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/**
******************************************************************************
* @file USB_Host/MTP_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_BUFFER_SIZE (16 * 512)
#define FILE_NAME_SIZE 255
/* Private macro ------------------------------------------------------------- */
/* Private typedef ----------------------------------------------------------- */
typedef enum
{
BUFFER_OFFSET_NONE = 0,
BUFFER_OFFSET_HALF,
BUFFER_OFFSET_FULL,
} BUFFER_StateTypeDef;
typedef struct
{
uint8_t buff[AUDIO_BUFFER_SIZE];
int32_t offset;
uint32_t fptr;
} Audio_BufferTypeDef;
/* Private variables --------------------------------------------------------- */
static WAV_InfoTypedef wav_info;
static Audio_BufferTypeDef buffer_ctl;
static int16_t file_pos = 0;
static __IO uint32_t uwVolume = 70;
/* Private function prototypes ----------------------------------------------- */
static AUDIO_ErrorTypeDef AUDIO_GetFileInfo(uint16_t file_idx,
WAV_InfoTypedef * info);
/* Private functions --------------------------------------------------------- */
/**
* @brief Initializes Audio Interface.
* @param None
* @retval Audio error
*/
AUDIO_ErrorTypeDef AUDIO_Init(void)
{
if (BSP_AUDIO_OUT_Init(OUTPUT_DEVICE_AUTO, uwVolume, I2S_AUDIOFREQ_44K) == 0)
{
BSP_AUDIO_OUT_SetAudioFrameSlot(CODEC_AUDIOFRAME_SLOT_02);
return AUDIO_ERROR_NONE;
}
return AUDIO_ERROR_IO;
}
/**
* @brief Starts Audio streaming.
* @param idx: File index
* @retval Audio error
*/
AUDIO_ErrorTypeDef AUDIO_Start(uint8_t idx)
{
uint32_t bytesread;
if (MTP_GetWavObjectNumber() > idx)
{
AUDIO_GetFileInfo(idx, &wav_info);
BSP_AUDIO_OUT_SetFrequency(wav_info.SampleRate);
buffer_ctl.offset = BUFFER_OFFSET_NONE;
if (MTP_GetData(idx,
44,
AUDIO_BUFFER_SIZE, &buffer_ctl.buff[0], &bytesread) == 0)
{
audio_state = AUDIO_STATE_PLAY;
BSP_LCD_DisplayStringAt(250, LINE(14), (uint8_t *)" [PLAY ]", LEFT_MODE);
{
if (bytesread != 0)
{
BSP_AUDIO_OUT_Play((uint16_t *) & buffer_ctl.buff[0], AUDIO_BUFFER_SIZE);
buffer_ctl.fptr = bytesread;
return AUDIO_ERROR_NONE;
}
}
}
}
return AUDIO_ERROR_IO;
}
/**
* @brief Manages Audio process.
* @param None
* @retval Audio error
*/
AUDIO_ErrorTypeDef AUDIO_Process(void)
{
uint32_t bytesread, elapsed_time;
static uint32_t prev_elapsed_time = 0xFFFFFFFF;
uint8_t str[14];
AUDIO_ErrorTypeDef error_state = AUDIO_ERROR_NONE;
switch (audio_state)
{
case AUDIO_STATE_PLAY:
if (buffer_ctl.fptr >= wav_info.FileSize)
{
error_state = AUDIO_ERROR_EOF;
}
if (buffer_ctl.offset == BUFFER_OFFSET_HALF)
{
if (MTP_GetData(file_pos,
buffer_ctl.fptr,
AUDIO_BUFFER_SIZE / 2,
&buffer_ctl.buff[0], &bytesread) > 0)
{
error_state = AUDIO_ERROR_IO;
}
buffer_ctl.offset = BUFFER_OFFSET_NONE;
buffer_ctl.fptr += bytesread;
}
if (buffer_ctl.offset == BUFFER_OFFSET_FULL)
{
if (MTP_GetData(file_pos,
buffer_ctl.fptr,
AUDIO_BUFFER_SIZE / 2,
&buffer_ctl.buff[AUDIO_BUFFER_SIZE / 2], &bytesread) > 0)
