• Win32 Multimedia Programmer's Reference • WinAPI Reference

	Overview

	Group

	Quick Info

The quality command defines a custom quality level for either audio, video or still image data compression. Digital-video devices recognize this command.

wsprintf(lpstrCommand, "quality %s %s %s", lpszDeviceID, lpszQuality,
lpszFlags);

Parameters
lpszDeviceID
Identifier of an MCI device. This identifier or alias is assigned when the device is opened.

lpszQuality
One or more of the following flags. (One of the three flags "audio", "still", and "video" must be present.)

algorithm algorithm	Associates the quality level with the specified algorithm. This algorithm must be supported by the device and be compatible with the "audio", "still", or "video" flag that is used. If omitted, the current algorithm is used.
audio name	Indicates this command specifies an "audio" quality level identified with name.
dialog	Requests that the device display a dialog box. This dialog box has algorithm-specific fields that are used internally by the device to create the structure describing a specific quality level.
handle handle	Specifies a handle to a structure that contains algorithmic-specific data describing a specific quality level. The structures for the data referenced by this handle are device specific.
still name	Indicates the command specifies a "still" quality level identified with name.
ideo name	Indicates the command specifies a "video" quality level identified with name.

lpszFlags

Can be "wait", "notify", "test", or a combination of these. For more information about these flags, see The Wait, Notify, and Test Flags.

Return Values
Returns zero if successful or an error otherwise.

Remarks
This command defines a string name for the quality level, which can then be used in a setvideo "quality", setvideo "still quality", or setaudio "quality" command to establish it as the current video, still, or audio-compression quality level.