldID(env, getDevCapsParams, "dwReturn", "J");
jfieldID itemField = (*env)->GetFieldID(env, getDevCapsParams, "dwItem", "J");

if (returnField != NULL && itemField != NULL) {
MCI_GETDEVCAPS_PARMS lpGetDevCaps;
lpGetDevCaps.dwReturn = (DWORD) (*env)->GetLongField(env, param2, returnField);
lpGetDevCaps.dwItem = (DWORD) (*env)->GetLongField(env, param2, itemField);

MCIERROR dwReturn = mciSendCommand(wDeviceID, uMessage, dwFlags, (DWORD_PTR) &lpGetDevCaps);
(*env)->SetLongField(env, param2, returnField, lpGetDevCaps.dwReturn);
(*env)->SetLongField(env, param2, itemField, lpGetDevCaps.dwItem);

return dwReturn;
}
}
}
break;
case MCI_OPEN:
{
jclass openParams = (*env)->FindClass(env, "Lcom/mplayer/structures/MCI_Open_Parms;");
if (openParams != NULL) {
jfieldID deviceIDField = (*env)->GetFieldID(env, openParams, "wDeviceID", "I");
jfieldID deviceTypeField = (*env)->GetFieldID(env, openParams, "lpstrDeviceType", "Ljava/lang/String;");
jfieldID elementNameField = (*env)->GetFieldID(env, openParams, "lpstrElementName", "Ljava/lang/String;");

if (deviceIDField != NULL && deviceTypeField != NULL && elementNameField != NULL) {
jstring jdevType = (*env)->GetObjectField(env, param2, deviceTypeField);
const char *deviceType = (*env)->GetStringUTFChars(env, jdevType, NULL);
jstring jelemName = (*env)->GetObjectField(env, param2, elementNameField);
const char *elementName = (*env)->GetStringUTFChars(env, jelemName, NULL);

MCI_OPEN_PARMS lpOpen;
lpOpen.wDeviceID = 0;
lpOpen.lpstrDeviceType = deviceType;
lpOpen.lpstrElementName = elementName;

MCIERROR dwReturn = mciSendCommand(wDeviceID, uMessage, dwFlags, (DWORD_PTR) &lpOpen);
(*env)->SetIntField(env, param2, deviceIDField, lpOpen.wDeviceID);

(*env)->ReleaseStringUTFChars(env, jdevType, deviceType);
(*env)->ReleaseStringUTFChars(env, jelemName, elementName);

return dwReturn;
}
}
}
break;
case MCI_PAUSE:
{
jclass pauseParams = (*env)->FindClass(env, "Lcom/mplayer/structures/MCI_Generic_Parms;");
if (pauseParams != NULL) {
MCI_GENERIC_PARMS lpPause;
MCIERROR dwReturn = mciSendCommand(wDeviceID, uMessage, dwFlags, (DWORD_PTR) &lpPause);
return dwReturn;
}
}
break;
case MCI_PLAY:
{
jclass playParams = (*env)->FindClass(env, "Lcom/mplayer/structures/MCI_Play_Parms;");
if (playParams != NULL) {
jfieldID fromField = (*env)->GetFieldID(env, playParams, "dwFrom", "J");
jfieldID toField = (*env)->GetFieldID(env, playParams, "dwTo", "J");

if (fromField != NULL && toField != NULL) {
MCI_PLAY_PARMS lpPlay;
lpPlay.dwFrom = (DWORD) (*env)->GetLongField(env, param2, fromField);
lpPlay.dwTo = (DWORD) (*env)->GetLongField(env, param2, toField);

MCIERROR dwReturn = mciSendCommand(wDeviceID, uMessage, dwFlags, (DWORD_PTR) &lpPlay);
return dwReturn;
}
}
}
break;
case MCI_RECORD:
{
jclass recordParams = (*env)->FindClass(env, "Lcom/mplayer/structures/MCI_Record_Parms;");
if (recordParams != NULL) {
jfieldID fromField = (*env)->GetFieldID(env, recordParams, "dwFrom", "J");
jfieldID toField = (*env)->GetFieldID(env, recordParams, "dwTo", "J");

if (fromField != NULL && toField != NULL) {
MCI_RECORD_PARMS lpRecord;
lpRecord.dwFrom = (DWORD) (*env)->GetLongField(env, param2, fromField);
lpRecord.dwTo = (DWORD) (*env)->GetLongField(env, param2, toField);

MCIERROR dwReturn = mciSendCommand(wDeviceID, uMessage, dwFlags, (DWORD_PTR) &lpRecord);
return dwReturn;
}
}
}
break;
case MCI_RESUME:
{
jclass resumeParams = (*env)->FindClass(env, "Lcom/mplayer/structures/MCI_Generic_Parms;");
if (resumeParams != NULL) {
MCI_GENERIC_PARMS lpResume;
MCIERROR dwReturn = mciSendCommand(wDeviceID, uMessage, dwFlags, (DWORD_PTR) &lpResume);
return dwReturn;
}
}
break;
case MCI_SAVE:
{
jclass saveParams = (*env)->FindClass(env, "Lcom/mplayer/structures/MCI_Save_Parms;");
if (saveParams != NULL) {
jfieldID filenameField = (*env)->GetFieldID(env, saveParams, "lpfilename", "Ljava/lang/String;");

if (filenameField != NULL) {
jstring jfileName = (*env)->GetObjectField(env, param2, filenameField);
const char *fileName = (*env)->GetStringUTFChars(env, jfileName, NULL);

