File content as of revision 0:3eee9435dd17:

/**
******************************************************************************
* @file    /Src/audio_if.c
* @author  Central Labs
* @version V1.0.0
* @date    7-May-2015
* @brief   USB Device Audio interface file.
******************************************************************************
@attention
*
* <h2><center>&copy; COPYRIGHT(c) 2014 STMicroelectronics</center></h2>
*
* Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
* You may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
*        http://www.st.com/software_license_agreement_liberty_v2
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*   1. Redistributions of source code must retain the above copyright notice,
*      this list of conditions and the following disclaimer.
*   2. Redistributions in binary form must reproduce the above copyright notice,
*      this list of conditions and the following disclaimer in the documentation
*      and/or other materials provided with the distribution.
*   3. Neither the name of STMicroelectronics nor the names of its contributors
*      may be used to endorse or promote products derived from this software
*      without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
******************************************************************************
*/

/* Includes ------------------------------------------------------------------*/
#include "audio_if.h"

//uint16_t PDM_Buffer[AUDIO_CHANNELS*AUDIO_SAMPLING_FREQUENCY/1000*64/8];
//static uint16_t PCM_Buffer[AUDIO_CHANNELS*AUDIO_SAMPLING_FREQUENCY/1000];

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private variables ---------------------------------------------------------*/


/* Private functions ---------------------------------------------------------*/
/* This table maps the audio device class setting in 1/256 dB to a
* linear 0-64 scaling used in pdm_filter.c. It is computed as
* 256*20*log10(index/64). */
//const int16_t vol_table[65] =
//{ 0x8000, 0xDBE0, 0xE1E6, 0xE56B, 0xE7EB, 0xE9DB, 0xEB70, 0xECC7,
//0xEDF0, 0xEEF6, 0xEFE0, 0xF0B4, 0xF176, 0xF228, 0xF2CD, 0xF366,
//0xF3F5, 0xF47C, 0xF4FB, 0xF574, 0xF5E6, 0xF652, 0xF6BA, 0xF71C,
//0xF778, 0xF7D6, 0xF82D, 0xF881, 0xF8D2, 0xF920, 0xF96B, 0xF9B4,
//0xF9FB, 0xFA3F, 0xFA82, 0xFAC2, 0xFB01, 0xFB3E, 0xFB79, 0xFBB3,
//0xFBEB, 0xFC22, 0xFC57, 0xFC8C, 0xFCBF, 0xFCF1, 0xFD22, 0xFD51,
//0xFD80, 0xFDAE, 0xFDDB, 0xFE07, 0xFE32, 0xFE5D, 0xFE86, 0xFEAF,
//0xFED7, 0xFF00, 0xFF25, 0xFF4B, 0xFF70, 0xFF95, 0xFFB9, 0xFFD0,
//0x0000 };

//volatile uint8_t VolumeSetting=64;

/**
* @brief  Initializes the AUDIO media low layer.
* @param  AudioFreq: Audio frequency used to play the audio stream.
* @param  BitRes: desired bit resolution
* @param  ChnlNbr: number of channel to be configured
* @retval AUDIO_OK in case of success, AUDIO_ERROR otherwise
*/
int8_t Audio_Init(void)
{
    return BSP_AUDIO_IN_Init(48000, 16, 1);
}



/**
* @brief  Start audio recording engine
* @retval AUDIO_OK in case of success, AUDIO_ERROR otherwise
*/
int8_t Audio_Record(uint16_t * recbuff)
{
	int8_t res = BSP_AUDIO_IN_Record(recbuff, 2048);
//	AudioProcess(pbuf, recbuff);
	return res;
}

/**
* @brief  Controls AUDIO Volume.             
* @param  vol: Volume level
* @retval AUDIO_OK in case of success, AUDIO_ERROR otherwise
*/
//int8_t Audio_VolumeCtl(int16_t Volume)
//{
//  /* Call low layer volume setting function */
//  int j;
//  
//  j = 0;
//  /* Find the setting nearest to the desired setting */
//  while(j<64 &&
//        abs(Volume-vol_table[j]) > abs(Volume-vol_table[j+1])) {
//          j++;
//        }
//  /* Now do the volume adjustment */
//  VolumeSetting = (uint8_t)j; 
//  return BSP_AUDIO_IN_SetVolume(VolumeSetting);
//
//  
//}

/**
* @brief  Controls AUDIO Mute.              
* @param  cmd: Command opcode
* @retval AUDIO_OK in case of success, AUDIO_ERROR otherwise
*/
//int8_t Audio_MuteCtl(uint8_t cmd)
//{
//  return AUDIO_OK;
//}


/**
* @brief  Stops audio acquisition
* @param  none
* @retval AUDIO_OK in case of success, AUDIO_ERROR otherwise
*/
int8_t Audio_Stop(void)
{  
	return BSP_AUDIO_IN_Stop();

}

/**
* @brief  Pauses audio acquisition
* @param  none
* @retval AUDIO_OK in case of success, AUDIO_ERROR otherwise
*/
//
//int8_t Audio_Pause(void)
//{
//  return 0;
//}


/**
* @brief  Resumes audio acquisition
* @param  none
* @retval AUDIO_OK in case of success, AUDIO_ERROR otherwise
*/
//int8_t Audio_Resume(void)
//{  
//  return AUDIO_OK;
//}

/**
* @brief  Manages command from usb
* @param  None
* @retval AUDIO_OK in case of success, AUDIO_ERROR otherwise
*/
//
//int8_t Audio_CommandMgr(uint8_t cmd)
//{
//  return AUDIO_OK;
//}
//
//void AudioProcess(uint16_t * pbuf, uint16_t * recbuff)
//{
//  BSP_AUDIO_IN_PDMToPCM(pbuf,recbuff);
//  // need to copy recbuff to final output buff (in chunks)
//}





/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/