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/**
******************************************************************************
* @file USB_Host/DynamicSwitch_Standalone/Src/audio.c
* @author MCD Application Team
* @brief This file provides the Audio Out (playback) interface API
******************************************************************************
* @attention
*
* Copyright (c) 2017 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/* Private define ------------------------------------------------------------*/
#define AUDIO_BLOCK_SIZE 512
#define AUDIO_BLOCK_NBR 33
/* Private macro -------------------------------------------------------------*/
/* Private typedef -----------------------------------------------------------*/
typedef struct {
uint8_t buff[AUDIO_BLOCK_SIZE * AUDIO_BLOCK_NBR];
int32_t out_ptr;
uint32_t in_ptr;
}Audio_BufferTypeDef;
/* Private variables ---------------------------------------------------------*/
static WAV_InfoTypedef wav_info;
static FIL wav_file;
static Audio_BufferTypeDef buffer_ctl;
static int16_t file_pos = 0;
/* Private function prototypes -----------------------------------------------*/
static AUDIO_ErrorTypeDef AUDIO_GetFileInfo(uint16_t file_idx, WAV_InfoTypedef *info);
/* Private functions ---------------------------------------------------------*/
/**
* @brief Starts Audio streaming.
* @param idx: File index
* @retval Audio error
*/
AUDIO_ErrorTypeDef AUDIO_Start(uint8_t idx)
{
uint32_t bytesread;
if((FileList.ptr > idx) && (BSP_SD_IsDetected()))
{
f_close(&wav_file);
AUDIO_GetFileInfo(idx, &wav_info);
audio_state = AUDIO_STATE_CONFIG;
/* Set Frequency */
USBH_AUDIO_SetFrequency(&hUSBHost,
wav_info.SampleRate,
wav_info.NbrChannels,
wav_info.BitPerSample);
/* Fill whole buffer at first time */
if(f_read(&wav_file,
&buffer_ctl.buff[0],
AUDIO_BLOCK_SIZE * AUDIO_BLOCK_NBR,
(void *)&bytesread) == FR_OK)
{
if(bytesread != 0)
{
return AUDIO_ERROR_NONE;
}
}
buffer_ctl.in_ptr = 0;
}
return AUDIO_ERROR_IO;
}
/**
* @brief Manages Audio process.
* @param None
* @retval Audio error
*/
AUDIO_ErrorTypeDef AUDIO_Process(void)
{
int32_t diff;
uint32_t bytesread, elapsed_time;
static uint32_t prev_elapsed_time = 0xFFFFFFFF;
uint8_t str [20];
switch(audio_state)
{
case AUDIO_STATE_PLAY:
if((buffer_ctl.out_ptr = USBH_AUDIO_GetOutOffset(&hUSBHost)) < 0) /* End of file */
{
audio_state = AUDIO_STATE_NEXT;
}
else if(buffer_ctl.out_ptr >= (AUDIO_BLOCK_SIZE * AUDIO_BLOCK_NBR)) /* End of buffer */
{
USBH_AUDIO_ChangeOutBuffer(&hUSBHost, &buffer_ctl.buff[0]);
}
else
{
diff = buffer_ctl.out_ptr - buffer_ctl.in_ptr;
if(diff < 0)
{
diff = AUDIO_BLOCK_SIZE * AUDIO_BLOCK_NBR + diff;
}
if(diff >= (AUDIO_BLOCK_SIZE * AUDIO_BLOCK_NBR / 2))
{
buffer_ctl.in_ptr += AUDIO_BLOCK_SIZE;
if( buffer_ctl.in_ptr >= (AUDIO_BLOCK_SIZE * AUDIO_BLOCK_NBR))
{
buffer_ctl.in_ptr = 0;
}
if(f_read(&wav_file,
&buffer_ctl.buff[buffer_ctl.in_ptr],
AUDIO_BLOCK_SIZE,
(void *)&bytesread) != FR_OK)
{
return AUDIO_ERROR_IO;
}
}
}
/* Display elapsed time */
elapsed_time = wav_file.fptr / wav_info.ByteRate;
if(prev_elapsed_time != elapsed_time)
{
prev_elapsed_time = elapsed_time;
sprintf((char *)str, "[%02lu:%02lu]", elapsed_time /60, elapsed_time%60);
BSP_LCD_SetTextColor(LCD_COLOR_CYAN);
BSP_LCD_DisplayStringAt(263, LINE(8), str, LEFT_MODE);
BSP_LCD_SetTextColor(LCD_COLOR_WHITE);
}
break;
case AUDIO_STATE_NEXT:
if(++file_pos >= FileList.ptr)
{
file_pos = 0;
}
USBH_AUDIO_Stop(&hUSBHost);
AUDIO_Start(file_pos);
break;
case AUDIO_STATE_PREVIOUS:
if(--file_pos < 0)
{
file_pos = FileList.ptr - 1;
}
USBH_AUDIO_Stop(&hUSBHost);
AUDIO_Start(file_pos);
break;
case AUDIO_STATE_PAUSE:
BSP_LCD_DisplayStringAt(250, LINE(14), (uint8_t *)" [PAUSE]", LEFT_MODE);
USBH_AUDIO_Suspend(&hUSBHost);
audio_state = AUDIO_STATE_WAIT;
break;
case AUDIO_STATE_RESUME:
BSP_LCD_DisplayStringAt(250, LINE(14), (uint8_t *)" [PLAY ]", LEFT_MODE);
USBH_AUDIO_Resume(&hUSBHost);
audio_state = AUDIO_STATE_PLAY;
break;
case AUDIO_STATE_VOLUME_UP:
USBH_AUDIO_SetVolume(&hUSBHost, VOLUME_UP);
audio_state = AUDIO_STATE_PLAY;
break;
case AUDIO_STATE_VOLUME_DOWN:
USBH_AUDIO_SetVolume (&hUSBHost, VOLUME_DOWN);
audio_state = AUDIO_STATE_PLAY;
break;
case AUDIO_STATE_WAIT:
case AUDIO_STATE_CONFIG:
case AUDIO_STATE_IDLE:
case AUDIO_STATE_INIT:
default:
break;
}
return AUDIO_ERROR_NONE;
}
/**
* @brief Stops Audio streaming.
