Vlc for Android 全面阐述

Posted 2020-06-18 yxwkaifa

简单介绍

Vlc for android是一款开源安卓播放器。具备播放多媒体文件、光盘、设备以及网络流媒体协议等功能，支持ARMv7 CPU或一个x86 CPU的设备，全部播放控制特性都已经开发完整。

以下将介绍怎样获代替码、编译、vlc原理、缩小延迟、加入截图和录制视频、多路播放等。

具体解释

1、获代替码

官网源代码下载：http://mirror.us.leaseweb.net/videolan/

git获取：clone from git://git.videolan.org/vlc-ports/android.git

补丁：https://patches.videolan.org/

2、编译

1、搭配环境
AndroidSDK：adt-bundle-linux-x86-20130522
JDK：jdk-7u25-linux-i586
NDK：android-ndk-r8e-linux-x86

2、安装工具
apt-get install gcc
apt-get install g++
apt-get build-dep vlc 
apt-get install git 
apt-get install wget 
apt-get install autoconf
apt-get install libtool
apt-get install subversion 
apt-get install cmake
apt-get install ant

3、配置信息

export ANDROID_NDK=/home/mythou/android-dev/android-ndk-r8e
export NDKR5C=/home/mythou/ndkr5c
export NDKR6B=/home/mythou/ndkr6b
PATH=$PATH:$NDKR6B:$ANDROID_NDK

export ANDROID_ABI=armeabi-v7a

export JAVA_HOME=/home/mythou/android-dev/jdk/jdk1.7.0_25
export JRE_HOME=/home/mythou/android-dev/jdk/jdk1.7.0_25/jre
export CLASSPATH=.:$CLASSPATH:$JAVA_HOME/lib:$JAVA_HOME/jre/lib
export ANT_HOME=/home/mythou/android-dev/apache-ant-1.8.0
export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH:$HOME/bin:$ANT_HOME

export ANDROID_SDK=/home/mythou/android-dev/adt-bundle-linux-x86-20130522/sdk
PATH=$PATH:$ANDROID_SDK/tools:$ANDROID_SDK/platform-tools

4、编译

sh compile.sh   or    sh compile.sh release

5、辅助库

因为某些原因，有些库无法获得。请手动下载放入便可。

3、vlc播放原理

视频播放的基本步骤：
    1、acess 訪问（获取视频数据）
    2、demux 解复用（音频、视频分离）  
    3、decode 解码（音频和视频的解码）
    4、output 输出（音频和视频的输出（aout和vout）


如图：

4、缩小延迟

改动延迟的方法有两种：1、直接用Java代码实现；2、在vlc库中改动。

涉及延迟的參数有：file-caching（文件缓存）、live-caching（直播缓存）、network-caching（网络缓存）、sout-mux-caching（输出缓存）。

Java代码实现例如以下：

			options.add(":file-caching=1500");//文件缓存
			options.add(":network-caching=1500");//网络缓存
			
			options.add(":live-caching=1500");//直播缓存
			options.add(":sout-mux-caching=1500");//输出缓存
			
			options.add(":codec=mediacodec,iomx,all");

vlc库实现例如以下：

查找目标文件vlc/src/libvlc-module.c  改动相应的參数

    add_integer( "file-caching", DEFAULT_PTS_DELAY / 3000,
                 CACHING_TEXT, CACHING_LONGTEXT, true )
    add_integer( "live-caching", DEFAULT_PTS_DELAY / 3000,
                 CAPTURE_CACHING_TEXT, CAPTURE_CACHING_LONGTEXT, true )
    add_integer( "network-caching", CLOCK_FREQ / 3000,
                 NETWORK_CACHING_TEXT, NETWORK_CACHING_LONGTEXT, true )
    add_integer( "sout-mux-caching", 1000, SOUT_MUX_CACHING_TEXT,
                                SOUT_MUX_CACHING_LONGTEXT, true )

