Vlc for Android 全面阐述

大家好，又见面了，我是全栈君。

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：

Vlc for Android 全面阐述

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 __cplusplusdiff --git a/lib/event.c b/lib/event.cindex 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.symindex 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_agldiff --git a/lib/media_player.c b/lib/media_player.cindex 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.cindex 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.cindex 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/

博客站点：http://flavienlaurent.com/

发布者：全栈程序员-用户IM，转载请注明出处：https://javaforall.cn/115777.html原文链接：https://javaforall.cn

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简单介绍

具体解释

1、获代替码

2、编译

3、vlc播放原理

4、缩小延迟

5、加入截图和录制视频

6、实现多路播放

总结

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