The application programming model for an OS/2 multimedia application is an extension of the OS/2 Presentation Manager programming model, providing both messaging and procedural programming interfaces. OS/2 multimedia API procedures allow applications to manage data and control devices while messages from the OS/2 multimedia system notify applications of asynchronous events.
The media control interface provides a view of the OS/2 multimedia system to both application developers and users that is similar to that of a video and audio home entertainment system. Operations are performed by controlling the processors of media information, known as media devices. Media devices can be internal or external hardware devices, or they can be software libraries that perform a defined set of operations by manipulating lower-level hardware components and system software functions.
Multiple media devices can be used in an operation. For example, the playback of an audio compact disc can be implemented by coordinating the control of a compact disc player and an amplifier-mixer device.
The Media Device Manager (MDM) shown in the following figure provides resource management for media devices and enables the command message and command string interface. The Media Device Manager provides device independence to an application developer.
旼컴컴컴컴컴� 旼컴컴컴컴컴� 旼컴컴컴컴컴� 旼컴컴컴컴컴� 旼컴컴컴컴컴� 旼컴컴컴컴컴� 旼컴컴컴컴컴�
� Data � � � � Media � � � � Volume � � CD � � Digital �
쿎onverter � � Install � � Players � � Setup � � Control � � Player � � Audio �
읓컴컴컴컴컴� 읕컴컴쩡컴컴� 읕컴컴쩡컴컴� 읕컴컴쩡컴컴� 읕컴컴쩡컴컴� 읕컴컴쩡컴컴� 읕쩡컴컴컴컴�
� � � � � � � Applications
-�- - - - - - - - - � - - - - - - � - - - - - - � - - - - - - � - - - - - - � - - - - � - - - - - - - - - - -
� 旼컴컴컴컴컴컴좔컴컴컴컴컴컴좔컴컴컴컴컴컴좔컴컴컴컴컴컴좔컴컴컴컴컴컴좔컴컴컴컴좔컴컴컴컴컴컴컴컴컴컴�
� � Media Device Manager Interface Layer �
� 읕컴컴컫컴컴컴컴컴컴컴쩡컴컴컴컴컴컴컫컴컴컴컴컴컴컴쩡컴컴컴컴컴컴컫컴컴컴컴컴컴컴쩡컴컴컴컴컴컴컫컴컴�
� � � � � � � �
� 旼컴컴좔컴컴커 旼컴컴좔컴컴커 旼컴컴좔컴컴커 旼컴컴좔컴컴커 旼컴컴좔컴컴커 旼컴컴좔컴컴커 旼컴컴좔컴컴커
� � CD-ROM/XA � � CD Audio � 쿥ave Audio � � Sequencer � 쿏igitalvideo� � Amp/Mixer � � Videodisc �
� � Driver � � Driver � � Driver � � Driver � � Driver � � Driver � � Driver �
� 읕컴컴컴컴쩟켸 읕쩡컴컴컫컴켸 읕컴컴컴컫컴켸 읕컴컫컴컴컴켸 읕컴쩡컴컴컴켸 읓컫컴컴컴컴켸 읕컴컴쩡컴컴켸
� Application 납 � � 읕컴컴컴커 � � � � �
� or 납 � 읕컴컴컴컴컴컴컴컴컴컴� � � 旼컴컴컴컴컴� � � �
� Media Driver 냅컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴� � � � � 旼컴컴컴컴컴컴컴컴컴컴� 읕컴컴컴� �
� � 旼� � � � � � � � �
憫컴컴컴컴� � � Stream Handlers � � � � � � 旼컴좔컴커 �
� MMIO 쳐컴� � � 旼컴컴컴컴컴컴커 � � � � � � 旼컴컴컴컴컴컴커 � Audio � �
� Manager � � � 넬캑 File System � � � � � � � 旼� Audio 쳐컴컴� VSD � �
읕컴컫컴컴� 읕컵컴컴킴 읕컴컴컴컴컴컴켸 � � � � � � � 읕컴컴컴컴컴컴켸 � � �
旼컴컨컴컴컴컴커 � 납 旼컴컴컴컴컴컴커 � � � � � � � 旼컴컴컴컴컴컴커 읕컴쩡컴켸 �
쿔/O Procedures� � 납 � Multi-track 쳐� 旼컴컨컨컨컨컨컨� 쳐� Memory � � �
읕컴컫컴컴컴컴켸 � 납 읕컴컴컴컴컴컴켸 � 넬컴컴컴컴컴컴커� � 읕컴컴컴컴컴컴켸 � �
� � 납 旼컴컴컴컴컴컴커 쳐컴킴 Sync/Stream 납 � 旼컴컴컴컴컴컴커 � �
� � 냅캑 Video 쳐� 납 Manager DLL 쳔컴컵캑 CD-ROM/XA � � �
� 읕컴엿 읕컴컴컴컴컴컴켸 � 냅컴컴컴쩡컴컴켸� � 읕컴컴컴컴컴컴켸 � �
� 납 旼컴컴컴컴컴컴커 � � � � � 旼컴컴컴컴컴컴커 � �
旼컨컴컴컴컴� 납 � MIDI Mapper 쳐� � � � 읕� CD/DA � � � RING 3
쿑ile System� 납 읕컴컴컴컴컴컴켸 � � � 읕컴컴컴컴컴컴켸 � � DLL
- -�- - - - - -�- - - 납- - - - - - - - - - - -�- - - -�- - - -�- - - - - - - - - - - - - - - � - - - - �- - - - -
쿑AT/HPFS/XA� 납 넬컴컴컴좔컴컴커� � � RING 0
읕쩡컴컫컴쩟� 납 납 Sync/Stream 납 � � PDD
� � 냅컴컴컴엿� 납 Manager PDD 납 � �
旼컴좔컴엿旼좔컴컴� 납� 냅컴컴컴컴컴컴켸� � IOCtl �
� Hard 납� R/W � 납� 읕컴컴컴쩡컴컴컴� � �
� Disk 납쿚ptical� 납� � � �
� PDD 납� PDD � 납� � � � IOCtl
읕쩡컴컴冒읕쩡컴컴� 납� � � �
� � � 납� 旼컴좔컴컴컴컴컴컴컴컴컴컴� � �
� � 읏 납� 旼컴큃ing 0 Stub Device Driver쳐컴컴컴컴컴컴컴캑 �
� � � 납� � 읕컴컴컴컴컴쩡컴컴컴컴컴컴� � �
넬컴컴컨컴엿 旼컴좋좔컴� � 旼컴컴컴컴컴탠컴컴컴컴컴커 � �
납Diskette납 쿎D-ROM/XA� IDC � 넬컴컴컴컴컴좔컴컴컴컴컴엿 � �
납 PDD 납 � PDD � � 납Common Audio Interface쳔컴컴컴컴컴컴컴컴켸 �
냅컫컴컴컴冒 읕컴쩡컴컴� � 냅컴컴컴컴컴쩡컴컴컴컴컴冒 �
� � � 旼좔컴컴컴컴커 � � 旼컴컴좔컴컴� � 旼컴좔컴�
� � � 쿒eneric SCSC� � � � OEM Audio � � � OS/2 �
� � 읕컴캑 DD � 읕컴탠컴컴� Device � � � COM �
� � 읕컴컴쩡컴컴켸 � � Driver � � � PDD �
� � � � 읕컴컴쩡컴컴� � 읕컴쩡컴�
� � � 읕컴컴컴컴컴탠컴컴컴컴컴켸 �
- -�- � - - - - - - - - -�- - - - - - - - - - - - - - - - - - -�- - - - - - - - - - - - - - - - - - - - �- - - -
� 읕컴컴컴커 쳐컴컴컴컴� � �
� � � � 旼컴좔컴컴� RS-232
Hard Diskette Optical CD-ROM 쿚EM Audio�
Drive Drive Drive Drive 읕컴컴커 � Physical
읕켸 Devices
Refer to the OS/2 Multimedia Subsystem Programming Guide for information on multimedia subsystem programming including media drivers and stream handlers.
To assist you in creating a standardized user interface for your OS/2 multimedia
application, OS/2 provides multimedia window controls, which have been implemented
in OS/2 multimedia applications such as Volume Control. See the
following figure.
Graphic buttons are two-state buttons that can be toggled up and down. They can display text, or graphics, or both. They can also be animated. Their versatility makes graphic buttons ideal to use for device control panels.
Circular sliders lend realism to your panel by providing familiar-looking dials. The dials are easy to operate and do not hog screen real estate.
Secondary windows provide a sizeable dialog window to contain your multimedia device controls.