把分母数据增大，缓存的数据就越小，延迟就降低，流畅性就降低，相反。分母数据降低，缓存的数据就越大，延迟就添加，流畅性就添加。

測试结果，延迟明显降低。

5、加入截图和录制视频

官方已给出补丁实现截图和录制视频

1、截图

改动文件： android/configure.sh  搜索内容 -disable-sout   并删除

改动文件：android/vlc/contrib/src/ffmpeg/rules.mak  添加-enable-encoder=png的编码器 实现png格式截图

FFMPEGCONF += --disable-encoders --disable-muxers
 改成FFMPEGCONF += --disable-encoders --enable-encoder=png --disable-muxers

源代码又一次编译便可

编译过程中可能会出现例如以下问题：

./vlc/android/modules/.libs/libvorbis_plugin.a(libvorbis_plugin_la-vorbis.o): in function OpenEncoder:../../modules/codec/vorbis.c:758: error: undefined reference to ‘vorbis_encode_setup_vbr‘

解决方法：
改动文件 vlc-android/jni/Android.mk

 LOCAL_LDLIBS := -L$(VLC_CONTRIB)/lib \  
    $(VLC_MODULES) \  
    $(VLC_BUILD_DIR)/lib/.libs/libvlc.a \  
    $(VLC_BUILD_DIR)/src/.libs/libvlccore.a \  
    $(VLC_BUILD_DIR)/compat/.libs/libcompat.a \  
    -ldl -lz -lm -llog \  
    -ldvbpsi -lebml -lmatroska -ltag \  
    -logg -lFLAC -ltheora -lvorbis -lvorbisfile -lvorbisenc \  
    -lmpeg2 -la52 \  
    -lavformat -lavcodec -lswscale -lavutil -lpostproc -lgsm -lopenjpeg \  
    -lliveMedia -lUsageEnvironment -lBasicUsageEnvironment -lgroupsock \  
    -lspeex -lspeexdsp \  
    -lxml2 -lpng -lgnutls -lgcrypt -lgpg-error \  
    -lnettle -lhogweed -lgmp \  
    -lfreetype -liconv -lass -lfribidi -lopus \  
    -lEGL -lGLESv2 -ljpeg \  
    $(CPP_STATIC)  

在
-logg -lFLAC -ltheora -lvorbis 
后加入
-lvorbisfile -lvorbisenc 

error: undefined reference to ‘vlc_entry__access_output_udp‘

解决方法：
改动文件：/vlc/modules/access_output/Modules.am

SOURCES_access_output_dummy = dummy.c  
    SOURCES_access_output_file = file.c  
    SOURCES_access_output_udp = udp.c  
    SOURCES_access_output_http = http.c bonjour.c bonjour.h  
    SOURCES_access_output_shout = shout.c  
      
      
    access_output_LTLIBRARIES += \  
        libaccess_output_dummy_plugin.la \  
        libaccess_output_file_plugin.la \  
        libaccess_output_udp_plugin.la \  
        libaccess_output_http_plugin.la  
      
      
    #libaccess_output_udp_plugin_la_SOURCES = udp.c  
    #libaccess_output_udp_plugin_la_LIBADD = $(SOCKET_LIBS) $(LIBPTHREAD)  
    #access_output_LTLIBRARIES += libaccess_output_udp_plugin.la  
      
      
    libaccess_output_livehttp_plugin_la_SOURCES = livehttp.c  
    libaccess_output_livehttp_plugin_la_CFLAGS = $(AM_CFLAGS) $(GCRYPT_CFLAGS)  
    libaccess_output_livehttp_plugin_la_LIBADD = $(GCRYPT_LIBS) -lgpg-error  
    if HAVE_GCRYPT  
    access_output_LTLIBRARIES += libaccess_output_livehttp_plugin.la  
    endif  

内容覆盖便可

相关源代码加入：

在libvlcjni.c中添加函数：

boolean Java_org_videolan_libvlc_LibVLC_takeSnapShot(JNIEnv *env, jobject thiz,jint number, jstring path, jint width,jint height)  
{  
    jboolean isCopy;  
   libvlc_media_player_t *mp = getMediaPlayer(env, thiz);  
     /* Get C string */  
   const char* psz_path = (*env)->GetStringUTFChars(env, path, &isCopy);  
  
   if (mp)  
        if(libvlc_video_take_snapshot(mp, (int)number,psz_path , (int)width,(int)height)==0)  
            return JNI_TRUE;  
   return JNI_FALSE;  
  
