2.2.2.3.1 Extended Wave Format Structure (WAVEFORMAT_EXTENSIBLE)
The Extended Wave Format Structure provides detailed audio format information. For more information, see [MSDN-WAVEFMTEXT].
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wValidBitsPerSample/wSamplesPerBlock |
dwChannelMask |
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SubFormat (16 bytes) |
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wValidBitsPerSample/wSamplesPerBlock (2 bytes): Depending on the format used, the 16–bit field before dwChannelMask can be interpreted as either wValidBitsPerSample or wSamplesPerBlock. wValidBitsPerSample is a 16-bit unsigned integer specifying how many bits are valid for each sample. This value MUST be less than or equal to the value of the wBitsPerSample field of the containing Open PDU. wSamplesPerBlock is a 16-bit unsigned integer specifying the number of samples contained in one compressed block of audio data. This value is used with compressed formats that have a fixed number of samples within each block. This value can be set to 0 if a variable number of samples is contained in each block of compressed audio data.
dwChannelMask (4 bytes): A 32-bit unsigned integer specifying from which audio channels to record. This field MUST be a bitwise OR of the following values.
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Speaker position
Flag bit
SPEAKER_FRONT_LEFT
0x00000001
SPEAKER_FRONT_RIGHT
0x00000002
SPEAKER_FRONT_CENTER
0x00000004
SPEAKER_LOW_FREQUENCY
0x00000008
SPEAKER_BACK_LEFT
0x00000010
SPEAKER_BACK_RIGHT
0x00000020
SPEAKER_FRONT_LEFT_OF_CENTER
0x00000040
SPEAKER_FRONT_RIGHT_OF_CENTER
0x00000080
SPEAKER_BACK_CENTER
0x00000100
SPEAKER_SIDE_LEFT
0x00000200
SPEAKER_SIDE_RIGHT
0x00000400
SPEAKER_TOP_CENTER
0x00000800
SPEAKER_TOP_FRONT_LEFT
0x00001000
SPEAKER_TOP_FRONT_CENTER
0x00002000
SPEAKER_TOP_FRONT_RIGHT
0x00004000
SPEAKER_TOP_BACK_LEFT
0x00008000
SPEAKER_TOP_BACK_CENTER
0x00010000
SPEAKER_TOP_BACK_RIGHT
0x00020000
SubFormat (16 bytes): A GUID that specifies the audio format to use for recording data. This field MUST be set to KSDATAFORMAT_SUBTYPE_PCM ({00000001-0000-0010-8000-00aa00389b71}).