WINCE TCPMP应用三:TCPMP的播放模块

首先，我们来看一下TCPMP的播放模块的结构定义：
static const nodedef Player =
{
  sizeof(player_base)|CF_GLOBAL|CF_SETTINGS,
  PLAYER_ID,
  NODE_CLASS,
  PRI_MAXIMUM+600,
  (nodecreate)Create,
  (nodedelete)Delete,
};

绝大多数节点都有一个对应的数据对象，记录该节点的数据和方法，每一个子节点对象都是以父节点对象作为该节点一个元素，类似C++的封装继承机制。如果子节点的父节点没有数据对象，该节点可以从node节点直接继承。每一个节点都可以看成Node节点的直接或间接子节点，所以所有节点头以一个相同的 node结构开头，子节点可能还有自己的属性，在继承父对象后就是子节点自己的元素。
    typedef struct node
{
  int   Class;
  nodeenum Enum;
  nodeget  Get;
  nodeset  Set;
} node;

Class表示该对象的标识，如PLAYER_ID。
     Enum是一个函数指针，指向一个函数用于枚举当前节点的属性。
    Get是一个函数指针，得到当前节点某一属性值。
     Set是一个函数指针，设置当前节点的某一属性数值。

下面我们来看看struct node* Player;

首先我们如下般获得Player：

context* p = Context();
player* myplayer = NULL;
if(p) Moonplayer = (player*)(p->Player);
然后我们就可以通过Moonplayer来进行播放的控制了。例如 Get可以获得播放的一些属性和状态，Set可以设定播放的属性和状态。

下表列出了Moonplayer控制的相关播放属性：(play.h)

// buffer size in KB (int)

#define PLAYER_BUFFER_SIZE 0x20

// microdrive buffer size in KB (int)

#define PLAYER_MD_BUFFER_SIZE 0x80

// microdrive mode (bool_t)

#define PLAYER_MICRODRIVE 0x21

// repeat (bool_t)

#define PLAYER_REPEAT 0x22

// shuffle (bool_t)

#define PLAYER_SHUFFLE 0x23

// start play after open (bool_t)

#define PLAYER_PLAYATOPEN 0x24

// start play after open in fullscreen (bool_t)

#define PLAYER_PLAYATOPEN_FULL 0x7B

// exit at the end (bool_t)

#define PLAYER_EXIT_AT_END 0xB9

// keep playlist after WND set null (bool_t)

#define PLAYER_KEEPLIST 0x48

// play or pause (bool_t)

#define PLAYER_PLAY 0x32

// play speed (fraction)

#define PLAYER_PLAY_SPEED 0x3F

// fastforward (bool_t)

#define PLAYER_FFWD 0x49

// fastforward speed (fraction)

#define PLAYER_FFWD_SPEED 0x4A

// position in fraction (fraction)

#define PLAYER_PERCENT 0x25

// position in time (tick_t)

#define PLAYER_POSITION 0x28

// duration (tick_t)

#define PLAYER_DURATION 0x46

// timer shown on screen (tchar_t[])

#define PLAYER_TIMER 0x7E

// show left time (bool_t)

#define PLAYER_TIMER_LEFT 0x7F

// benchmark duration (tick_t)

#define PLAYER_BENCHMARK 0x55

// benchmark video source size (point)

#define PLAYER_BENCHMARK_SRC 0xB6

// benchmark video dest size (point)

#define PLAYER_BENCHMARK_DST 0xB7

// display name (tchar_t[])

#define PLAYER_TITLE 0x29

// current format (format*)

#define PLAYER_FORMAT 0x2B

// current stream (stream*)

#define PLAYER_INPUT 0x2A

// current audio stream (int)

#define PLAYER_VSTREAM 0x76

// current video stream (int)

#define PLAYER_ASTREAM 0x77

// current subtitle stream (int)

#define PLAYER_SUBSTREAM 0x82

// current audio output class (int)

#define PLAYER_AOUTPUTID 0x83

// current video output class (int)

#define PLAYER_VOUTPUTID 0x84

// highest priorty audio output class (readonly int)

#define PLAYER_AOUTPUTID_MAX 0xA0

// highest priorty video output class (readonly int)

#define PLAYER_VOUTPUTID_MAX 0xA1

// current audio output (node*)

#define PLAYER_AOUTPUT 0x2C

// current video output (node*)

#define PLAYER_VOUTPUT 0x2D

// number of files in playlist (int)

#define PLAYER_LIST_COUNT 0x2E

// current file in playlist (int)

#define PLAYER_LIST_CURRENT 0x2F

// current file index (suffled) in playlist (int)

#define PLAYER_LIST_CURRIDX 0xA2

// fullscreen zoom factor (fraction_t)

#define PLAYER_FULL_ZOOM 0x35

// skin mode zoom factor (fraction_t)

#define PLAYER_SKIN_ZOOM 0x36

// bilinear zoom (bool_t)

#define PLAYER_SMOOTH50 0x47

// bilinear zoom (bool_t)

#define PLAYER_SMOOTHALWAYS 0x7A

// fullscreen direction flags (int)

