QCC308x headset 做同时双向输出音频
/******************************************************************************
Copyright (c) 2014 - 2015 Qualcomm Technologies International, Ltd.
FILE NAME
audio_output.h
DESCRIPTION
Plugin that implements multichannel audio by utilising multiple hardware
audio outputs (onboard DAC, I2S, etc...).
*/
/*!
@file audio_output.h
@brief Implements multichannel audio by utilising multiple hardware audio
outputs (onboard DAC, I2S, etc...).
This file provides documentation for the audio_output API.
Plugin should be initialised with a suitable output mapping before
being used, defined by the structures declared in this header file.
*/
#ifndef __AUDIO_OUTPUT_H__
#define __AUDIO_OUTPUT_H__
/*============================================================================*
* SDK Header Files
*============================================================================*/
#include <csrtypes.h>
#include <stream.h>
/*============================================================================*
* Public Defintions
*============================================================================*/
/* Turn audio output into a bitmask */
#define AudioOutputGetMask(audio_out) ((uint16)1 << audio_out)
/*============================================================================*
* Public Data Types
*============================================================================*/
/*!
@brief Audio Output Channel
Allows identification of and looping through each output channel. The first
output should always start at 0, and audio_output_max should always be last
as it is also used to define arrays and loop bounds.
*/
typedef enum __audio_output
{
audio_output_primary_left = 0, /*! Left primary (filtered) output */
audio_output_primary_right, /*! Right primary (filtered) output */
audio_output_secondary_left, /*! Left secondary (filtered) output */
audio_output_secondary_right, /*! Right secondary (filtered) output */
audio_output_wired_sub, /*! Wired subwoofer (LP filter) output */
audio_output_aux_left, /*! Left auxiliary (full range) output */
audio_output_aux_right, /*! Right auxi