From Wikipedia, the free encyclopedia. In fact, because multimedia programmers often have to support both digital audio and MIDI in their programs, Windows tries to make things even simpler by having you pass your instructions ie, commands to the MCI Wave Device in the same way and using the same API function as you pass instructions to the MCI Sequencer Device. Other MCI devices have also been made available over time. The procedure first opens the waveaudio device by issuing an open command. Views Read Edit View history. The close command is used to tell the Media Control Interface that you are done with the microphone. MCI makes it very simple to write a program which can play a wide variety of media files and even to record sound by just passing commands as strings.
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Media Control Interface – Wikipedia
Passing strings to an MCI device is referred to as using the “Command string interface”. And there are other cases where you wavveform find it easier yourself to use strings, or easier to use binary values.
You need give them only some general instructions to follow, and one such command for both of them could indeed be to “start playback”. For example, let’s take that same job of telling the MCI Wave Device to set itself up for recording a KHz sample rate, stereo, 8-bit waveform.
Record a Waveform File. Indeed, many of the documented commands are the same for both. Record a Waveform File. It uses relations described in Windows registries or in the [MCI] section of the file system.
The close command is used to tell the Media Control Interface that you are done with the microphone.
Playing a Waveform File. The Wave Audio and Sequencer Devices are referred to as compound devices.
It is not necessary to specify an end time for the play command. Views Read Edit View history. The new flag tells MCI wavefrom the waveaudio device should be opened for recording, not playback.
These commands are subdivided into categories:.
Example: Playing a Waveform File
You can help Wikipedia by expanding it. So too with opening multiple instances of the Wave Audio or Sequencer Devices.
The procedure first opens the waveaudio device by issuing an open command. In the other approach, you instead pass null-terminated strings.
Playing a Waveform-Audio File
The alias parameter is required when using the new flag. MCI makes it very simple to write a program which can play a wide variety of media files and even to record sound by just passing commands as strings. After you’re done using the device and have no further use wavefoem ityou must close that device.
In this case, it gives the recording session the name “mysong” so that future instructions can refer to it. We use the alias parameter so that we can refer to this media entity as ding instead of always using the full path to ding.
Media Control Interface
From Wikipedia, the free encyclopedia. After opening the device, you can then issue commands directly to it using mciSendString or mciSendCommand.
And then cmi call a function that passes this structure to the MCI Wave Wavfeorm, as well as passing a “Command” value that indicates to the MCI Wave Device that it should expect this structure, and to use those values to set its record parameters. To play a type of media, it needs to be initialized correctly using MCI commands. Furthermore, when you use mciSendCommand to command the MCI Sequencer or Wave Audio Device to return some information to you, for example if you ask it to tell you what bit resolution and sample rate is currently set for recordingthen these devices will fill in structures with binary values.
The WAIT instruction just waits for two seconds. Furthermore, one of the goals of the High level API is to allow the playback or recording to be done by the operating system in the background while your program goes on to do other things.
For example it may return a string that looks like “bitspersample 8 channels 1 samplespersec “.