vlc-android要怎么用
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解决时间 2021-03-11 19:36
- 提问者网友:欺烟
- 2021-03-11 07:20
vlc-android要怎么用
最佳答案
- 五星知识达人网友:北城痞子
- 2021-03-11 08:56
做vlc-android移植的道友都应该知道,当编译完vlc-android 源码后EventManager.java
类中定义了许多事件,下面是源码一部分:
public class EventManager {
//public static final int MediaMetaChanged = 0;
//public static final int MediaSubItemAdded = 1;
//public static final int MediaDurationChanged = 2;
//public static final int MediaParsedChanged = 3;
//public static final int MediaFreed = 4;
//public static final int MediaStateChanged = 5;
//public static final int MediaPlayerMediaChanged = 0x100;
//public static final int MediaPlayerNothingSpecial = 0x101;
//public static final int MediaPlayerOpening = 0x102;
//public static final int MediaPlayerBuffering = 0x103;
public static final int MediaPlayerPlaying = 0x104;
public static final int MediaPlayerPaused = 0x105;
public static final int MediaPlayerStopped = 0x106;
......
}
可是对于这些事件有很多都被注释掉了,当我们需要被注释掉的事件时,就算把注释拿掉,再调用mEventManager.addHandler(EventManager.getInstance())添加事件之后,也不会在定义的mEventHandler
的handleMessage()中监听到,下面为一个mEventHandler定义的demo:
[java] view plaincopy
private final VideoEventHandler mEventHandler = new VideoEventHandler(this);
private class VideoEventHandler extends WeakHandler<DtvPlayer>{
public VideoEventHandler(DtvPlayer owner) {
super(owner);
}
@Override
public void handleMessage(Message msg) {
DtvPlayer activity = getOwner();
if(activity == null) return;
switch (msg.getData().getInt("event")) {
case EventManager.MediaPlayerBuffering:
Log.d(TAG, "MediaPlayerBuffering");
break;
case EventManager.MediaPlayerEncounteredError:
Log.d(TAG, "MediaPlayerEncounteredError");
break;
......
default:
Log.e(TAG, String.format("Event not handled (0x%x)", msg.getData().getInt("event")));
break;
}
super.handleMessage(msg);
}
}
那么如何才能够在mEventHandler中监听到我们需要的事件呢,下面将进入主题。
在libvlcjni.c中有一个静态常量,其中指定了我们目前需要获取哪些事件:
[html] view plaincopy
static const libvlc_event_type_t mp_events[] = {
libvlc_MediaPlayerPlaying,
libvlc_MediaPlayerPaused,
libvlc_MediaPlayerEndReached,
libvlc_MediaPlayerStopped,
libvlc_MediaPlayerVout,
libvlc_MediaPlayerPositionChanged
};
你可以将自己需要的事件添加在里面,然后将EventManager中响应的事件注释拿掉,之后重新编译源码就可以再mEventHandler中获取你刚添加的事件了。
(例如:你要想获取MediaPlayerEncounteredError事件,先将libvlc_MediaPlayerEncounteredError添加在mp_events[]静态常量中(注意,这里前面多了libvlc_),然后把EventManager中的public
static final int MediaPlayerEncounteredError =
0x10a;注释拿掉,重新编译源码之后就可以在你得mEventHandler
的handleMessage()中获取到EventManger.MediaPlayerEncounteredError事件)。
在vlc-android/vlc/lib/event.c中定义了所有事件:
[cpp] view plaincopy
#define DEF( a ) { libvlc_##a, #a, },
typedef struct
{
int type;
const char name[40];
} event_name_t;
static const event_name_t event_list[] = {
DEF(MediaMetaChanged)
DEF(MediaSubItemAdded)
DEF(MediaDurationChanged)
DEF(MediaParsedChanged)
DEF(MediaFreed)
DEF(MediaStateChanged)
DEF(MediaPlayerMediaChanged)
DEF(MediaPlayerNothingSpecial)
DEF(MediaPlayerOpening)