}  

LibVlc.java中添加native函数的接口和调用方法：

private native boolean takeSnapShot( int num, String file, int width, int height);  

public boolean takeSnapShot(String file, int width, int height) {  
    return takeSnapShot(0, file, width, height);  
} 

2、录制视频

录制补丁  https://patches.videolan.org/patch/606/

补丁内容例如以下：

diff --git a/include/vlc/libvlc_events.h b/include/vlc/libvlc_events.h
index 2cfedbf..25a16ea 100644
--- a/include/vlc/libvlc_events.h
+++ b/include/vlc/libvlc_events.h
@@ -72,6 +72,8 @@ enum libvlc_event_e {
     libvlc_MediaPlayerSnapshotTaken,
     libvlc_MediaPlayerLengthChanged,
     libvlc_MediaPlayerVout,
+    libvlc_MediaPlayerRecordableChanged,
+    libvlc_MediaPlayerRecordingFinished,
 
     libvlc_MediaListItemAdded=0x200,
     libvlc_MediaListWillAddItem,
@@ -165,6 +167,14 @@ typedef struct libvlc_event_t
         } media_player_pausable_changed;
         struct
         {
+            int new_recordable;
+        } media_player_recordable_changed;
+        struct
+        {
+            char *psz_filename;
+        } media_player_recording_finished;
+        struct
+        {
             int new_count;
         } media_player_vout;
 
diff --git a/include/vlc/libvlc_media_player.h b/include/vlc/libvlc_media_player.h
index aefef02..8ddef37 100644
--- a/include/vlc/libvlc_media_player.h
+++ b/include/vlc/libvlc_media_player.h
@@ -1628,6 +1628,121 @@ LIBVLC_API int libvlc_audio_set_delay( libvlc_media_player_t *p_mi, int64_t i_de
 
 /** @} audio */
 
+/**
+ * Can the media player record the current media?