{
error_state = AUDIO_ERROR_IO;
}
buffer_ctl.offset = BUFFER_OFFSET_NONE;
buffer_ctl.fptr += bytesread;
}
/* Display elapsed time */
elapsed_time = buffer_ctl.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_STOP:
BSP_AUDIO_OUT_Stop(CODEC_PDWN_SW);
audio_state = AUDIO_STATE_IDLE;
error_state = AUDIO_ERROR_IO;
break;
case AUDIO_STATE_NEXT:
if (++file_pos >= MTP_GetWavObjectNumber())
{
file_pos = 0;
}
BSP_AUDIO_OUT_Stop(CODEC_PDWN_SW);
AUDIO_Start(file_pos);
break;
case AUDIO_STATE_PREVIOUS:
if (--file_pos < 0)
{
file_pos = MTP_GetWavObjectNumber() - 1;
}
BSP_AUDIO_OUT_Stop(CODEC_PDWN_SW);
AUDIO_Start(file_pos);
break;
case AUDIO_STATE_PAUSE:
BSP_LCD_DisplayStringAt(250, LINE(14), (uint8_t *) " [PAUSE]", LEFT_MODE);
BSP_AUDIO_OUT_Pause();
audio_state = AUDIO_STATE_WAIT;
break;
case AUDIO_STATE_RESUME:
BSP_LCD_DisplayStringAt(250, LINE(14), (uint8_t *) " [PLAY ]", LEFT_MODE);
BSP_AUDIO_OUT_Resume();
audio_state = AUDIO_STATE_PLAY;
break;
case AUDIO_STATE_VOLUME_UP:
if (uwVolume <= 90)
{
uwVolume += 10;
}
BSP_AUDIO_OUT_SetVolume(uwVolume);
audio_state = AUDIO_STATE_PLAY;
break;
case AUDIO_STATE_VOLUME_DOWN:
if (uwVolume >= 10)
{
uwVolume -= 10;
}
BSP_AUDIO_OUT_SetVolume(uwVolume);
audio_state = AUDIO_STATE_PLAY;
break;
case AUDIO_STATE_WAIT:
case AUDIO_STATE_CONFIG:
case AUDIO_STATE_IDLE:
case AUDIO_STATE_INIT:
default:
/* Do Nothing */
break;
}
return error_state;
}
/**
* @brief Stops Audio streaming.
* @param None
* @retval Audio error
*/
AUDIO_ErrorTypeDef AUDIO_Stop(void)
{
audio_state = AUDIO_STATE_STOP;
file_pos = 0;
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[FILE_NAME_SIZE + 26];
uint8_t fname[FILE_NAME_SIZE];
uint32_t bytesread;
uint32_t duration;
if (MTP_GetWavObjectName(file_idx, fname) == 0)
{
if (MTP_GetData(file_idx,
0,
sizeof(WAV_InfoTypedef),
(uint8_t *) & wav_info, &bytesread) == 0)
{
BSP_LCD_SetTextColor(LCD_COLOR_WHITE);
sprintf((char *)str, "Playing file (%d/%d): %s",
file_idx + 1, MTP_GetWavObjectNumber(), (char *)fname);
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;
}
}
return AUDIO_ERROR_IO;
}
/**
* @brief Calculates the remaining file size and new position of the pointer.
* @param None
* @retval None
*/
void BSP_AUDIO_OUT_TransferComplete_CallBack(void)
{
if (audio_state == AUDIO_STATE_PLAY)
{
buffer_ctl.offset = BUFFER_OFFSET_FULL;
BSP_AUDIO_OUT_ChangeBuffer((uint16_t *) & buffer_ctl.buff[0],
AUDIO_BUFFER_SIZE / 2);
}
}
/**
* @brief Manages the DMA Half Transfer complete interrupt.
* @param None
* @retval None
*/
void BSP_AUDIO_OUT_HalfTransfer_CallBack(void)
{
if (audio_state == AUDIO_STATE_PLAY)
{
buffer_ctl.offset = BUFFER_OFFSET_HALF;
BSP_AUDIO_OUT_ChangeBuffer((uint16_t *) & buffer_ctl.
buff[AUDIO_BUFFER_SIZE / 2],
AUDIO_BUFFER_SIZE / 2);
}
}
/**
* @brief Manages the DMA FIFO error interrupt.
* @param None
* @retval None
*/
void BSP_AUDIO_OUT_Error_CallBack(void)
{
}