MCI_SAVE_PARMS lpSave;
lpSave.lpfilename = fileName;

MCIERROR dwReturn = mciSendCommand(wDeviceID, uMessage, dwFlags, (DWORD_PTR) &lpSave);
(*env)->ReleaseStringUTFChars(env, jfileName, fileName);

return dwReturn;
}
}
}
break;
case MCI_SEEK:
{
jclass seekParams = (*env)->FindClass(env, "Lcom/mplayer/structures/MCI_Seek_Parms;");
if (seekParams != NULL) {
jfieldID toField = (*env)->GetFieldID(env, seekParams, "dwTo", "J");

if (toField != NULL) {
MCI_SEEK_PARMS lpSeek;
lpSeek.dwTo = (DWORD) (*env)->GetLongField(env, param2, toField);

MCIERROR dwReturn = mciSendCommand(wDeviceID, uMessage, dwFlags, (DWORD_PTR) &lpSeek);
return dwReturn;
}
}
}
break;
case MCI_SET:
{
jclass setParams = (*env)->FindClass(env, "Lcom/mplayer/structures/MCI_Set_Parms;");
if (setParams != NULL) {
jfieldID timeFormatField = (*env)->GetFieldID(env, setParams, "dwTimeFormat", "J");
jfieldID audioField = (*env)->GetFieldID(env, setParams, "dwAudio", "J");

if (timeFormatField != NULL && audioField != NULL) {
MCI_SET_PARMS lpSet;
lpSet.dwTimeFormat = (DWORD) (*env)->GetLongField(env, param2, timeFormatField);
lpSet.dwAudio = (DWORD) (*env)->GetLongField(env, param2, audioField);

MCIERROR dwReturn = mciSendCommand(wDeviceID, uMessage, dwFlags, (DWORD_PTR) &lpSet);
return dwReturn;
}
}
}
break;
case MCI_STATUS:
{
jclass statusParams = (*env)->FindClass(env, "Lcom/mplayer/structures/MCI_Status_Parms;");
if (statusParams != NULL) {
jfieldID returnField = (*env)->GetFieldID(env, statusParams, "dwReturn", "J");
jfieldID itemField = (*env)->GetFieldID(env, statusParams, "dwItem", "J");
jfieldID trackField = (*env)->GetFieldID(env, statusParams, "dwTrack", "J");

if (returnField != NULL && itemField != NULL && trackField != NULL) {
MCI_STATUS_PARMS lpStatus;
lpStatus.dwReturn = (DWORD) (*env)->GetLongField(env, param2, returnField);
lpStatus.dwItem = (DWORD) (*env)->GetLongField(env, param2, itemField);
lpStatus.dwTrack = (DWORD) (*env)->GetLongField(env, param2, trackField);

MCIERROR dwReturn = mciSendCommand(wDeviceID, uMessage, dwFlags, (DWORD_PTR) &lpStatus);
(*env)->SetLongField(env, param2, returnField, lpStatus.dwReturn);
(*env)->SetLongField(env, param2, itemField, lpStatus.dwItem);
(*env)->SetLongField(env, param2, trackField, lpStatus.dwTrack);

return dwReturn;
}
}
}
break;
case MCI_STOP:
{
jclass stopParams = (*env)->FindClass(env, "Lcom/mplayer/structures/MCI_Generic_Parms;");
if (stopParams != NULL) {
MCI_GENERIC_PARMS lpStop;
MCIERROR dwReturn = mciSendCommand(wDeviceID, uMessage, dwFlags, (DWORD_PTR) &lpStop);
return dwReturn;
}
}
break;
}

return 0;
}
15 changes: 15 additions & 0 deletions Compile.bat
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@echo off

echo Compiling java classes ...
cd Java
javac com/mplayer/MediaPlayer.java
javac Test.java

echo Generating jni header ...
javah -o ../C/MediaPlayerJNI.h com.mplayer.MediaPlayerJNI
cd ..

echo Building dll library ...
cd C
gcc -Wall -shared WinmmNative.c "-IC:/Program Files/Java/jdk1.8.0_171/include" "-IC:/Program Files/Java/jdk1.8.0_171/include/win32" -o WinmmNative.dll -lwinmm
cd ..
66 changes: 66 additions & 0 deletions Java/Test.java
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import java.util.Scanner;
import com.mplayer.MediaPlayer;

// Simple console player demo

public class Test {

public static void main(String[] args) throws Exception {
MediaPlayer player = new MediaPlayer();
player.setFileName(args[0]);
player.open();

Scanner scanner = new Scanner(System.in);
char c;

do {
System.out.println("a pause\t\ts stop");
System.out.println("i skip\t\tt status");
System.out.println("p play\t\tw rewind");
System.out.println("r resume\t\tx exit");

System.out.print(":");
c = scanner.nextLine().charAt(0);
System.out.println();

switch (c) {
case 'a':
player.pauseOnly();
break;
case 'i':
player.pause();
player.setPosition(player.getPosition() + 30000);
player.play();
break;
case 'p':
player.play();
break;
case 'r':
player.resume();
break;
case 's':
player.stop();
break;
case 't':
long pos = player.getPosition() / 1000;
long len = player.getLength() / 1000;
System.out.println(String.format(
"%02d:%02d / %02d:%02d (%s)",
pos / 60,
pos % 60,
len / 60,
len % 60,
player.getMode()
));
System.out.println();
break;
case 'w':
player.rewind();
break;
}
} while (c != 'x');

player.close();
}

}
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