39 lines
1.3 KiB
Plaintext
39 lines
1.3 KiB
Plaintext
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MFT_AudioDelay sample.
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Implements an audio delay effect as a Media Foundation transform (MFT).
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Demonstrates how to write an audio MFT.
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This MFT is a 1-input, 1-output transform with fixed streams. It
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accepts any PCM audio type. The input and output formats must be
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identical.
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The MFT maintains a circular buffer of the last N audio samples that
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were received as input. To produce the output data, each input sample
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is mixed with the next sample on the circular buffer. The percentage of
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each sample in the output is the "wet/dry" mix:
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output_sample = (1.0 - wet) * input_sample + wet * delay_sample
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where "wet" ranges [0..1]
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The length of the buffer determines the length of the delay. If the
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client drains the MFT, the MFT produces an "effect tail," which is
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the trailing end of the delay effect.
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The application can set the delay length and the wet/dry mix using the
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following attributes:
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- MF_AUDIODELAY_WET_DRY_MIX
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- MF_AUDIODELAY_DELAY_LENGTH
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This sample requires Windows Vista or later.
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THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
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ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
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THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
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PARTICULAR PURPOSE.
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Copyright (c) Microsoft Corporation. All rights reserved. |