+ *
+ * Media must be buffering or playing before it can be recorded.
+ *
+ * The media player event manager will emit a libvlc_MediaPlayerRecordableChanged event
+ * when the recordable state changes after starting media playback. The event data will
+ * describe the new recordable state, so invocation of this API method is not strictly
+ * necessary to determine when recording can be started.
+ *
+ * A libvlc_MediaPlayerRecordableChanged event will not be emitted if the media is
+ * stopped (notified by a libvlc_MediaPlayerStoppedEvent) or finishes normally (notified
+ * by a libvlc_MediaPlayerFinished event).
+ *
+ * A calling application should therefore register an event callback for those events
+ * so that it may query the new recordable state and manage recording at the appropriate
+ * time.
+ *
+ * \param p_mi media player
+ * \return true if the media player can record, false if it can not
+ * \version LibVLC 2.1.0 or later
+ */
+LIBVLC_API bool libvlc_media_player_is_recordable( libvlc_media_player_t *p_mi );
+
+/**
+ * Is the current media being recorded?
+ *
+ * \param p_mi media player
+ * \return true if recording, false if not
+ * \version LibVLC 2.1.0 or later
+ */
+LIBVLC_API bool libvlc_media_player_is_recording( libvlc_media_player_t *p_mi );
+
+/**
+ * Start recording the current media.
+ *
+ * Media must be buffering or playing before it can be recorded. A calling application
+ * can begin recording immediately on receipt of a libvlc_MediaPlayerRecordableChanged
+ * event sent via the media player event manager (if recording is possible for the
+ * currently playing media), and any time thereafter until the media stops.
+ *
+ * Media will be saved to the file path denoted by the psz_filename parameter if it is
+ * supplied. Any such supplied filename should not include a file extension as the
+ * correct file extension will automatically be appended when the file is created. This
+ * filename may denote a full path name, but each directory in the path must already
+ * exist or recording will silently fail. If the calling application chooses to specify
+ * the filename then it is the responsibility of that application to take account of
+ * this and itself make sure any needed directories are created.
+ *
+ * Alternatively, a calling application need not supply a filename and so instead let
+ * vlc automatically generate a unique filename. This will cause vlc to create a new
+ * file in the appropriate media directory for the user - for example "~/Videos". The
+ * actual filename used will be sent in an event when the recording is complete.
+ *
+ * When recording has finished and the new file has been completely saved, a
+ * libvlc_MediaPlayerRecordingFinished event will be sent via the media player event
+ * manager. The event data will contain the filename of the newly recorded file - this
+ * will either be the filename as specified by the calling application or a filename
+ * generated by vlc if the application did not supply a filename. In either case, this
+ * filename will include the automatically appended file extension.
+ *
+ * The saved media file will not be immediately available or visible until recording
+ * has completely finished and the libvlc_MediaPlayerRecordingFinished event has been
+ * received, or the media has stopped or finished normally.
+ *
+ * Recording can be stopped and started on-the-fly once the recordable state is set;
+ * each time recording is stopped and restarted a new file will be created so a calling
+ * application should take care to provide unique filenames, or defer to vlc to create
+ * unique filenames.
+ *
+ * Recording will be stopped when the media stops playing, and must be explicitly
+ * started again to restart recording, i.e. the recording state is not automatically
+ * preserved when playing media subsequently.
+ *
+ * Media player functionailty such as next/previous chapter, set time or position and
+ * so on are ineffective when recording is enabled. However, pausing the media is
+ * possible and will pause the recording; unpausing the media will resume playback and
+ * recording.
+ *
+ * Recording of the primary media or sub-items is possible.
+ *
+ * \param p_mi media player
+ * \param psz_filename name of the file to save the media to, not including any file extension,
+ *                     or NULL if vlc should generate the filename automatically
+ * \return 0 if recording was started, -1 on error
+ * \version LibVLC 2.1.0 or later
+ */
+LIBVLC_API int libvlc_media_player_record_start( libvlc_media_player_t *p_mi, const char *psz_filename );
+
+/**
+ * Stop recording the current media.
+ *
+ * This method requests that the recording stop, and will return immediately. Recording
+ * will not stop immediately.
+ *
+ * When the recording actually stops some short time later and the new file has
+ * finished being written, a libvlc_MediaPlayerRecordingFinished event will be sent via
+ * the media player event manager. The newly recorded file will not be visible or
+ * available until after this event has been sent.
+ *
+ * The event data will contain the full name of the file that was created. The filename
+ * will either be that as was specified by the calling application on invoking
+ * libvlc_media_player_record_start(), or the filename that vlc automatically generated
+ * if the calling application did not supply its own filename. In either case the
+ * filename will contain the automatically appended file extension.
+ *
+ * There is no need to invoke this method to stop the recording if the media is stopped
+ * or finishes playing normally.
+ *
+ * \param p_mi media player
+ * \return 0 if recording was stopped, -1 on error
+ * \version LibVLC 2.1.0 or later
+ */
+LIBVLC_API int libvlc_media_player_record_stop( libvlc_media_player_t *p_mi );
+
 /** @} media_player */
 
 # ifdef __cplusplus
diff --git a/lib/event.c b/lib/event.c
index c71a48a..7ef4abd 100644
--- a/lib/event.c
+++ b/lib/event.c
@@ -279,6 +279,8 @@ static const event_name_t event_list[] = {
     DEF(MediaPlayerSnapshotTaken)
     DEF(MediaPlayerLengthChanged)
     DEF(MediaPlayerVout)
+    DEF(MediaPlayerRecordableChanged)
+    DEF(MediaPlayerRecordingFinished)
 
