39 lines
1.2 KiB
C
39 lines
1.2 KiB
C
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/*
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* Copyright (C) 2010-2011 Apple Inc. All rights reserved.
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*
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* This document is the property of Apple Inc.
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* It is considered confidential and proprietary.
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*
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* This document may not be reproduced or transmitted in any form,
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* in whole or in part, without the express written permission of
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* Apple Inc.
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*/
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#ifndef _DEBUG_TAP_H_
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#define _DEBUG_TAP_H_
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#include <platform.h>
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/*
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* A debug_tap is a way of tapping off or tapping in an audio signal from
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* user space. Pass the pointer to the beginning, end, and start to create
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* a tap. You send or get data from a tap, which causes the write or read
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* head to progress around the buffer circularly. When the process wraps,
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* the send or get call returns the total number of bytes sent, otherwise
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* it returns 0.
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*/
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typedef void * debug_tap_t;
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debug_tap_t create_debug_tap(uint8_t *inIOBegin, uint8_t *inIOEnd, uint8_t *inIO);
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void destroy_debug_tap(debug_tap_t tap);
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// return value is nonzero on calls where we wrap IO buffer. Returned
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// value indicates number bytes to give to "timestamp" function
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size_t send_to_tap(debug_tap_t tap, const uint8_t* src, uint32_t sizeInBytes);
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size_t get_from_tap(debug_tap_t tap, uint8_t* dst, uint32_t sizeInBytes);
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#endif // _DEBUG_TAP_H_
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