DEF(MediaPlayerBuffering)
DEF(MediaPlayerPlaying)
DEF(MediaPlayerPaused)
DEF(MediaPlayerStopped)
DEF(MediaPlayerForward)
DEF(MediaPlayerBackward)
DEF(MediaPlayerEndReached)
DEF(MediaPlayerEncounteredError)
DEF(MediaPlayerTimeChanged)
DEF(MediaPlayerPositionChanged)
DEF(MediaPlayerSeekableChanged)
DEF(MediaPlayerPausableChanged)
DEF(MediaPlayerTitleChanged)
DEF(MediaPlayerSnapshotTaken)
DEF(MediaPlayerLengthChanged)
DEF(MediaPlayerVout)
DEF(MediaListItemAdded)
DEF(MediaListWillAddItem)
DEF(MediaListItemDeleted)
DEF(MediaListWillDeleteItem)
DEF(MediaListViewItemAdded)
DEF(MediaListViewWillAddItem)
DEF(MediaListViewItemDeleted)
DEF(MediaListViewWillDeleteItem)
DEF(MediaListPlayerPlayed)
DEF(MediaListPlayerNextItemSet)
DEF(MediaListPlayerStopped)
DEF(MediaDiscovererStarted)
DEF(MediaDiscovererEnded)
DEF(VlmMediaAdded)
DEF(VlmMediaRemoved)
DEF(VlmMediaChanged)
DEF(VlmMediaInstanceStarted)
DEF(VlmMediaInstanceStopped)
DEF(VlmMediaInstanceStatusInit)
DEF(VlmMediaInstanceStatusOpening)
DEF(VlmMediaInstanceStatusPlaying)
DEF(VlmMediaInstanceStatusPause)
DEF(VlmMediaInstanceStatusEnd)
DEF(VlmMediaInstanceStatusError)
};
#undef DEF
其中DEF()将MediaPlayerEncounteredError定义为libvlc_MediaPlayerEncounteredError,当本地代码产生MediaPlayerEncounteredError事件时会将libvlc_MediaPlayerEncounteredError传递给jni,与此同时jni又会传递给java层。不管是本地libvlc_MediaPlayerEncounteredError还是java层MediaPlayerEncounteredError,对于同一个事件被定义的值都是相同的,传输的是同一个消息值。本地代码定义在vlc-android/vlc/include/libvlc_events.h,
java代码定义在EventManager.java中。
类中定义了许多事件,下面是源码一部分:
public class EventManager {
//public static final int MediaMetaChanged = 0;
//public static final int MediaSubItemAdded = 1;
//public static final int MediaDurationChanged = 2;
//public static final int MediaParsedChanged = 3;
//public static final int MediaFreed = 4;
//public static final int MediaStateChanged = 5;
//public static final int MediaPlayerMediaChanged = 0x100;
//public static final int MediaPlayerNothingSpecial = 0x101;
//public static final int MediaPlayerOpening = 0x102;
//public static final int MediaPlayerBuffering = 0x103;
public static final int MediaPlayerPlaying = 0x104;
public static final int MediaPlayerPaused = 0x105;
public static final int MediaPlayerStopped = 0x106;
......
}
可是对于这些事件有很多都被注释掉了,当我们需要被注释掉的事件时,就算把注释拿掉,再调用mEventManager.addHandler(EventManager.getInstance())添加事件之后,也不会在定义的mEventHandler
的handleMessage()中监听到,下面为一个mEventHandler定义的demo:
[java] view plaincopy
private final VideoEventHandler mEventHandler = new VideoEventHandler(this);
private class VideoEventHandler extends WeakHandler<DtvPlayer>{
public VideoEventHandler(DtvPlayer owner) {
super(owner);
}
@Override
public void handleMessage(Message msg) {
DtvPlayer activity = getOwner();
if(activity == null) return;
switch (msg.getData().getInt("event")) {
case EventManager.MediaPlayerBuffering:
Log.d(TAG, "MediaPlayerBuffering");
break;
case EventManager.MediaPlayerEncounteredError:
Log.d(TAG, "MediaPlayerEncounteredError");
break;
......