     DEF(MediaListItemAdded)
     DEF(MediaListWillAddItem)
diff --git a/lib/libvlc.sym b/lib/libvlc.sym
index 42dad5c..3ff67ef 100644
--- a/lib/libvlc.sym
+++ b/lib/libvlc.sym
@@ -137,6 +137,8 @@ libvlc_media_player_get_title
 libvlc_media_player_get_title_count
 libvlc_media_player_get_xwindow
 libvlc_media_player_has_vout
+libvlc_media_player_is_recordable
+libvlc_media_player_is_recording
 libvlc_media_player_is_seekable
 libvlc_media_player_is_playing
 libvlc_media_player_new
@@ -146,6 +148,8 @@ libvlc_media_player_set_pause
 libvlc_media_player_pause
 libvlc_media_player_play
 libvlc_media_player_previous_chapter
+libvlc_media_player_record_start
+libvlc_media_player_record_stop
 libvlc_media_player_release
 libvlc_media_player_retain
 libvlc_media_player_set_agl
diff --git a/lib/media_player.c b/lib/media_player.c
index a41b8c7..6573197 100644
--- a/lib/media_player.c
+++ b/lib/media_player.c
@@ -64,6 +64,10 @@ input_pausable_changed( vlc_object_t * p_this, char const * psz_cmd,
                         vlc_value_t oldval, vlc_value_t newval,
                         void * p_userdata );
 static int
+input_recordable_changed( vlc_object_t *p_this, char const *psz_cmd,
+                          vlc_value_t oldval, vlc_value_t newval,
+                          void *p_userdata );
+static int
 input_event_changed( vlc_object_t * p_this, char const * psz_cmd,
                      vlc_value_t oldval, vlc_value_t newval,
                      void * p_userdata );
@@ -72,6 +76,10 @@ static int
 snapshot_was_taken( vlc_object_t *p_this, char const *psz_cmd,
                     vlc_value_t oldval, vlc_value_t newval, void *p_data );
 
+static int
+file_recording_finished( vlc_object_t *p_this, char const *psz_cmd,
+                         vlc_value_t oldval, vlc_value_t newval, void *p_data );
+
 static void libvlc_media_player_destroy( libvlc_media_player_t *p_mi );
 
 /*
@@ -132,6 +140,8 @@ static void release_input_thread( libvlc_media_player_t *p_mi, bool b_input_abor
                      input_seekable_changed, p_mi );
     var_DelCallback( p_input_thread, "can-pause",
                     input_pausable_changed, p_mi );
+    var_DelCallback( p_input_thread, "can-record",
+                     input_recordable_changed, p_mi );
     var_DelCallback( p_input_thread, "intf-event",
                      input_event_changed, p_mi );
 
@@ -227,6 +237,25 @@ input_pausable_changed( vlc_object_t * p_this, char const * psz_cmd,
 }
 
 static int
+input_recordable_changed( vlc_object_t *p_this, char const *psz_cmd,
+                          vlc_value_t oldval, vlc_value_t newval,
+                          void *p_userdata )
+{
+    VLC_UNUSED(p_this);
+    VLC_UNUSED(psz_cmd);
+    VLC_UNUSED(oldval);
+
+    libvlc_media_player_t *p_mi = p_userdata;
+    libvlc_event_t event;
+
+    event.type = libvlc_MediaPlayerRecordableChanged;
+    event.u.media_player_recordable_changed.new_recordable = newval.b_bool;
+
+    libvlc_event_send( p_mi->p_event_manager, &event );
+    return VLC_SUCCESS;
+}
+
+static int
 input_event_changed( vlc_object_t * p_this, char const * psz_cmd,
                      vlc_value_t oldval, vlc_value_t newval,
                      void * p_userdata )
@@ -357,6 +386,23 @@ static int snapshot_was_taken(vlc_object_t *p_this, char const *psz_cmd,
     return VLC_SUCCESS;
 }
 
+static int file_recording_finished(vlc_object_t *p_this, char const *psz_cmd,
+                                   vlc_value_t oldval, vlc_value_t newval, void *p_data )
+{
+    VLC_UNUSED(p_this);
+    VLC_UNUSED(psz_cmd);
+    VLC_UNUSED(oldval);
+
+    libvlc_media_player_t *p_mi = p_data;
+    libvlc_event_t event;
+
+    event.type = libvlc_MediaPlayerRecordingFinished;
+    event.u.media_player_recording_finished.psz_filename = newval.psz_string;
+
+    libvlc_event_send(p_mi->p_event_manager, &event);
+    return VLC_SUCCESS;
+}
+
 static input_thread_t *find_input (vlc_object_t *obj)
 {
     libvlc_media_player_t *mp = (libvlc_media_player_t *)obj;
@@ -480,6 +526,10 @@ libvlc_media_player_new( libvlc_instance_t *instance )
     var_Create (mp, "amem-set-volume", VLC_VAR_ADDRESS);
     var_Create (mp, "amem-format", VLC_VAR_STRING | VLC_VAR_DOINHERIT);
     var_Create (mp, "amem-rate", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT);
+
+    var_Create (mp, "recording-finished", VLC_VAR_STRING);
+    var_AddCallback (mp, "recording-finished", file_recording_finished, mp);
+
     var_Create (mp, "amem-channels", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT);
 
