DVD_MUA_MixingInfo structure (strmif.h)
[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
The DVD_MUA_MixingInfo structure describes the surround sound mixing information for the channels in one audio stream in a specified title.
Syntax
typedef struct tagDVD_MUA_MixingInfo {
BOOL fMixTo0;
BOOL fMixTo1;
BOOL fMix0InPhase;
BOOL fMix1InPhase;
DWORD dwSpeakerPosition;
} DVD_MUA_MixingInfo;
Members
fMixTo0
Variable of type BOOL; TRUE means the channel is mixed to channel 0.
fMixTo1
Variable of type BOOL; TRUE means the channel is mixed to channel 1.
fMix0InPhase
Variable of type BOOL; TRUE means the channel is mixed in phase to channel 0.
fMix1InPhase
Variable of type BOOL; TRUE means the channel is mixed in phase to channel 1.
dwSpeakerPosition
The speaker for which this channel is intended. See Remarks.
Remarks
Applications cannot use the information contained in this structure to change the mixing unless they have a way to communicate with a custom audio decoder that has been inserted manually into the filter graph. The default audio decoder handles Linear Pulse Code Modulated (LPCM) audio using the mixing information on the digital video disc (DVD), but applications have no way to instruct the decoder to modify the mixing values. This means that current DVD playback applications should have no need to access the multichannel-related data structures.
The DVD_MultichannelAudioAttributes structure contains information about one audio stream in a specified title. An array of up to eight DVD_MUA_MixingInfo structures will be populated in this structure, if the following conditions are true.
- DVD_AudioAttributes.AppMode = DVD_AudioMode_Surround
- DVD_AudioAttributes.AudioFormat = DVD_AudioFormat_LPCM
- DVD_AudioAttributes.fHasMultichannelInfo = 1
| Define | Value |
|---|---|
| KSAUDIO_SPEAKER_LEFT | 0x1 |
| KSAUDIO_SPEAKER_RIGHT | 0x2 |
| KSAUDIO_SPEAKER_CENTER | 0x4 |
| KSAUDIO_SPEAKER_SURROUND_LEFT | 0x8 |
| KSAUDIO_SPEAKER_SURROUND_RIGHT | 0x10 |
| KSAUDIO_SPEAKER_SUBWOOFER | 0x20 |
| KSAUDIO_SPEAKER_LEFT_OF_CENTER | 0x40 |
| KSAUDIO_SPEAKER_RIGHT_OF_CENTER | 0x80 |
| KSAUDIO_SPEAKER_SURROUND_MONO | 0x100 |
| KSAUDIO_SPEAKER_SIDE_LEFT | 0x200 |
| KSAUDIO_SPEAKER_SIDE_RIGHT | 0x400 |
| KSAUDIO_SPEAKER_TOP | 0x800 |
Requirements
| Requirement | Value |
|---|---|
| Header | strmif.h (include Dshow.h) |