default:
Log.e(TAG, String.format("Event not handled (0x%x)", msg.getData().getInt("event")));
break;
}
super.handleMessage(msg);
}
}
那么如何才能够在mEventHandler中监听到我们需要的事件呢,下面将进入主题。
在libvlcjni.c中有一个静态常量,其中指定了我们目前需要获取哪些事件:
[html] view plaincopy
static const libvlc_event_type_t mp_events[] = {
libvlc_MediaPlayerPlaying,
libvlc_MediaPlayerPaused,
libvlc_MediaPlayerEndReached,
libvlc_MediaPlayerStopped,
libvlc_MediaPlayerVout,
libvlc_MediaPlayerPositionChanged
};
你可以将自己需要的事件添加在里面,然后将EventManager中响应的事件注释拿掉,之后重新编译源码就可以再mEventHandler中获取你刚添加的事件了。
(例如:你要想获取MediaPlayerEncounteredError事件,先将libvlc_MediaPlayerEncounteredError添加在mp_events[]静态常量中(注意,这里前面多了libvlc_),然后把EventManager中的public
static final int MediaPlayerEncounteredError =
0x10a;注释拿掉,重新编译源码之后就可以在你得mEventHandler
的handleMessage()中获取到EventManger.MediaPlayerEncounteredError事件)。
在vlc-android/vlc/lib/event.c中定义了所有事件:
[cpp] view plaincopy
#define DEF( a ) { libvlc_##a, #a, },
typedef struct
{
int type;
const char name[40];
} event_name_t;
static const event_name_t event_list[] = {
DEF(MediaMetaChanged)
DEF(MediaSubItemAdded)
DEF(MediaDurationChanged)
DEF(MediaParsedChanged)
DEF(MediaFreed)
DEF(MediaStateChanged)
DEF(MediaPlayerMediaChanged)
DEF(MediaPlayerNothingSpecial)
DEF(MediaPlayerOpening)
DEF(MediaPlayerBuffering)
DEF(MediaPlayerPlaying)
DEF(MediaPlayerPaused)
DEF(MediaPlayerStopped)
DEF(MediaPlayerForward)
DEF(MediaPlayerBackward)
DEF(MediaPlayerEndReached)
DEF(MediaPlayerEncounteredError)
DEF(MediaPlayerTimeChanged)
DEF(MediaPlayerPositionChanged)
DEF(MediaPlayerSeekableChanged)
DEF(MediaPlayerPausableChanged)
DEF(MediaPlayerTitleChanged)
DEF(MediaPlayerSnapshotTaken)
DEF(MediaPlayerLengthChanged)
DEF(MediaPlayerVout)
DEF(MediaListItemAdded)
DEF(MediaListWillAddItem)
DEF(MediaListItemDeleted)
DEF(MediaListWillDeleteItem)
DEF(MediaListViewItemAdded)
DEF(MediaListViewWillAddItem)
DEF(MediaListViewItemDeleted)
DEF(MediaListViewWillDeleteItem)
DEF(MediaListPlayerPlayed)
DEF(MediaListPlayerNextItemSet)
DEF(MediaListPlayerStopped)
DEF(MediaDiscovererStarted)
DEF(MediaDiscovererEnded)
DEF(VlmMediaAdded)
DEF(VlmMediaRemoved)
DEF(VlmMediaChanged)
DEF(VlmMediaInstanceStarted)
DEF(VlmMediaInstanceStopped)
DEF(VlmMediaInstanceStatusInit)
DEF(VlmMediaInstanceStatusOpening)
DEF(VlmMediaInstanceStatusPlaying)
DEF(VlmMediaInstanceStatusPause)
DEF(VlmMediaInstanceStatusEnd)
DEF(VlmMediaInstanceStatusError)
};
#undef DEF
其中DEF()将MediaPlayerEncounteredError定义为libvlc_MediaPlayerEncounteredError,当本地代码产生MediaPlayerEncounteredError事件时会将libvlc_MediaPlayerEncounteredError传递给jni,与此同时jni又会传递给java层。不管是本地libvlc_MediaPlayerEncounteredError还是java层MediaPlayerEncounteredError,对于同一个事件被定义的值都是相同的,传输的是同一个消息值。本地代码定义在vlc-android/vlc/include/libvlc_events.h,
java代码定义在EventManager.java中。
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