     mp->p_md = NULL;
@@ -515,6 +565,9 @@ libvlc_media_player_new( libvlc_instance_t *instance )
     register_event(mp, TitleChanged);
     register_event(mp, PausableChanged);
 
+    register_event(mp, RecordableChanged);
+    register_event(mp, RecordingFinished);
+
     register_event(mp, Vout);
 
     /* Snapshot initialization */
@@ -566,6 +619,8 @@ static void libvlc_media_player_destroy( libvlc_media_player_t *p_mi )
     var_DelCallback( p_mi->p_libvlc,
                      "snapshot-file", snapshot_was_taken, p_mi );
 
+    var_DelCallback( p_mi, "recording-finished", file_recording_finished, p_mi );
+
     /* No need for lock_input() because no other threads knows us anymore */
     if( p_mi->input.p_thread )
         release_input_thread(p_mi, true);
@@ -732,12 +787,14 @@ int libvlc_media_player_play( libvlc_media_player_t *p_mi )
 
     var_AddCallback( p_input_thread, "can-seek", input_seekable_changed, p_mi );
     var_AddCallback( p_input_thread, "can-pause", input_pausable_changed, p_mi );
+    var_AddCallback( p_input_thread, "can-record", input_recordable_changed, p_mi );
     var_AddCallback( p_input_thread, "intf-event", input_event_changed, p_mi );
 
     if( input_Start( p_input_thread ) )
     {
         unlock_input(p_mi);
         var_DelCallback( p_input_thread, "intf-event", input_event_changed, p_mi );
+        var_DelCallback( p_input_thread, "can-record", input_recordable_changed, p_mi );
         var_DelCallback( p_input_thread, "can-pause", input_pausable_changed, p_mi );
         var_DelCallback( p_input_thread, "can-seek", input_seekable_changed, p_mi );
         vlc_object_release( p_input_thread );
@@ -1409,3 +1466,62 @@ void libvlc_media_player_next_frame( libvlc_media_player_t *p_mi )
         vlc_object_release( p_input_thread );
     }
 }
+
+bool libvlc_media_player_is_recordable( libvlc_media_player_t *p_mi )
+{
+    input_thread_t *p_input_thread;
+    bool b_can_record;
+
+    p_input_thread = libvlc_get_input_thread( p_mi );
+    if( !p_input_thread )
+        return false;
+
+    b_can_record = var_GetBool( p_input_thread, "can-record" );
+
+    vlc_object_release( p_input_thread );
+    return b_can_record;
+}
+
+bool libvlc_media_player_is_recording( libvlc_media_player_t *p_mi )
+{
+    input_thread_t *p_input_thread;
+    bool b_record;
+
+    p_input_thread = libvlc_get_input_thread( p_mi );
+    if( !p_input_thread )
+        return false;
+
+    b_record = var_GetBool( p_input_thread, "record" );
+
+    vlc_object_release( p_input_thread );
+    return b_record;
+}
+
+int libvlc_media_player_record_start( libvlc_media_player_t *p_mi, const char* psz_filename )
+{
+    input_thread_t *p_input_thread;
+
+    p_input_thread = libvlc_get_input_thread( p_mi );
+    if( !p_input_thread )
+        return -1;
+
+    var_SetString( p_input_thread, "input-record-path", psz_filename );
+    var_SetBool( p_input_thread, "record", true );
+
+    vlc_object_release( p_input_thread );
+    return 0;
+}
+
+int libvlc_media_player_record_stop( libvlc_media_player_t *p_mi )
+{
+    input_thread_t *p_input_thread;
+
+    p_input_thread = libvlc_get_input_thread( p_mi );
+    if( !p_input_thread )
+        return -1;
+
+    var_SetBool( p_input_thread, "record", false );
+
+    vlc_object_release( p_input_thread );
+    return 0;
+}
diff --git a/modules/stream_out/record.c b/modules/stream_out/record.c
index de6d32e..40ddfea 100644
--- a/modules/stream_out/record.c
+++ b/modules/stream_out/record.c
@@ -110,6 +110,8 @@ struct sout_stream_sys_t
     int              i_id;
     sout_stream_id_t **id;
     mtime_t     i_dts_start;
+
+    char *psz_record_file;
 };
 