* @param None
* @retval Audio error
*/
AUDIO_ErrorTypeDef AUDIO_Stop(void)
{
audio_state = AUDIO_STATE_IDLE;
USBH_AUDIO_Stop(&hUSBHost);
file_pos = 0;
f_close(&wav_file);
return AUDIO_ERROR_NONE;
}
/**
* @brief Probes the play back joystick state.
* @param state: Joystick state
* @retval None
*/
void AUDIO_PlaybackProbeKey(JOYState_TypeDef state)
{
/* Handle File List Selection */
if(state == JOY_UP)
{
if(audio_state == AUDIO_STATE_PLAY)
{
audio_state = AUDIO_STATE_VOLUME_UP;
}
}
else if(state == JOY_DOWN)
{
if(audio_state == AUDIO_STATE_PLAY)
{
audio_state = AUDIO_STATE_VOLUME_DOWN;
}
}
else if(state == JOY_RIGHT)
{
audio_state = AUDIO_STATE_NEXT;
}
else if(state == JOY_LEFT)
{
audio_state = AUDIO_STATE_PREVIOUS;
}
else if(state == JOY_SEL)
{
audio_state = (audio_state == AUDIO_STATE_WAIT) ? AUDIO_STATE_RESUME : AUDIO_STATE_PAUSE;
}
}
/**
* @brief Gets the file info.
* @param file_idx: File index
* @param info: Pointer to WAV file info
* @retval Audio error
*/
static AUDIO_ErrorTypeDef AUDIO_GetFileInfo(uint16_t file_idx, WAV_InfoTypedef *info)
{
uint8_t str [FILEMGR_FILE_NAME_SIZE + 20];
uint32_t bytesread;
uint32_t duration;
if(f_open(&wav_file, (char *)FileList.file[file_idx].name, FA_OPEN_EXISTING | FA_READ) == FR_OK)
{
/* Fill the buffer to Send */
if(f_read(&wav_file, info, sizeof(WAV_InfoTypedef), (void *)&bytesread) == FR_OK)
{
BSP_LCD_SetTextColor(LCD_COLOR_WHITE);
sprintf((char *)str, "Playing file (%d/%d): %s",
file_idx + 1, FileList.ptr,
(char *)FileList.file[file_idx].name);
BSP_LCD_ClearStringLine(4);
BSP_LCD_DisplayStringAtLine(4 ,str);
BSP_LCD_SetTextColor(LCD_COLOR_CYAN);
sprintf((char *)str , "Sample rate : %lu Hz", info->SampleRate);
BSP_LCD_ClearStringLine(6);
BSP_LCD_DisplayStringAtLine(6 ,str);
sprintf((char *)str , "Channels number : %d", info->NbrChannels);
BSP_LCD_ClearStringLine(7);
BSP_LCD_DisplayStringAtLine(7 ,str);
duration = info->FileSize / info->ByteRate;
sprintf((char *)str , "File Size : %lu MB [%02lu:%02lu]", info->FileSize/1024/1024, duration/60, duration%60 );
BSP_LCD_ClearStringLine(8);
BSP_LCD_DisplayStringAtLine(8 ,str);
BSP_LCD_DisplayStringAt(263, LINE(8), (uint8_t *)"[00:00]", LEFT_MODE);
BSP_LCD_SetTextColor(LCD_COLOR_WHITE);
return AUDIO_ERROR_NONE;
}
f_close(&wav_file);
}
return AUDIO_ERROR_IO;
}
/**
* @brief Informs user that settings have been changed.
* @param phost: Host Handle
* @retval None
*/
void USBH_AUDIO_FrequencySet(USBH_HandleTypeDef *phost)
{
if(audio_state == AUDIO_STATE_CONFIG)
{
/* Start first read */
USBH_AUDIO_Play (&hUSBHost, &buffer_ctl.buff[0], wav_info.FileSize);
BSP_LCD_DisplayStringAt(250, LINE(14), (uint8_t *)" [PLAY ]", LEFT_MODE);
audio_state = AUDIO_STATE_PLAY;
}
}
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