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unsigned int syncinterval; /* P for adaptive mode, 0 otherwise */
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unsigned int freqn; /* nominal sampling rate in fs/fps in Q16.16 format */
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unsigned int freqm; /* momentary sampling rate in fs/fps in Q16.16 format */
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unsigned int freqmax; /* maximum sampling rate, used for buffer management */
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unsigned int phase; /* phase accumulator */
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unsigned int maxpacksize; /* max packet size in bytes */
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unsigned int maxframesize; /* max packet size in frames */
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unsigned int curpacksize; /* current packet size in bytes (for capture) */
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unsigned int curframesize; /* current packet size in frames (for capture) */
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unsigned int fill_max: 1; /* fill max packet size always */
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unsigned int txfr_quirk:1; /* allow sub-frame alignment */
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unsigned int fmt_type; /* USB audio format type (1-3) */