 static void OutputStart( sout_stream_t *p_stream );
@@ -158,6 +160,8 @@ static int Open( vlc_object_t *p_this )
     p_sys->i_dts_start = 0;
     TAB_INIT( p_sys->i_id, p_sys->id );
 
+    p_sys->psz_record_file = NULL;
+
     return VLC_SUCCESS;
 }
 
@@ -172,6 +176,19 @@ static void Close( vlc_object_t * p_this )
     if( p_sys->p_out )
         sout_StreamChainDelete( p_sys->p_out, p_sys->p_out );
 
+    if( p_sys->psz_record_file ) {
+        for( vlc_object_t *p_mp = p_stream->p_parent; p_mp; p_mp = p_mp->p_parent )
+        {
+            if( var_Type( p_mp, "recording-finished" ) )
+            {
+                var_SetString( p_mp, "recording-finished", p_sys->psz_record_file );
+                break;
+            }
+        }
+
+        free( p_sys->psz_record_file );
+    }
+
     TAB_CLEAN( p_sys->i_id, p_sys->id );
     free( p_sys->psz_prefix );
     free( p_sys );
@@ -352,7 +369,10 @@ static int OutputNew( sout_stream_t *p_stream,
     }
 
     if( psz_file && psz_extension )
+    {
+        p_sys->psz_record_file = strdup( psz_file );
         var_SetString( p_stream->p_libvlc, "record-file", psz_file );
+    }
 
     free( psz_file );
     free( psz_output );
diff --git a/src/input/var.c b/src/input/var.c
index 9613fe2..04f33b9 100644
--- a/src/input/var.c
+++ b/src/input/var.c
@@ -210,6 +210,9 @@ void input_ControlVarInit ( input_thread_t *p_input )
     text.psz_string = _("Subtitles Track");
     var_Change( p_input, "spu-es", VLC_VAR_SETTEXT, &text, NULL );
 
+    /* ES Out */
+    var_Create( p_input, "input-record-path", VLC_VAR_STRING | VLC_VAR_DOINHERIT );
+
     /* Special read only objects variables for intf */
     var_Create( p_input, "bookmarks", VLC_VAR_STRING | VLC_VAR_DOINHERIT );
 

下载补丁，并把文件放到vlc文件夹中，运行命令patch -p1 < xxxx.patch。因为版本号不一样有些地方会失败。请打开补丁自己检查手动改动。

补丁中主要相关函数：

+bool libvlc_media_player_is_recordable( libvlc_media_player_t *p_mi )
+{
+    input_thread_t *p_input_thread;
+    bool b_can_record;
+
+    p_input_thread = libvlc_get_input_thread( p_mi );
+    if( !p_input_thread )
+        return false;
+
+    b_can_record = var_GetBool( p_input_thread, "can-record" );
+
+    vlc_object_release( p_input_thread );
+    return b_can_record;
+}
+
+bool libvlc_media_player_is_recording( libvlc_media_player_t *p_mi )
+{
+    input_thread_t *p_input_thread;
+    bool b_record;
+
+    p_input_thread = libvlc_get_input_thread( p_mi );
+    if( !p_input_thread )
+        return false;
+
+    b_record = var_GetBool( p_input_thread, "record" );
+
+    vlc_object_release( p_input_thread );
+    return b_record;
+}
+
+int libvlc_media_player_record_start( libvlc_media_player_t *p_mi, const char* psz_filename )
+{
+    input_thread_t *p_input_thread;
+
+    p_input_thread = libvlc_get_input_thread( p_mi );
+    if( !p_input_thread )
+        return -1;
+
+    var_SetString( p_input_thread, "input-record-path", psz_filename );
+    var_SetBool( p_input_thread, "record", true );
+
+    vlc_object_release( p_input_thread );
+    return 0;
+}
+
+int libvlc_media_player_record_stop( libvlc_media_player_t *p_mi )
+{
+    input_thread_t *p_input_thread;
+
+    p_input_thread = libvlc_get_input_thread( p_mi );
+    if( !p_input_thread )
+        return -1;
+
+    var_SetBool( p_input_thread, "record", false );
+
+    vlc_object_release( p_input_thread );
+    return 0;
+}

