62 lines
1.4 KiB
C
62 lines
1.4 KiB
C
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/*
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* Copyright (C) 2013 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 __LOOPBACK_DEVICE_H__
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#define __LOOPBACK_DEVICE_H__
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#include "iop_au_interface.h"
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typedef void * loopback_device_t;
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/*
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* loopback_device_t is an object that handles looping device rx to device tx
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*/
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typedef enum {
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kI2S_0 = 0,
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kI2S_1,
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kI2S_2,
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kI2S_3,
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kMCA_0,
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kMCA_1,
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kAudioDevice_Last
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} AudioDevice_Index;
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// create a loopback_device that will read from device rx, optional process, and send to device tx
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loopback_device_t create_loopback_device(AudioDevice_Index device, audio_unit_t optional_au, size_t bytes_per_frame);
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void destroy_loopback_device(loopback_device_t device);
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typedef enum {
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kFrameError = 0,
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kRXOverrun,
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kRXUnderrun,
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kTXOverrun,
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kTXUnderrun,
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kError_last
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} Error_Index;
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static const char* const kErrorTypeStr[kError_last] = {
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"Frame_Error",
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"RX_Overrun",
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"RX_Underrun",
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"TX_Overrun",
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"TX_Underrun",
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};
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uint32_t getErrorCount(loopback_device_t device, Error_Index which);
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// return true on success
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bool start_loopback_device(loopback_device_t device);
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bool stop_loopback_device(loopback_device_t device);
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#endif /* __LOOPBACK_DEVICE_H__ */
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