#define PLAYER_FULL_DIR 0x39

// non fullscreen direction flags (int)

#define PLAYER_SKIN_DIR 0x45

// current relative dir (readonly) (int)

#define PLAYER_REL_DIR 0x7D

// overlay is on top or clipping needed (bool_t)

#define PLAYER_CLIPPING 0x3B

// skin viewport rectangle (rect)

#define PLAYER_SKIN_VIEWPORT 0x3C

// prerotate portrait movies

#define PLAYER_AUTOPREROTATE 0x3D

// fullscreen mode (bool_t)

#define PLAYER_FULLSCREEN 0x3E

// volume volume (int 0..100)

#define PLAYER_VOLUME 0x40

// volume mute (bool_t)

#define PLAYER_MUTE 0x41

// panning (int -128..128)

#define PLAYER_PAN 0x9D

// preamp (int -128..128)

#define PLAYER_PREAMP 0x9E

// audio quality (int 0..2)

#define PLAYER_AUDIO_QUALITY 0x42

// auto video quality (int 0..2)

#define PLAYER_VIDEO_QUALITY 0xBC

// video idct acceleration (bool_t)

#define PLAYER_VIDEO_ACCEL 0x44

// keep audio playing in background

#define PLAYER_KEEPPLAY_AUDIO 0x63

// keep video playing in background

#define PLAYER_KEEPPLAY_VIDEO 0x72

#define PLAYER_SHOWINBACKGROUND 0xBF

#define PLAYER_SINGLECLICKFULLSCREEN 0xC0

// microdrive start at in KB (int)

#define PLAYER_BURSTSTART 0xA3

// how much to load (%)

#define PLAYER_UNDERRUN 0x67

// how much to load for audio (int)

#define PLAYER_AUDIO_UNDERRUN 0xBB

// move back step time (tick_t)

#define PLAYER_MOVEBACK_STEP 0x68

// move ffwd step time (tick_t)

#define PLAYER_MOVEFFWD_STEP 0x7C

// stereo enum (int)

#define PLAYER_STEREO 0x74

// aspect ratio (frac)

#define PLAYER_ASPECT 0xBE

// application sent to background (bool_t)

#define PLAYER_BACKGROUND 0x98

// player window is foreground (bool_t)

#define PLAYER_FOREGROUND 0xB4

// set before and after sleep (bool_t)

#define PLAYER_POWEROFF 0xB5

// video caps

#define PLAYER_VIDEO_CAPS 0x64

// discard saved playlist (bool)

#define PLAYER_DISCARDLIST 0xBA

// video output is a real overlay, readonly (bool_t)

#define PLAYER_VIDEO_OVERLAY 0xBD

// player status

#define PLAYER_SYNCING 0x81

#define PLAYER_LOADMODE 0x96

#define PLAYER_STREAMING 0xB8

// notify pin for interface

#define PLAYER_NOTIFY 0x97

// on list changed event

#define PLAYER_LIST_NOTIFY 0x78

// for open dialog

#define PLAYER_CURRENTDIR 0x6D

// commands:

// update video settings

#define PLAYER_UPDATEVIDEO 0x90

// update equalizer settings

#define PLAYER_UPDATEEQUALIZER 0xA5

// begin screen rotation (turn off video)

#define PLAYER_ROTATEBEGIN 0x91

// end screen rotation

#define PLAYER_ROTATEEND 0x92

// reset video driver

#define PLAYER_RESETVIDEO 0x93

// codec notify about not supported data (pin)

#define PLAYER_NOT_SUPPORTED_DATA 0x9F

// move back

#define PLAYER_MOVEBACK 0x9A

// move forward

#define PLAYER_MOVEFFWD 0x9B

// position bar moving state (boolean)

#define PLAYER_INSEEK 0x9C

// next chapter/track

#define PLAYER_NEXT 0xB0

// prev chapter/track

#define PLAYER_PREV 0xB1

// stop

#define PLAYER_STOP 0xB2

// resync

#define PLAYER_RESYNC 0xB3

// array type params (just a hint)

#define PLAYER_ARRAY 0x1000

// url in playlist (0x1000,0x1001,0x1002...)

#define PLAYER_LIST_URL 0x1000

// title in playlist (0x2000,0x2001,0x2002...)

#define PLAYER_LIST_TITLE 0x2000

// title or filename in playlist

#define PLAYER_LIST_AUTOTITLE 0x5000

// length in playlist (0x4000,0x4001,0x4002...)

#define PLAYER_LIST_LENGTH 0x4000

// input comments

#define PLAYER_COMMENT 0x3000

举个例子：

播放的的话，我们可以如下设置：

Bool_t b=1;

Moonplayer->Set(Moonplayer,PLAYER_PLAYER,&b,sizeof(b));

停止的话，可以是：

Bool_t b=0;

Moonplayer->Set(Moonplayer,PLAYER_PLAYER,&b,sizeof(b));

其他播放类似，可以参考TCPMP或者我程序中的代码。

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WINCE TCPMP应用三:TCPMP的播放模块

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