库调用方法函数例如以下：

jboolean Java_org_videolan_libvlc_LibVLC_takeSnapShot(JNIEnv *env, jobject thiz,jint number, jstring path, jint width,jint height)  
{  
    jboolean isCopy;  
   libvlc_media_player_t *mp = getMediaPlayer(env, thiz);  
     /* Get C string */  
   const char* psz_path = (*env)->GetStringUTFChars(env, path, &isCopy);  
  
   if (mp)  
        if(libvlc_video_take_snapshot(mp, (int)number,psz_path , (int)width,(int)height)==0)  
            return JNI_TRUE;  
   return JNI_FALSE;  
  
}  
  
jboolean Java_org_videolan_libvlc_LibVLC_videoRecordStart(JNIEnv *env, jobject thiz,jstring path)  
{  
    jboolean isCopy;  
   libvlc_media_player_t *mp = getMediaPlayer(env, thiz);  
     /* Get C string */  
   const char* psz_path = (*env)->GetStringUTFChars(env, path, &isCopy);  
   //const char* psz_filename=(*env)->GetStringUTFChars(env, filename, &isCopy);  
   if (mp)  
        if(libvlc_media_player_record_start(mp,psz_path)==0)  
            return JNI_TRUE;  
   return JNI_FALSE;  
}  
  
jboolean Java_org_videolan_libvlc_LibVLC_videoRecordStop(JNIEnv *env, jobject thiz)  
{  
    jboolean isCopy;  
   libvlc_media_player_t *mp = getMediaPlayer(env, thiz);  
     /* Get C string */  
   if (mp)  
        if(libvlc_media_player_record_stop(mp)==0)  
            return JNI_TRUE;  
   return JNI_FALSE;  
}  
  
jboolean Java_org_videolan_libvlc_LibVLC_videoIsRecording(JNIEnv *env, jobject thiz)  
{  
    jboolean isCopy;  
   libvlc_media_player_t *mp = getMediaPlayer(env, thiz);  
   if (mp)  
        if(libvlc_media_player_is_recording(mp))  
            return JNI_TRUE;  
   return JNI_FALSE;  
}  
jboolean Java_org_videolan_libvlc_LibVLC_videoIsRecordable(JNIEnv *env, jobject thiz)  
{  
    jboolean isCopy;  
   libvlc_media_player_t *mp = getMediaPlayer(env, thiz);  
   if (mp)  
        if(libvlc_media_player_is_recordable(mp))  
            return JNI_TRUE;  
   return JNI_FALSE;  
}  
  
jint Java_org_videolan_libvlc_LibVLC_getState(JNIEnv *env, jobject thiz)  
{  
    libvlc_media_player_t *mp = getMediaPlayer(env, thiz);  
    if (mp){  
        libvlc_state_t state=libvlc_media_player_get_state(mp);  
        return (jint)state;  
    }  
    else  
        return -1;  
}

6、实现多路播放

使用process属性实现

总结

接触vlc for android 是帮助朋友完毕一个外单，即实现认证播放器的封装（即加入播放网络视频的认证）。传地址便可播放。

经測试vlc无法播放swf文件，为了弥补这已缺陷，准备加入swfdec到android平台以支持swf文件。

推荐博客站点：http://flavienlaurent.com/

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